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

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• Hash : 0932df61
  Author :
  Date : 2015-07-21T14:35:11
  

  Expose GL built-in output variables in ShGetOutputVariables
  
  Expose GL built-in output variables in ShGetOutputVariables.
  Currently gl_FragColor, gl_FragData and gl_FragDepthEXT are exposed.
  
  The output variable names in the returned array are the input shader names,
  not the output shader names.
  
  This is needed in future features in which the emulation layer (command
  buffer/libANGLE) needs to know which output variables caller used.
  
  Example of such a feature is EXT_blend_func_extended, where
  gl_SecondaryFragColorEXT and gl_SecondaryFragDataEXT cause the need
  to bind the emulated output variables to their respective color
  indices.
  
  BUG=angleproject:1085
  TEST=angle_unittests
  
  Change-Id: I7ca3e0fe6bdd3e3c66113518aa771cbb013fc014
  Reviewed-on: https://chromium-review.googlesource.com/287230
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Zhenyao Mo <zmo@chromium.org>
  Tested-by: Kimmo Kinnunen <kkinnunen@nvidia.com>
  

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• src/compiler/translator/TranslatorGLSL.cpp

• //
  // Copyright (c) 2002-2013 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/translator/TranslatorGLSL.h"
  
  #include "angle_gl.h"
  #include "compiler/translator/BuiltInFunctionEmulatorGLSL.h"
  #include "compiler/translator/EmulatePrecision.h"
  #include "compiler/translator/OutputGLSL.h"
  #include "compiler/translator/VersionGLSL.h"
  
  TranslatorGLSL::TranslatorGLSL(sh::GLenum type,
                                 ShShaderSpec spec,
                                 ShShaderOutput output)
      : TCompiler(type, spec, output) {
  }
  
  void TranslatorGLSL::initBuiltInFunctionEmulator(BuiltInFunctionEmulator *emu, int compileOptions)
  {
      if (compileOptions & SH_EMULATE_BUILT_IN_FUNCTIONS)
      {
          InitBuiltInFunctionEmulatorForGLSLWorkarounds(emu, getShaderType());
      }
  
      int targetGLSLVersion = ShaderOutputTypeToGLSLVersion(getOutputType());
      InitBuiltInFunctionEmulatorForGLSLMissingFunctions(emu, getShaderType(), targetGLSLVersion);
  }
  
  void TranslatorGLSL::translate(TIntermNode *root, int) {
      TInfoSinkBase& sink = getInfoSink().obj;
  
      // Write GLSL version.
      writeVersion(root);
  
      writePragma();
  
      // Write extension behaviour as needed
      writeExtensionBehavior();
  
      bool precisionEmulation = getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
  
      if (precisionEmulation)
      {
          EmulatePrecision emulatePrecision;
          root->traverse(&emulatePrecision);
          emulatePrecision.updateTree();
          emulatePrecision.writeEmulationHelpers(sink, getOutputType());
      }
  
      // Write emulated built-in functions if needed.
      if (!getBuiltInFunctionEmulator().IsOutputEmpty())
      {
          sink << "// BEGIN: Generated code for built-in function emulation\n\n";
          sink << "#define webgl_emu_precision\n\n";
          getBuiltInFunctionEmulator().OutputEmulatedFunctions(sink);
          sink << "// END: Generated code for built-in function emulation\n\n";
      }
  
      // Write array bounds clamping emulation if needed.
      getArrayBoundsClamper().OutputClampingFunctionDefinition(sink);
  
      // Declare gl_FragColor and glFragData as webgl_FragColor and webgl_FragData
      // if it's core profile shaders and they are used.
      if (getShaderType() == GL_FRAGMENT_SHADER && IsGLSL130OrNewer(getOutputType()))
      {
          bool usesGLFragColor = false;
          bool usesGLFragData = false;
          for (auto outputVar : outputVariables)
          {
              if (outputVar.name == "gl_FragColor")
              {
                  usesGLFragColor = true;
              }
              else if (outputVar.name == "gl_FragData")
              {
                  usesGLFragData = true;
              }
          }
          ASSERT(!(usesGLFragColor && usesGLFragData));
          if (usesGLFragColor)
          {
              sink << "out vec4 webgl_FragColor;\n";
          }
          if (usesGLFragData)
          {
              sink << "out vec4 webgl_FragData[gl_MaxDrawBuffers];\n";
          }
      }
  
      // Write translated shader.
      TOutputGLSL outputGLSL(sink,
                             getArrayIndexClampingStrategy(),
                             getHashFunction(),
                             getNameMap(),
                             getSymbolTable(),
                             getShaderVersion(),
                             getOutputType());
      root->traverse(&outputGLSL);
  }
  
  void TranslatorGLSL::writeVersion(TIntermNode *root)
  {
      TVersionGLSL versionGLSL(getShaderType(), getPragma(), getOutputType());
      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)
      {
          TInfoSinkBase& sink = getInfoSink().obj;
          sink << "#version " << version << "\n";
      }
  }
  
  void TranslatorGLSL::writeExtensionBehavior() {
      TInfoSinkBase& sink = getInfoSink().obj;
      const TExtensionBehavior& extBehavior = getExtensionBehavior();
      for (TExtensionBehavior::const_iterator iter = extBehavior.begin();
           iter != extBehavior.end(); ++iter) {
          if (iter->second == EBhUndefined)
              continue;
  
          // For GLSL output, we don't need to emit most extensions explicitly,
          // but some we need to translate.
          if (iter->first == "GL_EXT_shader_texture_lod") {
              sink << "#extension GL_ARB_shader_texture_lod : "
                   << getBehaviorString(iter->second) << "\n";
          }
      }
  }
  

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