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perfect vsync

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@218 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-08-08 19:49:11 +00:00
parent 0ae6813e48
commit 59d0f042a1
4 changed files with 64 additions and 32 deletions
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40
gp2x/emu.c
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@ -1063,11 +1063,11 @@ static void simpleWait(int thissec, int lim_time)
void emu_Loop(void)
{
static int gp2x_old_clock = 200;
static int PsndRate_old = 0, PicoOpt_old = 0, PsndLen_real = 0, pal_old = 0;
static int PsndRate_old = 0, PicoOpt_old = 0, EmuOpt_old = 0, PsndLen_real = 0, pal_old = 0;
char fpsbuff[24]; // fps count c string
struct timeval tval; // timing
int thissec = 0, frames_done = 0, frames_shown = 0, oldmodes = 0;
int target_fps, target_frametime, lim_time, i;
int target_fps, target_frametime, lim_time, vsync_offset, i;
char *notice = 0;
printf("entered emu_Loop()\n");
@ -1085,6 +1085,13 @@ void emu_Loop(void)
printf("updated gamma to %i\n", currentConfig.gamma);
}
if ((EmuOpt_old&0x2000) != (currentConfig.EmuOpt&0x2000)) {
if (currentConfig.EmuOpt&0x2000)
set_LCD_custom_rate(Pico.m.pal ? LCDR_100 : LCDR_120);
else unset_LCD_custom_rate();
}
EmuOpt_old = currentConfig.EmuOpt;
fpsbuff[0] = 0;
// make sure we are in correct mode
@ -1128,6 +1135,19 @@ void emu_Loop(void)
// prepare CD buffer
if (PicoMCD & 1) PicoCDBufferInit();
// calc vsync offset to sync timing code with vsync
if (currentConfig.EmuOpt&0x2000) {
gettimeofday(&tval, 0);
gp2x_video_wait_vsync();
gettimeofday(&tval, 0);
vsync_offset = tval.tv_usec;
while (vsync_offset >= target_frametime)
vsync_offset -= target_frametime;
if (!vsync_offset) vsync_offset++;
printf("vsync_offset: %i\n", vsync_offset);
} else
vsync_offset = 0;
// loop?
while (engineState == PGS_Running)
{
@ -1210,10 +1230,8 @@ void emu_Loop(void)
if (frames_shown > frames_done) frames_shown = frames_done;
}
}
#if 0
sprintf(fpsbuff, "%05i", Pico.m.frame_count);
#endif
lim_time = (frames_done+1) * target_frametime;
lim_time = (frames_done+1) * target_frametime + vsync_offset;
if(currentConfig.Frameskip >= 0) { // frameskip enabled
for(i = 0; i < currentConfig.Frameskip; i++) {
updateKeys();
@ -1309,12 +1327,18 @@ if (Pico.m.frame_count == 31563) {
reset_timing = 1;
else if (PsndOut != NULL || currentConfig.Frameskip < 0)
{
// sleep if we are still too fast
// sleep or vsync if we are still too fast
// usleep sleeps for ~20ms minimum, so it is not a solution here
if(tval.tv_usec < lim_time)
{
// we are too fast
simpleWait(thissec, lim_time);
if (vsync_offset) {
if (lim_time - tval.tv_usec > target_frametime/2)
simpleWait(thissec, lim_time - target_frametime/4);
gp2x_video_wait_vsync();
} else {
simpleWait(thissec, lim_time);
}
}
}