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Code Issues Releases Wiki Activity

roll back to using SDL_Delay/SDL_GetTicks

This commit is contained in:
fgsfds 2020-07-08 12:51:15 +03:00
parent fde15809b7
commit 92e869d263
1 changed files with 8 additions and 13 deletions
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21
src/pc/gfx/gfx_sdl2.c
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@ -52,8 +52,8 @@ static void (*kb_all_keys_up)(void) = NULL;
// whether to use timer for frame control // whether to use timer for frame control
static bool use_timer = true; static bool use_timer = true;
static Uint64 qpc_freq = 1; // time between consequtive game frames
static Uint64 frame_time = 1; static const Uint32 frame_time = 1000 / FRAMERATE;
const SDL_Scancode windows_scancode_table[] = { const SDL_Scancode windows_scancode_table[] = {
/* 0 1 2 3 4 5 6 7 */ /* 0 1 2 3 4 5 6 7 */
@ -148,8 +148,8 @@ static inline void gfx_sdl_set_vsync(int mode) {
use_timer = false; use_timer = false;
return; return;
} else { } else {
printf("could not determine swap interval, falling back to timer sync\n"); printf("could not determine swap interval, falling back to one vblank + timer sync\n");
mode = 0; mode = 1;
} }
} }
@ -224,9 +224,6 @@ static void gfx_sdl_init(const char *window_title) {
gfx_sdl_set_fullscreen(); gfx_sdl_set_fullscreen();
qpc_freq = SDL_GetPerformanceFrequency();
frame_time = qpc_freq / FRAMERATE;
for (size_t i = 0; i < sizeof(windows_scancode_table) / sizeof(SDL_Scancode); i++) { for (size_t i = 0; i < sizeof(windows_scancode_table) / sizeof(SDL_Scancode); i++) {
inverted_scancode_table[windows_scancode_table[i]] = i; inverted_scancode_table[windows_scancode_table[i]] = i;
} }
@ -242,13 +239,11 @@ static void gfx_sdl_init(const char *window_title) {
} }
static void gfx_sdl_main_loop(void (*run_one_game_iter)(void)) { static void gfx_sdl_main_loop(void (*run_one_game_iter)(void)) {
Uint64 t = SDL_GetPerformanceCounter(); Uint32 t = SDL_GetTicks();
run_one_game_iter(); run_one_game_iter();
t = SDL_GetPerformanceCounter() - t; t = SDL_GetTicks() - t;
if (t < frame_time && use_timer) { if (t < frame_time && use_timer)
const Uint64 us = (frame_time - t) * 1000000 / qpc_freq; SDL_Delay(frame_time - t);
usleep(us);
}
} }
static void gfx_sdl_get_dimensions(uint32_t *width, uint32_t *height) { static void gfx_sdl_get_dimensions(uint32_t *width, uint32_t *height) {