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#ifndef BACKEND_WAYLAND_H
#define BACKEND_WAYLAND_H

#include <stdbool.h>

#include <wayland-client.h>
#include <wayland-server-core.h>

#include <wlr/backend/wayland.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_keyboard.h>
#include <wlr/types/wlr_pointer.h>
#include <wlr/types/wlr_tablet_pad.h>
#include <wlr/types/wlr_tablet_tool.h>
#include <wlr/types/wlr_touch.h>
#include <wlr/render/drm_format_set.h>

struct wlr_wl_backend {
	struct wlr_backend backend;

	/* local state */
	bool started;
	struct wl_display *local_display;
	struct wl_list outputs;
	int drm_fd;
	struct wl_list buffers; // wlr_wl_buffer.link
	size_t requested_outputs;
	struct wl_listener local_display_destroy;
	char *activation_token;

	/* remote state */
	struct wl_display *remote_display;
	struct wl_event_source *remote_display_src;
	struct wl_registry *registry;
	struct wl_compositor *compositor;
	struct xdg_wm_base *xdg_wm_base;
	struct zxdg_decoration_manager_v1 *zxdg_decoration_manager_v1;
	struct zwp_pointer_gestures_v1 *zwp_pointer_gestures_v1;
	struct wp_presentation *presentation;
	struct wl_shm *shm;
	struct zwp_linux_dmabuf_v1 *zwp_linux_dmabuf_v1;
	struct zwp_relative_pointer_manager_v1 *zwp_relative_pointer_manager_v1;
	struct wl_list seats; // wlr_wl_seat.link
	struct zwp_tablet_manager_v2 *tablet_manager;
	clockid_t presentation_clock;
	struct wlr_drm_format_set shm_formats;
	struct wlr_drm_format_set linux_dmabuf_v1_formats;
	struct wl_drm *legacy_drm;
	struct xdg_activation_v1 *activation_v1;
	char *drm_render_name;
};

struct wlr_wl_buffer {
	struct wlr_buffer *buffer;
	struct wl_buffer *wl_buffer;
	bool released;
	struct wl_list link; // wlr_wl_backend.buffers
	struct wl_listener buffer_destroy;
};

struct wlr_wl_presentation_feedback {
	struct wlr_wl_output *output;
	struct wl_list link;
	struct wp_presentation_feedback *feedback;
	uint32_t commit_seq;
};

struct wlr_wl_output {
	struct wlr_output wlr_output;

	struct wlr_wl_backend *backend;
	struct wl_list link;

	struct wl_surface *surface;
	struct wl_callback *frame_callback;
	struct xdg_surface *xdg_surface;
	struct xdg_toplevel *xdg_toplevel;
	struct zxdg_toplevel_decoration_v1 *zxdg_toplevel_decoration_v1;
	struct wl_list presentation_feedbacks;

	uint32_t enter_serial;

	struct {
		struct wlr_wl_pointer *pointer;
		struct wl_surface *surface;
		int32_t hotspot_x, hotspot_y;
	} cursor;
};

struct wlr_wl_pointer {
	struct wlr_pointer wlr_pointer;

	struct wlr_wl_seat *seat;
	struct wlr_wl_output *output;

	enum wlr_axis_source axis_source;
	int32_t axis_discrete;
	uint32_t fingers; // trackpad gesture

	struct wl_listener output_destroy;

	struct wl_list link;
};

struct wlr_wl_seat {
	char *name;
	struct wl_seat *wl_seat;

	struct wlr_wl_backend *backend;

	struct wl_keyboard *wl_keyboard;
	struct wlr_keyboard wlr_keyboard;

	struct wl_pointer *wl_pointer;
	struct wlr_wl_pointer *active_pointer;
	struct wl_list pointers; // wlr_wl_pointer::link

	struct zwp_pointer_gesture_swipe_v1 *gesture_swipe;
	struct zwp_pointer_gesture_pinch_v1 *gesture_pinch;
	struct zwp_pointer_gesture_hold_v1 *gesture_hold;
	struct zwp_relative_pointer_v1 *relative_pointer;

	struct wl_touch *wl_touch;
	struct wlr_touch wlr_touch;

	struct zwp_tablet_seat_v2 *zwp_tablet_seat_v2;
	struct zwp_tablet_v2 *zwp_tablet_v2;
	struct wlr_tablet wlr_tablet;
	struct zwp_tablet_tool_v2 *zwp_tablet_tool_v2;
	struct wlr_tablet_tool wlr_tablet_tool;
	struct zwp_tablet_pad_v2 *zwp_tablet_pad_v2;
	struct wlr_tablet_pad wlr_tablet_pad;

	struct wl_list link; // wlr_wl_backend.seats
};

struct wlr_wl_backend *get_wl_backend_from_backend(struct wlr_backend *backend);
void update_wl_output_cursor(struct wlr_wl_output *output);

void init_seat_keyboard(struct wlr_wl_seat *seat);

void init_seat_pointer(struct wlr_wl_seat *seat);
void finish_seat_pointer(struct wlr_wl_seat *seat);
void create_pointer(struct wlr_wl_seat *seat, struct wlr_wl_output *output);

void init_seat_touch(struct wlr_wl_seat *seat);

void init_seat_tablet(struct wlr_wl_seat *seat);
void finish_seat_tablet(struct wlr_wl_seat *seat);

bool create_wl_seat(struct wl_seat *wl_seat, struct wlr_wl_backend *wl);
void destroy_wl_seats(struct wlr_wl_backend *wl);
void destroy_wl_buffer(struct wlr_wl_buffer *buffer);

extern const struct wlr_pointer_impl wl_pointer_impl;
extern const struct wlr_tablet_pad_impl wl_tablet_pad_impl;
extern const struct wlr_tablet_impl wl_tablet_impl;

#endif