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HLSL: matrix swizzle (_12, _m23) syntax, partial semantics.

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This partially addressess issue #670, for when the matrix swizzle
degenerates to a component or column: m[c], m[c][r] (where HLSL
swaps rows and columns for user's view).

An error message is given for the arbitrary cases not covered.

These cases will work for arbitrary use of l-values.

Future work will handle more arbitrary swizzles, which might
not work as arbitrary l-values.
This commit is contained in:
John Kessenich 2017-01-12 16:51:18 -07:00
parent 913e3b686a
commit 001dfa1c5c
6 changed files with 367 additions and 62 deletions
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148
Test/baseResults/hlsl.matrixSwizzle.vert.out Executable file
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@ -0,0 +1,148 @@
hlsl.matrixSwizzle.vert
Shader version: 450
0:? Sequence
0:2 Function Definition: ShaderFunction(f1; (temp void)
0:2 Function Parameters:
0:2 'inf' (layout(location=0 ) in float)
0:? Sequence
0:5 move second child to first child (temp float)
0:5 direct index (temp float)
0:5 direct index (temp 4-component vector of float)
0:5 'm' (temp 3X4 matrix of float)
0:5 Constant:
0:5 2 (const int)
0:5 Constant:
0:5 3 (const int)
0:5 Constant:
0:5 1.000000
0:6 move second child to first child (temp float)
0:6 direct index (temp float)
0:6 direct index (temp 4-component vector of float)
0:6 'm' (temp 3X4 matrix of float)
0:6 Constant:
0:6 2 (const int)
0:6 Constant:
0:6 3 (const int)
0:6 Constant:
0:6 2.000000
0:8 move second child to first child (temp 4-component vector of float)
0:8 direct index (temp 4-component vector of float)
0:8 'm' (temp 3X4 matrix of float)
0:8 Constant:
0:8 0 (const int)
0:8 Constant:
0:8 3.000000
0:8 3.000000
0:8 3.000000
0:8 3.000000
0:9 move second child to first child (temp 4-component vector of float)
0:9 direct index (temp 4-component vector of float)
0:9 'm' (temp 3X4 matrix of float)
0:9 Constant:
0:9 1 (const int)
0:9 Constant:
0:9 3.000000
0:9 3.000000
0:9 3.000000
0:9 3.000000
0:? Linker Objects
0:? 'inf' (layout(location=0 ) in float)
Linked vertex stage:
Shader version: 450
0:? Sequence
0:2 Function Definition: ShaderFunction(f1; (temp void)
0:2 Function Parameters:
0:2 'inf' (layout(location=0 ) in float)
0:? Sequence
0:5 move second child to first child (temp float)
0:5 direct index (temp float)
0:5 direct index (temp 4-component vector of float)
0:5 'm' (temp 3X4 matrix of float)
0:5 Constant:
0:5 2 (const int)
0:5 Constant:
0:5 3 (const int)
0:5 Constant:
0:5 1.000000
0:6 move second child to first child (temp float)
0:6 direct index (temp float)
0:6 direct index (temp 4-component vector of float)
0:6 'm' (temp 3X4 matrix of float)
0:6 Constant:
0:6 2 (const int)
0:6 Constant:
0:6 3 (const int)
0:6 Constant:
0:6 2.000000
0:8 move second child to first child (temp 4-component vector of float)
0:8 direct index (temp 4-component vector of float)
0:8 'm' (temp 3X4 matrix of float)
0:8 Constant:
0:8 0 (const int)
0:8 Constant:
0:8 3.000000
0:8 3.000000
0:8 3.000000
0:8 3.000000
0:9 move second child to first child (temp 4-component vector of float)
0:9 direct index (temp 4-component vector of float)
0:9 'm' (temp 3X4 matrix of float)
0:9 Constant:
0:9 1 (const int)
0:9 Constant:
0:9 3.000000
0:9 3.000000
0:9 3.000000
0:9 3.000000
0:? Linker Objects
0:? 'inf' (layout(location=0 ) in float)
// Module Version 10000
// Generated by (magic number): 80001
// Id's are bound by 29
Capability Shader
1: ExtInstImport "GLSL.std.450"
MemoryModel Logical GLSL450
EntryPoint Vertex 4 "ShaderFunction" 28
Name 4 "ShaderFunction"
Name 10 "m"
Name 28 "inf"
Decorate 28(inf) Location 0
2: TypeVoid
3: TypeFunction 2
6: TypeFloat 32
7: TypeVector 6(float) 4
8: TypeMatrix 7(fvec4) 3
9: TypePointer Function 8
11: TypeInt 32 1
12: 11(int) Constant 2
13: 6(float) Constant 1065353216
14: TypeInt 32 0
15: 14(int) Constant 3
16: TypePointer Function 6(float)
18: 6(float) Constant 1073741824
20: 11(int) Constant 0
21: 6(float) Constant 1077936128
22: 7(fvec4) ConstantComposite 21 21 21 21
23: TypePointer Function 7(fvec4)
25: 11(int) Constant 1
27: TypePointer Input 6(float)
28(inf): 27(ptr) Variable Input
4(ShaderFunction): 2 Function None 3
5: Label
10(m): 9(ptr) Variable Function
17: 16(ptr) AccessChain 10(m) 12 15
Store 17 13
19: 16(ptr) AccessChain 10(m) 12 15
Store 19 18
24: 23(ptr) AccessChain 10(m) 20
Store 24 22
26: 23(ptr) AccessChain 10(m) 25
Store 26 22
Return
FunctionEnd

