Added a userdata parameter to SDL_SetWindowsMessageHook()

include/SDL_system.h

@@ -46,8 +46,8 @@ extern "C" {
 /**
    \brief Set a function that is called for every windows message, before TranslateMessage()
 */
-typedef void (*SDL_WindowsMessageHook)(void *hWnd, unsigned int message, Uint64 wParam, Sint64 lParam);
-extern DECLSPEC void SDLCALL SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback);
+typedef void (SDLCALL * SDL_WindowsMessageHook)(void *userdata, void *hWnd, unsigned int message, Uint64 wParam, Sint64 lParam);
+extern DECLSPEC void SDLCALL SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback, void *userdata);
 
 /**
    \brief Returns the D3D9 adapter index that matches the specified display index.

src/dynapi/SDL_dynapi_procs.h

@@ -625,5 +625,5 @@ SDL_DYNAPI_PROC(Uint32,SDL_GetQueuedAudioSize,(SDL_AudioDeviceID a),(a),return)
 SDL_DYNAPI_PROC(void,SDL_ClearQueuedAudio,(SDL_AudioDeviceID a),(a),)
 SDL_DYNAPI_PROC(SDL_Window*,SDL_GetGrabbedWindow,(void),(),return)
 #ifdef __WIN32__
-SDL_DYNAPI_PROC(void,SDL_SetWindowsMessageHook,(SDL_WindowsMessageHook a),(a),)
+SDL_DYNAPI_PROC(void,SDL_SetWindowsMessageHook,(SDL_WindowsMessageHook a, void *b),(a,b),)
 #endif

src/video/windows/SDL_windowsevents.c

@@ -928,10 +928,12 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 
 /* A message hook called before TranslateMessage() */
 static SDL_WindowsMessageHook g_WindowsMessageHook = NULL;
+static void *g_WindowsMessageHookData = NULL;
 
-void SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback)
+void SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback, void *userdata)
 {
     g_WindowsMessageHook = callback;
+    g_WindowsMessageHookData = userdata;
 }
 
 void
@@ -944,7 +946,7 @@ WIN_PumpEvents(_THIS)
     if (g_WindowsEnableMessageLoop) {
         while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
             if (g_WindowsMessageHook) {
-                g_WindowsMessageHook(msg.hwnd, msg.message, msg.wParam, msg.lParam);
+                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) */