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

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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/OutputESSL.h

• //
  // 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.
  //
  
  #ifndef COMPILER_TRANSLATOR_OUTPUTESSL_H_
  #define COMPILER_TRANSLATOR_OUTPUTESSL_H_
  
  #include "compiler/translator/OutputGLSLBase.h"
  
  namespace sh
  {
  
  class TOutputESSL : public TOutputGLSLBase
  {
    public:
      TOutputESSL(TInfoSinkBase &objSink,
                  ShArrayIndexClampingStrategy clampingStrategy,
                  ShHashFunction64 hashFunction,
                  NameMap &nameMap,
                  TSymbolTable *symbolTable,
                  sh::GLenum shaderType,
                  int shaderVersion,
                  bool forceHighp,
                  ShCompileOptions compileOptions);
  
    protected:
      bool writeVariablePrecision(TPrecision precision) override;
      ImmutableString translateTextureFunction(const ImmutableString &name,
                                               const ShCompileOptions &option) override;
  
    private:
      bool mForceHighp;
  };
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_OUTPUTESSL_H_
  

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