[wayland] Move backend implementations into a backends/<name> directory

The aim is to be able to create a plugin for each of the backends.
The following directories are created:
* backends/drm
* backends/fbdev
* backends/wayland
* backends/x11

CMakeLists.txt

@@ -436,29 +436,29 @@ if(HAVE_WAYLAND)
     set(kwin_KDEINIT_SRCS
             ${kwin_KDEINIT_SRCS}
             abstract_backend.cpp
-            fb_backend.cpp
-            screens_fb.cpp
-            screens_wayland.cpp
-            screens_x11windowed.cpp
+            backends/fbdev/fb_backend.cpp
+            backends/fbdev/screens_fb.cpp
+            backends/wayland/screens_wayland.cpp
+            backends/x11/screens_x11windowed.cpp
             virtual_terminal.cpp
-            wayland_backend.cpp
+            backends/wayland/wayland_backend.cpp
             wayland_server.cpp
-            x11windowed_backend.cpp
+            backends/x11/x11windowed_backend.cpp
        )
     if(KWIN_HAVE_EGL AND Wayland_Egl_FOUND)
-        set(kwin_KDEINIT_SRCS ${kwin_KDEINIT_SRCS} egl_wayland_backend.cpp)
+        set(kwin_KDEINIT_SRCS ${kwin_KDEINIT_SRCS} backends/wayland/egl_wayland_backend.cpp)
     endif()
     if(HAVE_DRM)
         set(kwin_KDEINIT_SRCS
                 ${kwin_KDEINIT_SRCS}
-                drm_backend.cpp
-                screens_drm.cpp
+                backends/drm/drm_backend.cpp
+                backends/drm/screens_drm.cpp
             )
     endif()
     if(HAVE_GBM)
         set(kwin_KDEINIT_SRCS
                 ${kwin_KDEINIT_SRCS}
-                egl_gbm_backend.cpp
+                backends/drm/egl_gbm_backend.cpp
             )
     endif()
     if(HAVE_WAYLAND_CURSOR)

composite.cpp

@@ -38,7 +38,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "compositingprefs.h"
 #include "xcbutils.h"
 #if HAVE_WAYLAND
-#include "wayland_backend.h"
+#include "backends/wayland/wayland_backend.h"
 #include "wayland_server.h"
 #endif
 #include "decorations/decoratedclient.h"

eglonxbackend.cpp

@@ -25,7 +25,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "screens.h"
 #include "xcbutils.h"
 #if HAVE_X11_XCB
-#include "x11windowed_backend.h"
+#include "backends/x11/x11windowed_backend.h"
 #endif
 // kwin libs
 #include <kwinglplatform.h>

main_wayland.cpp

@@ -21,14 +21,14 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "workspace.h"
 #include <config-kwin.h>
 // kwin
-#include "fb_backend.h"
+#include "backends/fbdev/fb_backend.h"
 #if HAVE_DRM
-#include "drm_backend.h"
+#include "backends/drm/drm_backend.h"
 #endif
-#include "wayland_backend.h"
+#include "backends/wayland/wayland_backend.h"
 #include "wayland_server.h"
 #include "xcbutils.h"
-#include "x11windowed_backend.h"
+#include "backends/x11/x11windowed_backend.h"
 
 // KWayland
 #include <KWayland/Server/display.h>

scene_qpainter.cpp

@@ -29,13 +29,13 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "toplevel.h"
 #if HAVE_WAYLAND
 #if HAVE_DRM
-#include "drm_backend.h"
+#include "backends/drm/drm_backend.h"
 #endif
-#include "fb_backend.h"
+#include "backends/fbdev/fb_backend.h"
 #include "virtual_terminal.h"
-#include "wayland_backend.h"
+#include "backends/wayland/wayland_backend.h"
 #include "wayland_server.h"
-#include "x11windowed_backend.h"
+#include "backends/x11/x11windowed_backend.h"
 #include <KWayland/Client/buffer.h>
 #include <KWayland/Client/shm_pool.h>
 #include <KWayland/Client/surface.h>

workspace.cpp

@@ -52,9 +52,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "unmanaged.h"
 #include "useractions.h"
 #include "virtualdesktops.h"
-#if HAVE_WAYLAND
-#include "wayland_backend.h"
-#endif
 #include "xcbutils.h"
 #include "main.h"
 #include "decorations/decorationbridge.h"