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 //

 // 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_