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

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• Hash : 09b04a2f
  Author :
  Date : 2016-12-15T13:30:26
  

  Add shader translator support for OVR_multiview
  
  The OVR_multiview and OVR_multiview2 extensions add gl_ViewID_OVR to
  shaders. gl_ViewID_OVR can be translated either as is in GLSL output
  or as a uniform by setting the SH_TRANSLATE_VIEWID_OVR_AS_UNIFORM
  compiler flag.
  
  If WebGL output is selected, the shaders will be validated according
  to proposed rules in the WEBGL_multiview spec.
  
  BUG=angleproject:1669
  TEST=angle_unittests
  
  Change-Id: I19ea3a6c8b4edb78be03f1a50a96bfef018870d0
  Reviewed-on: https://chromium-review.googlesource.com/422848
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  

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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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