kc3-lang/SDL/src/video/wayland/SDL_waylandevents.c

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• Hash : 9e6249fa
  Author :
  Date : 2022-01-08T19:24:47
  

  wayland: Avoid spurious key repeats when not pumping events Previous to this commit, key repeats events were typically generated when pumping events, based on the time of when the events are pumped. However, if an application doesn't call `SDL_PumpEvents` for some seconds, this time can be multiple seconds in the future compared to the actual key up event time, and generates key repeats even if a key was pressed only for an instant. In practice, this can happen when the user presses a key which causes the application to do something without pumping events (e.g. load a level). In Crispy Doom & PrBoom+, when the user presses the key bound to "Restart level/demo", the game doesn't pump events during the "screen melt" effect, and the level is restarted multiple times due to spurious repeats. To fix this, if the key up event is among the events to be pumped, we generate the key repeats there, since in the Wayland callback we receive the time when the key up event happened. Otherwise, we know no key up event happened and we can generate as many repeats as necessary after pumping. Signed-off-by: Joan Bruguera <joanbrugueram@gmail.com>

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• src/video/wayland/SDL_waylandevents.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2022 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"
  
  #if SDL_VIDEO_DRIVER_WAYLAND
  
  #include "SDL_stdinc.h"
  #include "SDL_timer.h"
  
  #include "../../core/unix/SDL_poll.h"
  #include "../../events/SDL_sysevents.h"
  #include "../../events/SDL_events_c.h"
  #include "../../events/scancodes_xfree86.h"
  
  #include "SDL_waylandvideo.h"
  #include "SDL_waylandevents_c.h"
  #include "SDL_waylandwindow.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"
  
  #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 <sys/select.h>
  #include <sys/mman.h>
  #include <poll.h>
  #include <unistd.h>
  #include <errno.h>
  #include <xkbcommon/xkbcommon.h>
  #include <xkbcommon/xkbcommon-compose.h>
  #include "../../events/imKStoUCS.h"
  
  /* Weston uses a ratio of 10 units per scroll tick */
  #define WAYLAND_WHEEL_AXIS_UNIT 10
  
  static const struct {
      xkb_keysym_t keysym;
      SDL_KeyCode keycode;
  } KeySymToSDLKeyCode[] = {
      { XKB_KEY_Shift_L, SDLK_LSHIFT },
      { XKB_KEY_Shift_R, SDLK_RSHIFT },
      { XKB_KEY_Control_L, SDLK_LCTRL },
      { XKB_KEY_Control_R, SDLK_RCTRL },
      { XKB_KEY_Caps_Lock, SDLK_CAPSLOCK },
      { XKB_KEY_Alt_L, SDLK_LALT },
      { XKB_KEY_Alt_R, SDLK_RALT },
      { XKB_KEY_Meta_L, SDLK_LGUI },
      { XKB_KEY_Meta_R, SDLK_RGUI },
      { XKB_KEY_Super_L, SDLK_LGUI },
      { XKB_KEY_Super_R, SDLK_RGUI },
      { XKB_KEY_Hyper_L, SDLK_LGUI },
      { XKB_KEY_Hyper_R, SDLK_RGUI },
  };
  
  struct SDL_WaylandTouchPoint {
      SDL_TouchID id;
      float x;
      float y;
      struct wl_surface* surface;
  
      struct SDL_WaylandTouchPoint* prev;
      struct SDL_WaylandTouchPoint* next;
  };
  
  struct SDL_WaylandTouchPointList {
      struct SDL_WaylandTouchPoint* head;
      struct SDL_WaylandTouchPoint* tail;
  };
  
  static struct SDL_WaylandTouchPointList touch_points = {NULL, NULL};
  
  static SDL_KeyCode
  Wayland_KeySymToSDLKeyCode(xkb_keysym_t keysym)
  {
      int i;
  
      for (i = 0; i < SDL_arraysize(KeySymToSDLKeyCode); ++i) {
          if (keysym == KeySymToSDLKeyCode[i].keysym) {
              return KeySymToSDLKeyCode[i].keycode;
          }
      }
      return SDLK_UNKNOWN;
  }
  
  static void
  touch_add(SDL_TouchID id, float x, float y, struct wl_surface *surface)
  {
      struct SDL_WaylandTouchPoint* tp = SDL_malloc(sizeof(struct SDL_WaylandTouchPoint));
  
      tp->id = id;
      tp->x = x;
      tp->y = y;
      tp->surface = surface;
  
      if (touch_points.tail) {
          touch_points.tail->next = tp;
          tp->prev = touch_points.tail;
      } else {
          touch_points.head = tp;
          tp->prev = NULL;
      }
  
      touch_points.tail = tp;
      tp->next = NULL;
  }
  
  static void
  touch_update(SDL_TouchID id, float x, float y)
  {
      struct SDL_WaylandTouchPoint* tp = touch_points.head;
  
      while (tp) {
          if (tp->id == id) {
              tp->x = x;
              tp->y = y;
          }
  
          tp = tp->next;
      }
  }
  
  static void
  touch_del(SDL_TouchID id, float* x, float* y, struct wl_surface **surface)
  {
      struct SDL_WaylandTouchPoint* tp = touch_points.head;
  
      while (tp) {
          if (tp->id == id) {
              *x = tp->x;
              *y = tp->y;
              *surface = tp->surface;
  
              if (tp->prev) {
                  tp->prev->next = tp->next;
              } else {
                  touch_points.head = tp->next;
              }
  
              if (tp->next) {
                  tp->next->prev = tp->prev;
              } else {
                  touch_points.tail = tp->prev;
              }
  
              {
                  struct SDL_WaylandTouchPoint *next = tp->next;
                  SDL_free(tp);
                  tp = next;
              }
          } else {
              tp = tp->next;
          }
      }
  }
  
  static struct wl_surface*
  touch_surface(SDL_TouchID id)
  {
      struct SDL_WaylandTouchPoint* tp = touch_points.head;
  
      while (tp) {
          if (tp->id == id) {
              return tp->surface;
          }
  
          tp = tp->next;
      }
  
      return NULL;
  }
  
  /* Returns SDL_TRUE if a key repeat event was due */
  static SDL_bool
  keyboard_repeat_handle(SDL_WaylandKeyboardRepeat* repeat_info, uint32_t elapsed)
  {
      SDL_bool ret = SDL_FALSE;
      while ((elapsed - repeat_info->next_repeat_ms) < 0x80000000U) {
          if (repeat_info->scancode != SDL_SCANCODE_UNKNOWN) {
              SDL_SendKeyboardKey(SDL_PRESSED, repeat_info->scancode);
          }
          if (repeat_info->text[0]) {
              SDL_SendKeyboardText(repeat_info->text);
          }
          repeat_info->next_repeat_ms += 1000 / repeat_info->repeat_rate;
          ret = SDL_TRUE;
      }
      return ret;
  }
  
