100 lines
3.7 KiB
C++
100 lines
3.7 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef CPP_EVS_SAMPLEDRIVER_AIDL_INCLUDE_EVSGLDISPLAY_H
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#define CPP_EVS_SAMPLEDRIVER_AIDL_INCLUDE_EVSGLDISPLAY_H
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#include "GlWrapper.h"
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#include <aidl/android/frameworks/automotive/display/ICarDisplayProxy.h>
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#include <aidl/android/hardware/automotive/evs/BnEvsDisplay.h>
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#include <aidl/android/hardware/automotive/evs/BufferDesc.h>
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#include <aidl/android/hardware/automotive/evs/DisplayDesc.h>
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#include <aidl/android/hardware/automotive/evs/DisplayState.h>
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#include <semaphore.h>
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#include <thread>
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namespace aidl::android::hardware::automotive::evs::implementation {
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namespace automotivedisplay = ::aidl::android::frameworks::automotive::display;
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namespace aidlevs = ::aidl::android::hardware::automotive::evs;
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class EvsGlDisplay final : public ::aidl::android::hardware::automotive::evs::BnEvsDisplay {
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public:
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// Methods from ::aidl::android::hardware::automotive::evs::IEvsDisplay follow.
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::ndk::ScopedAStatus getDisplayInfo(aidlevs::DisplayDesc* _aidl_return) override;
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::ndk::ScopedAStatus getDisplayState(aidlevs::DisplayState* _aidl_return) override;
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::ndk::ScopedAStatus getTargetBuffer(aidlevs::BufferDesc* _aidl_return) override;
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::ndk::ScopedAStatus returnTargetBufferForDisplay(const evs::BufferDesc& buffer) override;
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::ndk::ScopedAStatus setDisplayState(aidlevs::DisplayState state) override;
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// Implementation details
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EvsGlDisplay(const std::shared_ptr<automotivedisplay::ICarDisplayProxy>& service,
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uint64_t displayId);
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virtual ~EvsGlDisplay() override;
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// This gets called if another caller "steals" ownership of the display
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void forceShutdown();
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private:
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// A graphics buffer into which we'll store images. This member variable
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// will be protected by semaphores.
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struct BufferRecord {
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::aidl::android::hardware::graphics::common::HardwareBufferDescription description;
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buffer_handle_t handle;
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int fingerprint;
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} mBuffer;
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// State of a rendering thread
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enum class RenderThreadStates {
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kStopped = 0,
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kStopping = 1,
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kRunning = 2,
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};
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uint64_t mDisplayId;
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aidlevs::DisplayDesc mInfo;
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aidlevs::DisplayState mRequestedState GUARDED_BY(mLock) = aidlevs::DisplayState::NOT_VISIBLE;
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std::shared_ptr<automotivedisplay::ICarDisplayProxy> mDisplayProxy;
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GlWrapper mGlWrapper;
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mutable std::mutex mLock;
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// This tells us whether or not our buffer is in use. Protected by
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// semaphores.
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bool mBufferBusy = false;
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// Variables to synchronize a rendering thread w/ main and binder threads
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std::thread mRenderThread;
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std::atomic<RenderThreadStates> mState = RenderThreadStates::kRunning;
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bool mBufferReady = false;
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// Render the contents of forwarded buffers
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void renderFrames();
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// Initialize GL in the context of a caller's thread and prepare a graphic
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// buffer to use.
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bool initializeGlContextLocked() REQUIRES(mLock);
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sem_t mBufferReadyToUse;
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sem_t mBufferReadyToRender;
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sem_t mBufferDone;
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};
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} // namespace aidl::android::hardware::automotive::evs::implementation
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#endif // CPP_EVS_SAMPLEDRIVER_AIDL_INCLUDE_EVSGLDISPLAY_H
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