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void DisplayLinkDirector::mainLoop() { if (_purgeDirectorInNextLoop) { _purgeDirectorInNextLoop = false; purgeDirector(); } else if (! _invalid) { drawScene(); // release the objects //釋放資源對象 PoolManager::getInstance()->getCurrentPool()->clear(); } }void Director::drawScene() { // calculate "global" dt //計算全局幀間時間差 dt calculateDeltaTime(); // skip one flame when _deltaTime equal to zero. if(_deltaTime < FLT_EPSILON) { return; } if (_openGLView) { _openGLView->pollInputEvents(); } //tick before glClear: issue #533 if (! _paused) { _scheduler->update(_deltaTime); _eventDispatcher->dispatchEvent(_eventAfterUpdate); } glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); /* to avoid flickr, nextScene MUST be here: after tick and before draw. XXX: Which bug is this one. It seems that it can't be reproduced with v0.9 */ if (_nextScene) { setNextScene(); } kmGLPushMatrix(); // global identity matrix is needed... come on kazmath! kmMat4 identity; kmMat4Identity(&identity); // draw the scene //繪制場景 if (_runningScene) { _runningScene->visit(_renderer, identity, false); _eventDispatcher->dispatchEvent(_eventAfterVisit); } // draw the notifications node //處理通知節點 if (_notificationNode) { _notificationNode->visit(_renderer, identity, false); } if (_displayStats) { showStats(); } _renderer->render(); _eventDispatcher->dispatchEvent(_eventAfterDraw); kmGLPopMatrix(); _totalFrames++; // swap buffers //交換緩沖區 if (_openGLView) { _openGLView->swapBuffers(); } if (_displayStats) { calculateMPF(); } }void Node::scheduleUpdateWithPriority(int priority) { _scheduler->scheduleUpdate(this, priority, !_running); } void Node::schedule(SEL_SCHEDULE selector, float interval, unsigned int repeat, float delay) { CCASSERT( selector, "Argument must be non-nil"); CCASSERT( interval >=0, "Argument must be positive"); _scheduler->schedule(selector, this, interval , repeat, delay, !_running); }// main loop void Scheduler::update(float dt) { _updateHashLocked = true; //a.預處理 if (_timeScale != 1.0f) { dt *= _timeScale; } // // Selector callbacks // // Iterate over all the Updates' selectors //b.枚舉所有的 update 定時器 tListEntry *entry, *tmp; // updates with priority < 0 //優先級小于 0 的定時器 DL_FOREACH_SAFE(_updatesNegList, entry, tmp) { if ((! entry->paused) && (! entry->markedForDeletion)) { entry->callback(dt); } } // updates with priority == 0 //優先級等于 0 的定時器 DL_FOREACH_SAFE(_updates0List, entry, tmp) { if ((! entry->paused) && (! entry->markedForDeletion)) { entry->callback(dt); } } // updates with priority > 0 //優先級大于 0 的定時器 DL_FOREACH_SAFE(_updatesPosList, entry, tmp) { if ((! entry->paused) && (! entry->markedForDeletion)) { entry->callback(dt); } } // Iterate over all the custom selectors //c.枚舉所有的普通定時器 for (tHashTimerEntry *elt = _hashForTimers; elt != nullptr; ) { _currentTarget = elt; _currentTargetSalvaged = false; if (! _currentTarget->paused) { // The 'timers' array may change while inside this loop //枚舉此節點中的所有定時器 //timers 數組可能在循環中改變，因此在此處需要小心處理 for (elt->timerIndex = 0; elt->timerIndex < elt->timers->num; ++(elt->timerIndex)) { elt->currentTimer = (Timer*)(elt->timers->arr[elt->timerIndex]); elt->currentTimerSalvaged = false; elt->currentTimer->update(dt); if (elt->currentTimerSalvaged) { // The currentTimer told the remove itself. To prevent the timer from // accidentally deallocating itself before finishing its step, we retained // it. Now that step is done, it's safe to release it. elt->currentTimer->release(); } elt->currentTimer = nullptr; } } // elt, at this moment, is still valid // so it is safe to ask this here (issue #490) elt = (tHashTimerEntry *)elt->hh.next; // only delete currentTarget if no actions were scheduled during the cycle (issue #481) if (_currentTargetSalvaged && _currentTarget->timers->num == 0) { removeHashElement(_currentTarget); } } // delete all updates that are marked for deletion // updates with priority < 0 //d.清理所有被標記了刪除記號的 update 方法 //優先級小于 0 的定時器 DL_FOREACH_SAFE(_updatesNegList, entry, tmp) { if (entry->markedForDeletion) { this->removeUpdateFromHash(entry); } } // updates with priority == 0 //優先級等于 0 的定時器 DL_FOREACH_SAFE(_updates0List, entry, tmp) { if (entry->markedForDeletion) { this->removeUpdateFromHash(entry); } } // updates with priority > 0 //優先級大于 0 的定時器 DL_FOREACH_SAFE(_updatesPosList, entry, tmp) { if (entry->markedForDeletion) { this->removeUpdateFromHash(entry); } } _updateHashLocked = false; _currentTarget = nullptr; #if CC_ENABLE_SCRIPT_BINDING // // Script callbacks // // Iterate over all the script callbacks //e.處理腳本引擎相關的事件 if (!_scriptHandlerEntries.empty()) { for (auto i = _scriptHandlerEntries.size() - 1; i >= 0; i--) { SchedulerScriptHandlerEntry* eachEntry = _scriptHandlerEntries.at(i); if (eachEntry->isMarkedForDeletion()) { _scriptHandlerEntries.erase(i); } else if (!eachEntry->isPaused()) { eachEntry->getTimer()->update(dt); } } } #endif // // Functions allocated from another thread // // Testing size is faster than locking / unlocking. // And almost never there will be functions scheduled to be called. if( !_functionsToPerform.empty() ) { _performMutex.lock(); // fixed #4123: Save the callback functions, they must be invoked after '_performMutex.unlock()', otherwise if new functions are added in callback, it will cause thread deadlock. auto temp = _functionsToPerform; _functionsToPerform.clear(); _performMutex.unlock(); for( const auto &function : temp ) { function(); } } }void Timer::update(float dt) { if (_elapsed == -1) { _elapsed = 0; _timesExecuted = 0; } else { if (_runForever && !_useDelay) {//standard timer usage _elapsed += dt; if (_elapsed >= _interval) { trigger(); _elapsed = 0; } } else {//advanced usage _elapsed += dt; if (_useDelay) { if( _elapsed >= _delay ) { trigger(); _elapsed = _elapsed - _delay; _timesExecuted += 1; _useDelay = false; } } else { if (_elapsed >= _interval) { trigger(); _elapsed = 0; _timesExecuted += 1; } } if (!_runForever && _timesExecuted > _repeat) { //unschedule timer cancel(); } } } }
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