  static void
  keyboard_repeat_clear(SDL_WaylandKeyboardRepeat* repeat_info) {
      if (!repeat_info->is_initialized) {
          return;
      }
      repeat_info->is_key_down = SDL_FALSE;
  }
  
  static void
  keyboard_repeat_set(SDL_WaylandKeyboardRepeat* repeat_info, uint32_t wl_press_time,
                      uint32_t scancode, SDL_bool has_text, char text[8]) {
      if (!repeat_info->is_initialized || !repeat_info->repeat_rate) {
          return;
      }
      repeat_info->is_key_down = SDL_TRUE;
      repeat_info->wl_press_time = wl_press_time;
      repeat_info->sdl_press_time = SDL_GetTicks();
      repeat_info->next_repeat_ms = repeat_info->repeat_delay;
      repeat_info->scancode = scancode;
      if (has_text) {
          SDL_memcpy(repeat_info->text, text, 8);
      } else {
          repeat_info->text[0] = '\0';
      }
  }
  
  static SDL_bool keyboard_repeat_is_set(SDL_WaylandKeyboardRepeat* repeat_info) {
      return repeat_info->is_initialized && repeat_info->is_key_down;
  }
  
  void
  Wayland_SendWakeupEvent(_THIS, SDL_Window *window)
  {
      SDL_VideoData *d = _this->driverdata;
  
      /* TODO: Maybe use a pipe to avoid the compositor roundtrip? */
      wl_display_sync(d->display);
      WAYLAND_wl_display_flush(d->display);
  }
  
  int
  Wayland_WaitEventTimeout(_THIS, int timeout)
  {
      SDL_VideoData *d = _this->driverdata;
      struct SDL_WaylandInput *input = d->input;
      SDL_bool key_repeat_active = SDL_FALSE;
  
      WAYLAND_wl_display_flush(d->display);
  
  #ifdef SDL_USE_IME
      if (d->text_input_manager == NULL && SDL_GetEventState(SDL_TEXTINPUT) == SDL_ENABLE) {
          SDL_IME_PumpEvents();
      }
  #endif
  
      /* If key repeat is active, we'll need to cap our maximum wait time to handle repeats */
      if (input && keyboard_repeat_is_set(&input->keyboard_repeat)) {
          uint32_t elapsed = SDL_GetTicks() - input->keyboard_repeat.sdl_press_time;
          if (keyboard_repeat_handle(&input->keyboard_repeat, elapsed)) {
              /* A repeat key event was already due */
              return 1;
          } else {
              uint32_t next_repeat_wait_time = (input->keyboard_repeat.next_repeat_ms - elapsed) + 1;
              if (timeout >= 0) {
                  timeout = SDL_min(timeout, next_repeat_wait_time);
              } else {
                  timeout = next_repeat_wait_time;
              }
              key_repeat_active = SDL_TRUE;
          }
      }
  
      /* wl_display_prepare_read() will return -1 if the default queue is not empty.
       * If the default queue is empty, it will prepare us for our SDL_IOReady() call. */
      if (WAYLAND_wl_display_prepare_read(d->display) == 0) {
          /* Use SDL_IOR_NO_RETRY to ensure SIGINT will break us out of our wait */
          int err = SDL_IOReady(WAYLAND_wl_display_get_fd(d->display), SDL_IOR_READ | SDL_IOR_NO_RETRY, timeout);
          if (err > 0) {
              /* There are new events available to read */
              WAYLAND_wl_display_read_events(d->display);
              WAYLAND_wl_display_dispatch_pending(d->display);
              return 1;
          } else if (err == 0) {
              /* No events available within the timeout */
              WAYLAND_wl_display_cancel_read(d->display);
  
              /* If key repeat is active, we might have woken up to generate a key event */
              if (key_repeat_active) {
                  uint32_t elapsed = SDL_GetTicks() - input->keyboard_repeat.sdl_press_time;
                  if (keyboard_repeat_handle(&input->keyboard_repeat, elapsed)) {
                      return 1;
                  }
              }
  
              return 0;
          } else {
              /* Error returned from poll()/select() */
              WAYLAND_wl_display_cancel_read(d->display);
  
              if (errno == EINTR) {
                  /* If the wait was interrupted by a signal, we may have generated a
                   * SDL_QUIT event. Let the caller know to call SDL_PumpEvents(). */
                  return 1;
              } else {
                  return err;
              }
          }
      } else {
          /* We already had pending events */
          WAYLAND_wl_display_dispatch_pending(d->display);
          return 1;
      }
  }
  
  void
  Wayland_PumpEvents(_THIS)
  {
      SDL_VideoData *d = _this->driverdata;
      struct SDL_WaylandInput *input = d->input;
      int err;
  
      WAYLAND_wl_display_flush(d->display);
  
  #ifdef SDL_USE_IME
      if (d->text_input_manager == NULL && SDL_GetEventState(SDL_TEXTINPUT) == SDL_ENABLE) {
          SDL_IME_PumpEvents();
      }
  #endif
  
      /* wl_display_prepare_read() will return -1 if the default queue is not empty.
       * If the default queue is empty, it will prepare us for our SDL_IOReady() call. */
      if (WAYLAND_wl_display_prepare_read(d->display) == 0) {
          if (SDL_IOReady(WAYLAND_wl_display_get_fd(d->display), SDL_IOR_READ, 0) > 0) {
              WAYLAND_wl_display_read_events(d->display);
          } else {
              WAYLAND_wl_display_cancel_read(d->display);
          }
      }
  
      /* Dispatch any pre-existing pending events or new events we may have read */
      err = WAYLAND_wl_display_dispatch_pending(d->display);
  
      if (input && keyboard_repeat_is_set(&input->keyboard_repeat)) {
          uint32_t elapsed = SDL_GetTicks() - input->keyboard_repeat.sdl_press_time;
          keyboard_repeat_handle(&input->keyboard_repeat, elapsed);
      }
  
      if (err == -1 && !d->display_disconnected) {
          /* Something has failed with the Wayland connection -- for example,
           * the compositor may have shut down and closed its end of the socket,
           * or there is a library-specific error. No recovery is possible. */
          d->display_disconnected = 1;
          /* Only send a single quit message, as application shutdown might call
           * SDL_PumpEvents */
          SDL_SendQuit();
      }
  }
  
  static void
  pointer_handle_motion(void *data, struct wl_pointer *pointer,
                        uint32_t time, wl_fixed_t sx_w, wl_fixed_t sy_w)
  {
      struct SDL_WaylandInput *input = data;
      SDL_WindowData *window = input->pointer_focus;
      input->sx_w = sx_w;
      input->sy_w = sy_w;
      if (input->pointer_focus) {
          const int sx = wl_fixed_to_int(sx_w);
          const int sy = wl_fixed_to_int(sy_w);
          SDL_SendMouseMotion(window->sdlwindow, 0, 0, sx, sy);
      }
  }
  
