cgltf.h

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/**
 * cgltf - a single-file glTF 2.0 parser written in C99.
 *
 * Version: 1.15
 *
 * Website: https://github.com/jkuhlmann/cgltf
 *
 * Distributed under the MIT License, see notice at the end of this file.
 *
 * Building:
 * Include this file where you need the struct and function
 * declarations. Have exactly one source file where you define
 * `CGLTF_IMPLEMENTATION` before including this file to get the
 * function definitions.
 *
 * Reference:
 * `cgltf_result cgltf_parse(const cgltf_options*, const void*,
 * cgltf_size, cgltf_data**)` parses both glTF and GLB data. If
 * this function returns `cgltf_result_success`, you have to call
 * `cgltf_free()` on the created `cgltf_data*` variable.
 * Note that contents of external files for buffers and images are not
 * automatically loaded. You'll need to read these files yourself using
 * URIs in the `cgltf_data` structure.
 *
 * `cgltf_options` is the struct passed to `cgltf_parse()` to control
 * parts of the parsing process. You can use it to force the file type
 * and provide memory allocation as well as file operation callbacks.
 * Should be zero-initialized to trigger default behavior.
 *
 * `cgltf_data` is the struct allocated and filled by `cgltf_parse()`.
 * It generally mirrors the glTF format as described by the spec (see
 * https://github.com/KhronosGroup/glTF/tree/master/specification/2.0).
 *
 * `void cgltf_free(cgltf_data*)` frees the allocated `cgltf_data`
 * variable.
 *
 * `cgltf_result cgltf_load_buffers(const cgltf_options*, cgltf_data*,
 * const char* gltf_path)` can be optionally called to open and read buffer
 * files using the `FILE*` APIs. The `gltf_path` argument is the path to
 * the original glTF file, which allows the parser to resolve the path to
 * buffer files.
 *
 * `cgltf_result cgltf_load_buffer_base64(const cgltf_options* options,
 * cgltf_size size, const char* base64, void** out_data)` decodes
 * base64-encoded data content. Used internally by `cgltf_load_buffers()`.
 * This is useful when decoding data URIs in images.
 *
 * `cgltf_result cgltf_parse_file(const cgltf_options* options, const
 * char* path, cgltf_data** out_data)` can be used to open the given
 * file using `FILE*` APIs and parse the data using `cgltf_parse()`.
 *
 * `cgltf_result cgltf_validate(cgltf_data*)` can be used to do additional
 * checks to make sure the parsed glTF data is valid.
 *
 * `cgltf_node_transform_local` converts the translation / rotation / scale properties of a node
 * into a mat4.
 *
 * `cgltf_node_transform_world` calls `cgltf_node_transform_local` on every ancestor in order
 * to compute the root-to-node transformation.
 *
 * `cgltf_accessor_unpack_floats` reads in the data from an accessor, applies sparse data (if any),
 * and converts them to floating point. Assumes that `cgltf_load_buffers` has already been called.
 * By passing null for the output pointer, users can find out how many floats are required in the
 * output buffer.
 *
 * `cgltf_accessor_unpack_indices` reads in the index data from an accessor. Assumes that
 * `cgltf_load_buffers` has already been called. By passing null for the output pointer, users can
 * find out how many indices are required in the output buffer. Returns 0 if the accessor is
 * sparse or if the output component size is less than the accessor's component size.
 *
 * `cgltf_num_components` is a tiny utility that tells you the dimensionality of
 * a certain accessor type. This can be used before `cgltf_accessor_unpack_floats` to help allocate
 * the necessary amount of memory. `cgltf_component_size` and `cgltf_calc_size` exist for
 * similar purposes.
 *
 * `cgltf_accessor_read_float` reads a certain element from a non-sparse accessor and converts it to
 * floating point, assuming that `cgltf_load_buffers` has already been called. The passed-in element
 * size is the number of floats in the output buffer, which should be in the range [1, 16]. Returns
 * false if the passed-in element_size is too small, or if the accessor is sparse.
 *
 * `cgltf_accessor_read_uint` is similar to its floating-point counterpart, but limited to reading
 * vector types and does not support matrix types. The passed-in element size is the number of uints
 * in the output buffer, which should be in the range [1, 4]. Returns false if the passed-in
 * element_size is too small, or if the accessor is sparse.
 *
 * `cgltf_accessor_read_index` is similar to its floating-point counterpart, but it returns size_t
 * and only works with single-component data types.
 *
 * `cgltf_copy_extras_json` allows users to retrieve the "extras" data that can be attached to many
 * glTF objects (which can be arbitrary JSON data). This is a legacy function, consider using
 * cgltf_extras::data directly instead. You can parse this data using your own JSON parser
 * or, if you've included the cgltf implementation using the integrated JSMN JSON parser.
 */
#ifndef CGLTF_H_INCLUDED__
#define CGLTF_H_INCLUDED__

#include <stddef.h>
#include <stdint.h> /* For uint8_t, uint32_t */

#ifdef __cplusplus
extern "C" {
#endif

typedef size_t cgltf_size;
typedef long long int cgltf_ssize;
typedef float cgltf_float;
typedef int cgltf_int;
typedef unsigned int cgltf_uint;
typedef int cgltf_bool;

typedef enum cgltf_file_type
{
        cgltf_file_type_invalid,
        cgltf_file_type_gltf,
        cgltf_file_type_glb,
        cgltf_file_type_max_enum
} cgltf_file_type;

typedef enum cgltf_result
{
        cgltf_result_success,
        cgltf_result_data_too_short,
        cgltf_result_unknown_format,
        cgltf_result_invalid_json,
        cgltf_result_invalid_gltf,
        cgltf_result_invalid_options,
        cgltf_result_file_not_found,
        cgltf_result_io_error,
        cgltf_result_out_of_memory,
        cgltf_result_legacy_gltf,
    cgltf_result_max_enum
} cgltf_result;

typedef struct cgltf_memory_options
{
        void* (*alloc_func)(void* user, cgltf_size size);
        void (*free_func) (void* user, void* ptr);
        void* user_data;
} cgltf_memory_options;

typedef struct cgltf_file_options
{
        cgltf_result(*read)(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, const char* path, cgltf_size* size, void** data);
        void (*release)(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, void* data, cgltf_size size);
        void* user_data;
} cgltf_file_options;

typedef struct cgltf_options
{
        cgltf_file_type type; /* invalid == auto detect */
        cgltf_size json_token_count; /* 0 == auto */
        cgltf_memory_options memory;
        cgltf_file_options file;
} cgltf_options;

typedef enum cgltf_buffer_view_type
{
        cgltf_buffer_view_type_invalid,
        cgltf_buffer_view_type_indices,
        cgltf_buffer_view_type_vertices,
        cgltf_buffer_view_type_max_enum
} cgltf_buffer_view_type;

typedef enum cgltf_attribute_type
{
        cgltf_attribute_type_invalid,
        cgltf_attribute_type_position,
        cgltf_attribute_type_normal,
        cgltf_attribute_type_tangent,
        cgltf_attribute_type_texcoord,
        cgltf_attribute_type_color,
        cgltf_attribute_type_joints,
        cgltf_attribute_type_weights,
        cgltf_attribute_type_custom,
        cgltf_attribute_type_max_enum
} cgltf_attribute_type;

typedef enum cgltf_component_type
{
        cgltf_component_type_invalid,
        cgltf_component_type_r_8, /* BYTE */
        cgltf_component_type_r_8u, /* UNSIGNED_BYTE */
        cgltf_component_type_r_16, /* SHORT */
        cgltf_component_type_r_16u, /* UNSIGNED_SHORT */
        cgltf_component_type_r_32u, /* UNSIGNED_INT */
        cgltf_component_type_r_32f, /* FLOAT */
    cgltf_component_type_max_enum
} cgltf_component_type;

typedef enum cgltf_type
{
        cgltf_type_invalid,
        cgltf_type_scalar,
        cgltf_type_vec2,
        cgltf_type_vec3,
        cgltf_type_vec4,
        cgltf_type_mat2,
        cgltf_type_mat3,
        cgltf_type_mat4,
        cgltf_type_max_enum
} cgltf_type;

typedef enum cgltf_primitive_type
{
        cgltf_primitive_type_invalid,
        cgltf_primitive_type_points,
        cgltf_primitive_type_lines,
        cgltf_primitive_type_line_loop,
        cgltf_primitive_type_line_strip,
        cgltf_primitive_type_triangles,
        cgltf_primitive_type_triangle_strip,
        cgltf_primitive_type_triangle_fan,
        cgltf_primitive_type_max_enum
} cgltf_primitive_type;

typedef enum cgltf_alpha_mode
{
        cgltf_alpha_mode_opaque,
        cgltf_alpha_mode_mask,
        cgltf_alpha_mode_blend,
        cgltf_alpha_mode_max_enum
} cgltf_alpha_mode;

typedef enum cgltf_animation_path_type {
        cgltf_animation_path_type_invalid,
        cgltf_animation_path_type_translation,
        cgltf_animation_path_type_rotation,
        cgltf_animation_path_type_scale,
        cgltf_animation_path_type_weights,
        cgltf_animation_path_type_max_enum
} cgltf_animation_path_type;

typedef enum cgltf_interpolation_type {
        cgltf_interpolation_type_linear,
        cgltf_interpolation_type_step,
        cgltf_interpolation_type_cubic_spline,
        cgltf_interpolation_type_max_enum
} cgltf_interpolation_type;

typedef enum cgltf_camera_type {
        cgltf_camera_type_invalid,
        cgltf_camera_type_perspective,
        cgltf_camera_type_orthographic,
        cgltf_camera_type_max_enum
} cgltf_camera_type;

typedef enum cgltf_light_type {
        cgltf_light_type_invalid,
        cgltf_light_type_directional,
        cgltf_light_type_point,
        cgltf_light_type_spot,
        cgltf_light_type_max_enum
} cgltf_light_type;

typedef enum cgltf_data_free_method {
        cgltf_data_free_method_none,
        cgltf_data_free_method_file_release,
        cgltf_data_free_method_memory_free,
        cgltf_data_free_method_max_enum
} cgltf_data_free_method;

typedef struct cgltf_extras {
        cgltf_size start_offset; /* this field is deprecated and will be removed in the future; use data instead */
        cgltf_size end_offset; /* this field is deprecated and will be removed in the future; use data instead */

        char* data;
} cgltf_extras;

typedef struct cgltf_extension {
        char* name;
        char* data;
} cgltf_extension;

typedef struct cgltf_buffer
{
        char* name;
        cgltf_size size;
        char* uri;
        void* data; /* loaded by cgltf_load_buffers */
        cgltf_data_free_method data_free_method;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_buffer;

typedef enum cgltf_meshopt_compression_mode {
        cgltf_meshopt_compression_mode_invalid,
        cgltf_meshopt_compression_mode_attributes,
        cgltf_meshopt_compression_mode_triangles,
        cgltf_meshopt_compression_mode_indices,
        cgltf_meshopt_compression_mode_max_enum
} cgltf_meshopt_compression_mode;

typedef enum cgltf_meshopt_compression_filter {
        cgltf_meshopt_compression_filter_none,
        cgltf_meshopt_compression_filter_octahedral,
        cgltf_meshopt_compression_filter_quaternion,
        cgltf_meshopt_compression_filter_exponential,
        cgltf_meshopt_compression_filter_color,
        cgltf_meshopt_compression_filter_max_enum
} cgltf_meshopt_compression_filter;

typedef struct cgltf_meshopt_compression
{
        cgltf_buffer* buffer;
        cgltf_size offset;
        cgltf_size size;
        cgltf_size stride;
        cgltf_size count;
        cgltf_meshopt_compression_mode mode;
        cgltf_meshopt_compression_filter filter;
        cgltf_bool is_khr;
} cgltf_meshopt_compression;

typedef struct cgltf_buffer_view
{
        char *name;
        cgltf_buffer* buffer;
        cgltf_size offset;
        cgltf_size size;
        cgltf_size stride; /* 0 == automatically determined by accessor */
        cgltf_buffer_view_type type;
        void* data; /* overrides buffer->data if present, filled by extensions */
        cgltf_bool has_meshopt_compression;
        cgltf_meshopt_compression meshopt_compression;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_buffer_view;

typedef struct cgltf_accessor_sparse
{
        cgltf_size count;
        cgltf_buffer_view* indices_buffer_view;
        cgltf_size indices_byte_offset;
        cgltf_component_type indices_component_type;
        cgltf_buffer_view* values_buffer_view;
        cgltf_size values_byte_offset;
} cgltf_accessor_sparse;

typedef struct cgltf_accessor
{
        char* name;
        cgltf_component_type component_type;
        cgltf_bool normalized;
        cgltf_type type;
        cgltf_size offset;
        cgltf_size count;
        cgltf_size stride;
        cgltf_buffer_view* buffer_view;
        cgltf_bool has_min;
        cgltf_float min[16];
        cgltf_bool has_max;
        cgltf_float max[16];
        cgltf_bool is_sparse;
        cgltf_accessor_sparse sparse;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_accessor;

typedef struct cgltf_attribute
{
        char* name;
        cgltf_attribute_type type;
        cgltf_int index;
        cgltf_accessor* data;
} cgltf_attribute;

typedef struct cgltf_image
{
        char* name;
        char* uri;
        cgltf_buffer_view* buffer_view;
        char* mime_type;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_image;

typedef enum cgltf_filter_type {
    cgltf_filter_type_undefined = 0,
    cgltf_filter_type_nearest = 9728,
    cgltf_filter_type_linear = 9729,
    cgltf_filter_type_nearest_mipmap_nearest = 9984,
    cgltf_filter_type_linear_mipmap_nearest = 9985,
    cgltf_filter_type_nearest_mipmap_linear = 9986,
    cgltf_filter_type_linear_mipmap_linear = 9987
} cgltf_filter_type;

typedef enum cgltf_wrap_mode {
    cgltf_wrap_mode_clamp_to_edge = 33071,
    cgltf_wrap_mode_mirrored_repeat = 33648,
    cgltf_wrap_mode_repeat = 10497
} cgltf_wrap_mode;

typedef struct cgltf_sampler
{
        char* name;
        cgltf_filter_type mag_filter;
        cgltf_filter_type min_filter;
        cgltf_wrap_mode wrap_s;
        cgltf_wrap_mode wrap_t;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_sampler;

typedef struct cgltf_texture
{
        char* name;
        cgltf_image* image;
        cgltf_sampler* sampler;
        cgltf_bool has_basisu;
        cgltf_image* basisu_image;
        cgltf_bool has_webp;
        cgltf_image* webp_image;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_texture;

typedef struct cgltf_texture_transform
{
        cgltf_float offset[2];
        cgltf_float rotation;
        cgltf_float scale[2];
        cgltf_bool has_texcoord;
        cgltf_int texcoord;
} cgltf_texture_transform;

typedef struct cgltf_texture_view
{
        cgltf_texture* texture;
        cgltf_int texcoord;
        cgltf_float scale; /* equivalent to strength for occlusion_texture */
        cgltf_bool has_transform;
        cgltf_texture_transform transform;
} cgltf_texture_view;

typedef struct cgltf_pbr_metallic_roughness
{
        cgltf_texture_view base_color_texture;
        cgltf_texture_view metallic_roughness_texture;

        cgltf_float base_color_factor[4];
        cgltf_float metallic_factor;
        cgltf_float roughness_factor;
} cgltf_pbr_metallic_roughness;

typedef struct cgltf_pbr_specular_glossiness
{
        cgltf_texture_view diffuse_texture;
        cgltf_texture_view specular_glossiness_texture;

        cgltf_float diffuse_factor[4];
        cgltf_float specular_factor[3];
        cgltf_float glossiness_factor;
} cgltf_pbr_specular_glossiness;

typedef struct cgltf_clearcoat
{
        cgltf_texture_view clearcoat_texture;
        cgltf_texture_view clearcoat_roughness_texture;
        cgltf_texture_view clearcoat_normal_texture;

        cgltf_float clearcoat_factor;
        cgltf_float clearcoat_roughness_factor;
} cgltf_clearcoat;

typedef struct cgltf_transmission
{
        cgltf_texture_view transmission_texture;
        cgltf_float transmission_factor;
} cgltf_transmission;

typedef struct cgltf_ior
{
        cgltf_float ior;
} cgltf_ior;

typedef struct cgltf_specular
{
        cgltf_texture_view specular_texture;
        cgltf_texture_view specular_color_texture;
        cgltf_float specular_color_factor[3];
        cgltf_float specular_factor;
} cgltf_specular;

typedef struct cgltf_volume
{
        cgltf_texture_view thickness_texture;
        cgltf_float thickness_factor;
        cgltf_float attenuation_color[3];
        cgltf_float attenuation_distance;
} cgltf_volume;

typedef struct cgltf_sheen
{
        cgltf_texture_view sheen_color_texture;
        cgltf_float sheen_color_factor[3];
        cgltf_texture_view sheen_roughness_texture;
        cgltf_float sheen_roughness_factor;
} cgltf_sheen;

typedef struct cgltf_emissive_strength
{
        cgltf_float emissive_strength;
} cgltf_emissive_strength;

typedef struct cgltf_iridescence
{
        cgltf_float iridescence_factor;
        cgltf_texture_view iridescence_texture;
        cgltf_float iridescence_ior;
        cgltf_float iridescence_thickness_min;
        cgltf_float iridescence_thickness_max;
        cgltf_texture_view iridescence_thickness_texture;
} cgltf_iridescence;

typedef struct cgltf_diffuse_transmission
{
        cgltf_texture_view diffuse_transmission_texture;
        cgltf_float diffuse_transmission_factor;
        cgltf_float diffuse_transmission_color_factor[3];
        cgltf_texture_view diffuse_transmission_color_texture;
} cgltf_diffuse_transmission;

typedef struct cgltf_anisotropy
{
        cgltf_float anisotropy_strength;
        cgltf_float anisotropy_rotation;
        cgltf_texture_view anisotropy_texture;
} cgltf_anisotropy;

typedef struct cgltf_dispersion
{
        cgltf_float dispersion;
} cgltf_dispersion;

typedef struct cgltf_material
{
        char* name;
        cgltf_bool has_pbr_metallic_roughness;
        cgltf_bool has_pbr_specular_glossiness;
        cgltf_bool has_clearcoat;
        cgltf_bool has_transmission;
        cgltf_bool has_volume;
        cgltf_bool has_ior;
        cgltf_bool has_specular;
        cgltf_bool has_sheen;
        cgltf_bool has_emissive_strength;
        cgltf_bool has_iridescence;
        cgltf_bool has_diffuse_transmission;
        cgltf_bool has_anisotropy;
        cgltf_bool has_dispersion;
        cgltf_pbr_metallic_roughness pbr_metallic_roughness;
        cgltf_pbr_specular_glossiness pbr_specular_glossiness;
        cgltf_clearcoat clearcoat;
        cgltf_ior ior;
        cgltf_specular specular;
        cgltf_sheen sheen;
        cgltf_transmission transmission;
        cgltf_volume volume;
        cgltf_emissive_strength emissive_strength;
        cgltf_iridescence iridescence;
        cgltf_diffuse_transmission diffuse_transmission;
        cgltf_anisotropy anisotropy;
        cgltf_dispersion dispersion;
        cgltf_texture_view normal_texture;
        cgltf_texture_view occlusion_texture;
        cgltf_texture_view emissive_texture;
        cgltf_float emissive_factor[3];
        cgltf_alpha_mode alpha_mode;
        cgltf_float alpha_cutoff;
        cgltf_bool double_sided;
        cgltf_bool unlit;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_material;

typedef struct cgltf_material_mapping
{
        cgltf_size variant;
        cgltf_material* material;
        cgltf_extras extras;
} cgltf_material_mapping;

typedef struct cgltf_morph_target {
        cgltf_attribute* attributes;
        cgltf_size attributes_count;
} cgltf_morph_target;

typedef struct cgltf_draco_mesh_compression {
        cgltf_buffer_view* buffer_view;
        cgltf_attribute* attributes;
        cgltf_size attributes_count;
} cgltf_draco_mesh_compression;

typedef struct cgltf_mesh_gpu_instancing {
        cgltf_attribute* attributes;
        cgltf_size attributes_count;
} cgltf_mesh_gpu_instancing;

typedef struct cgltf_primitive {
        cgltf_primitive_type type;
        cgltf_accessor* indices;
        cgltf_material* material;
        cgltf_attribute* attributes;
        cgltf_size attributes_count;
        cgltf_morph_target* targets;
        cgltf_size targets_count;
        cgltf_extras extras;
        cgltf_bool has_draco_mesh_compression;
        cgltf_draco_mesh_compression draco_mesh_compression;
        cgltf_material_mapping* mappings;
        cgltf_size mappings_count;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_primitive;

typedef struct cgltf_mesh {
        char* name;
        cgltf_primitive* primitives;
        cgltf_size primitives_count;
        cgltf_float* weights;
        cgltf_size weights_count;
        char** target_names;
        cgltf_size target_names_count;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_mesh;

typedef struct cgltf_node cgltf_node;

typedef struct cgltf_skin {
        char* name;
        cgltf_node** joints;
        cgltf_size joints_count;
        cgltf_node* skeleton;
        cgltf_accessor* inverse_bind_matrices;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_skin;

typedef struct cgltf_camera_perspective {
        cgltf_bool has_aspect_ratio;
        cgltf_float aspect_ratio;
        cgltf_float yfov;
        cgltf_bool has_zfar;
        cgltf_float zfar;
        cgltf_float znear;
        cgltf_extras extras;
} cgltf_camera_perspective;

typedef struct cgltf_camera_orthographic {
        cgltf_float xmag;
        cgltf_float ymag;
        cgltf_float zfar;
        cgltf_float znear;
        cgltf_extras extras;
} cgltf_camera_orthographic;

