void calculate_speed(void* dst, u32 len, u32 *speed)
{
tb_t start, end;
mftb(&start);
device_frag_read(dst, len, 0);
mftb(&end);
*speed = tb_diff_usec(&end, &start);
}
void S9xSyncSpeed ()
{
#if 0
unsigned int timediffallowed = Settings.TurboMode ? 0 : Settings.FrameTime;
while (!S9xSyncSound())
usleep(10);
uint32 skipFrms = Settings.SkipFrames;
if (Settings.TurboMode)
skipFrms = Settings.TurboSkipFrames;
now = gettime();
if (tb_diff_usec(now,prev) > timediffallowed)
{
/* Timer has already expired */
if (IPPU.SkippedFrames < skipFrms)
{
IPPU.SkippedFrames++;
IPPU.RenderThisFrame = FALSE;
}
else
{
IPPU.SkippedFrames = 0;
IPPU.RenderThisFrame = TRUE;
}
}
else
{
/*** Ahead - so hold up ***/
while (tb_diff_usec(now,prev) < timediffallowed)
{
now = gettime();
usleep(50);
}
IPPU.RenderThisFrame = TRUE;
IPPU.SkippedFrames = 0;
}
prev = now;
#endif
return;
}
u32 _diff_usec(u64 start,u64 end){
return tb_diff_usec(uint64_t (end), uint64_t (start));
}