  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)
  {
      struct SDL_WaylandInput *input = data;
      SDL_WindowData *window;
  
      if (!surface) {
          /* enter event for a window we've just destroyed */
          return;
      }
  
      /* check that this surface belongs to one of the SDL windows */
      if (!SDL_WAYLAND_own_surface(surface)) {
          return;
      }
  
      /* This handler will be called twice in Wayland 1.4
       * Once for the window surface which has valid user data
       * and again for the mouse cursor surface which does not have valid user data
       * We ignore the later
       */
  
      window = (SDL_WindowData *)wl_surface_get_user_data(surface);
  
      if (window) {
          input->pointer_focus = window;
          input->pointer_enter_serial = serial;
          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. */
          pointer_handle_motion(data, pointer, serial, sx_w, sy_w);
          /* 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. */
          SDL_SetCursor(NULL);
      }
  }
  
  static void
  pointer_handle_leave(void *data, struct wl_pointer *pointer,
                       uint32_t serial, struct wl_surface *surface)
  {
      struct SDL_WaylandInput *input = data;
  
      if (!surface || !SDL_WAYLAND_own_surface(surface)) {
          return;
      }
  
      if (input->pointer_focus) {
          SDL_SetMouseFocus(NULL);
          input->pointer_focus = NULL;
      }
  }
  
  static SDL_bool
  ProcessHitTest(struct SDL_WaylandInput *input, uint32_t serial)
  {
      SDL_WindowData *window_data = input->pointer_focus;
      SDL_Window *window = window_data->sdlwindow;
  
      if (window->hit_test) {
          const SDL_Point point = { wl_fixed_to_int(input->sx_w), wl_fixed_to_int(input->sy_w) };
          const SDL_HitTestResult rc = window->hit_test(window, &point, window->hit_test_data);
  
          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
          /* ditto for libdecor. */
          const uint32_t *directions_libdecor = directions;
  #endif
  
          switch (rc) {
              case SDL_HITTEST_DRAGGABLE:
  #ifdef HAVE_LIBDECOR_H
                  if (input->display->shell.libdecor) {
                      if (window_data->shell_surface.libdecor.frame) {
                          libdecor_frame_move(window_data->shell_surface.libdecor.frame, input->seat, serial);
                      }
                  } else
  #endif
                  if (input->display->shell.xdg) {
                      if (window_data->shell_surface.xdg.roleobj.toplevel) {
                          xdg_toplevel_move(window_data->shell_surface.xdg.roleobj.toplevel,
                                            input->seat,
                                            serial);
                      }
                  }
                  return SDL_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 (input->display->shell.libdecor) {
                      if (window_data->shell_surface.libdecor.frame) {
                          libdecor_frame_resize(window_data->shell_surface.libdecor.frame, input->seat, serial, directions_libdecor[rc - SDL_HITTEST_RESIZE_TOPLEFT]);
                      }
                  } else
  #endif
                  if (input->display->shell.xdg) {
                      if (window_data->shell_surface.xdg.roleobj.toplevel) {
                          xdg_toplevel_resize(window_data->shell_surface.xdg.roleobj.toplevel,
                                              input->seat,
                                              serial,
                                              directions[rc - SDL_HITTEST_RESIZE_TOPLEFT]);
                      }
                  }
                  return SDL_TRUE;
  
              default: return SDL_FALSE;
          }
      }
  
      return SDL_FALSE;
  }
  
  static void
  pointer_handle_button_common(struct SDL_WaylandInput *input, uint32_t serial,
                               uint32_t time, uint32_t button, uint32_t state_w)
  {
      SDL_WindowData *window = input->pointer_focus;
      enum wl_pointer_button_state state = state_w;
      uint32_t sdl_button;
  
      if  (input->pointer_focus) {
          switch (button) {
              case BTN_LEFT:
                  sdl_button = SDL_BUTTON_LEFT;
                  if (ProcessHitTest(input, serial)) {
                      return;  /* don't pass this event on to app. */
                  }
                  break;
              case BTN_MIDDLE:
                  sdl_button = SDL_BUTTON_MIDDLE;
                  break;
              case BTN_RIGHT:
                  sdl_button = SDL_BUTTON_RIGHT;
                  break;
              case BTN_SIDE:
                  sdl_button = SDL_BUTTON_X1;
                  break;
              case BTN_EXTRA:
                  sdl_button = SDL_BUTTON_X2;
                  break;
              default:
                  return;
          }
  
          Wayland_data_device_set_serial(input->data_device, serial);
  
          SDL_SendMouseButton(window->sdlwindow, 0,
                              state ? SDL_PRESSED : SDL_RELEASED, sdl_button);
      }
  }
  
  static void
  pointer_handle_button(void *data, struct wl_pointer *pointer, uint32_t serial,
                        uint32_t time, uint32_t button, uint32_t state_w)
  {
      struct SDL_WaylandInput *input = data;
  
      pointer_handle_button_common(input, serial, time, button, state_w);
  }
  
  static void
  pointer_handle_axis_common_v1(struct SDL_WaylandInput *input,
                                uint32_t time, uint32_t axis, wl_fixed_t value)
  {
      SDL_WindowData *window = input->pointer_focus;
      enum wl_pointer_axis a = axis;
      float x, y;
  
      if (input->pointer_focus) {
          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 = 0 - (float)wl_fixed_to_double(value);
                  y = 0;
                  break;
              default:
                  return;
          }
  
          x /= WAYLAND_WHEEL_AXIS_UNIT;
          y /= WAYLAND_WHEEL_AXIS_UNIT;
  
          SDL_SendMouseWheel(window->sdlwindow, 0, x, y, SDL_MOUSEWHEEL_NORMAL);
      }
  }
  
  static void
  pointer_handle_axis_common(struct SDL_WaylandInput *input, SDL_bool discrete,
                             uint32_t axis, wl_fixed_t value)
  {
      enum wl_pointer_axis a = axis;
  
      if (input->pointer_focus) {
          switch (a) {
              case WL_POINTER_AXIS_VERTICAL_SCROLL:
                  if (discrete) {
                      /* this is a discrete axis event so we process it and flag
                       * to ignore future continuous axis events in this frame */
                      input->pointer_curr_axis_info.is_y_discrete = SDL_TRUE;
                  } else if(input->pointer_curr_axis_info.is_y_discrete) {
                      /* this is a continuous axis event and we have already
                       * processed a discrete axis event before so we ignore it */
                      break;
                  }
                  input->pointer_curr_axis_info.y = 0 - (float)wl_fixed_to_double(value);
                  break;
              case WL_POINTER_AXIS_HORIZONTAL_SCROLL:
                  if (discrete) {
                      /* this is a discrete axis event so we process it and flag
                       * to ignore future continuous axis events in this frame */
                      input->pointer_curr_axis_info.is_x_discrete = SDL_TRUE;
                  } else if(input->pointer_curr_axis_info.is_x_discrete) {
                      /* this is a continuous axis event and we have already
                       * processed a discrete axis event before so we ignore it */
                      break;
                  }
                  input->pointer_curr_axis_info.x = 0 - (float)wl_fixed_to_double(value);
                  break;
          }
      }
  }
  
