static void renderlayer(Monitor *m, struct wl_list *layer_surfaces);
static void renderlayersurface(struct wlr_surface *surface, int sx, int sy, void *data);

}
void
renderlayer(Monitor *m, struct wl_list *layer_surfaces)
{
	LayerSurface *layersurface;
	wl_list_for_each(layersurface, layer_surfaces, link)
		wlr_surface_for_each_surface(layersurface->layer_surface->surface,
			renderlayersurface, layersurface);

renderlayersurface(struct wlr_surface *surface, int sx, int sy, void *data)
{
	LayerSurface *layersurface = data;
	struct wlr_texture *texture = wlr_surface_get_texture(surface);
	struct wlr_output *output;
	double ox = 0, oy = 0;
	enum wl_output_transform transform;
	struct wlr_box box;
	float matrix[9];
	struct timespec now;
	if (!texture) {
		return;
	}
	output = layersurface->layer_surface->output;
	wlr_output_layout_output_coords(output_layout, output, &ox, &oy);
	ox += layersurface->geo.x + sx, oy += layersurface->geo.y + sy;
	transform = wlr_output_transform_invert(surface->current.transform);
	memcpy(&box, &layersurface->geo, sizeof(struct wlr_box));
	wlr_matrix_project_box(matrix, &box, transform, 0,
		output->transform_matrix);
	wlr_render_texture_with_matrix(drw, texture, matrix, 1);
	clock_gettime(CLOCK_MONOTONIC, &now);
	wlr_surface_send_frame_done(surface, &now);
}
void

		renderlayer(m, &m->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND]);
		renderlayer(m, &m->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM]);

		renderlayer(m, &m->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP]);
		renderlayer(m, &m->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY]);