diff --git a/graphics.go b/graphics.go
index 814cfa2f4..1cb5ceeed 100644
--- a/graphics.go
+++ b/graphics.go
@@ -16,7 +16,6 @@ package ebiten
 
 import (
 	"github.com/hajimehoshi/ebiten/internal/graphics"
-	"github.com/hajimehoshi/ebiten/internal/opengl"
 )
 
 // Filter represents the type of texture filter to be used when an image is maginified or minified.
@@ -46,42 +45,42 @@ type CompositeMode int
 const (
 	// Regular alpha blending
 	// c_out = c_src + c_dst × (1 - α_src)
-	CompositeModeSourceOver CompositeMode = CompositeMode(opengl.CompositeModeSourceOver)
+	CompositeModeSourceOver CompositeMode = CompositeMode(graphics.CompositeModeSourceOver)
 
 	// c_out = 0
-	CompositeModeClear CompositeMode = CompositeMode(opengl.CompositeModeClear)
+	CompositeModeClear CompositeMode = CompositeMode(graphics.CompositeModeClear)
 
 	// c_out = c_src
-	CompositeModeCopy CompositeMode = CompositeMode(opengl.CompositeModeCopy)
+	CompositeModeCopy CompositeMode = CompositeMode(graphics.CompositeModeCopy)
 
 	// c_out = c_dst
-	CompositeModeDestination CompositeMode = CompositeMode(opengl.CompositeModeDestination)
+	CompositeModeDestination CompositeMode = CompositeMode(graphics.CompositeModeDestination)
 
 	// c_out = c_src × (1 - α_dst) + c_dst
-	CompositeModeDestinationOver CompositeMode = CompositeMode(opengl.CompositeModeDestinationOver)
+	CompositeModeDestinationOver CompositeMode = CompositeMode(graphics.CompositeModeDestinationOver)
 
 	// c_out = c_src × α_dst
-	CompositeModeSourceIn CompositeMode = CompositeMode(opengl.CompositeModeSourceIn)
+	CompositeModeSourceIn CompositeMode = CompositeMode(graphics.CompositeModeSourceIn)
 
 	// c_out = c_dst × α_src
-	CompositeModeDestinationIn CompositeMode = CompositeMode(opengl.CompositeModeDestinationIn)
+	CompositeModeDestinationIn CompositeMode = CompositeMode(graphics.CompositeModeDestinationIn)
 
 	// c_out = c_src × (1 - α_dst)
-	CompositeModeSourceOut CompositeMode = CompositeMode(opengl.CompositeModeSourceOut)
+	CompositeModeSourceOut CompositeMode = CompositeMode(graphics.CompositeModeSourceOut)
 
 	// c_out = c_dst × (1 - α_src)
-	CompositeModeDestinationOut CompositeMode = CompositeMode(opengl.CompositeModeDestinationOut)
+	CompositeModeDestinationOut CompositeMode = CompositeMode(graphics.CompositeModeDestinationOut)
 
 	// c_out = c_src × α_dst + c_dst × (1 - α_src)
-	CompositeModeSourceAtop CompositeMode = CompositeMode(opengl.CompositeModeSourceAtop)
+	CompositeModeSourceAtop CompositeMode = CompositeMode(graphics.CompositeModeSourceAtop)
 
 	// c_out = c_src × (1 - α_dst) + c_dst × α_src
-	CompositeModeDestinationAtop CompositeMode = CompositeMode(opengl.CompositeModeDestinationAtop)
+	CompositeModeDestinationAtop CompositeMode = CompositeMode(graphics.CompositeModeDestinationAtop)
 
 	// c_out = c_src × (1 - α_dst) + c_dst × (1 - α_src)
-	CompositeModeXor CompositeMode = CompositeMode(opengl.CompositeModeXor)
+	CompositeModeXor CompositeMode = CompositeMode(graphics.CompositeModeXor)
 
 	// Sum of source and destination (a.k.a. 'plus' or 'additive')
 	// c_out = c_src + c_dst
-	CompositeModeLighter CompositeMode = CompositeMode(opengl.CompositeModeLighter)
+	CompositeModeLighter CompositeMode = CompositeMode(graphics.CompositeModeLighter)
 )
diff --git a/image.go b/image.go
index b70e20fec..8e8b4c877 100644
--- a/image.go
+++ b/image.go
@@ -22,7 +22,6 @@ import (
 