10
Test/hlsl.matrixSwizzle.vert Normal file
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@ -0,0 +1,10 @@
void ShaderFunction(float inf) : COLOR0
{
float3x4 m;
m._34 = 1.0; // AST should have a normal component select
m._m23 = 2.0; // same code
m._11_12_13_14 = float4(3.0); // AST should have normal column selection (first row)
m._m10_m11_m12_m13 = float4(3.0); // AST should have normal column selection (second row)
}

26
glslang/MachineIndependent/localintermediate.h
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@ -62,6 +62,32 @@ struct TVectorFields {
int num;
};
class TMatrixComponents {
public:
static const int maxMatrixComponents = 4;
struct tMatrixComponent {
int coord1; // stay agnostic about column/row; this is parse order
int coord2;
};
TMatrixComponents() : size_(0) { }
void push_back(tMatrixComponent comp)
{
if (size_ < maxMatrixComponents)
components[size_++] = comp;
}
int size() const { return size_; }
tMatrixComponent get(int i) const
{
assert(i < maxMatrixComponents);
return components[i];
}
private:
int size_;
tMatrixComponent components[4];
};
//
// Some helper structures for TIntermediate. Their contents are encapsulated
// by TIntermediate.

1
gtests/Hlsl.FromFile.cpp
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@ -154,6 +154,7 @@ INSTANTIATE_TEST_CASE_P(
{"hlsl.logical.binary.frag", "main"},
{"hlsl.logical.binary.vec.frag", "main"},
{"hlsl.matNx1.frag", "main"},
{"hlsl.matrixSwizzle.vert", "ShaderFunction"},
{"hlsl.mintypes.frag", "main"},
{"hlsl.multiEntry.vert", "RealEntrypoint"},
{"hlsl.multiReturn.frag", "main"},

