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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/>.
*
*/
#include "common/system.h"
#include "qdengine/qdcore/util/fps_counter.h"
namespace QDEngine {
fpsCounter::fpsCounter(int period) : _start_time(0.0f),
_prev_time(0.0f),
_period(period),
_frame_count(0),
_value(-1.0f),
_value_min(0.0f),
_value_max(0.0f),
_min_frame_time(1000.0f),
_max_frame_time(0.0f) {
}
bool fpsCounter::quant() {
float time = float(g_system->getMillis());
if (_min_frame_time > time - _prev_time)
_min_frame_time = time - _prev_time;
if (_max_frame_time < time - _prev_time)
_max_frame_time = time - _prev_time;
_frame_count++;
_prev_time = time;
if (_period) {
if (_prev_time - _start_time >= _period) {
_value = float(_frame_count) / (_prev_time - _start_time) * 1000.0f;
_value_min = 1000.0f / _max_frame_time;
_value_max = 1000.0f / _min_frame_time;
_frame_count = 0;
_start_time = _prev_time;
_min_frame_time = 10000.0f;
_max_frame_time = 0.0f;
return true;
}
return false;
} else {
_value = float(_frame_count) / (float(g_system->getMillis()) - _start_time) * 1000.0f;
return true;
}
}
void fpsCounter::reset() {
_prev_time = _start_time = float(g_system->getMillis());
_frame_count = 0;
_value = -1.0f;
_value_min = _value_max = 0.0f;
_min_frame_time = 10000.0f;
_max_frame_time = 0.0f;
}
} // namespace QDEngine
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