98 lines
3 KiB
C++
98 lines
3 KiB
C++
/*
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* Copyright (C) 2015 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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#pragma once
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#include <condition_variable>
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#include <functional>
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#include <map>
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#include <mutex>
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#include <thread>
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#include <android-base/thread_annotations.h>
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#include "utils/fd.h"
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namespace android::drm_hwcomposer {
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struct DrmDisplayPipeline;
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class VSyncWorker {
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public:
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using VsyncTimestampCallback = std::function<void(int64_t /*timestamp*/,
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uint32_t /*period*/)>;
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~VSyncWorker();
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auto static CreateInstance(std::shared_ptr<DrmDisplayPipeline> &pipe)
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-> std::unique_ptr<VSyncWorker>;
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// Set the expected vsync period. Resets internal timestamp tracking until the
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// next vsync event is tracked.
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void SetVsyncPeriodNs(uint32_t vsync_period_ns);
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// Set or clear a callback to be fired on vsync.
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void SetTimestampCallback(std::optional<VsyncTimestampCallback> &&callback);
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// Enable vsync timestamp tracking. GetLastVsyncTimestamp will return 0 if
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// vsync tracking is disabled, or if no vsync has happened since it was
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// enabled.
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void SetVsyncTimestampTracking(bool enabled);
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uint32_t GetLastVsyncTimestamp();
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void AddLastPresentFence(SharedFd &fence);
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// Get the next predicted vsync timestamp after |time|, based on the last
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// recorded vsync timestamp and the current vsync period.
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int64_t GetNextVsyncTimestamp(int64_t time);
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void StopThread();
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private:
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VSyncWorker() = default;
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void ThreadFn();
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int64_t GetPhasedVSync(int64_t frame_ns, int64_t current) REQUIRES(mutex_);
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int SyntheticWaitVBlank(int64_t *timestamp);
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void UpdateVSyncControl();
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bool ShouldEnable() const REQUIRES(mutex_);
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void UpdateLastVsyncTimeWithPresentTime() REQUIRES(mutex_);
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SharedFd drm_fd_;
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uint32_t high_crtc_ = 0;
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bool enabled_ GUARDED_BY(mutex_) = false;
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bool thread_exit_ GUARDED_BY(mutex_) = false;
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std::optional<int64_t> last_timestamp_ GUARDED_BY(mutex_);
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// Default to 60Hz refresh rate
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static constexpr uint32_t kDefaultVSPeriodNs = 16666666;
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uint32_t vsync_period_ns_ GUARDED_BY(mutex_) = kDefaultVSPeriodNs;
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bool enable_vsync_timestamps_ GUARDED_BY(mutex_) = false;
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bool last_timestamp_is_fresh_ GUARDED_BY(mutex_) = false;
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std::optional<VsyncTimestampCallback> callback_ GUARDED_BY(mutex_);
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SharedFd last_present_fence_ GUARDED_BY(mutex_);
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std::condition_variable cv_;
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std::thread vswt_;
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std::mutex mutex_;
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};
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} // namespace android::drm_hwcomposer
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