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Simplify and rationalize constant folding for dereferences (array, matrix, vector, swizzle, struct).

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git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24259 e7fa87d3-cd2b-0410-9028-fcbf551c1848
This commit is contained in:
John Kessenich 2013-12-01 23:37:08 +00:00
parent 1fbaa35ce7
commit 3591813a8b
8 changed files with 95 additions and 180 deletions
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52
glslang/MachineIndependent/Constant.cpp
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@ -753,4 +753,56 @@ TIntermTyped* TIntermediate::foldConstructor(TIntermAggregate* aggrNode)
return addConstantUnion(unionArray, aggrNode->getType(), aggrNode->getLoc());
}
//
// Constant folding of a bracket (array-style) dereference or struct-like dot
// dereference. Can handle any thing except a multi-character swizzle, though
// all swizzles may go to foldSwizzle().
//
TIntermTyped* TIntermediate::foldDereference(TIntermTyped* node, int index, TSourceLoc loc)
{
TType dereferencedType(node->getType(), index);
dereferencedType.getQualifier().storage = EvqConst;
TIntermTyped* result = 0;
int size = dereferencedType.getObjectSize();
int start;
if (node->isStruct()) {
start = 0;
for (int i = 0; i < index; ++i)
start += (*node->getType().getStruct())[i].type->getObjectSize();
} else
start = size * index;
result = addConstantUnion(TConstUnionArray(node->getAsConstantUnion()->getConstArray(), start, size), node->getType(), loc);
if (result == 0)
result = node;
else
result->setType(dereferencedType);
return result;
}
//
// Make a constant vector node or constant scalar node, representing a given
// constant vector and constant swizzle into it.
//
TIntermTyped* TIntermediate::foldSwizzle(TIntermTyped* node, TVectorFields& fields, TSourceLoc loc)
{
const TConstUnionArray& unionArray = node->getAsConstantUnion()->getConstArray();
TConstUnionArray constArray(fields.num);
for (int i = 0; i < fields.num; i++)
constArray[i] = unionArray[fields.offsets[i]];
TIntermTyped* result = addConstantUnion(constArray, node->getType(), loc);
if (result == 0)
result = node;
else
result->setType(TType(node->getBasicType(), EvqConst, fields.num));
return result;
}
} // end namespace glslang