  static void
  pointer_handle_axis(void *data, struct wl_pointer *pointer,
                      uint32_t time, uint32_t axis, wl_fixed_t value)
  {
      struct SDL_WaylandInput *input = data;
  
      if(wl_seat_get_version(input->seat) >= 5)
          pointer_handle_axis_common(input, SDL_FALSE, axis, value);
      else
          pointer_handle_axis_common_v1(input, time, axis, value);
  }
  
  static void
  pointer_handle_frame(void *data, struct wl_pointer *pointer)
  {
      struct SDL_WaylandInput *input = data;
      SDL_WindowData *window = input->pointer_focus;
      float x, y;
  
      if (input->pointer_curr_axis_info.is_x_discrete)
          x = input->pointer_curr_axis_info.x;
      else
          x = input->pointer_curr_axis_info.x / WAYLAND_WHEEL_AXIS_UNIT;
  
      if (input->pointer_curr_axis_info.is_y_discrete)
          y = input->pointer_curr_axis_info.y;
      else
          y = input->pointer_curr_axis_info.y / WAYLAND_WHEEL_AXIS_UNIT;
  
      /* clear pointer_curr_axis_info for next frame */
      SDL_memset(&input->pointer_curr_axis_info, 0, sizeof input->pointer_curr_axis_info);
  
      if(x == 0.0f && y == 0.0f)
          return;
      else
          SDL_SendMouseWheel(window->sdlwindow, 0, x, y, SDL_MOUSEWHEEL_NORMAL);
  }
  
  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)
  {
      struct SDL_WaylandInput *input = data;
  
      pointer_handle_axis_common(input, SDL_TRUE, axis, wl_fixed_from_int(discrete));
  }
  
  
  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
  };
  
  static void
  touch_handler_down(void *data, struct wl_touch *touch, unsigned int serial,
                     unsigned int timestamp, struct wl_surface *surface,
                     int id, wl_fixed_t fx, wl_fixed_t fy)
  {
      SDL_WindowData *window_data = (SDL_WindowData *)wl_surface_get_user_data(surface);
      const double dblx = wl_fixed_to_double(fx);
      const double dbly = wl_fixed_to_double(fy);
      const float x = dblx / window_data->sdlwindow->w;
      const float y = dbly / window_data->sdlwindow->h;
  
      touch_add(id, x, y, surface);
  
      SDL_SendTouch((SDL_TouchID)(intptr_t)touch, (SDL_FingerID)id, window_data->sdlwindow, SDL_TRUE, x, y, 1.0f);
  }
  
  static void
  touch_handler_up(void *data, struct wl_touch *touch, unsigned int serial,
                   unsigned int timestamp, int id)
  {
      float x = 0, y = 0;
      struct wl_surface *surface = NULL;
      SDL_Window *window = NULL;
  
      touch_del(id, &x, &y, &surface);
  
      if (surface) {
          SDL_WindowData *window_data = (SDL_WindowData *)wl_surface_get_user_data(surface);
          window = window_data->sdlwindow;
      }
  
      SDL_SendTouch((SDL_TouchID)(intptr_t)touch, (SDL_FingerID)id, window, SDL_FALSE, x, y, 0.0f);
  }
  
  static void
  touch_handler_motion(void *data, struct wl_touch *touch, unsigned int timestamp,
                       int id, wl_fixed_t fx, wl_fixed_t fy)
  {
      SDL_WindowData *window_data = (SDL_WindowData *)wl_surface_get_user_data(touch_surface(id));
      const double dblx = wl_fixed_to_double(fx);
      const double dbly = wl_fixed_to_double(fy);
      const float x = dblx / window_data->sdlwindow->w;
      const float y = dbly / window_data->sdlwindow->h;
  
      touch_update(id, x, y);
      SDL_SendTouchMotion((SDL_TouchID)(intptr_t)touch, (SDL_FingerID)id, 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)
  {
  
  }
  
  static const struct wl_touch_listener touch_listener = {
      touch_handler_down,
      touch_handler_up,
      touch_handler_motion,
      touch_handler_frame,
      touch_handler_cancel,
      NULL, /* shape */
      NULL, /* orientation */
  };
  
  static void
  keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
                         uint32_t format, int fd, uint32_t size)
  {
      struct SDL_WaylandInput *input = data;
      char *map_str;
      const char *locale;
  
      if (!data) {
          close(fd);
          return;
      }
  
      if (format != WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1) {
          close(fd);
          return;
      }
  
      map_str = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
      if (map_str == MAP_FAILED) {
          close(fd);
          return;
      }
  
      input->xkb.keymap = WAYLAND_xkb_keymap_new_from_string(input->display->xkb_context,
                                                  map_str,
                                                  XKB_KEYMAP_FORMAT_TEXT_V1,
                                                  0);
      munmap(map_str, size);
      close(fd);
  
      if (!input->xkb.keymap) {
          fprintf(stderr, "failed to compile keymap\n");
          return;
      }
  
      input->xkb.state = WAYLAND_xkb_state_new(input->xkb.keymap);
      if (!input->xkb.state) {
          fprintf(stderr, "failed to create XKB state\n");
          WAYLAND_xkb_keymap_unref(input->xkb.keymap);
          input->xkb.keymap = NULL;
          return;
      }
  
      /*
       * 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 */
      if (!(locale = SDL_getenv("LC_ALL")))
          if (!(locale = SDL_getenv("LC_CTYPE")))
              if (!(locale = SDL_getenv("LANG")))
                  locale = "C";
      /* Set up XKB compose table */
      input->xkb.compose_table = WAYLAND_xkb_compose_table_new_from_locale(input->display->xkb_context,
                                                locale, XKB_COMPOSE_COMPILE_NO_FLAGS);
      if (input->xkb.compose_table) {
          /* Set up XKB compose state */
          input->xkb.compose_state = WAYLAND_xkb_compose_state_new(input->xkb.compose_table,
                                                XKB_COMPOSE_STATE_NO_FLAGS);
          if (!input->xkb.compose_state) {
              fprintf(stderr, "could not create XKB compose state\n");
              WAYLAND_xkb_compose_table_unref(input->xkb.compose_table);
              input->xkb.compose_table = NULL;
          }
      }
  }
  
  static void
  keyboard_handle_enter(void *data, struct wl_keyboard *keyboard,
                        uint32_t serial, struct wl_surface *surface,
                        struct wl_array *keys)
  {
      struct SDL_WaylandInput *input = data;
      SDL_WindowData *window;
  
      if (!surface) {
          /* enter event for a window we've just destroyed */
          return;
      }
  
      if (!SDL_WAYLAND_own_surface(surface)) {
          return;
      }
  
      window = wl_surface_get_user_data(surface);
  
      if (window) {
          input->keyboard_focus = window;
          window->keyboard_device = input;
          SDL_SetKeyboardFocus(window->sdlwindow);
      }
  #ifdef SDL_USE_IME
      if (!input->text_input) {
          SDL_IME_SetFocus(SDL_TRUE);
      }
  #endif
  }
  
  static void
  keyboard_handle_leave(void *data, struct wl_keyboard *keyboard,
                        uint32_t serial, struct wl_surface *surface)
  {
      struct SDL_WaylandInput *input = data;
  
      if (!surface || !SDL_WAYLAND_own_surface(surface)) {
          return;
      }
  
      /* Stop key repeat before clearing keyboard focus */
      keyboard_repeat_clear(&input->keyboard_repeat);
  
