/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

#include "SDL_internal.h"

#ifdef SDL_VIDEO_DRIVER_WAYLAND

#include "../../core/unix/SDL_poll.h"
#include "../../events/SDL_events_c.h"
#include "../../events/SDL_scancode_tables_c.h"
#include "../../events/SDL_keysym_to_keycode_c.h"
#include "../../core/linux/SDL_system_theme.h"
#include "../SDL_sysvideo.h"

#include "SDL_waylandvideo.h"
#include "SDL_waylandevents_c.h"
#include "SDL_waylandwindow.h"
#include "SDL_waylandmouse.h"
#include "SDL_waylandclipboard.h"
#include "SDL_waylandkeyboard.h"

#include "pointer-constraints-unstable-v1-client-protocol.h"
#include "relative-pointer-unstable-v1-client-protocol.h"
#include "xdg-shell-client-protocol.h"
#include "keyboard-shortcuts-inhibit-unstable-v1-client-protocol.h"
#include "text-input-unstable-v3-client-protocol.h"
#include "tablet-v2-client-protocol.h"
#include "primary-selection-unstable-v1-client-protocol.h"
#include "input-timestamps-unstable-v1-client-protocol.h"
#include "pointer-gestures-unstable-v1-client-protocol.h"
#include "cursor-shape-v1-client-protocol.h"
#include "viewporter-client-protocol.h"

#ifdef HAVE_LIBDECOR_H
#include <libdecor.h>
#endif

#ifdef SDL_INPUT_LINUXEV
#include <linux/input.h>
#else
#define BTN_LEFT   (0x110)
#define BTN_RIGHT  (0x111)
#define BTN_MIDDLE (0x112)
#define BTN_SIDE   (0x113)
#define BTN_EXTRA  (0x114)
#endif
#include "../../events/SDL_keysym_to_scancode_c.h"
#include "../../events/imKStoUCS.h"
#include <errno.h>
#include <sys/mman.h>
#include <unistd.h>
#include <xkbcommon/xkbcommon-compose.h>
#include <xkbcommon/xkbcommon.h>

// Weston uses a ratio of 10 units per scroll tick
#define WAYLAND_WHEEL_AXIS_UNIT 10

#ifndef XKB_MOD_NAME_MOD3
#define XKB_MOD_NAME_MOD3 "Mod3"
#endif

#ifndef XKB_MOD_NAME_MOD5
#define XKB_MOD_NAME_MOD5 "Mod5"
#endif

// Keyboard and mouse names to match XWayland
#define WAYLAND_DEFAULT_KEYBOARD_NAME "Virtual core keyboard"
#define WAYLAND_DEFAULT_POINTER_NAME "Virtual core pointer"
#define WAYLAND_DEFAULT_TOUCH_NAME "Virtual core touch"

// Focus clickthrough timeout
#define WAYLAND_FOCUS_CLICK_TIMEOUT_NS SDL_MS_TO_NS(10)

// Timer rollover detection thresholds
#define WAYLAND_TIMER_ROLLOVER_INTERVAL_LOW  (SDL_MAX_UINT32 / 16U)
#define WAYLAND_TIMER_ROLLOVER_INTERVAL_HIGH (WAYLAND_TIMER_ROLLOVER_INTERVAL_LOW * 15U)

// Scoped function declarations
static void Wayland_SeatUpdateKeyboardGrab(SDL_WaylandSeat *seat);

typedef struct
{
    SDL_TouchID id;
    wl_fixed_t fx;
    wl_fixed_t fy;
    struct wl_surface *surface;

    struct wl_list link;
} SDL_WaylandTouchPoint;

static void Wayland_SeatAddTouch(SDL_WaylandSeat *seat, SDL_TouchID id, wl_fixed_t fx, wl_fixed_t fy, struct wl_surface *surface)
{
    SDL_WaylandTouchPoint *tp = SDL_malloc(sizeof(SDL_WaylandTouchPoint));

    SDL_zerop(tp);
    tp->id = id;
    tp->fx = fx;
    tp->fy = fy;
    tp->surface = surface;

    WAYLAND_wl_list_insert(&seat->touch.points, &tp->link);
}

static void Wayland_SeatCancelTouch(SDL_WaylandSeat *seat, SDL_WaylandTouchPoint *tp)
{
    if (tp->surface) {
        SDL_WindowData *window_data = (SDL_WindowData *)wl_surface_get_user_data(tp->surface);

        if (window_data) {
            const float x = (float)(wl_fixed_to_double(tp->fx) / window_data->current.logical_width);
            const float y = (float)(wl_fixed_to_double(tp->fy) / window_data->current.logical_height);

            SDL_SendTouch(0, (SDL_TouchID)(uintptr_t)seat->touch.wl_touch,
                          (SDL_FingerID)(tp->id + 1), window_data->sdlwindow, SDL_EVENT_FINGER_CANCELED, x, y, 0.0f);

            --window_data->active_touch_count;

            /* If the window currently has mouse focus and has no currently active keyboards, pointers,
             * or touch events, then consider mouse focus to be lost.
             */
            if (SDL_GetMouseFocus() == window_data->sdlwindow && !window_data->keyboard_focus_count &&
                !window_data->pointer_focus_count && !window_data->active_touch_count) {
                SDL_SetMouseFocus(NULL);
            }
        }
    }

    WAYLAND_wl_list_remove(&tp->link);
    SDL_free(tp);
}

static void Wayland_SeatUpdateTouch(SDL_WaylandSeat *seat, SDL_TouchID id, wl_fixed_t fx, wl_fixed_t fy, struct wl_surface **surface)
{
    SDL_WaylandTouchPoint *tp;

    wl_list_for_each (tp, &seat->touch.points, link) {
        if (tp->id == id) {
            tp->fx = fx;
            tp->fy = fy;
            if (surface) {
                *surface = tp->surface;
            }
            break;
        }
    }
}

static void Wayland_SeatRemoveTouch(SDL_WaylandSeat *seat, SDL_TouchID id, wl_fixed_t *fx, wl_fixed_t *fy, struct wl_surface **surface)
{
    SDL_WaylandTouchPoint *tp;

    wl_list_for_each (tp, &seat->touch.points, link) {
        if (tp->id == id) {
            if (fx) {
                *fx = tp->fx;
            }
            if (fy) {
                *fy = tp->fy;
            }
            if (surface) {
                *surface = tp->surface;
            }

            WAYLAND_wl_list_remove(&tp->link);
            SDL_free(tp);
            break;
        }
    }
}

static void Wayland_GetScaledMouseRect(SDL_Window *window, SDL_Rect *scaled_rect)
{
    SDL_WindowData *window_data = window->internal;

    scaled_rect->x = (int)SDL_floor(window->mouse_rect.x / window_data->pointer_scale.x);
    scaled_rect->y = (int)SDL_floor(window->mouse_rect.y / window_data->pointer_scale.y);
    scaled_rect->w = (int)SDL_ceil(window->mouse_rect.w / window_data->pointer_scale.x);
    scaled_rect->h = (int)SDL_ceil(window->mouse_rect.h / window_data->pointer_scale.y);
}

static Uint64 Wayland_AdjustEventTimestampBase(Uint64 nsTimestamp)
{
    static Uint64 timestamp_offset = 0;
    const Uint64 now = SDL_GetTicksNS();

    if (!timestamp_offset) {
        timestamp_offset = (now - nsTimestamp);
    }
    nsTimestamp += timestamp_offset;

    if (nsTimestamp > now) {
        timestamp_offset -= (nsTimestamp - now);
        nsTimestamp = now;
    }

    return nsTimestamp;
}

/* This should only be called with 32-bit millisecond timestamps received in Wayland events!
 * No synthetic or high-res timestamps, as they can corrupt the rollover offset!
 */
static Uint64 Wayland_EventTimestampMSToNS(Uint32 wl_timestamp_ms)
{
    static Uint64 timestamp_offset = 0;
    static Uint32 last = 0;
    Uint64 timestamp = SDL_MS_TO_NS(wl_timestamp_ms) + timestamp_offset;

    if (wl_timestamp_ms >= last) {
        if (timestamp_offset && last < WAYLAND_TIMER_ROLLOVER_INTERVAL_LOW && wl_timestamp_ms > WAYLAND_TIMER_ROLLOVER_INTERVAL_HIGH) {
            // A time that crossed backwards across zero was received. Subtract the increased time base offset.
            timestamp -= SDL_MS_TO_NS(SDL_UINT64_C(0x100000000));
        } else {
            last = wl_timestamp_ms;
        }
    } else {
        /* Only increment the base time offset if the timer actually crossed forward across 0,
         * and not if this is just a timestamp from a slightly older event.
         */
        if (wl_timestamp_ms < WAYLAND_TIMER_ROLLOVER_INTERVAL_LOW && last > WAYLAND_TIMER_ROLLOVER_INTERVAL_HIGH) {
            timestamp_offset += SDL_MS_TO_NS(SDL_UINT64_C(0x100000000));
            timestamp += SDL_MS_TO_NS(SDL_UINT64_C(0x100000000));
            last = wl_timestamp_ms;
        }
    }

    return timestamp;
}

/* Even if high-res timestamps are available, the millisecond timestamps are still processed
 * to accumulate the rollover offset if needed later.
 */

static Uint64 Wayland_GetKeyboardTimestamp(SDL_WaylandSeat *seat, Uint32 wl_timestamp_ms)
{
    const Uint64 adjustedTimestampNS = Wayland_EventTimestampMSToNS(wl_timestamp_ms);
    return Wayland_AdjustEventTimestampBase(seat->keyboard.timestamps ? seat->keyboard.highres_timestamp_ns : adjustedTimestampNS);
}

static Uint64 Wayland_GetPointerTimestamp(SDL_WaylandSeat *seat, Uint32 wl_timestamp_ms)
{
    const Uint64 adjustedTimestampNS = Wayland_EventTimestampMSToNS(wl_timestamp_ms);
    return Wayland_AdjustEventTimestampBase(seat->pointer.timestamps ? seat->pointer.highres_timestamp_ns : adjustedTimestampNS);
}

Uint64 Wayland_GetTouchTimestamp(SDL_WaylandSeat *seat, Uint32 wl_timestamp_ms)
{
    const Uint64 adjustedTimestampNS = Wayland_EventTimestampMSToNS(wl_timestamp_ms);
    return Wayland_AdjustEventTimestampBase(seat->touch.timestamps ? seat->touch.highres_timestamp_ns : adjustedTimestampNS);
}

static void input_timestamp_listener(void *data, struct zwp_input_timestamps_v1 *zwp_input_timestamps_v1,
                                             uint32_t tv_sec_hi, uint32_t tv_sec_lo, uint32_t tv_nsec)
{
    *((Uint64 *)data) = ((((Uint64)tv_sec_hi << 32) | (Uint64)tv_sec_lo) * SDL_NS_PER_SECOND) + tv_nsec;
}

static const struct zwp_input_timestamps_v1_listener timestamp_listener = {
    input_timestamp_listener
};

static void Wayland_SeatRegisterInputTimestampListeners(SDL_WaylandSeat *seat)
{
    if (seat->display->input_timestamps_manager) {
        if (seat->keyboard.wl_keyboard && !seat->keyboard.timestamps) {
            seat->keyboard.timestamps = zwp_input_timestamps_manager_v1_get_keyboard_timestamps(seat->display->input_timestamps_manager, seat->keyboard.wl_keyboard);
            zwp_input_timestamps_v1_add_listener(seat->keyboard.timestamps, &timestamp_listener, &seat->keyboard.highres_timestamp_ns);
        }

        if (seat->pointer.wl_pointer && !seat->pointer.timestamps) {
            seat->pointer.timestamps = zwp_input_timestamps_manager_v1_get_pointer_timestamps(seat->display->input_timestamps_manager, seat->pointer.wl_pointer);
            zwp_input_timestamps_v1_add_listener(seat->pointer.timestamps, &timestamp_listener, &seat->pointer.highres_timestamp_ns);
        }

        if (seat->touch.wl_touch && !seat->touch.timestamps) {
            seat->touch.timestamps = zwp_input_timestamps_manager_v1_get_touch_timestamps(seat->display->input_timestamps_manager, seat->touch.wl_touch);
            zwp_input_timestamps_v1_add_listener(seat->touch.timestamps, &timestamp_listener, &seat->touch.highres_timestamp_ns);
        }
    }
}

void Wayland_DisplayInitInputTimestampManager(SDL_VideoData *display)
{
    if (display->input_timestamps_manager) {
        SDL_WaylandSeat *seat;
        wl_list_for_each (seat, &display->seat_list, link) {
            Wayland_SeatRegisterInputTimestampListeners(seat);
        }
    }
}

static void handle_pinch_begin(void *data, struct zwp_pointer_gesture_pinch_v1 *zwp_pointer_gesture_pinch_v1, uint32_t serial, uint32_t time, struct wl_surface *surface, uint32_t fingers)
{
    if (!surface) {
        return;
    }

    SDL_WindowData *wind = Wayland_GetWindowDataForOwnedSurface(surface);
    if (wind) {
        SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
        seat->pointer.gesture_focus = wind;

        const Uint64 timestamp = Wayland_GetPointerTimestamp(seat, time);
        SDL_SendPinch(SDL_EVENT_PINCH_BEGIN, timestamp, wind->sdlwindow, 0.0f);
    }
}

static void handle_pinch_update(void *data, struct zwp_pointer_gesture_pinch_v1 *zwp_pointer_gesture_pinch_v1, uint32_t time,
                                wl_fixed_t dx, wl_fixed_t dy, wl_fixed_t scale, wl_fixed_t rotation)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;

    if (seat->pointer.gesture_focus) {
        const Uint64 timestamp = Wayland_GetPointerTimestamp(seat, time);
        const float s = (float)wl_fixed_to_double(scale);
        SDL_SendPinch(SDL_EVENT_PINCH_UPDATE, timestamp, seat->pointer.gesture_focus->sdlwindow, s);
    }
}

static void handle_pinch_end(void *data, struct zwp_pointer_gesture_pinch_v1 *zwp_pointer_gesture_pinch_v1, uint32_t serial, uint32_t time, int32_t cancelled)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;

    if (seat->pointer.gesture_focus) {
        const Uint64 timestamp = Wayland_GetPointerTimestamp(seat, time);
        SDL_SendPinch(SDL_EVENT_PINCH_END, timestamp, seat->pointer.gesture_focus->sdlwindow, 0.0f);

        seat->pointer.gesture_focus = NULL;
    }
}

static const struct zwp_pointer_gesture_pinch_v1_listener gesture_pinch_listener = {
    handle_pinch_begin,
    handle_pinch_update,
    handle_pinch_end
};

static void Wayland_SeatCreatePointerGestures(SDL_WaylandSeat *seat)
{
    if (seat->display->zwp_pointer_gestures) {
        if (seat->pointer.wl_pointer && !seat->pointer.gesture_pinch) {
            seat->pointer.gesture_pinch = zwp_pointer_gestures_v1_get_pinch_gesture(seat->display->zwp_pointer_gestures, seat->pointer.wl_pointer);
            zwp_pointer_gesture_pinch_v1_set_user_data(seat->pointer.gesture_pinch, seat);
            zwp_pointer_gesture_pinch_v1_add_listener(seat->pointer.gesture_pinch, &gesture_pinch_listener, seat);
        }
    }
}

void Wayland_DisplayInitPointerGestureManager(SDL_VideoData *display)
{
    SDL_WaylandSeat *seat;
    wl_list_for_each (seat, &display->seat_list, link) {
        Wayland_SeatCreatePointerGestures(seat);
    }
}

static void Wayland_SeatCreateCursorShape(SDL_WaylandSeat *seat)
{
    if (seat->display->cursor_shape_manager) {
        if (seat->pointer.wl_pointer && !seat->pointer.cursor_state.cursor_shape) {
            seat->pointer.cursor_state.cursor_shape = wp_cursor_shape_manager_v1_get_pointer(seat->display->cursor_shape_manager, seat->pointer.wl_pointer);
        }

        SDL_WaylandPenTool *tool;
        wl_list_for_each(tool, &seat->tablet.tool_list, link) {
            if (!tool->cursor_state.cursor_shape) {
                tool->cursor_state.cursor_shape = wp_cursor_shape_manager_v1_get_tablet_tool_v2(seat->display->cursor_shape_manager, tool->wltool);
            }
        }
    }
}

void Wayland_DisplayInitCursorShapeManager(SDL_VideoData *display)
{
    SDL_WaylandSeat *seat;
    wl_list_for_each (seat, &display->seat_list, link) {
        Wayland_SeatCreateCursorShape(seat);
    }
}

static void Wayland_SeatSetKeymap(SDL_WaylandSeat *seat)
{
    const bool send_event = !seat->display->initializing;

    if (seat->keyboard.sdl_keymap &&
        seat->keyboard.xkb.current_layout < seat->keyboard.xkb.num_layouts &&
        seat->keyboard.sdl_keymap[seat->keyboard.xkb.current_layout] != SDL_GetCurrentKeymap(true)) {
        SDL_SetKeymap(seat->keyboard.sdl_keymap[seat->keyboard.xkb.current_layout], send_event);
        SDL_SetModState(seat->keyboard.pressed_modifiers | seat->keyboard.locked_modifiers);
    }
}

// Returns true if a key repeat event was due
static bool keyboard_repeat_handle(SDL_WaylandKeyboardRepeat *repeat_info, Uint64 elapsed)
{
    bool ret = false;

    while (elapsed >= repeat_info->next_repeat_ns) {
        if (repeat_info->scancode != SDL_SCANCODE_UNKNOWN) {
            const Uint64 timestamp = repeat_info->base_time_ns + repeat_info->next_repeat_ns;
            SDL_SendKeyboardKeyIgnoreModifiers(Wayland_AdjustEventTimestampBase(timestamp), repeat_info->keyboard_id, repeat_info->key, repeat_info->scancode, true);
        }
        if (repeat_info->text[0]) {
            SDL_SendKeyboardText(repeat_info->text);
        }
        repeat_info->next_repeat_ns += SDL_NS_PER_SECOND / (Uint64)repeat_info->repeat_rate;
        ret = true;
    }
    return ret;
}

static void keyboard_repeat_clear(SDL_WaylandKeyboardRepeat *repeat_info)
{
    if (!repeat_info->is_initialized) {
        return;
    }
    repeat_info->is_key_down = false;
}

static void keyboard_repeat_set(SDL_WaylandKeyboardRepeat *repeat_info, Uint32 keyboard_id, uint32_t key, Uint32 wl_press_time_ms,
                                Uint64 base_time_ns, uint32_t scancode, bool has_text, char text[8])
{
    if (!repeat_info->is_initialized || !repeat_info->repeat_rate) {
        return;
    }
    repeat_info->is_key_down = true;
    repeat_info->keyboard_id = keyboard_id;
    repeat_info->key = key;
    repeat_info->wl_press_time_ms = wl_press_time_ms;
    repeat_info->base_time_ns = base_time_ns;
    repeat_info->sdl_press_time_ns = SDL_GetTicksNS();
    repeat_info->next_repeat_ns = SDL_MS_TO_NS(repeat_info->repeat_delay_ms);
    repeat_info->scancode = scancode;
    if (has_text) {
        SDL_memcpy(repeat_info->text, text, sizeof(repeat_info->text));
    } else {
        repeat_info->text[0] = '\0';
    }
}

static uint32_t keyboard_repeat_get_key(SDL_WaylandKeyboardRepeat *repeat_info)
{
    if (repeat_info->is_initialized && repeat_info->is_key_down) {
        return repeat_info->key;
    }

    return 0;
}

static void keyboard_repeat_set_text(SDL_WaylandKeyboardRepeat *repeat_info, const char text[8])
{
    if (repeat_info->is_initialized) {
        SDL_copyp(repeat_info->text, text);
    }
}

static bool keyboard_repeat_is_set(SDL_WaylandKeyboardRepeat *repeat_info)
{
    return repeat_info->is_initialized && repeat_info->is_key_down;
}

static bool keyboard_repeat_key_is_set(SDL_WaylandKeyboardRepeat *repeat_info, uint32_t key)
{
    return repeat_info->is_initialized && repeat_info->is_key_down && key == repeat_info->key;
}

static void sync_done_handler(void *data, struct wl_callback *callback, uint32_t callback_data)
{
    // Nothing to do, just destroy the callback
    wl_callback_destroy(callback);
}

static struct wl_callback_listener sync_listener = {
    sync_done_handler
};

void Wayland_SendWakeupEvent(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_VideoData *d = _this->internal;

