RE_Material.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        Render Library (C++)
 *
 * COMMENTS:    Material definition for lit geometry
 *
 */

#ifndef __RE_Material_h__
#define __RE_Material_h__

#include "RE_API.h"
#include <DEP/DEP_MicroNode.h>
#include <SYS/SYS_AtomicInt.h>
#include <UT/UT_Color.h>
#include <UT/UT_IntArray.h>
#include <UT/UT_NonCopyable.h>
#include <UT/UT_Options.h>
#include <UT/UT_Rect.h>
#include <UT/UT_String.h>
#include <UT/UT_UniquePtr.h>
#include <UT/UT_Vector3.h>
#include <UT/UT_ValArray.h>
#include <UT/UT_XformOrder.h>
#include "RE_Types.h"
#include "RE_TextureTypes.h"
#include "RE_TextureMap.h"
#include "RE_UniformBlock.h"

class RE_OGLRender;
class RE_OGLTexture;
class RE_Render;
class RE_Shader;
class RE_Texture2DMap;
class RE_TextureMap;
class RE_TextureCubeMap;

class RE_API RE_Material : public UT_NonCopyable
{
public:
    explicit RE_Material(const char *materialName);

    const UT_StringHolder &
                getMaterialName() const { return myMaterialName; }
    int         getUniqueId() const     { return myUniqueId; }
    
    int64       getVersion() const      { return myVersion; }
    void        setVersion(int64 v)     { myVersion = v; }
    
    void        dirty(bool dirty = true) { myDirtyFlag = dirty; }
    bool        isDirty(fpreal time) const
                    {
                        if(myDirtyFlag || myDepNode.isDirty())
                            return true;
                        if(myTimeDep && !SYSisEqual(time, myTime))
                            return true;
                        return false;
                    }

    void        setTimeDependent(bool timedep, fpreal t = 0.0)
                    {
                        myTimeDep = timedep;
                        myTime = timedep ? t : 0.0;
                    }
    bool        isTimeDependent() const { return myTimeDep; }
    fpreal      getCurrentTime() const  { return myTime; }

    void        incref()        { myRefCount.add(1); }
    void        decref()
                {
                    if (!myRefCount.add(-1))
                        delete this;
                }

    void         setNodePath(UT_StringHolder path, int node_id);
    const UT_StringHolder &
                 getNodePath() const { return myNodePath; }
    int          getNodeId() const { return myNodeID; }

    // Name of the material network
    void         setMatNetName(const UT_StringRef &mat_path)
                    { myMatNetName = mat_path; }
    const UT_StringRef &getMatNetName() const
                    { return myMatNetName; }
    void         setMatXNodeVersion(int64 version) { myMatXVersion = version; }
    int64        getMatXNodeVersion() const { return myMatXVersion; }
    void         dirtyMatNet(bool dirty = true) { myMatNetDirty = dirty; }
    bool         isMatNetDirty() const { return myMatNetDirty; }
    

    // Parameter overrides
    void         setOverrides(const UT_Options *overrides);
    const UT_Options  &getOverrides() const { return myOverrides; }
    bool         hasOverrides() const { return myOverrides.getNumOptions()>0; }

    // Vertex array overrides
    void         setVertexOverrides(const UT_StringMap<UT_StringHolder> &ovr)
                                        { myVertexOverrides = ovr; }
    const UT_StringMap<UT_StringHolder> &vertexOverrides() const
                                        { return myVertexOverrides; }

    enum RE_MaterialType
    {
        FILM_SURFACE,
        GAMES_SURFACE,
        HAIR,
        TERRAIN_SURFACE,
        MATX_SURFACE
    };
    void         setMaterialType(RE_MaterialType type);
    RE_MaterialType getMaterialType() const { return myMaterialType; }

    void         markDefaultShader(bool def) { myDefaultShader = def; }
    bool         isDefaultShader() const  { return myDefaultShader; }

    // Assign a shader by its program ID from RE_Shader::getProgram()
    void         assignShaderRef(int shader_program_id,
                                 RE_ShaderTarget ptype=RE_SHADER_TARGET_TRIANGLE);
    void         assignShader(RE_Shader *sh,
                              RE_ShaderTarget ptype = RE_SHADER_TARGET_TRIANGLE,
                              bool owned = true);
    void         assignShader(UT_UniquePtr<RE_Shader> &&sh,
                              RE_ShaderTarget ptype=RE_SHADER_TARGET_TRIANGLE);

    int          getShaderRefID(RE_ShaderTarget ptype=RE_SHADER_TARGET_TRIANGLE) const;

    // methods to deal with textures
    void         clearTexture(RE_Render *r);
    void         clearDiffuseMap();

    void         reserveDiffuseLayers(int nlayers);
    
    enum RE_TexMapType
    {
        DIFFUSE,
        SPECULAR,
        BUMP,
        NORMAL,
        OPACITY,
        ENVIRONMENT,
        DISPLACEMENT,
        EMISSION,
        ROUGHNESS,
        OCCLUSION,
        METALLIC,
        COAT_INTENSITY,
        COAT_ROUGHNESS,
        REFLECTION_AMOUNT,

