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Merge pull request #756 from steve-lunarg/getdimensions-fix

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HLSL: use LOD form of ImageQuerySize when needed.
This commit is contained in:
John Kessenich
2017-03-07 20:57:49 -07:00
committed by GitHub
parent ca71d946d7 3ce4536ac8
commit b7201f8ee6
5 changed files with 1004 additions and 892 deletions
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26
hlsl/hlslParseHelper.cpp
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@@ -2703,6 +2703,7 @@ void HlslParseContext::decomposeSampleMethods(const TSourceLoc& loc, TIntermType
const TSampler& sampler = texType.getSampler();
const TSamplerDim dim = sampler.dim;
const bool isImage = sampler.isImage();
const bool isMs = sampler.isMultiSample();
const int numArgs = (int)argAggregate->getSequence().size();
int numDims = 0;
@@ -2713,6 +2714,7 @@ void HlslParseContext::decomposeSampleMethods(const TSourceLoc& loc, TIntermType
case Esd3D: numDims = 3; break; // W, H, D
case EsdCube: numDims = 2; break; // W, H (cube)
case EsdBuffer: numDims = 1; break; // W (buffers)
case EsdRect: numDims = 2; break; // W, H (rect)
default:
assert(0 && "unhandled texture dimension");
}
@@ -2721,17 +2723,31 @@ void HlslParseContext::decomposeSampleMethods(const TSourceLoc& loc, TIntermType
if (sampler.isArrayed())
++numDims;
// Establish whether we're querying mip levels
const bool mipQuery = (numArgs > (numDims + 1)) && (!sampler.isMultiSample());
// Establish whether the method itself is querying mip levels. This can be false even
// if the underlying query requires a MIP level, due to the available HLSL method overloads.
const bool mipQuery = (numArgs > (numDims + 1 + (isMs ? 1 : 0)));
// Establish whether we must use the LOD form of query (even if the method did not supply a mip level to query).
// True if:
// 1. 1D/2D/3D/Cube AND multisample==0 AND NOT image (those can be sent to the non-LOD query)
// or,
// 2. There is a LOD (because the non-LOD query cannot be used in that case, per spec)
const bool mipRequired =
((dim == Esd1D || dim == Esd2D || dim == Esd3D || dim == EsdCube) && !isMs && !isImage) || // 1...
mipQuery; // 2...
// AST assumes integer return. Will be converted to float if required.
TIntermAggregate* sizeQuery = new TIntermAggregate(isImage ? EOpImageQuerySize : EOpTextureQuerySize);
sizeQuery->getSequence().push_back(argTex);
// If we're querying an explicit LOD, add the LOD, which is always arg #1
if (mipQuery) {
TIntermTyped* queryLod = argAggregate->getSequence()[1]->getAsTyped();
// If we're building an LOD query, add the LOD.
if (mipRequired) {
// If the base HLSL query had no MIP level given, use level 0.
TIntermTyped* queryLod = mipQuery ? argAggregate->getSequence()[1]->getAsTyped() :
intermediate.addConstantUnion(0, loc, true);
sizeQuery->getSequence().push_back(queryLod);
}
sizeQuery->setType(TType(EbtUint, EvqTemporary, numDims));
sizeQuery->setLoc(loc);