InitializeGLPosition.h

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Author : Zhenyao Mo
Date : 2013-09-23 14:57:09
Hash : ac44cd2b
Message : Add an option in ANGLE shader translator to initialize gl_Position to vec4(0.0, 0.0, 0.0, 1.0). This is to work around driver bugs where shader compile or program link would fail incorrectly if gl_Position is not set in vertex shader. At the moment at least Linux NVIDIA driver has this bug. ANGLEBUG=472 R=alokp@chromium.org, kbr@chromium.org Review URL: https://codereview.appspot.com/13509043

src/compiler/InitializeGLPosition.h

//
// Copyright (c) 2002-2013 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.
//

#ifndef COMPILER_INITIALIZE_GL_POSITION_H_
#define COMPILER_INITIALIZE_GL_POSITION_H_

#include "compiler/intermediate.h"

class InitializeGLPosition : public TIntermTraverser
{
public:
    InitializeGLPosition() : mCodeInserted(false) { }

protected:
    virtual bool visitBinary(Visit visit, TIntermBinary* node) { return false; }
    virtual bool visitUnary(Visit visit, TIntermUnary* node) { return false; }
    virtual bool visitSelection(Visit visit, TIntermSelection* node) { return false; }
    virtual bool visitLoop(Visit visit, TIntermLoop* node) { return false; }
    virtual bool visitBranch(Visit visit, TIntermBranch* node) { return false; }

    virtual bool visitAggregate(Visit visit, TIntermAggregate* node);

private:
    // Insert AST node in the beginning of main() for "gl_Position = vec4(0.0, 0.0, 0.0, 1.0);".
    void insertCode(TIntermSequence& sequence);

    bool mCodeInserted;
};

#endif  // COMPILER_INITIALIZE_GL_POSITION_H_

kc3-lang/angle/src/compiler/InitializeGLPosition.h

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kc3-lang/angle /src/compiler/InitializeGLPosition.h