typedef struct cgltf_camera {
        char* name;
        cgltf_camera_type type;
        union {
                cgltf_camera_perspective perspective;
                cgltf_camera_orthographic orthographic;
        } data;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_camera;

typedef struct cgltf_light {
        char* name;
        cgltf_float color[3];
        cgltf_float intensity;
        cgltf_light_type type;
        cgltf_float range;
        cgltf_float spot_inner_cone_angle;
        cgltf_float spot_outer_cone_angle;
        cgltf_extras extras;
} cgltf_light;

struct cgltf_node {
        char* name;
        cgltf_node* parent;
        cgltf_node** children;
        cgltf_size children_count;
        cgltf_skin* skin;
        cgltf_mesh* mesh;
        cgltf_camera* camera;
        cgltf_light* light;
        cgltf_float* weights;
        cgltf_size weights_count;
        cgltf_bool has_translation;
        cgltf_bool has_rotation;
        cgltf_bool has_scale;
        cgltf_bool has_matrix;
        cgltf_float translation[3];
        cgltf_float rotation[4];
        cgltf_float scale[3];
        cgltf_float matrix[16];
        cgltf_extras extras;
        cgltf_bool has_mesh_gpu_instancing;
        cgltf_mesh_gpu_instancing mesh_gpu_instancing;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
};

typedef struct cgltf_scene {
        char* name;
        cgltf_node** nodes;
        cgltf_size nodes_count;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_scene;

typedef struct cgltf_animation_sampler {
        cgltf_accessor* input;
        cgltf_accessor* output;
        cgltf_interpolation_type interpolation;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_animation_sampler;

typedef struct cgltf_animation_channel {
        cgltf_animation_sampler* sampler;
        cgltf_node* target_node;
        cgltf_animation_path_type target_path;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_animation_channel;

typedef struct cgltf_animation {
        char* name;
        cgltf_animation_sampler* samplers;
        cgltf_size samplers_count;
        cgltf_animation_channel* channels;
        cgltf_size channels_count;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_animation;

typedef struct cgltf_material_variant
{
        char* name;
        cgltf_extras extras;
} cgltf_material_variant;

typedef struct cgltf_asset {
        char* copyright;
        char* generator;
        char* version;
        char* min_version;
        cgltf_extras extras;
        cgltf_size extensions_count;
        cgltf_extension* extensions;
} cgltf_asset;

typedef struct cgltf_data
{
        cgltf_file_type file_type;
        void* file_data;
        cgltf_size file_size;

        cgltf_asset asset;

        cgltf_mesh* meshes;
        cgltf_size meshes_count;

        cgltf_material* materials;
        cgltf_size materials_count;

        cgltf_accessor* accessors;
        cgltf_size accessors_count;

        cgltf_buffer_view* buffer_views;
        cgltf_size buffer_views_count;

        cgltf_buffer* buffers;
        cgltf_size buffers_count;

        cgltf_image* images;
        cgltf_size images_count;

        cgltf_texture* textures;
        cgltf_size textures_count;

        cgltf_sampler* samplers;
        cgltf_size samplers_count;

        cgltf_skin* skins;
        cgltf_size skins_count;

        cgltf_camera* cameras;
        cgltf_size cameras_count;

        cgltf_light* lights;
        cgltf_size lights_count;

        cgltf_node* nodes;
        cgltf_size nodes_count;

        cgltf_scene* scenes;
        cgltf_size scenes_count;

        cgltf_scene* scene;

        cgltf_animation* animations;
        cgltf_size animations_count;

        cgltf_material_variant* variants;
        cgltf_size variants_count;

        cgltf_extras extras;

        cgltf_size data_extensions_count;
        cgltf_extension* data_extensions;

        char** extensions_used;
        cgltf_size extensions_used_count;

        char** extensions_required;
        cgltf_size extensions_required_count;

        const char* json;
        cgltf_size json_size;

        const void* bin;
        cgltf_size bin_size;

        cgltf_memory_options memory;
        cgltf_file_options file;
} cgltf_data;

cgltf_result cgltf_parse(
                const cgltf_options* options,
                const void* data,
                cgltf_size size,
                cgltf_data** out_data);

cgltf_result cgltf_parse_file(
                const cgltf_options* options,
                const char* path,
                cgltf_data** out_data);

cgltf_result cgltf_load_buffers(
                const cgltf_options* options,
                cgltf_data* data,
                const char* gltf_path);

cgltf_result cgltf_load_buffer_base64(const cgltf_options* options, cgltf_size size, const char* base64, void** out_data);

cgltf_size cgltf_decode_string(char* string);
cgltf_size cgltf_decode_uri(char* uri);

cgltf_result cgltf_validate(cgltf_data* data);

void cgltf_free(cgltf_data* data);

void cgltf_node_transform_local(const cgltf_node* node, cgltf_float* out_matrix);
void cgltf_node_transform_world(const cgltf_node* node, cgltf_float* out_matrix);

const uint8_t* cgltf_buffer_view_data(const cgltf_buffer_view* view);

const cgltf_accessor* cgltf_find_accessor(const cgltf_primitive* prim, cgltf_attribute_type type, cgltf_int index);

cgltf_bool cgltf_accessor_read_float(const cgltf_accessor* accessor, cgltf_size index, cgltf_float* out, cgltf_size element_size);
cgltf_bool cgltf_accessor_read_uint(const cgltf_accessor* accessor, cgltf_size index, cgltf_uint* out, cgltf_size element_size);
cgltf_size cgltf_accessor_read_index(const cgltf_accessor* accessor, cgltf_size index);

cgltf_size cgltf_num_components(cgltf_type type);
cgltf_size cgltf_component_size(cgltf_component_type component_type);
cgltf_size cgltf_calc_size(cgltf_type type, cgltf_component_type component_type);

cgltf_size cgltf_accessor_unpack_floats(const cgltf_accessor* accessor, cgltf_float* out, cgltf_size float_count);
cgltf_size cgltf_accessor_unpack_indices(const cgltf_accessor* accessor, void* out, cgltf_size out_component_size, cgltf_size index_count);

/* this function is deprecated and will be removed in the future; use cgltf_extras::data instead */
cgltf_result cgltf_copy_extras_json(const cgltf_data* data, const cgltf_extras* extras, char* dest, cgltf_size* dest_size);

cgltf_size cgltf_mesh_index(const cgltf_data* data, const cgltf_mesh* object);
cgltf_size cgltf_material_index(const cgltf_data* data, const cgltf_material* object);
cgltf_size cgltf_accessor_index(const cgltf_data* data, const cgltf_accessor* object);
cgltf_size cgltf_buffer_view_index(const cgltf_data* data, const cgltf_buffer_view* object);
cgltf_size cgltf_buffer_index(const cgltf_data* data, const cgltf_buffer* object);
cgltf_size cgltf_image_index(const cgltf_data* data, const cgltf_image* object);
cgltf_size cgltf_texture_index(const cgltf_data* data, const cgltf_texture* object);
cgltf_size cgltf_sampler_index(const cgltf_data* data, const cgltf_sampler* object);
cgltf_size cgltf_skin_index(const cgltf_data* data, const cgltf_skin* object);
cgltf_size cgltf_camera_index(const cgltf_data* data, const cgltf_camera* object);
cgltf_size cgltf_light_index(const cgltf_data* data, const cgltf_light* object);
cgltf_size cgltf_node_index(const cgltf_data* data, const cgltf_node* object);
cgltf_size cgltf_scene_index(const cgltf_data* data, const cgltf_scene* object);
cgltf_size cgltf_animation_index(const cgltf_data* data, const cgltf_animation* object);
cgltf_size cgltf_animation_sampler_index(const cgltf_animation* animation, const cgltf_animation_sampler* object);
cgltf_size cgltf_animation_channel_index(const cgltf_animation* animation, const cgltf_animation_channel* object);

#ifdef __cplusplus
}
#endif

#endif /* #ifndef CGLTF_H_INCLUDED__ */

/*
 *
 * Stop now, if you are only interested in the API.
 * Below, you find the implementation.
 *
 */

#if defined(__INTELLISENSE__) || defined(__JETBRAINS_IDE__)
/* This makes MSVC/CLion intellisense work. */
#define CGLTF_IMPLEMENTATION
#endif

#ifdef CGLTF_IMPLEMENTATION

#include <assert.h> /* For assert */
#include <string.h> /* For strncpy */
#include <stdio.h>  /* For fopen */
#include <limits.h> /* For UINT_MAX etc */
#include <float.h>  /* For FLT_MAX */

#if !defined(CGLTF_MALLOC) || !defined(CGLTF_FREE) || !defined(CGLTF_ATOI) || !defined(CGLTF_ATOF) || !defined(CGLTF_ATOLL)
#include <stdlib.h> /* For malloc, free, atoi, atof */
#endif

/* JSMN_PARENT_LINKS is necessary to make parsing large structures linear in input size */
#define JSMN_PARENT_LINKS

/* JSMN_STRICT is necessary to reject invalid JSON documents */
#define JSMN_STRICT

/*
 * -- jsmn.h start --
 * Source: https://github.com/zserge/jsmn
 * License: MIT
 */
typedef enum {
        JSMN_UNDEFINED = 0,
        JSMN_OBJECT = 1,
        JSMN_ARRAY = 2,
        JSMN_STRING = 3,
        JSMN_PRIMITIVE = 4
} jsmntype_t;
enum jsmnerr {
        /* Not enough tokens were provided */
        JSMN_ERROR_NOMEM = -1,
        /* Invalid character inside JSON string */
        JSMN_ERROR_INVAL = -2,
        /* The string is not a full JSON packet, more bytes expected */
        JSMN_ERROR_PART = -3
};
typedef struct {
        jsmntype_t type;
        ptrdiff_t start;
        ptrdiff_t end;
        int size;
#ifdef JSMN_PARENT_LINKS
        int parent;
#endif
} jsmntok_t;
typedef struct {
        size_t pos; /* offset in the JSON string */
        unsigned int toknext; /* next token to allocate */
        int toksuper; /* superior token node, e.g parent object or array */
} jsmn_parser;
static void jsmn_init(jsmn_parser *parser);
static int jsmn_parse(jsmn_parser *parser, const char *js, size_t len, jsmntok_t *tokens, size_t num_tokens);
/*
 * -- jsmn.h end --
 */


#ifndef CGLTF_CONSTS
#define GlbHeaderSize 12
#define GlbChunkHeaderSize 8
static const uint32_t GlbVersion = 2;
static const uint32_t GlbMagic = 0x46546C67;
static const uint32_t GlbMagicJsonChunk = 0x4E4F534A;
static const uint32_t GlbMagicBinChunk = 0x004E4942;
#define CGLTF_CONSTS
#endif

#ifndef CGLTF_MALLOC
#define CGLTF_MALLOC(size) malloc(size)
#endif
#ifndef CGLTF_FREE
#define CGLTF_FREE(ptr) free(ptr)
#endif
#ifndef CGLTF_ATOI
#define CGLTF_ATOI(str) atoi(str)
#endif
#ifndef CGLTF_ATOF
#define CGLTF_ATOF(str) atof(str)
#endif
#ifndef CGLTF_ATOLL
#define CGLTF_ATOLL(str) atoll(str)
#endif
#ifndef CGLTF_VALIDATE_ENABLE_ASSERTS
#define CGLTF_VALIDATE_ENABLE_ASSERTS 0
#endif

static void* cgltf_default_alloc(void* user, cgltf_size size)
{
        (void)user;
        return CGLTF_MALLOC(size);
}

static void cgltf_default_free(void* user, void* ptr)
{
        (void)user;
        CGLTF_FREE(ptr);
}

static void* cgltf_calloc(cgltf_options* options, size_t element_size, cgltf_size count)
{
        if (SIZE_MAX / element_size < count)
        {
                return NULL;
        }
        void* result = options->memory.alloc_func(options->memory.user_data, element_size * count);
        if (!result)
        {
                return NULL;
        }
        memset(result, 0, element_size * count);
        return result;
}

static cgltf_result cgltf_default_file_read(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, const char* path, cgltf_size* size, void** data)
{
        (void)file_options;
        void* (*memory_alloc)(void*, cgltf_size) = memory_options->alloc_func ? memory_options->alloc_func : &cgltf_default_alloc;
        void (*memory_free)(void*, void*) = memory_options->free_func ? memory_options->free_func : &cgltf_default_free;

        FILE* file = fopen(path, "rb");
        if (!file)
        {
                return cgltf_result_file_not_found;
        }

        cgltf_size file_size = size ? *size : 0;

        if (file_size == 0)
        {
                fseek(file, 0, SEEK_END);

#ifdef _MSC_VER
                __int64 length = _ftelli64(file);
#else
                long length = ftell(file);
#endif

                if (length < 0)
                {
                        fclose(file);
                        return cgltf_result_io_error;
                }

                fseek(file, 0, SEEK_SET);
                file_size = (cgltf_size)length;
        }

        char* file_data = (char*)memory_alloc(memory_options->user_data, file_size);
        if (!file_data)
        {
                fclose(file);
                return cgltf_result_out_of_memory;
        }

        cgltf_size read_size = fread(file_data, 1, file_size, file);

        fclose(file);

        if (read_size != file_size)
        {
                memory_free(memory_options->user_data, file_data);
                return cgltf_result_io_error;
        }

        if (size)
        {
                *size = file_size;
        }
        if (data)
        {
                *data = file_data;
        }

        return cgltf_result_success;
}

static void cgltf_default_file_release(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, void* data, cgltf_size size)
{
        (void)file_options;
        (void)size;
        void (*memfree)(void*, void*) = memory_options->free_func ? memory_options->free_func : &cgltf_default_free;
        memfree(memory_options->user_data, data);
}

static cgltf_result cgltf_parse_json(cgltf_options* options, const uint8_t* json_chunk, cgltf_size size, cgltf_data** out_data);

cgltf_result cgltf_parse(const cgltf_options* options, const void* data, cgltf_size size, cgltf_data** out_data)
{
        if (size < GlbHeaderSize)
        {
                return cgltf_result_data_too_short;
        }

        if (options == NULL)
        {
                return cgltf_result_invalid_options;
        }

        cgltf_options fixed_options = *options;
        if (fixed_options.memory.alloc_func == NULL)
        {
                fixed_options.memory.alloc_func = &cgltf_default_alloc;
        }
        if (fixed_options.memory.free_func == NULL)
        {
                fixed_options.memory.free_func = &cgltf_default_free;
        }

        uint32_t tmp;
        // Magic
        memcpy(&tmp, data, 4);
        if (tmp != GlbMagic)
        {
                if (fixed_options.type == cgltf_file_type_invalid)
                {
                        fixed_options.type = cgltf_file_type_gltf;
                }
                else if (fixed_options.type == cgltf_file_type_glb)
                {
                        return cgltf_result_unknown_format;
                }
        }

        if (fixed_options.type == cgltf_file_type_gltf)
        {
                cgltf_result json_result = cgltf_parse_json(&fixed_options, (const uint8_t*)data, size, out_data);
                if (json_result != cgltf_result_success)
                {
                        return json_result;
                }

                (*out_data)->file_type = cgltf_file_type_gltf;

                return cgltf_result_success;
        }

        const uint8_t* ptr = (const uint8_t*)data;
        // Version
        memcpy(&tmp, ptr + 4, 4);
        uint32_t version = tmp;
        if (version != GlbVersion)
        {
                return version < GlbVersion ? cgltf_result_legacy_gltf : cgltf_result_unknown_format;
        }

        // Total length
        memcpy(&tmp, ptr + 8, 4);
        if (tmp > size)
        {
                return cgltf_result_data_too_short;
        }

        const uint8_t* json_chunk = ptr + GlbHeaderSize;

        if (GlbHeaderSize + GlbChunkHeaderSize > size)
        {
                return cgltf_result_data_too_short;
        }

        // JSON chunk: length
        uint32_t json_length;
        memcpy(&json_length, json_chunk, 4);
        if (json_length > size - GlbHeaderSize - GlbChunkHeaderSize)
        {
                return cgltf_result_data_too_short;
        }

        // JSON chunk: magic
        memcpy(&tmp, json_chunk + 4, 4);
        if (tmp != GlbMagicJsonChunk)
        {
                return cgltf_result_unknown_format;
        }

        json_chunk += GlbChunkHeaderSize;

        const void* bin = NULL;
        cgltf_size bin_size = 0;

        if (GlbChunkHeaderSize <= size - GlbHeaderSize - GlbChunkHeaderSize - json_length)
        {
                // We can read another chunk
                const uint8_t* bin_chunk = json_chunk + json_length;

                // Bin chunk: length
                uint32_t bin_length;
                memcpy(&bin_length, bin_chunk, 4);
                if (bin_length > size - GlbHeaderSize - GlbChunkHeaderSize - json_length - GlbChunkHeaderSize)
                {
                        return cgltf_result_data_too_short;
                }

                // Bin chunk: magic
                memcpy(&tmp, bin_chunk + 4, 4);
                if (tmp != GlbMagicBinChunk)
                {
                        return cgltf_result_unknown_format;
                }

                bin_chunk += GlbChunkHeaderSize;

                bin = bin_chunk;
                bin_size = bin_length;
        }

        cgltf_result json_result = cgltf_parse_json(&fixed_options, json_chunk, json_length, out_data);
        if (json_result != cgltf_result_success)
        {
                return json_result;
        }

        (*out_data)->file_type = cgltf_file_type_glb;
        (*out_data)->bin = bin;
        (*out_data)->bin_size = bin_size;

        return cgltf_result_success;
}

cgltf_result cgltf_parse_file(const cgltf_options* options, const char* path, cgltf_data** out_data)
{
        if (options == NULL)
        {
                return cgltf_result_invalid_options;
        }

        cgltf_result (*file_read)(const struct cgltf_memory_options*, const struct cgltf_file_options*, const char*, cgltf_size*, void**) = options->file.read ? options->file.read : &cgltf_default_file_read;
        void (*file_release)(const struct cgltf_memory_options*, const struct cgltf_file_options*, void* data, cgltf_size size) = options->file.release ? options->file.release : cgltf_default_file_release;

        void* file_data = NULL;
        cgltf_size file_size = 0;
        cgltf_result result = file_read(&options->memory, &options->file, path, &file_size, &file_data);
        if (result != cgltf_result_success)
        {
                return result;
        }

        result = cgltf_parse(options, file_data, file_size, out_data);

        if (result != cgltf_result_success)
        {
                file_release(&options->memory, &options->file, file_data, file_size);
                return result;
        }

        (*out_data)->file_data = file_data;
        (*out_data)->file_size = file_size;

        return cgltf_result_success;
}

static void cgltf_combine_paths(char* path, const char* base, const char* uri)
{
        const char* s0 = strrchr(base, '/');
        const char* s1 = strrchr(base, '\\');
        const char* slash = s0 ? (s1 && s1 > s0 ? s1 : s0) : s1;

        if (slash)
        {
                size_t prefix = slash - base + 1;

                strncpy(path, base, prefix);
                strcpy(path + prefix, uri);
        }
        else
        {
                strcpy(path, uri);
        }
}

static cgltf_result cgltf_load_buffer_file(const cgltf_options* options, cgltf_size size, const char* uri, const char* gltf_path, void** out_data)
{
        void* (*memory_alloc)(void*, cgltf_size) = options->memory.alloc_func ? options->memory.alloc_func : &cgltf_default_alloc;
        void (*memory_free)(void*, void*) = options->memory.free_func ? options->memory.free_func : &cgltf_default_free;
        cgltf_result (*file_read)(const struct cgltf_memory_options*, const struct cgltf_file_options*, const char*, cgltf_size*, void**) = options->file.read ? options->file.read : &cgltf_default_file_read;

        char* path = (char*)memory_alloc(options->memory.user_data, strlen(uri) + strlen(gltf_path) + 1);
        if (!path)
        {
                return cgltf_result_out_of_memory;
        }

        cgltf_combine_paths(path, gltf_path, uri);

        // after combining, the tail of the resulting path is a uri; decode_uri converts it into path
        cgltf_decode_uri(path + strlen(path) - strlen(uri));

        void* file_data = NULL;
        cgltf_result result = file_read(&options->memory, &options->file, path, &size, &file_data);

        memory_free(options->memory.user_data, path);

        *out_data = (result == cgltf_result_success) ? file_data : NULL;

        return result;
}

cgltf_result cgltf_load_buffer_base64(const cgltf_options* options, cgltf_size size, const char* base64, void** out_data)
{
        void* (*memory_alloc)(void*, cgltf_size) = options->memory.alloc_func ? options->memory.alloc_func : &cgltf_default_alloc;
        void (*memory_free)(void*, void*) = options->memory.free_func ? options->memory.free_func : &cgltf_default_free;

        unsigned char* data = (unsigned char*)memory_alloc(options->memory.user_data, size);
        if (!data)
        {
                return cgltf_result_out_of_memory;
        }

        unsigned int buffer = 0;
        unsigned int buffer_bits = 0;

        for (cgltf_size i = 0; i < size; ++i)
        {
                while (buffer_bits < 8)
                {
                        char ch = *base64++;

                        int index =
                                (unsigned)(ch - 'A') < 26 ? (ch - 'A') :
                                (unsigned)(ch - 'a') < 26 ? (ch - 'a') + 26 :
                                (unsigned)(ch - '0') < 10 ? (ch - '0') + 52 :
                                ch == '+' ? 62 :
                                ch == '/' ? 63 :
                                -1;

                        if (index < 0)
                        {
                                memory_free(options->memory.user_data, data);
                                return cgltf_result_io_error;
                        }

                        buffer = (buffer << 6) | index;
                        buffer_bits += 6;
                }

                data[i] = (unsigned char)(buffer >> (buffer_bits - 8));
                buffer_bits -= 8;
        }

