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

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• Hash : 61b81acf
  Author :
  Date : 2016-06-28T14:15:20
  

  Support non-square matrices in precision emulation
  
  In case the shader version is greater than ESSL 1.00, the precision
  emulation needs to output rounding functions for non-square matrix
  types.
  
  Writing emulated compound assignment functions for non-square matrices
  already had most of the code in place before this change.
  
  New compound assignment operators like >>= don't need floating point
  precision emulation in ESSL 3.00, since all of them only operate on
  integers.
  
  BUG=angleproject:1434
  TEST=angle_unittests
  
  Change-Id: I4678f511edf4f9f744fe23bb8d7dab4387f07f20
  Reviewed-on: https://chromium-review.googlesource.com/358472
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  

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• src/compiler/translator/EmulatePrecision.h

• //
  // Copyright (c) 2002-2014 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_TRANSLATOR_EMULATE_PRECISION_H_
  #define COMPILER_TRANSLATOR_EMULATE_PRECISION_H_
  
  #include "common/angleutils.h"
  #include "compiler/translator/Compiler.h"
  #include "compiler/translator/InfoSink.h"
  #include "compiler/translator/IntermNode.h"
  #include "GLSLANG/ShaderLang.h"
  
  // This class gathers all compound assignments from the AST and can then write
  // the functions required for their precision emulation. This way there is no
  // need to write a huge number of variations of the emulated compound assignment
  // to every translated shader with emulation enabled.
  
  class EmulatePrecision : public TLValueTrackingTraverser
  {
    public:
      EmulatePrecision(const TSymbolTable &symbolTable, int shaderVersion);
  
      void visitSymbol(TIntermSymbol *node) override;
      bool visitBinary(Visit visit, TIntermBinary *node) override;
      bool visitUnary(Visit visit, TIntermUnary *node) override;
      bool visitAggregate(Visit visit, TIntermAggregate *node) override;
  
      void writeEmulationHelpers(TInfoSinkBase &sink,
                                 const int shaderVersion,
                                 const ShShaderOutput outputLanguage);
  
    private:
      struct TypePair
      {
          TypePair(const char *l, const char *r)
              : lType(l), rType(r) { }
  
          const char *lType;
          const char *rType;
      };
  
      struct TypePairComparator
      {
          bool operator() (const TypePair& l, const TypePair& r) const
          {
              if (l.lType == r.lType)
                  return l.rType < r.rType;
              return l.lType < r.lType;
          }
      };
  
      typedef std::set<TypePair, TypePairComparator> EmulationSet;
      EmulationSet mEmulateCompoundAdd;
      EmulationSet mEmulateCompoundSub;
      EmulationSet mEmulateCompoundMul;
      EmulationSet mEmulateCompoundDiv;
  
      bool mDeclaringVariables;
  };
  
  #endif  // COMPILER_TRANSLATOR_EMULATE_PRECISION_H_
  

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