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

• Show log

  Commit

• Hash : 4dd06d5d
  Author :
  Date : 2017-07-05T12:41:06
  

  Set proper symbol ids on temporary symbol nodes
  
  Temporary symbols used to all have symbol id 0. Now they get assigned
  unique symbol ids. This makes it possible to keep track of them
  according to the symbol id instead of their name, paving way to more
  robust AST handling in the future.
  
  BUG=angleproject:1490
  TEST=angle_unittests
  
  Change-Id: I292e2e483cc39173524fd30a30b48c4c808442e5
  Reviewed-on: https://chromium-review.googlesource.com/559335
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  

Download

• src/compiler/translator/TranslatorESSL.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/TranslatorESSL.h"
  
  #include "compiler/translator/BuiltInFunctionEmulatorGLSL.h"
  #include "compiler/translator/EmulatePrecision.h"
  #include "compiler/translator/PrunePureLiteralStatements.h"
  #include "compiler/translator/RecordConstantPrecision.h"
  #include "compiler/translator/OutputESSL.h"
  #include "angle_gl.h"
  
  namespace sh
  {
  
  TranslatorESSL::TranslatorESSL(sh::GLenum type, ShShaderSpec spec)
      : TCompiler(type, spec, SH_ESSL_OUTPUT)
  {
  }
  
  void TranslatorESSL::initBuiltInFunctionEmulator(BuiltInFunctionEmulator *emu,
                                                   ShCompileOptions compileOptions)
  {
      if (compileOptions & SH_EMULATE_ATAN2_FLOAT_FUNCTION)
      {
          InitBuiltInAtanFunctionEmulatorForGLSLWorkarounds(emu);
      }
  }
  
  void TranslatorESSL::translate(TIntermBlock *root, ShCompileOptions compileOptions)
  {
      // The ESSL output doesn't define a default precision for float, so float literal statements
      // end up with no precision which is invalid ESSL.
      PrunePureLiteralStatements(root);
  
      TInfoSinkBase &sink = getInfoSink().obj;
  
      int shaderVer = getShaderVersion();
      if (shaderVer > 100)
      {
          sink << "#version " << shaderVer << " es\n";
      }
  
      // Write built-in extension behaviors.
      writeExtensionBehavior(compileOptions);
  
      // Write pragmas after extensions because some drivers consider pragmas
      // like non-preprocessor tokens.
      writePragma(compileOptions);
  
      bool precisionEmulation =
          getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
  
      if (precisionEmulation)
      {
          EmulatePrecision emulatePrecision(getSymbolTable(), shaderVer);
          root->traverse(&emulatePrecision);
          emulatePrecision.updateTree();
          emulatePrecision.writeEmulationHelpers(sink, shaderVer, SH_ESSL_OUTPUT);
      }
  
      RecordConstantPrecision(root, getTemporaryId());
  
      // Write emulated built-in functions if needed.
      if (!getBuiltInFunctionEmulator().isOutputEmpty())
      {
          sink << "// BEGIN: Generated code for built-in function emulation\n\n";
          if (getShaderType() == GL_FRAGMENT_SHADER)
          {
              sink << "#if defined(GL_FRAGMENT_PRECISION_HIGH)\n"
                   << "#define webgl_emu_precision highp\n"
                   << "#else\n"
                   << "#define webgl_emu_precision mediump\n"
                   << "#endif\n\n";
          }
          else
          {
              sink << "#define webgl_emu_precision highp\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);
  
      if (getShaderType() == GL_COMPUTE_SHADER && isComputeShaderLocalSizeDeclared())
      {
          const sh::WorkGroupSize &localSize = getComputeShaderLocalSize();
          sink << "layout (local_size_x=" << localSize[0] << ", local_size_y=" << localSize[1]
               << ", local_size_z=" << localSize[2] << ") in;\n";
      }
  
      // Write translated shader.
      TOutputESSL outputESSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(),
                             getSymbolTable(), getShaderType(), shaderVer, precisionEmulation,
                             compileOptions);
  
      if (compileOptions & SH_TRANSLATE_VIEWID_OVR_TO_UNIFORM)
      {
          TName uniformName(TString("ViewID_OVR"));
          uniformName.setInternal(true);
          sink << "highp uniform int " << outputESSL.hashName(uniformName) << ";\n";
      }
  
      root->traverse(&outputESSL);
  }
  
  bool TranslatorESSL::shouldFlattenPragmaStdglInvariantAll()
  {
      // Not necessary when translating to ESSL.
      return false;
  }
  
  void TranslatorESSL::writeExtensionBehavior(ShCompileOptions compileOptions)
  {
      TInfoSinkBase &sink                   = getInfoSink().obj;
      const TExtensionBehavior &extBehavior = getExtensionBehavior();
      const bool isMultiviewExtEmulated =
          (compileOptions & (SH_TRANSLATE_VIEWID_OVR_TO_UNIFORM |
                             SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW)) != 0u;
  
      for (TExtensionBehavior::const_iterator iter = extBehavior.begin(); iter != extBehavior.end();
           ++iter)
      {
          if (iter->second != EBhUndefined)
          {
              if (getResources().NV_shader_framebuffer_fetch &&
                  iter->first == "GL_EXT_shader_framebuffer_fetch")
              {
                  sink << "#extension GL_NV_shader_framebuffer_fetch : "
                       << getBehaviorString(iter->second) << "\n";
              }
              else if (getResources().NV_draw_buffers && iter->first == "GL_EXT_draw_buffers")
              {
                  sink << "#extension GL_NV_draw_buffers : " << getBehaviorString(iter->second)
                       << "\n";
              }
              else if (isMultiviewExtEmulated &&
                       (iter->first == "GL_OVR_multiview" || iter->first == "GL_OVR_multiview2"))
              {
                  // No output
                  continue;
              }
              else
              {
                  sink << "#extension " << iter->first << " : " << getBehaviorString(iter->second)
                       << "\n";
              }
          }
      }
  }
  
  }  // namespace sh
  

Download