        *out_data = data;

        return cgltf_result_success;
}

static int cgltf_unhex(char ch)
{
        return
                (unsigned)(ch - '0') < 10 ? (ch - '0') :
                (unsigned)(ch - 'A') < 6 ? (ch - 'A') + 10 :
                (unsigned)(ch - 'a') < 6 ? (ch - 'a') + 10 :
                -1;
}

cgltf_size cgltf_decode_string(char* string)
{
        char* read = string + strcspn(string, "\\");
        if (*read == 0)
        {
                return read - string;
        }
        char* write = string;
        char* last = string;

        for (;;)
        {
                // Copy characters since last escaped sequence
                cgltf_size written = read - last;
                memmove(write, last, written);
                write += written;

                if (*read++ == 0)
                {
                        break;
                }

                // jsmn already checked that all escape sequences are valid
                switch (*read++)
                {
                case '\"': *write++ = '\"'; break;
                case '/':  *write++ = '/';  break;
                case '\\': *write++ = '\\'; break;
                case 'b':  *write++ = '\b'; break;
                case 'f':  *write++ = '\f'; break;
                case 'r':  *write++ = '\r'; break;
                case 'n':  *write++ = '\n'; break;
                case 't':  *write++ = '\t'; break;
                case 'u':
                {
                        // UCS-2 codepoint \uXXXX to UTF-8
                        int character = 0;
                        for (cgltf_size i = 0; i < 4; ++i)
                        {
                                character = (character << 4) + cgltf_unhex(*read++);
                        }

                        if (character <= 0x7F)
                        {
                                *write++ = character & 0xFF;
                        }
                        else if (character <= 0x7FF)
                        {
                                *write++ = 0xC0 | ((character >> 6) & 0xFF);
                                *write++ = 0x80 | (character & 0x3F);
                        }
                        else
                        {
                                *write++ = 0xE0 | ((character >> 12) & 0xFF);
                                *write++ = 0x80 | ((character >> 6) & 0x3F);
                                *write++ = 0x80 | (character & 0x3F);
                        }
                        break;
                }
                default:
                        break;
                }

                last = read;
                read += strcspn(read, "\\");
        }

        *write = 0;
        return write - string;
}

cgltf_size cgltf_decode_uri(char* uri)
{
        char* write = uri;
        char* i = uri;

        while (*i)
        {
                if (*i == '%')
                {
                        int ch1 = cgltf_unhex(i[1]);

                        if (ch1 >= 0)
                        {
                                int ch2 = cgltf_unhex(i[2]);

                                if (ch2 >= 0)
                                {
                                        *write++ = (char)(ch1 * 16 + ch2);
                                        i += 3;
                                        continue;
                                }
                        }
                }

                *write++ = *i++;
        }

        *write = 0;
        return write - uri;
}

cgltf_result cgltf_load_buffers(const cgltf_options* options, cgltf_data* data, const char* gltf_path)
{
        if (options == NULL)
        {
                return cgltf_result_invalid_options;
        }

        if (data->buffers_count && data->buffers[0].data == NULL && data->buffers[0].uri == NULL && data->bin)
        {
                if (data->bin_size < data->buffers[0].size)
                {
                        return cgltf_result_data_too_short;
                }

                data->buffers[0].data = (void*)data->bin;
                data->buffers[0].data_free_method = cgltf_data_free_method_none;
        }

        for (cgltf_size i = 0; i < data->buffers_count; ++i)
        {
                if (data->buffers[i].data)
                {
                        continue;
                }

                const char* uri = data->buffers[i].uri;

                if (uri == NULL)
                {
                        continue;
                }

                if (strncmp(uri, "data:", 5) == 0)
                {
                        const char* comma = strchr(uri, ',');

                        if (comma && comma - uri >= 7 && strncmp(comma - 7, ";base64", 7) == 0)
                        {
                                cgltf_result res = cgltf_load_buffer_base64(options, data->buffers[i].size, comma + 1, &data->buffers[i].data);
                                data->buffers[i].data_free_method = cgltf_data_free_method_memory_free;

                                if (res != cgltf_result_success)
                                {
                                        return res;
                                }
                        }
                        else
                        {
                                return cgltf_result_unknown_format;
                        }
                }
                else if (strstr(uri, "://") == NULL && gltf_path)
                {
                        cgltf_result res = cgltf_load_buffer_file(options, data->buffers[i].size, uri, gltf_path, &data->buffers[i].data);
                        data->buffers[i].data_free_method = cgltf_data_free_method_file_release;

                        if (res != cgltf_result_success)
                        {
                                return res;
                        }
                }
                else
                {
                        return cgltf_result_unknown_format;
                }
        }

        return cgltf_result_success;
}

static cgltf_size cgltf_calc_index_bound(cgltf_buffer_view* buffer_view, cgltf_size offset, cgltf_component_type component_type, cgltf_size count)
{
        char* data = (char*)buffer_view->buffer->data + offset + buffer_view->offset;
        cgltf_size bound = 0;

        switch (component_type)
        {
        case cgltf_component_type_r_8u:
                for (size_t i = 0; i < count; ++i)
                {
                        cgltf_size v = ((unsigned char*)data)[i];
                        bound = bound > v ? bound : v;
                }
                break;

        case cgltf_component_type_r_16u:
                for (size_t i = 0; i < count; ++i)
                {
                        cgltf_size v = ((unsigned short*)data)[i];
                        bound = bound > v ? bound : v;
                }
                break;

        case cgltf_component_type_r_32u:
                for (size_t i = 0; i < count; ++i)
                {
                        cgltf_size v = ((unsigned int*)data)[i];
                        bound = bound > v ? bound : v;
                }
                break;

        default:
                ;
        }

        return bound;
}

#if CGLTF_VALIDATE_ENABLE_ASSERTS
#define CGLTF_ASSERT_IF(cond, result) assert(!(cond)); if (cond) return result;
#else
#define CGLTF_ASSERT_IF(cond, result) if (cond) return result;
#endif

cgltf_result cgltf_validate(cgltf_data* data)
{
        for (cgltf_size i = 0; i < data->accessors_count; ++i)
        {
                cgltf_accessor* accessor = &data->accessors[i];

                CGLTF_ASSERT_IF(data->accessors[i].component_type == cgltf_component_type_invalid, cgltf_result_invalid_gltf);
                CGLTF_ASSERT_IF(data->accessors[i].type == cgltf_type_invalid, cgltf_result_invalid_gltf);

                cgltf_size element_size = cgltf_calc_size(accessor->type, accessor->component_type);

                if (accessor->buffer_view)
                {
                        cgltf_size req_size = accessor->offset + accessor->stride * (accessor->count - 1) + element_size;

                        CGLTF_ASSERT_IF(accessor->buffer_view->size < req_size, cgltf_result_data_too_short);
                }

                if (accessor->is_sparse)
                {
                        cgltf_accessor_sparse* sparse = &accessor->sparse;

                        cgltf_size indices_component_size = cgltf_component_size(sparse->indices_component_type);
                        cgltf_size indices_req_size = sparse->indices_byte_offset + indices_component_size * sparse->count;
                        cgltf_size values_req_size = sparse->values_byte_offset + element_size * sparse->count;

                        CGLTF_ASSERT_IF(sparse->indices_buffer_view->size < indices_req_size ||
                                                        sparse->values_buffer_view->size < values_req_size, cgltf_result_data_too_short);

                        CGLTF_ASSERT_IF(sparse->indices_component_type != cgltf_component_type_r_8u &&
                                                        sparse->indices_component_type != cgltf_component_type_r_16u &&
                                                        sparse->indices_component_type != cgltf_component_type_r_32u, cgltf_result_invalid_gltf);

                        if (sparse->indices_buffer_view->buffer->data)
                        {
                                cgltf_size index_bound = cgltf_calc_index_bound(sparse->indices_buffer_view, sparse->indices_byte_offset, sparse->indices_component_type, sparse->count);

                                CGLTF_ASSERT_IF(index_bound >= accessor->count, cgltf_result_data_too_short);
                        }
                }
        }

        for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
        {
                cgltf_size req_size = data->buffer_views[i].offset + data->buffer_views[i].size;

                CGLTF_ASSERT_IF(data->buffer_views[i].buffer && data->buffer_views[i].buffer->size < req_size, cgltf_result_data_too_short);

                if (data->buffer_views[i].has_meshopt_compression)
                {
                        cgltf_meshopt_compression* mc = &data->buffer_views[i].meshopt_compression;

                        CGLTF_ASSERT_IF(mc->buffer == NULL || mc->buffer->size < mc->offset + mc->size, cgltf_result_data_too_short);

                        CGLTF_ASSERT_IF(data->buffer_views[i].stride && mc->stride != data->buffer_views[i].stride, cgltf_result_invalid_gltf);

                        CGLTF_ASSERT_IF(data->buffer_views[i].size != mc->stride * mc->count, cgltf_result_invalid_gltf);

                        CGLTF_ASSERT_IF(mc->mode == cgltf_meshopt_compression_mode_invalid, cgltf_result_invalid_gltf);

                        CGLTF_ASSERT_IF(mc->mode == cgltf_meshopt_compression_mode_attributes && !(mc->stride % 4 == 0 && mc->stride <= 256), cgltf_result_invalid_gltf);

                        CGLTF_ASSERT_IF(mc->mode == cgltf_meshopt_compression_mode_triangles && mc->count % 3 != 0, cgltf_result_invalid_gltf);

                        CGLTF_ASSERT_IF((mc->mode == cgltf_meshopt_compression_mode_triangles || mc->mode == cgltf_meshopt_compression_mode_indices) && mc->stride != 2 && mc->stride != 4, cgltf_result_invalid_gltf);

                        CGLTF_ASSERT_IF((mc->mode == cgltf_meshopt_compression_mode_triangles || mc->mode == cgltf_meshopt_compression_mode_indices) && mc->filter != cgltf_meshopt_compression_filter_none, cgltf_result_invalid_gltf);

                        CGLTF_ASSERT_IF(mc->filter == cgltf_meshopt_compression_filter_octahedral && mc->stride != 4 && mc->stride != 8, cgltf_result_invalid_gltf);
                        CGLTF_ASSERT_IF(mc->filter == cgltf_meshopt_compression_filter_quaternion && mc->stride != 8, cgltf_result_invalid_gltf);
                        CGLTF_ASSERT_IF(mc->filter == cgltf_meshopt_compression_filter_color && mc->stride != 4 && mc->stride != 8, cgltf_result_invalid_gltf);
                }
        }

        for (cgltf_size i = 0; i < data->meshes_count; ++i)
        {
                if (data->meshes[i].weights)
                {
                        CGLTF_ASSERT_IF(data->meshes[i].primitives_count && data->meshes[i].primitives[0].targets_count != data->meshes[i].weights_count, cgltf_result_invalid_gltf);
                }

                if (data->meshes[i].target_names)
                {
                        CGLTF_ASSERT_IF(data->meshes[i].primitives_count && data->meshes[i].primitives[0].targets_count != data->meshes[i].target_names_count, cgltf_result_invalid_gltf);
                }

                for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
                {
                        CGLTF_ASSERT_IF(data->meshes[i].primitives[j].type == cgltf_primitive_type_invalid, cgltf_result_invalid_gltf);
                        CGLTF_ASSERT_IF(data->meshes[i].primitives[j].targets_count != data->meshes[i].primitives[0].targets_count, cgltf_result_invalid_gltf);

                        CGLTF_ASSERT_IF(data->meshes[i].primitives[j].attributes_count == 0, cgltf_result_invalid_gltf);

                        cgltf_accessor* first = data->meshes[i].primitives[j].attributes[0].data;

                        CGLTF_ASSERT_IF(first->count == 0, cgltf_result_invalid_gltf);

                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
                        {
                                CGLTF_ASSERT_IF(data->meshes[i].primitives[j].attributes[k].data->count != first->count, cgltf_result_invalid_gltf);
                        }

                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
                        {
                                for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
                                {
                                        CGLTF_ASSERT_IF(data->meshes[i].primitives[j].targets[k].attributes[m].data->count != first->count, cgltf_result_invalid_gltf);
                                }
                        }

                        cgltf_accessor* indices = data->meshes[i].primitives[j].indices;

                        CGLTF_ASSERT_IF(indices &&
                                indices->component_type != cgltf_component_type_r_8u &&
                                indices->component_type != cgltf_component_type_r_16u &&
                                indices->component_type != cgltf_component_type_r_32u, cgltf_result_invalid_gltf);

                        CGLTF_ASSERT_IF(indices && indices->type != cgltf_type_scalar, cgltf_result_invalid_gltf);
                        CGLTF_ASSERT_IF(indices && indices->stride != cgltf_component_size(indices->component_type), cgltf_result_invalid_gltf);

                        if (indices && indices->buffer_view && indices->buffer_view->buffer->data)
                        {
                                cgltf_size index_bound = cgltf_calc_index_bound(indices->buffer_view, indices->offset, indices->component_type, indices->count);

                                CGLTF_ASSERT_IF(index_bound >= first->count, cgltf_result_data_too_short);
                        }

                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].mappings_count; ++k)
                        {
                                CGLTF_ASSERT_IF(data->meshes[i].primitives[j].mappings[k].variant >= data->variants_count, cgltf_result_invalid_gltf);
                        }
                }
        }

        for (cgltf_size i = 0; i < data->nodes_count; ++i)
        {
                if (data->nodes[i].weights && data->nodes[i].mesh)
                {
                        CGLTF_ASSERT_IF(data->nodes[i].mesh->primitives_count && data->nodes[i].mesh->primitives[0].targets_count != data->nodes[i].weights_count, cgltf_result_invalid_gltf);
                }

                if (data->nodes[i].has_mesh_gpu_instancing)
                {
                        CGLTF_ASSERT_IF(data->nodes[i].mesh == NULL, cgltf_result_invalid_gltf);
                        CGLTF_ASSERT_IF(data->nodes[i].mesh_gpu_instancing.attributes_count == 0, cgltf_result_invalid_gltf);

                        cgltf_accessor* first = data->nodes[i].mesh_gpu_instancing.attributes[0].data;

                        for (cgltf_size k = 0; k < data->nodes[i].mesh_gpu_instancing.attributes_count; ++k)
                        {
                                CGLTF_ASSERT_IF(data->nodes[i].mesh_gpu_instancing.attributes[k].data->count != first->count, cgltf_result_invalid_gltf);
                        }
                }
        }

        for (cgltf_size i = 0; i < data->nodes_count; ++i)
        {
                cgltf_node* p1 = data->nodes[i].parent;
                cgltf_node* p2 = p1 ? p1->parent : NULL;

                while (p1 && p2)
                {
                        CGLTF_ASSERT_IF(p1 == p2, cgltf_result_invalid_gltf);

                        p1 = p1->parent;
                        p2 = p2->parent ? p2->parent->parent : NULL;
                }
        }

        for (cgltf_size i = 0; i < data->scenes_count; ++i)
        {
                for (cgltf_size j = 0; j < data->scenes[i].nodes_count; ++j)
                {
                        CGLTF_ASSERT_IF(data->scenes[i].nodes[j]->parent, cgltf_result_invalid_gltf);
                }
        }

        for (cgltf_size i = 0; i < data->animations_count; ++i)
        {
                for (cgltf_size j = 0; j < data->animations[i].channels_count; ++j)
                {
                        cgltf_animation_channel* channel = &data->animations[i].channels[j];

                        if (!channel->target_node)
                        {
                                continue;
                        }

                        cgltf_size components = 1;

                        if (channel->target_path == cgltf_animation_path_type_weights)
                        {
                                CGLTF_ASSERT_IF(!channel->target_node->mesh || !channel->target_node->mesh->primitives_count, cgltf_result_invalid_gltf);

                                components = channel->target_node->mesh->primitives[0].targets_count;
                        }

                        cgltf_size values = channel->sampler->interpolation == cgltf_interpolation_type_cubic_spline ? 3 : 1;

                        CGLTF_ASSERT_IF(channel->sampler->input->count * components * values != channel->sampler->output->count, cgltf_result_invalid_gltf);
                }
        }

        for (cgltf_size i = 0; i < data->variants_count; ++i)
        {
                CGLTF_ASSERT_IF(!data->variants[i].name, cgltf_result_invalid_gltf);
        }

        return cgltf_result_success;
}

cgltf_result cgltf_copy_extras_json(const cgltf_data* data, const cgltf_extras* extras, char* dest, cgltf_size* dest_size)
{
        cgltf_size json_size = extras->end_offset - extras->start_offset;

        if (!dest)
        {
                if (dest_size)
                {
                        *dest_size = json_size + 1;
                        return cgltf_result_success;
                }
                return cgltf_result_invalid_options;
        }

        if (*dest_size + 1 < json_size)
        {
                strncpy(dest, data->json + extras->start_offset, *dest_size - 1);
                dest[*dest_size - 1] = 0;
        }
        else
        {
                strncpy(dest, data->json + extras->start_offset, json_size);
                dest[json_size] = 0;
        }

        return cgltf_result_success;
}

static void cgltf_free_extras(cgltf_data* data, cgltf_extras* extras)
{
        data->memory.free_func(data->memory.user_data, extras->data);
}

static void cgltf_free_extensions(cgltf_data* data, cgltf_extension* extensions, cgltf_size extensions_count)
{
        for (cgltf_size i = 0; i < extensions_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, extensions[i].name);
                data->memory.free_func(data->memory.user_data, extensions[i].data);
        }
        data->memory.free_func(data->memory.user_data, extensions);
}

void cgltf_free(cgltf_data* data)
{
        if (!data)
        {
                return;
        }

        void (*file_release)(const struct cgltf_memory_options*, const struct cgltf_file_options*, void* data, cgltf_size size) = data->file.release ? data->file.release : cgltf_default_file_release;

        data->memory.free_func(data->memory.user_data, data->asset.copyright);
        data->memory.free_func(data->memory.user_data, data->asset.generator);
        data->memory.free_func(data->memory.user_data, data->asset.version);
        data->memory.free_func(data->memory.user_data, data->asset.min_version);

        cgltf_free_extensions(data, data->asset.extensions, data->asset.extensions_count);
        cgltf_free_extras(data, &data->asset.extras);

        for (cgltf_size i = 0; i < data->accessors_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->accessors[i].name);

                cgltf_free_extensions(data, data->accessors[i].extensions, data->accessors[i].extensions_count);
                cgltf_free_extras(data, &data->accessors[i].extras);
        }
        data->memory.free_func(data->memory.user_data, data->accessors);

        for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->buffer_views[i].name);
                data->memory.free_func(data->memory.user_data, data->buffer_views[i].data);

                cgltf_free_extensions(data, data->buffer_views[i].extensions, data->buffer_views[i].extensions_count);
                cgltf_free_extras(data, &data->buffer_views[i].extras);
        }
        data->memory.free_func(data->memory.user_data, data->buffer_views);

        for (cgltf_size i = 0; i < data->buffers_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->buffers[i].name);

                if (data->buffers[i].data_free_method == cgltf_data_free_method_file_release)
                {
                        file_release(&data->memory, &data->file, data->buffers[i].data, data->buffers[i].size);
                }
                else if (data->buffers[i].data_free_method == cgltf_data_free_method_memory_free)
                {
                        data->memory.free_func(data->memory.user_data, data->buffers[i].data);
                }

                data->memory.free_func(data->memory.user_data, data->buffers[i].uri);

                cgltf_free_extensions(data, data->buffers[i].extensions, data->buffers[i].extensions_count);
                cgltf_free_extras(data, &data->buffers[i].extras);
        }
        data->memory.free_func(data->memory.user_data, data->buffers);

        for (cgltf_size i = 0; i < data->meshes_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->meshes[i].name);

                for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
                {
                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
                        {
                                data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].attributes[k].name);
                        }

                        data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].attributes);

                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
                        {
                                for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
                                {
                                        data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].targets[k].attributes[m].name);
                                }

                                data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].targets[k].attributes);
                        }

                        data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].targets);

                        if (data->meshes[i].primitives[j].has_draco_mesh_compression)
                        {
                                for (cgltf_size k = 0; k < data->meshes[i].primitives[j].draco_mesh_compression.attributes_count; ++k)
                                {
                                        data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].draco_mesh_compression.attributes[k].name);
                                }

                                data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].draco_mesh_compression.attributes);
                        }

                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].mappings_count; ++k)
                        {
                                cgltf_free_extras(data, &data->meshes[i].primitives[j].mappings[k].extras);
                        }

                        data->memory.free_func(data->memory.user_data, data->meshes[i].primitives[j].mappings);

