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

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• Author : zmo@google.com
  Date : 2011-08-24 01:03:11
  Hash : 32e97315
  Message : 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

• src/compiler/TranslatorGLSL.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/TranslatorGLSL.h"
  
  #include "compiler/OutputGLSL.h"
  #include "compiler/VersionGLSL.h"
  
  static void writeVersion(ShShaderType type, TIntermNode* root,
                           TInfoSinkBase& sink) {
      TVersionGLSL versionGLSL(type);
      root->traverse(&versionGLSL);
      int version = versionGLSL.getVersion();
      // We need to write version directive only if it is greater than 110.
      // If there is no version directive in the shader, 110 is implied.
      if (version > 110) {
          sink << "#version " << version << "\n";
      }
  }
  
  TranslatorGLSL::TranslatorGLSL(ShShaderType type, ShShaderSpec spec)
      : TCompiler(type, spec) {
  }
  
  void TranslatorGLSL::translate(TIntermNode* root) {
      TInfoSinkBase& sink = getInfoSink().obj;
  
      // Write GLSL version.
      writeVersion(getShaderType(), root, sink);
  
      // Write emulated built-in functions if needed.
      getBuiltInFunctionEmulator().OutputEmulatedFunctionDefinition(
          sink, false);
  
      // Write translated shader.
      TOutputGLSL outputGLSL(sink);
      root->traverse(&outputGLSL);
  }