    /* Queue a sync event to unblock the event queue fd if it's empty and being waited on.
     * TODO: Maybe use a pipe to avoid the compositor roundtrip?
     */
    struct wl_callback *cb = wl_display_sync(d->display);
    wl_callback_add_listener(cb, &sync_listener, NULL);
    WAYLAND_wl_display_flush(d->display);
}

int Wayland_WaitEventTimeout(SDL_VideoDevice *_this, Sint64 timeoutNS)
{
    SDL_VideoData *d = _this->internal;
    SDL_WaylandSeat *seat;
    Uint64 start = SDL_GetTicksNS();
    const int display_fd = WAYLAND_wl_display_get_fd(d->display);
    int ret;
    bool poll_alarm_set = false;

#ifdef SDL_USE_IME
    SDL_Window *keyboard_focus = SDL_GetKeyboardFocus();
    if (!d->text_input_manager && keyboard_focus && SDL_TextInputActive(keyboard_focus)) {
        // If a DBus IME is active with no text input protocol, periodically wake to poll it.
        if (timeoutNS < 0 || SDL_MS_TO_NS(200) <= timeoutNS) {
            timeoutNS = SDL_MS_TO_NS(200);
            poll_alarm_set = true;
        }
    }
#endif

    // If key repeat is active, we'll need to cap our maximum wait time to handle repeats
    wl_list_for_each (seat, &d->seat_list, link) {
        if (keyboard_repeat_is_set(&seat->keyboard.repeat)) {
            const Uint64 elapsed = start - seat->keyboard.repeat.sdl_press_time_ns;
            const Uint64 next_repeat_wait_time = (seat->keyboard.repeat.next_repeat_ns - elapsed) + 1;
            if (timeoutNS < 0 || next_repeat_wait_time <= timeoutNS) {
                timeoutNS = next_repeat_wait_time;
                poll_alarm_set = true;
            }
        }
    }

    if (WAYLAND_wl_display_prepare_read(d->display) == 0) {
        if (timeoutNS > 0) {
            const Uint64 now = SDL_GetTicksNS();
            const Uint64 elapsed = now - start;
            start = now;
            timeoutNS = elapsed <= timeoutNS ? timeoutNS - elapsed : 0;
        }

        ret = WAYLAND_wl_display_flush(d->display);

        if (ret == -1 && errno == EAGAIN) {
            // Unable to write to the socket; poll until the socket can be written to, it times out, or is interrupted.
            ret = SDL_IOReady(display_fd, SDL_IOR_WRITE | SDL_IOR_NO_RETRY, timeoutNS);

            if (ret <= 0) {
                // The poll operation timed out or experienced an error, so see if there are any events to read without waiting.
                timeoutNS = 0;
            }
        }

        if (ret < 0) {
            // Pump events on an interrupt or broken pipe to handle the error.
            WAYLAND_wl_display_cancel_read(d->display);
            return errno == EINTR || errno == EPIPE ? 1 : ret;
        }

        if (timeoutNS > 0) {
            const Uint64 now = SDL_GetTicksNS();
            const Uint64 elapsed = now - start;
            start = now;
            timeoutNS = elapsed <= timeoutNS ? timeoutNS - elapsed : 0;
        }

        // Use SDL_IOR_NO_RETRY to catch EINTR.
        ret = SDL_IOReady(display_fd, SDL_IOR_READ | SDL_IOR_NO_RETRY, timeoutNS);
        if (ret <= 0) {
            // Timeout or error, cancel the read.
            WAYLAND_wl_display_cancel_read(d->display);

            // The poll timed out with no data to read, but signal the caller to pump events if polling is required.
            if (ret == 0) {
                return poll_alarm_set ? 1 : 0;
            } else {
                // Pump events on an interrupt or broken pipe to handle the error.
                return errno == EINTR || errno == EPIPE ? 1 : ret;
            }
        }

        ret = WAYLAND_wl_display_read_events(d->display);
        if (ret == -1) {
            return ret;
        }
    }

    // Signal to the caller that there might be an event available.
    return 1;
}

void Wayland_PumpEvents(SDL_VideoDevice *_this)
{
    SDL_VideoData *d = _this->internal;
    SDL_WaylandSeat *seat;
    const int display_fd = WAYLAND_wl_display_get_fd(d->display);
    int ret = 0;

#ifdef SDL_USE_IME
    SDL_Window *keyboard_focus = SDL_GetKeyboardFocus();
    if (!d->text_input_manager && keyboard_focus && SDL_TextInputActive(keyboard_focus)) {
        SDL_IME_PumpEvents();
    }
#endif

#ifdef HAVE_LIBDECOR_H
    if (d->shell.libdecor) {
        libdecor_dispatch(d->shell.libdecor, 0);
    }
#endif

    /* If the queue isn't empty, dispatch any old events, and try to prepare for reading again.
     * If preparing to read returns -1 on the second try, wl_display_read_events() enqueued new
     * events at some point between dispatching the old events and preparing for the read,
     * probably from another thread, which means that the events in the queue are current.
     */
    ret = WAYLAND_wl_display_prepare_read(d->display);
    if (ret == -1) {
        ret = WAYLAND_wl_display_dispatch_pending(d->display);
        if (ret < 0) {
            goto connection_error;
        }

        ret = WAYLAND_wl_display_prepare_read(d->display);
    }

    if (ret == 0) {
        ret = WAYLAND_wl_display_flush(d->display);

        if (ret == -1 && errno == EAGAIN) {
            // Unable to write to the socket; wait a brief time to see if it becomes writable.
            ret = SDL_IOReady(display_fd, SDL_IOR_WRITE, SDL_MS_TO_NS(4));
            if (ret > 0) {
                ret = WAYLAND_wl_display_flush(d->display);
            }
        }

        // If the compositor closed the socket, just jump to the error handler.
        if (ret < 0 && errno == EPIPE) {
            WAYLAND_wl_display_cancel_read(d->display);
            goto connection_error;
        }

        ret = SDL_IOReady(display_fd, SDL_IOR_READ, 0);
        if (ret > 0) {
            ret = WAYLAND_wl_display_read_events(d->display);
            if (ret == 0) {
                ret = WAYLAND_wl_display_dispatch_pending(d->display);
            }
        } else {
            WAYLAND_wl_display_cancel_read(d->display);
        }

    } else {
        ret = WAYLAND_wl_display_dispatch_pending(d->display);
    }

    if (ret >= 0) {
        // Synthesize key repeat events.
        wl_list_for_each (seat, &d->seat_list, link) {
            if (keyboard_repeat_is_set(&seat->keyboard.repeat)) {
                Wayland_SeatSetKeymap(seat);

                const Uint64 elapsed = SDL_GetTicksNS() - seat->keyboard.repeat.sdl_press_time_ns;
                keyboard_repeat_handle(&seat->keyboard.repeat, elapsed);
            }
        }
    }

connection_error:
    if (ret < 0) {
        Wayland_HandleDisplayDisconnected(_this);
    }
}

static void pointer_dispatch_absolute_motion(SDL_WaylandSeat *seat)
{
    SDL_WindowData *window_data = seat->pointer.focus;
    SDL_Window *window = window_data ? window_data->sdlwindow : NULL;

    if (window_data) {
        const float sx = (float)(wl_fixed_to_double(seat->pointer.pending_frame.absolute.sx) * window_data->pointer_scale.x);
        const float sy = (float)(wl_fixed_to_double(seat->pointer.pending_frame.absolute.sy) * window_data->pointer_scale.y);
        SDL_SendMouseMotion(seat->pointer.pending_frame.timestamp_ns, window_data->sdlwindow, seat->pointer.sdl_id, false, sx, sy);

        seat->pointer.last_motion.x = (int)SDL_floorf(sx);
        seat->pointer.last_motion.y = (int)SDL_floorf(sy);

        // If the pointer should be confined, but wasn't for some reason, keep trying until it is.
        if (!SDL_RectEmpty(&window->mouse_rect) && !seat->pointer.is_confined) {
            Wayland_SeatUpdatePointerGrab(seat);
        }

        if (window->hit_test) {
            SDL_HitTestResult rc = window->hit_test(window, &seat->pointer.last_motion, window->hit_test_data);

            // Apply the toplevel constraints if the window isn't resizable from those directions.
            switch (rc) {
            case SDL_HITTEST_RESIZE_TOPLEFT:
                if ((window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_TOP) &&
                    (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_LEFT)) {
                    rc = SDL_HITTEST_NORMAL;
                } else if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_TOP) {
                    rc = SDL_HITTEST_RESIZE_LEFT;
                } else if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_LEFT) {
                    rc = SDL_HITTEST_RESIZE_TOP;
                }
                break;
            case SDL_HITTEST_RESIZE_TOP:
                if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_TOP) {
                    rc = SDL_HITTEST_NORMAL;
                }
                break;
            case SDL_HITTEST_RESIZE_TOPRIGHT:
                if ((window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_TOP) &&
                    (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_RIGHT)) {
                    rc = SDL_HITTEST_NORMAL;
                } else if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_TOP) {
                    rc = SDL_HITTEST_RESIZE_RIGHT;
                } else if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_RIGHT) {
                    rc = SDL_HITTEST_RESIZE_TOP;
                }
                break;
            case SDL_HITTEST_RESIZE_RIGHT:
                if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_RIGHT) {
                    rc = SDL_HITTEST_NORMAL;
                }
                break;
            case SDL_HITTEST_RESIZE_BOTTOMRIGHT:
                if ((window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_BOTTOM) &&
                    (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_RIGHT)) {
                    rc = SDL_HITTEST_NORMAL;
                } else if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_BOTTOM) {
                    rc = SDL_HITTEST_RESIZE_RIGHT;
                } else if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_RIGHT) {
                    rc = SDL_HITTEST_RESIZE_BOTTOM;
                }
                break;
            case SDL_HITTEST_RESIZE_BOTTOM:
                if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_BOTTOM) {
                    rc = SDL_HITTEST_NORMAL;
                }
                break;
            case SDL_HITTEST_RESIZE_BOTTOMLEFT:
                if ((window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_BOTTOM) &&
                    (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_LEFT)) {
                    rc = SDL_HITTEST_NORMAL;
                } else if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_BOTTOM) {
                    rc = SDL_HITTEST_RESIZE_LEFT;
                } else if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_LEFT) {
                    rc = SDL_HITTEST_RESIZE_BOTTOM;
                }
                break;
            case SDL_HITTEST_RESIZE_LEFT:
                if (window_data->toplevel_constraints & WAYLAND_TOPLEVEL_CONSTRAINED_LEFT) {
                    rc = SDL_HITTEST_NORMAL;
                }
                break;
            default:
                break;
            }

            if (rc != window_data->hit_test_result) {
                window_data->hit_test_result = rc;
                Wayland_SeatUpdatePointerCursor(seat);
            }
        }
    }
}

static void pointer_handle_motion(void *data, struct wl_pointer *pointer,
                                  uint32_t time, wl_fixed_t sx, wl_fixed_t sy)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;

    seat->pointer.pending_frame.have_absolute = true;
    seat->pointer.pending_frame.absolute.sx = sx;
    seat->pointer.pending_frame.absolute.sy = sy;

    /* The relative pointer timestamp is higher resolution than the default millisecond timestamp,
     * but lower than the highres timestamp. Use the best timer available for this frame, but still
     * process the pending millisecond timestamp to update the offset value for other events.
     */
    const Uint64 timestamp = Wayland_GetPointerTimestamp(seat, time);
    if (!seat->pointer.pending_frame.have_relative || seat->pointer.timestamps) {
        seat->pointer.pending_frame.timestamp_ns = timestamp;
    }

    if (wl_pointer_get_version(seat->pointer.wl_pointer) < WL_POINTER_FRAME_SINCE_VERSION) {
        pointer_dispatch_absolute_motion(seat);
    }
}

static void pointer_handle_enter(void *data, struct wl_pointer *pointer,
                                 uint32_t serial, struct wl_surface *surface,
                                 wl_fixed_t sx_w, wl_fixed_t sy_w)
{
    if (!surface) {
        // Enter event for a destroyed surface.
        return;
    }

    SDL_WindowData *window = Wayland_GetWindowDataForOwnedSurface(surface);
    if (!window) {
        // Not a surface owned by SDL.
        return;
    }

    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    seat->pointer.focus = window;
    seat->pointer.enter_serial = serial;
    ++window->pointer_focus_count;
    SDL_SetMouseFocus(window->sdlwindow);

    /* In the case of e.g. a pointer confine warp, we may receive an enter
     * event with no following motion event, but with the new coordinates
     * as part of the enter event.
     *
     * If another event with a real timestamp is part of this frame, use it.
     * Otherwise, set it to 0 to use the current system timer.
     */
    if (!seat->pointer.pending_frame.have_absolute &&
        !seat->pointer.pending_frame.have_relative &&
        !seat->pointer.pending_frame.have_axis) {
        seat->pointer.pending_frame.timestamp_ns = 0;
    }
    seat->pointer.pending_frame.absolute.sx = sx_w;
    seat->pointer.pending_frame.absolute.sy = sy_w;

    seat->pointer.pending_frame.have_absolute = true;
    seat->pointer.pending_frame.have_enter = true;

    if (wl_pointer_get_version(seat->pointer.wl_pointer) < WL_POINTER_FRAME_SINCE_VERSION) {
        pointer_dispatch_absolute_motion(seat);

        // Update the pointer grab state.
        Wayland_SeatUpdatePointerGrab(seat);

        /* If the cursor was changed while our window didn't have pointer
         * focus, we might need to trigger another call to
         * wl_pointer_set_cursor() for the new cursor to be displayed.
         *
         * This will also update the cursor if a second pointer entered a
         * window that already has focus, as the focus change sequence
         * won't be run.
         */
        Wayland_SeatUpdatePointerCursor(seat);
    }
}

static void pointer_handle_leave(void *data, struct wl_pointer *pointer,
                                 uint32_t serial, struct wl_surface *surface)
{
    if (!surface) {
        // Leave event for a destroyed surface.
        return;
    }

    SDL_WindowData *window = Wayland_GetWindowDataForOwnedSurface(surface);
    if (!window) {
        // Not a surface owned by SDL.
        return;
    }

    // Clear the capture flag and raise all buttons
    window->sdlwindow->flags &= ~SDL_WINDOW_MOUSE_CAPTURE;

    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    seat->pointer.focus = NULL;
    for (int i = 0; seat->pointer.buttons_pressed; ++i) {
        if (seat->pointer.buttons_pressed & SDL_BUTTON_MASK(i)) {
            SDL_SendMouseButton(0, window->sdlwindow, seat->pointer.sdl_id, i, false);
            seat->pointer.buttons_pressed &= ~SDL_BUTTON_MASK(i);
        }
    }

    /* A pointer leave event may be emitted if the compositor hides the pointer in response to receiving a touch event.
     * Don't relinquish focus if the surface has active touches, as the compositor is just transitioning from mouse to touch mode.
     */
    SDL_Window *mouse_focus = SDL_GetMouseFocus();
    const bool had_focus = mouse_focus && window->sdlwindow == mouse_focus;
    if (!--window->pointer_focus_count && had_focus && !window->active_touch_count) {
        SDL_SetMouseFocus(NULL);
    }

    Wayland_SeatUpdatePointerGrab(seat);
    Wayland_SeatUpdatePointerCursor(seat);
}

static bool Wayland_ProcessHitTest(SDL_WaylandSeat *seat, Uint32 serial)
{
    // Pointer is immobilized, do nothing.
    if (seat->pointer.locked_pointer) {
        return false;
    }

    SDL_WindowData *window_data = seat->pointer.focus;
    SDL_Window *window = window_data->sdlwindow;

    if (window->hit_test) {
        static const uint32_t directions[] = {
            XDG_TOPLEVEL_RESIZE_EDGE_TOP_LEFT, XDG_TOPLEVEL_RESIZE_EDGE_TOP,
            XDG_TOPLEVEL_RESIZE_EDGE_TOP_RIGHT, XDG_TOPLEVEL_RESIZE_EDGE_RIGHT,
            XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_RIGHT, XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM,
            XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_LEFT, XDG_TOPLEVEL_RESIZE_EDGE_LEFT
        };

#ifdef HAVE_LIBDECOR_H
        static const uint32_t directions_libdecor[] = {
            LIBDECOR_RESIZE_EDGE_TOP_LEFT, LIBDECOR_RESIZE_EDGE_TOP,
            LIBDECOR_RESIZE_EDGE_TOP_RIGHT, LIBDECOR_RESIZE_EDGE_RIGHT,
            LIBDECOR_RESIZE_EDGE_BOTTOM_RIGHT, LIBDECOR_RESIZE_EDGE_BOTTOM,
            LIBDECOR_RESIZE_EDGE_BOTTOM_LEFT, LIBDECOR_RESIZE_EDGE_LEFT
        };
#endif

        switch (window_data->hit_test_result) {
        case SDL_HITTEST_DRAGGABLE:
#ifdef HAVE_LIBDECOR_H
            if (window_data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
                if (window_data->shell_surface.libdecor.frame) {
                    libdecor_frame_move(window_data->shell_surface.libdecor.frame,
                                        seat->wl_seat,
                                        serial);
                }
            } else
#endif
                if (window_data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
                if (window_data->shell_surface.xdg.toplevel.xdg_toplevel) {
                    xdg_toplevel_move(window_data->shell_surface.xdg.toplevel.xdg_toplevel,
                                      seat->wl_seat,
                                      serial);
                }
            }
            return true;

        case SDL_HITTEST_RESIZE_TOPLEFT:
        case SDL_HITTEST_RESIZE_TOP:
        case SDL_HITTEST_RESIZE_TOPRIGHT:
        case SDL_HITTEST_RESIZE_RIGHT:
        case SDL_HITTEST_RESIZE_BOTTOMRIGHT:
        case SDL_HITTEST_RESIZE_BOTTOM:
        case SDL_HITTEST_RESIZE_BOTTOMLEFT:
        case SDL_HITTEST_RESIZE_LEFT:
#ifdef HAVE_LIBDECOR_H
            if (window_data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
                if (window_data->shell_surface.libdecor.frame) {
                    libdecor_frame_resize(window_data->shell_surface.libdecor.frame,
                                          seat->wl_seat,
                                          serial,
                                          directions_libdecor[window_data->hit_test_result - SDL_HITTEST_RESIZE_TOPLEFT]);
                }
            } else
#endif
                if (window_data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
                if (window_data->shell_surface.xdg.toplevel.xdg_toplevel) {
                    xdg_toplevel_resize(window_data->shell_surface.xdg.toplevel.xdg_toplevel,
                                        seat->wl_seat,
                                        serial,
                                        directions[window_data->hit_test_result - SDL_HITTEST_RESIZE_TOPLEFT]);
                }
            }
            return true;

        default:
            return false;
        }
    }

    return false;
}

static void pointer_handle_button_common(SDL_WaylandSeat *seat, uint32_t serial,
                                         Uint64 nsTimestamp, uint32_t button, uint32_t state_w)
{
    SDL_WindowData *window = seat->pointer.focus;
    enum wl_pointer_button_state state = state_w;
    Uint8 sdl_button;
    const bool down = (state != 0);

    switch (button) {
    case BTN_LEFT:
        sdl_button = SDL_BUTTON_LEFT;
        break;
    case BTN_MIDDLE:
        sdl_button = SDL_BUTTON_MIDDLE;
        break;
    case BTN_RIGHT:
        sdl_button = SDL_BUTTON_RIGHT;
        break;
    default:
        sdl_button = SDL_BUTTON_X1 + (button - BTN_SIDE);
        break;
    }

    if (window) {
        bool ignore_click = false;

        if (state) {
            Wayland_UpdateImplicitGrabSerial(seat, serial);
            seat->pointer.buttons_pressed |= SDL_BUTTON_MASK(sdl_button);
        } else {
            seat->pointer.buttons_pressed &= ~(SDL_BUTTON_MASK(sdl_button));
        }

        if (sdl_button == SDL_BUTTON_LEFT && Wayland_ProcessHitTest(seat, serial)) {
            return; // don't pass this event on to app.
        }