 	"github.com/hajimehoshi/ebiten/internal/graphics"
 	"github.com/hajimehoshi/ebiten/internal/graphicsutil"
-	"github.com/hajimehoshi/ebiten/internal/opengl"
 	"github.com/hajimehoshi/ebiten/internal/shareable"
 )
 
@@ -92,7 +91,7 @@ func (m *mipmap) level(r image.Rectangle, level int) *shareable.Image {
 			vs = src.QuadVertices(0, 0, w, h, 0.5, 0, 0, 0.5, 0, 0, 1, 1, 1, 1)
 		}
 		is := graphicsutil.QuadIndices()
-		s.DrawImage(src, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterLinear)
+		s.DrawImage(src, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterLinear)
 		imgs = append(imgs, s)
 		w = w2
 		h = h2
@@ -374,7 +373,7 @@ func (i *Image) drawImage(img *Image, options *DrawImageOptions) {
 		geom.Concat(options.GeoM)
 	}
 
-	mode := opengl.CompositeMode(options.CompositeMode)
+	mode := graphics.CompositeMode(options.CompositeMode)
 
 	filter := graphics.FilterNearest
 	if options.Filter != FilterDefault {
@@ -509,7 +508,7 @@ func (i *Image) DrawTriangles(vertices []Vertex, indices []uint16, img *Image, o
 		options = &DrawTrianglesOptions{}
 	}
 
-	mode := opengl.CompositeMode(options.CompositeMode)
+	mode := graphics.CompositeMode(options.CompositeMode)
 
 	filter := graphics.FilterNearest
 	if options.Filter != FilterDefault {
diff --git a/internal/graphics/compositemode.go b/internal/graphics/compositemode.go
new file mode 100644
index 000000000..728ee8b61
--- /dev/null
+++ b/internal/graphics/compositemode.go
@@ -0,0 +1,78 @@
+// Copyright 2018 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 graphics
+
+type CompositeMode int
+
+const (
+	CompositeModeSourceOver CompositeMode = iota // This value must be 0 (= initial value)
+	CompositeModeClear
+	CompositeModeCopy
+	CompositeModeDestination
+	CompositeModeDestinationOver
+	CompositeModeSourceIn
+	CompositeModeDestinationIn
+	CompositeModeSourceOut
+	CompositeModeDestinationOut
+	CompositeModeSourceAtop
+	CompositeModeDestinationAtop
+	CompositeModeXor
+	CompositeModeLighter
+	CompositeModeUnknown
+)
+
+type Operation int
+
+const (
+	Zero Operation = iota
+	One
+	SrcAlpha
+	DstAlpha
+	OneMinusSrcAlpha
+	OneMinusDstAlpha
+)
+
+func (c CompositeMode) Operations() (src Operation, dst Operation) {
+	switch c {
+	case CompositeModeSourceOver:
+		return One, OneMinusSrcAlpha
+	case CompositeModeClear:
+		return Zero, Zero
+	case CompositeModeCopy:
+		return One, Zero
+	case CompositeModeDestination:
+		return Zero, One
+	case CompositeModeDestinationOver:
+		return OneMinusDstAlpha, One
+	case CompositeModeSourceIn:
+		return DstAlpha, Zero
+	case CompositeModeDestinationIn:
+		return Zero, SrcAlpha
+	case CompositeModeSourceOut:
+		return OneMinusDstAlpha, Zero
+	case CompositeModeDestinationOut:
+		return Zero, OneMinusSrcAlpha
+	case CompositeModeSourceAtop:
+		return DstAlpha, OneMinusSrcAlpha
+	case CompositeModeDestinationAtop:
+		return OneMinusDstAlpha, SrcAlpha
+	case CompositeModeXor:
+		return OneMinusDstAlpha, OneMinusSrcAlpha
+	case CompositeModeLighter:
+		return One, One
+	default:
+		panic("not reached")
+	}
+}
diff --git a/internal/graphicscommand/command.go b/internal/graphicscommand/command.go
index 035f155f2..f07b2278e 100644
--- a/internal/graphicscommand/command.go
+++ b/internal/graphicscommand/command.go
@@ -37,7 +37,7 @@ type command interface {
 	NumIndices() int
 	AddNumVertices(n int)
 	AddNumIndices(n int)
-	CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) bool
+	CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool
 }
 