        HAIR_DIFFUSE,
        HAIR_DIFFUSE_BLEND,
        HAIR_SPECULAR,
        HAIR_SPECULAR_BLEND,
        HAIR_ALPHA,

        GAME_BLEND,

        NUM_TEXMAP_TYPES
    };
    
    // General diffuse texture, 1 allowed per layer.
    RE_TextureHolder getDiffuseMap(RE_Render *r,
                                   int layer,
                                   bool preload=false,
                                   bool mat_changed = true);

    // Extra textures, only 1 allowed for the first layer.
    RE_TextureHolder getSpecularMap(RE_Render *r, bool preload = false,
                                    bool mat_change = true);
    RE_TextureHolder getBumpMap(RE_Render *r, bool preload = false,
                                bool mat_change = true);
    RE_TextureHolder getNormalMap(RE_Render *r, bool preload = false,
                                  bool mat_change = true);
    RE_TextureHolder getOpacityMap(RE_Render *r, bool preload = false,
                                   bool mat_change = true);
    RE_TextureHolder getDisplaceMap(RE_Render *r, bool preload = false,
                                    bool mat_change = true);
    RE_TextureHolder getEmissionMap(RE_Render *r, bool preload = false,
                                    bool mat_change = true);
    RE_TextureHolder getRoughnessMap(RE_Render *r, bool preload = false,
                                     bool mat_change = true);
    RE_TextureHolder getOcclusionMap(RE_Render *r, bool preload = false,
                                     bool mat_change = true);
    RE_TextureHolder getMetallicMap(RE_Render *r, bool preload = false,
                                    bool mat_change = true);
    RE_TextureHolder getCoatIntensityMap(RE_Render *r, bool preload = false,
                                         bool mat_change = true);
    RE_TextureHolder getCoatRoughnessMap(RE_Render *r, bool preload = false,
                                         bool mat_change = true);
    RE_TextureHolder getReflectionAmountMap(RE_Render *r, bool preload = false,
                                            bool mat_change = true);

    RE_TextureHolder getHairDiffuseMap(RE_Render *r, bool preload = false);
    RE_TextureHolder getHairSpecularMap(RE_Render *r, bool preload = false);
    RE_TextureHolder getHairDiffuseRamp(RE_Render *r, bool preload = false);
    RE_TextureHolder getHairSpecularRamp(RE_Render *r, bool preload = false);
    RE_TextureHolder getHairAlphaRamp(RE_Render *r, bool preload = false);
   
    // Environment map to affect specular reflection. One allowed for layer 0.
    RE_TextureHolder getEnvMap(RE_Render *r, bool preload = false);

    // Returns the explicit texture unit binding for the given texture uniform
    // or RE_MATTEX_NONE if there is no explicit binding.
    static RE_MaterialTextureBinding
                   getMaterialTextureBinding(const UT_StringRef &texname);

    // Determine if the texture file is a regular texture (2D map) or a UDIM
    // (2D Array map)
    static bool fetchRegOrUDIM(const UT_StringRef &tex_name,
                               const UT_StringRef &node_path,
                               RE_TextureMap *&map,
                               bool allow_preload = false,
                               const char *uvtile_marker = nullptr);
    
    bool           areTexturesPending() { return myTextureLoadPending; }

    void           clearTextureLayer(int layer);

    // In order for these to return the correct value, the corresponding
    // get..() method must be called first.
    bool           hasSpecularMap() const { return mySpecMap.myTex.isValid(); }
    bool           hasBumpMap() const { return myBumpMap.myTex.isValid(); }
    bool           hasNormalMap() const { return myNormalMap.myTex.isValid(); }
    bool           hasOpacityMap() const{ return myOpacityMap.myTex.isValid(); }
    bool           hasDisplaceMap() const{return myDisplaceMap.myTex.isValid();}
    bool           hasEnvMap() const { return myEnvMap.myTex.isValid(); }
    bool           hasEmissionMap() const
                        { return myEmissionMap.myTex.isValid(); }
    bool           hasRoughnessMap() const
                        { return myRoughMap.myTex.isValid(); }
    bool           hasOcclusionMap() const
                        { return myOcclusionMap.myTex.isValid(); }
    bool           hasMetallicMap() const
                        { return myMetallicMap.myTex.isValid(); }
    bool           hasCoatRoughnessMap() const
                        { return myCoatRoughMap.myTex.isValid(); }
    bool           hasCoatIntensityMap() const
                        { return myCoatIntMap.myTex.isValid(); }
    bool           hasReflectionAmountMap() const
                        { return myReflectAmountMap.myTex.isValid(); }

    bool           hasHairDiffuseMap() const
                        { return myHairDiffMap.myTex.isValid(); }
    bool           hasHairSpecularMap() const
                        { return myHairSpecMap.myTex.isValid(); }
    bool           hasHairDiffuseRamp() const
                        { return myHairDiffRamp.myTex.isValid(); }
    bool           hasHairSpecularRamp() const
                        { return myHairSpecRamp.myTex.isValid(); }
    bool           hasHairAlphaRamp() const
                        { return myHairAlphaRamp.myTex.isValid(); }

