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

• Show log

  Commit

• 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>
  

Download

• src/compiler/translator/OutputESSL.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/OutputESSL.h"
  
  namespace sh
  {
  
  TOutputESSL::TOutputESSL(TInfoSinkBase &objSink,
                           ShArrayIndexClampingStrategy clampingStrategy,
                           ShHashFunction64 hashFunction,
                           NameMap &nameMap,
                           TSymbolTable *symbolTable,
                           sh::GLenum shaderType,
                           int shaderVersion,
                           bool forceHighp,
                           ShCompileOptions compileOptions)
      : TOutputGLSLBase(objSink,
                        clampingStrategy,
                        hashFunction,
                        nameMap,
                        symbolTable,
                        shaderType,
                        shaderVersion,
                        SH_ESSL_OUTPUT,
                        compileOptions),
        mForceHighp(forceHighp)
  {}
  
  bool TOutputESSL::writeVariablePrecision(TPrecision precision)
  {
      if (precision == EbpUndefined)
          return false;
  
      TInfoSinkBase &out = objSink();
      if (mForceHighp)
          out << getPrecisionString(EbpHigh);
      else
          out << getPrecisionString(precision);
      return true;
  }
  
  ImmutableString TOutputESSL::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");
          }
      }
  
      return name;
  }
  
  }  // namespace sh
  

Download