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

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• Hash : e839078e
  Author :
  Date : 2017-04-06T14:34:43
  

  compiler: Prune literal statements when outputting ESSL
  
  The ESSL output doesn't have a default precision for floats, this causes
  float literal statements to not have any precision defined, which is an
  error. We fix this by removing literal statements as they are dead code
  anyway.
  
  BUG=angleproject:1967
  
  Change-Id: I498f4f8495f854240ee8a2182415bf982c5166a4
  Reviewed-on: https://chromium-review.googlesource.com/470268
  Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
  Commit-Queue: 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/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(TIntermNode *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, 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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