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Code Issues Releases Wiki Activity

time whole frame instead of just the rendering part

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thanks to opmox for the fix
This commit is contained in:
fgsfds 2021-11-26 03:12:32 +03:00
parent 137ee29bdc
commit b5f50dd975
1 changed files with 7 additions and 2 deletions
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9
src/pc/gfx/gfx_sdl2.c
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@ -187,6 +187,7 @@ static void gfx_sdl_init(const char *window_title) {
perf_freq = SDL_GetPerformanceFrequency();
frame_rate = perf_freq / FRAMERATE;
frame_time = SDL_GetPerformanceCounter();
for (size_t i = 0; i < sizeof(windows_scancode_table) / sizeof(SDL_Scancode); i++) {
inverted_scancode_table[windows_scancode_table[i]] = i;
@ -287,19 +288,23 @@ static void gfx_sdl_set_keyboard_callbacks(kb_callback_t on_key_down, kb_callbac
}
static bool gfx_sdl_start_frame(void) {
frame_time = SDL_GetPerformanceCounter();
return true;
}
static inline void sync_framerate_with_timer(void) {
// calculate how long it took for the frame to render
const double frame_length = SDL_GetPerformanceCounter() - frame_time;
const double now = SDL_GetPerformanceCounter();
const double frame_length = now - frame_time;
if (frame_length < frame_rate) {
// Only sleep if we have time to spare
const double remain = frame_rate - frame_length;
// Sleep remaining time away
sys_sleep(remain / perf_freq * 1000000.0);
// Assume we slept the required amount of time to keep the timer stable
frame_time = now + remain;
} else {
frame_time = now;
}
}