compositor: pass version in wlr_compositor_create

This allows wlroots to support newer versions of the interface
without breaking the API.

examples/fullscreen-shell.c

@@ -211,7 +211,7 @@ int main(int argc, char *argv[]) {
 	server.allocator = wlr_allocator_autocreate(server.backend,
 		server.renderer);
 
-	wlr_compositor_create(server.wl_display, server.renderer);
+	wlr_compositor_create(server.wl_display, 5, server.renderer);
 
 	server.output_layout = wlr_output_layout_create();
 

examples/output-layers.c

@@ -292,7 +292,7 @@ int main(int argc, char *argv[]) {
 		server.renderer);
 
 	struct wlr_compositor *compositor =
-		wlr_compositor_create(server.wl_display, server.renderer);
+		wlr_compositor_create(server.wl_display, 5, server.renderer);
 
 	wlr_xdg_shell_create(server.wl_display, 1);
 

examples/scene-graph.c

@@ -167,7 +167,7 @@ int main(int argc, char *argv[]) {
 		server.renderer);
 
 	struct wlr_compositor *compositor =
-		wlr_compositor_create(server.display, server.renderer);
+		wlr_compositor_create(server.display, 5, server.renderer);
 
 	wlr_xdg_shell_create(server.display, 2);
 

include/wlr/types/wlr_compositor.h

@@ -327,6 +327,6 @@ void wlr_surface_unlock_cached(struct wlr_surface *surface, uint32_t seq);
  * objects from client buffers on surface commit.
  */
 struct wlr_compositor *wlr_compositor_create(struct wl_display *display,
-	struct wlr_renderer *renderer);
+	uint32_t version, struct wlr_renderer *renderer);
 
 #endif

tinywl/tinywl.c

@@ -879,7 +879,7 @@ int main(int argc, char *argv[]) {
 	 * to dig your fingers in and play with their behavior if you want. Note that
 	 * the clients cannot set the selection directly without compositor approval,
 	 * see the handling of the request_set_selection event below.*/
-	wlr_compositor_create(server.wl_display, server.renderer);
+	wlr_compositor_create(server.wl_display, 5, server.renderer);
 	wlr_subcompositor_create(server.wl_display);
 	wlr_data_device_manager_create(server.wl_display);
 

types/wlr_compositor.c

@@ -1146,14 +1146,16 @@ static void compositor_handle_display_destroy(
 }
 
 struct wlr_compositor *wlr_compositor_create(struct wl_display *display,
-		struct wlr_renderer *renderer) {
+		uint32_t version, struct wlr_renderer *renderer) {
+	assert(version <= COMPOSITOR_VERSION);
+
 	struct wlr_compositor *compositor = calloc(1, sizeof(*compositor));
 	if (!compositor) {
 		return NULL;
 	}
 
 	compositor->global = wl_global_create(display, &wl_compositor_interface,
-		COMPOSITOR_VERSION, compositor, compositor_bind);
+		version, compositor, compositor_bind);
 	if (!compositor->global) {
 		free(compositor);
 		return NULL;