        // Possibly ignore this click if it was to gain focus.
        if (window->last_focus_event_time_ns) {
            if (state == WL_POINTER_BUTTON_STATE_PRESSED &&
                (SDL_GetTicksNS() - window->last_focus_event_time_ns) < WAYLAND_FOCUS_CLICK_TIMEOUT_NS) {
                ignore_click = !SDL_GetHintBoolean(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, false);
            }

            window->last_focus_event_time_ns = 0;
        }

        /* Wayland won't let you "capture" the mouse, but it will automatically track
         * the mouse outside the window if you drag outside of it, until you let go
         * of all buttons (even if you add or remove presses outside the window, as
         * long as any button is still down, the capture remains).
         *
         * The mouse is not captured in relative mode.
         */
        if (!seat->pointer.relative_pointer) {
            if (seat->pointer.buttons_pressed != 0) {
                window->sdlwindow->flags |= SDL_WINDOW_MOUSE_CAPTURE;
            } else {
                window->sdlwindow->flags &= ~SDL_WINDOW_MOUSE_CAPTURE;
            }
        }

        if (!ignore_click) {
            SDL_SendMouseButton(nsTimestamp, window->sdlwindow, seat->pointer.sdl_id, sdl_button, down);
        }
    }
}

static void pointer_handle_button(void *data, struct wl_pointer *pointer, uint32_t serial,
                                  uint32_t time, uint32_t button, uint32_t state_w)
{
    SDL_WaylandSeat *seat = data;
    pointer_handle_button_common(seat, serial, Wayland_GetPointerTimestamp(seat, time), button, state_w);
}

static void pointer_handle_axis_common_v1(SDL_WaylandSeat *seat,
                                          Uint64 nsTimestamp, uint32_t axis, wl_fixed_t value)
{
    SDL_WindowData *window = seat->pointer.focus;
    const enum wl_pointer_axis a = axis;

    if (seat->pointer.focus) {
        float x, y;

        switch (a) {
        case WL_POINTER_AXIS_VERTICAL_SCROLL:
            x = 0;
            y = 0 - (float)wl_fixed_to_double(value);
            break;
        case WL_POINTER_AXIS_HORIZONTAL_SCROLL:
            x = (float)wl_fixed_to_double(value);
            y = 0;
            break;
        default:
            return;
        }

        x /= WAYLAND_WHEEL_AXIS_UNIT;
        y /= WAYLAND_WHEEL_AXIS_UNIT;

        SDL_SendMouseWheel(nsTimestamp, window->sdlwindow, seat->pointer.sdl_id, x, y, SDL_MOUSEWHEEL_NORMAL);
    }
}

static void pointer_handle_axis_common(SDL_WaylandSeat *seat, enum SDL_WaylandAxisEvent type,
                                       uint32_t axis, wl_fixed_t value)
{
    const enum wl_pointer_axis a = axis;

    if (seat->pointer.focus) {
        seat->pointer.pending_frame.have_axis = true;

        switch (a) {
        case WL_POINTER_AXIS_VERTICAL_SCROLL:
            switch (type) {
            case SDL_WAYLAND_AXIS_EVENT_VALUE120:
                /*
                 * High resolution scroll event. The spec doesn't state that axis_value120
                 * events are limited to one per frame, so the values are accumulated.
                 */
                if (seat->pointer.pending_frame.axis.y_axis_type != SDL_WAYLAND_AXIS_EVENT_VALUE120) {
                    seat->pointer.pending_frame.axis.y_axis_type = SDL_WAYLAND_AXIS_EVENT_VALUE120;
                    seat->pointer.pending_frame.axis.y = 0.0f;
                }
                seat->pointer.pending_frame.axis.y += 0 - (float)wl_fixed_to_double(value);
                break;
            case SDL_WAYLAND_AXIS_EVENT_DISCRETE:
                /*
                 * This is a discrete axis event, so we process it and set the
                 * flag to ignore future continuous axis events in this frame.
                 */
                if (seat->pointer.pending_frame.axis.y_axis_type != SDL_WAYLAND_AXIS_EVENT_DISCRETE) {
                    seat->pointer.pending_frame.axis.y_axis_type = SDL_WAYLAND_AXIS_EVENT_DISCRETE;
                    seat->pointer.pending_frame.axis.y = 0 - (float)wl_fixed_to_double(value);
                }
                break;
            case SDL_WAYLAND_AXIS_EVENT_CONTINUOUS:
                // Only process continuous events if no discrete events have been received.
                if (seat->pointer.pending_frame.axis.y_axis_type == SDL_WAYLAND_AXIS_EVENT_CONTINUOUS) {
                    seat->pointer.pending_frame.axis.y = 0 - (float)wl_fixed_to_double(value);
                }
                break;
            }
            break;
        case WL_POINTER_AXIS_HORIZONTAL_SCROLL:
            switch (type) {
            case SDL_WAYLAND_AXIS_EVENT_VALUE120:
                /*
                 * High resolution scroll event. The spec doesn't state that axis_value120
                 * events are limited to one per frame, so the values are accumulated.
                 */
                if (seat->pointer.pending_frame.axis.x_axis_type != SDL_WAYLAND_AXIS_EVENT_VALUE120) {
                    seat->pointer.pending_frame.axis.x_axis_type = SDL_WAYLAND_AXIS_EVENT_VALUE120;
                    seat->pointer.pending_frame.axis.x = 0.0f;
                }
                seat->pointer.pending_frame.axis.x += (float)wl_fixed_to_double(value);
                break;
            case SDL_WAYLAND_AXIS_EVENT_DISCRETE:
                /*
                 * This is a discrete axis event, so we process it and set the
                 * flag to ignore future continuous axis events in this frame.
                 */
                if (seat->pointer.pending_frame.axis.x_axis_type != SDL_WAYLAND_AXIS_EVENT_DISCRETE) {
                    seat->pointer.pending_frame.axis.x_axis_type = SDL_WAYLAND_AXIS_EVENT_DISCRETE;
                    seat->pointer.pending_frame.axis.x = (float)wl_fixed_to_double(value);
                }
                break;
            case SDL_WAYLAND_AXIS_EVENT_CONTINUOUS:
                // Only process continuous events if no discrete events have been received.
                if (seat->pointer.pending_frame.axis.x_axis_type == SDL_WAYLAND_AXIS_EVENT_CONTINUOUS) {
                    seat->pointer.pending_frame.axis.x = (float)wl_fixed_to_double(value);
                }
                break;
            }
            break;
        }
    }
}

static void pointer_handle_axis(void *data, struct wl_pointer *pointer,
                                uint32_t time, uint32_t axis, wl_fixed_t value)
{
    SDL_WaylandSeat *seat = data;
    const Uint64 nsTimestamp = Wayland_GetPointerTimestamp(seat, time);

    if (wl_seat_get_version(seat->wl_seat) >= WL_POINTER_FRAME_SINCE_VERSION) {
        seat->pointer.pending_frame.timestamp_ns = nsTimestamp;
        pointer_handle_axis_common(seat, SDL_WAYLAND_AXIS_EVENT_CONTINUOUS, axis, value);
    } else {
        pointer_handle_axis_common_v1(seat, nsTimestamp, axis, value);
    }
}

static void pointer_handle_axis_relative_direction(void *data, struct wl_pointer *pointer,
                                                   uint32_t axis, uint32_t axis_relative_direction)
{
    SDL_WaylandSeat *seat = data;
    if (axis != WL_POINTER_AXIS_VERTICAL_SCROLL) {
        return;
    }
    switch (axis_relative_direction) {
    case WL_POINTER_AXIS_RELATIVE_DIRECTION_IDENTICAL:
        seat->pointer.pending_frame.axis.direction = SDL_MOUSEWHEEL_NORMAL;
        break;
    case WL_POINTER_AXIS_RELATIVE_DIRECTION_INVERTED:
        seat->pointer.pending_frame.axis.direction = SDL_MOUSEWHEEL_FLIPPED;
        break;
    }
}

static void pointer_dispatch_relative_motion(SDL_WaylandSeat *seat)
{
    SDL_WindowData *window = seat->pointer.focus;
    SDL_Mouse *mouse = SDL_GetMouse();

    double dx;
    double dy;
    if (mouse->InputTransform || !mouse->enable_relative_system_scale) {
        dx = wl_fixed_to_double(seat->pointer.pending_frame.relative.dx_unaccel);
        dy = wl_fixed_to_double(seat->pointer.pending_frame.relative.dy_unaccel);
    } else {
        dx = wl_fixed_to_double(seat->pointer.pending_frame.relative.dx) * window->pointer_scale.x;
        dy = wl_fixed_to_double(seat->pointer.pending_frame.relative.dy) * window->pointer_scale.y;
    }

    SDL_SendMouseMotion(seat->pointer.pending_frame.timestamp_ns, window->sdlwindow, seat->pointer.sdl_id, true, (float)dx, (float)dy);
}

static void pointer_dispatch_axis(SDL_WaylandSeat *seat)
{
    float x, y;
    SDL_MouseWheelDirection direction = seat->pointer.pending_frame.axis.direction;

    switch (seat->pointer.pending_frame.axis.x_axis_type) {
    case SDL_WAYLAND_AXIS_EVENT_CONTINUOUS:
        x = seat->pointer.pending_frame.axis.x / WAYLAND_WHEEL_AXIS_UNIT;
        break;
    case SDL_WAYLAND_AXIS_EVENT_DISCRETE:
        x = seat->pointer.pending_frame.axis.x;
        break;
    case SDL_WAYLAND_AXIS_EVENT_VALUE120:
        x = seat->pointer.pending_frame.axis.x / 120.0f;
        break;
    default:
        x = 0.0f;
        break;
    }

    switch (seat->pointer.pending_frame.axis.y_axis_type) {
    case SDL_WAYLAND_AXIS_EVENT_CONTINUOUS:
        y = seat->pointer.pending_frame.axis.y / WAYLAND_WHEEL_AXIS_UNIT;
        break;
    case SDL_WAYLAND_AXIS_EVENT_DISCRETE:
        y = seat->pointer.pending_frame.axis.y;
        break;
    case SDL_WAYLAND_AXIS_EVENT_VALUE120:
        y = seat->pointer.pending_frame.axis.y / 120.0f;
        break;
    default:
        y = 0.0f;
        break;
    }

    SDL_SendMouseWheel(seat->pointer.pending_frame.timestamp_ns,
                       seat->pointer.focus->sdlwindow, seat->pointer.sdl_id, x, y, direction);
}

static void pointer_handle_frame(void *data, struct wl_pointer *pointer)
{
    SDL_WaylandSeat *seat = data;

    if (seat->pointer.pending_frame.have_absolute) {
        pointer_dispatch_absolute_motion(seat);

        if (seat->pointer.pending_frame.have_enter) {
            // Update the pointer grab state.
            Wayland_SeatUpdatePointerGrab(seat);

            /* If the cursor was changed while our window didn't have pointer
             * focus, we might need to trigger another call to
             * wl_pointer_set_cursor() for the new cursor to be displayed.
             *
             * This will also update the cursor if a second pointer entered a
             * window that already has focus, as the focus change sequence
             * won't be run.
             */
            Wayland_SeatUpdatePointerCursor(seat);
        }
    }

    if (seat->pointer.pending_frame.have_relative) {
        pointer_dispatch_relative_motion(seat);
    }

    if (seat->pointer.pending_frame.have_axis) {
        pointer_dispatch_axis(seat);
    }

    SDL_zero(seat->pointer.pending_frame);
}

static void pointer_handle_axis_source(void *data, struct wl_pointer *pointer,
                                       uint32_t axis_source)
{
    // unimplemented
}

static void pointer_handle_axis_stop(void *data, struct wl_pointer *pointer,
                                     uint32_t time, uint32_t axis)
{
    // unimplemented
}

static void pointer_handle_axis_discrete(void *data, struct wl_pointer *pointer,
                                         uint32_t axis, int32_t discrete)
{
    SDL_WaylandSeat *seat = data;

    pointer_handle_axis_common(seat, SDL_WAYLAND_AXIS_EVENT_DISCRETE, axis, wl_fixed_from_int(discrete));
}

static void pointer_handle_axis_value120(void *data, struct wl_pointer *pointer,
                                         uint32_t axis, int32_t value120)
{
    SDL_WaylandSeat *seat = data;

    pointer_handle_axis_common(seat, SDL_WAYLAND_AXIS_EVENT_VALUE120, axis, wl_fixed_from_int(value120));
}

static const struct wl_pointer_listener pointer_listener = {
    pointer_handle_enter,
    pointer_handle_leave,
    pointer_handle_motion,
    pointer_handle_button,
    pointer_handle_axis,
    pointer_handle_frame,                  // Version 5
    pointer_handle_axis_source,            // Version 5
    pointer_handle_axis_stop,              // Version 5
    pointer_handle_axis_discrete,          // Version 5
    pointer_handle_axis_value120,          // Version 8
    pointer_handle_axis_relative_direction // Version 9
};

static void relative_pointer_handle_relative_motion(void *data,
                                                    struct zwp_relative_pointer_v1 *pointer,
                                                    uint32_t time_hi,
                                                    uint32_t time_lo,
                                                    wl_fixed_t dx,
                                                    wl_fixed_t dy,
                                                    wl_fixed_t dx_unaccel,
                                                    wl_fixed_t dy_unaccel)
{
    SDL_WaylandSeat *seat = data;

    // Relative pointer event times are in microsecond granularity.
    seat->pointer.pending_frame.have_relative = true;
    seat->pointer.pending_frame.relative.dx = dx;
    seat->pointer.pending_frame.relative.dy = dy;
    seat->pointer.pending_frame.relative.dx_unaccel = dx_unaccel;
    seat->pointer.pending_frame.relative.dy_unaccel = dy_unaccel;
    seat->pointer.pending_frame.timestamp_ns = Wayland_AdjustEventTimestampBase(SDL_US_TO_NS(((Uint64)time_hi << 32) | (Uint64)time_lo));

    if (wl_pointer_get_version(seat->pointer.wl_pointer) < WL_POINTER_FRAME_SINCE_VERSION) {
        pointer_dispatch_relative_motion(seat);
    }
}

static const struct zwp_relative_pointer_v1_listener relative_pointer_listener = {
    relative_pointer_handle_relative_motion,
};

static void locked_pointer_locked(void *data, struct zwp_locked_pointer_v1 *locked_pointer)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    seat->pointer.is_confined = true;
}

static void locked_pointer_unlocked(void *data, struct zwp_locked_pointer_v1 *locked_pointer)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    seat->pointer.is_confined = false;
}

static const struct zwp_locked_pointer_v1_listener locked_pointer_listener = {
    locked_pointer_locked,
    locked_pointer_unlocked,
};

static void confined_pointer_confined(void *data, struct zwp_confined_pointer_v1 *confined_pointer)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    seat->pointer.is_confined = true;
}

static void confined_pointer_unconfined(void *data, struct zwp_confined_pointer_v1 *confined_pointer)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    seat->pointer.is_confined = false;
}

static const struct zwp_confined_pointer_v1_listener confined_pointer_listener = {
    confined_pointer_confined,
    confined_pointer_unconfined,
};

static void touch_handler_down(void *data, struct wl_touch *touch, uint32_t serial,
                               uint32_t timestamp, struct wl_surface *surface,
                               int id, wl_fixed_t fx, wl_fixed_t fy)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    SDL_WindowData *window_data;

    // Check that this surface is valid.
    if (!surface) {
        return;
    }

    Wayland_SeatAddTouch(seat, id, fx, fy, surface);
    Wayland_UpdateImplicitGrabSerial(seat, serial);
    window_data = Wayland_GetWindowDataForOwnedSurface(surface);

    if (window_data) {
        float x, y;

        if (window_data->current.logical_width <= 1) {
            x = 0.5f;
        } else {
            x = (float)wl_fixed_to_double(fx) / (window_data->current.logical_width - 1);
        }
        if (window_data->current.logical_height <= 1) {
            y = 0.5f;
        } else {
            y = (float)wl_fixed_to_double(fy) / (window_data->current.logical_height - 1);
        }

        ++window_data->active_touch_count;
        SDL_SetMouseFocus(window_data->sdlwindow);

        SDL_SendTouch(Wayland_GetTouchTimestamp(seat, timestamp), (SDL_TouchID)(uintptr_t)touch,
                      (SDL_FingerID)(id + 1), window_data->sdlwindow, SDL_EVENT_FINGER_DOWN, x, y, 1.0f);
    }
}

static void touch_handler_up(void *data, struct wl_touch *touch, uint32_t serial,
                             uint32_t timestamp, int id)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    wl_fixed_t fx = 0, fy = 0;
    struct wl_surface *surface = NULL;

    Wayland_SeatRemoveTouch(seat, id, &fx, &fy, &surface);

    if (surface) {
        SDL_WindowData *window_data = (SDL_WindowData *)wl_surface_get_user_data(surface);

        if (window_data) {
            const float x = (float)wl_fixed_to_double(fx) / window_data->current.logical_width;
            const float y = (float)wl_fixed_to_double(fy) / window_data->current.logical_height;

            SDL_SendTouch(Wayland_GetTouchTimestamp(seat, timestamp), (SDL_TouchID)(uintptr_t)touch,
                          (SDL_FingerID)(id + 1), window_data->sdlwindow, SDL_EVENT_FINGER_UP, x, y, 0.0f);

            --window_data->active_touch_count;

            /* If the window currently has mouse focus and has no currently active keyboards, pointers,
             * or touch events, then consider mouse focus to be lost.
             */
            if (SDL_GetMouseFocus() == window_data->sdlwindow && !window_data->keyboard_focus_count &&
                !window_data->pointer_focus_count && !window_data->active_touch_count) {
                SDL_SetMouseFocus(NULL);
            }
        }
    }
}

static void touch_handler_motion(void *data, struct wl_touch *touch, uint32_t timestamp,
                                 int id, wl_fixed_t fx, wl_fixed_t fy)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    struct wl_surface *surface = NULL;

    Wayland_SeatUpdateTouch(seat, id, fx, fy, &surface);

    if (surface) {
        SDL_WindowData *window_data = (SDL_WindowData *)wl_surface_get_user_data(surface);

        if (window_data) {
            const float x = (float)wl_fixed_to_double(fx) / window_data->current.logical_width;
            const float y = (float)wl_fixed_to_double(fy) / window_data->current.logical_height;

            SDL_SendTouchMotion(Wayland_GetTouchTimestamp(seat, timestamp), (SDL_TouchID)(uintptr_t)touch,
                                (SDL_FingerID)(id + 1), window_data->sdlwindow, x, y, 1.0f);
        }
    }
}

static void touch_handler_frame(void *data, struct wl_touch *touch)
{
}

static void touch_handler_cancel(void *data, struct wl_touch *touch)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    SDL_WaylandTouchPoint *tp, *temp;

    // Need the safe loop variant here as cancelling a touch point removes it from the list.
    wl_list_for_each_safe (tp, temp, &seat->touch.points, link) {
        Wayland_SeatCancelTouch(seat, tp);
    }
}

static void touch_handler_shape(void *data, struct wl_touch *wl_touch, int32_t id, wl_fixed_t major, wl_fixed_t minor)
{
}

static void touch_handler_orientation(void *data, struct wl_touch *wl_touch, int32_t id, wl_fixed_t orientation)
{
}

static const struct wl_touch_listener touch_listener = {
    touch_handler_down,
    touch_handler_up,
    touch_handler_motion,
    touch_handler_frame,
    touch_handler_cancel,
    touch_handler_shape,      // Version 6
    touch_handler_orientation // Version 6
};

// Fallback for xkb_keymap_key_get_mods_for_level(), which is only available from 1.0.0, while the SDL minimum is 0.5.0.
#if !SDL_XKBCOMMON_CHECK_VERSION(1, 0, 0)
static size_t xkb_legacy_get_mods_for_level(SDL_WaylandSeat *seat, xkb_keycode_t key, xkb_layout_index_t layout, xkb_level_index_t level, xkb_mod_mask_t *masks_out, size_t masks_size)
{
    if (!masks_out || !masks_size) {
        return 0;
    }