                        cgltf_free_extensions(data, data->meshes[i].primitives[j].extensions, data->meshes[i].primitives[j].extensions_count);
                        cgltf_free_extras(data, &data->meshes[i].primitives[j].extras);
                }

                data->memory.free_func(data->memory.user_data, data->meshes[i].primitives);
                data->memory.free_func(data->memory.user_data, data->meshes[i].weights);

                for (cgltf_size j = 0; j < data->meshes[i].target_names_count; ++j)
                {
                        data->memory.free_func(data->memory.user_data, data->meshes[i].target_names[j]);
                }

                cgltf_free_extensions(data, data->meshes[i].extensions, data->meshes[i].extensions_count);
                cgltf_free_extras(data, &data->meshes[i].extras);

                data->memory.free_func(data->memory.user_data, data->meshes[i].target_names);
        }

        data->memory.free_func(data->memory.user_data, data->meshes);

        for (cgltf_size i = 0; i < data->materials_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->materials[i].name);

                cgltf_free_extensions(data, data->materials[i].extensions, data->materials[i].extensions_count);
                cgltf_free_extras(data, &data->materials[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->materials);

        for (cgltf_size i = 0; i < data->images_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->images[i].name);
                data->memory.free_func(data->memory.user_data, data->images[i].uri);
                data->memory.free_func(data->memory.user_data, data->images[i].mime_type);

                cgltf_free_extensions(data, data->images[i].extensions, data->images[i].extensions_count);
                cgltf_free_extras(data, &data->images[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->images);

        for (cgltf_size i = 0; i < data->textures_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->textures[i].name);

                cgltf_free_extensions(data, data->textures[i].extensions, data->textures[i].extensions_count);
                cgltf_free_extras(data, &data->textures[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->textures);

        for (cgltf_size i = 0; i < data->samplers_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->samplers[i].name);

                cgltf_free_extensions(data, data->samplers[i].extensions, data->samplers[i].extensions_count);
                cgltf_free_extras(data, &data->samplers[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->samplers);

        for (cgltf_size i = 0; i < data->skins_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->skins[i].name);
                data->memory.free_func(data->memory.user_data, data->skins[i].joints);

                cgltf_free_extensions(data, data->skins[i].extensions, data->skins[i].extensions_count);
                cgltf_free_extras(data, &data->skins[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->skins);

        for (cgltf_size i = 0; i < data->cameras_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->cameras[i].name);

                if (data->cameras[i].type == cgltf_camera_type_perspective)
                {
                        cgltf_free_extras(data, &data->cameras[i].data.perspective.extras);
                }
                else if (data->cameras[i].type == cgltf_camera_type_orthographic)
                {
                        cgltf_free_extras(data, &data->cameras[i].data.orthographic.extras);
                }

                cgltf_free_extensions(data, data->cameras[i].extensions, data->cameras[i].extensions_count);
                cgltf_free_extras(data, &data->cameras[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->cameras);

        for (cgltf_size i = 0; i < data->lights_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->lights[i].name);

                cgltf_free_extras(data, &data->lights[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->lights);

        for (cgltf_size i = 0; i < data->nodes_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->nodes[i].name);
                data->memory.free_func(data->memory.user_data, data->nodes[i].children);
                data->memory.free_func(data->memory.user_data, data->nodes[i].weights);

                if (data->nodes[i].has_mesh_gpu_instancing)
                {
                        for (cgltf_size j = 0; j < data->nodes[i].mesh_gpu_instancing.attributes_count; ++j)
                        {
                                data->memory.free_func(data->memory.user_data, data->nodes[i].mesh_gpu_instancing.attributes[j].name);
                        }

                        data->memory.free_func(data->memory.user_data, data->nodes[i].mesh_gpu_instancing.attributes);
                }

                cgltf_free_extensions(data, data->nodes[i].extensions, data->nodes[i].extensions_count);
                cgltf_free_extras(data, &data->nodes[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->nodes);

        for (cgltf_size i = 0; i < data->scenes_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->scenes[i].name);
                data->memory.free_func(data->memory.user_data, data->scenes[i].nodes);

                cgltf_free_extensions(data, data->scenes[i].extensions, data->scenes[i].extensions_count);
                cgltf_free_extras(data, &data->scenes[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->scenes);

        for (cgltf_size i = 0; i < data->animations_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->animations[i].name);
                for (cgltf_size j = 0; j <  data->animations[i].samplers_count; ++j)
                {
                        cgltf_free_extensions(data, data->animations[i].samplers[j].extensions, data->animations[i].samplers[j].extensions_count);
                        cgltf_free_extras(data, &data->animations[i].samplers[j].extras);
                }
                data->memory.free_func(data->memory.user_data, data->animations[i].samplers);

                for (cgltf_size j = 0; j <  data->animations[i].channels_count; ++j)
                {
                        cgltf_free_extensions(data, data->animations[i].channels[j].extensions, data->animations[i].channels[j].extensions_count);
                        cgltf_free_extras(data, &data->animations[i].channels[j].extras);
                }
                data->memory.free_func(data->memory.user_data, data->animations[i].channels);

                cgltf_free_extensions(data, data->animations[i].extensions, data->animations[i].extensions_count);
                cgltf_free_extras(data, &data->animations[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->animations);

        for (cgltf_size i = 0; i < data->variants_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->variants[i].name);

                cgltf_free_extras(data, &data->variants[i].extras);
        }

        data->memory.free_func(data->memory.user_data, data->variants);

        cgltf_free_extensions(data, data->data_extensions, data->data_extensions_count);
        cgltf_free_extras(data, &data->extras);

        for (cgltf_size i = 0; i < data->extensions_used_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->extensions_used[i]);
        }

        data->memory.free_func(data->memory.user_data, data->extensions_used);

        for (cgltf_size i = 0; i < data->extensions_required_count; ++i)
        {
                data->memory.free_func(data->memory.user_data, data->extensions_required[i]);
        }

        data->memory.free_func(data->memory.user_data, data->extensions_required);

        file_release(&data->memory, &data->file, data->file_data, data->file_size);

        data->memory.free_func(data->memory.user_data, data);
}

void cgltf_node_transform_local(const cgltf_node* node, cgltf_float* out_matrix)
{
        cgltf_float* lm = out_matrix;

        if (node->has_matrix)
        {
                memcpy(lm, node->matrix, sizeof(float) * 16);
        }
        else
        {
                float tx = node->translation[0];
                float ty = node->translation[1];
                float tz = node->translation[2];

                float qx = node->rotation[0];
                float qy = node->rotation[1];
                float qz = node->rotation[2];
                float qw = node->rotation[3];

                float sx = node->scale[0];
                float sy = node->scale[1];
                float sz = node->scale[2];

                lm[0] = (1 - 2 * qy*qy - 2 * qz*qz) * sx;
                lm[1] = (2 * qx*qy + 2 * qz*qw) * sx;
                lm[2] = (2 * qx*qz - 2 * qy*qw) * sx;
                lm[3] = 0.f;

                lm[4] = (2 * qx*qy - 2 * qz*qw) * sy;
                lm[5] = (1 - 2 * qx*qx - 2 * qz*qz) * sy;
                lm[6] = (2 * qy*qz + 2 * qx*qw) * sy;
                lm[7] = 0.f;

                lm[8] = (2 * qx*qz + 2 * qy*qw) * sz;
                lm[9] = (2 * qy*qz - 2 * qx*qw) * sz;
                lm[10] = (1 - 2 * qx*qx - 2 * qy*qy) * sz;
                lm[11] = 0.f;

                lm[12] = tx;
                lm[13] = ty;
                lm[14] = tz;
                lm[15] = 1.f;
        }
}

void cgltf_node_transform_world(const cgltf_node* node, cgltf_float* out_matrix)
{
        cgltf_float* lm = out_matrix;
        cgltf_node_transform_local(node, lm);

        const cgltf_node* parent = node->parent;

        while (parent)
        {
                float pm[16];
                cgltf_node_transform_local(parent, pm);

                for (int i = 0; i < 4; ++i)
                {
                        float l0 = lm[i * 4 + 0];
                        float l1 = lm[i * 4 + 1];
                        float l2 = lm[i * 4 + 2];

                        float r0 = l0 * pm[0] + l1 * pm[4] + l2 * pm[8];
                        float r1 = l0 * pm[1] + l1 * pm[5] + l2 * pm[9];
                        float r2 = l0 * pm[2] + l1 * pm[6] + l2 * pm[10];

                        lm[i * 4 + 0] = r0;
                        lm[i * 4 + 1] = r1;
                        lm[i * 4 + 2] = r2;
                }

                lm[12] += pm[12];
                lm[13] += pm[13];
                lm[14] += pm[14];

                parent = parent->parent;
        }
}

static cgltf_ssize cgltf_component_read_integer(const void* in, cgltf_component_type component_type)
{
        switch (component_type)
        {
                case cgltf_component_type_r_16:
                        return *((const int16_t*) in);
                case cgltf_component_type_r_16u:
                        return *((const uint16_t*) in);
                case cgltf_component_type_r_32u:
                        return *((const uint32_t*) in);
                case cgltf_component_type_r_8:
                        return *((const int8_t*) in);
                case cgltf_component_type_r_8u:
                        return *((const uint8_t*) in);
                default:
                        return 0;
        }
}

static cgltf_size cgltf_component_read_index(const void* in, cgltf_component_type component_type)
{
        switch (component_type)
        {
                case cgltf_component_type_r_16u:
                        return *((const uint16_t*) in);
                case cgltf_component_type_r_32u:
                        return *((const uint32_t*) in);
                case cgltf_component_type_r_8u:
                        return *((const uint8_t*) in);
                default:
                        return 0;
        }
}

static cgltf_float cgltf_component_read_float(const void* in, cgltf_component_type component_type, cgltf_bool normalized)
{
        if (component_type == cgltf_component_type_r_32f)
        {
                return *((const float*) in);
        }

        if (normalized)
        {
                switch (component_type)
                {
                        // note: glTF spec doesn't currently define normalized conversions for 32-bit integers
                        case cgltf_component_type_r_16:
                                return *((const int16_t*) in) / (cgltf_float)32767;
                        case cgltf_component_type_r_16u:
                                return *((const uint16_t*) in) / (cgltf_float)65535;
                        case cgltf_component_type_r_8:
                                return *((const int8_t*) in) / (cgltf_float)127;
                        case cgltf_component_type_r_8u:
                                return *((const uint8_t*) in) / (cgltf_float)255;
                        default:
                                return 0;
                }
        }

        return (cgltf_float)cgltf_component_read_integer(in, component_type);
}

static cgltf_bool cgltf_element_read_float(const uint8_t* element, cgltf_type type, cgltf_component_type component_type, cgltf_bool normalized, cgltf_float* out, cgltf_size element_size)
{
        cgltf_size num_components = cgltf_num_components(type);

        if (element_size < num_components) {
                return 0;
        }

        // There are three special cases for component extraction, see #data-alignment in the 2.0 spec.

        cgltf_size component_size = cgltf_component_size(component_type);

        if (type == cgltf_type_mat2 && component_size == 1)
        {
                out[0] = cgltf_component_read_float(element, component_type, normalized);
                out[1] = cgltf_component_read_float(element + 1, component_type, normalized);
                out[2] = cgltf_component_read_float(element + 4, component_type, normalized);
                out[3] = cgltf_component_read_float(element + 5, component_type, normalized);
                return 1;
        }

        if (type == cgltf_type_mat3 && component_size == 1)
        {
                out[0] = cgltf_component_read_float(element, component_type, normalized);
                out[1] = cgltf_component_read_float(element + 1, component_type, normalized);
                out[2] = cgltf_component_read_float(element + 2, component_type, normalized);
                out[3] = cgltf_component_read_float(element + 4, component_type, normalized);
                out[4] = cgltf_component_read_float(element + 5, component_type, normalized);
                out[5] = cgltf_component_read_float(element + 6, component_type, normalized);
                out[6] = cgltf_component_read_float(element + 8, component_type, normalized);
                out[7] = cgltf_component_read_float(element + 9, component_type, normalized);
                out[8] = cgltf_component_read_float(element + 10, component_type, normalized);
                return 1;
        }

        if (type == cgltf_type_mat3 && component_size == 2)
        {
                out[0] = cgltf_component_read_float(element, component_type, normalized);
                out[1] = cgltf_component_read_float(element + 2, component_type, normalized);
                out[2] = cgltf_component_read_float(element + 4, component_type, normalized);
                out[3] = cgltf_component_read_float(element + 8, component_type, normalized);
                out[4] = cgltf_component_read_float(element + 10, component_type, normalized);
                out[5] = cgltf_component_read_float(element + 12, component_type, normalized);
                out[6] = cgltf_component_read_float(element + 16, component_type, normalized);
                out[7] = cgltf_component_read_float(element + 18, component_type, normalized);
                out[8] = cgltf_component_read_float(element + 20, component_type, normalized);
                return 1;
        }

        for (cgltf_size i = 0; i < num_components; ++i)
        {
                out[i] = cgltf_component_read_float(element + component_size * i, component_type, normalized);
        }
        return 1;
}

const uint8_t* cgltf_buffer_view_data(const cgltf_buffer_view* view)
{
        if (view->data)
                return (const uint8_t*)view->data;

        if (!view->buffer->data)
                return NULL;

        const uint8_t* result = (const uint8_t*)view->buffer->data;
        result += view->offset;
        return result;
}

const cgltf_accessor* cgltf_find_accessor(const cgltf_primitive* prim, cgltf_attribute_type type, cgltf_int index)
{
        for (cgltf_size i = 0; i < prim->attributes_count; ++i)
        {
                const cgltf_attribute* attr = &prim->attributes[i];
                if (attr->type == type && attr->index == index)
                        return attr->data;
        }

        return NULL;
}

static const uint8_t* cgltf_find_sparse_index(const cgltf_accessor* accessor, cgltf_size needle)
{
        const cgltf_accessor_sparse* sparse = &accessor->sparse;
        const uint8_t* index_data = cgltf_buffer_view_data(sparse->indices_buffer_view);
        const uint8_t* value_data = cgltf_buffer_view_data(sparse->values_buffer_view);

        if (index_data == NULL || value_data == NULL)
                return NULL;

        index_data += sparse->indices_byte_offset;
        value_data += sparse->values_byte_offset;

        cgltf_size index_stride = cgltf_component_size(sparse->indices_component_type);

        cgltf_size offset = 0;
        cgltf_size length = sparse->count;

        while (length)
        {
                cgltf_size rem = length % 2;
                length /= 2;

                cgltf_size index = cgltf_component_read_index(index_data + (offset + length) * index_stride, sparse->indices_component_type);
                offset += index < needle ? length + rem : 0;
        }

        if (offset == sparse->count)
                return NULL;

        cgltf_size index = cgltf_component_read_index(index_data + offset * index_stride, sparse->indices_component_type);
        return index == needle ? value_data + offset * accessor->stride : NULL;
}

cgltf_bool cgltf_accessor_read_float(const cgltf_accessor* accessor, cgltf_size index, cgltf_float* out, cgltf_size element_size)
{
        if (accessor->is_sparse)
        {
                const uint8_t* element = cgltf_find_sparse_index(accessor, index);
                if (element)
                        return cgltf_element_read_float(element, accessor->type, accessor->component_type, accessor->normalized, out, element_size);
        }
        if (accessor->buffer_view == NULL)
        {
                memset(out, 0, element_size * sizeof(cgltf_float));
                return 1;
        }
        const uint8_t* element = cgltf_buffer_view_data(accessor->buffer_view);
        if (element == NULL)
        {
                return 0;
        }
        element += accessor->offset + accessor->stride * index;
        return cgltf_element_read_float(element, accessor->type, accessor->component_type, accessor->normalized, out, element_size);
}

cgltf_size cgltf_accessor_unpack_floats(const cgltf_accessor* accessor, cgltf_float* out, cgltf_size float_count)
{
        cgltf_size floats_per_element = cgltf_num_components(accessor->type);
        cgltf_size available_floats = accessor->count * floats_per_element;
        if (out == NULL)
        {
                return available_floats;
        }

        float_count = available_floats < float_count ? available_floats : float_count;
        cgltf_size element_count = float_count / floats_per_element;

        // First pass: convert each element in the base accessor.
        if (accessor->buffer_view == NULL)
        {
                memset(out, 0, element_count * floats_per_element * sizeof(cgltf_float));
        }
        else
        {
                const uint8_t* element = cgltf_buffer_view_data(accessor->buffer_view);
                if (element == NULL)
                {
                        return 0;
                }
                element += accessor->offset;

                if (accessor->component_type == cgltf_component_type_r_32f && accessor->stride == floats_per_element * sizeof(cgltf_float))
                {
                        memcpy(out, element, element_count * floats_per_element * sizeof(cgltf_float));
                }
                else
                {
                        cgltf_float* dest = out;

                        for (cgltf_size index = 0; index < element_count; index++, dest += floats_per_element, element += accessor->stride)
                        {
                                if (!cgltf_element_read_float(element, accessor->type, accessor->component_type, accessor->normalized, dest, floats_per_element))
                                {
                                        return 0;
                                }
                        }
                }
        }

        // Second pass: write out each element in the sparse accessor.
        if (accessor->is_sparse)
        {
                const cgltf_accessor_sparse* sparse = &accessor->sparse;

                const uint8_t* index_data = cgltf_buffer_view_data(sparse->indices_buffer_view);
                const uint8_t* reader_head = cgltf_buffer_view_data(sparse->values_buffer_view);

                if (index_data == NULL || reader_head == NULL)
                {
                        return 0;
                }

                index_data += sparse->indices_byte_offset;
                reader_head += sparse->values_byte_offset;

                cgltf_size index_stride = cgltf_component_size(sparse->indices_component_type);
                for (cgltf_size reader_index = 0; reader_index < sparse->count; reader_index++, index_data += index_stride, reader_head += accessor->stride)
                {
                        size_t writer_index = cgltf_component_read_index(index_data, sparse->indices_component_type);
                        float* writer_head = out + writer_index * floats_per_element;

                        if (!cgltf_element_read_float(reader_head, accessor->type, accessor->component_type, accessor->normalized, writer_head, floats_per_element))
                        {
                                return 0;
                        }
                }
        }

        return element_count * floats_per_element;
}

static cgltf_uint cgltf_component_read_uint(const void* in, cgltf_component_type component_type)
{
        switch (component_type)
        {
                case cgltf_component_type_r_8:
                        return *((const int8_t*) in);

                case cgltf_component_type_r_8u:
                        return *((const uint8_t*) in);

                case cgltf_component_type_r_16:
                        return *((const int16_t*) in);

                case cgltf_component_type_r_16u:
                        return *((const uint16_t*) in);

                case cgltf_component_type_r_32u:
                        return *((const uint32_t*) in);

                default:
                        return 0;
        }
}

static cgltf_bool cgltf_element_read_uint(const uint8_t* element, cgltf_type type, cgltf_component_type component_type, cgltf_uint* out, cgltf_size element_size)
{
        cgltf_size num_components = cgltf_num_components(type);

        if (element_size < num_components)
        {
                return 0;
        }

        // Reading integer matrices is not a valid use case
        if (type == cgltf_type_mat2 || type == cgltf_type_mat3 || type == cgltf_type_mat4)
        {
                return 0;
        }

        cgltf_size component_size = cgltf_component_size(component_type);

        for (cgltf_size i = 0; i < num_components; ++i)
        {
                out[i] = cgltf_component_read_uint(element + component_size * i, component_type);
        }
        return 1;
}

cgltf_bool cgltf_accessor_read_uint(const cgltf_accessor* accessor, cgltf_size index, cgltf_uint* out, cgltf_size element_size)
{
        if (accessor->is_sparse)
        {
                const uint8_t* element = cgltf_find_sparse_index(accessor, index);
                if (element)
                        return cgltf_element_read_uint(element, accessor->type, accessor->component_type, out, element_size);
        }
        if (accessor->buffer_view == NULL)
        {
                memset(out, 0, element_size * sizeof(cgltf_uint));
                return 1;
        }
        const uint8_t* element = cgltf_buffer_view_data(accessor->buffer_view);
        if (element == NULL)
        {
                return 0;
        }
        element += accessor->offset + accessor->stride * index;
        return cgltf_element_read_uint(element, accessor->type, accessor->component_type, out, element_size);
}

cgltf_size cgltf_accessor_read_index(const cgltf_accessor* accessor, cgltf_size index)
{
        if (accessor->is_sparse)
        {
                const uint8_t* element = cgltf_find_sparse_index(accessor, index);
                if (element)
                        return cgltf_component_read_index(element, accessor->component_type);
        }
        if (accessor->buffer_view == NULL)
        {
                return 0;
        }
        const uint8_t* element = cgltf_buffer_view_data(accessor->buffer_view);
        if (element == NULL)
        {
                return 0; // This is an error case, but we can't communicate the error with existing interface.
        }
        element += accessor->offset + accessor->stride * index;
        return cgltf_component_read_index(element, accessor->component_type);
}

cgltf_size cgltf_mesh_index(const cgltf_data* data, const cgltf_mesh* object)
{
        assert(object && (cgltf_size)(object - data->meshes) < data->meshes_count);
        return (cgltf_size)(object - data->meshes);
}

cgltf_size cgltf_material_index(const cgltf_data* data, const cgltf_material* object)
{
        assert(object && (cgltf_size)(object - data->materials) < data->materials_count);
        return (cgltf_size)(object - data->materials);
}

cgltf_size cgltf_accessor_index(const cgltf_data* data, const cgltf_accessor* object)
{
        assert(object && (cgltf_size)(object - data->accessors) < data->accessors_count);
        return (cgltf_size)(object - data->accessors);
}

cgltf_size cgltf_buffer_view_index(const cgltf_data* data, const cgltf_buffer_view* object)
{
        assert(object && (cgltf_size)(object - data->buffer_views) < data->buffer_views_count);
        return (cgltf_size)(object - data->buffer_views);
}

cgltf_size cgltf_buffer_index(const cgltf_data* data, const cgltf_buffer* object)
{
        assert(object && (cgltf_size)(object - data->buffers) < data->buffers_count);
        return (cgltf_size)(object - data->buffers);
}

cgltf_size cgltf_image_index(const cgltf_data* data, const cgltf_image* object)
{
        assert(object && (cgltf_size)(object - data->images) < data->images_count);
        return (cgltf_size)(object - data->images);
}

cgltf_size cgltf_texture_index(const cgltf_data* data, const cgltf_texture* object)
{
        assert(object && (cgltf_size)(object - data->textures) < data->textures_count);
        return (cgltf_size)(object - data->textures);
}

cgltf_size cgltf_sampler_index(const cgltf_data* data, const cgltf_sampler* object)
{
        assert(object && (cgltf_size)(object - data->samplers) < data->samplers_count);
        return (cgltf_size)(object - data->samplers);
}

cgltf_size cgltf_skin_index(const cgltf_data* data, const cgltf_skin* object)
{
        assert(object && (cgltf_size)(object - data->skins) < data->skins_count);
        return (cgltf_size)(object - data->skins);
}

cgltf_size cgltf_camera_index(const cgltf_data* data, const cgltf_camera* object)
{
        assert(object && (cgltf_size)(object - data->cameras) < data->cameras_count);
        return (cgltf_size)(object - data->cameras);
}

cgltf_size cgltf_light_index(const cgltf_data* data, const cgltf_light* object)
{
        assert(object && (cgltf_size)(object - data->lights) < data->lights_count);
        return (cgltf_size)(object - data->lights);
}

cgltf_size cgltf_node_index(const cgltf_data* data, const cgltf_node* object)
{
        assert(object && (cgltf_size)(object - data->nodes) < data->nodes_count);
        return (cgltf_size)(object - data->nodes);
}

cgltf_size cgltf_scene_index(const cgltf_data* data, const cgltf_scene* object)
{
        assert(object && (cgltf_size)(object - data->scenes) < data->scenes_count);
        return (cgltf_size)(object - data->scenes);
}

cgltf_size cgltf_animation_index(const cgltf_data* data, const cgltf_animation* object)
{
        assert(object && (cgltf_size)(object - data->animations) < data->animations_count);
        return (cgltf_size)(object - data->animations);
}

cgltf_size cgltf_animation_sampler_index(const cgltf_animation* animation, const cgltf_animation_sampler* object)
{
        assert(object && (cgltf_size)(object - animation->samplers) < animation->samplers_count);
        return (cgltf_size)(object - animation->samplers);
}

cgltf_size cgltf_animation_channel_index(const cgltf_animation* animation, const cgltf_animation_channel* object)
{
        assert(object && (cgltf_size)(object - animation->channels) < animation->channels_count);
        return (cgltf_size)(object - animation->channels);
}

cgltf_size cgltf_accessor_unpack_indices(const cgltf_accessor* accessor, void* out, cgltf_size out_component_size, cgltf_size index_count)
{
        if (out == NULL)
        {
                return accessor->count;
        }

        cgltf_size numbers_per_element = cgltf_num_components(accessor->type);
        cgltf_size available_numbers = accessor->count * numbers_per_element;

        index_count = available_numbers < index_count ? available_numbers : index_count;
        cgltf_size index_component_size = cgltf_component_size(accessor->component_type);

        if (accessor->is_sparse)
        {
                return 0;
        }
        if (accessor->buffer_view == NULL)
        {
                return 0;
        }
        if (index_component_size > out_component_size)
        {
                return 0;
        }
        const uint8_t* element = cgltf_buffer_view_data(accessor->buffer_view);
        if (element == NULL)
        {
                return 0;
        }
        element += accessor->offset;

        if (index_component_size == out_component_size && accessor->stride == out_component_size * numbers_per_element)
        {
                memcpy(out, element, index_count * index_component_size);
                return index_count;
        }

