1 #ifndef DALI_INTERNAL_COMBINED_UPDATE_RENDER_CONTROLLER_H
2 #define DALI_INTERNAL_COMBINED_UPDATE_RENDER_CONTROLLER_H
5 * Copyright (c) 2018 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <semaphore.h>
24 #include <dali/integration-api/core.h>
25 #include <dali/devel-api/threading/conditional-wait.h>
28 #include <dali/integration-api/thread-synchronization-interface.h>
29 #include <dali/internal/system/common/performance-interface.h>
30 #include <dali/internal/system/common/fps-tracker.h>
31 #include <dali/internal/adaptor/common/thread-controller-interface.h>
32 #include <dali/internal/system/common/update-status-logger.h>
33 #include <dali/internal/window-system/common/display-connection.h>
39 class RenderSurfaceInterface;
40 class TriggerEventInterface;
48 class AdaptorInternalServices;
49 class EnvironmentOptions;
52 * @brief Two threads where events/application interaction is handled on the main/event thread and the Update & Render
53 * happen on the other thread.
57 * a. Main/Event Thread.
58 * b. Update/Render Thread.
59 * 2. There is NO VSync thread:
60 * a. We retrieve the time before Update.
61 * b. Then retrieve the time after Render.
62 * c. We calculate the difference between these two times and if:
63 * i. The difference is less than the default frame time, we sleep.
64 * ii. If it’s more or the same, we continue.
65 * 3. On the update/render thread, if we discover that we do not need to do any more updates, we use a trigger-event
66 * to inform the main/event thread. This is then processed as soon as the event thread is able to do so where it
67 * is easier to make a decision about whether we should stop the update/render thread or not (depending on any
68 * update requests etc.).
69 * 4. The main thread is blocked while the surface is being replaced.
70 * 5. When we resume from paused, elapsed time is used for the animations, i.e. the could have finished while we were paused.
71 * However, FinishedSignal emission will only happen upon resumption.
72 * 6. Elapsed time is NOT used while if we are waking up from a sleep state or doing an UpdateOnce.
74 class CombinedUpdateRenderController : public ThreadControllerInterface,
75 public ThreadSynchronizationInterface
82 CombinedUpdateRenderController( AdaptorInternalServices& adaptorInterfaces, const EnvironmentOptions& environmentOptions );
85 * Non virtual destructor. Not intended as base class.
87 ~CombinedUpdateRenderController();
90 * @copydoc ThreadControllerInterface::Initialize()
92 virtual void Initialize();
95 * @copydoc ThreadControllerInterface::Start()
100 * @copydoc ThreadControllerInterface::Pause()
102 virtual void Pause();
105 * @copydoc ThreadControllerInterface::Resume()
107 virtual void Resume();
110 * @copydoc ThreadControllerInterface::Stop()
115 * @copydoc ThreadControllerInterface::RequestUpdate()
117 virtual void RequestUpdate();
120 * @copydoc ThreadControllerInterface::RequestUpdateOnce()
122 virtual void RequestUpdateOnce();
125 * @copydoc ThreadControllerInterface::ReplaceSurface()
127 virtual void ReplaceSurface( Dali::RenderSurfaceInterface* surface );
130 * @copydoc ThreadControllerInterface::ResizeSurface()
132 virtual void ResizeSurface();
135 * @copydoc ThreadControllerInterface::SetRenderRefreshRate()
137 virtual void SetRenderRefreshRate( unsigned int numberOfFramesPerRender );
140 * @copydoc ThreadControllerInterface::SetPreRenderCallback
142 void SetPreRenderCallback( CallbackBase* callback ) override;
146 // Undefined copy constructor.
147 CombinedUpdateRenderController( const CombinedUpdateRenderController& );
149 // Undefined assignment operator.
150 CombinedUpdateRenderController& operator=( const CombinedUpdateRenderController& );
152 /////////////////////////////////////////////////////////////////////////////////////////////////
154 /////////////////////////////////////////////////////////////////////////////////////////////////
157 * Runs the Update/Render Thread.
158 * This will lock the mutex in mUpdateRenderThreadWaitCondition.
160 * @param[in] numberOfCycles The number of times the update/render cycle should run. If -1, then it will run continuously.
