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app/retro_frontend: fix FPS sampling math

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Fix #54
This commit is contained in:
Emery Hemingway
2016-12-11 13:05:51 +01:00
committed by Norman Feske
parent bcda357a1e
commit c2e321d296
1 changed files with 5 additions and 4 deletions
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9
src/app/retro_frontend/frontend.h
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@@ -346,11 +346,12 @@ struct Libretro::Frontend
} else if (fb_sync_sample_count == quarter_fps) {
fb_sync_sample_count = 0;
int sync_ms = (timer.elapsed_ms() - sample_start)/quarter_fps;
int want_ms = 250.0 / quarter_fps;
float sync_ms = (timer.elapsed_ms() - sample_start)/quarter_fps;
float want_ms = 250.0 / quarter_fps;
float diff = want_ms - sync_ms;
int diff = want_ms - sync_ms;
if (diff > 10 || diff < -10) {
/* allow a generous two millisecond difference in FPS */
if (diff > 2.0 || diff < -2.0) {
framebuffer->session.sync_sigh(Genode::Signal_context_capability());
Genode::warning("framebuffer sync unsuitable, "
"using alternative timing source");