        // Data couldn't be copied with memcpy due to stride being larger than the component size.
        // OR
        // The component size of the output array is larger than the component size of the index data, so index data will be padded.
        switch (out_component_size)
        {
        case 1:
                for (cgltf_size index = 0; index < index_count; index++, element += accessor->stride)
                {
                        ((uint8_t*)out)[index] = (uint8_t)cgltf_component_read_index(element, accessor->component_type);
                }
                break;
        case 2:
                for (cgltf_size index = 0; index < index_count; index++, element += accessor->stride)
                {
                        ((uint16_t*)out)[index] = (uint16_t)cgltf_component_read_index(element, accessor->component_type);
                }
                break;
        case 4:
                for (cgltf_size index = 0; index < index_count; index++, element += accessor->stride)
                {
                        ((uint32_t*)out)[index] = (uint32_t)cgltf_component_read_index(element, accessor->component_type);
                }
                break;
        default:
                return 0;
        }

        return index_count;
}

#define CGLTF_ERROR_JSON -1
#define CGLTF_ERROR_NOMEM -2
#define CGLTF_ERROR_LEGACY -3

#define CGLTF_CHECK_TOKTYPE(tok_, type_) if ((tok_).type != (type_)) { return CGLTF_ERROR_JSON; }
#define CGLTF_CHECK_TOKTYPE_RET(tok_, type_, ret_) if ((tok_).type != (type_)) { return ret_; }
#define CGLTF_CHECK_KEY(tok_) if ((tok_).type != JSMN_STRING || (tok_).size == 0) { return CGLTF_ERROR_JSON; } /* checking size for 0 verifies that a value follows the key */

#define CGLTF_PTRINDEX(type, idx) (type*)((cgltf_size)idx + 1)
#define CGLTF_PTRFIXUP(var, data, size) if (var) { if ((cgltf_size)var > size) { return CGLTF_ERROR_JSON; } var = &data[(cgltf_size)var-1]; }
#define CGLTF_PTRFIXUP_REQ(var, data, size) if (!var || (cgltf_size)var > size) { return CGLTF_ERROR_JSON; } var = &data[(cgltf_size)var-1];

static int cgltf_json_strcmp(jsmntok_t const* tok, const uint8_t* json_chunk, const char* str)
{
        CGLTF_CHECK_TOKTYPE(*tok, JSMN_STRING);
        size_t const str_len = strlen(str);
        size_t const name_length = (size_t)(tok->end - tok->start);
        return (str_len == name_length) ? strncmp((const char*)json_chunk + tok->start, str, str_len) : 128;
}

static int cgltf_json_to_int(jsmntok_t const* tok, const uint8_t* json_chunk)
{
        CGLTF_CHECK_TOKTYPE(*tok, JSMN_PRIMITIVE);
        char tmp[128];
        int size = (size_t)(tok->end - tok->start) < sizeof(tmp) ? (int)(tok->end - tok->start) : (int)(sizeof(tmp) - 1);
        strncpy(tmp, (const char*)json_chunk + tok->start, size);
        tmp[size] = 0;
        return CGLTF_ATOI(tmp);
}

static cgltf_size cgltf_json_to_size(jsmntok_t const* tok, const uint8_t* json_chunk)
{
        CGLTF_CHECK_TOKTYPE_RET(*tok, JSMN_PRIMITIVE, 0);
        char tmp[128];
        int size = (size_t)(tok->end - tok->start) < sizeof(tmp) ? (int)(tok->end - tok->start) : (int)(sizeof(tmp) - 1);
        strncpy(tmp, (const char*)json_chunk + tok->start, size);
        tmp[size] = 0;
        long long res = CGLTF_ATOLL(tmp);
        return res < 0 ? 0 : (cgltf_size)res;
}

static cgltf_float cgltf_json_to_float(jsmntok_t const* tok, const uint8_t* json_chunk)
{
        CGLTF_CHECK_TOKTYPE(*tok, JSMN_PRIMITIVE);
        char tmp[128];
        int size = (size_t)(tok->end - tok->start) < sizeof(tmp) ? (int)(tok->end - tok->start) : (int)(sizeof(tmp) - 1);
        strncpy(tmp, (const char*)json_chunk + tok->start, size);
        tmp[size] = 0;
        return (cgltf_float)CGLTF_ATOF(tmp);
}

static cgltf_bool cgltf_json_to_bool(jsmntok_t const* tok, const uint8_t* json_chunk)
{
        int size = (int)(tok->end - tok->start);
        return size == 4 && memcmp(json_chunk + tok->start, "true", 4) == 0;
}

static int cgltf_skip_json(jsmntok_t const* tokens, int i)
{
        int end = i + 1;

        while (i < end)
        {
                switch (tokens[i].type)
                {
                case JSMN_OBJECT:
                        end += tokens[i].size * 2;
                        break;

                case JSMN_ARRAY:
                        end += tokens[i].size;
                        break;

                case JSMN_PRIMITIVE:
                case JSMN_STRING:
                        break;

                default:
                        return -1;
                }

                i++;
        }

        return i;
}

static void cgltf_fill_float_array(float* out_array, int size, float value)
{
        for (int j = 0; j < size; ++j)
        {
                out_array[j] = value;
        }
}

static int cgltf_parse_json_float_array(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, float* out_array, int size)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
        if (tokens[i].size != size)
        {
                return CGLTF_ERROR_JSON;
        }
        ++i;
        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
                out_array[j] = cgltf_json_to_float(tokens + i, json_chunk);
                ++i;
        }
        return i;
}

static int cgltf_parse_json_string(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, char** out_string)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_STRING);
        if (*out_string)
        {
                return CGLTF_ERROR_JSON;
        }
        int size = (int)(tokens[i].end - tokens[i].start);
        char* result = (char*)options->memory.alloc_func(options->memory.user_data, size + 1);
        if (!result)
        {
                return CGLTF_ERROR_NOMEM;
        }
        strncpy(result, (const char*)json_chunk + tokens[i].start, size);
        result[size] = 0;
        *out_string = result;
        return i + 1;
}

static int cgltf_parse_json_array(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, size_t element_size, void** out_array, cgltf_size* out_size)
{
        (void)json_chunk;
        if (tokens[i].type != JSMN_ARRAY)
        {
                return tokens[i].type == JSMN_OBJECT ? CGLTF_ERROR_LEGACY : CGLTF_ERROR_JSON;
        }
        if (*out_array)
        {
                return CGLTF_ERROR_JSON;
        }
        int size = tokens[i].size;
        void* result = cgltf_calloc(options, element_size, size);
        if (!result)
        {
                return CGLTF_ERROR_NOMEM;
        }
        *out_array = result;
        *out_size = size;
        return i + 1;
}

static int cgltf_parse_json_string_array(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, char*** out_array, cgltf_size* out_size)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(char*), (void**)out_array, out_size);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < *out_size; ++j)
        {
                i = cgltf_parse_json_string(options, tokens, i, json_chunk, j + (*out_array));
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static void cgltf_parse_attribute_type(const char* name, cgltf_attribute_type* out_type, int* out_index)
{
        if (*name == '_')
        {
                *out_type = cgltf_attribute_type_custom;
                return;
        }

        const char* us = strchr(name, '_');
        size_t len = us ? (size_t)(us - name) : strlen(name);

        if (len == 8 && strncmp(name, "POSITION", 8) == 0)
        {
                *out_type = cgltf_attribute_type_position;
        }
        else if (len == 6 && strncmp(name, "NORMAL", 6) == 0)
        {
                *out_type = cgltf_attribute_type_normal;
        }
        else if (len == 7 && strncmp(name, "TANGENT", 7) == 0)
        {
                *out_type = cgltf_attribute_type_tangent;
        }
        else if (len == 8 && strncmp(name, "TEXCOORD", 8) == 0)
        {
                *out_type = cgltf_attribute_type_texcoord;
        }
        else if (len == 5 && strncmp(name, "COLOR", 5) == 0)
        {
                *out_type = cgltf_attribute_type_color;
        }
        else if (len == 6 && strncmp(name, "JOINTS", 6) == 0)
        {
                *out_type = cgltf_attribute_type_joints;
        }
        else if (len == 7 && strncmp(name, "WEIGHTS", 7) == 0)
        {
                *out_type = cgltf_attribute_type_weights;
        }
        else
        {
                *out_type = cgltf_attribute_type_invalid;
        }

        if (us && *out_type != cgltf_attribute_type_invalid)
        {
                *out_index = CGLTF_ATOI(us + 1);
                if (*out_index < 0)
                {
                        *out_type = cgltf_attribute_type_invalid;
                        *out_index = 0;
                }
        }
}

static int cgltf_parse_json_attribute_list(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_attribute** out_attributes, cgltf_size* out_attributes_count)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        if (*out_attributes)
        {
                return CGLTF_ERROR_JSON;
        }

        *out_attributes_count = tokens[i].size;
        *out_attributes = (cgltf_attribute*)cgltf_calloc(options, sizeof(cgltf_attribute), *out_attributes_count);
        ++i;

        if (!*out_attributes)
        {
                return CGLTF_ERROR_NOMEM;
        }

        for (cgltf_size j = 0; j < *out_attributes_count; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                i = cgltf_parse_json_string(options, tokens, i, json_chunk, &(*out_attributes)[j].name);
                if (i < 0)
                {
                        return CGLTF_ERROR_JSON;
                }

                cgltf_parse_attribute_type((*out_attributes)[j].name, &(*out_attributes)[j].type, &(*out_attributes)[j].index);

                (*out_attributes)[j].data = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
                ++i;
        }

        return i;
}

static int cgltf_parse_json_extras(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_extras* out_extras)
{
        if (out_extras->data)
        {
                return CGLTF_ERROR_JSON;
        }

        /* fill deprecated fields for now, this will be removed in the future */
        out_extras->start_offset = tokens[i].start;
        out_extras->end_offset = tokens[i].end;

        size_t start = tokens[i].start;
        size_t size = tokens[i].end - start;
        out_extras->data = (char*)options->memory.alloc_func(options->memory.user_data, size + 1);
        if (!out_extras->data)
        {
                return CGLTF_ERROR_NOMEM;
        }
        strncpy(out_extras->data, (const char*)json_chunk + start, size);
        out_extras->data[size] = '\0';

        i = cgltf_skip_json(tokens, i);
        return i;
}

static int cgltf_parse_json_unprocessed_extension(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_extension* out_extension)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_STRING);
        CGLTF_CHECK_TOKTYPE(tokens[i+1], JSMN_OBJECT);
        if (out_extension->name)
        {
                return CGLTF_ERROR_JSON;
        }

        cgltf_size name_length = tokens[i].end - tokens[i].start;
        out_extension->name = (char*)options->memory.alloc_func(options->memory.user_data, name_length + 1);
        if (!out_extension->name)
        {
                return CGLTF_ERROR_NOMEM;
        }
        strncpy(out_extension->name, (const char*)json_chunk + tokens[i].start, name_length);
        out_extension->name[name_length] = 0;
        i++;

        size_t start = tokens[i].start;
        size_t size = tokens[i].end - start;
        out_extension->data = (char*)options->memory.alloc_func(options->memory.user_data, size + 1);
        if (!out_extension->data)
        {
                return CGLTF_ERROR_NOMEM;
        }
        strncpy(out_extension->data, (const char*)json_chunk + start, size);
        out_extension->data[size] = '\0';

        i = cgltf_skip_json(tokens, i);

        return i;
}

static int cgltf_parse_json_unprocessed_extensions(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_size* out_extensions_count, cgltf_extension** out_extensions)
{
        ++i;

        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        if(*out_extensions)
        {
                return CGLTF_ERROR_JSON;
        }

        int extensions_size = tokens[i].size;
        *out_extensions_count = 0;
        *out_extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);

        if (!*out_extensions)
        {
                return CGLTF_ERROR_NOMEM;
        }

        ++i;

        for (int j = 0; j < extensions_size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                cgltf_size extension_index = (*out_extensions_count)++;
                cgltf_extension* extension = &((*out_extensions)[extension_index]);
                i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, extension);

                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_draco_mesh_compression(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_draco_mesh_compression* out_draco_mesh_compression)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "attributes") == 0)
                {
                        i = cgltf_parse_json_attribute_list(options, tokens, i + 1, json_chunk, &out_draco_mesh_compression->attributes, &out_draco_mesh_compression->attributes_count);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "bufferView") == 0)
                {
                        ++i;
                        out_draco_mesh_compression->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_mesh_gpu_instancing(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_mesh_gpu_instancing* out_mesh_gpu_instancing)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "attributes") == 0)
                {
                        i = cgltf_parse_json_attribute_list(options, tokens, i + 1, json_chunk, &out_mesh_gpu_instancing->attributes, &out_mesh_gpu_instancing->attributes_count);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_material_mapping_data(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_material_mapping* out_mappings, cgltf_size* offset)
{
        (void)options;
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

                int obj_size = tokens[i].size;
                ++i;

                int material = -1;
                int variants_tok = -1;
                int extras_tok = -1;

                for (int k = 0; k < obj_size; ++k)
                {
                        CGLTF_CHECK_KEY(tokens[i]);

                        if (cgltf_json_strcmp(tokens + i, json_chunk, "material") == 0)
                        {
                                ++i;
                                material = cgltf_json_to_int(tokens + i, json_chunk);
                                ++i;
                        }
                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "variants") == 0)
                        {
                                variants_tok = i+1;
                                CGLTF_CHECK_TOKTYPE(tokens[variants_tok], JSMN_ARRAY);

                                i = cgltf_skip_json(tokens, i+1);
                        }
                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                        {
                                extras_tok = i + 1;
                                i = cgltf_skip_json(tokens, extras_tok);
                        }
                        else
                        {
                                i = cgltf_skip_json(tokens, i+1);
                        }

                        if (i < 0)
                        {
                                return i;
                        }
                }

                if (material < 0 || variants_tok < 0)
                {
                        return CGLTF_ERROR_JSON;
                }

                if (out_mappings)
                {
                        for (int k = 0; k < tokens[variants_tok].size; ++k)
                        {
                                int variant = cgltf_json_to_int(&tokens[variants_tok + 1 + k], json_chunk);
                                if (variant < 0)
                                        return variant;

                                out_mappings[*offset].material = CGLTF_PTRINDEX(cgltf_material, material);
                                out_mappings[*offset].variant = variant;

                                if (extras_tok >= 0)
                                {
                                        int e = cgltf_parse_json_extras(options, tokens, extras_tok, json_chunk, &out_mappings[*offset].extras);
                                        if (e < 0)
                                                return e;
                                }

                                (*offset)++;
                        }
                }
                else
                {
                        (*offset) += tokens[variants_tok].size;
                }
        }

        return i;
}

static int cgltf_parse_json_material_mappings(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_primitive* out_prim)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "mappings") == 0)
                {
                        if (out_prim->mappings)
                        {
                                return CGLTF_ERROR_JSON;
                        }

                        cgltf_size mappings_offset = 0;
                        int k = cgltf_parse_json_material_mapping_data(options, tokens, i + 1, json_chunk, NULL, &mappings_offset);
                        if (k < 0)
                        {
                                return k;
                        }

                        out_prim->mappings_count = mappings_offset;
                        out_prim->mappings = (cgltf_material_mapping*)cgltf_calloc(options, sizeof(cgltf_material_mapping), out_prim->mappings_count);

                        mappings_offset = 0;
                        i = cgltf_parse_json_material_mapping_data(options, tokens, i + 1, json_chunk, out_prim->mappings, &mappings_offset);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static cgltf_primitive_type cgltf_json_to_primitive_type(jsmntok_t const* tok, const uint8_t* json_chunk)
{
        int type = cgltf_json_to_int(tok, json_chunk);

        switch (type)
        {
        case 0:
                return cgltf_primitive_type_points;
        case 1:
                return cgltf_primitive_type_lines;
        case 2:
                return cgltf_primitive_type_line_loop;
        case 3:
                return cgltf_primitive_type_line_strip;
        case 4:
                return cgltf_primitive_type_triangles;
        case 5:
                return cgltf_primitive_type_triangle_strip;
        case 6:
                return cgltf_primitive_type_triangle_fan;
        default:
                return cgltf_primitive_type_invalid;
        }
}

static int cgltf_parse_json_primitive(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_primitive* out_prim)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        out_prim->type = cgltf_primitive_type_triangles;

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "mode") == 0)
                {
                        ++i;
                        out_prim->type = cgltf_json_to_primitive_type(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "indices") == 0)
                {
                        ++i;
                        out_prim->indices = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "material") == 0)
                {
                        ++i;
                        out_prim->material = CGLTF_PTRINDEX(cgltf_material, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "attributes") == 0)
                {
                        i = cgltf_parse_json_attribute_list(options, tokens, i + 1, json_chunk, &out_prim->attributes, &out_prim->attributes_count);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "targets") == 0)
                {
                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_morph_target), (void**)&out_prim->targets, &out_prim->targets_count);
                        if (i < 0)
                        {
                                return i;
                        }

                        for (cgltf_size k = 0; k < out_prim->targets_count; ++k)
                        {
                                i = cgltf_parse_json_attribute_list(options, tokens, i, json_chunk, &out_prim->targets[k].attributes, &out_prim->targets[k].attributes_count);
                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_prim->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
                        if(out_prim->extensions)
                        {
                                return CGLTF_ERROR_JSON;
                        }

                        int extensions_size = tokens[i].size;
                        out_prim->extensions_count = 0;
                        out_prim->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);

                        if (!out_prim->extensions)
                        {
                                return CGLTF_ERROR_NOMEM;
                        }

                        ++i;
                        for (int k = 0; k < extensions_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_draco_mesh_compression") == 0)
                                {
                                        out_prim->has_draco_mesh_compression = 1;
                                        i = cgltf_parse_json_draco_mesh_compression(options, tokens, i + 1, json_chunk, &out_prim->draco_mesh_compression);
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_variants") == 0)
                                {
                                        i = cgltf_parse_json_material_mappings(options, tokens, i + 1, json_chunk, out_prim);
                                }
                                else
                                {
                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_prim->extensions[out_prim->extensions_count++]));
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_mesh(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_mesh* out_mesh)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_mesh->name);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "primitives") == 0)
                {
                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_primitive), (void**)&out_mesh->primitives, &out_mesh->primitives_count);
                        if (i < 0)
                        {
                                return i;
                        }

                        for (cgltf_size prim_index = 0; prim_index < out_mesh->primitives_count; ++prim_index)
                        {
                                i = cgltf_parse_json_primitive(options, tokens, i, json_chunk, &out_mesh->primitives[prim_index]);
                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "weights") == 0)
                {
                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_float), (void**)&out_mesh->weights, &out_mesh->weights_count);
                        if (i < 0)
                        {
                                return i;
                        }

                        i = cgltf_parse_json_float_array(tokens, i - 1, json_chunk, out_mesh->weights, (int)out_mesh->weights_count);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        ++i;

                        out_mesh->extras.start_offset = tokens[i].start;
                        out_mesh->extras.end_offset = tokens[i].end;

                        if (tokens[i].type == JSMN_OBJECT)
                        {
                                int extras_size = tokens[i].size;
                                ++i;

                                for (int k = 0; k < extras_size; ++k)
                                {
                                        CGLTF_CHECK_KEY(tokens[i]);

                                        if (cgltf_json_strcmp(tokens+i, json_chunk, "targetNames") == 0 && tokens[i+1].type == JSMN_ARRAY)
                                        {
                                                i = cgltf_parse_json_string_array(options, tokens, i + 1, json_chunk, &out_mesh->target_names, &out_mesh->target_names_count);
                                        }
                                        else
                                        {
                                                i = cgltf_skip_json(tokens, i+1);
                                        }