    // Level 0 is always unmodified, so early out.
    if (level == 0) {
        *masks_out = 0;
        return 1;
    }

    size_t mask_idx = 0;
    const xkb_mod_mask_t keymod_masks[] = {
        0,
        seat->keyboard.xkb.shift_mask,
        seat->keyboard.xkb.caps_mask,
        seat->keyboard.xkb.shift_mask | seat->keyboard.xkb.caps_mask,
        seat->keyboard.xkb.level3_mask,
        seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.shift_mask,
        seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.caps_mask,
        seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.shift_mask | seat->keyboard.xkb.caps_mask,
        seat->keyboard.xkb.level5_mask,
        seat->keyboard.xkb.level5_mask | seat->keyboard.xkb.shift_mask,
        seat->keyboard.xkb.level5_mask | seat->keyboard.xkb.caps_mask,
        seat->keyboard.xkb.level5_mask | seat->keyboard.xkb.shift_mask | seat->keyboard.xkb.caps_mask
    };
    const xkb_mod_mask_t pressed_mod_mask = seat->keyboard.xkb.shift_mask | seat->keyboard.xkb.level3_mask | seat->keyboard.xkb.level5_mask;
    const xkb_mod_mask_t locked_mod_mask = seat->keyboard.xkb.caps_mask;

    for (size_t i = 0; i < SDL_arraysize(keymod_masks); ++i) {
        WAYLAND_xkb_state_update_mask(seat->keyboard.xkb.state, keymod_masks[i] & pressed_mod_mask, 0, keymod_masks[i] & locked_mod_mask, 0, 0, layout);
        if (WAYLAND_xkb_state_key_get_level(seat->keyboard.xkb.state, key, layout) == level) {
            masks_out[mask_idx] = keymod_masks[i];

            if (++mask_idx == masks_size) {
                break;
            }
        }
    }

    return mask_idx;
}
#endif

static void Wayland_KeymapIterator(struct xkb_keymap *keymap, xkb_keycode_t key, void *data)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    const xkb_keysym_t *syms;
    const xkb_mod_mask_t xkb_valid_mod_mask = seat->keyboard.xkb.shift_mask |
                                              seat->keyboard.xkb.alt_mask |
                                              seat->keyboard.xkb.gui_mask |
                                              seat->keyboard.xkb.level3_mask |
                                              seat->keyboard.xkb.level5_mask |
                                              seat->keyboard.xkb.caps_mask;
    SDL_Scancode scancode = SDL_SCANCODE_UNKNOWN;

    // Look up the scancode for hardware keyboards. Virtual keyboards get the scancode from the keysym.
    if (!seat->keyboard.is_virtual) {
        scancode = SDL_GetScancodeFromTable(SDL_SCANCODE_TABLE_XFREE86_2, (key - 8));
        if (scancode == SDL_SCANCODE_UNKNOWN) {
            return;
        }
    }

    for (xkb_layout_index_t layout = 0; layout < seat->keyboard.xkb.num_layouts; ++layout) {
        const xkb_level_index_t num_levels = WAYLAND_xkb_keymap_num_levels_for_key(seat->keyboard.xkb.keymap, key, layout);
        for (xkb_level_index_t level = 0; level < num_levels; ++level) {
            if (WAYLAND_xkb_keymap_key_get_syms_by_level(seat->keyboard.xkb.keymap, key, layout, level, &syms) > 0) {
                /* If the keyboard is virtual or the key didn't have a corresponding hardware scancode, try to
                 * look it up from the keysym. If there is still no corresponding scancode, skip this mapping
                 * for now, as it will be dynamically added with a reserved scancode on first use.
                 */
                if (scancode == SDL_SCANCODE_UNKNOWN) {
                    scancode = SDL_GetScancodeFromKeySym(syms[0], key);
                    if (scancode == SDL_SCANCODE_UNKNOWN) {
                        continue;
                    }
                }

                xkb_mod_mask_t xkb_mod_masks[16];
#if SDL_XKBCOMMON_CHECK_VERSION(1, 0, 0)
                const size_t num_masks = WAYLAND_xkb_keymap_key_get_mods_for_level(seat->keyboard.xkb.keymap, key, layout, level, xkb_mod_masks, SDL_arraysize(xkb_mod_masks));
#else
                const size_t num_masks = xkb_legacy_get_mods_for_level(seat, key, layout, level, xkb_mod_masks, SDL_arraysize(xkb_mod_masks));
#endif
                for (size_t mask = 0; mask < num_masks; ++mask) {
                    // Ignore this modifier set if it uses unsupported modifier types.
                    if ((xkb_mod_masks[mask] | xkb_valid_mod_mask) != xkb_valid_mod_mask) {
                        continue;
                    }

                    const SDL_Keymod sdl_mod = (xkb_mod_masks[mask] & seat->keyboard.xkb.shift_mask ? SDL_KMOD_SHIFT : 0) |
                                               (xkb_mod_masks[mask] & seat->keyboard.xkb.alt_mask ? SDL_KMOD_ALT : 0) |
                                               (xkb_mod_masks[mask] & seat->keyboard.xkb.gui_mask ? SDL_KMOD_GUI : 0) |
                                               (xkb_mod_masks[mask] & seat->keyboard.xkb.level3_mask ? SDL_KMOD_MODE : 0) |
                                               (xkb_mod_masks[mask] & seat->keyboard.xkb.level5_mask ? SDL_KMOD_LEVEL5 : 0) |
                                               (xkb_mod_masks[mask] & seat->keyboard.xkb.caps_mask ? SDL_KMOD_CAPS : 0);

                    SDL_Keycode keycode = SDL_GetKeyCodeFromKeySym(syms[0], key, sdl_mod);

                    if (!keycode) {
                        switch (scancode) {
                        case SDL_SCANCODE_RETURN:
                            keycode = SDLK_RETURN;
                            break;
                        case SDL_SCANCODE_ESCAPE:
                            keycode = SDLK_ESCAPE;
                            break;
                        case SDL_SCANCODE_BACKSPACE:
                            keycode = SDLK_BACKSPACE;
                            break;
                        case SDL_SCANCODE_DELETE:
                            keycode = SDLK_DELETE;
                            break;
                        default:
                            keycode = SDL_SCANCODE_TO_KEYCODE(scancode);
                            break;
                        }
                    }

                    SDL_SetKeymapEntry(seat->keyboard.sdl_keymap[layout], scancode, sdl_mod, keycode);
                }
            }
        }
    }
}

static void keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
                                   uint32_t format, int fd, uint32_t size)
{
    SDL_WaylandSeat *seat = data;
    char *map_str;

    if (!data) {
        close(fd);
        return;
    }

    if (format != WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1) {
        close(fd);
        return;
    }

    map_str = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
    if (map_str == MAP_FAILED) {
        close(fd);
        return;
    }

    if (seat->keyboard.xkb.keymap != NULL) {
        /* if there's already a keymap loaded, throw it away rather than leaking it before
         * parsing the new one
         */
        WAYLAND_xkb_keymap_unref(seat->keyboard.xkb.keymap);
        seat->keyboard.xkb.keymap = NULL;
    }
    seat->keyboard.xkb.keymap = WAYLAND_xkb_keymap_new_from_string(seat->display->xkb_context,
                                                                   map_str,
                                                                   XKB_KEYMAP_FORMAT_TEXT_V1,
                                                                   0);
    munmap(map_str, size);
    close(fd);

    if (!seat->keyboard.xkb.keymap) {
        SDL_SetError("failed to compile keymap");
        return;
    }

    // Clear the old layouts.
    for (xkb_layout_index_t i = 0; i < seat->keyboard.xkb.num_layouts; ++i) {
        SDL_DestroyKeymap(seat->keyboard.sdl_keymap[i]);
    }
    SDL_free(seat->keyboard.sdl_keymap);
    seat->keyboard.sdl_keymap = NULL;
    seat->keyboard.xkb.num_layouts = 0;

#if SDL_XKBCOMMON_CHECK_VERSION(1, 10, 0)
    seat->keyboard.xkb.shift_mask = WAYLAND_xkb_keymap_mod_get_mask(seat->keyboard.xkb.keymap, XKB_MOD_NAME_SHIFT);
    seat->keyboard.xkb.ctrl_mask = WAYLAND_xkb_keymap_mod_get_mask(seat->keyboard.xkb.keymap, XKB_MOD_NAME_CTRL);
    seat->keyboard.xkb.alt_mask = WAYLAND_xkb_keymap_mod_get_mask(seat->keyboard.xkb.keymap, XKB_VMOD_NAME_ALT);
    seat->keyboard.xkb.gui_mask = WAYLAND_xkb_keymap_mod_get_mask(seat->keyboard.xkb.keymap, XKB_VMOD_NAME_SUPER);
    seat->keyboard.xkb.level3_mask = WAYLAND_xkb_keymap_mod_get_mask(seat->keyboard.xkb.keymap, XKB_VMOD_NAME_LEVEL3);
    seat->keyboard.xkb.level5_mask = WAYLAND_xkb_keymap_mod_get_mask(seat->keyboard.xkb.keymap, XKB_VMOD_NAME_LEVEL5);
    seat->keyboard.xkb.num_mask = WAYLAND_xkb_keymap_mod_get_mask(seat->keyboard.xkb.keymap, XKB_VMOD_NAME_NUM);
    seat->keyboard.xkb.caps_mask = WAYLAND_xkb_keymap_mod_get_mask(seat->keyboard.xkb.keymap, XKB_MOD_NAME_CAPS);
#else
#define GET_MOD_INDEX(mod) \
    WAYLAND_xkb_keymap_mod_get_index(seat->keyboard.xkb.keymap, XKB_MOD_NAME_##mod)
    seat->keyboard.xkb.shift_mask = 1 << GET_MOD_INDEX(SHIFT);
    seat->keyboard.xkb.ctrl_mask = 1 << GET_MOD_INDEX(CTRL);
    seat->keyboard.xkb.alt_mask = 1 << GET_MOD_INDEX(ALT);
    seat->keyboard.xkb.gui_mask = 1 << GET_MOD_INDEX(LOGO);
    // Note: This is correct: Mod3 is typically level 5 shift, and Mod5 is typically level 3 shift.
    seat->keyboard.xkb.level3_mask = 1 << GET_MOD_INDEX(MOD5);
    seat->keyboard.xkb.level5_mask = 1 << GET_MOD_INDEX(MOD3);
    seat->keyboard.xkb.num_mask = 1 << GET_MOD_INDEX(NUM);
    seat->keyboard.xkb.caps_mask = 1 << GET_MOD_INDEX(CAPS);
#undef GET_MOD_INDEX
#endif

    if (seat->keyboard.xkb.state != NULL) {
        /* if there's already a state, throw it away rather than leaking it before
         * trying to create a new one with the new keymap.
         */
        WAYLAND_xkb_state_unref(seat->keyboard.xkb.state);
        seat->keyboard.xkb.state = NULL;
    }
    seat->keyboard.xkb.state = WAYLAND_xkb_state_new(seat->keyboard.xkb.keymap);
    if (!seat->keyboard.xkb.state) {
        SDL_SetError("failed to create XKB state");
        WAYLAND_xkb_keymap_unref(seat->keyboard.xkb.keymap);
        seat->keyboard.xkb.keymap = NULL;
        return;
    }

    /*
     * Assume that a nameless layout implies a virtual keyboard with an arbitrary layout.
     * TODO: Use a better method of detection?
     */
    seat->keyboard.is_virtual = WAYLAND_xkb_keymap_layout_get_name(seat->keyboard.xkb.keymap, 0) == NULL;

    // Allocate and populate the new layout maps.
    seat->keyboard.xkb.num_layouts = WAYLAND_xkb_keymap_num_layouts(seat->keyboard.xkb.keymap);
    if (seat->keyboard.xkb.num_layouts) {
        seat->keyboard.sdl_keymap = SDL_calloc(seat->keyboard.xkb.num_layouts, sizeof(SDL_Keymap *));
        if (!seat->keyboard.sdl_keymap) {
            return;
        }

        for (xkb_layout_index_t i = 0; i < seat->keyboard.xkb.num_layouts; ++i) {
            seat->keyboard.sdl_keymap[i] = SDL_CreateKeymap(false);
            if (!seat->keyboard.sdl_keymap[i]) {
                for (xkb_layout_index_t j = 0; j < i; ++j) {
                    SDL_DestroyKeymap(seat->keyboard.sdl_keymap[j]);
                }
                SDL_free(seat->keyboard.sdl_keymap);
                seat->keyboard.sdl_keymap = NULL;
                return;
            }
        }

        WAYLAND_xkb_keymap_key_for_each(seat->keyboard.xkb.keymap, Wayland_KeymapIterator, seat);

        // Restore any previously set modifier/layout information, if valid.
        WAYLAND_xkb_state_update_mask(seat->keyboard.xkb.state,
                                      seat->keyboard.xkb.wl_pressed_modifiers, seat->keyboard.xkb.wl_latched_modifiers, seat->keyboard.xkb.wl_locked_modifiers,
                                      0, 0, seat->keyboard.xkb.current_layout < seat->keyboard.xkb.num_layouts ? seat->keyboard.xkb.current_layout : 0);
        Wayland_SeatSetKeymap(seat);
    }

    /*
     * See https://blogs.s-osg.org/compose-key-support-weston/
     * for further explanation on dead keys in Wayland.
     */

    // Look up the preferred locale, falling back to "C" as default
    const char *locale = SDL_getenv("LC_ALL");
    if (!locale) {
        locale = SDL_getenv("LC_CTYPE");
        if (!locale) {
            locale = SDL_getenv("LANG");
            if (!locale) {
                locale = "C";
            }
        }
    }

    /* Set up the XKB compose table.
     *
     * This is a very slow operation, so it is only done during initialization,
     * or if the locale envvar changed during runtime.
     */
    if (!seat->keyboard.current_locale || SDL_strcmp(seat->keyboard.current_locale, locale) != 0) {
        // Cache the current locale for later comparison.
        SDL_free(seat->keyboard.current_locale);
        seat->keyboard.current_locale = SDL_strdup(locale);

        if (seat->keyboard.xkb.compose_table != NULL) {
            WAYLAND_xkb_compose_table_unref(seat->keyboard.xkb.compose_table);
            seat->keyboard.xkb.compose_table = NULL;
        }
        seat->keyboard.xkb.compose_table = WAYLAND_xkb_compose_table_new_from_locale(seat->display->xkb_context,
                                                                                     locale, XKB_COMPOSE_COMPILE_NO_FLAGS);
        if (seat->keyboard.xkb.compose_table) {
            // Set up XKB compose state
            if (seat->keyboard.xkb.compose_state != NULL) {
                WAYLAND_xkb_compose_state_unref(seat->keyboard.xkb.compose_state);
                seat->keyboard.xkb.compose_state = NULL;
            }
            seat->keyboard.xkb.compose_state = WAYLAND_xkb_compose_state_new(seat->keyboard.xkb.compose_table,
                                                                             XKB_COMPOSE_STATE_NO_FLAGS);
            if (!seat->keyboard.xkb.compose_state) {
                SDL_SetError("could not create XKB compose state");
                WAYLAND_xkb_compose_table_unref(seat->keyboard.xkb.compose_table);
                seat->keyboard.xkb.compose_table = NULL;
            }
        }
    } else if (seat->keyboard.xkb.compose_state) {
        WAYLAND_xkb_compose_state_reset(seat->keyboard.xkb.compose_state);
    }
}

/*
 * Virtual keyboards can have arbitrary layouts, arbitrary scancodes/keycodes, etc...
 * Key presses from these devices must be looked up by their keysym value.
 */
static SDL_Scancode Wayland_GetScancodeForKey(SDL_WaylandSeat *seat, uint32_t key, const xkb_keysym_t **syms)
{
    SDL_Scancode scancode = SDL_SCANCODE_UNKNOWN;

    if (!seat->keyboard.is_virtual) {
        scancode = SDL_GetScancodeFromTable(SDL_SCANCODE_TABLE_XFREE86_2, key);
    }
    if (scancode == SDL_SCANCODE_UNKNOWN) {
        const xkb_keysym_t *keysym;
        if (WAYLAND_xkb_state_key_get_syms(seat->keyboard.xkb.state, key + 8, &keysym) > 0) {
            scancode = SDL_GetScancodeFromKeySym(keysym[0], key + 8);
            if (syms) {
                *syms = keysym;
            }
        }
    }

    return scancode;
}

static void Wayland_ReconcileModifiers(SDL_WaylandSeat *seat, bool key_pressed)
{
    /* Handle explicit pressed modifier state. This will correct the modifier state
     * if common modifier keys were remapped and the modifiers presumed to be set
     * during a key press event were incorrect, or if the modifier was set to the
     * pressed state via means other than pressing the physical key.
     */
    if (!key_pressed) {
        if (seat->keyboard.xkb.wl_pressed_modifiers & seat->keyboard.xkb.shift_mask) {
            if (!(seat->keyboard.pressed_modifiers & SDL_KMOD_SHIFT)) {
                seat->keyboard.pressed_modifiers |= SDL_KMOD_SHIFT;
            }
        } else {
            seat->keyboard.pressed_modifiers &= ~SDL_KMOD_SHIFT;
        }

        if (seat->keyboard.xkb.wl_pressed_modifiers & seat->keyboard.xkb.ctrl_mask) {
            if (!(seat->keyboard.pressed_modifiers & SDL_KMOD_CTRL)) {
                seat->keyboard.pressed_modifiers |= SDL_KMOD_CTRL;
            }
        } else {
            seat->keyboard.pressed_modifiers &= ~SDL_KMOD_CTRL;
        }

        if (seat->keyboard.xkb.wl_pressed_modifiers & seat->keyboard.xkb.alt_mask) {
            if (!(seat->keyboard.pressed_modifiers & SDL_KMOD_ALT)) {
                seat->keyboard.pressed_modifiers |= SDL_KMOD_ALT;
            }
        } else {
            seat->keyboard.pressed_modifiers &= ~SDL_KMOD_ALT;
        }

        if (seat->keyboard.xkb.wl_pressed_modifiers & seat->keyboard.xkb.gui_mask) {
            if (!(seat->keyboard.pressed_modifiers & SDL_KMOD_GUI)) {
                seat->keyboard.pressed_modifiers |= SDL_KMOD_GUI;
            }
        } else {
            seat->keyboard.pressed_modifiers &= ~SDL_KMOD_GUI;
        }

        if (seat->keyboard.xkb.wl_pressed_modifiers & seat->keyboard.xkb.level3_mask) {
            if (!(seat->keyboard.pressed_modifiers & SDL_KMOD_MODE)) {
                seat->keyboard.pressed_modifiers |= SDL_KMOD_MODE;
            }
        } else {
            seat->keyboard.pressed_modifiers &= ~SDL_KMOD_MODE;
        }

        if (seat->keyboard.xkb.wl_pressed_modifiers & seat->keyboard.xkb.level5_mask) {
            if (!(seat->keyboard.pressed_modifiers & SDL_KMOD_LEVEL5)) {
                seat->keyboard.pressed_modifiers |= SDL_KMOD_LEVEL5;
            }
        } else {
            seat->keyboard.pressed_modifiers &= ~SDL_KMOD_LEVEL5;
        }
    }

    /* If a latch or lock was activated by a keypress, the latch/lock will
     * be tied to the specific left/right key that initiated it. Otherwise,
     * the ambiguous left/right combo is used.
     *
     * The modifier will remain active until the latch/lock is released by
     * the system.
     */
    const xkb_mod_mask_t xkb_locked_modifiers = seat->keyboard.xkb.wl_latched_modifiers | seat->keyboard.xkb.wl_locked_modifiers;

    if (xkb_locked_modifiers & seat->keyboard.xkb.shift_mask) {
        if (seat->keyboard.pressed_modifiers & SDL_KMOD_SHIFT) {
            seat->keyboard.locked_modifiers &= ~SDL_KMOD_SHIFT;
            seat->keyboard.locked_modifiers |= (seat->keyboard.pressed_modifiers & SDL_KMOD_SHIFT);
        } else if (!(seat->keyboard.locked_modifiers & SDL_KMOD_SHIFT)) {
            seat->keyboard.locked_modifiers |= SDL_KMOD_SHIFT;
        }
    } else {
        seat->keyboard.locked_modifiers &= ~SDL_KMOD_SHIFT;
    }

    if (xkb_locked_modifiers & seat->keyboard.xkb.ctrl_mask) {
        if (seat->keyboard.pressed_modifiers & SDL_KMOD_CTRL) {
            seat->keyboard.locked_modifiers &= ~SDL_KMOD_CTRL;
            seat->keyboard.locked_modifiers |= (seat->keyboard.pressed_modifiers & SDL_KMOD_CTRL);
        } else if (!(seat->keyboard.locked_modifiers & SDL_KMOD_CTRL)) {
            seat->keyboard.locked_modifiers |= SDL_KMOD_CTRL;
        }
    } else {
        seat->keyboard.locked_modifiers &= ~SDL_KMOD_CTRL;
    }

    if (xkb_locked_modifiers & seat->keyboard.xkb.alt_mask) {
        if (seat->keyboard.pressed_modifiers & SDL_KMOD_ALT) {
            seat->keyboard.locked_modifiers &= ~SDL_KMOD_ALT;
            seat->keyboard.locked_modifiers |= (seat->keyboard.pressed_modifiers & SDL_KMOD_ALT);
        } else if (!(seat->keyboard.locked_modifiers & SDL_KMOD_ALT)) {
            seat->keyboard.locked_modifiers |= SDL_KMOD_ALT;
        }
    } else {
        seat->keyboard.locked_modifiers &= ~SDL_KMOD_ALT;
    }

    if (xkb_locked_modifiers & seat->keyboard.xkb.gui_mask) {
        if (seat->keyboard.pressed_modifiers & SDL_KMOD_GUI) {
            seat->keyboard.locked_modifiers &= ~SDL_KMOD_GUI;
            seat->keyboard.locked_modifiers |= (seat->keyboard.pressed_modifiers & SDL_KMOD_GUI);
        } else if (!(seat->keyboard.locked_modifiers & SDL_KMOD_GUI)) {
            seat->keyboard.locked_modifiers |= SDL_KMOD_GUI;
        }
    } else {
        seat->keyboard.locked_modifiers &= ~SDL_KMOD_GUI;
    }

    if (xkb_locked_modifiers & seat->keyboard.xkb.level3_mask) {
        seat->keyboard.locked_modifiers |= SDL_KMOD_MODE;
    } else {
        seat->keyboard.locked_modifiers &= ~SDL_KMOD_MODE;
    }

    if (xkb_locked_modifiers & seat->keyboard.xkb.level5_mask) {
        seat->keyboard.locked_modifiers |= SDL_KMOD_LEVEL5;
    } else {
        seat->keyboard.locked_modifiers &= ~SDL_KMOD_LEVEL5;
    }