    // Query the material if it is opaque or transparent. 'check_diffuse_alpha'
    // will check the diffuse texture's alpha channel.
    bool           isTransparent(bool check_diffuse_alpha) const;

    void           setTransparent(bool alpha) { myIsTransparent = alpha; }

    // Returns true if this material has a texture map (diffuse, bump, etc).
    bool           isTextured() const    { return myTexturedFlag; }
    void           setTextured(bool has_tex) { myTexturedFlag = has_tex; }

    // Requires UVs outside of texturing
    bool           needsUVs() const { return myNeedsUVs; }
    void           setNeedsUVs(bool uvs) { myNeedsUVs = uvs; }
    // 
    void           needTextureUpdate()    { myNeedsTexUpdate = true; }
    bool           needsTextureUpdate() const { return myNeedsTexUpdate; }

    void           setNumMatXTextures(int num);
    void           setMatXTexture(RE_TextureMap *map, int index);
    RE_TextureMap *getMatXTexture(int index) const;

    // Call after all texure parms and textures are set up.
    void           finishTextureSetup(RE_Render *r, bool preload);
    bool           checkForCacheUpdate(int cache_serial,fpreal t); //inline below

    bool           isMatCapTextured() const { return myEmissionMatCap; }

    // Returns true if textures are used, and the uvsets used by all layers of
    // the material.
    const UT_Map<UT_StringHolder, int> &getUVSets();

    void           clearUVSets();
    void           addUVSet(const UT_StringRef &uv);

    // Return the texture coord set used by 'layer'
    const UT_StringHolder &getLayerUVSet(int layer) const;

    void         setTextureFormat(RE_TextureCompress format);
    RE_TextureCompress getTextureFormat() const { return myTexFormat; }
    
    void         limitTextureSize(bool limit, int w, int h);
    bool         limitTextureSize() const       { return myLimitTextureSize; }
    void         getMaxTextureSize(int &w,int &h)
                                                { myMaxTextureW = w;
                                                  myMaxTextureH = h; }
    
    void         setTextureScale(float sc);
    float        getTextureScale() const        { return myTextureScale; }

    void         setTextureMemLimitMB(int mem);
    int          getTextureMemLimitMB() const   { return myTextureMemLimitMB; }
    
    void         mipMapTextures(bool yes);
    bool         mipMapTextures() const         { return myMipMapTextures; }

    void         setAnisotropySamples(int samp);
    int          getAnisotropySamples() const   { return myTextureAnisotropy; }

    void         allowShaders(bool yes)         { myAllowShaders = yes; }
    bool         allowShaders() const           { return myAllowShaders; }

    // methods to deal with lighting
    void         doLighting(bool yes );
    bool         isLit() const                  { return myDoLighting; }

    RE_Shader   *createShader(RE_Render *r,
                              const char *name = nullptr,
                              RE_ShaderTarget ptype= RE_SHADER_TARGET_TRIANGLE);
    RE_Shader   *getShader(RE_ShaderTarget sht=RE_SHADER_TARGET_TRIANGLE) const;
    bool         isShaderOwned(RE_ShaderTarget sht
                                = RE_SHADER_TARGET_TRIANGLE) const
                    { return myOwnShader[sht]; }

    /// caches the source for the shader in the material.
    void         setShaderSource(const char *vert_src,
                                 const char *geom_src,
                                 const char *frag_src,
                                 RE_ShaderTarget ptype
                                                 = RE_SHADER_TARGET_TRIANGLE);
    
    /// checks this materials' shader against the source, and returns true if
    /// it matches.
    bool         hasShaderSource(const char *vert_src,
                                 const char *geom_src,
                                 const char *frag_src,
                                 RE_ShaderTarget ptype
                                                 = RE_SHADER_TARGET_TRIANGLE);

    void         setShaderProgram(const char *program_file);
    bool         hasShaderProgram(const char *program_file) const;
    bool         hasCustomShader(RE_ShaderTarget ptype
                                 = RE_SHADER_TARGET_TRIANGLE) const
                                { return myShaderProgramFile.isstring() ||
                                        myVertexSource[ptype].isstring() ||
                                        myGeometrySource[ptype].isstring() ||
                                        myFragmentSource[ptype].isstring(); }
    bool         customShaderDirty() const { return myCustomShaderDirty; }
    
    void         removeShader();

    // methods to access and change the material information
    float        amb( unsigned idx ) const      { return myAmb[idx]; }
    UT_Vector3F  amb() const                    { return myAmb; }
    float        diff( unsigned idx ) const     { return myDiff[idx]; }
    UT_Vector3F  diff() const                   { return myDiff; }
    float        spec( unsigned idx ) const     { return mySpec[idx]; }
    UT_Vector3F  spec() const                   { return mySpec; }
    float        emit( unsigned idx ) const     { return myEmit[idx]; }
    UT_Vector3F  emit() const                   { return myEmit; }
    UT_Vector3F  metallicEdgeTint() const       { return myMetallicEdge; }
    float        metallic() const               { return myMetallic; }
    float        alpha() const                  { return myAlpha; }
    float        roughness() const              { return myRoughness; }
    float        reflection() const             { return myReflection; }
    float        coatRoughness() const          { return myCoatRough; }
    float        coatIntensity() const          { return myCoatIntensity; }
    float        diffuseRoughness() const       { return myDiffRoughness; }

