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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <EGL/egl.h> // for EGLContext, EGLSurface
#include <GLES3/gl3.h> // for GLuint
#include <map> // for map
#include <stdint.h> // for uint32_t
#include <vector> // for vector
#include "base/Compiler.h" // for DISALLOW_COPY_AND_ASSIGN
#include "base/Lock.h" // for Lock
class ColorBuffer;
class FrameBuffer;
struct RenderThreadInfo;
// This class implements async readback of emugl ColorBuffers.
// It is meant to run on both the emugl framebuffer posting thread
// and a separate GL thread, with two main points of interaction:
class ReadbackWorker {
public:
ReadbackWorker() = default;
~ReadbackWorker();
// GL initialization (must be on the thread that
// will run getPixels)
void initGL();
// doNextReadback(): Call this from the emugl FrameBuffer::post thread
// or similar rendering thread.
// This will trigger an async glReadPixels of the current framebuffer.
// The post callback of Framebuffer will also be triggered, but
// in async mode it should do minimal work that involves |fbImage|.
// |repaint|: flag to prime async readback with multiple iterations
// so that the consumer of readback doesn't lag behind.
// |readbackBgra|: Whether to force the readback format as GL_BGRA_EXT,
// so that we get (depending on driver quality, heh) a gpu conversion of the
// readback image that is suitable for webrtc, which expects formats like that.
void doNextReadback(uint32_t displayId, ColorBuffer* cb, void* fbImage, bool repaint, bool readbackBgra);
// getPixels(): Run this on a separate GL thread. This retrieves the
// latest framebuffer that has been posted and read with doNextReadback.
// This is meant for apps like video encoding to use as input; they will
// need to do synchronized communication with the thread ReadbackWorker
// is running on.
void getPixels(uint32_t displayId, void* out, uint32_t bytes);
// Duplicates the last frame and generates a post events if
// there are no read events active.
// This is usually called when there was no doNextReadback activity
// for a few ms, to guarantee that end users see the final frame.
void flushPipeline(uint32_t displayId);
void setRecordDisplay(uint32_t displayId, uint32_t w, uint32_t h, bool add);
class recordDisplay {
public:
recordDisplay() = default;
recordDisplay(uint32_t displayId, uint32_t w, uint32_t h);
public:
uint32_t mReadPixelsIndexEven = 0;
uint32_t mReadPixelsIndexOdd = 1;
uint32_t mPrevReadPixelsIndex = 1;
uint32_t mMapCopyIndex = 0;
bool mIsCopying = false;
uint32_t mBufferSize = 0;
std::vector<GLuint> mBuffers = {};
uint32_t m_readbackCount = 0;
uint32_t mDisplayId = 0;
};
private:
EGLContext mContext;
EGLContext mFlushContext;
EGLSurface mSurf;
EGLSurface mFlushSurf;
FrameBuffer* mFb;
android::base::Lock mLock;
std::map<uint32_t, recordDisplay> mRecordDisplays;
DISALLOW_COPY_AND_ASSIGN(ReadbackWorker);
};
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