    // Capslock and Numlock can only be locked, not pressed.
    if (xkb_locked_modifiers & seat->keyboard.xkb.caps_mask) {
        seat->keyboard.locked_modifiers |= SDL_KMOD_CAPS;
    } else {
        seat->keyboard.locked_modifiers &= ~SDL_KMOD_CAPS;
    }

    if (xkb_locked_modifiers & seat->keyboard.xkb.num_mask) {
        seat->keyboard.locked_modifiers |= SDL_KMOD_NUM;
    } else {
        seat->keyboard.locked_modifiers &= ~SDL_KMOD_NUM;
    }

    SDL_SetModState(seat->keyboard.pressed_modifiers | seat->keyboard.locked_modifiers);
}

static void Wayland_HandleModifierKeys(SDL_WaylandSeat *seat, SDL_Scancode scancode, bool pressed)
{
    const SDL_Keycode keycode = SDL_GetKeyFromScancode(scancode, SDL_KMOD_NONE, false);
    SDL_Keymod mod;

    /* SDL clients expect modifier state to be activated at the same time as the
     * source keypress, so we set pressed modifier state with the usual modifier
     * keys here, as the explicit modifier event won't arrive until after the
     * keypress event. If this is wrong, it will be corrected when the explicit
     * modifier state is sent at a later time.
     */
    switch (keycode) {
    case SDLK_LSHIFT:
        mod = SDL_KMOD_LSHIFT;
        break;
    case SDLK_RSHIFT:
        mod = SDL_KMOD_RSHIFT;
        break;
    case SDLK_LCTRL:
        mod = SDL_KMOD_LCTRL;
        break;
    case SDLK_RCTRL:
        mod = SDL_KMOD_RCTRL;
        break;
    case SDLK_LALT:
        mod = SDL_KMOD_LALT;
        break;
    case SDLK_RALT:
        mod = SDL_KMOD_RALT;
        break;
    case SDLK_LGUI:
        mod = SDL_KMOD_LGUI;
        break;
    case SDLK_RGUI:
        mod = SDL_KMOD_RGUI;
        break;
    case SDLK_MODE:
        mod = SDL_KMOD_MODE;
        break;
    case SDLK_LEVEL5_SHIFT:
        mod = SDL_KMOD_LEVEL5;
        break;
    default:
        return;
    }

    if (pressed) {
        seat->keyboard.pressed_modifiers |= mod;
    } else {
        seat->keyboard.pressed_modifiers &= ~mod;
    }

    Wayland_ReconcileModifiers(seat, true);
}

static void keyboard_handle_enter(void *data, struct wl_keyboard *keyboard,
                                  uint32_t serial, struct wl_surface *surface,
                                  struct wl_array *keys)
{
    SDL_WaylandSeat *seat = data;
    uint32_t *key;

    if (!surface) {
        // Enter event for a destroyed surface.
        return;
    }

    SDL_WindowData *window = Wayland_GetWindowDataForOwnedSurface(surface);
    if (!window) {
        // Not a surface owned by SDL.
        return;
    }

    ++window->keyboard_focus_count;
    seat->keyboard.focus = window;

    // Restore the keyboard focus to the child popup that was holding it
    SDL_SetKeyboardFocus(window->sdlwindow->keyboard_focus ? window->sdlwindow->keyboard_focus : window->sdlwindow);

    // Update the keyboard grab and any relative pointer grabs related to this keyboard focus.
    Wayland_SeatUpdateKeyboardGrab(seat);
    Wayland_DisplayUpdatePointerGrabs(seat->display, window);

    // Update text input and IME focus.
    Wayland_SeatUpdateTextInput(seat);

#ifdef SDL_USE_IME
    if (!seat->text_input.zwp_text_input) {
        SDL_IME_SetFocus(true);
    }
#endif

    Uint64 timestamp = SDL_GetTicksNS();
    window->last_focus_event_time_ns = timestamp;

    Wayland_SeatSetKeymap(seat);

    wl_array_for_each (key, keys) {
        const SDL_Scancode scancode = Wayland_GetScancodeForKey(seat, *key, NULL);
        if (scancode != SDL_SCANCODE_UNKNOWN) {
            const SDL_Keycode keycode = SDL_GetKeyFromScancode(scancode, SDL_KMOD_NONE, false);

            switch (keycode) {
            case SDLK_LSHIFT:
            case SDLK_RSHIFT:
            case SDLK_LCTRL:
            case SDLK_RCTRL:
            case SDLK_LALT:
            case SDLK_RALT:
            case SDLK_LGUI:
            case SDLK_RGUI:
            case SDLK_MODE:
            case SDLK_LEVEL5_SHIFT:
                Wayland_HandleModifierKeys(seat, scancode, true);
                SDL_SendKeyboardKeyIgnoreModifiers(timestamp, seat->keyboard.sdl_id, *key, scancode, true);
                break;
            default:
                break;
            }
        }
    }
}

static void keyboard_handle_leave(void *data, struct wl_keyboard *keyboard,
                                  uint32_t serial, struct wl_surface *surface)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;

    if (!surface) {
        // Leave event for a destroyed surface.
        return;
    }

    SDL_WindowData *window = Wayland_GetWindowDataForOwnedSurface(surface);
    if (!window) {
        // Not a surface owned by SDL.
        return;
    }

    // Stop key repeat before clearing keyboard focus
    keyboard_repeat_clear(&seat->keyboard.repeat);

    SDL_Window *keyboard_focus = SDL_GetKeyboardFocus();

    // The keyboard focus may be a child popup
    while (keyboard_focus && SDL_WINDOW_IS_POPUP(keyboard_focus)) {
        keyboard_focus = keyboard_focus->parent;
    }

    const bool had_focus = keyboard_focus && window->sdlwindow == keyboard_focus;
    seat->keyboard.focus = NULL;
    --window->keyboard_focus_count;

    // Only relinquish focus if this window has the active focus, and no other keyboards have focus on the window.
    if (!window->keyboard_focus_count && had_focus) {
        SDL_SetKeyboardFocus(NULL);
    }

    // Release the keyboard grab and any relative pointer grabs related to this keyboard focus.
    Wayland_SeatUpdateKeyboardGrab(seat);
    Wayland_DisplayUpdatePointerGrabs(seat->display, window);

    // Clear the pressed modifiers.
    seat->keyboard.pressed_modifiers = SDL_KMOD_NONE;

    // Update text input and IME focus.
    Wayland_SeatUpdateTextInput(seat);

#ifdef SDL_USE_IME
    if (!seat->text_input.zwp_text_input && !window->keyboard_focus_count) {
        SDL_IME_SetFocus(false);
    }
#endif

    /* If the window has mouse focus, has no pointers within it, and no active touches, consider
     * mouse focus to be lost.
     */
    if (SDL_GetMouseFocus() == window->sdlwindow && !window->pointer_focus_count && !window->active_touch_count) {
        SDL_SetMouseFocus(NULL);
    }
}

static bool keyboard_input_get_text(char text[8], const SDL_WaylandSeat *seat, uint32_t key, bool down, bool *handled_by_ime)
{
    const xkb_keysym_t *syms;
    xkb_keysym_t sym;

    if (!seat->keyboard.focus || !seat->keyboard.xkb.state) {
        return false;
    }

    // TODO: Can this happen?
    if (WAYLAND_xkb_state_key_get_syms(seat->keyboard.xkb.state, key + 8, &syms) != 1) {
        return false;
    }
    sym = syms[0];

#ifdef SDL_USE_IME
    if (SDL_IME_ProcessKeyEvent(sym, key + 8, down)) {
        if (handled_by_ime) {
            *handled_by_ime = true;
        }
        return true;
    }
#endif

    if (!down) {
        return false;
    }

    if (seat->keyboard.xkb.compose_state && WAYLAND_xkb_compose_state_feed(seat->keyboard.xkb.compose_state, sym) == XKB_COMPOSE_FEED_ACCEPTED) {
        switch (WAYLAND_xkb_compose_state_get_status(seat->keyboard.xkb.compose_state)) {
        case XKB_COMPOSE_COMPOSING:
            if (handled_by_ime) {
                *handled_by_ime = true;
            }
            return true;
        case XKB_COMPOSE_CANCELLED:
        default:
            sym = XKB_KEY_NoSymbol;
            break;
        case XKB_COMPOSE_NOTHING:
            break;
        case XKB_COMPOSE_COMPOSED:
            sym = WAYLAND_xkb_compose_state_get_one_sym(seat->keyboard.xkb.compose_state);
            break;
        }
    }

    return WAYLAND_xkb_keysym_to_utf8(sym, text, 8) > 0;
}

static void keyboard_handle_key(void *data, struct wl_keyboard *keyboard,
                                uint32_t serial, uint32_t time, uint32_t key,
                                uint32_t state_w)
{
    SDL_WaylandSeat *seat = data;
    enum wl_keyboard_key_state state = state_w;
    char text[8];
    bool has_text = false;
    bool handled_by_ime = false;
    const Uint64 timestamp_ns = Wayland_GetKeyboardTimestamp(seat, time);

    Wayland_UpdateImplicitGrabSerial(seat, serial);

    if (state == WL_KEYBOARD_KEY_STATE_REPEATED) {
        // If this key shouldn't be repeated, just return.
        if (seat->keyboard.xkb.keymap && !WAYLAND_xkb_keymap_key_repeats(seat->keyboard.xkb.keymap, key + 8)) {
            return;
        }

        // SDL automatically handles key tracking and repeat status, so just map 'repeated' to 'pressed'.
        state = WL_KEYBOARD_KEY_STATE_PRESSED;
    }

    Wayland_SeatSetKeymap(seat);

    if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
        SDL_Window *keyboard_focus = SDL_GetKeyboardFocus();
        if (keyboard_focus && SDL_TextInputActive(keyboard_focus)) {
            has_text = keyboard_input_get_text(text, seat, key, true, &handled_by_ime);
        }
    } else {
        if (keyboard_repeat_key_is_set(&seat->keyboard.repeat, key)) {
            /* Send any due key repeat events before stopping the repeat and generating the key up event.
             * Compute time based on the Wayland time, as it reports when the release event happened.
             * Using SDL_GetTicks would be wrong, as it would report when the release event is processed,
             * which may be off if the application hasn't pumped events for a while.
             */
            const Uint64 elapsed = SDL_MS_TO_NS(time - seat->keyboard.repeat.wl_press_time_ms);
            keyboard_repeat_handle(&seat->keyboard.repeat, elapsed);
            keyboard_repeat_clear(&seat->keyboard.repeat);
        }
        keyboard_input_get_text(text, seat, key, false, &handled_by_ime);
    }

    const xkb_keysym_t *syms = NULL;
    SDL_Scancode scancode = Wayland_GetScancodeForKey(seat, key, &syms);
    Wayland_HandleModifierKeys(seat, scancode, state == WL_KEYBOARD_KEY_STATE_PRESSED);

    // If we have a key with unknown scancode, check if the keysym corresponds to a valid Unicode value, and assign it a reserved scancode.
    if (scancode == SDL_SCANCODE_UNKNOWN && syms && seat->keyboard.sdl_keymap) {
        const SDL_Keycode keycode = (SDL_Keycode)SDL_KeySymToUcs4(syms[0]);
        if (keycode != SDLK_UNKNOWN) {
            SDL_Keymod modstate = SDL_KMOD_NONE;

            // Check if this keycode already exists in the keymap.
            scancode = SDL_GetKeymapScancode(seat->keyboard.sdl_keymap[seat->keyboard.xkb.current_layout], keycode, &modstate);

            // Make sure we have this keycode in our keymap
            if (scancode == SDL_SCANCODE_UNKNOWN && keycode < SDLK_SCANCODE_MASK) {
                scancode = SDL_GetKeymapNextReservedScancode(seat->keyboard.sdl_keymap[seat->keyboard.xkb.current_layout]);
                SDL_SetKeymapEntry(seat->keyboard.sdl_keymap[seat->keyboard.xkb.current_layout], scancode, modstate, keycode);
            }
        }
    }

    SDL_SendKeyboardKeyIgnoreModifiers(timestamp_ns, seat->keyboard.sdl_id, key, scancode, state == WL_KEYBOARD_KEY_STATE_PRESSED);

    if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
        if (has_text && !(SDL_GetModState() & (SDL_KMOD_CTRL | SDL_KMOD_ALT))) {
            if (!handled_by_ime) {
                SDL_SendKeyboardText(text);
            }
        }
        if (seat->keyboard.xkb.keymap && WAYLAND_xkb_keymap_key_repeats(seat->keyboard.xkb.keymap, key + 8)) {
            keyboard_repeat_set(&seat->keyboard.repeat, seat->keyboard.sdl_id, key, time, timestamp_ns, scancode, has_text, text);
        }
    }
}

static void keyboard_handle_modifiers(void *data, struct wl_keyboard *keyboard,
                                      uint32_t serial, uint32_t mods_depressed,
                                      uint32_t mods_latched, uint32_t mods_locked,
                                      uint32_t group)
{
    SDL_WaylandSeat *seat = data;
    const uint32_t previous_layout = seat->keyboard.xkb.current_layout;

    seat->keyboard.xkb.wl_pressed_modifiers = mods_depressed;
    seat->keyboard.xkb.wl_latched_modifiers = mods_latched;
    seat->keyboard.xkb.wl_locked_modifiers = mods_locked;
    seat->keyboard.xkb.current_layout = group;

    Wayland_ReconcileModifiers(seat, false);

    // If we get a modifier notification before the keymap, there's no further state to update yet.
    if (!seat->keyboard.xkb.state) {
        return;
    }

    WAYLAND_xkb_state_update_mask(seat->keyboard.xkb.state,
                                  mods_depressed, mods_latched, mods_locked,
                                  0, 0, group);

    // If a key is repeating, update the text to apply the modifier.
    if (keyboard_repeat_is_set(&seat->keyboard.repeat)) {
        char text[8];
        const uint32_t key = keyboard_repeat_get_key(&seat->keyboard.repeat);

        if (keyboard_input_get_text(text, seat, key, true, NULL)) {
            keyboard_repeat_set_text(&seat->keyboard.repeat, text);
        }
    }

    if (group != previous_layout) {
        Wayland_SeatSetKeymap(seat);

        if (seat->keyboard.xkb.compose_state) {
            // Reset the compose state so composite and dead keys don't carry over.
            WAYLAND_xkb_compose_state_reset(seat->keyboard.xkb.compose_state);
        }
    }
}

static void keyboard_handle_repeat_info(void *data, struct wl_keyboard *wl_keyboard,
                                        int32_t rate, int32_t delay)
{
    SDL_WaylandSeat *seat = data;
    seat->keyboard.repeat.repeat_rate = SDL_clamp(rate, 0, 1000);
    seat->keyboard.repeat.repeat_delay_ms = delay;
    seat->keyboard.repeat.is_initialized = true;
}

static const struct wl_keyboard_listener keyboard_listener = {
    keyboard_handle_keymap,
    keyboard_handle_enter,
    keyboard_handle_leave,
    keyboard_handle_key,
    keyboard_handle_modifiers,
    keyboard_handle_repeat_info, // Version 4
};

static void Wayland_SeatDestroyPointer(SDL_WaylandSeat *seat)
{
    Wayland_CursorStateRelease(&seat->pointer.cursor_state);

    // End any active gestures.
    if (seat->pointer.gesture_focus) {
        SDL_SendPinch(SDL_EVENT_PINCH_END, 0, seat->pointer.gesture_focus->sdlwindow, 0.0f);
    }

    // Make sure focus is removed from a surface before the pointer is destroyed.
    if (seat->pointer.focus) {
        pointer_handle_leave(seat, seat->pointer.wl_pointer, 0, seat->pointer.focus->surface);
    }

    SDL_RemoveMouse(seat->pointer.sdl_id);

    if (seat->pointer.confined_pointer) {
        zwp_confined_pointer_v1_destroy(seat->pointer.confined_pointer);
    }

    if (seat->pointer.locked_pointer) {
        zwp_locked_pointer_v1_destroy(seat->pointer.locked_pointer);
    }

    if (seat->pointer.relative_pointer) {
        zwp_relative_pointer_v1_destroy(seat->pointer.relative_pointer);
    }

    if (seat->pointer.timestamps) {
        zwp_input_timestamps_v1_destroy(seat->pointer.timestamps);
    }

    if (seat->pointer.gesture_pinch) {
        zwp_pointer_gesture_pinch_v1_destroy(seat->pointer.gesture_pinch);
    }

    if (seat->pointer.wl_pointer) {
        if (wl_pointer_get_version(seat->pointer.wl_pointer) >= WL_POINTER_RELEASE_SINCE_VERSION) {
            wl_pointer_release(seat->pointer.wl_pointer);
        } else {
            wl_pointer_destroy(seat->pointer.wl_pointer);
        }
    }

    SDL_zero(seat->pointer);
}

static void Wayland_SeatDestroyKeyboard(SDL_WaylandSeat *seat)
{
    // Make sure focus is removed from a surface before the keyboard is destroyed.
    if (seat->keyboard.focus) {
        keyboard_handle_leave(seat, seat->keyboard.wl_keyboard, 0, seat->keyboard.focus->surface);
    }

    SDL_RemoveKeyboard(seat->keyboard.sdl_id);

    if (seat->keyboard.sdl_keymap) {
        if (seat->keyboard.xkb.current_layout < seat->keyboard.xkb.num_layouts &&
            seat->keyboard.sdl_keymap[seat->keyboard.xkb.current_layout] == SDL_GetCurrentKeymap(true)) {
            SDL_SetModState(SDL_KMOD_NONE);
        }
        for (xkb_layout_index_t i = 0; i < seat->keyboard.xkb.num_layouts; ++i) {
            SDL_DestroyKeymap(seat->keyboard.sdl_keymap[i]);
        }
        SDL_free(seat->keyboard.sdl_keymap);
        seat->keyboard.sdl_keymap = NULL;
    }

    if (seat->keyboard.key_inhibitor) {
        zwp_keyboard_shortcuts_inhibitor_v1_destroy(seat->keyboard.key_inhibitor);
    }

    if (seat->keyboard.timestamps) {
        zwp_input_timestamps_v1_destroy(seat->keyboard.timestamps);
    }

    if (seat->keyboard.wl_keyboard) {
        if (wl_keyboard_get_version(seat->keyboard.wl_keyboard) >= WL_KEYBOARD_RELEASE_SINCE_VERSION) {
            wl_keyboard_release(seat->keyboard.wl_keyboard);
        } else {
            wl_keyboard_destroy(seat->keyboard.wl_keyboard);
        }
    }

    SDL_free(seat->keyboard.current_locale);

    if (seat->keyboard.xkb.compose_state) {
        WAYLAND_xkb_compose_state_unref(seat->keyboard.xkb.compose_state);
    }

    if (seat->keyboard.xkb.compose_table) {
        WAYLAND_xkb_compose_table_unref(seat->keyboard.xkb.compose_table);
    }

    if (seat->keyboard.xkb.state) {
        WAYLAND_xkb_state_unref(seat->keyboard.xkb.state);
    }

    if (seat->keyboard.xkb.keymap) {
        WAYLAND_xkb_keymap_unref(seat->keyboard.xkb.keymap);
    }

