diff --git a/src/render/SDL_render.c b/src/render/SDL_render.c index aa6bd402f..aaf2e85b2 100644 --- a/src/render/SDL_render.c +++ b/src/render/SDL_render.c @@ -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 */ diff --git a/src/render/SDL_sysrender.h b/src/render/SDL_sysrender.h index 6deb5b2ee..86d5eaa64 100644 --- a/src/render/SDL_sysrender.h +++ b/src/render/SDL_sysrender.h @@ -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 */