      /* This will release any keys still pressed */
      SDL_SetKeyboardFocus(NULL);
  
  #ifdef SDL_USE_IME
      if (!input->text_input) {
          SDL_IME_SetFocus(SDL_FALSE);
      }
  #endif
  }
  
  static SDL_bool
  keyboard_input_get_text(char text[8], const struct SDL_WaylandInput *input, uint32_t key, SDL_bool *handled_by_ime)
  {
      SDL_WindowData *window = input->keyboard_focus;
      const xkb_keysym_t *syms;
      xkb_keysym_t sym;
  
      if (!window || window->keyboard_device != input || !input->xkb.state) {
          return SDL_FALSE;
      }
  
      // TODO can this happen?
      if (WAYLAND_xkb_state_key_get_syms(input->xkb.state, key + 8, &syms) != 1) {
          return SDL_FALSE;
      }
      sym = syms[0];
  
  #ifdef SDL_USE_IME
      if (SDL_IME_ProcessKeyEvent(sym, key + 8)) {
          *handled_by_ime = SDL_TRUE;
          return SDL_TRUE;
      }
  #endif
  
      if (input->xkb.compose_state && WAYLAND_xkb_compose_state_feed(input->xkb.compose_state, sym) == XKB_COMPOSE_FEED_ACCEPTED) {
          switch(WAYLAND_xkb_compose_state_get_status(input->xkb.compose_state)) {
              case XKB_COMPOSE_COMPOSING:
                  *handled_by_ime = SDL_TRUE;
                  return SDL_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(input->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)
  {
      struct SDL_WaylandInput *input = data;
      enum wl_keyboard_key_state state = state_w;
      uint32_t scancode = SDL_SCANCODE_UNKNOWN;
      char text[8];
      SDL_bool has_text = SDL_FALSE;
      SDL_bool handled_by_ime = SDL_FALSE;
  
      if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
          has_text = keyboard_input_get_text(text, input, key, &handled_by_ime);
      } else {
          if (keyboard_repeat_is_set(&input->keyboard_repeat)) {
              // 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
              keyboard_repeat_handle(&input->keyboard_repeat, time - input->keyboard_repeat.wl_press_time);
              keyboard_repeat_clear(&input->keyboard_repeat);
          }
      }
  
      if (!handled_by_ime && key < SDL_arraysize(xfree86_scancode_table2)) {
          scancode = xfree86_scancode_table2[key];
  
          if (scancode != SDL_SCANCODE_UNKNOWN) {
              SDL_SendKeyboardKey(state == WL_KEYBOARD_KEY_STATE_PRESSED ?
                                  SDL_PRESSED : SDL_RELEASED, scancode);
          }
      }
  
      if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
          if (has_text && !(SDL_GetModState() & KMOD_CTRL)) {
              Wayland_data_device_set_serial(input->data_device, serial);
              if (!handled_by_ime) {
                  SDL_SendKeyboardText(text);
              }
          }
          keyboard_repeat_set(&input->keyboard_repeat, time, scancode, has_text, text);
      }
  }
  
  typedef struct Wayland_Keymap
  {
      xkb_layout_index_t layout;
      SDL_Keycode keymap[SDL_NUM_SCANCODES];
  } Wayland_Keymap;
  
  static void
  Wayland_keymap_iter(struct xkb_keymap *keymap, xkb_keycode_t key, void *data)
  {
      const xkb_keysym_t *syms;
      Wayland_Keymap *sdlKeymap = (Wayland_Keymap *)data;
  
      if ((key - 8) < SDL_arraysize(xfree86_scancode_table2)) {
          SDL_Scancode scancode = xfree86_scancode_table2[key - 8];
          if (scancode == SDL_SCANCODE_UNKNOWN) {
              return;
          }
  
          if (WAYLAND_xkb_keymap_key_get_syms_by_level(keymap, key, sdlKeymap->layout, 0, &syms) > 0) {
              uint32_t keycode = SDL_KeySymToUcs4(syms[0]);
  
              if (!keycode) {
                  keycode = Wayland_KeySymToSDLKeyCode(syms[0]);
              }
  
              if (keycode) {
                  sdlKeymap->keymap[scancode] = keycode;
              } else {
                  switch (scancode) {
                      case SDL_SCANCODE_RETURN:
                          sdlKeymap->keymap[scancode] = SDLK_RETURN;
                          break;
                      case SDL_SCANCODE_ESCAPE:
                          sdlKeymap->keymap[scancode] = SDLK_ESCAPE;
                          break;
                      case SDL_SCANCODE_BACKSPACE:
                          sdlKeymap->keymap[scancode] = SDLK_BACKSPACE;
                          break;
                      case SDL_SCANCODE_TAB:
                          sdlKeymap->keymap[scancode] = SDLK_TAB;
                          break;
                      case SDL_SCANCODE_DELETE:
                          sdlKeymap->keymap[scancode] = SDLK_DELETE;
                          break;
                      default:
                          sdlKeymap->keymap[scancode] = SDL_SCANCODE_TO_KEYCODE(scancode);
                          break;
                  }
              }
          }
      }
  }
  
  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)
  {
      struct SDL_WaylandInput *input = data;
      Wayland_Keymap keymap;
  
