[KMS/DRM] Restore hacky code to point to TTY buffer on surface destruction b/c I lack alternatives.

src/video/kmsdrm/SDL_kmsdrmmouse.c

@@ -409,7 +409,6 @@ KMSDRM_InitMouse(_THIS)
     SDL_VideoData *viddata = ((SDL_VideoData *)dev->driverdata);
     SDL_DisplayData *dispdata = (SDL_DisplayData *)SDL_GetDisplayDriverData(0);
     SDL_Mouse *mouse = SDL_GetMouse();
-    uint64_t usable_cursor_w, usable_cursor_h;
 
     mouse->CreateCursor = KMSDRM_CreateCursor;
     mouse->ShowCursor = KMSDRM_ShowCursor;
@@ -439,23 +438,20 @@ KMSDRM_InitMouse(_THIS)
             return;
         }
 
-	if (KMSDRM_drmGetCap(viddata->drm_fd, DRM_CAP_CURSOR_WIDTH,  &usable_cursor_w) ||
-	    KMSDRM_drmGetCap(viddata->drm_fd, DRM_CAP_CURSOR_HEIGHT, &usable_cursor_h))
+	if (KMSDRM_drmGetCap(viddata->drm_fd, DRM_CAP_CURSOR_WIDTH,  &dispdata->cursor_w) ||
+	    KMSDRM_drmGetCap(viddata->drm_fd, DRM_CAP_CURSOR_HEIGHT, &dispdata->cursor_h))
 	{
 	    SDL_SetError("Could not get the recommended GBM cursor size");
 	    goto cleanup;
 	}
 
-	if (usable_cursor_w == 0 || usable_cursor_h == 0) {
+	if (dispdata->cursor_w == 0 || dispdata->cursor_h == 0) {
 	    SDL_SetError("Could not get an usable GBM cursor size");
 	    goto cleanup;
 	}
 
-        dispdata->cursor_w = usable_cursor_w;
-        dispdata->cursor_h = usable_cursor_h;
-
 	dispdata->cursor_bo = KMSDRM_gbm_bo_create(viddata->gbm_dev,
-	    usable_cursor_w, usable_cursor_h,
+	    dispdata->cursor_w, dispdata->cursor_h,
 	    GBM_FORMAT_ARGB8888, GBM_BO_USE_CURSOR | GBM_BO_USE_WRITE);
 
 	if (!dispdata->cursor_bo) {

src/video/kmsdrm/SDL_kmsdrmvideo.c

@@ -1323,6 +1323,26 @@ void
 KMSDRM_DestroySurfaces(_THIS, SDL_Window *window)
 {
     SDL_WindowData *windata = (SDL_WindowData *) window->driverdata;
+    SDL_DisplayData *dispdata = (SDL_DisplayData *)SDL_GetDisplayDriverData(0);
+    KMSDRM_PlaneInfo plane_info = {0};
+
+    /************************************************************/
+    /* Make the display plane point to the original TTY buffer. */
+    /************************************************************/
+
+    plane_info.plane = dispdata->display_plane;
+    plane_info.crtc_id = dispdata->crtc->crtc->crtc_id;
+    plane_info.fb_id = dispdata->crtc->crtc->buffer_id;
+    plane_info.src_w = dispdata->mode.hdisplay;
+    plane_info.src_h = dispdata->mode.vdisplay;
+    plane_info.crtc_w = dispdata->mode.hdisplay;
+    plane_info.crtc_h = dispdata->mode.vdisplay;
+
+    drm_atomic_set_plane_props(&plane_info);
+
+    if (drm_atomic_commit(_this, SDL_TRUE)) {
+        SDL_SetError("Failed to issue atomic commit on surfaces destruction.");
+    }
 
     /***************************/
     /* Destroy the EGL surface */