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

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• Hash : e794cd86
  Author :
  Date : 2017-01-13T17:29:51
  

  Vulkan: Implement new GLSL translator back-end.
  
  The Vulkan GLSL translator back-end will handle validating and
  translating our WebGL/ESSL shaders into Vulkan-specific GLSL.
  
  glslang (the Vulkan one) accepts both GLSL and GLSL ES shaders
  as inputs, and both the desktop and ESSL back-ends give
  incompleteness warnings when used. For now, use the desktop GL
  450 as a target for Vulkan GLSL.
  
  The Vulkan-specific changes are currently only to add locations
  to every vertex input and fragment output.
  
  BUG=angleproject:1575
  
  Change-Id: I7c3f32f522e9d18e5f8618eb7927336bf4fbdcf2
  Reviewed-on: https://chromium-review.googlesource.com/412266
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/compiler/translator/OutputVulkanGLSL.cpp

• //
  // Copyright (c) 2016 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.
  //
  // OutputVulkanGLSL:
  //   Code that outputs shaders that fit GL_KHR_vulkan_glsl.
  //   The shaders are then fed into glslang to spit out SPIR-V (libANGLE-side).
  //   See: https://www.khronos.org/registry/vulkan/specs/misc/GL_KHR_vulkan_glsl.txt
  //
  
  #include "compiler/translator/OutputVulkanGLSL.h"
  
  namespace sh
  {
  
  TOutputVulkanGLSL::TOutputVulkanGLSL(TInfoSinkBase &objSink,
                                       ShArrayIndexClampingStrategy clampingStrategy,
                                       ShHashFunction64 hashFunction,
                                       NameMap &nameMap,
                                       TSymbolTable &symbolTable,
                                       sh::GLenum shaderType,
                                       int shaderVersion,
                                       ShShaderOutput output,
                                       ShCompileOptions compileOptions)
      : TOutputGLSLBase(objSink,
                        clampingStrategy,
                        hashFunction,
                        nameMap,
                        symbolTable,
                        shaderType,
                        shaderVersion,
                        output,
                        compileOptions)
  {
  }
  
  // TODO(jmadill): This is not complete.
  void TOutputVulkanGLSL::writeLayoutQualifier(const TType &type)
  {
      TInfoSinkBase &out                      = objSink();
      const TLayoutQualifier &layoutQualifier = type.getLayoutQualifier();
      out << "layout(";
  
      if (type.getQualifier() == EvqAttribute || type.getQualifier() == EvqFragmentOut ||
          type.getQualifier() == EvqVertexIn)
      {
          // TODO(jmadill): Multiple output locations.
          out << "location = "
              << "0";
      }
  
      if (IsImage(type.getBasicType()) && layoutQualifier.imageInternalFormat != EiifUnspecified)
      {
          ASSERT(type.getQualifier() == EvqTemporary || type.getQualifier() == EvqUniform);
          out << getImageInternalFormatString(layoutQualifier.imageInternalFormat);
      }
  
      out << ") ";
  }
  
  bool TOutputVulkanGLSL::writeVariablePrecision(TPrecision precision)
  {
      if (precision == EbpUndefined)
          return false;
  
      TInfoSinkBase &out = objSink();
      out << getPrecisionString(precision);
      return true;
  }
  
  void TOutputVulkanGLSL::visitSymbol(TIntermSymbol *node)
  {
      TInfoSinkBase &out = objSink();
  
      const TString &symbol = node->getSymbol();
      if (symbol == "gl_FragColor")
      {
          out << "webgl_FragColor";
      }
      else if (symbol == "gl_FragData")
      {
          out << "webgl_FragData";
      }
      else
      {
          TOutputGLSLBase::visitSymbol(node);
      }
  }
  
  }  // namespace sh
  

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