kc3-lang/angle/src/compiler/Compiler.cpp

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• Author : alokp@chromium.org
  Date : 2010-10-01 21:13:12
  Hash : 4888ceb6
  Message : Made the API of shader translator library consistent. - We recently started using OpenGL-type enums. This CL makes all old enums consistent with the new scheme. - Renamed TBuiltInResource to ShBuiltInResources to have a consistent prefix BUG=46 Review URL: http://codereview.appspot.com/2328041 git-svn-id: https://angleproject.googlecode.com/svn/trunk@443 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/Compiler.cpp

• //
  // Copyright (c) 2002-2010 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.
  //
  
  #include "compiler/Initialize.h"
  #include "compiler/ParseHelper.h"
  #include "compiler/ShHandle.h"
  
  static bool InitializeSymbolTable(
          const TBuiltInStrings& builtInStrings,
          ShShaderType type, ShShaderSpec spec, const ShBuiltInResources& resources,
          TInfoSink& infoSink, TSymbolTable& symbolTable)
  {
      TIntermediate intermediate(infoSink);
      TExtensionBehavior extBehavior;
      TParseContext parseContext(symbolTable, extBehavior, intermediate, type, spec, infoSink);
  
      GlobalParseContext = &parseContext;
  
      setInitialState();
  
      assert(symbolTable.isEmpty());       
      //
      // Parse the built-ins.  This should only happen once per
      // language symbol table.
      //
      // Push the symbol table to give it an initial scope.  This
      // push should not have a corresponding pop, so that built-ins
      // are preserved, and the test for an empty table fails.
      //
      symbolTable.push();
      
      //Initialize the Preprocessor
      if (InitPreprocessor())
      {
          infoSink.info.message(EPrefixInternalError,  "Unable to intialize the Preprocessor");
          return false;
      }
  
      for (TBuiltInStrings::const_iterator i = builtInStrings.begin(); i != builtInStrings.end(); ++i)
      {
          const char* builtInShaders = i->c_str();
          int builtInLengths = static_cast<int>(i->size());
          if (builtInLengths <= 0)
            continue;
  
          if (PaParseStrings(&builtInShaders, &builtInLengths, 1, parseContext) != 0)
          {
              infoSink.info.message(EPrefixInternalError, "Unable to parse built-ins");
              return false;
          }
      }
  
      IdentifyBuiltIns(type, spec, resources, symbolTable);
  
      FinalizePreprocessor();
  
      return true;
  }
  
  static void DefineExtensionMacros(const TExtensionBehavior& extBehavior)
  {
      for (TExtensionBehavior::const_iterator iter = extBehavior.begin();
           iter != extBehavior.end(); ++iter) {
          PredefineIntMacro(iter->first.c_str(), 1);
      }
  }
  
  TCompiler::TCompiler(ShShaderType type, ShShaderSpec spec)
      : shaderType(type),
        shaderSpec(spec) 
  {
  }
  
  TCompiler::~TCompiler()
  {
  }
  
  bool TCompiler::Init(const ShBuiltInResources& resources)
  {
      // Generate built-in symbol table.
      if (!InitBuiltInSymbolTable(resources))
          return false;
  
      InitExtensionBehavior(resources, extensionBehavior);
      return true;
  }
  
  bool TCompiler::compile(const char* const shaderStrings[],
                          const int numStrings,
                          int compileOptions)
  {
      clearResults();
  
      if (numStrings == 0)
          return true;
  
      TIntermediate intermediate(infoSink);
      TParseContext parseContext(symbolTable, extensionBehavior, intermediate,
                                 shaderType, shaderSpec, infoSink);
      GlobalParseContext = &parseContext;
      setInitialState();
  
      // Initialize preprocessor.
      InitPreprocessor();
      DefineExtensionMacros(extensionBehavior);
  
      // We preserve symbols at the built-in level from compile-to-compile.
      // Start pushing the user-defined symbols at global level.
      symbolTable.push();
      if (!symbolTable.atGlobalLevel())
          infoSink.info.message(EPrefixInternalError, "Wrong symbol table level");
  
      // Parse shader.
      bool success =
          (PaParseStrings(shaderStrings, 0, numStrings, parseContext) == 0) &&
          (parseContext.treeRoot != NULL);
      if (success) {
          success = intermediate.postProcess(parseContext.treeRoot);
  
          if (success && (compileOptions & SH_INTERMEDIATE_TREE))
              intermediate.outputTree(parseContext.treeRoot);
  
          if (success && (compileOptions & SH_OBJECT_CODE))
              translate(parseContext.treeRoot);
  
          if (success && (compileOptions & SH_ATTRIBUTES_UNIFORMS))
              collectAttribsUniforms(parseContext.treeRoot);
      }
  
      // Cleanup memory.
      intermediate.remove(parseContext.treeRoot);
      // Ensure symbol table is returned to the built-in level,
      // throwing away all but the built-ins.
      while (!symbolTable.atBuiltInLevel())
          symbolTable.pop();
      FinalizePreprocessor();
  
      return success;
  }
  
  bool TCompiler::InitBuiltInSymbolTable(const ShBuiltInResources& resources)
  {
      TBuiltIns builtIns;
  
      builtIns.initialize(shaderType, shaderSpec, resources);
      return InitializeSymbolTable(builtIns.getBuiltInStrings(),
          shaderType, shaderSpec, resources, infoSink, symbolTable);
  }
  
  void TCompiler::clearResults()
  {
      infoSink.info.erase();
      infoSink.obj.erase();
      infoSink.debug.erase();
  
      attribs.clear();
      uniforms.clear();
  }
  
  void TCompiler::collectAttribsUniforms(TIntermNode* root)
  {
      CollectAttribsUniforms collect(attribs, uniforms);
      root->traverse(&collect);
  }