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

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• Author : zmo@google.com
  Date : 2012-01-20 00:35:15
  Hash : b9f64aae
  Message : Use a global ref-counted singleton for long name map. This makes sure the same varying/uniform variables maps to the unique name in vertex/fragment shader. BUG= TEST=webgl conformance tests Review URL: https://codereview.appspot.com/5556065 git-svn-id: https://angleproject.googlecode.com/svn/trunk@950 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/MapLongVariableNames.h

• //
  // Copyright (c) 2002-2012 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.
  //
  
  #ifndef COMPILER_MAP_LONG_VARIABLE_NAMES_H_
  #define COMPILER_MAP_LONG_VARIABLE_NAMES_H_
  
  #include "GLSLANG/ShaderLang.h"
  
  #include "compiler/intermediate.h"
  #include "compiler/VariableInfo.h"
  
  // This size does not include '\0' in the end.
  #define MAX_SHORTENED_IDENTIFIER_SIZE 32
  
  // This is a ref-counted singleton. GetInstance() returns a pointer to the
  // singleton, and after use, call Release(). GetInstance() and Release() should
  // be paired.
  class LongNameMap {
  public:
      static LongNameMap* GetInstance();
      void Release();
  
      // Return the mapped name if <originalName, mappedName> is in the map;
      // otherwise, return NULL.
      const char* Find(const char* originalName) const;
  
      // Insert a pair into the map.
      void Insert(const char* originalName, const char* mappedName);
  
      // Return the number of entries in the map.
      int Size() const;
  
  private:
      LongNameMap();
      ~LongNameMap();
  
      size_t refCount;
      std::map<std::string, std::string> mLongNameMap;
  };
  
  // Traverses intermediate tree to map attributes and uniforms names that are
  // longer than MAX_SHORTENED_IDENTIFIER_SIZE to MAX_SHORTENED_IDENTIFIER_SIZE.
  class MapLongVariableNames : public TIntermTraverser {
  public:
      MapLongVariableNames(LongNameMap* globalMap);
  
      virtual void visitSymbol(TIntermSymbol*);
      virtual bool visitLoop(Visit, TIntermLoop*);
  
  private:
      TString mapGlobalLongName(const TString& name);
  
      LongNameMap* mGlobalMap;
  };
  
  #endif  // COMPILER_MAP_LONG_VARIABLE_NAMES_H_