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

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• Hash : dfa75e87
  Author :
  Date : 2017-01-23T09:43:06
  

  Add support for 4-parameter functions to BuiltInFunctionEmulator
  
  New entry points are needed to support built-ins with more parameters.
  
  Also, now that ops that are not function calls don't use the
  TIntermAggregate class any more, it's easier to exclude nodes that are
  not candidates for built-in emulation using a simple blacklist rather
  than to use a whitelist.
  
  Also includes function name style cleanup in BuiltInFunctionEmulator.
  
  This will make it possible to add necessary emulation for built-ins
  from ESSL 3.10.
  
  BUG=angleproject:1730
  TEST=angle_unittests
  
  Change-Id: If267fc68f5cb9b2ee6703cbcbbe4d157da44a7e0
  Reviewed-on: https://chromium-review.googlesource.com/431297
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  

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• 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/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(TIntermNode *root, ShCompileOptions compileOptions)
  {
      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, getTemporaryIndex());
  
      // 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();
      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 (compileOptions & SH_TRANSLATE_VIEWID_OVR_TO_UNIFORM &&
                       (iter->first == "GL_OVR_multiview" || iter->first == "GL_OVR_multiview2"))
              {
                  // No output
                  continue;
              }
              else
              {
                  sink << "#extension " << iter->first << " : " << getBehaviorString(iter->second)
                       << "\n";
              }
          }
      }
  }
  
  }  // namespace sh
  

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