    /// Sets the perpendicular and parallel alpha factors. If the parallel
    /// alpha is less than zero, they are assumed to be the same.
    void         setAlpha( float alpha_perp, float alpha_para = -1.0 );

    // Alpha blend/cutout modes.
    enum AlphaMode
    {
        ALPHA_BLEND = 0, // normal alpha blending C*A + Cbg*(1-A)
        CUTOUT_ALPHA,    // (A >= cutoff) ? C : 0
        IGNORE_ALPHA,    // C
    };
    void         setAlphaMode(AlphaMode mode);
    AlphaMode    getAlphaMode() const
                     { return myAlphaMode; }

    void         setAlphaCutoff(fpreal alpha_val);
    fpreal       getAlphaCutoff() const
                 {
                     return (myAlphaMode != IGNORE_ALPHA) ? myAlphaCutoff : 0.0;
                 }


    /// If true, the shader generates its own alpha independent of the material
    /// parameters. This indicates that the material requires a transparency
    /// pass, since the renderer can otherwise not determine this from the
    /// shader code.
    void         setShaderAlpha(bool enabled)
                                        { myShaderAlphaFlag = enabled; }
    bool         hasShaderAlpha() const { return myShaderAlphaFlag; }
   
    // give roughness: this method will calculate shininess needed by OGL
    void         setRoughness( float r );

    // give shininess: this method will enforce sh within [0.001, 1e10]
    void         setShininess( float sh );

    void         setDiffuseRoughness(fpreal r);

    void         setAmb( float r, float g, float b );
    void         setDiff( float r, float g, float b );
    void         setSpec( float r, float g, float b );
    void         setEmit( float r, float g, float b );
    void         setMetallic(float metal); 
    void         setMetallicEdge(const UT_Vector3F &metal);

    void         setAmbient( UT_Color col );
    void         setDiffuse( UT_Color col );
    void         setSpecular( UT_Color col );
    void         setEmission( UT_Color col );
    
    void         setAmbient( const UT_Vector3F &col );
    void         setDiffuse( const UT_Vector3F &col );
    void         setSpecular( const UT_Vector3F &col );
    void         setEmission( const UT_Vector3F &col );

    void         setSpecularTint(fpreal t);
    fpreal       getSpecularTint() const { return mySpecTint; }

    enum { PHONG=0, BLINN=1, GGX=2, SPEC_ANGLE=3 };
    void         setSpecularModel(int spec_model);
    int          getSpecularModel() const { return mySpecModel; }
    void         setCoatSpecularModel(int spec_model);
    int          getCoatSpecuarModel() const { return myCoatModel; }
    void         setCoatIntensity(fpreal i);
    fpreal       getCoatIntensity() const { return myCoatIntensity; }
    void         setCoatRoughness(fpreal r);
    fpreal       getCoatRoughness() const { return myCoatRough; }
    
    void         setIOR(float ior);
    fpreal       getIOR() const { return myIOR; }

    void         setReflection(float r, bool explicit_r);
    fpreal       getReflection() const;

    void         usePackedColor(bool enable);
    void         useGeometryColor(bool enable);
    bool         usePackedColor() const { return myUsePackedColor; }
    bool         useGeometryColor() const { return myUseGeoColor; }

    // returns true if reflection was explicity set, not derived from IoR.
    bool         hasExplicitReflection() const { return myExplicitReflection; }

    void         setNeedsTangentSpace(bool b) { myNeedsTangentSpace = b; }
    bool         needsTangentSpace() const
                 {
                     return myNeedsTangentSpace ||
                            (myNormalMap.myMap &&
                             myNormalMapType == NMLMAP_TANGENT);
                 }
    
    // Parameters for the bump, spec, opac, env, disp and normal maps.
    enum re_NormalMapType { NMLMAP_TANGENT=0, NMLMAP_WORLD=1, NMLMAP_OBJECT=2 };

    void         setOpacityMapParms(bool invert, int component);
    void         setNormalParms(re_NormalMapType type, bool bias,
                                UT_Vector2F scale,
                                bool flip_x, bool flip_y, bool flip_z);
    void         setEnvParms(float scale, const UT_Vector3 &rot,
                            const UT_XformOrder &rord);

    enum re_Displace {
        DISPLACE_NORMAL,
        DISPLACE_VECTOR_TANGENT,
        DISPLACE_VECTOR_WORLD,
        DISPLACE_VECTOR_OBJECT };
    void         setDisplaceParms(float scale, float offset, float quality,
                                  re_Displace vector_space, bool y_up);
    void         setDisplaceLOD(float lod) { myDisplaceLOD = lod; }
    float        getDisplaceLOD() const { return myDisplaceLOD; }
    void         setRoughParms(bool invert_map, int component);
    void         setOcclusionParms(int component);
    void         setMetallicParms(int component);
    void         setCoatRoughnessParms(int component);
    void         setCoatIntensityParms(int component);
    void         setReflectionAmountParms(int component, bool affect_ior);
    void         setEmissionParms(bool use_matcap);

    bool         hasDisplacement() const;

    void         setUVTransform(RE_TexMapType maptype,
                                const UT_Matrix3F &xform,
                                int layer = 0);
    void         clearUVTransform(RE_TexMapType maptype,
                                  int layer = 0);

