WIP testing non-callback

wayland.h

@@ -43,6 +43,20 @@ struct client_state {
     EGLContext egl_context;
 };
 
+#define EVENT_DRAW 0
+
+struct event {
+    int type;
+    union {
+        /// EVENT_DRAW
+        struct {
+            int width, height;
+        } draw;
+    } data;
+};
+
 void wayland_init(struct client_state *state, int output_type);
 void commit(struct client_state *state);
+/// Provide pointer to be filled.
+void wait_for_event(struct client_state *state, struct event event);