Refactoring: Add init.go

init.go

@@ -0,0 +1,29 @@
+// Copyright 2020 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 ebiten
+
+import (
+	"github.com/hajimehoshi/ebiten/internal/graphicscommand"
+	"github.com/hajimehoshi/ebiten/internal/mipmap"
+	"github.com/hajimehoshi/ebiten/internal/shareable"
+)
+
+var _ = __EBITEN_REQUIRES_GO_VERSION_1_12_OR_LATER__
+
+func init() {
+	mipmap.SetGraphicsDriver(uiDriver().Graphics())
+	shareable.SetGraphicsDriver(uiDriver().Graphics())
+	graphicscommand.SetGraphicsDriver(uiDriver().Graphics())
+}

run.go

@@ -21,8 +21,6 @@ import (
 	"github.com/hajimehoshi/ebiten/internal/driver"
 )
 
-var _ = __EBITEN_REQUIRES_GO_VERSION_1_12_OR_LATER__
-
 // Game defines necessary functions for a game.
 type Game interface {
 	// Update updates a game by one frame.

uicontext.go

@@ -23,18 +23,9 @@ import (
 	"github.com/hajimehoshi/ebiten/internal/buffered"
 	"github.com/hajimehoshi/ebiten/internal/clock"
 	"github.com/hajimehoshi/ebiten/internal/driver"
-	"github.com/hajimehoshi/ebiten/internal/graphicscommand"
 	"github.com/hajimehoshi/ebiten/internal/hooks"
-	"github.com/hajimehoshi/ebiten/internal/mipmap"
-	"github.com/hajimehoshi/ebiten/internal/shareable"
 )
 
-func init() {
-	mipmap.SetGraphicsDriver(uiDriver().Graphics())
-	shareable.SetGraphicsDriver(uiDriver().Graphics())
-	graphicscommand.SetGraphicsDriver(uiDriver().Graphics())
-}
-
 type defaultGame struct {
 	update  func(screen *Image) error
 	width   int