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

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  • Author : Yan
    Date : 2019-10-14 14:13:59
    Hash : 17b3c2f3
    Message : 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>

  • src/compiler/translator/OutputGLSL.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_OUTPUTGLSL_H_
#define COMPILER_TRANSLATOR_OUTPUTGLSL_H_

#include "compiler/translator/OutputGLSLBase.h"

namespace sh
{

class TOutputGLSL : public TOutputGLSLBase
{
  public:
    TOutputGLSL(TInfoSinkBase &objSink,
                ShArrayIndexClampingStrategy clampingStrategy,
                ShHashFunction64 hashFunction,
                NameMap &nameMap,
                TSymbolTable *symbolTable,
                sh::GLenum shaderType,
                int shaderVersion,
                ShShaderOutput output,
                ShCompileOptions compileOptions);

  protected:
    bool writeVariablePrecision(TPrecision) override;
    void visitSymbol(TIntermSymbol *node) override;
    ImmutableString translateTextureFunction(const ImmutableString &name,
                                             const ShCompileOptions &option) override;
};

}  // namespace sh

#endif  // COMPILER_TRANSLATOR_OUTPUTGLSL_H_