      WAYLAND_xkb_state_update_mask(input->xkb.state, mods_depressed, mods_latched,
                            mods_locked, 0, 0, group);
  
      keymap.layout = group;
      SDL_GetDefaultKeymap(keymap.keymap);
      WAYLAND_xkb_keymap_key_for_each(input->xkb.keymap,
                                      Wayland_keymap_iter,
                                      &keymap);
      SDL_SetKeymap(0, keymap.keymap, SDL_NUM_SCANCODES);
      SDL_SendKeymapChangedEvent();
  }
  
  static void
  keyboard_handle_repeat_info(void *data, struct wl_keyboard *wl_keyboard,
                              int32_t rate, int32_t delay)
  {
      struct SDL_WaylandInput *input = data;
      input->keyboard_repeat.repeat_rate = SDL_clamp(rate, 0, 1000);
      input->keyboard_repeat.repeat_delay = delay;
      input->keyboard_repeat.is_initialized = SDL_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
  seat_handle_capabilities(void *data, struct wl_seat *seat,
                           enum wl_seat_capability caps)
  {
      struct SDL_WaylandInput *input = data;
  
      if ((caps & WL_SEAT_CAPABILITY_POINTER) && !input->pointer) {
          input->pointer = wl_seat_get_pointer(seat);
          SDL_memset(&input->pointer_curr_axis_info, 0, sizeof input->pointer_curr_axis_info);
          input->display->pointer = input->pointer;
          wl_pointer_set_user_data(input->pointer, input);
          wl_pointer_add_listener(input->pointer, &pointer_listener,
                                  input);
      } else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && input->pointer) {
          wl_pointer_destroy(input->pointer);
          input->pointer = NULL;
          input->display->pointer = NULL;
      }
  
      if ((caps & WL_SEAT_CAPABILITY_TOUCH) && !input->touch) {
          input->touch = wl_seat_get_touch(seat);
          SDL_AddTouch((SDL_TouchID)(intptr_t)input->touch, SDL_TOUCH_DEVICE_DIRECT, "wayland_touch");
          wl_touch_set_user_data(input->touch, input);
          wl_touch_add_listener(input->touch, &touch_listener,
                                   input);
      } else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && input->touch) {
          SDL_DelTouch((SDL_TouchID)(intptr_t)input->touch);
          wl_touch_destroy(input->touch);
          input->touch = NULL;
      }
  
      if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !input->keyboard) {
          input->keyboard = wl_seat_get_keyboard(seat);
          wl_keyboard_set_user_data(input->keyboard, input);
          wl_keyboard_add_listener(input->keyboard, &keyboard_listener,
                                   input);
      } else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && input->keyboard) {
          wl_keyboard_destroy(input->keyboard);
          input->keyboard = NULL;
      }
  }
  
  static void
  seat_handle_name(void *data, struct wl_seat *wl_seat, const char *name)
  {
      /* unimplemented */
  }
  
  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)
  {
      Wayland_data_source_destroy(data);
  }
  
  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
  };
  
  SDL_WaylandDataSource*
  Wayland_data_source_create(_THIS)
  {
      SDL_WaylandDataSource *data_source = NULL;
      SDL_VideoData *driver_data = NULL;
      struct wl_data_source *id = NULL;
  
      if (_this == NULL || _this->driverdata == NULL) {
          SDL_SetError("Video driver uninitialized");
      } else {
          driver_data = _this->driverdata;
  
          if (driver_data->data_device_manager != NULL) {
              id = wl_data_device_manager_create_data_source(
                       driver_data->data_device_manager);
          }
  
          if (id == NULL) {
              SDL_SetError("Wayland unable to create data source");
          } else {
              data_source = SDL_calloc(1, sizeof *data_source);
              if (data_source == NULL) {
                  SDL_OutOfMemory();
                  wl_data_source_destroy(id);
              } else {
                  WAYLAND_wl_list_init(&(data_source->mimes));
                  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;
  }
  
  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);
  }
  
  static void
  data_offer_handle_source_actions(void *data, struct wl_data_offer *wl_data_offer,
                                   uint32_t source_actions)
  {
  }
  
  static void
  data_offer_handle_actions(void *data, struct wl_data_offer *wl_data_offer,
                            uint32_t 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
  data_device_handle_data_offer(void *data, struct wl_data_device *wl_data_device,
                                struct wl_data_offer *id)
  {
      SDL_WaylandDataOffer *data_offer = NULL;
  
      data_offer = SDL_calloc(1, sizeof *data_offer);
      if (data_offer == NULL) {
          SDL_OutOfMemory();
      } else {
          data_offer->offer = id;
          data_offer->data_device = data;
          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);
      }
  }
  
  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;
      SDL_bool has_mime = SDL_FALSE;
      uint32_t dnd_action = WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE;
  
      data_device->drag_serial = serial;
  
      if (id != NULL) {
          data_device->drag_offer = wl_data_offer_get_user_data(id);
  
          /* TODO: SDL Support more mime types */
          has_mime = Wayland_data_offer_has_mime(
              data_device->drag_offer, FILE_MIME);
  
          /* If drag_mime is NULL this will decline the offer */
          wl_data_offer_accept(id, serial,
                               (has_mime == SDL_TRUE) ? FILE_MIME : NULL);
  
          /* SDL only supports "copy" style drag and drop */
          if (has_mime == SDL_TRUE) {
              dnd_action = WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
          }
          if (wl_data_offer_get_version(data_device->drag_offer->offer) >= 3) {
              wl_data_offer_set_actions(data_device->drag_offer->offer,
                                        dnd_action, dnd_action);
          }
      }
  }
  
  static void
  data_device_handle_leave(void *data, struct wl_data_device *wl_data_device)
  {
      SDL_WaylandDataDevice *data_device = data;
      SDL_WaylandDataOffer *offer = NULL;
  
      if (data_device->selection_offer != NULL) {
          data_device->selection_offer = NULL;
          Wayland_data_offer_destroy(offer);
      }
  }
  
  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)
  {
  }
  
  static void
  data_device_handle_drop(void *data, struct wl_data_device *wl_data_device)
  {
      SDL_WaylandDataDevice *data_device = data;
      void *buffer = NULL;
      size_t length = 0;
  
      const char *current_uri = NULL;
      const char *last_char = NULL;
      char *current_char = NULL;
  
      if (data_device->drag_offer != NULL) {
          /* TODO: SDL Support more mime types */
          buffer = Wayland_data_offer_receive(data_device->drag_offer,
                                              &length, FILE_MIME, SDL_FALSE);
  
          /* uri-list */
          current_uri = (const char *)buffer;
          last_char = (const char *)buffer + length;
          for (current_char = buffer; current_char < last_char; ++current_char) {
              if (*current_char == '\n' || *current_char == 0) {
                  if (*current_uri != 0 && *current_uri != '#') {
                      *current_char = 0;
                      SDL_SendDropFile(NULL, current_uri);
                  }
                  current_uri = (const char *)current_char + 1;
              }
          }
  
          SDL_free(buffer);
      }
  }
  
  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 != NULL) {
          offer = wl_data_offer_get_user_data(id);
      }
  
      if (data_device->selection_offer != offer) {
          Wayland_data_offer_destroy(data_device->selection_offer);
          data_device->selection_offer = offer;
      }
  
      SDL_SendClipboardUpdate();
  }
  
  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
  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)
  {
      char buf[SDL_TEXTEDITINGEVENT_TEXT_SIZE];
      if (text) {
          size_t text_bytes = SDL_strlen(text), i = 0;
          size_t cursor = 0;
  
          do {
              const size_t sz = SDL_utf8strlcpy(buf, text+i, sizeof(buf));
              const size_t chars = SDL_utf8strlen(buf);
  
