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video: wayland: Support displays with a 0 refresh rate 

Some wayland compositors report the refresh rate as 0. Since we want to
force a minimum refresh rate of 10 frames worth, we were dividing by the
reported refresh rate, causing a divide-by-zero.

If the refresh rate is 0, instead force a frame every second if no frame
callbacks are received.

This fixes bug #4785
This commit is contained in:
David Gow 2021-09-27 16:57:09 +08:00 committed by Ethan Lee
parent ba87876ef7
commit 35d045584d
1 changed files with 3 additions and 1 deletions
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4
src/video/wayland/SDL_waylandopengles.c
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@ -129,7 +129,9 @@ Wayland_GLES_SwapWindow(_THIS, SDL_Window *window)
if (swap_interval != 0) {
struct wl_display *display = ((SDL_VideoData *)_this->driverdata)->display;
SDL_VideoDisplay *sdldisplay = SDL_GetDisplayForWindow(window);
const Uint32 max_wait = SDL_GetTicks() + (10000 / sdldisplay->current_mode.refresh_rate); /* ~10 frames, so we'll progress even if throttled to zero. */
/* ~10 frames (or 1 sec), so we'll progress even if throttled to zero. */
const Uint32 max_wait = SDL_GetTicks() + (sdldisplay->current_mode.refresh_rate ?
(10000 / sdldisplay->current_mode.refresh_rate) : 1000);
while (SDL_AtomicGet(&data->swap_interval_ready) == 0) {
Uint32 now;