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only wait for vsync if under frame budget

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This commit is contained in:
Shaun Inman 2023-01-13 20:12:47 -05:00
parent 1143e46d20
commit d8c96b82fa
4 changed files with 20 additions and 11 deletions
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18
src/common/api.c
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@ -192,18 +192,22 @@ void GFX_clearAll(void) {
memset(gfx.map, 0, gfx.map_size);
}
static int frame_start = 0;
void GFX_startFrame(void) {
frame_start = SDL_GetTicks();
}
void GFX_flip(SDL_Surface* screen) {
static int ticks = 0;
ticks += 1;
#ifdef GFX_ENABLE_VSYNC
int arg = 1;
ioctl(gfx.fb, OWLFB_WAITFORVSYNC, &arg); // TODO: this doesn't wait but it also doesn't error out like FBIO_WAITFORVSYNC...
#define FRAME_BUDGET 17 // 60fps
if (frame_start==0 || SDL_GetTicks()-frame_start<FRAME_BUDGET) { // only wait if we're under frame budget
int arg = 1;
ioctl(gfx.fb, OWLFB_WAITFORVSYNC, &arg);
}
#endif
#ifdef GFX_ENABLE_BUFFER
// TODO: this would be moved to a thread
// I'm not clear on why that would be necessary
// if it's non-blocking and the pan will wait
// until the next vblank...
// what if the scaling was also moved to a thread?
gfx.vinfo.yoffset = gfx.buffer * SCREEN_HEIGHT;
ioctl(gfx.fb, FBIOPAN_DISPLAY, &gfx.vinfo);