              SDL_SendEditingText(buf, cursor, chars);
  
              i += sz;
              cursor += chars;
          } while (i < text_bytes);
      } else {
          buf[0] = '\0';
          SDL_SendEditingText(buf, 0, 0);
      }
  }
  
  static void
  text_input_commit_string(void *data,
                           struct zwp_text_input_v3 *zwp_text_input_v3,
                           const char *text)
  {
      if (text && *text) {
          char buf[SDL_TEXTINPUTEVENT_TEXT_SIZE];
          size_t text_bytes = SDL_strlen(text), i = 0;
  
          while (i < text_bytes) {
              size_t sz = SDL_utf8strlcpy(buf, text+i, sizeof(buf));
              SDL_SendKeyboardText(buf);
  
              i += sz;
          }
      }
  }
  
  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)
  {
      /* No-op */
  }
  
  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_create_data_device(SDL_VideoData *d)
  {
      SDL_WaylandDataDevice *data_device = NULL;
  
      data_device = SDL_calloc(1, sizeof *data_device);
      if (data_device == NULL) {
          return;
      }
  
      data_device->data_device = wl_data_device_manager_get_data_device(
          d->data_device_manager, d->input->seat
      );
      data_device->video_data = d;
  
      if (data_device->data_device == NULL) {
          SDL_free(data_device);
      } else {
          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);
          d->input->data_device = data_device;
      }
  }
  
  static void
  Wayland_create_text_input(SDL_VideoData *d)
  {
      SDL_WaylandTextInput *text_input = NULL;
  
      text_input = SDL_calloc(1, sizeof *text_input);
      if (text_input == NULL) {
          return;
      }
  
      text_input->text_input = zwp_text_input_manager_v3_get_text_input(
          d->text_input_manager, d->input->seat
      );
  
      if (text_input->text_input == NULL) {
          SDL_free(text_input);
      } else {
          zwp_text_input_v3_set_user_data(text_input->text_input, text_input);
          zwp_text_input_v3_add_listener(text_input->text_input,
                                         &text_input_listener, text_input);
          d->input->text_input = text_input;
      }
  }
  
  void
  Wayland_add_data_device_manager(SDL_VideoData *d, uint32_t id, uint32_t version)
  {
      d->data_device_manager = wl_registry_bind(d->registry, id, &wl_data_device_manager_interface, SDL_min(3, version));
  
      if (d->input != NULL) {
          Wayland_create_data_device(d);
      }
  }
  
  void
  Wayland_add_text_input_manager(SDL_VideoData *d, uint32_t id, uint32_t version)
  {
      d->text_input_manager = wl_registry_bind(d->registry, id, &zwp_text_input_manager_v3_interface, 1);
  
      if (d->input != NULL) {
          Wayland_create_text_input(d);
      }
  }
  
  void
  Wayland_display_add_input(SDL_VideoData *d, uint32_t id, uint32_t version)
  {
      struct SDL_WaylandInput *input;
  
      input = SDL_calloc(1, sizeof *input);
      if (input == NULL)
          return;
  
      input->display = d;
      input->seat = wl_registry_bind(d->registry, id, &wl_seat_interface, SDL_min(5, version));
      input->sx_w = wl_fixed_from_int(0);
      input->sy_w = wl_fixed_from_int(0);
      d->input = input;
  
      if (d->data_device_manager != NULL) {
          Wayland_create_data_device(d);
      }
      if (d->text_input_manager != NULL) {
          Wayland_create_text_input(d);
      }
  
      wl_seat_add_listener(input->seat, &seat_listener, input);
      wl_seat_set_user_data(input->seat, input);
  
      WAYLAND_wl_display_flush(d->display);
  }
  
  void Wayland_display_destroy_input(SDL_VideoData *d)
  {
      struct SDL_WaylandInput *input = d->input;
  
      if (!input)
          return;
  
      if (input->data_device != NULL) {
          Wayland_data_device_clear_selection(input->data_device);
          if (input->data_device->selection_offer != NULL) {
              Wayland_data_offer_destroy(input->data_device->selection_offer);
          }
          if (input->data_device->drag_offer != NULL) {
              Wayland_data_offer_destroy(input->data_device->drag_offer);
          }
          if (input->data_device->data_device != NULL) {
              wl_data_device_release(input->data_device->data_device);
          }
          SDL_free(input->data_device);
      }
  
      if (input->text_input != NULL) {
          zwp_text_input_v3_destroy(input->text_input->text_input);
          SDL_free(input->text_input);
      }
  
      if (input->keyboard)
          wl_keyboard_destroy(input->keyboard);
  
      if (input->pointer)
          wl_pointer_destroy(input->pointer);
  
      if (input->touch) {
          SDL_DelTouch(1);
          wl_touch_destroy(input->touch);
      }
  
      if (input->seat)
          wl_seat_destroy(input->seat);
  
      if (input->xkb.compose_state)
          WAYLAND_xkb_compose_state_unref(input->xkb.compose_state);
  
      if (input->xkb.compose_table)
          WAYLAND_xkb_compose_table_unref(input->xkb.compose_table);
  
      if (input->xkb.state)
          WAYLAND_xkb_state_unref(input->xkb.state);
  
      if (input->xkb.keymap)
          WAYLAND_xkb_keymap_unref(input->xkb.keymap);
  
      SDL_free(input);
      d->input = NULL;
  }
  
  /* !!! FIXME: just merge these into display_handle_global(). */
  void Wayland_display_add_relative_pointer_manager(SDL_VideoData *d, uint32_t id)
  {
      d->relative_pointer_manager =
          wl_registry_bind(d->registry, id,
                           &zwp_relative_pointer_manager_v1_interface, 1);
  }
  
  void Wayland_display_destroy_relative_pointer_manager(SDL_VideoData *d)
  {
      if (d->relative_pointer_manager)
          zwp_relative_pointer_manager_v1_destroy(d->relative_pointer_manager);
  }
  
  void Wayland_display_add_pointer_constraints(SDL_VideoData *d, uint32_t id)
  {
      d->pointer_constraints =
          wl_registry_bind(d->registry, id,
                           &zwp_pointer_constraints_v1_interface, 1);
  }
  
  void Wayland_display_destroy_pointer_constraints(SDL_VideoData *d)
  {
      if (d->pointer_constraints)
          zwp_pointer_constraints_v1_destroy(d->pointer_constraints);
  }
  
  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_w,
                                          wl_fixed_t dy_w,
                                          wl_fixed_t dx_unaccel_w,
                                          wl_fixed_t dy_unaccel_w)
  {
      struct SDL_WaylandInput *input = data;
      SDL_VideoData *d = input->display;
      SDL_WindowData *window = input->pointer_focus;
      double dx_unaccel;
      double dy_unaccel;
      double dx;
      double dy;
  
      dx_unaccel = wl_fixed_to_double(dx_unaccel_w);
      dy_unaccel = wl_fixed_to_double(dy_unaccel_w);
  
