wiiu/render: move window-related functions to own file

src/render/wiiu/SDL_render_wiiu.c

@@ -130,16 +130,6 @@ WIIU_CreateRenderer(SDL_Window * window, Uint32 flags)
     return renderer;
 }
 
-static void
-WIIU_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
-{
-    if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED) {
-        // Re-init the colour buffer etc. for new window size
-        // TODO check: what if we're rendering to a texture when this happens?
-        WIIU_SetRenderTarget(renderer, NULL);
-    }
-}
-
 static int
 WIIU_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
 {

src/render/wiiu/SDL_rwindow_wiiu.c

@@ -0,0 +1,48 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 2018-2018 Ash Logan <ash@heyquark.com>
+  Copyright (C) 2018-2018 Roberto Van Eeden <r.r.qwertyuiop.r.r@gmail.com>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_WIIU
+
+#include "../../video/wiiu/wiiuvideo.h"
+#include "../SDL_sysrender.h"
+#include "SDL_hints.h"
+#include "SDL_render_wiiu.h"
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+static void
+WIIU_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
+{
+    if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED) {
+        // Re-init the colour buffer etc. for new window size
+        // TODO check: what if we're rendering to a texture when this happens?
+        WIIU_SetRenderTarget(renderer, NULL);
+    }
+}
+
+#endif //SDL_VIDEO_RENDER_WIIU