From 2670eb44afec9311ee8fbec447703c427db1e1c8 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Thu, 25 Jan 2024 06:30:07 -0800
Subject: [PATCH] Improved timing accuracy of SDL_WaitEventTimeout() on Windows

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.
---
 src/video/windows/SDL_windowsevents.c | 25 +------------------------
 1 file changed, 1 insertion(+), 24 deletions(-)

diff --git a/src/video/windows/SDL_windowsevents.c b/src/video/windows/SDL_windowsevents.c
index d54b5ea41..2ac4e78ae 100644
--- a/src/video/windows/SDL_windowsevents.c
+++ b/src/video/windows/SDL_windowsevents.c
@@ -1686,31 +1686,8 @@ void SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback, void *userdata)
 
 int WIN_WaitEventTimeout(SDL_VideoDevice *_this, Sint64 timeoutNS)
 {
-    MSG msg;
     if (g_WindowsEnableMessageLoop) {
-        BOOL message_result;
-        UINT_PTR timer_id = 0;
-        if (timeoutNS > 0) {
-            timer_id = SetTimer(NULL, 0, (UINT)SDL_NS_TO_MS(timeoutNS), NULL);
-            message_result = GetMessage(&msg, 0, 0, 0);
-            KillTimer(NULL, timer_id);
-        } else if (timeoutNS == 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) {
-                if (!g_WindowsMessageHook(g_WindowsMessageHookData, &msg)) {
-                    return 1;
-                }
-            }
-            /* Always translate the message in case it's a non-SDL window (e.g. with Qt integration) */
-            TranslateMessage(&msg);
-            DispatchMessage(&msg);
+        if (MsgWaitForMultipleObjects(0, NULL, FALSE, (DWORD)SDL_NS_TO_MS(timeoutNS), QS_ALLINPUT)) {
             return 1;
         } else {
             return 0;