    // Hair parameters
    void         enableHairParameters(bool e) { myHairMaterialEnabled = e; }
    
    void         setHairDiffuse(float intensity,
                                UT_Vector3F root_col,
                                UT_Vector3F tip_col,
                                bool use_map,
                                bool use_ramp);
    
    void         setHairSpecular(float intensity,
                                 float angle,
                                 float shift,
                                 UT_Vector3F root_col,
                                 UT_Vector3F tip_col,
                                 bool use_map,
                                 bool use_ramp);
    void        setHairAlpha(float alpha,
                             bool use_alpha_ramp);

    // randomize hue, sat, and intensity of diffuse (and specular intensity)
    void        setHairRandomize(bool random_hue, UT_Vector2F hue_range,
                                 bool random_sat, UT_Vector2F sat_range,
                                 bool random_int, UT_Vector2F int_range,
                                 bool random_spec_int,
                                 UT_Vector2F spec_int_range);

    // Game shader

    // Use a transformed UV set.
    void        clearGameLayers(); 
    void        setUVTransform(int layer,
                               UT_Vector2F t,
                               fpreal      r,
                               UT_Vector2F s);
    void        getUVTransform(int layer,
                               UT_Vector2F &t,
                               fpreal      &r,
                               UT_Vector2F &s ) const;
    void        setUVLayerTint(int layer, bool use_tint, UT_Vector4F tint,
                               fpreal rough);

    // Use triplanar projection.
    void        setUVTriplanar(int layer,
                               fpreal scale = 1.0,
                               fpreal sharp = 1.0,
                               UT_Vector3F blend =UT_Vector3F(1.0f),
                               UT_Vector3F offset = UT_Vector3F(0.0f));
    bool        isUVTriplanar(int layer) const;
    fpreal      getUVTriplanarSharp(int layer) const;
    fpreal      getUVTriplanarScale(int layer) const;
    UT_Vector3F getUVTriplanarBlend(int layer) const;
    UT_Vector3F getUVTriplanarOffset(int layer) const;
    bool        getUVLayerUseTint(int layer) const;
    UT_Vector4F getUVLayerTint(int layer) const;
    fpreal      getUVLayerRough(int layer) const;


    // For environment lights, which temporarily apply their map to any
    // materials that don't already have an env map.
    static void                 setEnvMapOverride(RE_TextureHolder env_map,
                                                  const UT_Matrix3F &rot,
                                                  const UT_Vector3F &col);
    static void                 clearEnvMapOverride();
    static RE_TextureHolder     getEnvMapOverride();

    void        setReflectionMap(RE_Texture *map) { myReflectMap = map; }
    void        clearReflectionMap()              { myReflectMap = nullptr; }
    
#ifdef UT_DEBUG
    // debug output
    void         output();
#endif

    RE_MaterialPtr      cloneWithoutTexture() const;

    bool         loadTextureMaps(RE_Render *r, bool preload_only = false);

    // Maps can only be preloaded with loadTextureMaps(), not on the fly during
    // the render.
    void         preloadMapsOnly(bool preload) { myPreloadMaps = preload; }

    // Adds an explicit map to 'maptype'. Will be overriden by setTextureMap()
    // if that has/is called on the material.
    // nullptr is acceptable (blocks the RE_TextureCB map).
    void         assignTextureMap(RE_Texture *tex,
                                  RE_TexMapType maptype,
                                  int index = 0);
    // Remove the explicit map from 'maptype'.
    void         removeTextureMap(RE_TexMapType maptype,
                                  int index = 0);

    void         setTextureMap(RE_TextureMap *map,
                               bool give_ownership,
                               RE_TexMapType maptype,
                               const UT_StringRef &uv_set,
                               int index = 0);
    void         clearTextureMap(RE_TexMapType maptype,
                                 int index = 0);
    RE_TextureMap *getTextureMap(RE_TexMapType maptype,
                                 int index = 0);


    int          getNumDiffuseLayers() const
                 { return myMaterialType==FILM_SURFACE ?myNumDiffuseLayers :1; }

    bool         updateShaderForMaterial(
                               RE_Render *r,
                               int layer,
                               bool textured,
                               RE_ShaderTarget sht=RE_SHADER_TARGET_TRIANGLE,
                               RE_Shader *shader = nullptr,
                               bool allow_partial = false);
    void         restoreShader(RE_Render *r,
                               RE_ShaderTarget sht=RE_SHADER_TARGET_TRIANGLE);

    /// Returns the amount of main memory (NOT graphics memory!)
    /// owned by this RE_Material.
    int64        getMemoryUsage(bool inclusive) const;


    void         writeMaterialParmsToBlockGL4(RE_Render *r,
                                              RE_UniformBlock *block,
                                              int material_idx,
                                              int layer,
                                              bool lit,
                                              bool textured);
    // For bindless texturing.
    void         makeTexturesResident(RE_Render *r);
    void         removeTexturesFromResident(RE_Render *r);

