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// shader-renderer-util.cpp
#include "shader-renderer-util.h"
namespace renderer_test {
using namespace Slang;
using Slang::Result;
inline int calcMipSize(int size, int level)
{
size = size >> level;
return size > 0 ? size : 1;
}
inline Extents calcMipSize(Extents size, int mipLevel)
{
Extents rs;
rs.width = calcMipSize(size.width, mipLevel);
rs.height = calcMipSize(size.height, mipLevel);
rs.depth = calcMipSize(size.depth, mipLevel);
return rs;
}
/// Given the type works out the maximum dimension size
inline int calcMaxDimension(Extents size, TextureType type)
{
switch (type)
{
case TextureType::Texture1D:
return size.width;
case TextureType::Texture3D:
return Math::Max(Math::Max(size.width, size.height), size.depth);
case TextureType::TextureCube: // fallthru
case TextureType::Texture2D:
{
return Math::Max(size.width, size.height);
}
default:
return 0;
}
}
/// Given the type, calculates the number of mip maps. 0 on error
inline int calcNumMipLevels(TextureType type, Extents size)
{
const int maxDimensionSize = calcMaxDimension(size, type);
return (maxDimensionSize > 0) ? (Math::Log2Floor(maxDimensionSize) + 1) : 0;
}
/* static */ Result ShaderRendererUtil::generateTexture(
const InputTextureDesc& inputDesc,
ResourceState defaultState,
IDevice* device,
ComPtr<ITexture>& textureOut)
{
TextureData texData;
generateTextureData(texData, inputDesc);
return createTexture(inputDesc, texData, defaultState, device, textureOut);
}
/* static */ Result ShaderRendererUtil::createTexture(
const InputTextureDesc& inputDesc,
const TextureData& texData,
ResourceState defaultState,
IDevice* device,
ComPtr<ITexture>& textureOut)
{
TextureDesc textureDesc = {};
// Default to R8G8B8A8_UNORM
const Format format = (inputDesc.format == Format::Unknown) ? Format::R8G8B8A8_UNORM : inputDesc.format;
textureDesc.sampleCount = inputDesc.sampleCount;
textureDesc.format = format;
textureDesc.mipLevelCount = texData.m_mipLevels;
textureDesc.arrayLength = inputDesc.arrayLength > 0 ? inputDesc.arrayLength : 1;
textureDesc.usage = TextureUsage::CopyDestination | TextureUsage::CopySource;
switch (defaultState)
{
case ResourceState::ShaderResource:
textureDesc.usage |= TextureUsage::ShaderResource;
break;
case ResourceState::UnorderedAccess:
textureDesc.usage |= TextureUsage::UnorderedAccess;
break;
default:
return SLANG_FAIL;
}
textureDesc.defaultState = defaultState;
// It's the same size in all dimensions
switch (inputDesc.dimension)
{
case 1:
{
textureDesc.type = TextureType::Texture1D;
textureDesc.size.width = inputDesc.size;
textureDesc.size.height = 1;
textureDesc.size.depth = 1;
break;
}
case 2:
{
textureDesc.type = inputDesc.isCube ? TextureType::TextureCube : TextureType::Texture2D;
textureDesc.size.width = inputDesc.size;
textureDesc.size.height = inputDesc.size;
textureDesc.size.depth = 1;
break;
}
case 3:
{
textureDesc.type = TextureType::Texture3D;
textureDesc.size.width = inputDesc.size;
textureDesc.size.height = inputDesc.size;
textureDesc.size.depth = inputDesc.size;
break;
}
}
if (textureDesc.mipLevelCount == 0)
{
textureDesc.mipLevelCount = calcNumMipLevels(textureDesc.type, textureDesc.size);
}
List<SubresourceData> initSubresources;
int arrayLayerCount = textureDesc.arrayLength * (textureDesc.type == TextureType::TextureCube ? 6 : 1);
int subResourceCounter = 0;
for( int a = 0; a < arrayLayerCount; ++a )
{
for( int m = 0; m < textureDesc.mipLevelCount; ++m )
{
int subResourceIndex = subResourceCounter++;
const int mipWidth = calcMipSize(textureDesc.size.width, m);
const int mipHeight = calcMipSize(textureDesc.size.height, m);
auto strideY = mipWidth * sizeof(uint32_t);
auto strideZ = mipHeight * strideY;
SubresourceData subresourceData;
subresourceData.data = texData.m_slices[subResourceIndex].values;
subresourceData.strideY = strideY;
subresourceData.strideZ = strideZ;
initSubresources.add(subresourceData);
}
}
textureOut = device->createTexture(textureDesc, initSubresources.getBuffer());
return textureOut ? SLANG_OK : SLANG_FAIL;
}
/* static */ Result ShaderRendererUtil::createBuffer(
const InputBufferDesc& inputDesc,
size_t bufferSize,
const void* initData,
IDevice* device,
Slang::ComPtr<IBuffer>& bufferOut)
{
BufferDesc bufferDesc;
bufferDesc.size = bufferSize;
bufferDesc.format = inputDesc.format;
bufferDesc.elementSize = inputDesc.stride;
bufferDesc.usage = BufferUsage::CopyDestination | BufferUsage::CopySource | BufferUsage::ShaderResource | BufferUsage::UnorderedAccess;
bufferDesc.defaultState = ResourceState::UnorderedAccess;
ComPtr<IBuffer> bufferResource = device->createBuffer(bufferDesc, initData);
if (!bufferResource)
{
return SLANG_FAIL;
}
bufferOut = bufferResource;
return SLANG_OK;
}
static SamplerDesc _calcSamplerDesc(const InputSamplerDesc& srcDesc)
{
SamplerDesc samplerDesc;
if (srcDesc.isCompareSampler)
{
samplerDesc.reductionOp = TextureReductionOp::Comparison;
samplerDesc.comparisonFunc = ComparisonFunc::Less;
}
return samplerDesc;
}
ComPtr<ISampler> _createSampler(IDevice* device,
const InputSamplerDesc& srcDesc)
{
return device->createSampler(_calcSamplerDesc(srcDesc));
}
} // renderer_test
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