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

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• Hash : e91615cb
  Author :
  Date : 2013-01-25T21:56:03
  

  Treat return statements in loops as loop discontinuities.
  
  This is so that texture2D is converted to texture2DLod in loops with return statements. HLSL does not seem to allow gradient operations in loops with return statements. It considers them to be breaks.
  Review URL: https://codereview.appspot.com/7131057
  
  git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1788 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• src/compiler/DetectDiscontinuity.h

• //
  // Copyright (c) 2012 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.
  //
  // Contains analysis utilities for dealing with HLSL's lack of support for
  // the use of intrinsic functions which (implicitly or explicitly) compute
  // gradients of functions with discontinuities. 
  //
  
  #ifndef COMPILER_DETECTDISCONTINUITY_H_
  #define COMPILER_DETECTDISCONTINUITY_H_
  
  #include "compiler/intermediate.h"
  
  namespace sh
  {
  // Checks whether a loop can run for a variable number of iterations
  class DetectLoopDiscontinuity : public TIntermTraverser
  {
    public:
      bool traverse(TIntermNode *node);
  
    protected:
      bool visitBranch(Visit visit, TIntermBranch *node);
      bool visitLoop(Visit visit, TIntermLoop *loop);
      bool visitAggregate(Visit visit, TIntermAggregate *node);
  
      int mLoopDepth;
      bool mLoopDiscontinuity;
  };
  
  bool containsLoopDiscontinuity(TIntermNode *node);
  
  // Checks for intrinsic functions which compute gradients
  class DetectGradientOperation : public TIntermTraverser
  {
    public:
      bool traverse(TIntermNode *node);
  
    protected:
      bool visitUnary(Visit visit, TIntermUnary *node);
      bool visitAggregate(Visit visit, TIntermAggregate *node);
  
      bool mGradientOperation;
  };
  
  bool containsGradientOperation(TIntermNode *node);
  
  }
  
  #endif   // COMPILER_DETECTDISCONTINUITY_H_
  

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