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/*
* Copyright (C) 2010 Benoit Gschwind
* Inspired by original author : Pete Bernert
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <unistd.h>
#include <sys/time.h>
#include "globals.h"
#include "fps.h"
#include "gpu.h"
#define TIMEBASE 100000
unsigned long time_get_time() {
struct timeval tv;
gettimeofday(&tv, 0); // well, maybe there are better ways
return tv.tv_sec * 100000 + tv.tv_usec / 10; // to do that, but at least it works
}
void frame_cap(int fps) {
static unsigned int last_time = 0;
unsigned int c = time_get_time();
if (!fps) {
last_time = c;
return;
}
if (last_time + (100000/fps) < c) {
last_time = c;
return;
}
while (last_time + (100000/fps) - 20 > c) {
usleep(((100000/fps) - 20 - (c - last_time)) * 10 );
c = time_get_time();
}
last_time = c;
}
void compute_fps() {
static int count = 0;
static unsigned int last_time = 0;
unsigned int c = time_get_time();
++count;
if((c - last_time) > 100000) {
g_draw.fps = ((double)count) / ((double)(c - last_time)) * 100000;
count = 0;
last_time = c;
}
}
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