                                        if (i < 0)
                                        {
                                                return i;
                                        }
                                }
                        }
                        else
                        {
                                i = cgltf_skip_json(tokens, i);
                        }
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_mesh->extensions_count, &out_mesh->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_meshes(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_mesh), (void**)&out_data->meshes, &out_data->meshes_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->meshes_count; ++j)
        {
                i = cgltf_parse_json_mesh(options, tokens, i, json_chunk, &out_data->meshes[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static cgltf_component_type cgltf_json_to_component_type(jsmntok_t const* tok, const uint8_t* json_chunk)
{
        int type = cgltf_json_to_int(tok, json_chunk);

        switch (type)
        {
        case 5120:
                return cgltf_component_type_r_8;
        case 5121:
                return cgltf_component_type_r_8u;
        case 5122:
                return cgltf_component_type_r_16;
        case 5123:
                return cgltf_component_type_r_16u;
        case 5125:
                return cgltf_component_type_r_32u;
        case 5126:
                return cgltf_component_type_r_32f;
        default:
                return cgltf_component_type_invalid;
        }
}

static int cgltf_parse_json_accessor_sparse(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_accessor_sparse* out_sparse)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
                {
                        ++i;
                        out_sparse->count = cgltf_json_to_size(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "indices") == 0)
                {
                        ++i;
                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

                        int indices_size = tokens[i].size;
                        ++i;

                        for (int k = 0; k < indices_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
                                {
                                        ++i;
                                        out_sparse->indices_buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
                                {
                                        ++i;
                                        out_sparse->indices_byte_offset = cgltf_json_to_size(tokens + i, json_chunk);
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "componentType") == 0)
                                {
                                        ++i;
                                        out_sparse->indices_component_type = cgltf_json_to_component_type(tokens + i, json_chunk);
                                        ++i;
                                }
                                else
                                {
                                        i = cgltf_skip_json(tokens, i+1);
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "values") == 0)
                {
                        ++i;
                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

                        int values_size = tokens[i].size;
                        ++i;

                        for (int k = 0; k < values_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
                                {
                                        ++i;
                                        out_sparse->values_buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
                                {
                                        ++i;
                                        out_sparse->values_byte_offset = cgltf_json_to_size(tokens + i, json_chunk);
                                        ++i;
                                }
                                else
                                {
                                        i = cgltf_skip_json(tokens, i+1);
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_accessor(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_accessor* out_accessor)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_accessor->name);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
                {
                        ++i;
                        out_accessor->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
                {
                        ++i;
                        out_accessor->offset =
                                        cgltf_json_to_size(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "componentType") == 0)
                {
                        ++i;
                        out_accessor->component_type = cgltf_json_to_component_type(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "normalized") == 0)
                {
                        ++i;
                        out_accessor->normalized = cgltf_json_to_bool(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
                {
                        ++i;
                        out_accessor->count = cgltf_json_to_size(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "type") == 0)
                {
                        ++i;
                        if (cgltf_json_strcmp(tokens+i, json_chunk, "SCALAR") == 0)
                        {
                                out_accessor->type = cgltf_type_scalar;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC2") == 0)
                        {
                                out_accessor->type = cgltf_type_vec2;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC3") == 0)
                        {
                                out_accessor->type = cgltf_type_vec3;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC4") == 0)
                        {
                                out_accessor->type = cgltf_type_vec4;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT2") == 0)
                        {
                                out_accessor->type = cgltf_type_mat2;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT3") == 0)
                        {
                                out_accessor->type = cgltf_type_mat3;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT4") == 0)
                        {
                                out_accessor->type = cgltf_type_mat4;
                        }
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "min") == 0)
                {
                        ++i;
                        out_accessor->has_min = 1;
                        // note: we can't parse the precise number of elements since type may not have been computed yet
                        int min_size = tokens[i].size > 16 ? 16 : tokens[i].size;
                        i = cgltf_parse_json_float_array(tokens, i, json_chunk, out_accessor->min, min_size);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "max") == 0)
                {
                        ++i;
                        out_accessor->has_max = 1;
                        // note: we can't parse the precise number of elements since type may not have been computed yet
                        int max_size = tokens[i].size > 16 ? 16 : tokens[i].size;
                        i = cgltf_parse_json_float_array(tokens, i, json_chunk, out_accessor->max, max_size);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "sparse") == 0)
                {
                        out_accessor->is_sparse = 1;
                        i = cgltf_parse_json_accessor_sparse(tokens, i + 1, json_chunk, &out_accessor->sparse);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_accessor->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_accessor->extensions_count, &out_accessor->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_texture_transform(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_texture_transform* out_texture_transform)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "offset") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_texture_transform->offset, 2);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "rotation") == 0)
                {
                        ++i;
                        out_texture_transform->rotation = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "scale") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_texture_transform->scale, 2);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "texCoord") == 0)
                {
                        ++i;
                        out_texture_transform->has_texcoord = 1;
                        out_texture_transform->texcoord = cgltf_json_to_int(tokens + i, json_chunk);
                        ++i;
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_texture_view(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_texture_view* out_texture_view)
{
        (void)options;

        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        out_texture_view->scale = 1.0f;
        cgltf_fill_float_array(out_texture_view->transform.scale, 2, 1.0f);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "index") == 0)
                {
                        ++i;
                        out_texture_view->texture = CGLTF_PTRINDEX(cgltf_texture, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "texCoord") == 0)
                {
                        ++i;
                        out_texture_view->texcoord = cgltf_json_to_int(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "scale") == 0)
                {
                        ++i;
                        out_texture_view->scale = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "strength") == 0)
                {
                        ++i;
                        out_texture_view->scale = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
                        int extensions_size = tokens[i].size;

                        ++i;

                        for (int k = 0; k < extensions_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_texture_transform") == 0)
                                {
                                        out_texture_view->has_transform = 1;
                                        i = cgltf_parse_json_texture_transform(tokens, i + 1, json_chunk, &out_texture_view->transform);
                                }
                                else
                                {
                                        i = cgltf_skip_json(tokens, i + 1);
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_pbr_metallic_roughness(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_pbr_metallic_roughness* out_pbr)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "metallicFactor") == 0)
                {
                        ++i;
                        out_pbr->metallic_factor =
                                cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "roughnessFactor") == 0)
                {
                        ++i;
                        out_pbr->roughness_factor =
                                cgltf_json_to_float(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "baseColorFactor") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_pbr->base_color_factor, 4);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "baseColorTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_pbr->base_color_texture);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "metallicRoughnessTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_pbr->metallic_roughness_texture);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_pbr_specular_glossiness(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_pbr_specular_glossiness* out_pbr)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "diffuseFactor") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_pbr->diffuse_factor, 4);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularFactor") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_pbr->specular_factor, 3);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "glossinessFactor") == 0)
                {
                        ++i;
                        out_pbr->glossiness_factor = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "diffuseTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_pbr->diffuse_texture);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularGlossinessTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_pbr->specular_glossiness_texture);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_clearcoat(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_clearcoat* out_clearcoat)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatFactor") == 0)
                {
                        ++i;
                        out_clearcoat->clearcoat_factor = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatRoughnessFactor") == 0)
                {
                        ++i;
                        out_clearcoat->clearcoat_roughness_factor = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_clearcoat->clearcoat_texture);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatRoughnessTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_clearcoat->clearcoat_roughness_texture);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatNormalTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_clearcoat->clearcoat_normal_texture);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_ior(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_ior* out_ior)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;

        // Default values
        out_ior->ior = 1.5f;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "ior") == 0)
                {
                        ++i;
                        out_ior->ior = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_specular(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_specular* out_specular)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;

        // Default values
        out_specular->specular_factor = 1.0f;
        cgltf_fill_float_array(out_specular->specular_color_factor, 3, 1.0f);

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "specularFactor") == 0)
                {
                        ++i;
                        out_specular->specular_factor = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularColorFactor") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_specular->specular_color_factor, 3);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_specular->specular_texture);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "specularColorTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_specular->specular_color_texture);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_transmission(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_transmission* out_transmission)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "transmissionFactor") == 0)
                {
                        ++i;
                        out_transmission->transmission_factor = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "transmissionTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_transmission->transmission_texture);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_volume(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_volume* out_volume)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "thicknessFactor") == 0)
                {
                        ++i;
                        out_volume->thickness_factor = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "thicknessTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_volume->thickness_texture);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "attenuationColor") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_volume->attenuation_color, 3);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "attenuationDistance") == 0)
                {
                        ++i;
                        out_volume->attenuation_distance = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_sheen(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_sheen* out_sheen)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "sheenColorFactor") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_sheen->sheen_color_factor, 3);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "sheenColorTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_sheen->sheen_color_texture);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "sheenRoughnessFactor") == 0)
                {
                        ++i;
                        out_sheen->sheen_roughness_factor = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "sheenRoughnessTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_sheen->sheen_roughness_texture);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_emissive_strength(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_emissive_strength* out_emissive_strength)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;

        // Default
        out_emissive_strength->emissive_strength = 1.f;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "emissiveStrength") == 0)
                {
                        ++i;
                        out_emissive_strength->emissive_strength = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_iridescence(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_iridescence* out_iridescence)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;

        // Default
        out_iridescence->iridescence_ior = 1.3f;
        out_iridescence->iridescence_thickness_min = 100.f;
        out_iridescence->iridescence_thickness_max = 400.f;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceFactor") == 0)
                {
                        ++i;
                        out_iridescence->iridescence_factor = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_iridescence->iridescence_texture);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceIor") == 0)
                {
                        ++i;
                        out_iridescence->iridescence_ior = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceThicknessMinimum") == 0)
                {
                        ++i;
                        out_iridescence->iridescence_thickness_min = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceThicknessMaximum") == 0)
                {
                        ++i;
                        out_iridescence->iridescence_thickness_max = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "iridescenceThicknessTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_iridescence->iridescence_thickness_texture);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_diffuse_transmission(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_diffuse_transmission* out_diff_transmission)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;

        // Defaults
        cgltf_fill_float_array(out_diff_transmission->diffuse_transmission_color_factor, 3, 1.0f);
        out_diff_transmission->diffuse_transmission_factor = 0.f;
        
        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "diffuseTransmissionFactor") == 0)
                {
                        ++i;
                        out_diff_transmission->diffuse_transmission_factor = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "diffuseTransmissionTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_diff_transmission->diffuse_transmission_texture);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "diffuseTransmissionColorFactor") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_diff_transmission->diffuse_transmission_color_factor, 3);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "diffuseTransmissionColorTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_diff_transmission->diffuse_transmission_color_texture);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_anisotropy(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_anisotropy* out_anisotropy)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;


        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "anisotropyStrength") == 0)
                {
                        ++i;
                        out_anisotropy->anisotropy_strength = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "anisotropyRotation") == 0)
                {
                        ++i;
                        out_anisotropy->anisotropy_rotation = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "anisotropyTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_anisotropy->anisotropy_texture);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_dispersion(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_dispersion* out_dispersion)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
        int size = tokens[i].size;
        ++i;


        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "dispersion") == 0)
                {
                        ++i;
                        out_dispersion->dispersion = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_image(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_image* out_image)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "uri") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_image->uri);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
                {
                        ++i;
                        out_image->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "mimeType") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_image->mime_type);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_image->name);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_image->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_image->extensions_count, &out_image->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_sampler(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_sampler* out_sampler)
{
        (void)options;
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        out_sampler->wrap_s = cgltf_wrap_mode_repeat;
        out_sampler->wrap_t = cgltf_wrap_mode_repeat;

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_sampler->name);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "magFilter") == 0)
                {
                        ++i;
                        out_sampler->mag_filter
                                = (cgltf_filter_type)cgltf_json_to_int(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "minFilter") == 0)
                {
                        ++i;
                        out_sampler->min_filter
                                = (cgltf_filter_type)cgltf_json_to_int(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapS") == 0)
                {
                        ++i;
                        out_sampler->wrap_s
                                = (cgltf_wrap_mode)cgltf_json_to_int(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapT") == 0)
                {
                        ++i;
                        out_sampler->wrap_t
                                = (cgltf_wrap_mode)cgltf_json_to_int(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_sampler->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sampler->extensions_count, &out_sampler->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_texture(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_texture* out_texture)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_texture->name);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "sampler") == 0)
                {
                        ++i;
                        out_texture->sampler = CGLTF_PTRINDEX(cgltf_sampler, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "source") == 0)
                {
                        ++i;
                        out_texture->image = CGLTF_PTRINDEX(cgltf_image, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_texture->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
                        if (out_texture->extensions)
                        {
                                return CGLTF_ERROR_JSON;
                        }

                        int extensions_size = tokens[i].size;
                        ++i;
                        out_texture->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
                        out_texture->extensions_count = 0;

                        if (!out_texture->extensions)
                        {
                                return CGLTF_ERROR_NOMEM;
                        }

                        for (int k = 0; k < extensions_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_texture_basisu") == 0)
                                {
                                        out_texture->has_basisu = 1;
                                        ++i;
                                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
                                        int num_properties = tokens[i].size;
                                        ++i;

                                        for (int t = 0; t < num_properties; ++t)
                                        {
                                                CGLTF_CHECK_KEY(tokens[i]);

                                                if (cgltf_json_strcmp(tokens + i, json_chunk, "source") == 0)
                                                {
                                                        ++i;
                                                        out_texture->basisu_image = CGLTF_PTRINDEX(cgltf_image, cgltf_json_to_int(tokens + i, json_chunk));
                                                        ++i;
                                                }
                                                else
                                                {
                                                        i = cgltf_skip_json(tokens, i + 1);
                                                }
                                                if (i < 0)
                                                {
                                                        return i;
                                                }
                                        }
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "EXT_texture_webp") == 0)
                                {
                                        out_texture->has_webp = 1;
                                        ++i;
                                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
                                        int num_properties = tokens[i].size;
                                        ++i;

                                        for (int t = 0; t < num_properties; ++t)
                                        {
                                                CGLTF_CHECK_KEY(tokens[i]);

                                                if (cgltf_json_strcmp(tokens + i, json_chunk, "source") == 0)
                                                {
                                                        ++i;
                                                        out_texture->webp_image = CGLTF_PTRINDEX(cgltf_image, cgltf_json_to_int(tokens + i, json_chunk));
                                                        ++i;
                                                }
                                                else
                                                {
                                                        i = cgltf_skip_json(tokens, i + 1);
                                                }
                                                if (i < 0)
                                                {
                                                        return i;
                                                }
                                        }
                                }
                                else
                                {
                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_texture->extensions[out_texture->extensions_count++]));
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_material(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_material* out_material)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        cgltf_fill_float_array(out_material->pbr_metallic_roughness.base_color_factor, 4, 1.0f);
        out_material->pbr_metallic_roughness.metallic_factor = 1.0f;
        out_material->pbr_metallic_roughness.roughness_factor = 1.0f;

        cgltf_fill_float_array(out_material->pbr_specular_glossiness.diffuse_factor, 4, 1.0f);
        cgltf_fill_float_array(out_material->pbr_specular_glossiness.specular_factor, 3, 1.0f);
        out_material->pbr_specular_glossiness.glossiness_factor = 1.0f;

        cgltf_fill_float_array(out_material->volume.attenuation_color, 3, 1.0f);
        out_material->volume.attenuation_distance = FLT_MAX;

        out_material->alpha_cutoff = 0.5f;

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_material->name);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "pbrMetallicRoughness") == 0)
                {
                        out_material->has_pbr_metallic_roughness = 1;
                        i = cgltf_parse_json_pbr_metallic_roughness(options, tokens, i + 1, json_chunk, &out_material->pbr_metallic_roughness);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "emissiveFactor") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_material->emissive_factor, 3);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "normalTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
                                &out_material->normal_texture);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "occlusionTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
                                &out_material->occlusion_texture);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "emissiveTexture") == 0)
                {
                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
                                &out_material->emissive_texture);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "alphaMode") == 0)
                {
                        ++i;
                        if (cgltf_json_strcmp(tokens + i, json_chunk, "OPAQUE") == 0)
                        {
                                out_material->alpha_mode = cgltf_alpha_mode_opaque;
                        }
                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "MASK") == 0)
                        {
                                out_material->alpha_mode = cgltf_alpha_mode_mask;
                        }
                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "BLEND") == 0)
                        {
                                out_material->alpha_mode = cgltf_alpha_mode_blend;
                        }
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "alphaCutoff") == 0)
                {
                        ++i;
                        out_material->alpha_cutoff = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "doubleSided") == 0)
                {
                        ++i;
                        out_material->double_sided =
                                cgltf_json_to_bool(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_material->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
                        if(out_material->extensions)
                        {
                                return CGLTF_ERROR_JSON;
                        }

                        int extensions_size = tokens[i].size;
                        ++i;
                        out_material->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
                        out_material->extensions_count= 0;

                        if (!out_material->extensions)
                        {
                                return CGLTF_ERROR_NOMEM;
                        }

                        for (int k = 0; k < extensions_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_pbrSpecularGlossiness") == 0)
                                {
                                        out_material->has_pbr_specular_glossiness = 1;
                                        i = cgltf_parse_json_pbr_specular_glossiness(options, tokens, i + 1, json_chunk, &out_material->pbr_specular_glossiness);
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_unlit") == 0)
                                {
                                        out_material->unlit = 1;
                                        i = cgltf_skip_json(tokens, i+1);
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_clearcoat") == 0)
                                {
                                        out_material->has_clearcoat = 1;
                                        i = cgltf_parse_json_clearcoat(options, tokens, i + 1, json_chunk, &out_material->clearcoat);
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_ior") == 0)
                                {
                                        out_material->has_ior = 1;
                                        i = cgltf_parse_json_ior(tokens, i + 1, json_chunk, &out_material->ior);
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_specular") == 0)
                                {
                                        out_material->has_specular = 1;
                                        i = cgltf_parse_json_specular(options, tokens, i + 1, json_chunk, &out_material->specular);
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_transmission") == 0)
                                {
                                        out_material->has_transmission = 1;
                                        i = cgltf_parse_json_transmission(options, tokens, i + 1, json_chunk, &out_material->transmission);
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_materials_volume") == 0)
                                {
                                        out_material->has_volume = 1;
                                        i = cgltf_parse_json_volume(options, tokens, i + 1, json_chunk, &out_material->volume);
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_sheen") == 0)
                                {
                                        out_material->has_sheen = 1;
                                        i = cgltf_parse_json_sheen(options, tokens, i + 1, json_chunk, &out_material->sheen);
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_materials_emissive_strength") == 0)
                                {
                                        out_material->has_emissive_strength = 1;
                                        i = cgltf_parse_json_emissive_strength(tokens, i + 1, json_chunk, &out_material->emissive_strength);
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_materials_iridescence") == 0)
                                {
                                        out_material->has_iridescence = 1;
                                        i = cgltf_parse_json_iridescence(options, tokens, i + 1, json_chunk, &out_material->iridescence);
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_materials_diffuse_transmission") == 0)
                                {
                                        out_material->has_diffuse_transmission = 1;
                                        i = cgltf_parse_json_diffuse_transmission(options, tokens, i + 1, json_chunk, &out_material->diffuse_transmission);
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_materials_anisotropy") == 0)
                                {
                                        out_material->has_anisotropy = 1;
                                        i = cgltf_parse_json_anisotropy(options, tokens, i + 1, json_chunk, &out_material->anisotropy);
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_materials_dispersion") == 0)
                                {
                                        out_material->has_dispersion = 1;
                                        i = cgltf_parse_json_dispersion(tokens, i + 1, json_chunk, &out_material->dispersion);
                                }
                                else
                                {
                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_material->extensions[out_material->extensions_count++]));
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_accessors(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_accessor), (void**)&out_data->accessors, &out_data->accessors_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->accessors_count; ++j)
        {
                i = cgltf_parse_json_accessor(options, tokens, i, json_chunk, &out_data->accessors[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_materials(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_material), (void**)&out_data->materials, &out_data->materials_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->materials_count; ++j)
        {
                i = cgltf_parse_json_material(options, tokens, i, json_chunk, &out_data->materials[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_images(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_image), (void**)&out_data->images, &out_data->images_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->images_count; ++j)
        {
                i = cgltf_parse_json_image(options, tokens, i, json_chunk, &out_data->images[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_textures(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_texture), (void**)&out_data->textures, &out_data->textures_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->textures_count; ++j)
        {
                i = cgltf_parse_json_texture(options, tokens, i, json_chunk, &out_data->textures[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_samplers(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_sampler), (void**)&out_data->samplers, &out_data->samplers_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->samplers_count; ++j)
        {
                i = cgltf_parse_json_sampler(options, tokens, i, json_chunk, &out_data->samplers[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_meshopt_compression(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_meshopt_compression* out_meshopt_compression)
{
        (void)options;
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "buffer") == 0)
                {
                        ++i;
                        out_meshopt_compression->buffer = CGLTF_PTRINDEX(cgltf_buffer, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
                {
                        ++i;
                        out_meshopt_compression->offset = cgltf_json_to_size(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteLength") == 0)
                {
                        ++i;
                        out_meshopt_compression->size = cgltf_json_to_size(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteStride") == 0)
                {
                        ++i;
                        out_meshopt_compression->stride = cgltf_json_to_size(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
                {
                        ++i;
                        out_meshopt_compression->count = cgltf_json_to_size(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "mode") == 0)
                {
                        ++i;
                        if (cgltf_json_strcmp(tokens+i, json_chunk, "ATTRIBUTES") == 0)
                        {
                                out_meshopt_compression->mode = cgltf_meshopt_compression_mode_attributes;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "TRIANGLES") == 0)
                        {
                                out_meshopt_compression->mode = cgltf_meshopt_compression_mode_triangles;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "INDICES") == 0)
                        {
                                out_meshopt_compression->mode = cgltf_meshopt_compression_mode_indices;
                        }
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "filter") == 0)
                {
                        ++i;
                        if (cgltf_json_strcmp(tokens+i, json_chunk, "NONE") == 0)
                        {
                                out_meshopt_compression->filter = cgltf_meshopt_compression_filter_none;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "OCTAHEDRAL") == 0)
                        {
                                out_meshopt_compression->filter = cgltf_meshopt_compression_filter_octahedral;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "QUATERNION") == 0)
                        {
                                out_meshopt_compression->filter = cgltf_meshopt_compression_filter_quaternion;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "EXPONENTIAL") == 0)
                        {
                                out_meshopt_compression->filter = cgltf_meshopt_compression_filter_exponential;
                        }
                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "COLOR") == 0)
                        {
                                out_meshopt_compression->filter = cgltf_meshopt_compression_filter_color;
                        }
                        ++i;
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_buffer_view(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_buffer_view* out_buffer_view)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_buffer_view->name);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "buffer") == 0)
                {
                        ++i;
                        out_buffer_view->buffer = CGLTF_PTRINDEX(cgltf_buffer, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
                {
                        ++i;
                        out_buffer_view->offset =
                                        cgltf_json_to_size(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteLength") == 0)
                {
                        ++i;
                        out_buffer_view->size =
                                        cgltf_json_to_size(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteStride") == 0)
                {
                        ++i;
                        out_buffer_view->stride =
                                        cgltf_json_to_size(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "target") == 0)
                {
                        ++i;
                        int type = cgltf_json_to_int(tokens+i, json_chunk);
                        switch (type)
                        {
                        case 34962:
                                type = cgltf_buffer_view_type_vertices;
                                break;
                        case 34963:
                                type = cgltf_buffer_view_type_indices;
                                break;
                        default:
                                type = cgltf_buffer_view_type_invalid;
                                break;
                        }
                        out_buffer_view->type = (cgltf_buffer_view_type)type;
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_buffer_view->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
                        if(out_buffer_view->extensions)
                        {
                                return CGLTF_ERROR_JSON;
                        }

