From 00bc1936ebf3f492c3689ea7549ecf50c3350179 Mon Sep 17 00:00:00 2001
From: Ningyuan Li <mariotaku.lee@gmail.com>
Date: Mon, 25 Mar 2024 18:23:08 +0900
Subject: [PATCH] webOS relative mouse hack

---
 src/events/SDL_mouse.c                |  8 ++++++++
 src/events/SDL_mouse_c.h              |  3 +++
 src/video/wayland/SDL_waylandevents.c | 29 +++++++++++++++++++++++++++
 src/video/wayland/SDL_waylandmouse.c  | 11 ++++++++++
 src/video/wayland/SDL_waylandwindow.c |  5 +++++
 src/video/wayland/SDL_waylandwindow.h |  3 ++-
 6 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/src/events/SDL_mouse.c b/src/events/SDL_mouse.c
index 431354f88b39b..846f244fde777 100644
--- a/src/events/SDL_mouse.c
+++ b/src/events/SDL_mouse.c
@@ -231,6 +231,14 @@ void SDL_MousePostInit(void)
             SDL_FreeSurface(surface);
         }
     }
+#if __WEBOS__
+    {
+        SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormat(0, 1, 1, 32, SDL_PIXELFORMAT_RGBA32);
+        SDL_memset(surface->pixels, 0, (size_t)surface->h * surface->pitch);
+        mouse->hidden_cursor = SDL_CreateColorCursor(surface, 0, 0);
+        SDL_FreeSurface(surface);
+    }
+#endif /* __WEBOS__ */
 }
 
 void SDL_SetDefaultCursor(SDL_Cursor *cursor)
diff --git a/src/events/SDL_mouse_c.h b/src/events/SDL_mouse_c.h
index 0ec9650e8fb1f..db655e96d355f 100644
--- a/src/events/SDL_mouse_c.h
+++ b/src/events/SDL_mouse_c.h
@@ -129,6 +129,9 @@ typedef struct
     SDL_Cursor *cursors;
     SDL_Cursor *def_cursor;
     SDL_Cursor *cur_cursor;
+#ifdef __WEBOS__
+    SDL_Cursor *hidden_cursor;
+#endif
     SDL_bool cursor_shown;
 
     /* Driver-dependent data. */
diff --git a/src/video/wayland/SDL_waylandevents.c b/src/video/wayland/SDL_waylandevents.c
index 15e4ed76bdaa7..9f807ac61a8b6 100644
--- a/src/video/wayland/SDL_waylandevents.c
+++ b/src/video/wayland/SDL_waylandevents.c
@@ -417,6 +417,28 @@ static void pointer_handle_motion(void *data, struct wl_pointer *pointer,
 {
     struct SDL_WaylandInput *input = data;
     SDL_WindowData *window = input->pointer_focus;
+#ifdef SDL_VIDEO_DRIVER_WAYLAND_WEBOS
+    static bool warping = false;
+    if (window && window->waylandData->relative_mouse_mode && time != input->pointer_enter_serial) {
+        if (!warping) {
+            SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window->sdlwindow);
+            SDL_WaylandOutputData *output = (SDL_WaylandOutputData *)display->driverdata;
+            int cx = output->width / 2, cy = output->height / 2;
+            warping = true;
+            wl_starfish_pointer_set_cursor_position(window->waylandData->starfish_pointer, cx, cy);
+        } else {
+            const float dx_f = (float)wl_fixed_to_double(input->sx_w) - (float)wl_fixed_to_double(sx_w);
+            const float dy_f = (float)wl_fixed_to_double(input->sy_w) - (float)wl_fixed_to_double(sy_w);
+            const int dx = (int)SDL_floorf(dx_f * window->pointer_scale_x);
+            const int dy = (int)SDL_floorf(dy_f * window->pointer_scale_y);
+            warping = false;
+            SDL_SendMouseMotion(window->sdlwindow, 0, 1, dx, dy);
+        }
+        input->sx_w = sx_w;
+        input->sy_w = sy_w;
+        return;
+    }
+#endif
     input->sx_w = sx_w;
     input->sy_w = sy_w;
     if (input->pointer_focus) {
@@ -2777,6 +2799,13 @@ int Wayland_input_lock_pointer(struct SDL_WaylandInput *input)
     SDL_Window *window;
     struct zwp_relative_pointer_v1 *relative_pointer;
 
+#ifdef SDL_VIDEO_DRIVER_WAYLAND_WEBOS
+    if (d->starfish_pointer) {
+        d->relative_mouse_mode = 1;
+        return 0;
+    }
+#endif
+
     if (!d->relative_pointer_manager) {
         return -1;
     }
diff --git a/src/video/wayland/SDL_waylandmouse.c b/src/video/wayland/SDL_waylandmouse.c
index 284230d1fc03b..7812b84d7af66 100644
--- a/src/video/wayland/SDL_waylandmouse.c
+++ b/src/video/wayland/SDL_waylandmouse.c
@@ -586,7 +586,18 @@ static int Wayland_ShowCursor(SDL_Cursor *cursor)
 
     } else {
         input->cursor_visible = SDL_FALSE;
+#ifdef SDL_VIDEO_DRIVER_WAYLAND_WEBOS
+        {
+            SDL_Cursor *hidden_cur = SDL_GetMouse()->hidden_cursor;
+            Wayland_CursorData *data = hidden_cur->driverdata;
+            wl_pointer_set_cursor(pointer, input->pointer_enter_serial, data->surface, 0, 0);
+            wl_surface_attach(data->surface, data->buffer, 0, 0);
+            wl_surface_damage(data->surface, 0, 0, data->w, data->h);
+            wl_surface_commit(data->surface);
+        }
+#else
         wl_pointer_set_cursor(pointer, input->pointer_enter_serial, NULL, 0, 0);
+#endif
     }
 
     return 0;
diff --git a/src/video/wayland/SDL_waylandwindow.c b/src/video/wayland/SDL_waylandwindow.c
index 4bc62a7fd37eb..05d40f2de5fc5 100644
--- a/src/video/wayland/SDL_waylandwindow.c
+++ b/src/video/wayland/SDL_waylandwindow.c
@@ -2177,6 +2177,11 @@ int Wayland_CreateWindow(_THIS, SDL_Window *window)
     if (c->shell.libdecor && !IS_POPUP(window)) {
         data->shell_surface_type = WAYLAND_SURFACE_LIBDECOR;
     } else
+#endif
+#ifdef SDL_VIDEO_DRIVER_WAYLAND_WEBOS
+    if (c->shell.webos) {
+        data->shell_surface_type = WAYLAND_SURFACE_WEBOS;
+    } else
 #endif
         if (c->shell.xdg) {
         if (IS_POPUP(window)) {
diff --git a/src/video/wayland/SDL_waylandwindow.h b/src/video/wayland/SDL_waylandwindow.h
index 3c96cef556570..c9d69e022a1df 100644
--- a/src/video/wayland/SDL_waylandwindow.h
+++ b/src/video/wayland/SDL_waylandwindow.h
@@ -79,7 +79,8 @@ typedef struct
         WAYLAND_SURFACE_UNKNOWN = 0,
         WAYLAND_SURFACE_XDG_TOPLEVEL,
         WAYLAND_SURFACE_XDG_POPUP,
-        WAYLAND_SURFACE_LIBDECOR
+        WAYLAND_SURFACE_LIBDECOR,
+        WAYLAND_SURFACE_WEBOS,
     } shell_surface_type;
 
     struct wl_egl_window *egl_window;