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SPV: Fix array strides by explicitly computing them in the getBaseAlignment() algorithm.

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This commit is contained in:
John Kessenich 2015-12-29 17:11:44 -07:00
parent e0b6cad44f
commit 4998789d4e
9 changed files with 83 additions and 61 deletions
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25
SPIRV/GlslangToSpv.cpp
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@ -1707,25 +1707,25 @@ glslang::TLayoutPacking TGlslangToSpvTraverser::getExplicitLayout(const glslang:
int TGlslangToSpvTraverser::getArrayStride(const glslang::TType& arrayType, glslang::TLayoutPacking explicitLayout, glslang::TLayoutMatrix matrixLayout)
{
int size;
int stride = glslangIntermediate->getBaseAlignment(arrayType, size, explicitLayout == glslang::ElpStd140, matrixLayout == glslang::ElmRowMajor);
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 (matrixLayout == glslang::ElmRowMajor)
stride *= arrayType.getMatrixRows();
else
stride *= arrayType.getMatrixCols();
}
int stride;
glslangIntermediate->getBaseAlignment(arrayType, size, stride, explicitLayout == glslang::ElpStd140, matrixLayout == glslang::ElmRowMajor);
return stride;
}
// Given a matrix type, returns the integer stride required for that matrix
// Given a matrix type, or array (of array) of matrixes 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, glslang::TLayoutPacking explicitLayout, glslang::TLayoutMatrix matrixLayout)
{
glslang::TType elementType;
elementType.shallowCopy(matrixType);
elementType.clearArraySizes();
int size;
return glslangIntermediate->getBaseAlignment(matrixType, size, explicitLayout == glslang::ElpStd140, matrixLayout == glslang::ElmRowMajor);
int stride;
glslangIntermediate->getBaseAlignment(elementType, size, stride, explicitLayout == glslang::ElpStd140, matrixLayout == glslang::ElmRowMajor);
return stride;
}
// Given a member type of a struct, realign the current offset for it, and compute
@ -1764,7 +1764,8 @@ void TGlslangToSpvTraverser::updateMemberOffset(const glslang::TType& structType
// but possibly not yet correctly aligned.
int memberSize;
int memberAlignment = glslangIntermediate->getBaseAlignment(memberType, memberSize, explicitLayout == glslang::ElpStd140, matrixLayout == glslang::ElmRowMajor);
int dummyStride;
int memberAlignment = glslangIntermediate->getBaseAlignment(memberType, memberSize, dummyStride, explicitLayout == glslang::ElpStd140, matrixLayout == glslang::ElmRowMajor);
glslang::RoundToPow2(currentOffset, memberAlignment);
nextOffset = currentOffset + memberSize;
}

4
Test/baseResults/spv.layoutNested.vert.out
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@ -100,7 +100,7 @@ Linked vertex stage:
MemberDecorate 14(S) 1 Offset 16
MemberDecorate 14(S) 1 MatrixStride 16
MemberDecorate 14(S) 2 Offset 144
Decorate 18 ArrayStride 16
Decorate 18 ArrayStride 480
MemberDecorate 19(Block140) 0 Offset 0
MemberDecorate 19(Block140) 1 Offset 16
MemberDecorate 19(Block140) 2 Offset 976
@ -113,7 +113,7 @@ Linked vertex stage:
MemberDecorate 22(S) 1 Offset 16
MemberDecorate 22(S) 1 MatrixStride 8
MemberDecorate 22(S) 2 Offset 80
Decorate 24 ArrayStride 16
Decorate 24 ArrayStride 288
MemberDecorate 25(Block430) 0 Offset 0
MemberDecorate 25(Block430) 1 Offset 16
MemberDecorate 25(Block430) 2 Offset 592

4
glslang/Include/Types.h
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@ -1206,6 +1206,10 @@ public:
arraySizes = new TArraySizes;
*arraySizes = s;
}
void clearArraySizes()
{
arraySizes = 0;
}
void addArrayOuterSizes(const TArraySizes& s)
{
if (arraySizes == nullptr)

3
glslang/MachineIndependent/ParseHelper.cpp
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@ -5353,7 +5353,8 @@ void TParseContext::fixBlockUniformOffsets(TQualifier& qualifier, TTypeList& typ
// modify just the children's view of matrix layout, if there is one for this member
TLayoutMatrix subMatrixLayout = typeList[member].type->getQualifier().layoutMatrix;
int memberAlignment = intermediate.getBaseAlignment(*typeList[member].type, memberSize, qualifier.layoutPacking == ElpStd140,
int dummyStride;
int memberAlignment = intermediate.getBaseAlignment(*typeList[member].type, memberSize, dummyStride, qualifier.layoutPacking == ElpStd140,
subMatrixLayout != ElmNone ? subMatrixLayout == ElmRowMajor : qualifier.layoutMatrix == ElmRowMajor);
if (memberQualifier.hasOffset()) {
// "The specified offset must be a multiple