                        int extensions_size = tokens[i].size;
                        out_buffer_view->extensions_count = 0;
                        out_buffer_view->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);

                        if (!out_buffer_view->extensions)
                        {
                                return CGLTF_ERROR_NOMEM;
                        }

                        ++i;
                        for (int k = 0; k < extensions_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "EXT_meshopt_compression") == 0)
                                {
                                        out_buffer_view->has_meshopt_compression = 1;
                                        i = cgltf_parse_json_meshopt_compression(options, tokens, i + 1, json_chunk, &out_buffer_view->meshopt_compression);
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_meshopt_compression") == 0)
                                {
                                        out_buffer_view->has_meshopt_compression = 1;
                                        out_buffer_view->meshopt_compression.is_khr = 1;
                                        i = cgltf_parse_json_meshopt_compression(options, tokens, i + 1, json_chunk, &out_buffer_view->meshopt_compression);
                                }
                                else
                                {
                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_buffer_view->extensions[out_buffer_view->extensions_count++]));
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_buffer_views(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_buffer_view), (void**)&out_data->buffer_views, &out_data->buffer_views_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->buffer_views_count; ++j)
        {
                i = cgltf_parse_json_buffer_view(options, tokens, i, json_chunk, &out_data->buffer_views[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_buffer(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_buffer* out_buffer)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_buffer->name);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteLength") == 0)
                {
                        ++i;
                        out_buffer->size =
                                        cgltf_json_to_size(tokens+i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "uri") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_buffer->uri);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_buffer->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_buffer->extensions_count, &out_buffer->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_buffers(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_buffer), (void**)&out_data->buffers, &out_data->buffers_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->buffers_count; ++j)
        {
                i = cgltf_parse_json_buffer(options, tokens, i, json_chunk, &out_data->buffers[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_skin(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_skin* out_skin)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_skin->name);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "joints") == 0)
                {
                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_node*), (void**)&out_skin->joints, &out_skin->joints_count);
                        if (i < 0)
                        {
                                return i;
                        }

                        for (cgltf_size k = 0; k < out_skin->joints_count; ++k)
                        {
                                out_skin->joints[k] = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
                                ++i;
                        }
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "skeleton") == 0)
                {
                        ++i;
                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
                        out_skin->skeleton = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "inverseBindMatrices") == 0)
                {
                        ++i;
                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
                        out_skin->inverse_bind_matrices = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_skin->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_skin->extensions_count, &out_skin->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_skins(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_skin), (void**)&out_data->skins, &out_data->skins_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->skins_count; ++j)
        {
                i = cgltf_parse_json_skin(options, tokens, i, json_chunk, &out_data->skins[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_camera(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_camera* out_camera)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_camera->name);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "perspective") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

                        int data_size = tokens[i].size;
                        ++i;

                        if (out_camera->type != cgltf_camera_type_invalid)
                        {
                                return CGLTF_ERROR_JSON;
                        }

                        out_camera->type = cgltf_camera_type_perspective;

                        for (int k = 0; k < data_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "aspectRatio") == 0)
                                {
                                        ++i;
                                        out_camera->data.perspective.has_aspect_ratio = 1;
                                        out_camera->data.perspective.aspect_ratio = cgltf_json_to_float(tokens + i, json_chunk);
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "yfov") == 0)
                                {
                                        ++i;
                                        out_camera->data.perspective.yfov = cgltf_json_to_float(tokens + i, json_chunk);
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "zfar") == 0)
                                {
                                        ++i;
                                        out_camera->data.perspective.has_zfar = 1;
                                        out_camera->data.perspective.zfar = cgltf_json_to_float(tokens + i, json_chunk);
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "znear") == 0)
                                {
                                        ++i;
                                        out_camera->data.perspective.znear = cgltf_json_to_float(tokens + i, json_chunk);
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                                {
                                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_camera->data.perspective.extras);
                                }
                                else
                                {
                                        i = cgltf_skip_json(tokens, i+1);
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "orthographic") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

                        int data_size = tokens[i].size;
                        ++i;

                        if (out_camera->type != cgltf_camera_type_invalid)
                        {
                                return CGLTF_ERROR_JSON;
                        }

                        out_camera->type = cgltf_camera_type_orthographic;

                        for (int k = 0; k < data_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "xmag") == 0)
                                {
                                        ++i;
                                        out_camera->data.orthographic.xmag = cgltf_json_to_float(tokens + i, json_chunk);
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "ymag") == 0)
                                {
                                        ++i;
                                        out_camera->data.orthographic.ymag = cgltf_json_to_float(tokens + i, json_chunk);
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "zfar") == 0)
                                {
                                        ++i;
                                        out_camera->data.orthographic.zfar = cgltf_json_to_float(tokens + i, json_chunk);
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "znear") == 0)
                                {
                                        ++i;
                                        out_camera->data.orthographic.znear = cgltf_json_to_float(tokens + i, json_chunk);
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                                {
                                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_camera->data.orthographic.extras);
                                }
                                else
                                {
                                        i = cgltf_skip_json(tokens, i+1);
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_camera->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_camera->extensions_count, &out_camera->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_cameras(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_camera), (void**)&out_data->cameras, &out_data->cameras_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->cameras_count; ++j)
        {
                i = cgltf_parse_json_camera(options, tokens, i, json_chunk, &out_data->cameras[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_light(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_light* out_light)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        out_light->color[0] = 1.f;
        out_light->color[1] = 1.f;
        out_light->color[2] = 1.f;
        out_light->intensity = 1.f;

        out_light->spot_inner_cone_angle = 0.f;
        out_light->spot_outer_cone_angle = 3.1415926535f / 4.0f;

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_light->name);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "color") == 0)
                {
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_light->color, 3);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "intensity") == 0)
                {
                        ++i;
                        out_light->intensity = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "type") == 0)
                {
                        ++i;
                        if (cgltf_json_strcmp(tokens + i, json_chunk, "directional") == 0)
                        {
                                out_light->type = cgltf_light_type_directional;
                        }
                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "point") == 0)
                        {
                                out_light->type = cgltf_light_type_point;
                        }
                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "spot") == 0)
                        {
                                out_light->type = cgltf_light_type_spot;
                        }
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "range") == 0)
                {
                        ++i;
                        out_light->range = cgltf_json_to_float(tokens + i, json_chunk);
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "spot") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

                        int data_size = tokens[i].size;
                        ++i;

                        for (int k = 0; k < data_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "innerConeAngle") == 0)
                                {
                                        ++i;
                                        out_light->spot_inner_cone_angle = cgltf_json_to_float(tokens + i, json_chunk);
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "outerConeAngle") == 0)
                                {
                                        ++i;
                                        out_light->spot_outer_cone_angle = cgltf_json_to_float(tokens + i, json_chunk);
                                        ++i;
                                }
                                else
                                {
                                        i = cgltf_skip_json(tokens, i+1);
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_light->extras);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_lights(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_light), (void**)&out_data->lights, &out_data->lights_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->lights_count; ++j)
        {
                i = cgltf_parse_json_light(options, tokens, i, json_chunk, &out_data->lights[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_node(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_node* out_node)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        out_node->rotation[3] = 1.0f;
        out_node->scale[0] = 1.0f;
        out_node->scale[1] = 1.0f;
        out_node->scale[2] = 1.0f;
        out_node->matrix[0] = 1.0f;
        out_node->matrix[5] = 1.0f;
        out_node->matrix[10] = 1.0f;
        out_node->matrix[15] = 1.0f;

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_node->name);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "children") == 0)
                {
                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_node*), (void**)&out_node->children, &out_node->children_count);
                        if (i < 0)
                        {
                                return i;
                        }

                        for (cgltf_size k = 0; k < out_node->children_count; ++k)
                        {
                                out_node->children[k] = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
                                ++i;
                        }
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "mesh") == 0)
                {
                        ++i;
                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
                        out_node->mesh = CGLTF_PTRINDEX(cgltf_mesh, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "skin") == 0)
                {
                        ++i;
                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
                        out_node->skin = CGLTF_PTRINDEX(cgltf_skin, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "camera") == 0)
                {
                        ++i;
                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
                        out_node->camera = CGLTF_PTRINDEX(cgltf_camera, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "translation") == 0)
                {
                        out_node->has_translation = 1;
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->translation, 3);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "rotation") == 0)
                {
                        out_node->has_rotation = 1;
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->rotation, 4);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "scale") == 0)
                {
                        out_node->has_scale = 1;
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->scale, 3);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "matrix") == 0)
                {
                        out_node->has_matrix = 1;
                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->matrix, 16);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "weights") == 0)
                {
                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_float), (void**)&out_node->weights, &out_node->weights_count);
                        if (i < 0)
                        {
                                return i;
                        }

                        i = cgltf_parse_json_float_array(tokens, i - 1, json_chunk, out_node->weights, (int)out_node->weights_count);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_node->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
                        if(out_node->extensions)
                        {
                                return CGLTF_ERROR_JSON;
                        }

                        int extensions_size = tokens[i].size;
                        out_node->extensions_count= 0;
                        out_node->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);

                        if (!out_node->extensions)
                        {
                                return CGLTF_ERROR_NOMEM;
                        }

                        ++i;

                        for (int k = 0; k < extensions_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_lights_punctual") == 0)
                                {
                                        ++i;

                                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

                                        int data_size = tokens[i].size;
                                        ++i;

                                        for (int m = 0; m < data_size; ++m)
                                        {
                                                CGLTF_CHECK_KEY(tokens[i]);

                                                if (cgltf_json_strcmp(tokens + i, json_chunk, "light") == 0)
                                                {
                                                        ++i;
                                                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
                                                        out_node->light = CGLTF_PTRINDEX(cgltf_light, cgltf_json_to_int(tokens + i, json_chunk));
                                                        ++i;
                                                }
                                                else
                                                {
                                                        i = cgltf_skip_json(tokens, i + 1);
                                                }

                                                if (i < 0)
                                                {
                                                        return i;
                                                }
                                        }
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "EXT_mesh_gpu_instancing") == 0)
                                {
                                        out_node->has_mesh_gpu_instancing = 1;
                                        i = cgltf_parse_json_mesh_gpu_instancing(options, tokens, i + 1, json_chunk, &out_node->mesh_gpu_instancing);
                                }
                                else
                                {
                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_node->extensions[out_node->extensions_count++]));
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_nodes(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_node), (void**)&out_data->nodes, &out_data->nodes_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->nodes_count; ++j)
        {
                i = cgltf_parse_json_node(options, tokens, i, json_chunk, &out_data->nodes[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_scene(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_scene* out_scene)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_scene->name);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "nodes") == 0)
                {
                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_node*), (void**)&out_scene->nodes, &out_scene->nodes_count);
                        if (i < 0)
                        {
                                return i;
                        }

                        for (cgltf_size k = 0; k < out_scene->nodes_count; ++k)
                        {
                                out_scene->nodes[k] = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
                                ++i;
                        }
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_scene->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_scene->extensions_count, &out_scene->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_scenes(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_scene), (void**)&out_data->scenes, &out_data->scenes_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->scenes_count; ++j)
        {
                i = cgltf_parse_json_scene(options, tokens, i, json_chunk, &out_data->scenes[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_animation_sampler(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_animation_sampler* out_sampler)
{
        (void)options;
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "input") == 0)
                {
                        ++i;
                        out_sampler->input = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "output") == 0)
                {
                        ++i;
                        out_sampler->output = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "interpolation") == 0)
                {
                        ++i;
                        if (cgltf_json_strcmp(tokens + i, json_chunk, "LINEAR") == 0)
                        {
                                out_sampler->interpolation = cgltf_interpolation_type_linear;
                        }
                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "STEP") == 0)
                        {
                                out_sampler->interpolation = cgltf_interpolation_type_step;
                        }
                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "CUBICSPLINE") == 0)
                        {
                                out_sampler->interpolation = cgltf_interpolation_type_cubic_spline;
                        }
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_sampler->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sampler->extensions_count, &out_sampler->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_animation_channel(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_animation_channel* out_channel)
{
        (void)options;
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "sampler") == 0)
                {
                        ++i;
                        out_channel->sampler = CGLTF_PTRINDEX(cgltf_animation_sampler, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "target") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

                        int target_size = tokens[i].size;
                        ++i;

                        for (int k = 0; k < target_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "node") == 0)
                                {
                                        ++i;
                                        out_channel->target_node = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "path") == 0)
                                {
                                        ++i;
                                        if (cgltf_json_strcmp(tokens+i, json_chunk, "translation") == 0)
                                        {
                                                out_channel->target_path = cgltf_animation_path_type_translation;
                                        }
                                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "rotation") == 0)
                                        {
                                                out_channel->target_path = cgltf_animation_path_type_rotation;
                                        }
                                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "scale") == 0)
                                        {
                                                out_channel->target_path = cgltf_animation_path_type_scale;
                                        }
                                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "weights") == 0)
                                        {
                                                out_channel->target_path = cgltf_animation_path_type_weights;
                                        }
                                        ++i;
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                                {
                                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_channel->extras);
                                }
                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                                {
                                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_channel->extensions_count, &out_channel->extensions);
                                }
                                else
                                {
                                        i = cgltf_skip_json(tokens, i+1);
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_animation(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_animation* out_animation)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_animation->name);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "samplers") == 0)
                {
                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_animation_sampler), (void**)&out_animation->samplers, &out_animation->samplers_count);
                        if (i < 0)
                        {
                                return i;
                        }

                        for (cgltf_size k = 0; k < out_animation->samplers_count; ++k)
                        {
                                i = cgltf_parse_json_animation_sampler(options, tokens, i, json_chunk, &out_animation->samplers[k]);
                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "channels") == 0)
                {
                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_animation_channel), (void**)&out_animation->channels, &out_animation->channels_count);
                        if (i < 0)
                        {
                                return i;
                        }

                        for (cgltf_size k = 0; k < out_animation->channels_count; ++k)
                        {
                                i = cgltf_parse_json_animation_channel(options, tokens, i, json_chunk, &out_animation->channels[k]);
                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_animation->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_animation->extensions_count, &out_animation->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_animations(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_animation), (void**)&out_data->animations, &out_data->animations_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->animations_count; ++j)
        {
                i = cgltf_parse_json_animation(options, tokens, i, json_chunk, &out_data->animations[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_variant(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_material_variant* out_variant)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_variant->name);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_variant->extras);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

static int cgltf_parse_json_variants(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_material_variant), (void**)&out_data->variants, &out_data->variants_count);
        if (i < 0)
        {
                return i;
        }

        for (cgltf_size j = 0; j < out_data->variants_count; ++j)
        {
                i = cgltf_parse_json_variant(options, tokens, i, json_chunk, &out_data->variants[j]);
                if (i < 0)
                {
                        return i;
                }
        }
        return i;
}

static int cgltf_parse_json_asset(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_asset* out_asset)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens+i, json_chunk, "copyright") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->copyright);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "generator") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->generator);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "version") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->version);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "minVersion") == 0)
                {
                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->min_version);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_asset->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_asset->extensions_count, &out_asset->extensions);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i+1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        if (out_asset->version && CGLTF_ATOF(out_asset->version) < 2)
        {
                return CGLTF_ERROR_LEGACY;
        }

        return i;
}

cgltf_size cgltf_num_components(cgltf_type type) {
        switch (type)
        {
        case cgltf_type_vec2:
                return 2;
        case cgltf_type_vec3:
                return 3;
        case cgltf_type_vec4:
                return 4;
        case cgltf_type_mat2:
                return 4;
        case cgltf_type_mat3:
                return 9;
        case cgltf_type_mat4:
                return 16;
        case cgltf_type_invalid:
        case cgltf_type_scalar:
        default:
                return 1;
        }
}

cgltf_size cgltf_component_size(cgltf_component_type component_type) {
        switch (component_type)
        {
        case cgltf_component_type_r_8:
        case cgltf_component_type_r_8u:
                return 1;
        case cgltf_component_type_r_16:
        case cgltf_component_type_r_16u:
                return 2;
        case cgltf_component_type_r_32u:
        case cgltf_component_type_r_32f:
                return 4;
        case cgltf_component_type_invalid:
        default:
                return 0;
        }
}

cgltf_size cgltf_calc_size(cgltf_type type, cgltf_component_type component_type)
{
        cgltf_size component_size = cgltf_component_size(component_type);
        if (type == cgltf_type_mat2 && component_size == 1)
        {
                return 8 * component_size;
        }
        else if (type == cgltf_type_mat3 && (component_size == 1 || component_size == 2))
        {
                return 12 * component_size;
        }
        return component_size * cgltf_num_components(type);
}

static int cgltf_fixup_pointers(cgltf_data* out_data);

static int cgltf_parse_json_root(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
{
        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

        int size = tokens[i].size;
        ++i;

        for (int j = 0; j < size; ++j)
        {
                CGLTF_CHECK_KEY(tokens[i]);

                if (cgltf_json_strcmp(tokens + i, json_chunk, "asset") == 0)
                {
                        i = cgltf_parse_json_asset(options, tokens, i + 1, json_chunk, &out_data->asset);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "meshes") == 0)
                {
                        i = cgltf_parse_json_meshes(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "accessors") == 0)
                {
                        i = cgltf_parse_json_accessors(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "bufferViews") == 0)
                {
                        i = cgltf_parse_json_buffer_views(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "buffers") == 0)
                {
                        i = cgltf_parse_json_buffers(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "materials") == 0)
                {
                        i = cgltf_parse_json_materials(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "images") == 0)
                {
                        i = cgltf_parse_json_images(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "textures") == 0)
                {
                        i = cgltf_parse_json_textures(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "samplers") == 0)
                {
                        i = cgltf_parse_json_samplers(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "skins") == 0)
                {
                        i = cgltf_parse_json_skins(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "cameras") == 0)
                {
                        i = cgltf_parse_json_cameras(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "nodes") == 0)
                {
                        i = cgltf_parse_json_nodes(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "scenes") == 0)
                {
                        i = cgltf_parse_json_scenes(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "scene") == 0)
                {
                        ++i;
                        out_data->scene = CGLTF_PTRINDEX(cgltf_scene, cgltf_json_to_int(tokens + i, json_chunk));
                        ++i;
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "animations") == 0)
                {
                        i = cgltf_parse_json_animations(options, tokens, i + 1, json_chunk, out_data);
                }
                else if (cgltf_json_strcmp(tokens+i, json_chunk, "extras") == 0)
                {
                        i = cgltf_parse_json_extras(options, tokens, i + 1, json_chunk, &out_data->extras);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
                {
                        ++i;

                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
                        if(out_data->data_extensions)
                        {
                                return CGLTF_ERROR_JSON;
                        }

                        int extensions_size = tokens[i].size;
                        out_data->data_extensions_count = 0;
                        out_data->data_extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);

                        if (!out_data->data_extensions)
                        {
                                return CGLTF_ERROR_NOMEM;
                        }

                        ++i;

                        for (int k = 0; k < extensions_size; ++k)
                        {
                                CGLTF_CHECK_KEY(tokens[i]);

                                if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_lights_punctual") == 0)
                                {
                                        ++i;

                                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

                                        int data_size = tokens[i].size;
                                        ++i;

                                        for (int m = 0; m < data_size; ++m)
                                        {
                                                CGLTF_CHECK_KEY(tokens[i]);

                                                if (cgltf_json_strcmp(tokens + i, json_chunk, "lights") == 0)
                                                {
                                                        i = cgltf_parse_json_lights(options, tokens, i + 1, json_chunk, out_data);
                                                }
                                                else
                                                {
                                                        i = cgltf_skip_json(tokens, i + 1);
                                                }

                                                if (i < 0)
                                                {
                                                        return i;
                                                }
                                        }
                                }
                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_variants") == 0)
                                {
                                        ++i;

                                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);

                                        int data_size = tokens[i].size;
                                        ++i;

                                        for (int m = 0; m < data_size; ++m)
                                        {
                                                CGLTF_CHECK_KEY(tokens[i]);