161 * @param[in] useElapsedTimeAfterWait If true, then the elapsed time during wait is used for animations, otherwise no animation progression is made.
163 inline void RunUpdateRenderThread( int numberOfCycles, bool useElapsedTimeAfterWait );
166 * Pauses the Update/Render Thread.
167 * This will lock the mutex in mUpdateRenderThreadWaitCondition.
169 inline void PauseUpdateRenderThread();
172 * Stops the Update/Render Thread.
173 * This will lock the mutex in mUpdateRenderThreadWaitCondition.
175 * @note Should only be called in Stop as calling this will kill the update-thread.
177 inline void StopUpdateRenderThread();
180 * Checks if the the Update/Render Thread is paused.
181 * This will lock the mutex in mUpdateRenderThreadWaitCondition.
183 * @return true if paused, false otherwise
185 inline bool IsUpdateRenderThreadPaused();
188 * Used as the callback for the sleep-trigger.
190 * Will sleep when enough requests are made without any requests.
192 void ProcessSleepRequest();
194 /////////////////////////////////////////////////////////////////////////////////////////////////
195 // UpdateRenderThread
196 /////////////////////////////////////////////////////////////////////////////////////////////////
199 * The Update/Render thread loop. This thread will be destroyed on exit from this function.
201 void UpdateRenderThread();
204 * Called by the Update/Render Thread which ensures a wait if required.
206 * @param[out] useElapsedTime If true when returned, then the actual elapsed time will be used for animation.
207 * If false when returned, then there should NOT be any animation progression in the next Update.
208 * @param[in] updateRequired Whether another update is required.
209 * @param[out] timeToSleepUntil The time remaining in nanoseconds to keep the thread sleeping before resuming.
210 * @return false, if the thread should stop.
212 bool UpdateRenderReady( bool& useElapsedTime, bool updateRequired, uint64_t& timeToSleepUntil );
215 * Checks to see if the surface needs to be replaced.
216 * This will lock the mutex in mUpdateRenderThreadWaitCondition.
218 * @return Pointer to the new surface, NULL otherwise
220 Integration::RenderSurface* ShouldSurfaceBeReplaced();
223 * Called by the Update/Render thread after a surface has been replaced.
225 * This will lock the mutex in mEventThreadWaitCondition
227 void SurfaceReplaced();
230 * Checks to see if the surface needs to be resized.
231 * This will lock the mutex in mUpdateRenderThreadWaitCondition.
233 * @return true if the surface should be resized, false otherwise
235 bool ShouldSurfaceBeResized();
238 * Called by the Update/Render thread after a surface has been resized.
240 * This will lock the mutex in mEventThreadWaitCondition
242 void SurfaceResized();
245 * Helper for the thread calling the entry function
246 * @param[in] This A pointer to the current object
248 static void* InternalUpdateRenderThreadEntryFunc( void* This )
250 ( static_cast<CombinedUpdateRenderController*>( This ) )->UpdateRenderThread();
254 /////////////////////////////////////////////////////////////////////////////////////////////////
256 /////////////////////////////////////////////////////////////////////////////////////////////////
259 * Called by the update-render & v-sync threads when they up and running.
261 * This will lock the mutex in mEventThreadWaitCondition.
263 void NotifyThreadInitialised();
266 * Helper to add a performance marker to the performance server (if it's active)
267 * @param[in] type performance marker type
269 void AddPerformanceMarker( PerformanceInterface::MarkerType type );
271 /////////////////////////////////////////////////////////////////////////////////////////////////
272 // POST RENDERING - ThreadSynchronizationInterface overrides
273 /////////////////////////////////////////////////////////////////////////////////////////////////
275 /////////////////////////////////////////////////////////////////////////////////////////////////
276 //// Called by the Event Thread if post-rendering is required
277 /////////////////////////////////////////////////////////////////////////////////////////////////
280 * @copydoc ThreadSynchronizationInterface::PostRenderComplete()
282 virtual void PostRenderComplete();
284 /////////////////////////////////////////////////////////////////////////////////////////////////
285 //// Called by the Render Thread if post-rendering is required
286 /////////////////////////////////////////////////////////////////////////////////////////////////
289 * @copydoc ThreadSynchronizationInterface::PostRenderStarted()
291 virtual void PostRenderStarted();
294 * @copydoc ThreadSynchronizationInterface::PostRenderStarted()
296 virtual void PostRenderWaitForCompletion();
300 FpsTracker mFpsTracker; ///< Object that tracks the FPS
301 UpdateStatusLogger mUpdateStatusLogger; ///< Object that logs the update-status as required.
303 sem_t mEventThreadSemaphore; ///< Used by the event thread to ensure all threads have been initialised, and when replacing the surface.
