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72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "graphics/framelimiter.h"
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#include "common/util.h"
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namespace Graphics {
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FrameLimiter::FrameLimiter(OSystem *system, const uint framerate) :
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_system(system),
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_speedLimitMs(0),
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_startFrameTime(0),
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_lastFrameDurationMs(_speedLimitMs) {
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// The frame limiter is disabled when vsync is enabled.
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_enabled = !_system->getFeatureState(OSystem::kFeatureVSync) && framerate != 0;
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if (_enabled) {
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_speedLimitMs = 1000 / CLIP<uint>(framerate, 0, 100);
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}
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}
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void FrameLimiter::startFrame() {
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uint currentTime = _system->getMillis();
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if (_startFrameTime != 0) {
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_lastFrameDurationMs = currentTime - _startFrameTime;
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}
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_startFrameTime = currentTime;
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}
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void FrameLimiter::delayBeforeSwap() {
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uint endFrameTime = _system->getMillis();
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uint frameDuration = endFrameTime - _startFrameTime;
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if (_enabled && frameDuration < _speedLimitMs) {
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_system->delayMillis(_speedLimitMs - frameDuration);
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}
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}
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void FrameLimiter::pause(bool pause) {
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if (!pause) {
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// Make sure the frame duration value is consistent when resuming
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_startFrameTime = 0;
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}
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}
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uint FrameLimiter::getLastFrameDuration() const {
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return _lastFrameDurationMs;
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}
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} // End of namespace Graphics
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