                                                if (cgltf_json_strcmp(tokens + i, json_chunk, "variants") == 0)
                                                {
                                                        i = cgltf_parse_json_variants(options, tokens, i + 1, json_chunk, out_data);
                                                }
                                                else
                                                {
                                                        i = cgltf_skip_json(tokens, i + 1);
                                                }

                                                if (i < 0)
                                                {
                                                        return i;
                                                }
                                        }
                                }
                                else
                                {
                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_data->data_extensions[out_data->data_extensions_count++]));
                                }

                                if (i < 0)
                                {
                                        return i;
                                }
                        }
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensionsUsed") == 0)
                {
                        i = cgltf_parse_json_string_array(options, tokens, i + 1, json_chunk, &out_data->extensions_used, &out_data->extensions_used_count);
                }
                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensionsRequired") == 0)
                {
                        i = cgltf_parse_json_string_array(options, tokens, i + 1, json_chunk, &out_data->extensions_required, &out_data->extensions_required_count);
                }
                else
                {
                        i = cgltf_skip_json(tokens, i + 1);
                }

                if (i < 0)
                {
                        return i;
                }
        }

        return i;
}

cgltf_result cgltf_parse_json(cgltf_options* options, const uint8_t* json_chunk, cgltf_size size, cgltf_data** out_data)
{
        jsmn_parser parser = { 0, 0, 0 };

        if (options->json_token_count == 0)
        {
                int token_count = jsmn_parse(&parser, (const char*)json_chunk, size, NULL, 0);

                if (token_count <= 0)
                {
                        return cgltf_result_invalid_json;
                }

                options->json_token_count = token_count;
        }

        jsmntok_t* tokens = (jsmntok_t*)options->memory.alloc_func(options->memory.user_data, sizeof(jsmntok_t) * (options->json_token_count + 1));

        if (!tokens)
        {
                return cgltf_result_out_of_memory;
        }

        jsmn_init(&parser);

        int token_count = jsmn_parse(&parser, (const char*)json_chunk, size, tokens, options->json_token_count);

        if (token_count <= 0)
        {
                options->memory.free_func(options->memory.user_data, tokens);
                return cgltf_result_invalid_json;
        }

        // this makes sure that we always have an UNDEFINED token at the end of the stream
        // for invalid JSON inputs this makes sure we don't perform out of bound reads of token data
        tokens[token_count].type = JSMN_UNDEFINED;

        cgltf_data* data = (cgltf_data*)options->memory.alloc_func(options->memory.user_data, sizeof(cgltf_data));

        if (!data)
        {
                options->memory.free_func(options->memory.user_data, tokens);
                return cgltf_result_out_of_memory;
        }

        memset(data, 0, sizeof(cgltf_data));
        data->memory = options->memory;
        data->file = options->file;

        int i = cgltf_parse_json_root(options, tokens, 0, json_chunk, data);

        options->memory.free_func(options->memory.user_data, tokens);

        if (i < 0)
        {
                cgltf_free(data);

                switch (i)
                {
                case CGLTF_ERROR_NOMEM: return cgltf_result_out_of_memory;
                case CGLTF_ERROR_LEGACY: return cgltf_result_legacy_gltf;
                default: return cgltf_result_invalid_gltf;
                }
        }

        if (cgltf_fixup_pointers(data) < 0)
        {
                cgltf_free(data);
                return cgltf_result_invalid_gltf;
        }

        data->json = (const char*)json_chunk;
        data->json_size = size;

        *out_data = data;

        return cgltf_result_success;
}

static int cgltf_fixup_pointers(cgltf_data* data)
{
        for (cgltf_size i = 0; i < data->meshes_count; ++i)
        {
                for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
                {
                        CGLTF_PTRFIXUP(data->meshes[i].primitives[j].indices, data->accessors, data->accessors_count);
                        CGLTF_PTRFIXUP(data->meshes[i].primitives[j].material, data->materials, data->materials_count);

                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
                        {
                                CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].attributes[k].data, data->accessors, data->accessors_count);
                        }

                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
                        {
                                for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
                                {
                                        CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].targets[k].attributes[m].data, data->accessors, data->accessors_count);
                                }
                        }

                        if (data->meshes[i].primitives[j].has_draco_mesh_compression)
                        {
                                CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].draco_mesh_compression.buffer_view, data->buffer_views, data->buffer_views_count);
                                for (cgltf_size m = 0; m < data->meshes[i].primitives[j].draco_mesh_compression.attributes_count; ++m)
                                {
                                        CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].draco_mesh_compression.attributes[m].data, data->accessors, data->accessors_count);
                                }
                        }

                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].mappings_count; ++k)
                        {
                                CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].mappings[k].material, data->materials, data->materials_count);
                        }
                }
        }

        for (cgltf_size i = 0; i < data->accessors_count; ++i)
        {
                CGLTF_PTRFIXUP(data->accessors[i].buffer_view, data->buffer_views, data->buffer_views_count);

                if (data->accessors[i].is_sparse)
                {
                        CGLTF_PTRFIXUP_REQ(data->accessors[i].sparse.indices_buffer_view, data->buffer_views, data->buffer_views_count);
                        CGLTF_PTRFIXUP_REQ(data->accessors[i].sparse.values_buffer_view, data->buffer_views, data->buffer_views_count);
                }

                if (data->accessors[i].buffer_view)
                {
                        data->accessors[i].stride = data->accessors[i].buffer_view->stride;
                }

                if (data->accessors[i].stride == 0)
                {
                        data->accessors[i].stride = cgltf_calc_size(data->accessors[i].type, data->accessors[i].component_type);
                }
        }

        for (cgltf_size i = 0; i < data->textures_count; ++i)
        {
                CGLTF_PTRFIXUP(data->textures[i].image, data->images, data->images_count);
                CGLTF_PTRFIXUP(data->textures[i].basisu_image, data->images, data->images_count);
                CGLTF_PTRFIXUP(data->textures[i].webp_image, data->images, data->images_count);
                CGLTF_PTRFIXUP(data->textures[i].sampler, data->samplers, data->samplers_count);
        }

        for (cgltf_size i = 0; i < data->images_count; ++i)
        {
                CGLTF_PTRFIXUP(data->images[i].buffer_view, data->buffer_views, data->buffer_views_count);
        }

        for (cgltf_size i = 0; i < data->materials_count; ++i)
        {
                CGLTF_PTRFIXUP(data->materials[i].normal_texture.texture, data->textures, data->textures_count);
                CGLTF_PTRFIXUP(data->materials[i].emissive_texture.texture, data->textures, data->textures_count);
                CGLTF_PTRFIXUP(data->materials[i].occlusion_texture.texture, data->textures, data->textures_count);

                CGLTF_PTRFIXUP(data->materials[i].pbr_metallic_roughness.base_color_texture.texture, data->textures, data->textures_count);
                CGLTF_PTRFIXUP(data->materials[i].pbr_metallic_roughness.metallic_roughness_texture.texture, data->textures, data->textures_count);

                CGLTF_PTRFIXUP(data->materials[i].pbr_specular_glossiness.diffuse_texture.texture, data->textures, data->textures_count);
                CGLTF_PTRFIXUP(data->materials[i].pbr_specular_glossiness.specular_glossiness_texture.texture, data->textures, data->textures_count);

                CGLTF_PTRFIXUP(data->materials[i].clearcoat.clearcoat_texture.texture, data->textures, data->textures_count);
                CGLTF_PTRFIXUP(data->materials[i].clearcoat.clearcoat_roughness_texture.texture, data->textures, data->textures_count);
                CGLTF_PTRFIXUP(data->materials[i].clearcoat.clearcoat_normal_texture.texture, data->textures, data->textures_count);

                CGLTF_PTRFIXUP(data->materials[i].specular.specular_texture.texture, data->textures, data->textures_count);
                CGLTF_PTRFIXUP(data->materials[i].specular.specular_color_texture.texture, data->textures, data->textures_count);

                CGLTF_PTRFIXUP(data->materials[i].transmission.transmission_texture.texture, data->textures, data->textures_count);

                CGLTF_PTRFIXUP(data->materials[i].volume.thickness_texture.texture, data->textures, data->textures_count);

                CGLTF_PTRFIXUP(data->materials[i].sheen.sheen_color_texture.texture, data->textures, data->textures_count);
                CGLTF_PTRFIXUP(data->materials[i].sheen.sheen_roughness_texture.texture, data->textures, data->textures_count);

                CGLTF_PTRFIXUP(data->materials[i].iridescence.iridescence_texture.texture, data->textures, data->textures_count);
                CGLTF_PTRFIXUP(data->materials[i].iridescence.iridescence_thickness_texture.texture, data->textures, data->textures_count);

                CGLTF_PTRFIXUP(data->materials[i].diffuse_transmission.diffuse_transmission_texture.texture, data->textures, data->textures_count);
                CGLTF_PTRFIXUP(data->materials[i].diffuse_transmission.diffuse_transmission_color_texture.texture, data->textures, data->textures_count);

                CGLTF_PTRFIXUP(data->materials[i].anisotropy.anisotropy_texture.texture, data->textures, data->textures_count);
        }

        for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
        {
                CGLTF_PTRFIXUP_REQ(data->buffer_views[i].buffer, data->buffers, data->buffers_count);

                if (data->buffer_views[i].has_meshopt_compression)
                {
                        CGLTF_PTRFIXUP_REQ(data->buffer_views[i].meshopt_compression.buffer, data->buffers, data->buffers_count);
                }
        }

        for (cgltf_size i = 0; i < data->skins_count; ++i)
        {
                for (cgltf_size j = 0; j < data->skins[i].joints_count; ++j)
                {
                        CGLTF_PTRFIXUP_REQ(data->skins[i].joints[j], data->nodes, data->nodes_count);
                }

                CGLTF_PTRFIXUP(data->skins[i].skeleton, data->nodes, data->nodes_count);
                CGLTF_PTRFIXUP(data->skins[i].inverse_bind_matrices, data->accessors, data->accessors_count);
        }

        for (cgltf_size i = 0; i < data->nodes_count; ++i)
        {
                for (cgltf_size j = 0; j < data->nodes[i].children_count; ++j)
                {
                        CGLTF_PTRFIXUP_REQ(data->nodes[i].children[j], data->nodes, data->nodes_count);

                        if (data->nodes[i].children[j]->parent)
                        {
                                return CGLTF_ERROR_JSON;
                        }

                        data->nodes[i].children[j]->parent = &data->nodes[i];
                }

                CGLTF_PTRFIXUP(data->nodes[i].mesh, data->meshes, data->meshes_count);
                CGLTF_PTRFIXUP(data->nodes[i].skin, data->skins, data->skins_count);
                CGLTF_PTRFIXUP(data->nodes[i].camera, data->cameras, data->cameras_count);
                CGLTF_PTRFIXUP(data->nodes[i].light, data->lights, data->lights_count);

                if (data->nodes[i].has_mesh_gpu_instancing)
                {
                        for (cgltf_size m = 0; m < data->nodes[i].mesh_gpu_instancing.attributes_count; ++m)
                        {
                                CGLTF_PTRFIXUP_REQ(data->nodes[i].mesh_gpu_instancing.attributes[m].data, data->accessors, data->accessors_count);
                        }
                }
        }

        for (cgltf_size i = 0; i < data->scenes_count; ++i)
        {
                for (cgltf_size j = 0; j < data->scenes[i].nodes_count; ++j)
                {
                        CGLTF_PTRFIXUP_REQ(data->scenes[i].nodes[j], data->nodes, data->nodes_count);

                        if (data->scenes[i].nodes[j]->parent)
                        {
                                return CGLTF_ERROR_JSON;
                        }
                }
        }

        CGLTF_PTRFIXUP(data->scene, data->scenes, data->scenes_count);

        for (cgltf_size i = 0; i < data->animations_count; ++i)
        {
                for (cgltf_size j = 0; j < data->animations[i].samplers_count; ++j)
                {
                        CGLTF_PTRFIXUP_REQ(data->animations[i].samplers[j].input, data->accessors, data->accessors_count);
                        CGLTF_PTRFIXUP_REQ(data->animations[i].samplers[j].output, data->accessors, data->accessors_count);
                }

                for (cgltf_size j = 0; j < data->animations[i].channels_count; ++j)
                {
                        CGLTF_PTRFIXUP_REQ(data->animations[i].channels[j].sampler, data->animations[i].samplers, data->animations[i].samplers_count);
                        CGLTF_PTRFIXUP(data->animations[i].channels[j].target_node, data->nodes, data->nodes_count);
                }
        }

        return 0;
}

/*
 * -- jsmn.c start --
 * Source: https://github.com/zserge/jsmn
 * License: MIT
 *
 * Copyright (c) 2010 Serge A. Zaitsev

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/**
 * Allocates a fresh unused token from the token pull.
 */
static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
                                   jsmntok_t *tokens, size_t num_tokens) {
        jsmntok_t *tok;
        if (parser->toknext >= num_tokens) {
                return NULL;
        }
        tok = &tokens[parser->toknext++];
        tok->start = tok->end = -1;
        tok->size = 0;
#ifdef JSMN_PARENT_LINKS
        tok->parent = -1;
#endif
        return tok;
}

/**
 * Fills token type and boundaries.
 */
static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
                                ptrdiff_t start, ptrdiff_t end) {
        token->type = type;
        token->start = start;
        token->end = end;
        token->size = 0;
}

/**
 * Fills next available token with JSON primitive.
 */
static int jsmn_parse_primitive(jsmn_parser *parser, const char *js,
                                size_t len, jsmntok_t *tokens, size_t num_tokens) {
        jsmntok_t *token;
        ptrdiff_t start;

        start = parser->pos;

        for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
                switch (js[parser->pos]) {
#ifndef JSMN_STRICT
                /* In strict mode primitive must be followed by "," or "}" or "]" */
                case ':':
#endif
                case '\t' : case '\r' : case '\n' : case ' ' :
                case ','  : case ']'  : case '}' :
                        goto found;
                }
                if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
                        parser->pos = start;
                        return JSMN_ERROR_INVAL;
                }
        }
#ifdef JSMN_STRICT
        /* In strict mode primitive must be followed by a comma/object/array */
        parser->pos = start;
        return JSMN_ERROR_PART;
#endif

found:
        if (tokens == NULL) {
                parser->pos--;
                return 0;
        }
        token = jsmn_alloc_token(parser, tokens, num_tokens);
        if (token == NULL) {
                parser->pos = start;
                return JSMN_ERROR_NOMEM;
        }
        jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
#ifdef JSMN_PARENT_LINKS
        token->parent = parser->toksuper;
#endif
        parser->pos--;
        return 0;
}

/**
 * Fills next token with JSON string.
 */
static int jsmn_parse_string(jsmn_parser *parser, const char *js,
                                 size_t len, jsmntok_t *tokens, size_t num_tokens) {
        jsmntok_t *token;

        ptrdiff_t start = parser->pos;

        parser->pos++;

        /* Skip starting quote */
        for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
                char c = js[parser->pos];

                /* Quote: end of string */
                if (c == '\"') {
                        if (tokens == NULL) {
                                return 0;
                        }
                        token = jsmn_alloc_token(parser, tokens, num_tokens);
                        if (token == NULL) {
                                parser->pos = start;
                                return JSMN_ERROR_NOMEM;
                        }
                        jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
#ifdef JSMN_PARENT_LINKS
                        token->parent = parser->toksuper;
#endif
                        return 0;
                }

                /* Backslash: Quoted symbol expected */
                if (c == '\\' && parser->pos + 1 < len) {
                        int i;
                        parser->pos++;
                        switch (js[parser->pos]) {
                        /* Allowed escaped symbols */
                        case '\"': case '/' : case '\\' : case 'b' :
                        case 'f' : case 'r' : case 'n'  : case 't' :
                                break;
                                /* Allows escaped symbol \uXXXX */
                        case 'u':
                                parser->pos++;
                                for(i = 0; i < 4 && parser->pos < len && js[parser->pos] != '\0'; i++) {
                                        /* If it isn't a hex character we have an error */
                                        if(!((js[parser->pos] >= 48 && js[parser->pos] <= 57) || /* 0-9 */
                                                 (js[parser->pos] >= 65 && js[parser->pos] <= 70) || /* A-F */
                                                 (js[parser->pos] >= 97 && js[parser->pos] <= 102))) { /* a-f */
                                                parser->pos = start;
                                                return JSMN_ERROR_INVAL;
                                        }
                                        parser->pos++;
                                }
                                parser->pos--;
                                break;
                                /* Unexpected symbol */
                        default:
                                parser->pos = start;
                                return JSMN_ERROR_INVAL;
                        }
                }
        }
        parser->pos = start;
        return JSMN_ERROR_PART;
}

/**
 * Parse JSON string and fill tokens.
 */
static int jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
                   jsmntok_t *tokens, size_t num_tokens) {
        int r;
        int i;
        jsmntok_t *token;
        int count = parser->toknext;

        for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
                char c;
                jsmntype_t type;

                c = js[parser->pos];
                switch (c) {
                case '{': case '[':
                        count++;
                        if (tokens == NULL) {
                                break;
                        }
                        token = jsmn_alloc_token(parser, tokens, num_tokens);
                        if (token == NULL)
                                return JSMN_ERROR_NOMEM;
                        if (parser->toksuper != -1) {
                                tokens[parser->toksuper].size++;
#ifdef JSMN_PARENT_LINKS
                                token->parent = parser->toksuper;
#endif
                        }
                        token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
                        token->start = parser->pos;
                        parser->toksuper = parser->toknext - 1;
                        break;
                case '}': case ']':
                        if (tokens == NULL)
                                break;
                        type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
#ifdef JSMN_PARENT_LINKS
                        if (parser->toknext < 1) {
                                return JSMN_ERROR_INVAL;
                        }
                        token = &tokens[parser->toknext - 1];
                        for (;;) {
                                if (token->start != -1 && token->end == -1) {
                                        if (token->type != type) {
                                                return JSMN_ERROR_INVAL;
                                        }
                                        token->end = parser->pos + 1;
                                        parser->toksuper = token->parent;
                                        break;
                                }
                                if (token->parent == -1) {
                                        if(token->type != type || parser->toksuper == -1) {
                                                return JSMN_ERROR_INVAL;
                                        }
                                        break;
                                }
                                token = &tokens[token->parent];
                        }
#else
                        for (i = parser->toknext - 1; i >= 0; i--) {
                                token = &tokens[i];
                                if (token->start != -1 && token->end == -1) {
                                        if (token->type != type) {
                                                return JSMN_ERROR_INVAL;
                                        }
                                        parser->toksuper = -1;
                                        token->end = parser->pos + 1;
                                        break;
                                }
                        }
                        /* Error if unmatched closing bracket */
                        if (i == -1) return JSMN_ERROR_INVAL;
                        for (; i >= 0; i--) {
                                token = &tokens[i];
                                if (token->start != -1 && token->end == -1) {
                                        parser->toksuper = i;
                                        break;
                                }
                        }
#endif
                        break;
                case '\"':
                        r = jsmn_parse_string(parser, js, len, tokens, num_tokens);
                        if (r < 0) return r;
                        count++;
                        if (parser->toksuper != -1 && tokens != NULL)
                                tokens[parser->toksuper].size++;
                        break;
                case '\t' : case '\r' : case '\n' : case ' ':
                        break;
                case ':':
                        parser->toksuper = parser->toknext - 1;
                        break;
                case ',':
                        if (tokens != NULL && parser->toksuper != -1 &&
                                        tokens[parser->toksuper].type != JSMN_ARRAY &&
                                        tokens[parser->toksuper].type != JSMN_OBJECT) {
#ifdef JSMN_PARENT_LINKS
                                parser->toksuper = tokens[parser->toksuper].parent;
#else
                                for (i = parser->toknext - 1; i >= 0; i--) {
                                        if (tokens[i].type == JSMN_ARRAY || tokens[i].type == JSMN_OBJECT) {
                                                if (tokens[i].start != -1 && tokens[i].end == -1) {
                                                        parser->toksuper = i;
                                                        break;
                                                }
                                        }
                                }
#endif
                        }
                        break;
#ifdef JSMN_STRICT
                        /* In strict mode primitives are: numbers and booleans */
                case '-': case '0': case '1' : case '2': case '3' : case '4':
                case '5': case '6': case '7' : case '8': case '9':
                case 't': case 'f': case 'n' :
                        /* And they must not be keys of the object */
                        if (tokens != NULL && parser->toksuper != -1) {
                                jsmntok_t *t = &tokens[parser->toksuper];
                                if (t->type == JSMN_OBJECT ||
                                                (t->type == JSMN_STRING && t->size != 0)) {
                                        return JSMN_ERROR_INVAL;
                                }
                        }
#else
                        /* In non-strict mode every unquoted value is a primitive */
                default:
#endif
                        r = jsmn_parse_primitive(parser, js, len, tokens, num_tokens);
                        if (r < 0) return r;
                        count++;
                        if (parser->toksuper != -1 && tokens != NULL)
                                tokens[parser->toksuper].size++;
                        break;

#ifdef JSMN_STRICT
                        /* Unexpected char in strict mode */
                default:
                        return JSMN_ERROR_INVAL;
#endif
                }
        }

        if (tokens != NULL) {
                for (i = parser->toknext - 1; i >= 0; i--) {
                        /* Unmatched opened object or array */
                        if (tokens[i].start != -1 && tokens[i].end == -1) {
                                return JSMN_ERROR_PART;
                        }
                }
        }

        return count;
}

/**
 * Creates a new parser based over a given  buffer with an array of tokens
 * available.
 */
static void jsmn_init(jsmn_parser *parser) {
        parser->pos = 0;
        parser->toknext = 0;
        parser->toksuper = -1;
}
/*
 * -- jsmn.c end --
 */

#endif /* #ifdef CGLTF_IMPLEMENTATION */

/* cgltf is distributed under MIT license:
 *
 * Copyright (c) 2018-2021 Johannes Kuhlmann

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */