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Add --hlsl-dx-position-w option

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This reciprocates the w component of SV_Position in HLSL fragment shaders
to provide DirectX compatibility for HLSL shaders in Vulkan.

Fixes #2244
This commit is contained in:
Greg Fischer 2021-11-16 18:42:12 -07:00
parent 8a7860e4cb
commit e9564feb55
9 changed files with 323 additions and 2 deletions
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8
StandAlone/StandAlone.cpp
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@ -177,6 +177,7 @@ const char* shaderStageName = nullptr;
const char* variableName = nullptr;
bool HlslEnable16BitTypes = false;
bool HlslDX9compatible = false;
bool HlslDxPositionW = false;
bool DumpBuiltinSymbols = false;
std::vector<std::string> IncludeDirectoryList;
@ -662,6 +663,8 @@ void ProcessArguments(std::vector<std::unique_ptr<glslang::TWorkItem>>& workItem
HlslEnable16BitTypes = true;
} else if (lowerword == "hlsl-dx9-compatible") {
HlslDX9compatible = true;
} else if (lowerword == "hlsl-dx-position-w") {
HlslDxPositionW = true;
} else if (lowerword == "auto-sampled-textures") {
autoSampledTextures = true;
} else if (lowerword == "invert-y" || // synonyms
@ -1284,6 +1287,9 @@ void CompileAndLinkShaderUnits(std::vector<ShaderCompUnit> compUnits)
if (Options & EOptionInvertY)
shader->setInvertY(true);
if (HlslDxPositionW)
shader->setDxPositionW(true);
// Set up the environment, some subsettings take precedence over earlier
// ways of setting things.
if (Options & EOptionSpv) {
@ -1847,6 +1853,8 @@ void usage()
" --hlsl-dx9-compatible interprets sampler declarations as a\n"
" texture/sampler combo like DirectX9 would,\n"
" and recognizes DirectX9-specific semantics\n"
" --hlsl-dx-position-w W component of SV_Position in HLSL fragment\n"
" shaders compatible with DirectX\n"
" --invert-y | --iy invert position.Y output in vertex shader\n"
" --keep-uncalled | --ku don't eliminate uncalled functions\n"
" --nan-clamp favor non-NaN operand in min, max, and clamp\n"