    SDL_zero(seat->keyboard);
}

static void Wayland_SeatDestroyTouch(SDL_WaylandSeat *seat)
{
    // Cancel any active touches before the touch object is destroyed.
    if (seat->touch.wl_touch) {
        touch_handler_cancel(seat, seat->touch.wl_touch);
    }

    SDL_DelTouch((SDL_TouchID)(uintptr_t)seat->touch.wl_touch);

    if (seat->touch.timestamps) {
        zwp_input_timestamps_v1_destroy(seat->touch.timestamps);
    }

    if (seat->touch.wl_touch) {
        if (wl_touch_get_version(seat->touch.wl_touch) >= WL_TOUCH_RELEASE_SINCE_VERSION) {
            wl_touch_release(seat->touch.wl_touch);
        } else {
            wl_touch_destroy(seat->touch.wl_touch);
        }
    }

    SDL_zero(seat->touch);
    WAYLAND_wl_list_init(&seat->touch.points);
}

static void seat_handle_capabilities(void *data, struct wl_seat *wl_seat, enum wl_seat_capability capabilities)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    char name_fmt[256];

    if ((capabilities & WL_SEAT_CAPABILITY_POINTER) && !seat->pointer.wl_pointer) {
        seat->pointer.wl_pointer = wl_seat_get_pointer(wl_seat);
        SDL_memset(&seat->pointer.pending_frame.axis, 0, sizeof(seat->pointer.pending_frame.axis));

        Wayland_SeatCreateCursorShape(seat);

        wl_pointer_set_user_data(seat->pointer.wl_pointer, seat);
        wl_pointer_add_listener(seat->pointer.wl_pointer, &pointer_listener, seat);

        // Pointer gestures
        Wayland_SeatCreatePointerGestures(seat);

        seat->pointer.sdl_id = SDL_GetNextObjectID();

        if (seat->name) {
            SDL_snprintf(name_fmt, sizeof(name_fmt), "%s (%s)", WAYLAND_DEFAULT_POINTER_NAME, seat->name);
        } else {
            SDL_snprintf(name_fmt, sizeof(name_fmt), "%s %" SDL_PRIu32, WAYLAND_DEFAULT_POINTER_NAME, seat->pointer.sdl_id);
        }

        SDL_AddMouse(seat->pointer.sdl_id, name_fmt);
    } else if (!(capabilities & WL_SEAT_CAPABILITY_POINTER) && seat->pointer.wl_pointer) {
        Wayland_SeatDestroyPointer(seat);
    }

    if ((capabilities & WL_SEAT_CAPABILITY_TOUCH) && !seat->touch.wl_touch) {
        seat->touch.wl_touch = wl_seat_get_touch(wl_seat);
        wl_touch_set_user_data(seat->touch.wl_touch, seat);
        wl_touch_add_listener(seat->touch.wl_touch, &touch_listener, seat);

        if (seat->name) {
            SDL_snprintf(name_fmt, sizeof(name_fmt), "%s (%s)", WAYLAND_DEFAULT_TOUCH_NAME, seat->name);
        } else {
            SDL_snprintf(name_fmt, sizeof(name_fmt), "%s %" SDL_PRIu64, WAYLAND_DEFAULT_TOUCH_NAME, (SDL_TouchID)(uintptr_t)seat->touch.wl_touch);
        }

        SDL_AddTouch((SDL_TouchID)(uintptr_t)seat->touch.wl_touch, SDL_TOUCH_DEVICE_DIRECT, name_fmt);
    } else if (!(capabilities & WL_SEAT_CAPABILITY_TOUCH) && seat->touch.wl_touch) {
        Wayland_SeatDestroyTouch(seat);
    }

    if ((capabilities & WL_SEAT_CAPABILITY_KEYBOARD) && !seat->keyboard.wl_keyboard) {
        seat->keyboard.wl_keyboard = wl_seat_get_keyboard(wl_seat);
        wl_keyboard_set_user_data(seat->keyboard.wl_keyboard, seat);
        wl_keyboard_add_listener(seat->keyboard.wl_keyboard, &keyboard_listener, seat);

        seat->keyboard.sdl_id = SDL_GetNextObjectID();

        if (seat->name) {
            SDL_snprintf(name_fmt, sizeof(name_fmt), "%s (%s)", WAYLAND_DEFAULT_KEYBOARD_NAME, seat->name);
        } else {
            SDL_snprintf(name_fmt, sizeof(name_fmt), "%s %" SDL_PRIu32, WAYLAND_DEFAULT_KEYBOARD_NAME, seat->keyboard.sdl_id);
        }

        SDL_AddKeyboard(seat->keyboard.sdl_id, name_fmt);
    } else if (!(capabilities & WL_SEAT_CAPABILITY_KEYBOARD) && seat->keyboard.wl_keyboard) {
        Wayland_SeatDestroyKeyboard(seat);
    }

    Wayland_SeatRegisterInputTimestampListeners(seat);
}

static void seat_handle_name(void *data, struct wl_seat *wl_seat, const char *name)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;

    if (name && *name != '\0') {
        seat->name = SDL_strdup(name);
    }
}

static const struct wl_seat_listener seat_listener = {
    seat_handle_capabilities,
    seat_handle_name, // Version 2
};

static void data_source_handle_target(void *data, struct wl_data_source *wl_data_source,
                                      const char *mime_type)
{
}

static void data_source_handle_send(void *data, struct wl_data_source *wl_data_source,
                                    const char *mime_type, int32_t fd)
{
    Wayland_data_source_send((SDL_WaylandDataSource *)data, mime_type, fd);
}

static void data_source_handle_cancelled(void *data, struct wl_data_source *wl_data_source)
{
    SDL_WaylandDataSource *source = data;
    if (source) {
        Wayland_data_source_destroy(source);
    }
}

static void data_source_handle_dnd_drop_performed(void *data, struct wl_data_source *wl_data_source)
{
}

static void data_source_handle_dnd_finished(void *data, struct wl_data_source *wl_data_source)
{
}

static void data_source_handle_action(void *data, struct wl_data_source *wl_data_source,
                                      uint32_t dnd_action)
{
}

static const struct wl_data_source_listener data_source_listener = {
    data_source_handle_target,
    data_source_handle_send,
    data_source_handle_cancelled,
    data_source_handle_dnd_drop_performed, // Version 3
    data_source_handle_dnd_finished,       // Version 3
    data_source_handle_action,             // Version 3
};

static void primary_selection_source_send(void *data, struct zwp_primary_selection_source_v1 *zwp_primary_selection_source_v1,
                                          const char *mime_type, int32_t fd)
{
    Wayland_primary_selection_source_send((SDL_WaylandPrimarySelectionSource *)data,
                                          mime_type, fd);
}

static void primary_selection_source_cancelled(void *data, struct zwp_primary_selection_source_v1 *zwp_primary_selection_source_v1)
{
    Wayland_primary_selection_source_destroy(data);
}

static const struct zwp_primary_selection_source_v1_listener primary_selection_source_listener = {
    primary_selection_source_send,
    primary_selection_source_cancelled,
};

SDL_WaylandDataSource *Wayland_data_source_create(SDL_VideoDevice *_this)
{
    SDL_WaylandDataSource *data_source = NULL;
    SDL_VideoData *driver_data = NULL;
    struct wl_data_source *id = NULL;

    if (!_this || !_this->internal) {
        SDL_SetError("Video driver uninitialized");
    } else {
        driver_data = _this->internal;

        if (driver_data->data_device_manager) {
            id = wl_data_device_manager_create_data_source(
                driver_data->data_device_manager);
        }

        if (!id) {
            SDL_SetError("Wayland unable to create data source");
        } else {
            data_source = SDL_calloc(1, sizeof(*data_source));
            if (!data_source) {
                wl_data_source_destroy(id);
            } else {
                data_source->source = id;
                wl_data_source_set_user_data(id, data_source);
                wl_data_source_add_listener(id, &data_source_listener,
                                            data_source);
            }
        }
    }
    return data_source;
}

SDL_WaylandPrimarySelectionSource *Wayland_primary_selection_source_create(SDL_VideoDevice *_this)
{
    SDL_WaylandPrimarySelectionSource *primary_selection_source = NULL;
    SDL_VideoData *driver_data = NULL;
    struct zwp_primary_selection_source_v1 *id = NULL;

    if (!_this || !_this->internal) {
        SDL_SetError("Video driver uninitialized");
    } else {
        driver_data = _this->internal;

        if (driver_data->primary_selection_device_manager) {
            id = zwp_primary_selection_device_manager_v1_create_source(
                driver_data->primary_selection_device_manager);
        }

        if (!id) {
            SDL_SetError("Wayland unable to create primary selection source");
        } else {
            primary_selection_source = SDL_calloc(1, sizeof(*primary_selection_source));
            if (!primary_selection_source) {
                zwp_primary_selection_source_v1_destroy(id);
            } else {
                primary_selection_source->source = id;
                zwp_primary_selection_source_v1_add_listener(id, &primary_selection_source_listener,
                                                             primary_selection_source);
            }
        }
    }
    return primary_selection_source;
}

static void data_offer_handle_offer(void *data, struct wl_data_offer *wl_data_offer,
                                    const char *mime_type)
{
    SDL_WaylandDataOffer *offer = data;
    Wayland_data_offer_add_mime(offer, mime_type);
    SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                 ". In wl_data_offer_listener . data_offer_handle_offer on data_offer 0x%08x for MIME '%s'",
                 (wl_data_offer ? WAYLAND_wl_proxy_get_id((struct wl_proxy *)wl_data_offer) : -1),
                 mime_type);
}

static void data_offer_handle_source_actions(void *data, struct wl_data_offer *wl_data_offer,
                                             uint32_t source_actions)
{
    SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                 ". In wl_data_offer_listener . data_offer_handle_source_actions on data_offer 0x%08x for Source Actions '%d'",
                 (wl_data_offer ? WAYLAND_wl_proxy_get_id((struct wl_proxy *)wl_data_offer) : -1),
                 source_actions);
}

static void data_offer_handle_actions(void *data, struct wl_data_offer *wl_data_offer,
                                      uint32_t dnd_action)
{
    SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                 ". In wl_data_offer_listener . data_offer_handle_actions on data_offer 0x%08x for DND Actions '%d'",
                 (wl_data_offer ? WAYLAND_wl_proxy_get_id((struct wl_proxy *)wl_data_offer) : -1),
                 dnd_action);
}

static const struct wl_data_offer_listener data_offer_listener = {
    data_offer_handle_offer,
    data_offer_handle_source_actions, // Version 3
    data_offer_handle_actions,        // Version 3
};

static void primary_selection_offer_handle_offer(void *data, struct zwp_primary_selection_offer_v1 *zwp_primary_selection_offer_v1,
                                                 const char *mime_type)
{
    SDL_WaylandPrimarySelectionOffer *offer = data;
    Wayland_primary_selection_offer_add_mime(offer, mime_type);
    SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                 ". In zwp_primary_selection_offer_v1_listener . primary_selection_offer_handle_offer on primary_selection_offer 0x%08x for MIME '%s'",
                 (zwp_primary_selection_offer_v1 ? WAYLAND_wl_proxy_get_id((struct wl_proxy *)zwp_primary_selection_offer_v1) : -1),
                 mime_type);
}

static const struct zwp_primary_selection_offer_v1_listener primary_selection_offer_listener = {
    primary_selection_offer_handle_offer,
};

static void data_device_handle_data_offer(void *data, struct wl_data_device *wl_data_device,
                                          struct wl_data_offer *id)
{
    SDL_WaylandDataOffer *data_offer = SDL_calloc(1, sizeof(*data_offer));
    if (data_offer) {
        SDL_WaylandDataDevice *data_device = (SDL_WaylandDataDevice *)data;
        data_device->seat->display->last_incoming_data_offer_seat = data_device->seat;
        data_offer->offer = id;
        data_offer->data_device = data_device;
        data_offer->read_fd = -1;
        WAYLAND_wl_list_init(&(data_offer->mimes));
        wl_data_offer_set_user_data(id, data_offer);
        wl_data_offer_add_listener(id, &data_offer_listener, data_offer);
        SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                     ". In wl_data_device_listener . data_device_handle_data_offer on data_offer 0x%08x",
                     (id ? WAYLAND_wl_proxy_get_id((struct wl_proxy *)id) : -1));
    }
}

static void data_device_handle_enter(void *data, struct wl_data_device *wl_data_device,
                                     uint32_t serial, struct wl_surface *surface,
                                     wl_fixed_t x, wl_fixed_t y, struct wl_data_offer *id)
{
    SDL_WaylandDataDevice *data_device = data;
    data_device->has_mime_file = false;
    data_device->has_mime_text = false;
    uint32_t dnd_action = WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE;

    data_device->drag_serial = serial;

    if (id) {
        data_device->drag_offer = wl_data_offer_get_user_data(id);

        // TODO: SDL Support more mime types
#ifdef SDL_USE_LIBDBUS
        if (Wayland_data_offer_has_mime(data_device->drag_offer, FILE_PORTAL_MIME)) {
            data_device->has_mime_file = true;
            data_device->mime_type = FILE_PORTAL_MIME;
            wl_data_offer_accept(id, serial, FILE_PORTAL_MIME);
        }
#endif
        if (Wayland_data_offer_has_mime(data_device->drag_offer, FILE_MIME)) {
            data_device->has_mime_file = true;
            data_device->mime_type = FILE_MIME;
            wl_data_offer_accept(id, serial, FILE_MIME);
        }

        size_t mime_count = 0;
        const char **text_mime_types = Wayland_GetTextMimeTypes(SDL_GetVideoDevice(), &mime_count);
        for (size_t i = 0; i < mime_count; ++i) {
            if (Wayland_data_offer_has_mime(data_device->drag_offer, text_mime_types[i])) {
                data_device->has_mime_text = true;
                data_device->mime_type = text_mime_types[i];
                wl_data_offer_accept(id, serial, text_mime_types[i]);
                break;
            }
        }

        // SDL only supports "copy" style drag and drop
        if (data_device->has_mime_file || data_device->has_mime_text) {
            dnd_action = WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
        } else {
            // drag_mime is NULL this will decline the offer
            wl_data_offer_accept(id, serial, NULL);
        }
        if (wl_data_offer_get_version(data_device->drag_offer->offer) >=
            WL_DATA_OFFER_SET_ACTIONS_SINCE_VERSION) {
            wl_data_offer_set_actions(data_device->drag_offer->offer,
                                      dnd_action, dnd_action);
        }

        // find the current window
        if (surface) {
            SDL_WindowData *window = Wayland_GetWindowDataForOwnedSurface(surface);
            if (window) {
                data_device->dnd_window = window->sdlwindow;
                const float dx = (float)wl_fixed_to_double(x);
                const float dy = (float)wl_fixed_to_double(y);
                SDL_SendDropPosition(data_device->dnd_window, dx, dy);
                SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                             ". In wl_data_device_listener . data_device_handle_enter on data_offer 0x%08x at %d x %d into window %d for serial %d",
                             WAYLAND_wl_proxy_get_id((struct wl_proxy *)id),
                             wl_fixed_to_int(x), wl_fixed_to_int(y), SDL_GetWindowID(data_device->dnd_window), serial);
            } else {
                data_device->dnd_window = NULL;
                SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                             ". In wl_data_device_listener . data_device_handle_enter on data_offer 0x%08x at %d x %d for serial %d",
                             WAYLAND_wl_proxy_get_id((struct wl_proxy *)id),
                             wl_fixed_to_int(x), wl_fixed_to_int(y), serial);
            }
        } else {
            SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                         ". In wl_data_device_listener . data_device_handle_enter on data_offer 0x%08x at %d x %d for serial %d",
                         WAYLAND_wl_proxy_get_id((struct wl_proxy *)id),
                         wl_fixed_to_int(x), wl_fixed_to_int(y), serial);
        }
    } else {
        SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                     ". In wl_data_device_listener . data_device_handle_enter on data_offer 0x%08x at %d x %d for serial %d",
                     -1, wl_fixed_to_int(x), wl_fixed_to_int(y), serial);
    }
}

static void data_device_handle_leave(void *data, struct wl_data_device *wl_data_device)
{
    SDL_WaylandDataDevice *data_device = data;

    if (data_device->drag_offer) {
        if (data_device->dnd_window) {
            SDL_SendDropComplete(data_device->dnd_window);
            SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                         ". In wl_data_device_listener . data_device_handle_leave on data_offer 0x%08x from window %d for serial %d",
                         WAYLAND_wl_proxy_get_id((struct wl_proxy *)data_device->drag_offer->offer),
                         SDL_GetWindowID(data_device->dnd_window), data_device->drag_serial);
        } else {
            SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                         ". In wl_data_device_listener . data_device_handle_leave on data_offer 0x%08x for serial %d",
                         WAYLAND_wl_proxy_get_id((struct wl_proxy *)data_device->drag_offer->offer),
                         data_device->drag_serial);
        }
        Wayland_data_offer_destroy(data_device->drag_offer);
        data_device->drag_offer = NULL;
    } else {
        SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                     ". In wl_data_device_listener . data_device_handle_leave on data_offer 0x%08x for serial %d",
                     -1, -1);
    }
    data_device->has_mime_file = false;
    data_device->has_mime_text = false;
}

static void data_device_handle_motion(void *data, struct wl_data_device *wl_data_device,
                                      uint32_t time, wl_fixed_t x, wl_fixed_t y)
{
    SDL_WaylandDataDevice *data_device = data;

    if (data_device->drag_offer && data_device->dnd_window && (data_device->has_mime_file || data_device->has_mime_text)) {
        const float dx = (float)wl_fixed_to_double(x);
        const float dy = (float)wl_fixed_to_double(y);

        /* XXX: Send the filename here if the event system ever starts passing it though.
         *      Any future implementation should cache the filenames, as otherwise this could
         *      hammer the DBus interface hundreds or even thousands of times per second.
         */
        SDL_SendDropPosition(data_device->dnd_window, dx, dy);
        SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                     ". In wl_data_device_listener . data_device_handle_motion on data_offer 0x%08x at %d x %d in window %d serial %d",
                     WAYLAND_wl_proxy_get_id((struct wl_proxy *)data_device->drag_offer->offer),
                     wl_fixed_to_int(x), wl_fixed_to_int(y),
                     SDL_GetWindowID(data_device->dnd_window), data_device->drag_serial);
    } else {
        SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                     ". In wl_data_device_listener . data_device_handle_motion on data_offer 0x%08x at %d x %d serial %d",
                     -1, wl_fixed_to_int(x), wl_fixed_to_int(y), -1);
    }
}

static void data_device_handle_drop(void *data, struct wl_data_device *wl_data_device)
{
    SDL_WaylandDataDevice *data_device = data;

    if (data_device->drag_offer && data_device->dnd_window && (data_device->has_mime_file || data_device->has_mime_text)) {
        SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                     ". In wl_data_device_listener . data_device_handle_drop on data_offer 0x%08x in window %d serial %d",
                     WAYLAND_wl_proxy_get_id((struct wl_proxy *)data_device->drag_offer->offer),
                     SDL_GetWindowID(data_device->dnd_window), data_device->drag_serial);
        // TODO: SDL Support more mime types
        size_t length;
        bool drop_handled = false;
#ifdef SDL_USE_LIBDBUS
        if (Wayland_data_offer_has_mime(data_device->drag_offer, FILE_PORTAL_MIME)) {
            void *buffer = Wayland_data_offer_receive(data_device->drag_offer,
                                                      FILE_PORTAL_MIME, &length);
            if (buffer) {
                SDL_DBusContext *dbus = SDL_DBus_GetContext();
                if (dbus) {
                    int path_count = 0;
                    char **paths = SDL_DBus_DocumentsPortalRetrieveFiles(buffer, &path_count);
                    // If dropped files contain a directory the list is empty
                    if (paths && path_count > 0) {
                        int i;
                        for (i = 0; i < path_count; i++) {
                            SDL_SendDropFile(data_device->dnd_window, NULL, paths[i]);
                        }
                        dbus->free_string_array(paths);
                        SDL_SendDropComplete(data_device->dnd_window);
                        drop_handled = true;
                    }
                }
                SDL_free(buffer);
            }
        }
#endif
        /* If XDG document portal fails fallback.
         * When running a flatpak sandbox this will most likely be a list of
         * non paths that are not visible to the application
         */
        if (!drop_handled) {
            void *buffer = Wayland_data_offer_receive(data_device->drag_offer, data_device->mime_type, &length);
            if (data_device->has_mime_file) {
                if (buffer) {
                    char *saveptr = NULL;
                    char *token = SDL_strtok_r((char *)buffer, "\r\n", &saveptr);
                    while (token) {
                        if (SDL_URIToLocal(token, token) >= 0) {
                            SDL_SendDropFile(data_device->dnd_window, NULL, token);
                        }
                        token = SDL_strtok_r(NULL, "\r\n", &saveptr);
                    }
                    SDL_free(buffer);
                    SDL_SendDropComplete(data_device->dnd_window);
                } else {
                    SDL_SendDropComplete(data_device->dnd_window);
                }
                drop_handled = true;
            } else if (data_device->has_mime_text) {
                if (buffer) {
                    char *saveptr = NULL;
                    char *token = SDL_strtok_r((char *)buffer, "\r\n", &saveptr);
                    while (token) {
                        SDL_SendDropText(data_device->dnd_window, token);
                        token = SDL_strtok_r(NULL, "\r\n", &saveptr);
                    }
                    SDL_free(buffer);
                    SDL_SendDropComplete(data_device->dnd_window);
                } else {
                    /* Even though there has been a valid data offer,
                     *  and there have been valid Enter, Motion, and Drop callbacks,
                     *  Wayland_data_offer_receive may return an empty buffer,
                     *  because the data is actually in the primary selection device,
                     *  not in the data device.
                     */
                    SDL_SendDropComplete(data_device->dnd_window);
                }
                drop_handled = true;
            }
        }

        if (drop_handled && wl_data_offer_get_version(data_device->drag_offer->offer) >= WL_DATA_OFFER_FINISH_SINCE_VERSION) {
            wl_data_offer_finish(data_device->drag_offer->offer);
        }
    } else {
        SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                     ". In wl_data_device_listener . data_device_handle_drop on data_offer 0x%08x serial %d",
                     -1, -1);
    }

