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

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• Hash : 32e97315
  Author :
  Date : 2011-08-24T01:03:11
  

  Emulate certain buil-in functions to work around driver bugs.
  
  This is implemented by adding a new compile option SH_EMULATE_BUILT_IN_FUNCTIONS.  The emulated functions are names as webgl_originalName_emu so there will never be naming conflicts.
  
  At the moment only three functions are emulated: normalize, abs, sign.  Also, the compile option will emulate all three.  However, the mechanism to emulate only a selected subset is also imeplemented.  It can be turned on easily.
  
  ANGLEBUG=196
  TEST=with this option, the failed test with abs.frag passes.
  Review URL: http://codereview.appspot.com/4916043
  
  git-svn-id: https://angleproject.googlecode.com/svn/trunk@738 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• src/compiler/TranslatorESSL.cpp

• //
  // Copyright (c) 2002-2011 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/TranslatorESSL.h"
  
  #include "compiler/OutputESSL.h"
  
  TranslatorESSL::TranslatorESSL(ShShaderType type, ShShaderSpec spec)
      : TCompiler(type, spec) {
  }
  
  void TranslatorESSL::translate(TIntermNode* root) {
      TInfoSinkBase& sink = getInfoSink().obj;
  
      // Write built-in extension behaviors.
      writeExtensionBehavior();
  
      // Write emulated built-in functions if needed.
      getBuiltInFunctionEmulator().OutputEmulatedFunctionDefinition(
          sink, getShaderType() == SH_FRAGMENT_SHADER);
  
      // Write translated shader.
      TOutputESSL outputESSL(sink);
      root->traverse(&outputESSL);
  }
  
  void TranslatorESSL::writeExtensionBehavior() {
      TInfoSinkBase& sink = getInfoSink().obj;
      const TExtensionBehavior& extensionBehavior = getExtensionBehavior();
      for (TExtensionBehavior::const_iterator iter = extensionBehavior.begin();
           iter != extensionBehavior.end(); ++iter) {
          if (iter->second != EBhUndefined) {
              sink << "#extension " << iter->first << " : "
                   << getBehaviorString(iter->second) << "\n";
          }
      }
  }
  

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