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//
// Copyright (c) 2016 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
#include "compiler/translator/RemoveInvariantDeclaration.h"
#include "compiler/translator/IntermTraverse.h"
namespace sh
{
namespace
{
// An AST traverser that removes invariant declaration for input in fragment shader
// when GLSL >= 4.20 and for output in vertex shader when GLSL < 4.2.
class RemoveInvariantDeclarationTraverser : public TIntermTraverser
{
public:
RemoveInvariantDeclarationTraverser() : TIntermTraverser(true, false, false) {}
private:
bool visitInvariantDeclaration(Visit visit, TIntermInvariantDeclaration *node) override
{
TIntermSequence emptyReplacement;
mMultiReplacements.push_back(
NodeReplaceWithMultipleEntry(getParentNode()->getAsBlock(), node, emptyReplacement));
return false;
}
};
} // anonymous namespace
void RemoveInvariantDeclaration(TIntermNode *root)
{
RemoveInvariantDeclarationTraverser traverser;
root->traverse(&traverser);
traverser.updateTree();
}
} // namespace sh
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