    DEP_MicroNode &dependencies() { return myDepNode; }

    void         updateMaterialBlock(int layer);
    
    const RE_UniformBlockHandle &materialBlock() const
                                { return myMaterialBlock; }
    const RE_UniformBlockHandle &hairBlock() const
                                { return myHairMaterialBlock; }
    const RE_UniformBlockHandle &gameMatBlock() const
                                { return myGameMaterialBlock; }
private:

    void         loadShaderAttribNames();

    class re_MaterialTextureMap
    {
    public:
        re_MaterialTextureMap()
            : myMap(nullptr), myMapIndex(-1),
              myArrayMapIndex(-1), myTexCoords(0), myComponent(0),
              myExplicitMap(false), myOwnMap(false) {}
        ~re_MaterialTextureMap()
            {
                if(myOwnMap)
                    delete myMap;
            }
        RE_TextureMap   *myMap;
        RE_TextureHolder myTex;
        RE_CacheVersion  myTexVersion;
        UT_StringHolder  myUVSet;
        UT_DimRect       myUDIMArea;
        int              myMapIndex;
        int              myArrayMapIndex;
        int              myTexCoords;
        int              myComponent;
        bool             myExplicitMap;
        bool             myOwnMap;
    };
    re_MaterialTextureMap *fetchMapInfo(RE_TexMapType t,
                                        int index);

    RE_TextureHolder fetchTexture(RE_Render *r, RE_TextureMap *map,
                                  bool preload_only = false,
                                  bool mipmap = true);
    RE_TextureHolder fetchMap(RE_Render *r,
                              RE_TexMapType map_target,
                              re_MaterialTextureMap &map,
                              bool preload,
                              bool promote_1chan_to_rgb = false);

    bool         bindTextureMap(RE_Render *r, re_MaterialTextureMap &map,
                                const char *udim_stride_name,
                                RE_TexMapType type,
                                const char *component_name = nullptr);
    void         bindUVTransform(RE_TexMapType type,
                                 int layer = 0);
    void         bindComponentAndUDIM(re_MaterialTextureMap &map,
                                      const char *udim_area_name,
                                      const char *component_name = nullptr);
    void         bindTextureMaps(RE_Render *r, int layer);
private:
    ~RE_Material();     // No subclassing

    void         updateHairMaterialForShader(RE_Render  *r,
                                             bool        textured,
                                             RE_ShaderTarget sht,
                                             RE_Shader  *sh);
    void         updateGameMaterialForShader(RE_Render *r,
                                             bool textured,
                                             RE_ShaderTarget sht,
                                             RE_Shader  *sh);

    // -- Bindless texturing support
    void         makeResident(RE_Render *r, RE_TextureHolder texmap);
    void         removeResident(RE_Render *r, RE_TextureHolder texmap);
    bool         bindTextureHandle(RE_Render *r,
                                   re_MaterialTextureMap &map,
                                   RE_UniformBlock *material_block,
                                   int material_index,
                                   const char *texture_name);
    // --
    
    UT_Vector4F  getComponentVector(int comp,
                                    const re_MaterialTextureMap &map) const;
    
    DEP_MicroNode                myDepNode;
    UT_Vector3F                  myAmb;
    UT_Vector3F                  myDiff;
    UT_Vector3F                  mySpec;
    UT_Vector3F                  myEmit;
    UT_Vector3F                  myMetallicEdge;
    float                        myMetallic;
    float                        myAlpha;
    float                        myRoughness;
    float                        myDiffRoughness;
    float                        mySpecTint;
    RE_MaterialType              myMaterialType;
    AlphaMode                    myAlphaMode;
    float                        myAlphaCutoff;

    // I own map if if I created my RE_OGLTex
    UT_ValArray<re_MaterialTextureMap> myTextureMap;

    RE_Texture          *myReflectMap; // always temporary during a render

    re_MaterialTextureMap mySpecMap;
    re_MaterialTextureMap myOpacityMap;
    re_MaterialTextureMap myBumpMap;
    re_MaterialTextureMap myRoughMap;
    re_MaterialTextureMap myEmissionMap;
    re_MaterialTextureMap myNormalMap;
    re_MaterialTextureMap myDisplaceMap;
    re_MaterialTextureMap myOcclusionMap;
    re_MaterialTextureMap myMetallicMap;
    re_MaterialTextureMap myCoatRoughMap;
    re_MaterialTextureMap myCoatIntMap;
    re_MaterialTextureMap myReflectAmountMap;
    re_MaterialTextureMap myGameBlendMap;
    re_MaterialTextureMap myEnvMap;
    re_MaterialTextureMap myHairDiffMap;
    re_MaterialTextureMap myHairSpecMap;
    re_MaterialTextureMap myHairDiffRamp;
    re_MaterialTextureMap myHairSpecRamp;
    re_MaterialTextureMap myHairAlphaRamp;

    UT_Array<RE_TextureMap *> myMatXTextures;

    UT_IntArray           mySamplerBindings;
    
    // The above maps are only valid pointers if myRenderCount is equal to
    // RE_OGLRender::getRenderCount.
    int64                myRenderCount;
    

