fix compile errors, work with unmodified SDL

apps/openmw/mwinput/sdlinputwrapper.cpp

@@ -1,5 +1,15 @@
 #include "sdlinputwrapper.hpp"
 #include <SDL2/SDL.h>
+#include <SDL2/SDL_syswm.h>
+
+#include <OgrePlatform.h>
+
+#if OGRE_PLATFORM == OGRE_PLATFORM_LINUX
+#   include <X11/Xlib.h>
+#   include <X11/Xutil.h>
+#   include <X11/Xos.h>
+#endif
+
 
 namespace MWInput
 {
@@ -62,9 +72,45 @@ namespace MWInput
             size_t windowHnd;
             mWindow->getCustomAttribute("WINDOW", &windowHnd);
 
-            //just use that one for input
-            SDL_Init(flags);
+            //kindly ask SDL not to trash our OGL context
+            SDL_SetHint(SDL_HINT_RENDER_DRIVER, "software");
+            SDL_Init(SDL_INIT_VIDEO);
+
+            //wrap our own event handler around ogre's
             mSDLWindow = SDL_CreateWindowFrom((void*)windowHnd);
+
+#if OGRE_PLATFORM == OGRE_PLATFORM_LINUX
+            //linux-specific event-handling fixups
+            SDL_SysWMinfo wm_info;
+            SDL_VERSION(&wm_info.version);
+
+            if(SDL_GetWindowWMInfo(mSDLWindow,&wm_info))
+            {
+                printf("SDL version %d.%d.%d\n", wm_info.version.major, wm_info.version.minor, wm_info.version.patch);
+
+                Display* display = wm_info.info.x11.display;
+                Window w = wm_info.info.x11.window;
+
+                // Set the input hints so we get keyboard input
+                XWMHints *wmhints = XAllocWMHints();
+                if (wmhints) {
+                    wmhints->input = True;
+                    wmhints->flags = InputHint;
+                    XSetWMHints(display, w, wmhints);
+                    XFree(wmhints);
+                }
+
+                //make sure to subscribe to XLib's events
+                XSelectInput(display, w,
+                             (FocusChangeMask | EnterWindowMask | LeaveWindowMask |
+                             ExposureMask | ButtonPressMask | ButtonReleaseMask |
+                             PointerMotionMask | KeyPressMask | KeyReleaseMask |
+                             PropertyChangeMask | StructureNotifyMask |
+                             KeymapStateMask));
+
+                XFlush(display);
+            }
+#endif
         }
     }
 }

extern/oics/OISCompat.h

@@ -20,17 +20,12 @@ struct MWSDLMouseMotionEvent : SDL_MouseMotionEvent {
 
     MWSDLMouseMotionEvent()
     {
-        x = 0;
-        y = 0;
-        xrel = 0;
-        yrel = 0;
-        state = 0;
-        zrel = 0;
+        _init();
     }
 
-    MWSDLMouseMotionEvent( const SDL_MouseMotionEvent& evt) :
-        MWSDLMouseMotionEvent()
+    MWSDLMouseMotionEvent( const SDL_MouseMotionEvent& evt)
     {
+        _init();
         x = evt.x;
         y = evt.y;
         xrel = evt.xrel;
@@ -41,8 +36,19 @@ struct MWSDLMouseMotionEvent : SDL_MouseMotionEvent {
     MWSDLMouseMotionEvent (const SDL_MouseWheelEvent& evt) :
         MWSDLMouseMotionEvent()
     {
+        _init();
         zrel = evt.y;
     }
+
+    void _init()
+    {
+        x = 0;
+        y = 0;
+        xrel = 0;
+        yrel = 0;
+        state = 0;
+        zrel = 0;
+    }
 };