305 ConditionalWait mUpdateRenderThreadWaitCondition; ///< The wait condition for the update-render-thread.
307 AdaptorInternalServices& mAdaptorInterfaces; ///< The adaptor internal interface
308 PerformanceInterface* mPerformanceInterface; ///< The performance logging interface
309 Integration::Core& mCore; ///< Dali core reference
310 const EnvironmentOptions& mEnvironmentOptions; ///< Environment options
311 TriggerEventInterface& mNotificationTrigger; ///< Reference to notification event trigger
312 TriggerEventInterface* mSleepTrigger; ///< Used by the update-render thread to trigger the event thread when it no longer needs to do any updates
313 CallbackBase* mPreRenderCallback; ///< Used by Update/Render thread when PreRender is about to be called on graphics.
315 pthread_t* mUpdateRenderThread; ///< The Update/Render thread.
317 float mDefaultFrameDelta; ///< Default time delta between each frame (used for animations). Not protected by lock, but written to rarely so not worth adding a lock when reading.
318 // TODO: mDefaultFrameDurationMilliseconds is defined as uint64_t, the only place where it is used, it is converted to an unsigned int!!!
319 uint64_t mDefaultFrameDurationMilliseconds; ///< Default duration of a frame (used for predicting the time of the next frame). Not protected by lock, but written to rarely so not worth adding a lock when reading.
320 uint64_t mDefaultFrameDurationNanoseconds; ///< Default duration of a frame (used for sleeping if not enough time elapsed). Not protected by lock, but written to rarely so not worth adding a lock when reading.
321 uint64_t mDefaultHalfFrameNanoseconds; ///< Is half of mDefaultFrameDurationNanoseconds. Using a member variable avoids having to do the calculation every frame. Not protected by lock, but written to rarely so not worth adding a lock when reading.
323 unsigned int mUpdateRequestCount; ///< Count of update-requests we have received to ensure we do not go to sleep too early.
324 unsigned int mRunning; ///< Read and set on the event-thread only to state whether we are running.
327 // NOTE: cannot use booleans as these are used from multiple threads, must use variable with machine word size for atomic read/write
330 volatile int mUpdateRenderRunCount; ///< The number of times Update/Render cycle should run. If -1, then will run continuously (set by the event-thread, read by v-sync-thread).
331 volatile unsigned int mDestroyUpdateRenderThread; ///< Whether the Update/Render thread be destroyed (set by the event-thread, read by the update-render-thread).
332 volatile unsigned int mUpdateRenderThreadCanSleep; ///< Whether the Update/Render thread can sleep (set by the event-thread, read by the update-render-thread).
333 volatile unsigned int mPendingRequestUpdate; ///< Is set as soon as an RequestUpdate is made and unset when the next update happens (set by the event-thread and update-render thread, read by the update-render-thread).
334 ///< Ensures we do not go to sleep if we have not processed the most recent update-request.
336 volatile unsigned int mUseElapsedTimeAfterWait; ///< Whether we should use the elapsed time after waiting (set by the event-thread, read by the update-render-thread).
338 Integration::RenderSurface* volatile mNewSurface; ///< Will be set to the new-surface if requested (set by the event-thread, read & cleared by the update-render thread).
340 volatile unsigned int mPostRendering; ///< Whether post-rendering is taking place (set by the event & render threads, read by the render-thread).
341 volatile unsigned int mSurfaceResized; ///< Will be set to resize the surface (set by the event-thread, read & cleared by the update-render thread).
342 volatile unsigned int mForceClear; ///< Will be set to clear forcibly
345 } // namespace Adaptor
347 } // namespace Internal
351 #endif // DALI_INTERNAL_COMBINED_UPDATE_RENDER_CONTROLLER_H