opengl: Add Image struct

internal/graphicscommand/command.go

@@ -245,7 +245,7 @@ func (c *drawImageCommand) Exec(indexOffsetInBytes int) error {
 	proj := f.ProjectionMatrix()
 	dw, dh := c.dst.Size()
 	sw, sh := c.src.Size()
-	opengl.UseProgram(proj, c.src.texture, dw, dh, sw, sh, c.color, c.filter)
+	opengl.UseProgram(proj, c.src.image.Texture, dw, dh, sw, sh, c.color, c.filter)
 	opengl.GetContext().DrawElements(c.nindices, indexOffsetInBytes)
 
 	// glFlush() might be necessary at least on MacBook Pro (a smilar problem at #419),
@@ -311,7 +311,7 @@ func (c *replacePixelsCommand) Exec(indexOffsetInBytes int) error {
 	// glFlush is necessary on Android.
 	// glTexSubImage2D didn't work without this hack at least on Nexus 5x and NuAns NEO [Reloaded] (#211).
 	opengl.GetContext().Flush()
-	opengl.GetContext().TexSubImage2D(c.dst.texture, c.pixels, c.x, c.y, c.width, c.height)
+	opengl.GetContext().TexSubImage2D(c.dst.image.Texture, c.pixels, c.x, c.y, c.width, c.height)
 	return nil
 }
 
@@ -344,7 +344,8 @@ func (c *pixelsCommand) Exec(indexOffsetInBytes int) error {
 	if err != nil {
 		return err
 	}
-	p, err := opengl.GetContext().FramebufferPixels(f, c.img.width, c.img.height)
+	w, h := c.img.Size()
+	p, err := opengl.GetContext().FramebufferPixels(f, w, h)
 	if err != nil {
 		return err
 	}
@@ -385,11 +386,11 @@ func (c *disposeCommand) String() string {
 
 // Exec executes the disposeCommand.
 func (c *disposeCommand) Exec(indexOffsetInBytes int) error {
-	if c.target.framebuffer != nil {
-		c.target.framebuffer.Delete()
+	if c.target.image.Framebuffer != nil {
+		c.target.image.Framebuffer.Delete()
 	}
-	if c.target.texture != *new(opengl.Texture) {
-		opengl.GetContext().DeleteTexture(c.target.texture)
+	if c.target.image.Texture != *new(opengl.Texture) {
+		opengl.GetContext().DeleteTexture(c.target.image.Texture)
 	}
 	return nil
 }
@@ -448,7 +449,7 @@ func (c *newImageCommand) Exec(indexOffsetInBytes int) error {
 	if err != nil {
 		return err
 	}
-	c.result.texture = t
+	c.result.image.Texture = t
 	return nil
 }
 
@@ -487,7 +488,7 @@ func (c *newScreenFramebufferImageCommand) Exec(indexOffsetInBytes int) error {
 	// The (default) framebuffer size can't be converted to a power of 2.
 	// On browsers, c.width and c.height are used as viewport size and
 	// Edge can't treat a bigger viewport than the drawing area (#71).
-	c.result.framebuffer = opengl.NewScreenFramebuffer(c.width, c.height)
+	c.result.image.Framebuffer = opengl.NewScreenFramebuffer(c.width, c.height)
 	return nil
 }
 

internal/graphicscommand/image.go

@@ -42,16 +42,12 @@ func MaxImageSize() int {
 
 // Image represents an image that is implemented with OpenGL.
 type Image struct {
-	texture     opengl.Texture
-	framebuffer *opengl.Framebuffer
-	width       int
-	height      int
+	image *opengl.Image
 }
 
 func NewImage(width, height int) *Image {
 	i := &Image{
-		width:  width,
-		height: height,
+		image: opengl.NewImage(width, height),
 	}
 	c := &newImageCommand{
 		result: i,
@@ -64,8 +60,7 @@ func NewImage(width, height int) *Image {
 
 func NewScreenFramebufferImage(width, height int) *Image {
 	i := &Image{
-		width:  width,
-		height: height,
+		image: opengl.NewImage(width, height),
 	}
 	c := &newScreenFramebufferImageCommand{
 		result: i,
@@ -84,7 +79,7 @@ func (i *Image) Dispose() {
 }
 
 func (i *Image) Size() (int, int) {
-	return i.width, i.height
+	return i.image.Size()
 }
 
 func (i *Image) DrawImage(src *Image, vertices []float32, indices []uint16, clr *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) {
@@ -118,17 +113,18 @@ func (i *Image) ReplacePixels(p []byte, x, y, width, height int) {
 }
 
 func (i *Image) IsInvalidated() bool {
-	return !opengl.GetContext().IsTexture(i.texture)
+	return i.image.IsInvalidated()
 }
 
 func (i *Image) ensureFramebuffer() (*opengl.Framebuffer, error) {
-	if i.framebuffer != nil {
-		return i.framebuffer, nil
+	if i.image.Framebuffer != nil {
+		return i.image.Framebuffer, nil
 	}
-	f, err := opengl.NewFramebufferFromTexture(i.texture, math.NextPowerOf2Int(i.width), math.NextPowerOf2Int(i.height))
+	w, h := i.image.Size()
+	f, err := opengl.NewFramebufferFromTexture(i.image.Texture, math.NextPowerOf2Int(w), math.NextPowerOf2Int(h))
 	if err != nil {
 		return nil, err
 	}
-	i.framebuffer = f
-	return i.framebuffer, nil
+	i.image.Framebuffer = f
+	return i.image.Framebuffer, nil
 }

internal/opengl/context_desktop.go

@@ -211,7 +211,7 @@ func (c *Context) DeleteTexture(t Texture) {
 	})
 }
 
-func (c *Context) IsTexture(t Texture) bool {
+func (c *Context) isTexture(t Texture) bool {
 	r := false
 	_ = c.runOnContextThread(func() error {
 		r = gl.IsTexture(uint32(t))

internal/opengl/context_js.go

@@ -236,7 +236,7 @@ func (c *Context) DeleteTexture(t Texture) {
 	gl.Call("deleteTexture", js.Value(t))
 }
 
-func (c *Context) IsTexture(t Texture) bool {
+func (c *Context) isTexture(t Texture) bool {
 	gl := c.gl
 	return gl.Call("isTexture", js.Value(t)).Bool()
 }

internal/opengl/context_mobile.go

@@ -186,7 +186,7 @@ func (c *Context) DeleteTexture(t Texture) {
 	gl.DeleteTexture(mgl.Texture(t))
 }
 
-func (c *Context) IsTexture(t Texture) bool {
+func (c *Context) isTexture(t Texture) bool {
 	gl := c.gl
 	return gl.IsTexture(mgl.Texture(t))
 }

internal/opengl/image.go

@@ -0,0 +1,37 @@
+// 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 opengl
+
+type Image struct {
+	Texture     Texture
+	Framebuffer *Framebuffer
+	width       int
+	height      int
+}
+
+func NewImage(width, height int) *Image {
+	return &Image{
+		width:  width,
+		height: height,
+	}
+}
+
+func (i *Image) Size() (int, int) {
+	return i.width, i.height
+}
+
+func (i *Image) IsInvalidated() bool {
+	return !theContext.isTexture(i.Texture)
+}