wayland: Basic support for zwp_tablet_*v2 protocol

src/video/wayland/SDL_waylandevents_c.h

@@ -29,6 +29,34 @@
 #include "SDL_waylanddatamanager.h"
 #include "SDL_waylandkeyboard.h"
 
+struct SDL_WaylandTabletSeat;
+
+struct SDL_WaylandTabletObjectListNode {
+    void* object;
+    struct SDL_WaylandTabletObjectListNode* next;
+};
+
+struct SDL_WaylandTabletInput {
+    struct SDL_WaylandTabletSeat* seat;
+
+    struct SDL_WaylandTabletObjectListNode* tablets;
+    struct SDL_WaylandTabletObjectListNode* tools;
+    struct SDL_WaylandTabletObjectListNode* pads;
+
+    SDL_WindowData *tool_focus;
+    uint32_t tool_prox_serial;
+
+    /* Last motion location */
+    wl_fixed_t sx_w;
+    wl_fixed_t sy_w;
+
+    SDL_bool is_down;
+
+    SDL_bool btn_stylus;
+    SDL_bool btn_stylus2;
+    SDL_bool btn_stylus3;
+};
+
 typedef struct {
     // repeat_rate in range of [1, 1000]
     int32_t repeat_rate;
@@ -80,6 +108,8 @@ struct SDL_WaylandInput {
     } pointer_curr_axis_info;
 
     SDL_WaylandKeyboardRepeat keyboard_repeat;
+
+    struct SDL_WaylandTabletInput* tablet;
 };
 
 extern void Wayland_PumpEvents(_THIS);
@@ -107,6 +137,9 @@ extern void Wayland_display_destroy_relative_pointer_manager(SDL_VideoData *d);
 extern int Wayland_input_grab_keyboard(SDL_Window *window, struct SDL_WaylandInput *input);
 extern int Wayland_input_ungrab_keyboard(SDL_Window *window);
 
+extern void Wayland_input_add_tablet(struct SDL_WaylandInput *input, struct SDL_WaylandTabletManager* tablet_manager);
+extern void Wayland_input_destroy_tablet(struct SDL_WaylandInput *input);
+
 #endif /* SDL_waylandevents_h_ */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/video/wayland/SDL_waylandvideo.c

@@ -52,6 +52,7 @@
 #include "idle-inhibit-unstable-v1-client-protocol.h"
 #include "xdg-activation-v1-client-protocol.h"
 #include "text-input-unstable-v3-client-protocol.h"
+#include "tablet-unstable-v2-client-protocol.h"
 
 #ifdef HAVE_LIBDECOR_H
 #include <libdecor.h>
@@ -610,6 +611,11 @@ display_handle_global(void *data, struct wl_registry *registry, uint32_t id,
         Wayland_add_data_device_manager(d, id, version);
     } else if (SDL_strcmp(interface, "zxdg_decoration_manager_v1") == 0) {
         d->decoration_manager = wl_registry_bind(d->registry, id, &zxdg_decoration_manager_v1_interface, 1);
+    } else if (SDL_strcmp(interface, "zwp_tablet_manager_v2") == 0) {
+        d->tablet_manager = wl_registry_bind(d->registry, id, &zwp_tablet_manager_v2_interface, 1);
+        if (d->input) {
+            Wayland_input_add_tablet(d->input, d->tablet_manager);
+        }
 
 #ifdef SDL_VIDEO_DRIVER_WAYLAND_QT_TOUCH
     } else if (SDL_strcmp(interface, "qt_touch_extension") == 0) {
@@ -769,6 +775,9 @@ Wayland_VideoQuit(_THIS)
     Wayland_touch_destroy(data);
 #endif /* SDL_VIDEO_DRIVER_WAYLAND_QT_TOUCH */
 
+    if (data->tablet_manager)
+        zwp_tablet_manager_v2_destroy((struct zwp_tablet_manager_v2*)data->tablet_manager);
+
     if (data->data_device_manager)
         wl_data_device_manager_destroy(data->data_device_manager);
 

src/video/wayland/SDL_waylandvideo.h

@@ -34,6 +34,7 @@
 
 struct xkb_context;
 struct SDL_WaylandInput;
+struct SDL_WaylandTabletManager;
 
 #ifdef SDL_VIDEO_DRIVER_WAYLAND_QT_TOUCH
 struct SDL_WaylandTouch;
@@ -77,6 +78,7 @@ typedef struct {
 
     struct xkb_context *xkb_context;
     struct SDL_WaylandInput *input;
+    struct SDL_WaylandTabletManager *tablet_manager;
 
 #ifdef SDL_VIDEO_DRIVER_WAYLAND_QT_TOUCH
     struct SDL_WaylandTouch *touch;