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Merge pull request #68 from jekstrand/stride-decorations

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SPIRV: Decorate matrices and arrays with their strides
This commit is contained in:
John Kessenich 2015-09-09 16:12:35 -06:00
commit d2386d0ea9
1 changed files with 24 additions and 0 deletions
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24
SPIRV/GlslangToSpv.cpp
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@ -88,6 +88,8 @@ protected:
spv::Id createSpvVariable(const glslang::TIntermSymbol*);
spv::Id getSampledType(const glslang::TSampler&);
spv::Id convertGlslangToSpvType(const glslang::TType& type);
int getArrayStride(const glslang::TType& arrayType);
int getMatrixStride(const glslang::TType& matrixType);
void updateMemberOffset(const glslang::TType& structType, const glslang::TType& memberType, int& currentOffset, int& nextOffset);
bool isShaderEntrypoint(const glslang::TIntermAggregate* node);
@ -1418,6 +1420,10 @@ spv::Id TGlslangToSpvTraverser::convertGlslangToSpvType(const glslang::TType& ty
offset = nextOffset;
}
if (glslangType.isMatrix()) {
builder.addMemberDecoration(spvType, member, spv::DecorationMatrixStride, getMatrixStride(glslangType));
}
// built-in variable decorations
spv::BuiltIn builtIn = TranslateBuiltInDecoration(glslangType.getQualifier().builtIn);
if (builtIn != spv::BadValue)
@ -1459,11 +1465,29 @@ spv::Id TGlslangToSpvTraverser::convertGlslangToSpvType(const glslang::TType& ty
} else
arraySize = type.getOuterArraySize();
spvType = builder.makeArrayType(spvType, arraySize);
builder.addDecoration(spvType, spv::DecorationArrayStride, getArrayStride(type));
}
return spvType;
}
// Given an array type, returns the integer stride required for that array
int TGlslangToSpvTraverser::getArrayStride(const glslang::TType& arrayType)
{
glslang::TType derefType(arrayType, 0);
int size;
glslangIntermediate->getBaseAlignment(derefType, size, true);
return size;
}
// Given a matrix type, returns the integer stride required for that matrix
// when used as a member of an interface block
int TGlslangToSpvTraverser::getMatrixStride(const glslang::TType& matrixType)
{
int size;
return glslangIntermediate->getBaseAlignment(matrixType, size, true);
}
// Given a member type of a struct, realign the current offset for it, and compute
// the next (not yet aligned) offset for the next member, which will get aligned
// on the next call.