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Calculate simulated vsync interval based on display refresh rate

main
Sam Lantinga 2022-09-15 08:02:14 -07:00
parent 208964f038
commit e2753e19e8
2 changed files with 23 additions and 1 deletions
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23
src/render/SDL_render.c
View File

@ -933,6 +933,26 @@ static SDL_RenderLineMethod SDL_GetRenderLineMethod()
}
}
static void SDL_CalculateSimulatedVSyncInterval(SDL_Renderer *renderer, SDL_Window *window)
{
/* FIXME: SDL refresh rate API should return numerator/denominator */
int refresh_rate = 0;
int display_index = SDL_GetWindowDisplayIndex(window);
SDL_DisplayMode mode;
if (display_index < 0) {
display_index = 0;
}
if (SDL_GetDesktopDisplayMode(display_index, &mode) == 0) {
refresh_rate = mode.refresh_rate;
}
if (!refresh_rate) {
/* Pick a good default refresh rate */
refresh_rate = 60;
}
renderer->simulate_vsync_interval = (1000 / refresh_rate);
}
SDL_Renderer *
SDL_CreateRenderer(SDL_Window * window, int index, Uint32 flags)
{
@ -1022,6 +1042,7 @@ SDL_CreateRenderer(SDL_Window * window, int index, Uint32 flags)
renderer->info.flags |= SDL_RENDERER_PRESENTVSYNC;
}
}
SDL_CalculateSimulatedVSyncInterval(renderer, window);
VerifyDrawQueueFunctions(renderer);
@ -4273,7 +4294,7 @@ static void
SDL_RenderSimulateVSync(SDL_Renderer * renderer)
{
Uint32 now, elapsed;
const Uint32 interval = (1000 / 60); /* FIXME: What FPS? */
const Uint32 interval = renderer->simulate_vsync_interval;
if (!interval) {
/* We can't do sub-ms delay, so just return here */

1
src/render/SDL_sysrender.h
View File

@ -211,6 +211,7 @@ struct SDL_Renderer
/* Whether we should simulate vsync */
SDL_bool wanted_vsync;
SDL_bool simulate_vsync;
Uint32 simulate_vsync_interval;
Uint32 last_present;
/* The logical resolution for rendering */