 // commandQueue is a command queue for drawing commands.
@@ -89,7 +89,7 @@ func (q *commandQueue) appendIndices(indices []uint16, offset uint16) {
 	q.nindices += len(indices)
 }
 
-func (q *commandQueue) doEnqueueDrawImageCommand(dst, src *Image, nvertices, nindices int, color *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter, forceNewCommand bool) {
+func (q *commandQueue) doEnqueueDrawImageCommand(dst, src *Image, nvertices, nindices int, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter, forceNewCommand bool) {
 	if nindices > indicesNum {
 		panic("not implemented for too many indices")
 	}
@@ -113,7 +113,7 @@ func (q *commandQueue) doEnqueueDrawImageCommand(dst, src *Image, nvertices, nin
 }
 
 // EnqueueDrawImageCommand enqueues a drawing-image command.
-func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, indices []uint16, color *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) {
+func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, indices []uint16, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) {
 	if len(indices) > indicesNum {
 		panic("not reached")
 	}
@@ -221,7 +221,7 @@ type drawImageCommand struct {
 	nvertices int
 	nindices  int
 	color     *affine.ColorM
-	mode      opengl.CompositeMode
+	mode      graphics.CompositeMode
 	filter    graphics.Filter
 }
 
@@ -276,7 +276,7 @@ func (c *drawImageCommand) AddNumIndices(n int) {
 
 // CanMerge returns a boolean value indicating whether the other drawImageCommand can be merged
 // with the drawImageCommand c.
-func (c *drawImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) bool {
+func (c *drawImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
 	if c.dst != dst {
 		return false
 	}
@@ -333,7 +333,7 @@ func (c *replacePixelsCommand) AddNumVertices(n int) {
 func (c *replacePixelsCommand) AddNumIndices(n int) {
 }
 
-func (c *replacePixelsCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) bool {
+func (c *replacePixelsCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
 	return false
 }
 
@@ -374,7 +374,7 @@ func (c *pixelsCommand) AddNumVertices(n int) {
 func (c *pixelsCommand) AddNumIndices(n int) {
 }
 
-func (c *pixelsCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) bool {
+func (c *pixelsCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
 	return false
 }
 
@@ -413,7 +413,7 @@ func (c *disposeCommand) AddNumVertices(n int) {
 func (c *disposeCommand) AddNumIndices(n int) {
 }
 
-func (c *disposeCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) bool {
+func (c *disposeCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
 	return false
 }
 
@@ -473,7 +473,7 @@ func (c *newImageCommand) AddNumVertices(n int) {
 func (c *newImageCommand) AddNumIndices(n int) {
 }
 
-func (c *newImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) bool {
+func (c *newImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
 	return false
 }
 
@@ -512,6 +512,6 @@ func (c *newScreenFramebufferImageCommand) AddNumVertices(n int) {
 func (c *newScreenFramebufferImageCommand) AddNumIndices(n int) {
 }
 
-func (c *newScreenFramebufferImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) bool {
+func (c *newScreenFramebufferImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
 	return false
 }
diff --git a/internal/graphicscommand/image.go b/internal/graphicscommand/image.go
index 9968e6597..a4f12ab6b 100644
--- a/internal/graphicscommand/image.go
+++ b/internal/graphicscommand/image.go
@@ -87,7 +87,7 @@ func (i *Image) Size() (int, int) {
 	return i.width, i.height
 }
 
-func (i *Image) DrawImage(src *Image, vertices []float32, indices []uint16, clr *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) {
+func (i *Image) DrawImage(src *Image, vertices []float32, indices []uint16, clr *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) {
 	theCommandQueue.EnqueueDrawImageCommand(i, src, vertices, indices, clr, mode, filter)
 }
 
diff --git a/internal/opengl/context.go b/internal/opengl/context.go
index af2c5e9b8..2162c8795 100644
--- a/internal/opengl/context.go
+++ b/internal/opengl/context.go
@@ -16,6 +16,8 @@ package opengl
 
 import (
 	"math"
+
+	"github.com/hajimehoshi/ebiten/internal/graphics"
 )
 
 var (
@@ -43,6 +45,25 @@ var (
 	oneMinusDstAlpha operation
 )
 
