diff --git a/internal/atlas/image.go b/internal/atlas/image.go
index 67c378a83..e67a05b3f 100644
--- a/internal/atlas/image.go
+++ b/internal/atlas/image.go
@@ -126,6 +126,8 @@ var (
 	imagesToPutOnSourceBackend smallImageSet
 
 	imagesUsedAsDestination smallImageSet
+
+	graphicsDriverInitialized bool
 )
 
 type ImageType int
@@ -627,6 +629,10 @@ func (i *Image) canBePutOnAtlas() bool {
 }
 
 func (i *Image) allocate(forbiddenBackends []*backend, asSource bool) {
+	if !graphicsDriverInitialized {
+		panic("atlas: graphics driver must be ready at allocate but not")
+	}
+
 	if i.backend != nil {
 		panic("atlas: the image is already allocated")
 	}
@@ -806,7 +812,7 @@ func BeginFrame(graphicsDriver graphicsdriver.Graphics) error {
 
 	var err error
 	initOnce.Do(func() {
-		err = restorable.InitializeGraphicsDriverState(graphicsDriver)
+		err = graphicscommand.InitializeGraphicsDriverState(graphicsDriver)
 		if err != nil {
 			return
 		}
@@ -822,8 +828,10 @@ func BeginFrame(graphicsDriver graphicsdriver.Graphics) error {
 			minDestinationSize = 16
 		}
 		if maxSize == 0 {
-			maxSize = floorPowerOf2(restorable.MaxImageSize(graphicsDriver))
+			maxSize = floorPowerOf2(graphicscommand.MaxImageSize(graphicsDriver))
 		}
+
+		graphicsDriverInitialized = true
 	})
 	if err != nil {
 		return err
diff --git a/internal/restorable/image.go b/internal/restorable/image.go
index 04fee8acb..16592120e 100644
--- a/internal/restorable/image.go
+++ b/internal/restorable/image.go
@@ -52,10 +52,6 @@ type Image struct {
 //
 // Note that Dispose is not called automatically.
 func NewImage(width, height int, imageType ImageType) *Image {
-	if !graphicsDriverInitialized {
-		panic("restorable: graphics driver must be ready at NewImage but not")
-	}
-
 	i := &Image{
 		Image:     graphicscommand.NewImage(width, height, imageType == ImageTypeScreen),
 		width:     width,
diff --git a/internal/restorable/images.go b/internal/restorable/images.go
deleted file mode 100644
index 03bac0eaa..000000000
--- a/internal/restorable/images.go
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright 2017 The Ebiten Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package restorable
-
-import (
-	"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
-	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
-)
-
-var graphicsDriverInitialized bool
-
-// InitializeGraphicsDriverState initializes the graphics driver state.
-func InitializeGraphicsDriverState(graphicsDriver graphicsdriver.Graphics) error {
-	graphicsDriverInitialized = true
-	return graphicscommand.InitializeGraphicsDriverState(graphicsDriver)
-}
-
-// MaxImageSize returns the maximum size of an image.
-func MaxImageSize(graphicsDriver graphicsdriver.Graphics) int {
-	return graphicscommand.MaxImageSize(graphicsDriver)
-}