    UT_StringHolder      myMaterialName;
    UT_StringHolder      myNodePath;
    UT_StringHolder      myMatNetName;
    int                  myNodeID;
    UT_Options           myOverrides;
    UT_StringMap<UT_StringHolder> myVertexOverrides;
    unsigned             myDoLighting:1,
                         myMipMapTextures:1,
                         myLimitTextureSize:1,
                         myDefaultShader:1,
                         myAllowShaders:1,
                         myTrivialTextureAlpha:1,
                         myInvertRoughMap:1,
                         myPreloadMaps:1,
                         myTextureLoadPending:1,
                         myCustomShaderDirty:1,
                         myNeedsTexUpdate:1,
                         myNeedsTexCheck:1,
                         myTextureSetup:1,
                         myMatNetDirty:1,
                         myIsTransparent:1,
                         myNeedsTangentSpace:1;
    int                  myTextureAnisotropy;
    int                  myNumDiffuseLayers;

    RE_TextureCompress   myTexFormat;
    int                  myMaxTextureW, myMaxTextureH;
    float                myTextureScale;
    int                  myTextureMemLimitMB;
    float                myAlphaPara;
    bool                 myShaderAlphaFlag;
    bool                 myUseGeoColor;
    bool                 myUsePackedColor;
    bool                 myDirtyFlag;

    // Specular parms
    fpreal               myIOR;
    fpreal32             myReflection;
    int                  mySpecModel;
    bool                 myReflectAsIOR;
    bool                 myExplicitReflection;

    // Coat parms
    fpreal               myCoatRough;
    fpreal               myCoatIntensity;
    int                  myCoatModel;

    // normal map parms
    bool                 myNormalBias;
    bool                 myNormalFlipX;
    bool                 myNormalFlipY;
    bool                 myNormalFlipZ;
    UT_Vector2F          myNormalScale;
    re_NormalMapType     myNormalMapType;

    // environment map parms
    UT_Vector3           myEnvRotation;
    float                myEnvScale;
    UT_XformOrder        myEnvRotOrder;

    // displacement map parms
    float                myDisplaceScale;
    float                myDisplaceOffset;
    float                myDisplaceQuality;
    re_Displace          myDisplaceSpace;
    bool                 myDisplaceYUp;
    float                myDisplaceLOD;

    bool                 myOpacityMapInvert;
    int                  myRoughComp;
    int                  myOcclusionComp;
    int                  myMetallicComp;
    bool                 myEmissionMatCap;

    RE_Shader           *myShader[RE_SHADER_NUM_TARGETS];
    bool                 myOwnShader[RE_SHADER_NUM_TARGETS];
    UT_String            myVertexSource[RE_SHADER_NUM_TARGETS];
    UT_String            myGeometrySource[RE_SHADER_NUM_TARGETS];
    UT_String            myFragmentSource[RE_SHADER_NUM_TARGETS];
    UT_String            myShaderProgramFile;
    int                  myShaderRef[RE_SHADER_NUM_TARGETS];

    RE_UniformBlockHandle myMaterialBlock;
    int                  myMaterialOverride;
    bool                 myMatBlockDirty;
    bool                 myMatBlockHasEnvMapTexture;
    bool                 myMatBlockHasReflectMapTexture;
    bool                 myMatBlockHasDiffuseTexture;
    bool                 myTexturedFlag;
    bool                 myNeedsUVs;
    int                  myTextureCacheSerial;

    // Hair parameters
    class re_HairCompParms
    {
    public:
        re_HairCompParms() : intensity(0.5), shift(0.0), angle(1.0),
                             root_col(1,1,1), tip_col(1,1,1),
                             use_ramp(false), use_map(false) {}
        float intensity;
        float angle;
        float shift;
        UT_Vector3F root_col;
        UT_Vector3F tip_col;
        bool use_ramp;
        bool use_map;
    };
    struct re_HairRandomParms
    {
        re_HairRandomParms() : randomize(false) {}
        bool randomize;
        UT_Vector2F range;
    };

    bool                 myHairMaterialEnabled;
    re_HairCompParms     myHairDiffuse;
    re_HairCompParms     myHairSpecular;
    float                myHairAlpha;
    bool                 myHairUseAlphaRamp;
    re_HairRandomParms   myHairRandomDiffHue;
    re_HairRandomParms   myHairRandomDiffSat;
    re_HairRandomParms   myHairRandomDiffInt;
    re_HairRandomParms   myHairRandomSpecInt;
    RE_UniformBlockHandle myHairMaterialBlock;
    int                  myHairMatBlockIndex;
    int                  myHairRandomTextureIndex;
    int                  myHairDiffBaseMapIndex;
    UT_DimRect           myHairDiffBaseMapUDIMArea;
    UT_DimRect           myHairSpecBaseMapUDIMArea;

    RE_TextureHolder     myRandomTexture;

    // cached texture units for 'myLastMatShader'.
   
    int                  myMatBlockDiffuseIndex;
    int                  myMatBlockDiffuseArrayIndex;
    
    int                  myMatBlockEnvMapIndex;
    int                  myMatBlockReflectMapIndex;
    int                  myMatBlockIndex;
    int                  myHairMaterialOverride;

    // hair material block.
    void                *myLastHairShader;
    int                  myLastHairShaderSerial;
    int                  myHairDiffIndex;
    int                  myHairDiffArrayIndex;
    int                  myHairSpecIndex;
    int                  myHairSpecArrayIndex;
    int                  myHairDiffRampIndex;
    int                  myHairSpecRampIndex;
    int                  myHairAlphaRampIndex;
    int                  myMatBlockHairIndex;