+func convertOperation(op graphics.Operation) operation {
+	switch op {
+	case graphics.Zero:
+		return zero
+	case graphics.One:
+		return one
+	case graphics.SrcAlpha:
+		return srcAlpha
+	case graphics.DstAlpha:
+		return dstAlpha
+	case graphics.OneMinusSrcAlpha:
+		return oneMinusSrcAlpha
+	case graphics.OneMinusDstAlpha:
+		return oneMinusDstAlpha
+	default:
+		panic("not reached")
+	}
+}
+
 type Context struct {
 	locationCache      *locationCache
 	screenFramebuffer  Framebuffer // This might not be the default frame buffer '0' (e.g. iOS).
@@ -50,7 +71,7 @@ type Context struct {
 	lastTexture        Texture
 	lastViewportWidth  int
 	lastViewportHeight int
-	lastCompositeMode  CompositeMode
+	lastCompositeMode  graphics.CompositeMode
 	maxTextureSize     int
 	context
 }
diff --git a/internal/opengl/context_desktop.go b/internal/opengl/context_desktop.go
index 7fde3698f..5042a4a1f 100644
--- a/internal/opengl/context_desktop.go
+++ b/internal/opengl/context_desktop.go
@@ -24,6 +24,8 @@ import (
 	"fmt"
 
 	"github.com/go-gl/gl/v2.1/gl"
+
+	"github.com/hajimehoshi/ebiten/internal/graphics"
 )
 
 type (
@@ -105,12 +107,12 @@ func (c *Context) Reset() error {
 	c.lastFramebuffer = invalidFramebuffer
 	c.lastViewportWidth = 0
 	c.lastViewportHeight = 0
-	c.lastCompositeMode = CompositeModeUnknown
+	c.lastCompositeMode = graphics.CompositeModeUnknown
 	_ = c.runOnContextThread(func() error {
 		gl.Enable(gl.BLEND)
 		return nil
 	})
-	c.BlendFunc(CompositeModeSourceOver)
+	c.BlendFunc(graphics.CompositeModeSourceOver)
 	_ = c.runOnContextThread(func() error {
 		f := int32(0)
 		gl.GetIntegerv(gl.FRAMEBUFFER_BINDING, &f)
@@ -120,14 +122,15 @@ func (c *Context) Reset() error {
 	return nil
 }
 
-func (c *Context) BlendFunc(mode CompositeMode) {
+func (c *Context) BlendFunc(mode graphics.CompositeMode) {
 	_ = c.runOnContextThread(func() error {
 		if c.lastCompositeMode == mode {
 			return nil
 		}
 		c.lastCompositeMode = mode
-		s, d := operations(mode)
-		gl.BlendFunc(uint32(s), uint32(d))
+		s, d := mode.Operations()
+		s2, d2 := convertOperation(s), convertOperation(d)
+		gl.BlendFunc(uint32(s2), uint32(d2))
 		return nil
 	})
 }
diff --git a/internal/opengl/context_js.go b/internal/opengl/context_js.go
index d64024d55..1a196bbc9 100644
--- a/internal/opengl/context_js.go
+++ b/internal/opengl/context_js.go
@@ -21,6 +21,8 @@ import (
 	"fmt"
 
 	"github.com/gopherjs/gopherwasm/js"
+
+	"github.com/hajimehoshi/ebiten/internal/graphics"
 )
 
 type (
@@ -149,23 +151,24 @@ func (c *Context) Reset() error {
 	c.lastFramebuffer = Framebuffer(js.Null())
 	c.lastViewportWidth = 0
 	c.lastViewportHeight = 0
-	c.lastCompositeMode = CompositeModeUnknown
+	c.lastCompositeMode = graphics.CompositeModeUnknown
 	gl := c.gl
 	gl.Call("enable", blend)
-	c.BlendFunc(CompositeModeSourceOver)
+	c.BlendFunc(graphics.CompositeModeSourceOver)
 	f := gl.Call("getParameter", framebufferBinding)
 	c.screenFramebuffer = Framebuffer(f)
 	return nil
 }
 
