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shader: specialize cube image descriptors (#134)

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* shader: specialize cube image descriptors

Track whether image descriptors refer to cube maps during resource specialization, and apply the coordinate offset conversion when sampling cube maps as 2D image arrays in SPIR-V emission.

* shader: fix cube array coordinate lowering

---------

Co-authored-by: nmzik <Nmzik@mail.ru>
This commit is contained in:
Nikos
2026-07-31 04:59:10 +03:00
committed by GitHub
parent d475387171
commit 3b75a5659a
5 changed files with 155 additions and 56 deletions
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tests/shaderCfgTests.cpp
+32
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@@ -3020,6 +3020,37 @@ void TestNewShaderRecompilerImageQueryLowering() {
CheckSpirvBinaryValidates(result.spirv);
}
void TestNewShaderRecompilerCubeSampleCoordinates() {
constexpr uint32_t MimgDimCube = 3;
const uint32_t shader[] = {
EncodeMimg0(0x20, 0xf, false, MimgDimCube),
EncodeMimg1(0, 0, 1, 0), // image_sample cube
EncodeMimg0(0x60, 0x3, false, MimgDimCube),
EncodeMimg1(8, 0, 1, 4), // image_get_lod cube
0xbf810000u,
};
auto user_data = ImageTestUserData(Prospero::ImageType::kCube);
ShaderRecompiler::CompileOptions options;
options.stage = ShaderType::Compute;
options.user_data = user_data.data();
ShaderRecompiler::CompileResult result;
std::string error;
Check(ShaderRecompiler::TryRecompile(shader, options, result, &error), error.c_str());
Check(result.program.info.images.size() == 1 && result.program.info.images[0].cube,
"cube descriptor identity was not preserved through compilation");
Check(SpirvInstructionOpcodeCount(result.spirv, 131) == 4,
"cube sample/get-lod did not remove the RDNA2 S/T bias");
Check(SpirvInstructionOpcodeCount(result.spirv, 109) == 1 &&
SpirvInstructionOpcodeCount(result.spirv, 112) == 1 &&
SpirvInstructionOpcodeCount(result.spirv, 194) == 1 &&
SpirvInstructionOpcodeCount(result.spirv, 196) == 1 &&
SpirvInstructionOpcodeCount(result.spirv, 130) == 1,
"cube sample did not repack its face ID exactly once, or get-lod used an array layer");
CheckSpirvBinaryValidates(result.spirv);
}
void TestNewShaderRecompilerImageSampleVariants() {
const uint32_t shader[] = {
EncodeMimg0(0x24, 0xf),
@@ -6957,6 +6988,7 @@ int main() {
TestNewShaderRecompilerScalarBitfieldAlu();
TestNewShaderRecompilerMemoryFamilyLowering();
TestNewShaderRecompilerImageQueryLowering();
TestNewShaderRecompilerCubeSampleCoordinates();
TestNewShaderRecompilerImageSampleVariants();
TestNewShaderRecompilerImageSampleA16SamplerCoords();
TestNewShaderRecompilerImageSampleOpcodeAliases();