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

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• Author : Olli Etuaho
  Date : 2015-08-05 13:25:08
  Hash : 217fe6ec
  Message : Detect when built-in modf requires an l-value in AST traversal This fixes an omission that out parameter tracking had inherited from EmulatePrecision. Accurate tracking of when values are written is required for converting dynamic indexing of vectors and matrices to function calls. A new test covering this is added to angle_unittests. TEST=angle_unittests BUG=angleproject:1116 Change-Id: I05c5fd60355117d0053b84110748ae221375a790 Reviewed-on: https://chromium-review.googlesource.com/290562 Reviewed-by: Zhenyao Mo <zmo@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Olli Etuaho <oetuaho@nvidia.com>

• 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(getSymbolTable(), getShaderVersion());
          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)
      {
          const bool mayHaveESSL1SecondaryOutputs =
              IsExtensionEnabled(getExtensionBehavior(), "GL_EXT_blend_func_extended") &&
              getShaderVersion() == 100;
          const bool declareGLFragmentOutputs = IsGLSL130OrNewer(getOutputType());
  
          bool hasGLFragColor          = false;
          bool hasGLFragData           = false;
          bool hasGLSecondaryFragColor = false;
          bool hasGLSecondaryFragData  = false;
  
          for (const auto &outputVar : outputVariables)
          {
              if (declareGLFragmentOutputs)
              {
                  if (outputVar.name == "gl_FragColor")
                  {
                      ASSERT(!hasGLFragColor);
                      hasGLFragColor = true;
                      continue;
                  }
                  else if (outputVar.name == "gl_FragData")
                  {
                      ASSERT(!hasGLFragData);
                      hasGLFragData = true;
                      continue;
                  }
              }
              if (mayHaveESSL1SecondaryOutputs)
              {
                  if (outputVar.name == "gl_SecondaryFragColorEXT")
                  {
                      ASSERT(!hasGLSecondaryFragColor);
                      hasGLSecondaryFragColor = true;
                      continue;
                  }
                  else if (outputVar.name == "gl_SecondaryFragDataEXT")
                  {
                      ASSERT(!hasGLSecondaryFragData);
                      hasGLSecondaryFragData = true;
                      continue;
                  }
              }
          }
          ASSERT(!((hasGLFragColor || hasGLSecondaryFragColor) &&
                   (hasGLFragData || hasGLSecondaryFragData)));
          if (hasGLFragColor)
          {
              sink << "out vec4 webgl_FragColor;\n";
          }
          if (hasGLFragData)
          {
              sink << "out vec4 webgl_FragData[gl_MaxDrawBuffers];\n";
          }
          if (hasGLSecondaryFragColor)
          {
              sink << "out vec4 angle_SecondaryFragColor;\n";
          }
          if (hasGLSecondaryFragData)
          {
              sink << "out vec4 angle_SecondaryFragData[" << getResources().MaxDualSourceDrawBuffers
                   << "];\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";
          }
      }
  }