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// cpu-texture.cpp
#include "cpu-texture.h"
namespace gfx
{
using namespace Slang;
namespace cpu
{
static CPUTextureBaseShapeInfo const* _getBaseShapeInfo(ITextureResource::Type baseShape)
{
return &kCPUTextureBaseShapeInfos[(int)baseShape];
}
template<int N>
void _unpackFloatTexel(void const* texelData, void* outData, size_t outSize)
{
auto input = (float const*)texelData;
float temp[4] = {0.0f, 0.0f, 0.0f, 1.0f};
for (int i = 0; i < N; ++i)
temp[i] = input[i];
memcpy(outData, temp, outSize);
}
template<int N>
void _unpackFloat16Texel(void const* texelData, void* outData, size_t outSize)
{
auto input = (int16_t const*)texelData;
float temp[4] = {0.0f, 0.0f, 0.0f, 1.0f};
for (int i = 0; i < N; ++i)
temp[i] = HalfToFloat(input[i]);
memcpy(outData, temp, outSize);
}
static inline float _unpackUnorm8Value(uint8_t value)
{
return value / 255.0f;
}
template<int N>
void _unpackUnorm8Texel(void const* texelData, void* outData, size_t outSize)
{
auto input = (uint8_t const*)texelData;
float temp[4] = {0.0f, 0.0f, 0.0f, 1.0f};
for (int i = 0; i < N; ++i)
temp[i] = _unpackUnorm8Value(input[i]);
memcpy(outData, temp, outSize);
}
void _unpackUnormBGRA8Texel(void const* texelData, void* outData, size_t outSize)
{
auto input = (uint8_t const*)texelData;
float temp[4];
temp[0] = _unpackUnorm8Value(input[2]);
temp[1] = _unpackUnorm8Value(input[1]);
temp[2] = _unpackUnorm8Value(input[0]);
temp[3] = _unpackUnorm8Value(input[3]);
memcpy(outData, temp, outSize);
}
template<int N>
void _unpackUInt16Texel(void const* texelData, void* outData, size_t outSize)
{
auto input = (uint16_t const*)texelData;
uint32_t temp[4] = {0, 0, 0, 0};
for (int i = 0; i < N; ++i)
temp[i] = input[i];
memcpy(outData, temp, outSize);
}
template<int N>
void _unpackUInt32Texel(void const* texelData, void* outData, size_t outSize)
{
auto input = (uint32_t const*)texelData;
uint32_t temp[4] = {0, 0, 0, 0};
for (int i = 0; i < N; ++i)
temp[i] = input[i];
memcpy(outData, temp, outSize);
}
TextureResourceImpl::~TextureResourceImpl()
{
free(m_data);
}
Result TextureResourceImpl::init(ITextureResource::SubresourceData const* initData)
{
auto desc = m_desc;
// The format of the texture will determine the
// size of the texels we allocate.
//
// TODO: Compressed formats usually work in terms
// of a fixed block size, so that we cannot actually
// compute a simple `texelSize` like this. Instead
// we should be computing a `blockSize` and then
// a `blockExtents` value that gives the extent
// in texels of each block. For uncompressed formats
// the block extents would be 1 along each axis.
//
auto format = desc.format;
FormatInfo texelInfo;
gfxGetFormatInfo(format, &texelInfo);
uint32_t texelSize = uint32_t(texelInfo.blockSizeInBytes / texelInfo.pixelsPerBlock);
m_texelSize = texelSize;
int32_t formatBlockSize[kMaxRank] = {1, 1, 1};
auto baseShapeInfo = _getBaseShapeInfo(desc.type);
m_baseShape = baseShapeInfo;
if (!baseShapeInfo)
return SLANG_FAIL;
auto formatInfo = _getFormatInfo(desc.format);
m_formatInfo = formatInfo;
if (!formatInfo)
return SLANG_FAIL;
int32_t rank = baseShapeInfo->rank;
int32_t effectiveArrayElementCount = desc.arraySize ? desc.arraySize : 1;
effectiveArrayElementCount *= baseShapeInfo->implicitArrayElementCount;
m_effectiveArrayElementCount = effectiveArrayElementCount;
int32_t extents[kMaxRank];
extents[0] = desc.size.width;
extents[1] = desc.size.height;
extents[2] = desc.size.depth;
for (int32_t axis = rank; axis < kMaxRank; ++axis)
extents[axis] = 1;
int32_t levelCount = desc.numMipLevels;
m_mipLevels.setCount(levelCount);
int64_t totalDataSize = 0;
for (int32_t levelIndex = 0; levelIndex < levelCount; ++levelIndex)
{
auto& level = m_mipLevels[levelIndex];
for (int32_t axis = 0; axis < kMaxRank; ++axis)
{
int32_t extent = extents[axis] >> levelIndex;
if (extent < 1)
extent = 1;
level.extents[axis] = extent;
}
level.strides[0] = texelSize;
for (int32_t axis = 1; axis < kMaxRank + 1; ++axis)
{
level.strides[axis] = level.strides[axis - 1] * level.extents[axis - 1];
}
int64_t levelDataSize = texelSize;
levelDataSize *= effectiveArrayElementCount;
for (int32_t axis = 0; axis < rank; ++axis)
levelDataSize *= int64_t(level.extents[axis]);
level.offset = totalDataSize;
totalDataSize += levelDataSize;
}
void* textureData = malloc((size_t)totalDataSize);
m_data = textureData;
if (initData)
{
int32_t subResourceCounter = 0;
for (int32_t arrayElementIndex = 0; arrayElementIndex < effectiveArrayElementCount;
++arrayElementIndex)
{
for (int32_t mipLevel = 0; mipLevel < m_desc.numMipLevels; ++mipLevel)
{
int32_t subResourceIndex = subResourceCounter++;
auto dstRowStride = m_mipLevels[mipLevel].strides[1];
auto dstLayerStride = m_mipLevels[mipLevel].strides[2];
auto dstArrayStride = m_mipLevels[mipLevel].strides[3];
auto textureRowSize = m_mipLevels[mipLevel].extents[0] * texelSize;
auto rowCount = m_mipLevels[mipLevel].extents[1];
auto depthLayerCount = m_mipLevels[mipLevel].extents[2];
auto& srcImage = initData[subResourceIndex];
ptrdiff_t srcRowStride = ptrdiff_t(srcImage.strideY);
ptrdiff_t srcLayerStride = ptrdiff_t(srcImage.strideZ);
char* dstLevel = (char*)textureData + m_mipLevels[mipLevel].offset;
char* dstImage = dstLevel + dstArrayStride * arrayElementIndex;
const char* srcLayer = (const char*)srcImage.data;
char* dstLayer = dstImage;
for (int32_t depthLayer = 0; depthLayer < depthLayerCount; ++depthLayer)
{
const char* srcRow = srcLayer;
char* dstRow = dstLayer;
for (int32_t row = 0; row < rowCount; ++row)
{
memcpy(dstRow, srcRow, textureRowSize);
srcRow += srcRowStride;
dstRow += dstRowStride;
}
srcLayer += srcLayerStride;
dstLayer += dstLayerStride;
}
}
}
}
return SLANG_OK;
}
} // namespace cpu
} // namespace gfx
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