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GL_EXT_vulkan_glsl_relaxed - retarget gl_VertexID to gl_VertexIndex

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instead of allowing for multiple declarations of the variable in the
resulting SPIR-V, instead use a retargeted mechanism to cause references
to gl_VertexID and gl_InstanceID to use the gl_VertexIndex and
gl_InstanceIndex symbol.
This commit is contained in:
Malcolm Bechard 2021-09-16 17:40:49 -04:00
parent 80dcc36907
commit 05794b46a7
7 changed files with 133 additions and 59 deletions
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9
glslang/MachineIndependent/Initialize.cpp
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@ -7701,6 +7701,11 @@ static void BuiltInVariable(const char* name, TBuiltInVariable builtIn, TSymbolT
symQualifier.builtIn = builtIn;
}
static void RetargetVariable(const char* from, const char* to, TSymbolTable& symbolTable)
{
symbolTable.retargetSymbol(from, to);
}
//
// For built-in variables inside a named block.
// SpecialQualifier() won't ever go inside a block; their member's qualifier come
@ -7768,8 +7773,8 @@ void TBuiltIns::identifyBuiltIns(int version, EProfile profile, const SpvVersion
if (spvVersion.vulkan > 0 && spvVersion.vulkanRelaxed) {
// treat these built-ins as aliases of VertexIndex and InstanceIndex
BuiltInVariable("gl_VertexID", EbvVertexIndex, symbolTable);
BuiltInVariable("gl_InstanceID", EbvInstanceIndex, symbolTable);
RetargetVariable("gl_InstanceID", "gl_InstanceIndex", symbolTable);
RetargetVariable("gl_VertexID", "gl_VertexIndex", symbolTable);
}
if (profile != EEsProfile) {