106 lines
2.5 KiB
C++
106 lines
2.5 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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#ifndef QDENGINE_QDCORE_UTIL_SYNCRO_TIMER
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#define QDENGINE_QDCORE_UTIL_SYNCRO_TIMER
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#include "common/system.h"
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typedef uint32 time_type;
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namespace QDEngine {
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class SyncroTimer {
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public:
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// Main property
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time_type operator()() const {
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return round(_time);
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}
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// Last delta
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time_type delta() const {
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return _time - _time_prev;
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}
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SyncroTimer() {
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set(1, 15, 100);
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_time_prev = _time = 1;
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_time_offset = 0;
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_time_speed = 1;
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}
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void set(int syncro_by_clock, time_type time_per_frame, time_type max_time_interval) {
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_syncro_by_clock = syncro_by_clock;
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_time_per_frame = time_per_frame;
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_max_time_interval = max_time_interval;
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}
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SyncroTimer &adjust() {
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_time_prev = _time;
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if (_syncro_by_clock) {
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float t = float(g_system->getMillis());
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float dt = (t - _time - _time_offset) * _time_speed;
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if (dt > _max_time_interval)
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dt = _max_time_interval;
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_time += dt;
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_time_offset = t - _time;
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}
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return *this;
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}
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void next_frame() {
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if (_syncro_by_clock)
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adjust();
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else {
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_time_prev = _time;
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_time += _time_per_frame * _time_speed;
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// _time += round(_time_per_frame*_time_speed);
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}
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}
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void skip() {
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if (_syncro_by_clock)
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_time_offset = g_system->getMillis() - _time;
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}
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void setTime(time_type t) {
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_time_prev = _time = t;
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_time_offset = _syncro_by_clock ? g_system->getMillis() - _time : 0;
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}
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void setSpeed(float speed) {
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_time_speed = speed;
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}
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private:
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float _time;
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float _time_prev;
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float _time_offset;
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time_type _max_time_interval;
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time_type _time_per_frame;
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int _syncro_by_clock;
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float _time_speed;
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};
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} // namespace QDEngine
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#endif // QDENGINE_QDCORE_UTIL_SYNCRO_TIMER
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