    Wayland_data_offer_destroy(data_device->drag_offer);
    data_device->drag_offer = NULL;
}

static void data_device_handle_selection(void *data, struct wl_data_device *wl_data_device,
                                         struct wl_data_offer *id)
{
    SDL_WaylandDataDevice *data_device = data;
    SDL_WaylandDataOffer *offer = NULL;

    if (id) {
        offer = wl_data_offer_get_user_data(id);
    }

    SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                 ". In data_device_listener . data_device_handle_selection on data_offer 0x%08x",
                 (id ? WAYLAND_wl_proxy_get_id((struct wl_proxy *)id) : -1));
    if (data_device->selection_offer != offer) {
        Wayland_data_offer_destroy(data_device->selection_offer);
        data_device->selection_offer = offer;
    }

    Wayland_data_offer_notify_from_mimes(offer, true);
}

static const struct wl_data_device_listener data_device_listener = {
    data_device_handle_data_offer,
    data_device_handle_enter,
    data_device_handle_leave,
    data_device_handle_motion,
    data_device_handle_drop,
    data_device_handle_selection
};

static void primary_selection_device_handle_offer(void *data, struct zwp_primary_selection_device_v1 *zwp_primary_selection_device_v1,
                                                  struct zwp_primary_selection_offer_v1 *id)
{
    SDL_WaylandPrimarySelectionOffer *primary_selection_offer = SDL_calloc(1, sizeof(*primary_selection_offer));
    if (primary_selection_offer) {
        SDL_WaylandPrimarySelectionDevice *primary_selection_device = (SDL_WaylandPrimarySelectionDevice *)data;
        primary_selection_device->seat->display->last_incoming_primary_selection_seat = primary_selection_device->seat;
        primary_selection_offer->offer = id;
        primary_selection_offer->primary_selection_device = primary_selection_device;
        WAYLAND_wl_list_init(&(primary_selection_offer->mimes));
        zwp_primary_selection_offer_v1_set_user_data(id, primary_selection_offer);
        zwp_primary_selection_offer_v1_add_listener(id, &primary_selection_offer_listener, primary_selection_offer);
    }
    SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                 ". In zwp_primary_selection_device_v1_listener . primary_selection_device_handle_offer on primary_selection_offer 0x%08x",
                 (id ? WAYLAND_wl_proxy_get_id((struct wl_proxy *)id) : -1));
}

static void primary_selection_device_handle_selection(void *data, struct zwp_primary_selection_device_v1 *zwp_primary_selection_device_v1,
                                                      struct zwp_primary_selection_offer_v1 *id)
{
    SDL_WaylandPrimarySelectionDevice *primary_selection_device = data;
    SDL_WaylandPrimarySelectionOffer *offer = NULL;

    if (id) {
        offer = zwp_primary_selection_offer_v1_get_user_data(id);
    }

    if (primary_selection_device->selection_offer != offer) {
        Wayland_primary_selection_offer_destroy(primary_selection_device->selection_offer);
        primary_selection_device->selection_offer = offer;
    }
    SDL_LogTrace(SDL_LOG_CATEGORY_INPUT,
                 ". In zwp_primary_selection_device_v1_listener . primary_selection_device_handle_selection on primary_selection_offer 0x%08x",
                 (id ? WAYLAND_wl_proxy_get_id((struct wl_proxy *)id) : -1));
}

static const struct zwp_primary_selection_device_v1_listener primary_selection_device_listener = {
    primary_selection_device_handle_offer,
    primary_selection_device_handle_selection
};

static void text_input_enter(void *data,
                             struct zwp_text_input_v3 *zwp_text_input_v3,
                             struct wl_surface *surface)
{
    // No-op
}

static void text_input_leave(void *data,
                             struct zwp_text_input_v3 *zwp_text_input_v3,
                             struct wl_surface *surface)
{
    // No-op
}

static void text_input_preedit_string(void *data,
                                      struct zwp_text_input_v3 *zwp_text_input_v3,
                                      const char *text,
                                      int32_t cursor_begin,
                                      int32_t cursor_end)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    seat->text_input.has_preedit = true;
    if (text) {
        int cursor_begin_utf8 = cursor_begin >= 0 ? (int)SDL_utf8strnlen(text, cursor_begin) : -1;
        int cursor_end_utf8 = cursor_end >= 0 ? (int)SDL_utf8strnlen(text, cursor_end) : -1;
        int cursor_size_utf8;
        if (cursor_end_utf8 >= 0) {
            if (cursor_begin_utf8 >= 0) {
                cursor_size_utf8 = cursor_end_utf8 - cursor_begin_utf8;
            } else {
                cursor_size_utf8 = cursor_end_utf8;
            }
        } else {
            cursor_size_utf8 = -1;
        }
        SDL_SendEditingText(text, cursor_begin_utf8, cursor_size_utf8);
    } else {
        SDL_SendEditingText("", 0, 0);
    }
}

static void text_input_commit_string(void *data,
                                     struct zwp_text_input_v3 *zwp_text_input_v3,
                                     const char *text)
{
    SDL_SendKeyboardText(text);
}

static void text_input_delete_surrounding_text(void *data,
                                               struct zwp_text_input_v3 *zwp_text_input_v3,
                                               uint32_t before_length,
                                               uint32_t after_length)
{
    // FIXME: Do we care about this event?
}

static void text_input_done(void *data,
                            struct zwp_text_input_v3 *zwp_text_input_v3,
                            uint32_t serial)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    if (!seat->text_input.has_preedit) {
        SDL_SendEditingText("", 0, 0);
    }
    seat->text_input.has_preedit = false;
}

static const struct zwp_text_input_v3_listener text_input_listener = {
    text_input_enter,
    text_input_leave,
    text_input_preedit_string,
    text_input_commit_string,
    text_input_delete_surrounding_text,
    text_input_done
};

static void Wayland_DataDeviceSetID(SDL_WaylandDataDevice *data_device)
{
    if (!data_device->id_str)
#ifdef SDL_USE_LIBDBUS
    {
        SDL_DBusContext *dbus = SDL_DBus_GetContext();
        if (dbus) {
            const char *id = dbus->bus_get_unique_name(dbus->session_conn);
            if (id) {
                data_device->id_str = SDL_strdup(id);
            }
        }
    }
    if (!data_device->id_str)
#endif
    {
        char id[24];
        Uint64 pid = (Uint64)getpid();
        SDL_snprintf(id, sizeof(id), "%" SDL_PRIu64, pid);
        data_device->id_str = SDL_strdup(id);
    }
}

static void Wayland_SeatCreateDataDevice(SDL_WaylandSeat *seat)
{
    if (!seat->display->data_device_manager) {
        return;
    }

    SDL_WaylandDataDevice *data_device = SDL_calloc(1, sizeof(*data_device));
    if (!data_device) {
        return;
    }

    data_device->data_device = wl_data_device_manager_get_data_device(
        seat->display->data_device_manager, seat->wl_seat);
    data_device->seat = seat;

    if (!data_device->data_device) {
        SDL_free(data_device);
    } else {
        Wayland_DataDeviceSetID(data_device);
        wl_data_device_set_user_data(data_device->data_device, data_device);
        wl_data_device_add_listener(data_device->data_device,
                                    &data_device_listener, data_device);
        seat->data_device = data_device;
    }
}

void Wayland_DisplayInitDataDeviceManager(SDL_VideoData *display)
{
    SDL_WaylandSeat *seat;
    wl_list_for_each (seat, &display->seat_list, link) {
        Wayland_SeatCreateDataDevice(seat);
    }
}

static void Wayland_SeatCreatePrimarySelectionDevice(SDL_WaylandSeat *seat)
{
    if (!seat->display->primary_selection_device_manager) {
        return;
    }

    SDL_WaylandPrimarySelectionDevice *primary_selection_device = SDL_calloc(1, sizeof(*primary_selection_device));
    if (!primary_selection_device) {
        return;
    }

    primary_selection_device->primary_selection_device = zwp_primary_selection_device_manager_v1_get_device(
        seat->display->primary_selection_device_manager, seat->wl_seat);
    primary_selection_device->seat = seat;

    if (!primary_selection_device->primary_selection_device) {
        SDL_free(primary_selection_device);
    } else {
        zwp_primary_selection_device_v1_set_user_data(primary_selection_device->primary_selection_device,
                                                      primary_selection_device);
        zwp_primary_selection_device_v1_add_listener(primary_selection_device->primary_selection_device,
                                                     &primary_selection_device_listener, primary_selection_device);
        seat->primary_selection_device = primary_selection_device;
    }
}

void Wayland_DisplayInitPrimarySelectionDeviceManager(SDL_VideoData *display)
{
    SDL_WaylandSeat *seat;
    wl_list_for_each (seat, &display->seat_list, link) {
        Wayland_SeatCreatePrimarySelectionDevice(seat);
    }
}

static void Wayland_SeatCreateTextInput(SDL_WaylandSeat *seat)
{
    if (seat->display->text_input_manager) {
        seat->text_input.zwp_text_input = zwp_text_input_manager_v3_get_text_input(seat->display->text_input_manager, seat->wl_seat);

        if (seat->text_input.zwp_text_input) {
            zwp_text_input_v3_set_user_data(seat->text_input.zwp_text_input, seat);
            zwp_text_input_v3_add_listener(seat->text_input.zwp_text_input,
                                           &text_input_listener, seat);
        }
    }
}

void Wayland_DisplayInitTextInputManager(SDL_VideoData *d, uint32_t id)
{
    SDL_WaylandSeat *seat;
    wl_list_for_each(seat, &d->seat_list, link) {
        Wayland_SeatCreateTextInput(seat);
    }
}

// Pen/Tablet support...
static void tablet_tool_handle_type(void *data, struct zwp_tablet_tool_v2 *tool, uint32_t type)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    switch (type) {
        #define CASE(typ) case ZWP_TABLET_TOOL_V2_TYPE_##typ: sdltool->info.subtype = SDL_PEN_TYPE_##typ; return
        CASE(ERASER);
        CASE(PEN);
        CASE(PENCIL);
        CASE(AIRBRUSH);
        CASE(BRUSH);
        #undef CASE
        default: sdltool->info.subtype = SDL_PEN_TYPE_UNKNOWN;  // we'll decline to add this when the `done` event comes through.
    }
}

static void tablet_tool_handle_hardware_serial(void *data, struct zwp_tablet_tool_v2 *tool, uint32_t serial_hi, uint32_t serial_lo)
{
    // don't care about this atm.
}

static void tablet_tool_handle_hardware_id_wacom(void *data, struct zwp_tablet_tool_v2 *tool, uint32_t id_hi, uint32_t id_lo)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    sdltool->info.wacom_id = id_lo;
}

static void tablet_tool_handle_capability(void *data, struct zwp_tablet_tool_v2 *tool, uint32_t capability)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    switch (capability) {
        #define CASE(wltyp,sdltyp) case ZWP_TABLET_TOOL_V2_CAPABILITY_##wltyp: sdltool->info.capabilities |= sdltyp; return
        CASE(TILT, SDL_PEN_CAPABILITY_XTILT | SDL_PEN_CAPABILITY_YTILT);
        CASE(PRESSURE, SDL_PEN_CAPABILITY_PRESSURE);
        CASE(DISTANCE, SDL_PEN_CAPABILITY_DISTANCE);
        CASE(ROTATION, SDL_PEN_CAPABILITY_ROTATION);
        CASE(SLIDER, SDL_PEN_CAPABILITY_SLIDER);
        #undef CASE
        default: break;  // unsupported here.
    }
}

static void tablet_tool_handle_done(void *data, struct zwp_tablet_tool_v2 *tool)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    if (sdltool->info.subtype != SDL_PEN_TYPE_UNKNOWN) {   // don't tell SDL about it if we don't know its role.
        SDL_Window *window = sdltool->focus ? sdltool->focus->sdlwindow : NULL;
        sdltool->instance_id = SDL_AddPenDevice(0, NULL, window, &sdltool->info, sdltool, false);
    }
}

static void tablet_tool_handle_removed(void *data, struct zwp_tablet_tool_v2 *tool)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    if (sdltool->instance_id) {
        SDL_Window *window = sdltool->focus ? sdltool->focus->sdlwindow : NULL;
        SDL_RemovePenDevice(0, window, sdltool->instance_id);
    }

    Wayland_CursorStateRelease(&sdltool->cursor_state);
    zwp_tablet_tool_v2_destroy(sdltool->wltool);
    WAYLAND_wl_list_remove(&sdltool->link);
    SDL_free(sdltool);
}

static void tablet_tool_handle_proximity_in(void *data, struct zwp_tablet_tool_v2 *tool, uint32_t serial, struct zwp_tablet_v2 *tablet, struct wl_surface *surface)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    SDL_WindowData *windowdata = surface ? Wayland_GetWindowDataForOwnedSurface(surface) : NULL;
    sdltool->focus = windowdata;
    sdltool->proximity_serial = serial;
    sdltool->frame.have_proximity = true;
    sdltool->frame.in_proximity = true;

    // According to the docs, this should be followed by a frame event, where we'll send our SDL events.
}

static void tablet_tool_handle_proximity_out(void *data, struct zwp_tablet_tool_v2 *tool)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    sdltool->frame.have_proximity = true;
    sdltool->frame.in_proximity = false;
}

static void tablet_tool_handle_down(void *data, struct zwp_tablet_tool_v2 *tool, uint32_t serial)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    sdltool->frame.tool_state = WAYLAND_TABLET_TOOL_STATE_DOWN;
}

static void tablet_tool_handle_up(void *data, struct zwp_tablet_tool_v2 *tool)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    sdltool->frame.tool_state = WAYLAND_TABLET_TOOL_STATE_UP;
}

static void tablet_tool_handle_motion(void *data, struct zwp_tablet_tool_v2 *tool, wl_fixed_t sx_w, wl_fixed_t sy_w)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    SDL_WindowData *windowdata = sdltool->focus;
    if (windowdata) {
        sdltool->frame.x = (float)(wl_fixed_to_double(sx_w) * windowdata->pointer_scale.x);
        sdltool->frame.y = (float)(wl_fixed_to_double(sy_w) * windowdata->pointer_scale.y);
        sdltool->frame.have_motion = true;
    }
}

static void tablet_tool_handle_pressure(void *data, struct zwp_tablet_tool_v2 *tool, uint32_t pressure)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    sdltool->frame.axes[SDL_PEN_AXIS_PRESSURE] = ((float) pressure) / 65535.0f;
    sdltool->frame.axes_set |= (1u << SDL_PEN_AXIS_PRESSURE);
    if (pressure) {
        sdltool->frame.axes[SDL_PEN_AXIS_DISTANCE] = 0.0f;
        sdltool->frame.axes_set |= (1u << SDL_PEN_AXIS_DISTANCE);
    }
}

static void tablet_tool_handle_distance(void *data, struct zwp_tablet_tool_v2 *tool, uint32_t distance)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    sdltool->frame.axes[SDL_PEN_AXIS_DISTANCE] = ((float) distance) / 65535.0f;
    sdltool->frame.axes_set |= (1u << SDL_PEN_AXIS_DISTANCE);
    if (distance) {
        sdltool->frame.axes[SDL_PEN_AXIS_PRESSURE] = 0.0f;
        sdltool->frame.axes_set |= (1u << SDL_PEN_AXIS_PRESSURE);
    }
}

static void tablet_tool_handle_tilt(void *data, struct zwp_tablet_tool_v2 *tool, wl_fixed_t xtilt, wl_fixed_t ytilt)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    sdltool->frame.axes[SDL_PEN_AXIS_XTILT] = (float)(wl_fixed_to_double(xtilt));
    sdltool->frame.axes[SDL_PEN_AXIS_YTILT] = (float)(wl_fixed_to_double(ytilt));
    sdltool->frame.axes_set |= (1u << SDL_PEN_AXIS_XTILT) | (1u << SDL_PEN_AXIS_YTILT);
}

static void tablet_tool_handle_button(void *data, struct zwp_tablet_tool_v2 *tool, uint32_t serial, uint32_t button, uint32_t state)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    int sdlbutton;

    switch (button) {
    // see %{_includedir}/linux/input-event-codes.h
    case 0x14b: // BTN_STYLUS
        sdlbutton = 1;
        break;
    case 0x14c: // BTN_STYLUS2
        sdlbutton = 2;
        break;
    case 0x149: // BTN_STYLUS3
        sdlbutton = 3;
        break;
    default:
        return;  // don't care about this button, I guess.
    }

    SDL_assert((sdlbutton >= 1) && (sdlbutton <= SDL_arraysize(sdltool->frame.buttons)));
    sdltool->frame.buttons[sdlbutton-1] = (state == ZWP_TABLET_PAD_V2_BUTTON_STATE_PRESSED) ? WAYLAND_TABLET_TOOL_BUTTON_DOWN : WAYLAND_TABLET_TOOL_BUTTON_UP;
}

static void tablet_tool_handle_rotation(void *data, struct zwp_tablet_tool_v2 *tool, wl_fixed_t degrees)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    const float rotation = (float)(wl_fixed_to_double(degrees));
    sdltool->frame.axes[SDL_PEN_AXIS_ROTATION] = (rotation > 180.0f) ? (rotation - 360.0f) : rotation;  // map to -180.0f ... 179.0f range
    sdltool->frame.axes_set |= (1u << SDL_PEN_AXIS_ROTATION);
}

static void tablet_tool_handle_slider(void *data, struct zwp_tablet_tool_v2 *tool, int32_t position)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    sdltool->frame.axes[SDL_PEN_AXIS_SLIDER] = position / 65535.f;
    sdltool->frame.axes_set |= (1u << SDL_PEN_AXIS_SLIDER);
}

static void tablet_tool_handle_wheel(void *data, struct zwp_tablet_tool_v2 *tool, int32_t degrees, int32_t clicks)
{
    // not supported at the moment
}

static void tablet_tool_handle_frame(void *data, struct zwp_tablet_tool_v2 *tool, uint32_t time)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) data;
    const SDL_PenID instance_id = sdltool->instance_id;
    if (!instance_id) {
        return;  // Not a pen we report on.
    }

    const Uint64 timestamp = Wayland_AdjustEventTimestampBase(Wayland_EventTimestampMSToNS(time));
    SDL_Window *window = sdltool->focus ? sdltool->focus->sdlwindow : NULL;

    if (sdltool->frame.have_proximity && sdltool->frame.in_proximity) {
        SDL_SendPenProximity(timestamp, instance_id, window, true);
        Wayland_TabletToolUpdateCursor(sdltool);
    }

    // !!! FIXME: Should hit testing be done if pens generate pointer motion?

