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// cpu-resource-views.cpp
#include "cpu-resource-views.h"
namespace gfx
{
using namespace Slang;
namespace cpu
{
ResourceViewImpl::ResourceViewImpl(Kind kind, Desc const& desc)
: m_kind(kind)
{
m_desc = desc;
}
BufferResourceImpl* BufferResourceViewImpl::getBuffer() const
{
return m_buffer;
}
TextureResourceImpl* TextureResourceViewImpl::getTexture() const
{
return m_texture;
}
slang_prelude::TextureDimensions TextureResourceViewImpl::GetDimensions(int mipLevel)
{
slang_prelude::TextureDimensions dimensions = {};
TextureResourceImpl* texture = m_texture;
auto& desc = texture->_getDesc();
auto baseShape = texture->m_baseShape;
dimensions.arrayElementCount = desc.arraySize;
dimensions.numberOfLevels = desc.numMipLevels;
dimensions.shape = baseShape->rank;
dimensions.width = desc.size.width;
dimensions.height = desc.size.height;
dimensions.depth = desc.size.depth;
return dimensions;
}
void TextureResourceViewImpl::Load(const int32_t* texelCoords, void* outData, size_t dataSize)
{
void* texelPtr = _getTexelPtr(texelCoords);
m_texture->m_formatInfo->unpackFunc(texelPtr, outData, dataSize);
}
void TextureResourceViewImpl::Sample(
slang_prelude::SamplerState samplerState,
const float* coords,
void* outData,
size_t dataSize)
{
// We have no access to information from fragment quads, so we cannot
// compute the finite-difference derivatives needed from `coords`.
//
// The only reasonable thing to do is to sample mip level zero.
//
SampleLevel(samplerState, coords, 0.0f, outData, dataSize);
}
void TextureResourceViewImpl::SampleLevel(
slang_prelude::SamplerState samplerState,
const float* coords,
float level,
void* outData,
size_t dataSize)
{
TextureResourceImpl* texture = m_texture;
auto baseShape = texture->m_baseShape;
auto& desc = texture->_getDesc();
int32_t rank = baseShape->rank;
int32_t baseCoordCount = baseShape->baseCoordCount;
int32_t integerMipLevel = int32_t(level + 0.5f);
if (integerMipLevel >= desc.numMipLevels)
integerMipLevel = desc.numMipLevels - 1;
if (integerMipLevel < 0)
integerMipLevel = 0;
auto& mipLevelInfo = texture->m_mipLevels[integerMipLevel];
bool isArray = (desc.arraySize != 0) || (desc.type == ITextureResource::Type::TextureCube);
int32_t effectiveArrayElementCount = texture->m_effectiveArrayElementCount;
int32_t coordIndex = baseCoordCount;
int32_t elementIndex = 0;
if (isArray)
{
elementIndex = int32_t(coords[coordIndex++] + 0.5f);
}
if (elementIndex >= effectiveArrayElementCount)
elementIndex = effectiveArrayElementCount - 1;
if (elementIndex < 0)
elementIndex = 0;
// Note: for now we are just going to do nearest-neighbor sampling
//
int64_t texelOffset = mipLevelInfo.offset;
texelOffset += elementIndex * mipLevelInfo.strides[3];
for (int32_t axis = 0; axis < rank; ++axis)
{
int32_t extent = mipLevelInfo.extents[axis];
float coord = coords[axis];
// TODO: deal with wrap/clamp/repeat if `coord < 0` or `coord > 1`
int32_t integerCoord = int32_t(coord * (extent - 1) + 0.5f);
if (integerCoord >= extent)
integerCoord = extent - 1;
if (integerCoord < 0)
integerCoord = 0;
texelOffset += integerCoord * mipLevelInfo.strides[axis];
}
auto texelPtr = (char const*)texture->m_data + texelOffset;
m_texture->m_formatInfo->unpackFunc(texelPtr, outData, dataSize);
}
void* TextureResourceViewImpl::refAt(const uint32_t* texelCoords)
{
return _getTexelPtr((int32_t const*)texelCoords);
}
void* TextureResourceViewImpl::_getTexelPtr(int32_t const* texelCoords)
{
TextureResourceImpl* texture = m_texture;
auto baseShape = texture->m_baseShape;
auto& desc = texture->_getDesc();
int32_t rank = baseShape->rank;
int32_t baseCoordCount = baseShape->baseCoordCount;
bool isArray = (desc.arraySize != 0) || (desc.type == ITextureResource::Type::TextureCube);
bool isMultisample = desc.sampleDesc.numSamples > 1;
bool isBuffer = desc.type == ITextureResource::Type::Buffer;
bool hasMipLevels = !(isMultisample || isBuffer);
int32_t effectiveArrayElementCount = texture->m_effectiveArrayElementCount;
int32_t coordIndex = baseCoordCount;
int32_t elementIndex = 0;
if (isArray)
{
elementIndex = texelCoords[coordIndex++];
}
if (elementIndex >= effectiveArrayElementCount)
elementIndex = effectiveArrayElementCount - 1;
if (elementIndex < 0)
elementIndex = 0;
int32_t mipLevel = 0;
if (!hasMipLevels)
{
mipLevel = texelCoords[coordIndex++];
}
if (mipLevel >= desc.numMipLevels)
mipLevel = desc.numMipLevels - 1;
if (mipLevel < 0)
mipLevel = 0;
auto& mipLevelInfo = texture->m_mipLevels[mipLevel];
int64_t texelOffset = mipLevelInfo.offset;
texelOffset += elementIndex * mipLevelInfo.strides[3];
for (int32_t axis = 0; axis < rank; ++axis)
{
int32_t coord = texelCoords[axis];
if (coord >= mipLevelInfo.extents[axis])
coord = mipLevelInfo.extents[axis] - 1;
if (coord < 0)
coord = 0;
texelOffset += texelCoords[axis] * mipLevelInfo.strides[axis];
}
return (char*)texture->m_data + texelOffset;
}
} // namespace cpu
} // namespace gfx
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