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