Add package internal/opengl

internal/graphics/gl.go

@@ -24,11 +24,3 @@ const (
 	FilterNearest Filter = gl.NEAREST
 	FilterLinear         = gl.LINEAR
 )
-
-func Init() {
-	gl.Init()
-	gl.Enable(gl.TEXTURE_2D)
-	// Textures' pixel formats are alpha premultiplied.
-	gl.Enable(gl.BLEND)
-	gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
-}

internal/opengl/context.go

@@ -0,0 +1,36 @@
+// Copyright 2014 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
+
+import (
+	"github.com/go-gl/gl"
+)
+
+type Context struct {
+}
+
+func NewContext() *Context {
+	c := &Context{}
+	c.init()
+	return c
+}
+
+func (c *Context) init() {
+	gl.Init()
+	gl.Enable(gl.TEXTURE_2D)
+	// Textures' pixel formats are alpha premultiplied.
+	gl.Enable(gl.BLEND)
+	gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
+}

ui.go

@@ -18,6 +18,7 @@ import (
 	"fmt"
 	glfw "github.com/go-gl/glfw3"
 	"github.com/hajimehoshi/ebiten/internal/graphics"
+	"github.com/hajimehoshi/ebiten/internal/opengl"
 	"image"
 	"runtime"
 )
@@ -47,7 +48,7 @@ func init() {
 	}
 	currentUI.run()
 	currentUI.use(func() {
-		graphics.Init()
+		currentUI.glContext = opengl.NewContext()
 		glfw.SwapInterval(1)
 	})
 }
@@ -55,6 +56,7 @@ func init() {
 type ui struct {
 	window          *glfw.Window
 	scale           int
+	glContext       *opengl.Context
 	graphicsContext *graphicsContext
 	input           input
 	funcs           chan func()