118
hlsl/hlslParseHelper.cpp
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@ -595,6 +595,90 @@ bool HlslParseContext::parseVectorFields(const TSourceLoc& loc, const TString& c
return true;
}
//
// Look at a '.' field selector string and change it into components
// for a matrix. There are two types:
//
// _21 second row, first column (one based)
// _m21 third row, second column (zero based)
//
// Returns true if there is no error.
//
bool HlslParseContext::parseMatrixComponents(const TSourceLoc& loc, const TString& fields, int cols, int rows,
TMatrixComponents& components)
{
int startPos[TMatrixComponents::maxMatrixComponents];
int numComps = 0;
TString compString = fields;
// Find where each component starts,
// recording the first character position after the '_'.
for (size_t c = 0; c < compString.size(); ++c) {
if (compString[c] == '_') {
if (numComps >= TMatrixComponents::maxMatrixComponents) {
error(loc, "matrix component swizzle has too many components", compString.c_str(), "");
return false;
}
if (c > compString.size() - 3 ||
((compString[c+1] == 'm' || compString[c+1] == 'M') && c > compString.size() - 4)) {
error(loc, "matrix component swizzle missing", compString.c_str(), "");
return false;
}
startPos[numComps++] = c + 1;
}
}
// Process each component
for (int i = 0; i < numComps; ++i) {
int pos = startPos[i];
int bias = -1;
if (compString[pos] == 'm' || compString[pos] == 'M') {
bias = 0;
++pos;
}
TMatrixComponents::tMatrixComponent comp;
comp.coord1 = compString[pos+0] - '0' + bias;
comp.coord2 = compString[pos+1] - '0' + bias;
if (comp.coord1 < 0 || comp.coord1 >= cols) {
error(loc, "matrix row component out of range", compString.c_str(), "");
return false;
}
if (comp.coord2 < 0 || comp.coord2 >= rows) {
error(loc, "matrix column component out of range", compString.c_str(), "");
return false;
}
components.push_back(comp);
}
return true;
}
// If the 'comps' express a column of a matrix,
// return the column. Column means the first coords all match.
//
// Otherwise, return -1.
//
int HlslParseContext::getMatrixComponentsColumn(int rows, const TMatrixComponents& comps)
{
int col = -1;
// right number of comps?
if (comps.size() != rows)
return -1;
// all comps in the same column?
// rows in order?
col = comps.get(0).coord1;
for (int i = 0; i < rows; ++i) {
if (col != comps.get(i).coord1)
return -1;
if (i != comps.get(i).coord2)
return -1;
}
return col;
}
//
// Handle seeing a variable identifier in the grammar.
//
@ -888,6 +972,40 @@ TIntermTyped* HlslParseContext::handleDotDereference(const TSourceLoc& loc, TInt
result->setType(TType(base->getBasicType(), EvqTemporary, base->getType().getQualifier().precision, (int)vectorString.size()));
}
}
} else if (base->isMatrix()) {
TMatrixComponents comps;
if (! parseMatrixComponents(loc, field, base->getMatrixCols(), base->getMatrixRows(), comps))
return result;
if (comps.size() == 1) {
// Representable by m[c][r]
if (base->getType().getQualifier().storage == EvqConst) {
result = intermediate.foldDereference(base, comps.get(0).coord1, loc);
result = intermediate.foldDereference(result, comps.get(1).coord2, loc);
} else {
result = intermediate.addIndex(EOpIndexDirect, base, intermediate.addConstantUnion(comps.get(0).coord1, loc), loc);
TType dereferencedCol(base->getType(), 0);
result->setType(dereferencedCol);
result = intermediate.addIndex(EOpIndexDirect, result, intermediate.addConstantUnion(comps.get(0).coord2, loc), loc);
TType dereferenced(dereferencedCol, 0);
result->setType(dereferenced);
}
} else {
int column = getMatrixComponentsColumn(base->getMatrixRows(), comps);
if (column >= 0) {
// Representable by m[c]
if (base->getType().getQualifier().storage == EvqConst)
result = intermediate.foldDereference(base, column, loc);
else {
result = intermediate.addIndex(EOpIndexDirect, base, intermediate.addConstantUnion(column, loc), loc);
TType dereferenced(base->getType(), 0);
result->setType(dereferenced);
}
} else {
// general case, not a column, not a single component
error(loc, "arbitrary matrix component selection not supported", field.c_str(), "");
}
}
} else if (base->getBasicType() == EbtStruct || base->getBasicType() == EbtBlock) {
const TTypeList* fields = base->getType().getStruct();
bool fieldFound = false;

2
hlsl/hlslParseHelper.h
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@ -97,6 +97,8 @@ public:
TIntermAggregate* handleSamplerTextureCombine(const TSourceLoc& loc, TIntermTyped* argTex, TIntermTyped* argSampler);
bool parseVectorFields(const TSourceLoc&, const TString&, int vecSize, TVectorFields&);
bool parseMatrixComponents(const TSourceLoc&, const TString&, int cols, int rows, TMatrixComponents&);
int getMatrixComponentsColumn(int rows, const TMatrixComponents&);
void assignError(const TSourceLoc&, const char* op, TString left, TString right);
void unaryOpError(const TSourceLoc&, const char* op, TString operand);
void binaryOpError(const TSourceLoc&, const char* op, TString left, TString right);