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SPV: Distinguish between std140 and std430 layouts, and correctly use alignments as the base for strides.

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This commit is contained in:
John Kessenich 2015-12-06 19:17:49 -07:00
parent dd6ca17845
commit e721f49dbd
3 changed files with 14 additions and 6 deletions
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16
SPIRV/GlslangToSpv.cpp
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@ -1630,10 +1630,18 @@ bool TGlslangToSpvTraverser::requiresExplicitLayout(const glslang::TType& type)
// 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;
int stride = glslangIntermediate->getBaseAlignment(arrayType, size, arrayType.getQualifier().layoutPacking == glslang::ElpStd140);
if (arrayType.isMatrix()) {
// GLSL strides are set to alignments of the matrix flattened to individual rows/cols,
// but SPV needs an array stride for the whole matrix, not the rows/cols
if (arrayType.getQualifier().layoutMatrix == glslang::ElmRowMajor)
stride *= arrayType.getMatrixRows();
else
stride *= arrayType.getMatrixCols();
}
return stride;
}
// Given a matrix type, returns the integer stride required for that matrix
@ -1641,7 +1649,7 @@ int TGlslangToSpvTraverser::getArrayStride(const glslang::TType& arrayType)
int TGlslangToSpvTraverser::getMatrixStride(const glslang::TType& matrixType)
{
int size;
return glslangIntermediate->getBaseAlignment(matrixType, size, true);
return glslangIntermediate->getBaseAlignment(matrixType, size, matrixType.getQualifier().layoutPacking == glslang::ElpStd140);
}
// Given a member type of a struct, realign the current offset for it, and compute

2
Test/baseResults/spv.140.frag.out
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@ -54,7 +54,7 @@ Linked fragment stage:
MemberDecorate 88(bn) 4 Offset 640
MemberDecorate 88(bn) 4 MatrixStride 16
Decorate 88(bn) Block
Decorate 92 ArrayStride 12
Decorate 92 ArrayStride 16
MemberDecorate 93(bi) 0 Offset 0
Decorate 93(bi) Block
2: TypeVoid

2
glslang/Include/revision.h
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@ -2,5 +2,5 @@
// For the version, it uses the latest git tag followed by the number of commits.
// For the date, it uses the current date (when then script is run).
#define GLSLANG_REVISION "SPIRV99.821"
#define GLSLANG_REVISION "SPIRV99.822"
#define GLSLANG_DATE "06-Dec-2015"