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//
// Copyright 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/tree_ops/RemoveInvariantDeclaration.h"
#include "compiler/translator/tree_util/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 visitGlobalQualifierDeclaration(Visit visit,
TIntermGlobalQualifierDeclaration *node) override
{
if (node->isInvariant())
{
TIntermSequence emptyReplacement;
mMultiReplacements.emplace_back(getParentNode()->getAsBlock(), node,
std::move(emptyReplacement));
}
return false;
}
};
} // anonymous namespace
bool RemoveInvariantDeclaration(TCompiler *compiler, TIntermNode *root)
{
RemoveInvariantDeclarationTraverser traverser;
root->traverse(&traverser);
return traverser.updateTree(compiler, root);
}
} // namespace sh
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