diff --git a/internal/ui/graphics_darwin.go b/internal/ui/graphics_darwin.go
index 123a7f86e..19cc4b81a 100644
--- a/internal/ui/graphics_darwin.go
+++ b/internal/ui/graphics_darwin.go
@@ -34,6 +34,8 @@ package ui
 import "C"
 
 import (
+	"sync"
+
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/mtl"
@@ -56,14 +58,15 @@ func supportsMetal() bool {
 	return true
 }
 
-func init() {
-	if supportsMetal() {
-		graphics = metal.Get()
-		return
-	}
-	graphics = opengl.Get()
-}
+var graphicsOnce sync.Once
 
 func Graphics() graphicsdriver.Graphics {
+	graphicsOnce.Do(func() {
+		if supportsMetal() {
+			graphics = metal.Get()
+			return
+		}
+		graphics = opengl.Get()
+	})
 	return graphics
 }
diff --git a/init.go b/internal/ui/init.go
similarity index 85%
rename from init.go
rename to internal/ui/init.go
index b783bcc48..eb9a367e7 100644
--- a/init.go
+++ b/internal/ui/init.go
@@ -12,13 +12,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package ebiten
+package ui
 
 import (
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
-	"github.com/hajimehoshi/ebiten/v2/internal/ui"
 )
 
 func init() {
-	graphicscommand.SetGraphicsDriver(ui.Graphics())
+	graphicscommand.SetGraphicsDriver(Graphics())
 }