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

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• Hash : 68981eb5
  Author :
  Date : 2018-01-23T17:46:12
  

  Track parameter qualifiers of functions in call nodes
  
  We now add a reference to TFunction to all TIntermAggregate nodes
  where it is possible, including built-in ops. We also make sure
  that internal TFunctions added in traversers have correct parameter
  qualifiers.
  
  This makes TLValueTrackingTraverser much simpler. Instead of storing
  traversed functions or looking up builtin functions from the symbol
  table, determining which function parameters are out parameters can
  now be done simply by looking it up from the function symbol
  associated with the aggregate node.
  
  Symbol instances are no longer deleted when a symbol table level goes
  out of scope, and TFunction destructor no longer clears the
  parameters. They're all either statically allocated or pool allocated,
  so this does not result in leaks.
  
  TEST=angle_unittests
  BUG=angleproject:2267
  
  Change-Id: I57e5570da5b5a69a98a8778da3c2dc82b6284738
  Reviewed-on: https://chromium-review.googlesource.com/881324
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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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 "GLSLANG/ShaderLang.h"
  #include "common/angleutils.h"
  #include "compiler/translator/Compiler.h"
  #include "compiler/translator/InfoSink.h"
  #include "compiler/translator/IntermTraverse.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.
  
  namespace sh
  {
  
  class EmulatePrecision : public TLValueTrackingTraverser
  {
    public:
      EmulatePrecision(TSymbolTable *symbolTable);
  
      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;
      bool visitInvariantDeclaration(Visit visit, TIntermInvariantDeclaration *node) override;
      bool visitDeclaration(Visit visit, TIntermDeclaration *node) override;
      bool visitFunctionPrototype(Visit visit, TIntermFunctionPrototype *node) override;
  
      void writeEmulationHelpers(TInfoSinkBase &sink,
                                 const int shaderVersion,
                                 const ShShaderOutput outputLanguage);
  
      static bool SupportedInLanguage(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;
          }
      };
  
      const TFunction *getInternalFunction(TString *functionName,
                                           const TType &returnType,
                                           TIntermSequence *arguments,
                                           const TVector<TConstParameter> &parameters,
                                           bool knownToNotHaveSideEffects);
      TIntermAggregate *createRoundingFunctionCallNode(TIntermTyped *roundedChild);
      TIntermAggregate *createCompoundAssignmentFunctionCallNode(TIntermTyped *left,
                                                                 TIntermTyped *right,
                                                                 const char *opNameStr);
  
      typedef std::set<TypePair, TypePairComparator> EmulationSet;
      EmulationSet mEmulateCompoundAdd;
      EmulationSet mEmulateCompoundSub;
      EmulationSet mEmulateCompoundMul;
      EmulationSet mEmulateCompoundDiv;
  
      // Map from mangled name to function.
      TMap<TString, const TFunction *> mInternalFunctions;
  
      bool mDeclaringVariables;
  
      const TString *mParamXName;
      const TString *mParamYName;
  };
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_EMULATE_PRECISION_H_
  

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