Fixed bug 4152 - Windows 10 v1803 update seems to have fixed the jumping mouse bug (see bug #3931.)

src/video/windows/SDL_windowsevents.c

@@ -359,11 +359,6 @@ ShouldGenerateWindowCloseOnAltF4(void)
     return !SDL_GetHintBoolean(SDL_HINT_WINDOWS_NO_CLOSE_ON_ALT_F4, SDL_FALSE);
 }
 
-/* Win10 "Fall Creators Update" introduced the bug that SetCursorPos() (as used by SDL_WarpMouseInWindow())
-   doesn't reliably generate WM_MOUSEMOVE events anymore (see #3931) which breaks relative mouse mode via warping.
-   This is used to implement a workaround.. */
-static SDL_bool isWin10FCUorNewer = SDL_FALSE;
-
 LRESULT CALLBACK
 WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
@@ -486,17 +481,6 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
             if (!mouse->relative_mode || mouse->relative_mode_warp) {
                 SDL_MouseID mouseID = (((GetMessageExtraInfo() & MOUSEEVENTF_FROMTOUCH) == MOUSEEVENTF_FROMTOUCH) ? SDL_TOUCH_MOUSEID : 0);
                 SDL_SendMouseMotion(data->window, mouseID, 0, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
-                if (isWin10FCUorNewer && mouseID != SDL_TOUCH_MOUSEID && mouse->relative_mode_warp) {
-                    /* To work around #3931, Win10 bug introduced in Fall Creators Update, where
-                       SetCursorPos() (SDL_WarpMouseInWindow()) doesn't reliably generate mouse events anymore,
-                       after each windows mouse event generate a fake event for the middle of the window
-                       if relative_mode_warp is used */
-                    int center_x = 0, center_y = 0;
-                    SDL_GetWindowSize(data->window, &center_x, &center_y);
-                    center_x /= 2;
-                    center_y /= 2;
-                    SDL_SendMouseMotion(data->window, mouseID, 0, center_x, center_y);
-                }
             }
         }
         /* don't break here, fall through to check the wParam like the button presses */
@@ -1074,43 +1058,6 @@ WIN_PumpEvents(_THIS)
     }
 }
 
-/* to work around #3931, a bug introduced in Win10 Fall Creators Update (build nr. 16299)
-   we need to detect the windows version. this struct and the function below does that.
-   usually this struct and the corresponding function (RtlGetVersion) are in <Ntddk.h>
-   but here we just load it dynamically */
-struct SDL_WIN_OSVERSIONINFOW {
-    ULONG dwOSVersionInfoSize;
-    ULONG dwMajorVersion;
-    ULONG dwMinorVersion;
-    ULONG dwBuildNumber;
-    ULONG dwPlatformId;
-    WCHAR szCSDVersion[128];
-};
-
-static SDL_bool
-IsWin10FCUorNewer(void)
-{
-    HMODULE handle = GetModuleHandleW(L"ntdll.dll");
-    if (handle) {
-        typedef LONG(WINAPI* RtlGetVersionPtr)(struct SDL_WIN_OSVERSIONINFOW*);
-        RtlGetVersionPtr getVersionPtr = (RtlGetVersionPtr)GetProcAddress(handle, "RtlGetVersion");
-        if (getVersionPtr != NULL) {
-            struct SDL_WIN_OSVERSIONINFOW info;
-            SDL_zero(info);
-            info.dwOSVersionInfoSize = sizeof(info);
-            if (getVersionPtr(&info) == 0) { /* STATUS_SUCCESS == 0 */
-                if (   (info.dwMajorVersion == 10 && info.dwMinorVersion == 0 && info.dwBuildNumber >= 16299)
-                    || (info.dwMajorVersion == 10 && info.dwMinorVersion > 0)
-                    || (info.dwMajorVersion > 10) )
-                {
-                    return SDL_TRUE;
-                }
-            }
-        }
-    }
-    return SDL_FALSE;
-}
-
 static int app_registered = 0;
 LPTSTR SDL_Appname = NULL;
 Uint32 SDL_Appstyle = 0;
@@ -1175,8 +1122,6 @@ SDL_RegisterApp(char *name, Uint32 style, void *hInst)
         return SDL_SetError("Couldn't register application class");
     }
 
-    isWin10FCUorNewer = IsWin10FCUorNewer();
-
     app_registered = 1;
     return 0;
 }