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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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242
hlsl/hlslParseHelper.cpp
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@@ -521,78 +521,162 @@ bool HlslParseContext::parseVectorFields(const TSourceLoc& loc, const TString& c
estpq,
} fieldSet[4];
for (int i = 0; i < fields.num; ++i) {
switch (compString[i]) {
case 'x':
fields.offsets[i] = 0;
fieldSet[i] = exyzw;
break;
case 'r':
fields.offsets[i] = 0;
fieldSet[i] = ergba;
break;
case 's':
fields.offsets[i] = 0;
fieldSet[i] = estpq;
break;
case 'y':
fields.offsets[i] = 1;
fieldSet[i] = exyzw;
break;
case 'g':
fields.offsets[i] = 1;
fieldSet[i] = ergba;
break;
case 't':
fields.offsets[i] = 1;
fieldSet[i] = estpq;
break;
case 'z':
fields.offsets[i] = 2;
fieldSet[i] = exyzw;
break;
case 'b':
fields.offsets[i] = 2;
fieldSet[i] = ergba;
break;
case 'p':
fields.offsets[i] = 2;
fieldSet[i] = estpq;
break;
for (int i = 0; i < fields.num; ++i) {
switch (compString[i]) {
case 'x':
fields.offsets[i] = 0;
fieldSet[i] = exyzw;
break;
case 'r':
fields.offsets[i] = 0;
fieldSet[i] = ergba;
break;
case 's':
fields.offsets[i] = 0;
fieldSet[i] = estpq;
break;
case 'y':
fields.offsets[i] = 1;
fieldSet[i] = exyzw;
break;
case 'g':
fields.offsets[i] = 1;
fieldSet[i] = ergba;
break;
case 't':
fields.offsets[i] = 1;
fieldSet[i] = estpq;
break;
case 'z':
fields.offsets[i] = 2;
fieldSet[i] = exyzw;
break;
case 'b':
fields.offsets[i] = 2;
fieldSet[i] = ergba;
break;
case 'p':
fields.offsets[i] = 2;
fieldSet[i] = estpq;
break;
case 'w':
fields.offsets[i] = 3;
fieldSet[i] = exyzw;
break;
case 'a':
fields.offsets[i] = 3;
fieldSet[i] = ergba;
break;
case 'q':
fields.offsets[i] = 3;
fieldSet[i] = estpq;
break;
default:
error(loc, "illegal vector field selection", compString.c_str(), "");
case 'w':
fields.offsets[i] = 3;
fieldSet[i] = exyzw;
break;
case 'a':
fields.offsets[i] = 3;
fieldSet[i] = ergba;
break;
case 'q':
fields.offsets[i] = 3;
fieldSet[i] = estpq;
break;
default:
error(loc, "illegal vector field selection", compString.c_str(), "");
return false;
}
}
for (int i = 0; i < fields.num; ++i) {
if (fields.offsets[i] >= vecSize) {
error(loc, "vector field selection out of range", compString.c_str(), "");
return false;
}
if (i > 0) {
if (fieldSet[i] != fieldSet[i - 1]) {
error(loc, "illegal - vector component fields not from the same set", compString.c_str(), "");
return false;
}
}
}
for (int i = 0; i < fields.num; ++i) {
if (fields.offsets[i] >= vecSize) {
error(loc, "vector field selection out of range", compString.c_str(), "");
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 (i > 0) {
if (fieldSet[i] != fieldSet[i - 1]) {
error(loc, "illegal - vector component fields not from the same set", 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;
}
}
return true;
// 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;
}
//
@@ -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;