    // game shader material block
    RE_UniformBlockHandle myGameMaterialBlock;
    int                   myGameMaterialOverride;
    
    struct re_GameLayer
    {
        re_GameLayer() : triplanar(false), scale(1,1), trans(0,0), rot(0),
                         sharp(1), tpscale(1), transform(1.0),
                         tpblend(1,1,1), tpoff(0,0,0), use_tint(false),
                         tint(1.0, 1.0, 1.0, 1.0), rough(1.0) {}
        bool        triplanar;
        UT_Vector2F scale;
        UT_Vector2F trans;
        float       rot;
        float       sharp;
        float       tpscale;
        UT_Vector3F tpblend;
        UT_Vector3F tpoff;
        UT_Matrix3F transform;
        bool        use_tint;
        UT_Vector4F tint;
        float       rough;
    };
    UT_Array<re_GameLayer> myGameLayers;
    const RE_Shader     *myLastGameShader;
    int                  myLastGameShaderSerial;
    int                  myGameBlendIndex;
    int                  myGameMatBlockIndex;

    int                  myPrevSeamlessCubeMap;
    
    bool                 myTimeDep;
    fpreal               myTime;

    SYS_AtomicInt32      myRefCount;
    int64                myUniqueId;
    int64                myVersion;
    int64                myTexVersion;
    int64                myMatXVersion;
    UT_StringMap<int>    myUVSets; 
    
    class re_UVTransform
    {
    public:
        re_UVTransform() : transform(1.0), identity(true) {}
        re_UVTransform(const UT_Matrix3F &t, bool i)
            : transform(t), identity(i) {}
        UT_Matrix3F transform;
        bool        identity;
    };
    UT_Array<re_UVTransform> myTexUVTransform;
    UT_Array<re_UVTransform> myDiffuseUVTransform;
};

static inline void intrusive_ptr_add_ref(RE_Material *m) { m->incref(); }
static inline void intrusive_ptr_release(RE_Material *m) { m->decref(); }

inline void
RE_Material::setAmbient( const UT_Vector3F &col )
{
    setAmb(col.x(), col.y(), col.z());
}
inline void
RE_Material::setDiffuse( const UT_Vector3F &col )
{
    setDiff(col.x(), col.y(), col.z());
}
inline void
RE_Material::setSpecular( const UT_Vector3F &col )
{
    setSpec(col.x(), col.y(), col.z());
}
inline void
RE_Material::setEmission( const UT_Vector3F &col )
{
    setEmit(col.x(), col.y(), col.z());
}

inline bool
RE_Material::checkForCacheUpdate(int cache_serial, fpreal t)
{
    if(cache_serial != myTextureCacheSerial)
    {
        myTextureCacheSerial = cache_serial;
        myNeedsTexUpdate = true;
        return true;
    }
    if(myTimeDep && !SYSisEqual(t, myTime))
    {
        myNeedsTexUpdate = true;
        return true;
    }
    return false;
}

inline bool
RE_Material::hasDisplacement() const
{
    RE_Shader *sh = getShader(RE_SHADER_TARGET_TRIANGLE);
    if(sh)
        return sh->hasTessellation();

    return false;
}

inline RE_Shader*
RE_Material::getShader(RE_ShaderTarget sht) const
{
    if(myShader[sht])
        return myShader[sht];
    if(myShaderRef[sht] != 0)
        return RE_Shader::lookupProgram(myShaderRef[sht]);
    return nullptr;
}


inline int
RE_Material::getShaderRefID(RE_ShaderTarget sht) const
{
    return myShaderRef[sht];
}

// This contains a list of materials for drawing a given geometry, and is
// normally used as a transient list of materials during a redraw.
// This class does not own the materials as they are also held in
// a higher-level cache as well.
class RE_API RE_MaterialAtlas : public UT_Map<int,RE_MaterialPtr>
{
public:
    // Default material for unassigned prims.
    const RE_MaterialPtr &getDefaultMaterial() const
                { return myDefault; }

    // Factory default material if materials are disabled.
    const RE_MaterialPtr &getFactoryMaterial() const
                { return myFactory; }
    
    bool        isDirty(fpreal time) const;

    RE_MaterialPtr get(int material_id) const
                {
                    if(material_id == -1)
                        return myDefault ? myDefault : myFactory;
                    const_iterator entry =  find(material_id);
                    if(entry != end())
                        return entry->second;

                    return nullptr;
                }


    // Add a new material to the atlas
    void   add(const RE_MaterialPtr &material)
                { (*this)[ material->getUniqueId() ] = material; }

    // Set the default material, which will be used if no other material
    // assignments are present.
    void   setDefaultMaterial(const RE_MaterialPtr &material,bool add_list=true)
            { myDefault = material; if(add_list && material) add(material); }

    // Sets the factory default material, which is used when all materials
    // are turned off (as the default material may be the object material).
    void   setFactoryMaterial(const RE_MaterialPtr &material,bool add_list=true)
            { myFactory = material; if(add_list && material) add(material); }

private:
    RE_MaterialPtr             myDefault;
    RE_MaterialPtr             myFactory;
};

#endif