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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef QDENGINE_QDCORE_UTIL_SYNCRO_TIMER
#define QDENGINE_QDCORE_UTIL_SYNCRO_TIMER
#include "common/system.h"
typedef uint32 time_type;
namespace QDEngine {
class SyncroTimer {
public:
// Main property
time_type operator()() const {
return round(_time);
}
// Last delta
time_type delta() const {
return _time - _time_prev;
}
SyncroTimer() {
set(1, 15, 100);
_time_prev = _time = 1;
_time_offset = 0;
_time_speed = 1;
}
void set(int syncro_by_clock, time_type time_per_frame, time_type max_time_interval) {
_syncro_by_clock = syncro_by_clock;
_time_per_frame = time_per_frame;
_max_time_interval = max_time_interval;
}
SyncroTimer &adjust() {
_time_prev = _time;
if (_syncro_by_clock) {
float t = float(g_system->getMillis());
float dt = (t - _time - _time_offset) * _time_speed;
if (dt > _max_time_interval)
dt = _max_time_interval;
_time += dt;
_time_offset = t - _time;
}
return *this;
}
void next_frame() {
if (_syncro_by_clock)
adjust();
else {
_time_prev = _time;
_time += _time_per_frame * _time_speed;
// _time += round(_time_per_frame*_time_speed);
}
}
void skip() {
if (_syncro_by_clock)
_time_offset = g_system->getMillis() - _time;
}
void setTime(time_type t) {
_time_prev = _time = t;
_time_offset = _syncro_by_clock ? g_system->getMillis() - _time : 0;
}
void setSpeed(float speed) {
_time_speed = speed;
}
private:
float _time;
float _time_prev;
float _time_offset;
time_type _max_time_interval;
time_type _time_per_frame;
int _syncro_by_clock;
float _time_speed;
};
} // namespace QDEngine
#endif // QDENGINE_QDCORE_UTIL_SYNCRO_TIMER
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