RemoveInvariantDeclaration.cpp

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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