30
glslang/MachineIndependent/linkValidate.cpp
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@ -858,8 +858,14 @@ int TIntermediate::getBaseAlignmentScalar(const TType& type, int& size)
// otherwise it does not, yielding std430 rules.
//
// The size is returned in the 'size' parameter
//
// The stride is only non-0 for arrays or matrices, and is the stride of the
// top-level object nested within the type. E.g., for an array of matrices,
// it is the distances needed between matrices, despite the rules saying the
// stride comes from the flattening down to vectors.
//
// Return value is the alignment of the type.
int TIntermediate::getBaseAlignment(const TType& type, int& size, bool std140, bool rowMajor)
int TIntermediate::getBaseAlignment(const TType& type, int& size, int& stride, bool std140, bool rowMajor)
{
int alignment;
@ -916,16 +922,23 @@ int TIntermediate::getBaseAlignment(const TType& type, int& size, bool std140, b
//
// 10. If the member is an array of S structures, the S elements of the array are laid
// out in order, according to rule (9).
//
// Assuming, for rule 10: The stride is the same as the size of an element.
// rules 4, 6, and 8
stride = 0;
int dummyStride;
// rules 4, 6, 8, and 10
if (type.isArray()) {
// TODO: perf: this might be flattened by using getCumulativeArraySize(), and a deref that discards all arrayness
TType derefType(type, 0);
alignment = getBaseAlignment(derefType, size, std140, rowMajor);
alignment = getBaseAlignment(derefType, size, dummyStride, std140, rowMajor);
if (std140)
alignment = std::max(baseAlignmentVec4Std140, alignment);
RoundToPow2(size, alignment);
size *= type.getOuterArraySize();
stride = size; // uses full matrix size for stride of an array of matrices (not quite what rule 6/8, but what's expected)
// uses the assumption for rule 10 in the comment above
size = stride * type.getOuterArraySize();
return alignment;
}
@ -939,7 +952,7 @@ int TIntermediate::getBaseAlignment(const TType& type, int& size, bool std140, b
int memberSize;
// modify just the children's view of matrix layout, if there is one for this member
TLayoutMatrix subMatrixLayout = memberList[m].type->getQualifier().layoutMatrix;
int memberAlignment = getBaseAlignment(*memberList[m].type, memberSize, std140,
int memberAlignment = getBaseAlignment(*memberList[m].type, memberSize, dummyStride, std140,
(subMatrixLayout != ElmNone) ? (subMatrixLayout == ElmRowMajor) : rowMajor);
maxAlignment = std::max(maxAlignment, memberAlignment);
RoundToPow2(size, memberAlignment);
@ -971,14 +984,15 @@ int TIntermediate::getBaseAlignment(const TType& type, int& size, bool std140, b
// rule 5: deref to row, not to column, meaning the size of vector is num columns instead of num rows
TType derefType(type, 0, type.getQualifier().layoutMatrix == ElmRowMajor);
alignment = getBaseAlignment(derefType, size, std140, rowMajor);
alignment = getBaseAlignment(derefType, size, dummyStride, std140, rowMajor);
if (std140)
alignment = std::max(baseAlignmentVec4Std140, alignment);
RoundToPow2(size, alignment);
stride = size; // use intra-matrix stride for stride of a just a matrix
if (rowMajor)
size *= type.getMatrixRows();
size = stride * type.getMatrixRows();
else
size *= type.getMatrixCols();
size = stride * type.getMatrixCols();
return alignment;
}

2
glslang/MachineIndependent/localintermediate.h
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@ -305,7 +305,7 @@ public:
}
int addXfbBufferOffset(const TType&);
unsigned int computeTypeXfbSize(const TType&, bool& containsDouble) const;
static int getBaseAlignment(const TType&, int& size, bool std140, bool rowMajor);
static int getBaseAlignment(const TType&, int& size, int& stride, bool std140, bool rowMajor);
protected:
void error(TInfoSink& infoSink, const char*);

6
glslang/MachineIndependent/reflection.cpp
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@ -121,11 +121,12 @@ public:
return memberList[index].type->getQualifier().layoutOffset;
int memberSize;
int dummyStride;
int offset = 0;
for (int m = 0; m <= index; ++m) {
// modify just the children's view of matrix layout, if there is one for this member
TLayoutMatrix subMatrixLayout = memberList[m].type->getQualifier().layoutMatrix;
int memberAlignment = intermediate.getBaseAlignment(*memberList[m].type, memberSize, type.getQualifier().layoutPacking == ElpStd140,
int memberAlignment = intermediate.getBaseAlignment(*memberList[m].type, memberSize, dummyStride, type.getQualifier().layoutPacking == ElpStd140,
subMatrixLayout != ElmNone ? subMatrixLayout == ElmRowMajor : type.getQualifier().layoutMatrix == ElmRowMajor);
RoundToPow2(offset, memberAlignment);
if (m < index)
@ -144,7 +145,8 @@ public:
int lastOffset = getOffset(blockType, lastIndex);
int lastMemberSize;
intermediate.getBaseAlignment(*memberList[lastIndex].type, lastMemberSize, blockType.getQualifier().layoutPacking == ElpStd140,
int dummyStride;
intermediate.getBaseAlignment(*memberList[lastIndex].type, lastMemberSize, dummyStride, blockType.getQualifier().layoutPacking == ElpStd140,
blockType.getQualifier().layoutMatrix == ElmRowMajor);
return lastOffset + lastMemberSize;