      /* Add left over fraction from last event. */
      dx_unaccel += input->dx_frac;
      dy_unaccel += input->dy_frac;
  
      input->dx_frac = modf(dx_unaccel, &dx);
      input->dy_frac = modf(dy_unaccel, &dy);
  
      if (input->pointer_focus && d->relative_mouse_mode) {
          SDL_SendMouseMotion(window->sdlwindow, 0, 1, (int)dx, (int)dy);
      }
  }
  
  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)
  {
  }
  
  static void
  locked_pointer_unlocked(void *data,
                          struct zwp_locked_pointer_v1 *locked_pointer)
  {
  }
  
  static const struct zwp_locked_pointer_v1_listener locked_pointer_listener = {
      locked_pointer_locked,
      locked_pointer_unlocked,
  };
  
  static void
  lock_pointer_to_window(SDL_Window *window,
                         struct SDL_WaylandInput *input)
  {
      SDL_WindowData *w = window->driverdata;
      SDL_VideoData *d = input->display;
      struct zwp_locked_pointer_v1 *locked_pointer;
  
      if (w->locked_pointer)
          return;
  
      locked_pointer =
          zwp_pointer_constraints_v1_lock_pointer(d->pointer_constraints,
                                                  w->surface,
                                                  input->pointer,
                                                  NULL,
                                                  ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
      zwp_locked_pointer_v1_add_listener(locked_pointer,
                                         &locked_pointer_listener,
                                         window);
  
      w->locked_pointer = locked_pointer;
  }
  
  static void pointer_confine_destroy(SDL_Window *window)
  {
      SDL_WindowData *w = window->driverdata;
      if (w->confined_pointer) {
          zwp_confined_pointer_v1_destroy(w->confined_pointer);
          w->confined_pointer = NULL;
      }
  }
  
  int Wayland_input_lock_pointer(struct SDL_WaylandInput *input)
  {
      SDL_VideoDevice *vd = SDL_GetVideoDevice();
      SDL_VideoData *d = input->display;
      SDL_Window *window;
      struct zwp_relative_pointer_v1 *relative_pointer;
  
      if (!d->relative_pointer_manager)
          return -1;
  
      if (!d->pointer_constraints)
          return -1;
  
      if (!input->pointer)
          return -1;
  
      /* If we have a pointer confine active, we must destroy it here because
       * creating a locked pointer otherwise would be a protocol error. */
      for (window = vd->windows; window; window = window->next)
          pointer_confine_destroy(window);
  
      if (!input->relative_pointer) {
          relative_pointer =
              zwp_relative_pointer_manager_v1_get_relative_pointer(
                  d->relative_pointer_manager,
                  input->pointer);
          zwp_relative_pointer_v1_add_listener(relative_pointer,
                                               &relative_pointer_listener,
                                               input);
          input->relative_pointer = relative_pointer;
      }
  
      for (window = vd->windows; window; window = window->next)
          lock_pointer_to_window(window, input);
  
      d->relative_mouse_mode = 1;
  
      return 0;
  }
  
  int Wayland_input_unlock_pointer(struct SDL_WaylandInput *input)
  {
      SDL_VideoDevice *vd = SDL_GetVideoDevice();
      SDL_VideoData *d = input->display;
      SDL_Window *window;
      SDL_WindowData *w;
  
      for (window = vd->windows; window; window = window->next) {
          w = window->driverdata;
          if (w->locked_pointer)
              zwp_locked_pointer_v1_destroy(w->locked_pointer);
          w->locked_pointer = NULL;
      }
  
      zwp_relative_pointer_v1_destroy(input->relative_pointer);
      input->relative_pointer = NULL;
  
      d->relative_mouse_mode = 0;
  
      for (window = vd->windows; window; window = window->next)
          Wayland_input_confine_pointer(input, window);
  
      return 0;
  }
  
  static void
  confined_pointer_confined(void *data,
                            struct zwp_confined_pointer_v1 *confined_pointer)
  {
  }
  
  static void
  confined_pointer_unconfined(void *data,
                              struct zwp_confined_pointer_v1 *confined_pointer)
  {
  }
  
  static const struct zwp_confined_pointer_v1_listener confined_pointer_listener = {
      confined_pointer_confined,
      confined_pointer_unconfined,
  };
  
  int Wayland_input_confine_pointer(struct SDL_WaylandInput *input, SDL_Window *window)
  {
      SDL_WindowData *w = window->driverdata;
      SDL_VideoData *d = input->display;
      struct zwp_confined_pointer_v1 *confined_pointer;
      struct wl_region *confine_rect;
  
      if (!d->pointer_constraints)
          return -1;
  
      if (!input->pointer)
          return -1;
  
      /* A confine may already be active, in which case we should destroy it and
       * create a new one. */
      pointer_confine_destroy(window);
  
      /* We cannot create a confine if the pointer is already locked. Defer until
       * the pointer is unlocked. */
      if (d->relative_mouse_mode)
          return 0;
  
      if (SDL_RectEmpty(&window->mouse_rect)) {
          confine_rect = NULL;
      } else {
          confine_rect = wl_compositor_create_region(d->compositor);
          wl_region_add(confine_rect,
                        window->mouse_rect.x,
                        window->mouse_rect.y,
                        window->mouse_rect.w,
                        window->mouse_rect.h);
      }
  
      confined_pointer =
          zwp_pointer_constraints_v1_confine_pointer(d->pointer_constraints,
                                                     w->surface,
                                                     input->pointer,
                                                     confine_rect,
                                                     ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
      zwp_confined_pointer_v1_add_listener(confined_pointer,
                                           &confined_pointer_listener,
                                           window);
  
      if (confine_rect != NULL) {
          wl_region_destroy(confine_rect);
      }
  
      w->confined_pointer = confined_pointer;
      return 0;
  }
  
  int Wayland_input_unconfine_pointer(struct SDL_WaylandInput *input, SDL_Window *window)
  {
      pointer_confine_destroy(window);
      return 0;
  }
  
  int Wayland_input_grab_keyboard(SDL_Window *window, struct SDL_WaylandInput *input)
  {
      SDL_WindowData *w = window->driverdata;
      SDL_VideoData *d = input->display;
  
      if (!d->key_inhibitor_manager)
          return -1;
  
      if (w->key_inhibitor)
          return 0;
  
      w->key_inhibitor =
          zwp_keyboard_shortcuts_inhibit_manager_v1_inhibit_shortcuts(d->key_inhibitor_manager,
                                                                      w->surface,
                                                                      input->seat);
  
      return 0;
  }
  
  int Wayland_input_ungrab_keyboard(SDL_Window *window)
  {
      SDL_WindowData *w = window->driverdata;
  
      if (w->key_inhibitor) {
          zwp_keyboard_shortcuts_inhibitor_v1_destroy(w->key_inhibitor);
          w->key_inhibitor = NULL;
      }
  
      return 0;
  }
  
  #endif /* SDL_VIDEO_DRIVER_WAYLAND */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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