OutputESSL.cpp

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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/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

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

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