kc3-lang/angle/src/compiler/translator/ASTMetadataHLSL.h

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• Hash : 477b243b
  Author :
  Date : 2015-08-31T10:41:16
  

  Change the FLATTEN heuristic to "ifs with a loop with a gradient"
  
  This heuristic makes more sense than the previous "ifs with a
  discontinuous loop" as the reason we need to flatten is that we need
  gradients to be in branchless code.
  
  Change the UnrollFlatten test accordingly.
  
  Tested with:
   - the WebGL CTS
   - dev.miaumiau.cat/rayTracer "Skull Demo"
   - THe turbulenz engine GPU particle demo
   - Lots of ShaderToy Samples (inc. Volcanic, Metropolis and Hierarchical
     Voronoi)
   - Google Maps Earth mode
   - Lots of Chrome experiments
   - madebyevan.com/webgl-water
  
  BUG=524297
  
  Change-Id: Iaa727036fffcfde3952716a1ef33b6ee0546b69d
  Reviewed-on: https://chromium-review.googlesource.com/296442
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Tested-by: Corentin Wallez <cwallez@chromium.org>
  

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• src/compiler/translator/ASTMetadataHLSL.h

• //
  // Copyright (c) 2002-2015 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.
  //
  
  // Defines analyses of the AST needed for HLSL generation
  
  #ifndef COMPILER_TRANSLATOR_ASTMETADATAHLSL_H_
  #define COMPILER_TRANSLATOR_ASTMETADATAHLSL_H_
  
  #include <set>
  #include <vector>
  
  class CallDAG;
  class TIntermNode;
  class TIntermSelection;
  class TIntermLoop;
  
  struct ASTMetadataHLSL
  {
      ASTMetadataHLSL()
          : mUsesGradient(false),
            mCalledInDiscontinuousLoop(false),
            mHasGradientLoopInCallGraph(false),
            mNeedsLod0(false)
      {
      }
  
      // Here "something uses a gradient" means here that it either contains a
      // gradient operation, or a call to a function that uses a gradient.
      bool hasGradientInCallGraph(TIntermLoop *node);
      bool hasGradientLoop(TIntermSelection *node);
  
      // Does the function use a gradient.
      bool mUsesGradient;
  
      // Even if usesGradient is true, some control flow might not use a gradient
      // so we store the set of all gradient-using control flows.
      std::set<TIntermNode*> mControlFlowsContainingGradient;
  
      // Remember information about the discontinuous loops and which functions
      // are called in such loops.
      bool mCalledInDiscontinuousLoop;
      bool mHasGradientLoopInCallGraph;
      std::set<TIntermLoop*> mDiscontinuousLoops;
      std::set<TIntermSelection *> mIfsContainingGradientLoop;
  
      // Will we need to generate a Lod0 version of the function.
      bool mNeedsLod0;
  };
  
  typedef std::vector<ASTMetadataHLSL> MetadataList;
  
  // Return the AST analysis result, in the order defined by the call DAG
  MetadataList CreateASTMetadataHLSL(TIntermNode *root, const CallDAG &callDag);
  
  #endif // COMPILER_TRANSLATOR_ASTMETADATAHLSL_H_
  

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