-func (c *Context) BlendFunc(mode CompositeMode) {
+func (c *Context) BlendFunc(mode graphics.CompositeMode) {
 	if c.lastCompositeMode == mode {
 		return
 	}
 	c.lastCompositeMode = mode
-	s, d := operations(mode)
+	s, d := mode.Operations()
+	s2, d2 := convertOperation(s), convertOperation(d)
 	gl := c.gl
-	gl.Call("blendFunc", int(s), int(d))
+	gl.Call("blendFunc", int(s2), int(d2))
 }
 
 func (c *Context) NewTexture(width, height int) (Texture, error) {
diff --git a/internal/opengl/context_mobile.go b/internal/opengl/context_mobile.go
index f24261676..443a2f5d4 100644
--- a/internal/opengl/context_mobile.go
+++ b/internal/opengl/context_mobile.go
@@ -21,6 +21,8 @@ import (
 	"fmt"
 
 	mgl "golang.org/x/mobile/gl"
+
+	"github.com/hajimehoshi/ebiten/internal/graphics"
 )
 
 type (
@@ -111,23 +113,24 @@ func (c *Context) Reset() error {
 	c.lastFramebuffer = invalidFramebuffer
 	c.lastViewportWidth = 0
 	c.lastViewportHeight = 0
-	c.lastCompositeMode = CompositeModeUnknown
+	c.lastCompositeMode = graphics.CompositeModeUnknown
 	c.gl.Enable(mgl.BLEND)
-	c.BlendFunc(CompositeModeSourceOver)
+	c.BlendFunc(graphics.CompositeModeSourceOver)
 	f := c.gl.GetInteger(mgl.FRAMEBUFFER_BINDING)
 	c.screenFramebuffer = Framebuffer(mgl.Framebuffer{uint32(f)})
 	// TODO: Need to update screenFramebufferWidth/Height?
 	return nil
 }
 
-func (c *Context) BlendFunc(mode CompositeMode) {
+func (c *Context) BlendFunc(mode graphics.CompositeMode) {
 	gl := c.gl
 	if c.lastCompositeMode == mode {
 		return
 	}
 	c.lastCompositeMode = mode
-	s, d := operations(mode)
-	gl.BlendFunc(mgl.Enum(s), mgl.Enum(d))
+	s, d := mode.Operations()
+	s2, d2 := convertOperation(s), convertOperation(d)
+	gl.BlendFunc(mgl.Enum(s2), mgl.Enum(d2))
 }
 
 func (c *Context) NewTexture(width, height int) (Texture, error) {
diff --git a/internal/opengl/types.go b/internal/opengl/types.go
index a1272d00b..6af1dee20 100644
--- a/internal/opengl/types.go
+++ b/internal/opengl/types.go
@@ -22,58 +22,6 @@ type (
 	operation   int
 )
 
-type CompositeMode int
-
-const (
-	CompositeModeSourceOver CompositeMode = iota // This value must be 0 (= initial value)
-	CompositeModeClear
-	CompositeModeCopy
-	CompositeModeDestination
-	CompositeModeDestinationOver
-	CompositeModeSourceIn
-	CompositeModeDestinationIn
-	CompositeModeSourceOut
-	CompositeModeDestinationOut
-	CompositeModeSourceAtop
-	CompositeModeDestinationAtop
-	CompositeModeXor
-	CompositeModeLighter
-	CompositeModeUnknown
-)
-
-func operations(mode CompositeMode) (src operation, dst operation) {
-	switch mode {
-	case CompositeModeSourceOver:
-		return one, oneMinusSrcAlpha
-	case CompositeModeClear:
-		return zero, zero
-	case CompositeModeCopy:
-		return one, zero
-	case CompositeModeDestination:
-		return zero, one
-	case CompositeModeDestinationOver:
-		return oneMinusDstAlpha, one
-	case CompositeModeSourceIn:
-		return dstAlpha, zero
-	case CompositeModeDestinationIn:
-		return zero, srcAlpha
-	case CompositeModeSourceOut:
-		return oneMinusDstAlpha, zero
-	case CompositeModeDestinationOut:
-		return zero, oneMinusSrcAlpha
-	case CompositeModeSourceAtop:
-		return dstAlpha, oneMinusSrcAlpha
-	case CompositeModeDestinationAtop:
-		return oneMinusDstAlpha, srcAlpha
-	case CompositeModeXor:
-		return oneMinusDstAlpha, oneMinusSrcAlpha
-	case CompositeModeLighter:
-		return one, one
-	default:
-		panic("not reached")
-	}
-}
-
 type DataType int
 
