types.h

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//
// Copyright 2020 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HIO_TYPES_H
#define PXR_IMAGING_HIO_TYPES_H

#include "pxr/pxr.h"
#include "pxr/imaging/hio/api.h"
#include <stdlib.h>
#include <cinttypes>

PXR_NAMESPACE_OPEN_SCOPE

class GfVec3i;

/// \enum HioFormat
///
/// HioFormat describes the memory format of image buffers used in Hio.
///
/// For reference, see:
///  https://www.khronos.org/registry/vulkan/specs/1.1/html/vkspec.html#VkFormat
enum HioFormat
{
    HioFormatInvalid=-1,

    // UNorm8 - a 1-byte value representing a float between 0 and 1.
    // float value = (unorm / 255.0f);
    HioFormatUNorm8=0,
    HioFormatUNorm8Vec2,
    HioFormatUNorm8Vec3,
    HioFormatUNorm8Vec4,

    // SNorm8 - a 1-byte value representing a float between -1 and 1.
    // float value = max(snorm / 127.0f, -1.0f);
    HioFormatSNorm8,
    HioFormatSNorm8Vec2,
    HioFormatSNorm8Vec3,
    HioFormatSNorm8Vec4,

    // Float16 - a 2-byte IEEE half-precision float.
    HioFormatFloat16,
    HioFormatFloat16Vec2,
    HioFormatFloat16Vec3,
    HioFormatFloat16Vec4,

    // Float32 - a 4-byte IEEE float.
    HioFormatFloat32,
    HioFormatFloat32Vec2,
    HioFormatFloat32Vec3,
    HioFormatFloat32Vec4,

    // Double64 - a 8-byte IEEE double.
    HioFormatDouble64,
    HioFormatDouble64Vec2,
    HioFormatDouble64Vec3,
    HioFormatDouble64Vec4,

    // UInt16 - a 2-byte unsigned short integer. 
    HioFormatUInt16,
    HioFormatUInt16Vec2,
    HioFormatUInt16Vec3,
    HioFormatUInt16Vec4,

    // Int16 - a 2-byte signed short integer. 
    HioFormatInt16,
    HioFormatInt16Vec2,
    HioFormatInt16Vec3,
    HioFormatInt16Vec4,

    // UInt32 - a 4-byte unsigned integer. 
    HioFormatUInt32,
    HioFormatUInt32Vec2,
    HioFormatUInt32Vec3,
    HioFormatUInt32Vec4,

    // Int32 - a 4-byte signed integer.
    HioFormatInt32,
    HioFormatInt32Vec2,
    HioFormatInt32Vec3,
    HioFormatInt32Vec4,

    // UNorm8 SRGB - a 1-byte value representing a float between 0 and 1.
    HioFormatUNorm8srgb,
    HioFormatUNorm8Vec2srgb,
    HioFormatUNorm8Vec3srgb,
    HioFormatUNorm8Vec4srgb,

    // BPTC compressed. 3-component, 4x4 blocks, signed floating-point
    HioFormatBC6FloatVec3,

    // BPTC compressed. 3-component, 4x4 blocks, unsigned floating-point
    HioFormatBC6UFloatVec3,

    // BPTC compressed. 4-component, 4x4 blocks, unsigned byte.
    // Representing a float between 0 and 1.
    HioFormatBC7UNorm8Vec4,

    // BPTC compressed. 4-component, 4x4 blocks, unsigned byte, sRGB.
    // Representing a float between 0 and 1.
    HioFormatBC7UNorm8Vec4srgb,

    // S3TC/DXT compressed. 4-component, 4x4 blocks, unsigned byte
    // Representing a float between 0 and 1.
    HioFormatBC1UNorm8Vec4,

    // S3TC/DXT compressed. 4-component, 4x4 blocks, unsigned byte
    // Representing a float between 0 and 1.
    HioFormatBC3UNorm8Vec4,

    HioFormatCount
};

/// \enum HioAddressDimension
///
/// Available texture sampling dimensions.
///
enum HioAddressDimension
{
    HioAddressDimensionU,
    HioAddressDimensionV,
    HioAddressDimensionW
};

/// \enum HioAddressMode
///
/// Various modes used during sampling of a texture.
///
enum HioAddressMode
{
    HioAddressModeClampToEdge = 0,
    HioAddressModeMirrorClampToEdge,
    HioAddressModeRepeat,
    HioAddressModeMirrorRepeat,
    HioAddressModeClampToBorderColor
};

/// \enum HioColorChannelType
///
/// Various color channel representation formats.
///
enum HioType
{
    HioTypeUnsignedByte,
    HioTypeUnsignedByteSRGB,
    HioTypeSignedByte,
    HioTypeUnsignedShort,
    HioTypeSignedShort,
    HioTypeUnsignedInt,
    HioTypeInt,
    HioTypeHalfFloat,
    HioTypeFloat,
    HioTypeDouble,
    
    HioTypeCount
};

/// Returns the HioFormat of containing nChannels of HioType type.
HIO_API
HioFormat HioGetFormat(uint32_t nchannels,
                       HioType type,
                       bool isSRGB);

/// Return the HioType corresponding to the given HioFormat
HIO_API
HioType HioGetHioType(HioFormat);

/// Return the count of components (channels) in the given HioFormat.
HIO_API 
int HioGetComponentCount(HioFormat format);

/// Return the size in bytes for a component (channel) in the given HioFormat. 
HIO_API
size_t HioGetDataSizeOfType(HioFormat hioFormat);

/// Return the size in bytes for a component (channel) in the given HioType.
HIO_API
size_t HioGetDataSizeOfType(HioType type);

/// Returns the size of bytes per pixel for the given HioFormat
HIO_API
size_t HioGetDataSizeOfFormat(HioFormat format,
                             size_t *blockWidth = nullptr,
                             size_t *blockHeight = nullptr);

/// Return if the given format is compressed.
HIO_API
bool HioIsCompressed(HioFormat format);

/// Calculate the byte size of texture. If compressed, takes block size
/// into account.
HIO_API
size_t HioGetDataSize(const HioFormat hioFormat, const GfVec3i &dimensions);

PXR_NAMESPACE_CLOSE_SCOPE

#endif