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//
// Copyright (C) 2002-2005 3Dlabs Inc. Ltd.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
//
// Neither the name of 3Dlabs Inc. Ltd. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
//
// Traverse a tree of constants to create a single folded constant.
// It should only be used when the whole tree is known to be constant.
//
#include "ParseHelper.h"
namespace glslang {
class TConstTraverser : public TIntermTraverser {
public:
TConstTraverser(const TConstUnionArray& cUnion, bool singleConstParam, TOperator constructType, const TType& t)
: unionArray(cUnion), type(t),
constructorType(constructType), singleConstantParam(singleConstParam), error(false), isMatrix(false),
matrixCols(0), matrixRows(0) { index = 0; tOp = EOpNull; }
virtual void visitConstantUnion(TIntermConstantUnion* node);
virtual bool visitAggregate(TVisit, TIntermAggregate* node);
int index;
TConstUnionArray unionArray;
TOperator tOp;
const TType& type;
TOperator constructorType;
bool singleConstantParam;
bool error;
int size; // size of the constructor ( 4 for vec4)
bool isMatrix;
int matrixCols;
int matrixRows;
protected:
TConstTraverser(TConstTraverser&);
TConstTraverser& operator=(TConstTraverser&);
};
bool TConstTraverser::visitAggregate(TVisit /* visit */, TIntermAggregate* node)
{
if (! node->isConstructor() && node->getOp() != EOpComma) {
error = true;
return false;
}
bool flag = node->getSequence().size() == 1 && node->getSequence()[0]->getAsTyped()->getAsConstantUnion();
if (flag) {
singleConstantParam = true;
constructorType = node->getOp();
size = node->getType().computeNumComponents();
if (node->getType().isMatrix()) {
isMatrix = true;
matrixCols = node->getType().getMatrixCols();
matrixRows = node->getType().getMatrixRows();
}
}
for (TIntermSequence::iterator p = node->getSequence().begin();
p != node->getSequence().end(); p++) {
if (node->getOp() == EOpComma)
index = 0;
(*p)->traverse(this);
}
if (flag)
{
singleConstantParam = false;
constructorType = EOpNull;
size = 0;
isMatrix = false;
matrixCols = 0;
matrixRows = 0;
}
return false;
}
void TConstTraverser::visitConstantUnion(TIntermConstantUnion* node)
{
TConstUnionArray leftUnionArray(unionArray);
int instanceSize = type.computeNumComponents();
if (index >= instanceSize)
return;
if (! singleConstantParam) {
int rightUnionSize = node->getType().computeNumComponents();
const TConstUnionArray& rightUnionArray = node->getConstArray();
for (int i = 0; i < rightUnionSize; i++) {
if (index >= instanceSize)
return;
leftUnionArray[index] = rightUnionArray[i];
index++;
}
} else {
int endIndex = index + size;
const TConstUnionArray& rightUnionArray = node->getConstArray();
if (! isMatrix) {
int count = 0;
int nodeComps = node->getType().computeNumComponents();
for (int i = index; i < endIndex; i++) {
if (i >= instanceSize)
return;
leftUnionArray[i] = rightUnionArray[count];
(index)++;
if (nodeComps > 1)
count++;
}
} else {
// constructing a matrix, but from what?
if (node->isMatrix()) {
// Matrix from a matrix; this has the outer matrix, node is the argument matrix.
// Traverse the outer, potentially bigger matrix, fill in missing pieces with the
// identity matrix.
for (int c = 0; c < matrixCols; ++c) {
for (int r = 0; r < matrixRows; ++r) {
int targetOffset = index + c * matrixRows + r;
if (r < node->getType().getMatrixRows() && c < node->getType().getMatrixCols()) {
int srcOffset = c * node->getType().getMatrixRows() + r;
leftUnionArray[targetOffset] = rightUnionArray[srcOffset];
} else if (r == c)
leftUnionArray[targetOffset].setDConst(1.0);
else
leftUnionArray[targetOffset].setDConst(0.0);
}
}
} else {
// matrix from vector
int count = 0;
const int startIndex = index;
int nodeComps = node->getType().computeNumComponents();
for (int i = startIndex; i < endIndex; i++) {
if (i >= instanceSize)
return;
if (i == startIndex || (i - startIndex) % (matrixRows + 1) == 0 )
leftUnionArray[i] = rightUnionArray[count];
else
leftUnionArray[i].setDConst(0.0);
index++;
if (nodeComps > 1)
count++;
}
}
}
}
}
bool TIntermediate::parseConstTree(TIntermNode* root, TConstUnionArray unionArray, TOperator constructorType, const TType& t, bool singleConstantParam)
{
if (root == 0)
return false;
TConstTraverser it(unionArray, singleConstantParam, constructorType, t);
root->traverse(&it);
if (it.error)
return true;
else
return false;
}
} // end namespace glslang
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