60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
/* libsegl - Sebas Extended GL Library
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* Collection of Opengl/3D-Math helpers
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*
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* Copyright (c) 2008 by Sebastian Lohff, seba@seba-geek.de
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* http://www.seba-geek.de
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "fpsmanager.h"
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namespace segl {
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FPSManager::FPSManager(int _fps) {
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setFPS(_fps);
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frames = 0;
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framerate = 0;
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lastticks = SDL_GetTicks();
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}
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void FPSManager::setFPS(int _fps) {
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if(_fps<1 || _fps > 500)
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return;
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tickrate = 1000.0f/(float)_fps;
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}
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void FPSManager::delay() {
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frames++;
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Uint32 now = SDL_GetTicks();
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Uint32 target = lastticks + (Uint32)(tickrate * (float)frames);
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if(now <= target) {
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SDL_Delay(target-now);
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} else {
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framerate = frames/((now-lastticks)/1000.0f);
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frames = 0;
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lastticks = SDL_GetTicks();
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}
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}
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float FPSManager::getFPS() {
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return framerate;
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}
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} // namespace segl
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