 func (d DataType) SizeInBytes() int {
diff --git a/internal/restorable/image.go b/internal/restorable/image.go
index 0cabeb4e9..e7fec2e2c 100644
--- a/internal/restorable/image.go
+++ b/internal/restorable/image.go
@@ -24,7 +24,6 @@ import (
 	"github.com/hajimehoshi/ebiten/internal/graphicscommand"
 	"github.com/hajimehoshi/ebiten/internal/graphicsutil"
 	"github.com/hajimehoshi/ebiten/internal/math"
-	"github.com/hajimehoshi/ebiten/internal/opengl"
 )
 
 // drawImageHistoryItem is an item for history of draw-image commands.
@@ -33,7 +32,7 @@ type drawImageHistoryItem struct {
 	vertices []float32
 	indices  []uint16
 	colorm   *affine.ColorM
-	mode     opengl.CompositeMode
+	mode     graphics.CompositeMode
 	filter   graphics.Filter
 }
 
@@ -167,7 +166,7 @@ func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
 			float32(x), float32(y),
 			1, 1, 1, 1)
 		is := graphicsutil.QuadIndices()
-		i.image.DrawImage(dummyImage.image, vs, is, colorm, opengl.CompositeModeCopy, graphics.FilterNearest)
+		i.image.DrawImage(dummyImage.image, vs, is, colorm, graphics.CompositeModeCopy, graphics.FilterNearest)
 	}
 
 	if x == 0 && y == 0 && width == w && height == h {
@@ -204,7 +203,7 @@ func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
 }
 
 // DrawImage draws a given image img to the image.
-func (i *Image) DrawImage(img *Image, vertices []float32, indices []uint16, colorm *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) {
+func (i *Image) DrawImage(img *Image, vertices []float32, indices []uint16, colorm *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) {
 	if len(vertices) == 0 {
 		return
 	}
@@ -219,7 +218,7 @@ func (i *Image) DrawImage(img *Image, vertices []float32, indices []uint16, colo
 }
 
 // appendDrawImageHistory appends a draw-image history item to the image.
-func (i *Image) appendDrawImageHistory(image *Image, vertices []float32, indices []uint16, colorm *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) {
+func (i *Image) appendDrawImageHistory(image *Image, vertices []float32, indices []uint16, colorm *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) {
 	if i.stale || i.volatile || i.screen {
 		return
 	}
diff --git a/internal/restorable/images_test.go b/internal/restorable/images_test.go
index 40fbb49e9..5dc735633 100644
--- a/internal/restorable/images_test.go
+++ b/internal/restorable/images_test.go
@@ -24,7 +24,6 @@ import (
 	"github.com/hajimehoshi/ebiten"
 	"github.com/hajimehoshi/ebiten/internal/graphics"
 	"github.com/hajimehoshi/ebiten/internal/graphicsutil"
-	"github.com/hajimehoshi/ebiten/internal/opengl"
 	. "github.com/hajimehoshi/ebiten/internal/restorable"
 	"github.com/hajimehoshi/ebiten/internal/testflock"
 )
@@ -118,7 +117,7 @@ func TestRestoreChain(t *testing.T) {
 		w, h := imgs[i].Size()
 		vs := graphicsutil.QuadVertices(w, h, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
 		is := graphicsutil.QuadIndices()
-		imgs[i+1].DrawImage(imgs[i], vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+		imgs[i+1].DrawImage(imgs[i], vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 	}
 	ResolveStaleImages()
 	if err := Restore(); err != nil {
@@ -160,10 +159,10 @@ func TestRestoreChain2(t *testing.T) {
 
 	vs := graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	imgs[8].DrawImage(imgs[7], vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
-	imgs[9].DrawImage(imgs[8], vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+	imgs[8].DrawImage(imgs[7], vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
+	imgs[9].DrawImage(imgs[8], vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 	for i := 0; i < 7; i++ {
-		imgs[i+1].DrawImage(imgs[i], vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+		imgs[i+1].DrawImage(imgs[i], vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 	}
 
