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#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include <math.h>
#include "frame_skip.h"
#include "memmap.h"
#ifndef uclock_t
#define uclock_t unsigned int
#endif
#define TICKS_PER_SEC 1000000UL
//#define CPU_FPS 60
static int CPU_FPS=60;
static uclock_t F;
#define MAX_FRAMESKIP 10
static char init_frame_skip = 1;
char skip_next_frame = 0;
static struct timeval init_tv = { 0, 0 };
void reset_frame_skip(void)
{
//static Uint8 init=0;
init_tv.tv_usec = 0;
init_tv.tv_sec = 0;
skip_next_frame = 0;
init_frame_skip = 1;
CPU_FPS=Memory.ROMFramesPerSecond;
F = (uclock_t) ((double) TICKS_PER_SEC / CPU_FPS);
}
uclock_t get_ticks(void)
{
struct timeval tv;
gettimeofday(&tv, 0);
if (init_tv.tv_sec == 0)
init_tv = tv;
return (tv.tv_sec - init_tv.tv_sec) * TICKS_PER_SEC + tv.tv_usec -
init_tv.tv_usec;
}
int frame_skip(void)
{
static int f2skip;
static uclock_t sec = 0;
static uclock_t rfd;
static uclock_t target;
static int nbFrame = 0;
static int skpFrm = 0;
if (init_frame_skip) {
init_frame_skip = 0;
target = get_ticks();
nbFrame = 0;
//f2skip=0;
//skpFrm=0;
sec = 0;
return 0;
}
target += F;
if (f2skip > 0) {
f2skip--;
skpFrm++;
return 1;
} else
skpFrm = 0;
rfd = get_ticks();
if (rfd < target && f2skip == 0) {
while (get_ticks() < target);
} else {
f2skip = (rfd - target) / (double) F;
if (f2skip > MAX_FRAMESKIP) {
f2skip = MAX_FRAMESKIP;
reset_frame_skip();
}
// printf("Skip %d frame(s) %lu %lu\n",f2skip,target,rfd);
}
nbFrame++;
if (get_ticks() - sec >= TICKS_PER_SEC) {
nbFrame = 0;
sec = get_ticks();
}
return 0;
}
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