From 9d0b65ce847b838366cb8ac67718c7dbe661e2e4 Mon Sep 17 00:00:00 2001
From: Edgar Simo <bobbens@gmail.com>
Date: Mon, 4 Aug 2008 11:22:01 +0000
Subject: [PATCH] Added the concept of the HelperWindow to help with
 DirectInput.

---
 src/SDL.c                           | 14 +++++++++
 src/haptic/win32/SDL_syshaptic.c    |  8 +++--
 src/joystick/win32/SDL_dxjoystick.c |  4 +--
 src/video/win32/SDL_win32window.c   | 48 +++++++++++++++++++++++++++++
 4 files changed, 69 insertions(+), 5 deletions(-)

diff --git a/src/SDL.c b/src/SDL.c
index 968ab75e2..55f826071 100644
--- a/src/SDL.c
+++ b/src/SDL.c
@@ -51,6 +51,10 @@ extern void SDL_StartTicks(void);
 extern int SDL_TimerInit(void);
 extern void SDL_TimerQuit(void);
 #endif
+#if defined(__WIN32__)
+extern int SDL_HelperWindowCreate(void);
+extern int SDL_HelperWindowDestroy(void);
+#endif
 
 /* The initialized subsystems */
 static Uint32 SDL_initialized = 0;
@@ -172,6 +176,12 @@ SDL_Init(Uint32 flags)
     /* Clear the error message */
     SDL_ClearError();
 
+#if defined(__WIN32__)
+    if (SDL_HelperWindowCreate() < 0) {
+        return -1;
+    }
+#endif
+
     /* Initialize the desired subsystems */
     if (SDL_InitSubSystem(flags) < 0) {
         return (-1);
@@ -243,6 +253,10 @@ SDL_Quit(void)
     printf("[SDL_Quit] : Enter! Calling QuitSubSystem()\n");
     fflush(stdout);
 #endif
+
+#if defined(__WIN32__)
+    SDL_HelperWindowDestroy();
+#endif
     SDL_QuitSubSystem(SDL_INIT_EVERYTHING);
 
 #ifdef CHECK_LEAKS
diff --git a/src/haptic/win32/SDL_syshaptic.c b/src/haptic/win32/SDL_syshaptic.c
index ba2e5723e..291432cfc 100644
--- a/src/haptic/win32/SDL_syshaptic.c
+++ b/src/haptic/win32/SDL_syshaptic.c
@@ -36,7 +36,9 @@
 #include <dinput.h>
 #include <dxerr.h>
 #ifdef _MSC_VER
-#   pragma comment (lib, "dxerr.lib")
+#  pragma comment (lib, "dinput8.lib")
+#  pragma comment (lib, "dxguid.lib")
+#  pragma comment (lib, "dxerr.lib")
 #endif /* _MSC_VER */
 
     /* an ISO hack for VisualC++ */
@@ -88,7 +90,7 @@ static LPDIRECTINPUT dinput = NULL;
  * External stuff.
  */
 extern HINSTANCE SDL_Instance;
-extern HWND SDL_Window;
+extern HWND SDL_HelperWindow;
 
 
 /*
@@ -274,7 +276,7 @@ SDL_SYS_HapticOpenFromInstance(SDL_Haptic * haptic, DIDEVICEINSTANCE instance)
 
    /* Grab it exclusively to use force feedback stuff. */
    ret =IDirectInputDevice2_SetCooperativeLevel( haptic->hwdata->device,
-                                                 SDL_Window,
+                                                 SDL_HelperWindow,
                                                  DISCL_EXCLUSIVE | DISCL_BACKGROUND );
    if (FAILED(ret)) {
       DI_SetError("Setting cooperative level to exclusive",ret);
diff --git a/src/joystick/win32/SDL_dxjoystick.c b/src/joystick/win32/SDL_dxjoystick.c
index 563e3a01a..1ed5e1413 100644
--- a/src/joystick/win32/SDL_dxjoystick.c
+++ b/src/joystick/win32/SDL_dxjoystick.c
@@ -67,7 +67,7 @@
 
 /* external variables referenced. */
 extern HINSTANCE SDL_Instance;
-extern HWND SDL_Window;
+extern HWND SDL_HelperWindow;
 
 
 /* local variables */
@@ -250,7 +250,7 @@ SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
      * though. */
     result =
         IDirectInputDevice2_SetCooperativeLevel(joystick->hwdata->
-                                                InputDevice, SDL_Window,
+                                                InputDevice, SDL_HelperWindow,
                                                 DISCL_EXCLUSIVE |
                                                 DISCL_BACKGROUND);
     if (FAILED(result)) {
diff --git a/src/video/win32/SDL_win32window.c b/src/video/win32/SDL_win32window.c
index 07dc1a1f2..5be178fd8 100644
--- a/src/video/win32/SDL_win32window.c
+++ b/src/video/win32/SDL_win32window.c
@@ -30,6 +30,10 @@
 #include "SDL_syswm.h"
 
 
+/* Fake window to help with DirectInput events. */
+HWND SDL_HelperWindow = NULL;
+
+
 static int
 SetupWindowData(_THIS, SDL_Window * window, HWND hwnd, SDL_bool created)
 {
@@ -409,4 +413,48 @@ WIN_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info)
     }
 }
 
+
+/*
+ * Creates a HelperWindow used for DirectInput events.
+ */
+int
+SDL_HelperWindowCreate(void)
+{
+   HINSTANCE hInstance = pGetModuleHandleA(NULL);
+   const char *class_name = "SDLHelperWindowInputCatcher";
+   const char *win_name = "SDLHelperWindowInputMsgWindow";
+   WNDCLASSEX wce;
+
+   ZeroMemory(&wce, sizeof (wce));
+   wce.cbSize = sizeof(WNDCLASSEX);
+   wce.lpfnWndProc = RawWndProc;
+   wce.lpszClassName = class_name;
+   wce.hInstance = hInstance;
+
+   SDL_HelperWindow = pCreateWindowExA(0, class_name, win_name, WS_OVERLAPPEDWINDOW,
+         CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
+         CW_USEDEFAULT, HWND_MESSAGE, NULL, hInstance, NULL);
+
+   if (SDL_HelperWindow == NULL) {
+      SDL_SetError("Unable to create Helper Window.");
+      return -1;
+   }
+
+   return 0;
+}
+
+
+/*
+ * Destroys the HelperWindow previously created with SDL_HelperWindowCreate.
+ */
+void
+SDL_HelperWindowDestroy(void)
+{
+   if (SDL_HelperWindow) {
+      pDestroyWindow(SDL_HelperWindow);
+      SDL_HelperWindow = NULL;
+   }
+}
+
+
 /* vi: set ts=4 sw=4 expandtab: */