 	ResolveStaleImages()
@@ -206,10 +205,10 @@ func TestRestoreOverrideSource(t *testing.T) {
 	fill(img1, clr0.R, clr0.G, clr0.B, clr0.A)
 	vs := graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	img2.DrawImage(img1, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
-	img3.DrawImage(img2, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img2.DrawImage(img1, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
+	img3.DrawImage(img2, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	fill(img0, clr1.R, clr1.G, clr1.B, clr1.A)
-	img1.DrawImage(img0, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img1.DrawImage(img0, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	ResolveStaleImages()
 	if err := Restore(); err != nil {
 		t.Fatal(err)
@@ -291,23 +290,23 @@ func TestRestoreComplexGraph(t *testing.T) {
 	}()
 	vs := graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	img3.DrawImage(img0, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img3.DrawImage(img0, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	vs = graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1)
-	img3.DrawImage(img1, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img3.DrawImage(img1, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	vs = graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1)
-	img4.DrawImage(img1, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img4.DrawImage(img1, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	vs = graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 2, 0, 1, 1, 1, 1)
-	img4.DrawImage(img2, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img4.DrawImage(img2, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	vs = graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
-	img5.DrawImage(img3, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img5.DrawImage(img3, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	vs = graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
-	img6.DrawImage(img3, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img6.DrawImage(img3, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	vs = graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1)
-	img6.DrawImage(img4, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img6.DrawImage(img4, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	vs = graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
-	img7.DrawImage(img2, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img7.DrawImage(img2, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	vs = graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 2, 0, 1, 1, 1, 1)
-	img7.DrawImage(img3, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img7.DrawImage(img3, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	ResolveStaleImages()
 	if err := Restore(); err != nil {
 		t.Fatal(err)
@@ -399,8 +398,8 @@ func TestRestoreRecursive(t *testing.T) {
 	}()
 	vs := graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	img1.DrawImage(img0, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
-	img0.DrawImage(img1, vs, is, nil, opengl.CompositeModeSourceOver, graphics.FilterNearest)
+	img1.DrawImage(img0, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
+	img0.DrawImage(img1, vs, is, nil, graphics.CompositeModeSourceOver, graphics.FilterNearest)
 	ResolveStaleImages()
 	if err := Restore(); err != nil {
 		t.Fatal(err)
@@ -487,7 +486,7 @@ func TestDrawImageAndReplacePixels(t *testing.T) {
 
 	vs := graphicsutil.QuadVertices(1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	img1.DrawImage(img0, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+	img1.DrawImage(img0, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 	img1.ReplacePixels([]byte{0xff, 0xff, 0xff, 0xff}, 1, 0, 1, 1)
 
 	ResolveStaleImages()
@@ -519,8 +518,8 @@ func TestDispose(t *testing.T) {
 
 	vs := graphicsutil.QuadVertices(1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	img1.DrawImage(img2, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
-	img0.DrawImage(img1, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+	img1.DrawImage(img2, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
+	img0.DrawImage(img1, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 	img1.Dispose()
 
 	ResolveStaleImages()
@@ -547,7 +546,7 @@ func TestDoubleResolve(t *testing.T) {
 
 	vs := graphicsutil.QuadVertices(1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	img0.DrawImage(img1, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+	img0.DrawImage(img1, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 	img0.ReplacePixels([]uint8{0x00, 0xff, 0x00, 0xff}, 1, 1, 1, 1)
 	// Now img0 is stale.
 	ResolveStaleImages()
diff --git a/internal/shareable/shareable.go b/internal/shareable/shareable.go
index d54d7bd75..305c202d5 100644
--- a/internal/shareable/shareable.go
+++ b/internal/shareable/shareable.go
@@ -24,7 +24,6 @@ import (
 	"github.com/hajimehoshi/ebiten/internal/affine"
 	"github.com/hajimehoshi/ebiten/internal/graphics"
 	"github.com/hajimehoshi/ebiten/internal/graphicsutil"
-	"github.com/hajimehoshi/ebiten/internal/opengl"
 	"github.com/hajimehoshi/ebiten/internal/packing"
 	"github.com/hajimehoshi/ebiten/internal/restorable"
 )
@@ -65,7 +64,7 @@ func (b *backend) TryAlloc(width, height int) (*packing.Node, bool) {
 	w, h := oldImg.Size()
 	vs := graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	newImg.DrawImage(oldImg, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+	newImg.DrawImage(oldImg, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 	oldImg.Dispose()
 	b.restorable = newImg
 
