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Improved timing accuracy of SDL_WaitEventTimeout() on Windows

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We don't need to use the hack of setting a timer and waiting for a timer message, MsgWaitForMultipleObjects() will allow us to wait for input directly with a timeout.

Before this change, sleeping for 20 ms would actually sleep for around 30 ms, with this change the sleep time is pretty accurate at 20-21 ms.

(cherry picked from commit 2670eb44af)
(cherry picked from commit 08caafe2f1)
This commit is contained in:
Sam Lantinga
2024-01-25 06:30:07 -08:00
parent 5c0b2d04f4
commit c85ea238ca
1 changed files with 1 additions and 22 deletions
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23
src/video/windows/SDL_windowsevents.c
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@@ -1802,29 +1802,8 @@ void SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback, void *userdata)
int WIN_WaitEventTimeout(_THIS, int timeout) int WIN_WaitEventTimeout(_THIS, int timeout)
{ {
MSG msg;
if (g_WindowsEnableMessageLoop) { if (g_WindowsEnableMessageLoop) {
BOOL message_result; if (MsgWaitForMultipleObjects(0, NULL, FALSE, (DWORD)timeout, QS_ALLINPUT)) {
UINT_PTR timer_id = 0;
if (timeout > 0) {
timer_id = SetTimer(NULL, 0, timeout, NULL);
message_result = GetMessage(&msg, 0, 0, 0);
KillTimer(NULL, timer_id);
} else if (timeout == 0) {
message_result = PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
} else {
message_result = GetMessage(&msg, 0, 0, 0);
}
if (message_result) {
if (msg.message == WM_TIMER && !msg.hwnd && msg.wParam == timer_id) {
return 0;
}
if (g_WindowsMessageHook) {
g_WindowsMessageHook(g_WindowsMessageHookData, msg.hwnd, msg.message, msg.wParam, msg.lParam);
}
/* Always translate the message in case it's a non-SDL window (e.g. with Qt integration) */
TranslateMessage(&msg);
DispatchMessage(&msg);
return 1; return 1;
} else { } else {
return 0; return 0;