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Add texture gather functions (and extension check) for GLSL 400 and GL_ARB_texture_gather.

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git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@23631 e7fa87d3-cd2b-0410-9028-fcbf551c1848
This commit is contained in:
John Kessenich 2013-10-21 19:25:59 +00:00
parent a65dc63d46
commit 21a8770f92
11 changed files with 301 additions and 36 deletions
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36
glslang/MachineIndependent/ParseHelper.cpp
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@ -867,10 +867,8 @@ TIntermTyped* TParseContext::handleFunctionCall(TSourceLoc loc, TFunction* fnCal
qualifierList.push_back(qual);
}
// built-in texturing functions get their return value precision from the precision of the sampler
if (builtIn && fnCandidate->getType().getQualifier().precision == EpqNone &&
fnCandidate->getParamCount() > 0 && (*fnCandidate)[0].type->getBasicType() == EbtSampler)
result->getQualifier().precision = result->getAsAggregate()->getSequence()[0]->getAsTyped()->getQualifier().precision;
if (builtIn)
nonOpBuiltInCheck(loc, *fnCandidate, result->getAsAggregate());
}
} else {
// error message was put out by PaFindFunction()
@ -892,6 +890,36 @@ TIntermTyped* TParseContext::handleFunctionCall(TSourceLoc loc, TFunction* fnCal
return result;
}
//
// Do additional checking of built-in function calls that were not mapped
// to built-in operations (e.g., texturing functions).
//
// Assumes there has been a semantically correct match to a built-in function.
//
void TParseContext::nonOpBuiltInCheck(TSourceLoc loc, const TFunction& fnCandidate, TIntermAggregate* callNode)
{
// built-in texturing functions get their return value precision from the precision of the sampler
if (fnCandidate.getType().getQualifier().precision == EpqNone &&
fnCandidate.getParamCount() > 0 && fnCandidate[0].type->getBasicType() == EbtSampler)
callNode->getQualifier().precision = callNode->getAsAggregate()->getSequence()[0]->getAsTyped()->getQualifier().precision;
if (fnCandidate.getName().compare(0, 13, "textureGather") == 0) {
const char* feature = "texture gather function";
requireProfile(loc, ~EEsProfile, feature);
profileRequires(loc, ~EEsProfile, 400, GL_ARB_texture_gather, feature);
int lastArgIndex = fnCandidate.getParamCount() - 1;
if (fnCandidate[lastArgIndex].type->getBasicType() == EbtInt && fnCandidate[lastArgIndex].type->isScalar()) {
// the last integral argument to a texture gather must be a constant int between 0 and 3
if (callNode->getSequence()[lastArgIndex]->getAsConstantUnion()) {
int value = callNode->getSequence()[lastArgIndex]->getAsConstantUnion()->getConstArray()[0].getIConst();
if (value < 0 || value > 3)
error(loc, "must be 0, 1, 2, or 3", "texture gather component", "");
} else
error(loc, "must be a constant", "texture gather component", "");
}
}
}
//
// Handle seeing a built-in-type constructor call in the grammar.
//