Fix hud

Signed-off-by: Slendi <slendi@socopon.com>

src/LunarWM_wayland.c

@@ -1594,6 +1594,18 @@ static void handle_output_frame(struct wl_listener *listener, void *data)
 
 	if (!wm->xr.available && !wm->renderer.first_frame) {
 		wm->renderer.camera.target = SphericalToVector3(wm->wm.pointer);
+
+		Vector3 forward = Vector3Normalize(Vector3Subtract(
+		    wm->renderer.camera.target, wm->renderer.camera.position));
+		Vector3 worldUp = (Vector3) { 0, 1, 0 };
+
+		if (fabsf(Vector3DotProduct(forward, worldUp)) > 0.999f) {
+			worldUp = (Vector3) { 0, 0, 1 };
+		}
+
+		Vector3 right = Vector3Normalize(Vector3CrossProduct(forward, worldUp));
+		wm->renderer.camera.up
+		    = Vector3Normalize(Vector3CrossProduct(right, forward));
 	}
 
 	int const hud_size = wm->cman->cfg.displays.hud.size;