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

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• Hash : 17b3c2f3
  Author :
  Date : 2019-10-14T14:13:59
  

  Implement SamplerVideoWEBGL for WEBGL_video_texture extension on desktop
  
  WEBGL_video_texture is an extension that will improve uploading video frame to WebGL performance.
  (https://www.khronos.org/registry/webgl/extensions/proposals/WEBGL_video_texture/)
  
  This extension introduced a new texture type TEXTURE_VIDEO_IMAGE_WEBGL and a new sampler type
  samplerVideoWEBGL to sample it.
  
  In chromium implementation, TEXTURE_VIDEO_IMAGE_WEBGL maps to different native texture type
  based on platform. On desktop, it maps to GL_TEXTURE2D(Currently supported). On Android, it
  should map to GL_TEXTURE_EXTERNAL(TODO). SamplerVideoWEBGL needs to be mapped to sampler2D or
  samplerExternalOES according to TEXTURE_VIDEO_IMAGE_WEBGL implementation.
  
  This patch implements samplerVideoWEBGL in Angle to support WEBGL_video_texture on desktop. In
  this case, samplerVideoWEBGL should map to sampler2D.
  
  Bug: chromium:776222, angleproject:3889
  Change-Id: Idb0a5fcde37ca75ccc1181226b91f257212e7500
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1866274
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/compiler/translator/OutputGLSL.cpp

• //
  // Copyright 2002 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/OutputGLSL.h"
  
  #include "compiler/translator/Compiler.h"
  
  namespace sh
  {
  
  TOutputGLSL::TOutputGLSL(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)
  {}
  
  bool TOutputGLSL::writeVariablePrecision(TPrecision)
  {
      return false;
  }
  
  void TOutputGLSL::visitSymbol(TIntermSymbol *node)
  {
      TInfoSinkBase &out = objSink();
  
      // All the special cases are built-ins, so if it's not a built-in we can return early.
      if (node->variable().symbolType() != SymbolType::BuiltIn)
      {
          TOutputGLSLBase::visitSymbol(node);
          return;
      }
  
      // Some built-ins get a special translation.
      const ImmutableString &name = node->getName();
      if (name == "gl_FragDepthEXT")
      {
          out << "gl_FragDepth";
      }
      else if (name == "gl_FragColor" && sh::IsGLSL130OrNewer(getShaderOutput()))
      {
          out << "webgl_FragColor";
      }
      else if (name == "gl_FragData" && sh::IsGLSL130OrNewer(getShaderOutput()))
      {
          out << "webgl_FragData";
      }
      else if (name == "gl_SecondaryFragColorEXT")
      {
          out << "angle_SecondaryFragColor";
      }
      else if (name == "gl_SecondaryFragDataEXT")
      {
          out << "angle_SecondaryFragData";
      }
      else
      {
          TOutputGLSLBase::visitSymbol(node);
      }
  }
  
  ImmutableString TOutputGLSL::translateTextureFunction(const ImmutableString &name,
                                                        const ShCompileOptions &option)
  {
      // Check WEBGL_video_texture invocation first.
      if (name == "textureVideoWEBGL")
      {
          if (option & SH_TAKE_VIDEO_TEXTURE_AS_EXTERNAL_OES)
          {
              // TODO(http://anglebug.com/3889): Implement external image situation.
              UNIMPLEMENTED();
              return ImmutableString("");
          }
          else
          {
              // Default translating textureVideoWEBGL to texture2D.
              return ImmutableString("texture2D");
          }
      }
  
      static const char *simpleRename[]       = {"texture2DLodEXT",
                                           "texture2DLod",
                                           "texture2DProjLodEXT",
                                           "texture2DProjLod",
                                           "textureCubeLodEXT",
                                           "textureCubeLod",
                                           "texture2DGradEXT",
                                           "texture2DGradARB",
                                           "texture2DProjGradEXT",
                                           "texture2DProjGradARB",
                                           "textureCubeGradEXT",
                                           "textureCubeGradARB",
                                           nullptr,
                                           nullptr};
      static const char *legacyToCoreRename[] = {
          "texture2D", "texture", "texture2DProj", "textureProj", "texture2DLod", "textureLod",
          "texture2DProjLod", "textureProjLod", "texture2DRect", "texture", "texture2DRectProj",
          "textureProj", "textureCube", "texture", "textureCubeLod", "textureLod",
          // Extensions
          "texture2DLodEXT", "textureLod", "texture2DProjLodEXT", "textureProjLod",
          "textureCubeLodEXT", "textureLod", "texture2DGradEXT", "textureGrad",
          "texture2DProjGradEXT", "textureProjGrad", "textureCubeGradEXT", "textureGrad", "texture3D",
          "texture", "texture3DProj", "textureProj", "texture3DLod", "textureLod", "texture3DProjLod",
          "textureProjLod", nullptr, nullptr};
      const char **mapping =
          (sh::IsGLSL130OrNewer(getShaderOutput())) ? legacyToCoreRename : simpleRename;
  
      for (int i = 0; mapping[i] != nullptr; i += 2)
      {
          if (name == mapping[i])
          {
              return ImmutableString(mapping[i + 1]);
          }
      }
  
      return name;
  }
  
  }  // namespace sh
  

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