@@ -131,7 +130,7 @@ func (i *Image) ensureNotShared() {
 	vw, vh := i.backend.restorable.Size()
 	vs := graphicsutil.QuadVertices(vw, vh, x, y, x+w, y+h, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	newImg.DrawImage(i.backend.restorable, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+	newImg.DrawImage(i.backend.restorable, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 
 	i.dispose(false)
 	i.backend = &backend{
@@ -204,7 +203,7 @@ func (i *Image) Vertex(dx, dy, sx, sy float32, cr, cg, cb, ca float32) []float32
 
 const MaxCountForShare = 10
 
-func (i *Image) DrawImage(img *Image, vertices []float32, indices []uint16, colorm *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) {
+func (i *Image) DrawImage(img *Image, vertices []float32, indices []uint16, colorm *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) {
 	backendsM.Lock()
 	defer backendsM.Unlock()
 
diff --git a/internal/shareable/shareable_test.go b/internal/shareable/shareable_test.go
index b7e19b308..0e4de31a2 100644
--- a/internal/shareable/shareable_test.go
+++ b/internal/shareable/shareable_test.go
@@ -24,7 +24,6 @@ import (
 	"github.com/hajimehoshi/ebiten"
 	"github.com/hajimehoshi/ebiten/internal/graphics"
 	"github.com/hajimehoshi/ebiten/internal/graphicsutil"
-	"github.com/hajimehoshi/ebiten/internal/opengl"
 	. "github.com/hajimehoshi/ebiten/internal/shareable"
 	"github.com/hajimehoshi/ebiten/internal/testflock"
 )
@@ -88,7 +87,7 @@ func TestEnsureNotShared(t *testing.T) {
 	// img4.ensureNotShared() should be called.
 	vs := img3.QuadVertices(0, 0, size/2, size/2, 1, 0, 0, 1, size/4, size/4, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	img4.DrawImage(img3, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+	img4.DrawImage(img3, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 	want := false
 	if got := img4.IsSharedForTesting(); got != want {
 		t.Errorf("got: %v, want: %v", got, want)
@@ -110,7 +109,7 @@ func TestEnsureNotShared(t *testing.T) {
 
 	// Check further drawing doesn't cause panic.
 	// This bug was fixed by 03dcd948.
-	img4.DrawImage(img3, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+	img4.DrawImage(img3, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 }
 
 func Disabled_TestReshared(t *testing.T) {
@@ -152,7 +151,7 @@ func Disabled_TestReshared(t *testing.T) {
 	// Use img1 as a render target.
 	vs := img2.QuadVertices(0, 0, size, size, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
 	is := graphicsutil.QuadIndices()
-	img1.DrawImage(img2, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+	img1.DrawImage(img2, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 	want = false
 	if got := img1.IsSharedForTesting(); got != want {
 		t.Errorf("got: %v, want: %v", got, want)
@@ -160,7 +159,7 @@ func Disabled_TestReshared(t *testing.T) {
 
 	// Use img1 as a render source.
 	for i := 0; i < MaxCountForShare-1; i++ {
-		img0.DrawImage(img1, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+		img0.DrawImage(img1, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 		want := false
 		if got := img1.IsSharedForTesting(); got != want {
 			t.Errorf("got: %v, want: %v", got, want)
@@ -177,7 +176,7 @@ func Disabled_TestReshared(t *testing.T) {
 		}
 	}
 
-	img0.DrawImage(img1, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+	img0.DrawImage(img1, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 	want = true
 	if got := img1.IsSharedForTesting(); got != want {
 		t.Errorf("got: %v, want: %v", got, want)
@@ -195,7 +194,7 @@ func Disabled_TestReshared(t *testing.T) {
 
 	// Use img3 as a render source. img3 never uses a shared texture.
 	for i := 0; i < MaxCountForShare*2; i++ {
-		img0.DrawImage(img3, vs, is, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
+		img0.DrawImage(img3, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
 		want := false
 		if got := img3.IsSharedForTesting(); got != want {
 			t.Errorf("got: %v, want: %v", got, want)