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Convert ticks to 64-bit, added nanosecond precision to the API

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Fixes https://github.com/libsdl-org/SDL/issues/5512
Fixes https://github.com/libsdl-org/SDL/issues/6731
This commit is contained in:
Sam Lantinga
2022-12-02 01:17:17 -08:00
parent 764b899a13
commit 8121bbd083
96 changed files with 938 additions and 1243 deletions
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18
src/render/SDL_render.c
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@@ -921,7 +921,7 @@ static void SDL_CalculateSimulatedVSyncInterval(SDL_Renderer *renderer, SDL_Wind
/* Pick a good default refresh rate */
refresh_rate = 60;
}
renderer->simulate_vsync_interval = (1000 / refresh_rate);
renderer->simulate_vsync_interval_ns = (SDL_NS_PER_SECOND / refresh_rate);
}
#endif /* !SDL_RENDER_DISABLED */
@@ -4188,24 +4188,24 @@ int SDL_RenderReadPixels(SDL_Renderer *renderer, const SDL_Rect *rect,
static void SDL_RenderSimulateVSync(SDL_Renderer *renderer)
{
Uint32 now, elapsed;
const Uint32 interval = renderer->simulate_vsync_interval;
Uint64 now, elapsed;
const Uint64 interval = renderer->simulate_vsync_interval_ns;
if (!interval) {
/* We can't do sub-ms delay, so just return here */
/* We can't do sub-ns delay, so just return here */
return;
}
now = SDL_GetTicks();
now = SDL_GetTicksNS();
elapsed = (now - renderer->last_present);
if (elapsed < interval) {
Uint32 duration = (interval - elapsed);
SDL_Delay(duration);
now = SDL_GetTicks();
Uint64 duration = (interval - elapsed);
SDL_DelayNS(duration);
now = SDL_GetTicksNS();
}
elapsed = (now - renderer->last_present);
if (!renderer->last_present || elapsed > 1000) {
if (!renderer->last_present || elapsed > SDL_NS_TO_MS(1000)) {
/* It's been too long, reset the presentation timeline */
renderer->last_present = now;
} else {

4
src/render/SDL_sysrender.h
View File

@@ -209,8 +209,8 @@ struct SDL_Renderer
/* Whether we should simulate vsync */
SDL_bool wanted_vsync;
SDL_bool simulate_vsync;
Uint32 simulate_vsync_interval;
Uint32 last_present;
Uint64 simulate_vsync_interval_ns;
Uint64 last_present;
/* The logical resolution for rendering */
int logical_w;