1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #pragma once 17 18 #include <map> 19 #include <stdint.h> 20 #include <vector> 21 22 #include <EGL/egl.h> 23 #include <GLES3/gl3.h> 24 25 #include "aemu/base/Compiler.h" 26 #include "aemu/base/synchronization/Lock.h" 27 #include "DisplaySurfaceGl.h" 28 #include "ReadbackWorker.h" 29 30 namespace gfxstream { 31 class ColorBuffer; 32 } // namespace gfxstream 33 34 namespace gfxstream { 35 namespace gl { 36 37 // This class implements async readback of emugl ColorBuffers. 38 // It is meant to run on both the emugl framebuffer posting thread 39 // and a separate GL thread, with two main points of interaction: 40 class ReadbackWorkerGl : public ReadbackWorker { 41 public: 42 ReadbackWorkerGl(std::unique_ptr<DisplaySurfaceGl> surface, 43 std::unique_ptr<DisplaySurfaceGl> flushSurface); 44 45 ~ReadbackWorkerGl(); 46 47 // GL initialization (must be on the thread that 48 // will run getPixels) 49 void init() override; 50 51 // doNextReadback(): Call this from the emugl FrameBuffer::post thread 52 // or similar rendering thread. 53 // This will trigger an async glReadPixels of the current framebuffer. 54 // The post callback of Framebuffer will also be triggered, but 55 // in async mode it should do minimal work that involves |fbImage|. 56 // |repaint|: flag to prime async readback with multiple iterations 57 // so that the consumer of readback doesn't lag behind. 58 // |readbackBgra|: Whether to force the readback format as GL_BGRA_EXT, 59 // so that we get (depending on driver quality, heh) a gpu conversion of the 60 // readback image that is suitable for webrtc, which expects formats like that. 61 DoNextReadbackResult doNextReadback(uint32_t displayId, 62 ColorBuffer* cb, 63 void* fbImage, 64 bool repaint, 65 bool readbackBgra) override; 66 67 // getPixels(): Run this on a separate GL thread. This retrieves the 68 // latest framebuffer that has been posted and read with doNextReadback. 69 // This is meant for apps like video encoding to use as input; they will 70 // need to do synchronized communication with the thread ReadbackWorker 71 // is running on. 72 void getPixels(uint32_t displayId, void* out, uint32_t bytes) override; 73 74 // Duplicates the last frame and generates a post events if 75 // there are no read events active. 76 // This is usually called when there was no doNextReadback activity 77 // for a few ms, to guarantee that end users see the final frame. 78 FlushResult flushPipeline(uint32_t displayId) override; 79 80 void initReadbackForDisplay(uint32_t displayId, uint32_t w, uint32_t h) override; 81 82 void deinitReadbackForDisplay(uint32_t displayId) override; 83 84 class TrackedDisplay { 85 public: 86 TrackedDisplay() = default; 87 TrackedDisplay(uint32_t displayId, uint32_t w, uint32_t h); 88 89 uint32_t mReadPixelsIndexEven = 0; 90 uint32_t mReadPixelsIndexOdd = 1; 91 uint32_t mPrevReadPixelsIndex = 1; 92 uint32_t mMapCopyIndex = 0; 93 bool mIsCopying = false; 94 uint32_t mBufferSize = 0; 95 std::vector<GLuint> mBuffers = {}; 96 uint32_t m_readbackCount = 0; 97 uint32_t mDisplayId = 0; 98 }; 99 100 private: 101 android::base::Lock mLock; 102 103 std::unique_ptr<DisplaySurfaceGl> mSurface; 104 std::unique_ptr<DisplaySurfaceGl> mFlushSurface; 105 106 std::map<uint32_t, TrackedDisplay> mTrackedDisplays; 107 108 DISALLOW_COPY_AND_ASSIGN(ReadbackWorkerGl); 109 }; 110 111 } // namespace gl 112 } // namespace gfxstream 113