    // I don't know if this is necessary (or makes sense), but send motion before pen downs, but after pen ups, so you don't get unexpected lines drawn.
    if (sdltool->frame.have_motion && sdltool->frame.tool_state) {
        if (sdltool->frame.tool_state == WAYLAND_TABLET_TOOL_STATE_DOWN) {
            SDL_SendPenMotion(timestamp, instance_id, window, sdltool->frame.x, sdltool->frame.y);
            SDL_SendPenTouch(timestamp, instance_id, window, false, true);  // !!! FIXME: how do we know what tip is in use?
        } else {
            SDL_SendPenTouch(timestamp, instance_id, window, false, false); // !!! FIXME: how do we know what tip is in use?
            SDL_SendPenMotion(timestamp, instance_id, window, sdltool->frame.x, sdltool->frame.y);
        }
    } else {
        if (sdltool->frame.tool_state) {
            SDL_SendPenTouch(timestamp, instance_id, window, false, sdltool->frame.tool_state == WAYLAND_TABLET_TOOL_STATE_DOWN);  // !!! FIXME: how do we know what tip is in use?
        }

        if (sdltool->frame.have_motion) {
            SDL_SendPenMotion(timestamp, instance_id, window, sdltool->frame.x, sdltool->frame.y);
        }
    }

    for (SDL_PenAxis i = 0; i < SDL_PEN_AXIS_COUNT; i++) {
        if (sdltool->frame.axes_set & (1u << i)) {
            SDL_SendPenAxis(timestamp, instance_id, window, i, sdltool->frame.axes[i]);
        }
    }

    for (int i = 0; i < SDL_arraysize(sdltool->frame.buttons); i++) {
        const int state = sdltool->frame.buttons[i];
        if (state) {
            SDL_SendPenButton(timestamp, instance_id, window, (Uint8)(i + 1), state == WAYLAND_TABLET_TOOL_BUTTON_DOWN);
        }
    }

    if (sdltool->frame.have_proximity && !sdltool->frame.in_proximity) {
        SDL_SendPenProximity(timestamp, instance_id, window, false);
        sdltool->focus = NULL;
        Wayland_TabletToolUpdateCursor(sdltool);
    }

    // Reset for the next frame.
    SDL_zero(sdltool->frame);
}

static const struct zwp_tablet_tool_v2_listener tablet_tool_listener = {
    tablet_tool_handle_type,
    tablet_tool_handle_hardware_serial,
    tablet_tool_handle_hardware_id_wacom,
    tablet_tool_handle_capability,
    tablet_tool_handle_done,
    tablet_tool_handle_removed,
    tablet_tool_handle_proximity_in,
    tablet_tool_handle_proximity_out,
    tablet_tool_handle_down,
    tablet_tool_handle_up,
    tablet_tool_handle_motion,
    tablet_tool_handle_pressure,
    tablet_tool_handle_distance,
    tablet_tool_handle_tilt,
    tablet_tool_handle_rotation,
    tablet_tool_handle_slider,
    tablet_tool_handle_wheel,
    tablet_tool_handle_button,
    tablet_tool_handle_frame
};


static void tablet_seat_handle_tablet_added(void *data, struct zwp_tablet_seat_v2 *zwp_tablet_seat_v2, struct zwp_tablet_v2 *tablet)
{
    // don't care atm.
}

static void tablet_seat_handle_tool_added(void *data, struct zwp_tablet_seat_v2 *zwp_tablet_seat_v2, struct zwp_tablet_tool_v2 *tool)
{
    SDL_WaylandSeat *seat = (SDL_WaylandSeat *)data;
    SDL_WaylandPenTool *sdltool = SDL_calloc(1, sizeof(*sdltool));

    if (sdltool) {  // if allocation failed, oh well, we won't report this device.
        sdltool->wltool = tool;
        sdltool->info.max_tilt = -1.0f;
        sdltool->info.num_buttons = -1;

        if (seat->display->cursor_shape_manager) {
            sdltool->cursor_state.cursor_shape = wp_cursor_shape_manager_v1_get_tablet_tool_v2(seat->display->cursor_shape_manager, tool);
        }

        WAYLAND_wl_list_insert(&seat->tablet.tool_list, &sdltool->link);

        // this will send a bunch of zwp_tablet_tool_v2 events right up front to tell
        // us device details, with a "done" event to let us know we have everything.
        zwp_tablet_tool_v2_add_listener(tool, &tablet_tool_listener, sdltool);
    }
}

static void tablet_seat_handle_pad_added(void *data, struct zwp_tablet_seat_v2 *zwp_tablet_seat_v2, struct zwp_tablet_pad_v2 *pad)
{
    // we don't care atm.
}

static const struct zwp_tablet_seat_v2_listener tablet_seat_listener = {
    tablet_seat_handle_tablet_added,
    tablet_seat_handle_tool_added,
    tablet_seat_handle_pad_added
};

static void Wayland_SeatInitTabletSupport(SDL_WaylandSeat *seat)
{
    seat->tablet.wl_tablet_seat = zwp_tablet_manager_v2_get_tablet_seat(seat->display->tablet_manager, seat->wl_seat);
    zwp_tablet_seat_v2_add_listener(seat->tablet.wl_tablet_seat, &tablet_seat_listener, seat);
}

void Wayland_DisplayInitTabletManager(SDL_VideoData *display)
{
    SDL_WaylandSeat *seat;
    wl_list_for_each (seat, &display->seat_list, link) {
        Wayland_SeatInitTabletSupport(seat);
    }
}

static void Wayland_remove_all_pens_callback(SDL_PenID instance_id, void *handle, void *userdata)
{
    SDL_WaylandPenTool *sdltool = (SDL_WaylandPenTool *) handle;

    Wayland_CursorStateRelease(&sdltool->cursor_state);
    zwp_tablet_tool_v2_destroy(sdltool->wltool);
    SDL_free(sdltool);
}

static void Wayland_SeatDestroyTablet(SDL_WaylandSeat *seat, bool shutting_down)
{
    if (!shutting_down) {
        SDL_WaylandPenTool *tool, *temp;
        wl_list_for_each_safe (tool, temp, &seat->tablet.tool_list, link) {
            // Remove all tools for this seat, sending PROXIMITY_OUT events.
            tablet_tool_handle_removed(tool, tool->wltool);
        }
    } else {
        // Shutting down, just delete everything.
        SDL_RemoveAllPenDevices(Wayland_remove_all_pens_callback, NULL);
    }

    if (seat->tablet.wl_tablet_seat) {
        zwp_tablet_seat_v2_destroy(seat->tablet.wl_tablet_seat);
        seat->tablet.wl_tablet_seat = NULL;
    }

    SDL_zero(seat->tablet);
    WAYLAND_wl_list_init(&seat->tablet.tool_list);
}

void Wayland_DisplayCreateSeat(SDL_VideoData *display, struct wl_seat *wl_seat, Uint32 id)
{
    SDL_WaylandSeat *seat = SDL_calloc(1, sizeof(SDL_WaylandSeat));
    if (!seat) {
        return;
    }

    // Keep the seats in the order in which they were added.
    WAYLAND_wl_list_insert(display->seat_list.prev, &seat->link);

    WAYLAND_wl_list_init(&seat->touch.points);
    WAYLAND_wl_list_init(&seat->tablet.tool_list);
    seat->wl_seat = wl_seat;
    seat->display = display;
    seat->registry_id = id;

    Wayland_SeatCreateDataDevice(seat);
    Wayland_SeatCreatePrimarySelectionDevice(seat);
    Wayland_SeatCreateTextInput(seat);

    wl_seat_set_user_data(seat->wl_seat, seat);
    wl_seat_add_listener(seat->wl_seat, &seat_listener, seat);

    if (display->tablet_manager) {
        Wayland_SeatInitTabletSupport(seat);
    }
}

void Wayland_DisplayRemoveWindowReferencesFromSeats(SDL_VideoData *display, SDL_WindowData *window)
{
    SDL_WaylandSeat *seat;
    wl_list_for_each (seat, &display->seat_list, link)
    {
        if (seat->keyboard.focus == window) {
            keyboard_handle_leave(seat, seat->keyboard.wl_keyboard, 0, window->surface);
        }

        if (seat->pointer.focus == window) {
            pointer_handle_leave(seat, seat->pointer.wl_pointer, 0, window->surface);
        }

        // Need the safe loop variant here as cancelling a touch point removes it from the list.
        SDL_WaylandTouchPoint *tp, *temp;
        wl_list_for_each_safe (tp, temp, &seat->touch.points, link) {
            if (tp->surface == window->surface) {
                Wayland_SeatCancelTouch(seat, tp);
            }
        }

        SDL_WaylandPenTool *tool;
        wl_list_for_each (tool, &seat->tablet.tool_list, link) {
            if (tool->focus == window) {
                tool->focus = NULL;
                Wayland_TabletToolUpdateCursor(tool);
                if (tool->instance_id) {
                    SDL_RemovePenDevice(0, window->sdlwindow, tool->instance_id);
                    tool->instance_id = 0;
                }
            }
        }
    }
}

void Wayland_SeatDestroy(SDL_WaylandSeat *seat, bool shutting_down)
{
    if (!seat) {
        return;
    }

    SDL_free(seat->name);

    if (seat->data_device) {
        Wayland_data_device_clear_selection(seat->data_device);
        if (seat->data_device->selection_offer) {
            Wayland_data_offer_destroy(seat->data_device->selection_offer);
        }
        if (seat->data_device->drag_offer) {
            Wayland_data_offer_destroy(seat->data_device->drag_offer);
        }
        if (seat->data_device->data_device) {
            if (wl_data_device_get_version(seat->data_device->data_device) >= WL_DATA_DEVICE_RELEASE_SINCE_VERSION) {
                wl_data_device_release(seat->data_device->data_device);
            } else {
                wl_data_device_destroy(seat->data_device->data_device);
            }
        }
        SDL_free(seat->data_device->id_str);
        SDL_free(seat->data_device);
    }

    if (seat->primary_selection_device) {
        if (seat->primary_selection_device->selection_offer) {
            Wayland_primary_selection_offer_destroy(seat->primary_selection_device->selection_offer);
        }
        if (seat->primary_selection_device->selection_source) {
            Wayland_primary_selection_source_destroy(seat->primary_selection_device->selection_source);
        }
        if (seat->primary_selection_device->primary_selection_device) {
            zwp_primary_selection_device_v1_destroy(seat->primary_selection_device->primary_selection_device);
        }
        SDL_free(seat->primary_selection_device);
    }

    if (seat->text_input.zwp_text_input) {
        zwp_text_input_v3_destroy(seat->text_input.zwp_text_input);
    }

    Wayland_SeatDestroyKeyboard(seat);
    Wayland_SeatDestroyPointer(seat);
    Wayland_SeatDestroyTouch(seat);
    Wayland_SeatDestroyTablet(seat, shutting_down);

    if (wl_seat_get_version(seat->wl_seat) >= WL_SEAT_RELEASE_SINCE_VERSION) {
        wl_seat_release(seat->wl_seat);
    } else {
        wl_seat_destroy(seat->wl_seat);
    }

    WAYLAND_wl_list_remove(&seat->link);
    SDL_free(seat);
}

static void Wayland_SeatUpdateRelativePointer(SDL_WaylandSeat *seat)
{
    if (seat->display->relative_pointer_manager) {
        bool relative_focus = false;

        if (seat->pointer.focus) {
            /* If a seat has both keyboard and pointer capabilities, relative focus will follow the keyboard
             * attached to that seat. Otherwise, relative focus will be gained if any other seat has keyboard
             * focus on the window with pointer focus.
             */
            if (seat->pointer.focus->sdlwindow->flags & SDL_WINDOW_MOUSE_RELATIVE_MODE) {
                if (seat->keyboard.wl_keyboard) {
                    relative_focus = seat->keyboard.focus == seat->pointer.focus;
                } else {
                    relative_focus = seat->pointer.focus->keyboard_focus_count != 0;
                }
            } else {
                relative_focus = SDL_GetMouse()->warp_emulation_active;
            }
        }

        if (relative_focus) {
            if (!seat->pointer.relative_pointer) {
                seat->pointer.relative_pointer = zwp_relative_pointer_manager_v1_get_relative_pointer(seat->display->relative_pointer_manager, seat->pointer.wl_pointer);
                zwp_relative_pointer_v1_add_listener(seat->pointer.relative_pointer, &relative_pointer_listener, seat);
            }
        } else if (seat->pointer.relative_pointer) {
            zwp_relative_pointer_v1_destroy(seat->pointer.relative_pointer);
            seat->pointer.relative_pointer = NULL;
        }
    }
}

static void Wayland_SeatUpdateKeyboardGrab(SDL_WaylandSeat *seat)
{
    SDL_VideoData *display = seat->display;

    if (display->key_inhibitor_manager) {
        // Destroy the existing key inhibitor.
        if (seat->keyboard.key_inhibitor) {
            zwp_keyboard_shortcuts_inhibitor_v1_destroy(seat->keyboard.key_inhibitor);
            seat->keyboard.key_inhibitor = NULL;
        }

        if (seat->keyboard.wl_keyboard) {
            SDL_WindowData *w = seat->keyboard.focus;
            if (w) {
                SDL_Window *window = w->sdlwindow;

                // Don't grab the keyboard if it shouldn't be grabbed.
                if (window->flags & SDL_WINDOW_KEYBOARD_GRABBED) {
                    seat->keyboard.key_inhibitor =
                        zwp_keyboard_shortcuts_inhibit_manager_v1_inhibit_shortcuts(display->key_inhibitor_manager, w->surface, seat->wl_seat);
                }
            }
        }
    }
}

void Wayland_SeatUpdatePointerGrab(SDL_WaylandSeat *seat)
{
    SDL_VideoData *display = seat->display;
    Wayland_SeatUpdateRelativePointer(seat);

    if (display->pointer_constraints) {
        if (seat->pointer.locked_pointer && !seat->pointer.relative_pointer) {
            zwp_locked_pointer_v1_destroy(seat->pointer.locked_pointer);
            seat->pointer.locked_pointer = NULL;

            // Update the cursor after destroying a relative move lock.
            Wayland_SeatUpdatePointerCursor(seat);
        }

        if (seat->pointer.wl_pointer) {
            // If relative mode is active, and the pointer focus matches the keyboard focus, lock it.
            if (seat->pointer.relative_pointer) {
                if (!seat->pointer.locked_pointer) {
                    // Creating a lock on a surface with an active confinement region on the same seat is a protocol error.
                    if (seat->pointer.confined_pointer) {
                        zwp_confined_pointer_v1_destroy(seat->pointer.confined_pointer);
                        seat->pointer.confined_pointer = NULL;
                    }

                    seat->pointer.locked_pointer = zwp_pointer_constraints_v1_lock_pointer(display->pointer_constraints,
                                                                                           seat->pointer.focus->surface,
                                                                                           seat->pointer.wl_pointer, NULL,
                                                                                           ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
                    zwp_locked_pointer_v1_add_listener(seat->pointer.locked_pointer, &locked_pointer_listener, seat);

                    // Ensure that the relative pointer is hidden, if required.
                    Wayland_SeatUpdatePointerCursor(seat);
                }

                // Locked the cursor for relative mode, nothing more to do.
                return;
            }

            /* A confine may already be active, in which case we should destroy it and create a new one
             * in case it changed size.
             */
            if (seat->pointer.confined_pointer) {
                zwp_confined_pointer_v1_destroy(seat->pointer.confined_pointer);
                seat->pointer.confined_pointer = NULL;
            }

            SDL_WindowData *w = seat->pointer.focus;
            if (!w) {
                return;
            }

            SDL_Window *window = w->sdlwindow;

            // Don't confine the pointer if the window doesn't have input focus, or it shouldn't be confined.
            if (!(window->flags & SDL_WINDOW_INPUT_FOCUS) ||
                (!(window->flags & SDL_WINDOW_MOUSE_GRABBED) && SDL_RectEmpty(&window->mouse_rect))) {
                return;
            }

            struct wl_region *confine_rect = NULL;
            if (!SDL_RectEmpty(&window->mouse_rect)) {
                SDL_Rect scaled_mouse_rect;
                Wayland_GetScaledMouseRect(window, &scaled_mouse_rect);

                confine_rect = wl_compositor_create_region(display->compositor);
                wl_region_add(confine_rect,
                              scaled_mouse_rect.x,
                              scaled_mouse_rect.y,
                              scaled_mouse_rect.w,
                              scaled_mouse_rect.h);

                /* Some compositors will only confine the pointer to an arbitrary region if the pointer
                 * is already within the confinement area when it is created. Warp the pointer to the
                 * closest point within the confinement zone if outside.
                 */
                if (!SDL_PointInRect(&seat->pointer.last_motion, &scaled_mouse_rect)) {
                    /* Warp the pointer to the closest point within the confinement zone if outside,
                     * The confinement region will be created when a true position event is received.
                     */
                    int closest_x = seat->pointer.last_motion.x;
                    int closest_y = seat->pointer.last_motion.y;

                    if (closest_x < scaled_mouse_rect.x) {
                        closest_x = scaled_mouse_rect.x;
                    } else if (closest_x >= scaled_mouse_rect.x + scaled_mouse_rect.w) {
                        closest_x = (scaled_mouse_rect.x + scaled_mouse_rect.w) - 1;
                    }

                    if (closest_y < scaled_mouse_rect.y) {
                        closest_y = scaled_mouse_rect.y;
                    } else if (closest_y >= scaled_mouse_rect.y + scaled_mouse_rect.h) {
                        closest_y = (scaled_mouse_rect.y + scaled_mouse_rect.h) - 1;
                    }

                    Wayland_SeatWarpMouse(seat, w, closest_x, closest_y);
                }
            }

            if (confine_rect || (window->flags & SDL_WINDOW_MOUSE_GRABBED)) {
                if (window->mouse_rect.w != 1 && window->mouse_rect.h != 1) {
                    seat->pointer.confined_pointer =
                        zwp_pointer_constraints_v1_confine_pointer(display->pointer_constraints,
                                                                   w->surface,
                                                                   seat->pointer.wl_pointer,
                                                                   confine_rect,
                                                                   ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
                    zwp_confined_pointer_v1_add_listener(seat->pointer.confined_pointer,
                                                         &confined_pointer_listener,
                                                         seat);
                } else {
                    /* Use a lock for 1x1 confinement regions, as the pointer can exhibit subpixel motion otherwise.
                     * A null region is used since the warp *should* have placed the pointer where we want it, but
                     * better to lock it slightly off than let the pointer escape, as confining to a specific region
                     * seems to be a racy operation on some compositors.
                     */
                    seat->pointer.locked_pointer =
                        zwp_pointer_constraints_v1_lock_pointer(display->pointer_constraints,
                                                                w->surface,
                                                                seat->pointer.wl_pointer,
                                                                NULL,
                                                                ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
                    zwp_locked_pointer_v1_add_listener(seat->pointer.locked_pointer,
                                                       &locked_pointer_listener,
                                                       seat);
                }
                if (confine_rect) {
                    wl_region_destroy(confine_rect);
                }
            }
        }
    }
}

void Wayland_DisplayUpdatePointerGrabs(SDL_VideoData *display, SDL_WindowData *window)
{
    SDL_WaylandSeat *seat;
    wl_list_for_each (seat, &display->seat_list, link) {
        if (!window || seat->pointer.focus == window) {
            Wayland_SeatUpdatePointerGrab(seat);
        }
    }
}

void Wayland_DisplayUpdateKeyboardGrabs(SDL_VideoData *display, SDL_WindowData *window)
{
    SDL_WaylandSeat *seat;
    wl_list_for_each (seat, &display->seat_list, link) {
        if (!window || seat->keyboard.focus == window) {
            Wayland_SeatUpdateKeyboardGrab(seat);
        }
    }
}

void Wayland_UpdateImplicitGrabSerial(SDL_WaylandSeat *seat, Uint32 serial)
{
    if (serial > seat->last_implicit_grab_serial) {
        seat->last_implicit_grab_serial = serial;
        seat->display->last_implicit_grab_seat = seat;
        Wayland_data_device_set_serial(seat->data_device, serial);
        Wayland_primary_selection_device_set_serial(seat->primary_selection_device, serial);
    }
}

#endif // SDL_VIDEO_DRIVER_WAYLAND
