clients: Add an optional roundtrip for visual lookup

clients/simple-client.c

@@ -188,12 +188,31 @@ init_gl(struct window *window)
 		glGetUniformLocation(window->gl.program, "rotation");
 }
 
+static void
+sync_callback(void *data)
+{
+	int *done = data;
+
+	*done = 1;
+}
+
 static void
 create_surface(struct window *window)
 {
 	struct display *display = window->display;
 	struct wl_visual *visual;
 	EGLBoolean ret;
+	int done = 0;
+	
+	if (!display->premultiplied_argb_visual) {
+		wl_display_sync_callback(display->display, sync_callback, &done);
+		while (!done)
+			wl_display_iterate(display->display, display->mask);
+		if (!display->premultiplied_argb_visual) {
+			fprintf(stderr, "premultiplied argb visual missing\n");
+			exit(1);
+		}
+	}
 
 	window->surface = wl_compositor_create_surface(display->compositor);
 	visual = display->premultiplied_argb_visual;
@@ -333,6 +352,8 @@ main(int argc, char **argv)
 	wl_display_add_global_listener(display.display,
 				       display_handle_global, &display);
 
+	wl_display_get_fd(display.display, event_mask_update, &display);
+
 	init_egl(&display);
 	create_surface(&window);
 	init_gl(&window);
@@ -340,7 +361,6 @@ main(int argc, char **argv)
 	wl_display_frame_callback(display.display, window.surface,
 				  redraw, &window);
 
-	wl_display_get_fd(display.display, event_mask_update, &display);
 	while (true)
 		wl_display_iterate(display.display, display.mask);
 

clients/window.c

@@ -1849,6 +1849,25 @@ init_egl(struct display *d)
 	return 0;
 }
 
+static void
+sync_callback(void *data)
+{
+	int *done = data;
+
+	*done = 1;
+}
+
+static void
+force_roundtrip(struct display *d)
+{
+	int done = 0;
+
+	wl_display_sync_callback(d->display, sync_callback, &done);
+	wl_display_iterate(d->display, WL_DISPLAY_WRITABLE);
+	while (!done)
+		wl_display_iterate(d->display, WL_DISPLAY_READABLE);
+}
+
 struct display *
 display_create(int *argc, char **argv[], const GOptionEntry *option_entries,
 	       display_global_handler_t handler)
@@ -1900,7 +1919,6 @@ display_create(int *argc, char **argv[], const GOptionEntry *option_entries,
 
 	/* Process connection events. */
 	wl_display_iterate(d->display, WL_DISPLAY_READABLE);
-
 	if (init_egl(d) < 0)
 		return NULL;
 
@@ -1909,6 +1927,14 @@ display_create(int *argc, char **argv[], const GOptionEntry *option_entries,
 	d->create_image = (void *) eglGetProcAddress("eglCreateImageKHR");
 	d->destroy_image = (void *) eglGetProcAddress("eglDestroyImageKHR");
 
+	if (!d->premultiplied_argb_visual || !d->rgb_visual) {
+		force_roundtrip(d);
+		if (!d->premultiplied_argb_visual || !d->rgb_visual) {
+			fprintf(stderr, "failed to retreive visuals\n");
+			return NULL;
+		}
+	}
+
 	create_pointer_surfaces(d);
 
 	display_render_frame(d);