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

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• Author : Geoff Lang
  Date : 2015-06-17 16:19:29
  Hash : 91dbc188
  Message : Enable needed extensions in generated GLSL shaders and call them when possible. reland: use the defined preprocessor function. BUG=angleproject:1044 Change-Id: I6171708a2d55ec085ba2c598a1a863779842da6c Reviewed-on: https://chromium-review.googlesource.com/311270 Tryjob-Request: Geoff Lang <geofflang@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>

• src/compiler/translator/ExtensionGLSL.cpp

• //
  // Copyright (c) 2015 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.
  //
  // ExtensionGLSL.cpp: Implements the TExtensionGLSL class that tracks GLSL extension requirements
  // of shaders.
  
  #include "compiler/translator/ExtensionGLSL.h"
  
  #include "compiler/translator/VersionGLSL.h"
  
  TExtensionGLSL::TExtensionGLSL(ShShaderOutput output)
      : TIntermTraverser(true, false, false), mTargetVersion(ShaderOutputTypeToGLSLVersion(output))
  {
  }
  
  const std::set<std::string> &TExtensionGLSL::getEnabledExtensions() const
  {
      return mEnabledExtensions;
  }
  
  const std::set<std::string> &TExtensionGLSL::getRequiredExtensions() const
  {
      return mRequiredExtensions;
  }
  
  bool TExtensionGLSL::visitUnary(Visit, TIntermUnary *node)
  {
      checkOperator(node);
  
      return true;
  }
  
  bool TExtensionGLSL::visitAggregate(Visit, TIntermAggregate *node)
  {
      checkOperator(node);
  
      return true;
  }
  
  void TExtensionGLSL::checkOperator(TIntermOperator *node)
  {
      if (mTargetVersion < GLSL_VERSION_130)
      {
          return;
      }
  
      switch (node->getOp())
      {
          case EOpAbs:
              break;
  
          case EOpSign:
              break;
  
          case EOpMix:
              break;
  
          case EOpFloatBitsToInt:
          case EOpFloatBitsToUint:
          case EOpIntBitsToFloat:
          case EOpUintBitsToFloat:
              if (mTargetVersion < GLSL_VERSION_330)
              {
                  // Bit conversion functions cannot be emulated.
                  mRequiredExtensions.insert("GL_ARB_shader_bit_encoding");
              }
              break;
  
          case EOpPackSnorm2x16:
          case EOpPackHalf2x16:
          case EOpUnpackSnorm2x16:
          case EOpUnpackHalf2x16:
              if (mTargetVersion < GLSL_VERSION_420)
              {
                  mEnabledExtensions.insert("GL_ARB_shading_language_packing");
  
                  if (mTargetVersion < GLSL_VERSION_330)
                  {
                      // floatBitsToUint and uintBitsToFloat are needed to emulate
                      // packHalf2x16 and unpackHalf2x16 respectively and cannot be
                      // emulated themselves.
                      mRequiredExtensions.insert("GL_ARB_shader_bit_encoding");
                  }
              }
              break;
  
          case EOpPackUnorm2x16:
          case EOpUnpackUnorm2x16:
              if (mTargetVersion < GLSL_VERSION_410)
              {
                  mEnabledExtensions.insert("GL_ARB_shading_language_packing");
              }
              break;
  
          default:
              break;
      }
  }