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

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• Hash : ac44cd2b
  Author :
  Date : 2013-09-23T14:57:09
  

  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
  

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• 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_
  

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