wayland: Don't delay pending surface resize handling on Vulkan.

OpenGL apparently needs to not do any drawing between wl_egl_window_resize
and eglSwapBuffers, but Vulkan apps don't use SDL to present, so they
never call into an equivalent of SDL_GL_SwapWindow where our Wayland code
was handling pending resize work.

Fixes Bugzilla #4722.

src/video/wayland/SDL_waylandopengles.c

@@ -63,41 +63,13 @@ int
 Wayland_GLES_SwapWindow(_THIS, SDL_Window *window)
 {
     SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
-    struct wl_region *region;
 
     if (SDL_EGL_SwapBuffers(_this, data->egl_surface) < 0) {
         return -1;
     }
 
     // Wayland-EGL forbids drawing calls in-between SwapBuffers and wl_egl_window_resize
-    if (data->resize.pending) {
+    Wayland_HandlePendingResize(window);
-        if (data->scale_factor != data->resize.scale_factor) {
-            window->w = 0;
-            window->h = 0;
-        }
-        SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, data->resize.width, data->resize.height);
-        window->w = data->resize.width;
-        window->h = data->resize.height;
-        data->scale_factor = data->resize.scale_factor;
-        wl_surface_set_buffer_scale(data->surface, data->scale_factor);
-        WAYLAND_wl_egl_window_resize(data->egl_window, window->w * data->scale_factor, window->h * data->scale_factor, 0, 0);
-
-        if (data->resize.configure) {
-           if (data->waylandData->shell.xdg) {
-              xdg_surface_ack_configure(data->shell_surface.xdg.surface, data->resize.serial);
-           } else if (data->waylandData->shell.zxdg) {
-              zxdg_surface_v6_ack_configure(data->shell_surface.zxdg.surface, data->resize.serial);
-           }
-           data->resize.configure = SDL_FALSE;
-        }
-
-        region = wl_compositor_create_region(data->waylandData->compositor);
-        wl_region_add(region, 0, 0, window->w, window->h);
-        wl_surface_set_opaque_region(data->surface, region);
-        wl_region_destroy(region);
-
-        data->resize.pending = SDL_FALSE;
-    }
 
     WAYLAND_wl_display_flush( data->waylandData->display );
 

src/video/wayland/SDL_waylandwindow.c

@@ -87,6 +87,10 @@ handle_configure_wl_shell_surface(void *data, struct wl_shell_surface *shell_sur
     wind->resize.width = width;
     wind->resize.height = height;
     wind->resize.pending = SDL_TRUE;
+
+    if (!(window->flags & SDL_WINDOW_OPENGL)) {
+        Wayland_HandlePendingResize(window);  /* OpenGL windows handle this in SwapWindow */
+    }
 }
 
 static void
@@ -134,6 +138,9 @@ handle_configure_zxdg_shell_surface(void *data, struct zxdg_surface_v6 *zxdg, ui
         wind->resize.pending = SDL_TRUE;
         wind->resize.configure = SDL_TRUE;
         wind->resize.serial = serial;
+        if (!(window->flags & SDL_WINDOW_OPENGL)) {
+            Wayland_HandlePendingResize(window);  /* OpenGL windows handle this in SwapWindow */
+        }
     }
 }
 
@@ -241,6 +248,9 @@ handle_configure_xdg_shell_surface(void *data, struct xdg_surface *xdg, uint32_t
         wind->resize.pending = SDL_TRUE;
         wind->resize.configure = SDL_TRUE;
         wind->resize.serial = serial;
+        if (!(window->flags & SDL_WINDOW_OPENGL)) {
+            Wayland_HandlePendingResize(window);  /* OpenGL windows handle this in SwapWindow */
+        }
     }
 }
 
@@ -376,6 +386,9 @@ update_scale_factor(SDL_WindowData *window) {
        window->resize.height = window->sdlwindow->h;
        window->resize.scale_factor = new_factor;
        window->resize.pending = SDL_TRUE;
+       if (!(window->sdlwindow->flags & SDL_WINDOW_OPENGL)) {
+           Wayland_HandlePendingResize(window->sdlwindow);  /* OpenGL windows handle this in SwapWindow */
+       }
    }
 }
 
@@ -782,6 +795,45 @@ int Wayland_CreateWindow(_THIS, SDL_Window *window)
     return 0;
 }
 
+
+void
+Wayland_HandlePendingResize(SDL_Window *window)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+
+    if (data->resize.pending) {
+        struct wl_region *region;
+        if (data->scale_factor != data->resize.scale_factor) {
+            window->w = 0;
+            window->h = 0;
+        }
+        SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, data->resize.width, data->resize.height);
+        window->w = data->resize.width;
+        window->h = data->resize.height;
+        data->scale_factor = data->resize.scale_factor;
+        wl_surface_set_buffer_scale(data->surface, data->scale_factor);
+        if (data->egl_window) {
+            WAYLAND_wl_egl_window_resize(data->egl_window, window->w * data->scale_factor, window->h * data->scale_factor, 0, 0);
+        }
+
+        if (data->resize.configure) {
+           if (data->waylandData->shell.xdg) {
+              xdg_surface_ack_configure(data->shell_surface.xdg.surface, data->resize.serial);
+           } else if (data->waylandData->shell.zxdg) {
+              zxdg_surface_v6_ack_configure(data->shell_surface.zxdg.surface, data->resize.serial);
+           }
+           data->resize.configure = SDL_FALSE;
+        }
+
+        region = wl_compositor_create_region(data->waylandData->compositor);
+        wl_region_add(region, 0, 0, window->w, window->h);
+        wl_surface_set_opaque_region(data->surface, region);
+        wl_region_destroy(region);
+
+        data->resize.pending = SDL_FALSE;
+    }
+}
+
 void Wayland_SetWindowSize(_THIS, SDL_Window * window)
 {
     SDL_VideoData *data = _this->driverdata;

src/video/wayland/SDL_waylandwindow.h

@@ -99,6 +99,8 @@ extern SDL_bool
 Wayland_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info);
 extern int Wayland_SetWindowHitTest(SDL_Window *window, SDL_bool enabled);
 
+extern void Wayland_HandlePendingResize(SDL_Window *window);
+
 #endif /* SDL_waylandwindow_h_ */
 
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