diff --git a/internal/graphics/opengl/context.go b/internal/graphics/opengl/context.go
new file mode 100644
index 000000000..18c297ac5
--- /dev/null
+++ b/internal/graphics/opengl/context.go
@@ -0,0 +1,37 @@
+// Copyright 2016 Hajime Hoshi
+//
+// 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 opengl
+
+type Context struct {
+	Nearest            Filter
+	Linear             Filter
+	VertexShader       ShaderType
+	FragmentShader     ShaderType
+	ArrayBuffer        BufferType
+	ElementArrayBuffer BufferType
+	DynamicDraw        BufferUsage
+	StaticDraw         BufferUsage
+	Triangles          Mode
+	Lines              Mode
+	zero               operation
+	one                operation
+	srcAlpha           operation
+	dstAlpha           operation
+	oneMinusSrcAlpha   operation
+	oneMinusDstAlpha   operation
+	locationCache      *locationCache
+	lastCompositeMode  CompositeMode
+	context
+}
diff --git a/internal/graphics/opengl/types.go b/internal/graphics/opengl/types.go
index 1c8c4d7ce..e60c6d4d0 100644
--- a/internal/graphics/opengl/types.go
+++ b/internal/graphics/opengl/types.go
@@ -21,28 +21,6 @@ type BufferUsage int
 type Mode int
 type operation int
 
-type Context struct {
-	Nearest            Filter
-	Linear             Filter
-	VertexShader       ShaderType
-	FragmentShader     ShaderType
-	ArrayBuffer        BufferType
-	ElementArrayBuffer BufferType
-	DynamicDraw        BufferUsage
-	StaticDraw         BufferUsage
-	Triangles          Mode
-	Lines              Mode
-	zero               operation
-	one                operation
-	srcAlpha           operation
-	dstAlpha           operation
-	oneMinusSrcAlpha   operation
-	oneMinusDstAlpha   operation
-	locationCache      *locationCache
-	lastCompositeMode  CompositeMode
-	context
-}
-
 type CompositeMode int
 
 const (