graphics: Add commands to create textures/framebuffers

image.go

@@ -311,15 +311,12 @@ func (i *imageImpl) restorePixels(context *opengl.Context) error {
 	for j := 0; j < i.height; j++ {
 		copy(img.Pix[j*img.Stride:], i.pixels[j*i.width*4:(j+1)*i.width*4])
 	}
-	var err error
-	i.texture, err = graphics.NewTextureFromImage(ui.GLContext(), img, glFilter(ui.GLContext(), i.filter))
-	if err != nil {
-		return err
-	}
-	i.framebuffer, err = graphics.NewFramebufferFromTexture(ui.GLContext(), i.texture)
+	texture, framebuffer, err := graphics.NewImageFromImage(img, glFilter(ui.GLContext(), i.filter))
 	if err != nil {
 		return err
 	}
+	i.texture = texture
+	i.framebuffer = framebuffer
 	return nil
 }
 
@@ -400,15 +397,10 @@ func NewImage(width, height int, filter Filter) (*Image, error) {
 	f := func() error {
 		imageM.Lock()
 		defer imageM.Unlock()
-		texture, err := graphics.NewTexture(ui.GLContext(), width, height, glFilter(ui.GLContext(), filter))
+		texture, framebuffer, err := graphics.NewImage(width, height, glFilter(ui.GLContext(), filter))
 		if err != nil {
 			return err
 		}
-		framebuffer, err := graphics.NewFramebufferFromTexture(ui.GLContext(), texture)
-		if err != nil {
-			// TODO: texture should be removed here?
-			return err
-		}
 		image.framebuffer = framebuffer
 		image.texture = texture
 		runtime.SetFinalizer(image, (*imageImpl).Dispose)
@@ -455,11 +447,7 @@ func NewImageFromImage(source image.Image, filter Filter) (*Image, error) {
 		}
 		imageM.Lock()
 		defer imageM.Unlock()
-		texture, err := graphics.NewTextureFromImage(ui.GLContext(), rgbaImg, glFilter(ui.GLContext(), filter))
-		if err != nil {
-			return err
-		}
-		framebuffer, err := graphics.NewFramebufferFromTexture(ui.GLContext(), texture)
+		texture, framebuffer, err := graphics.NewImageFromImage(rgbaImg, glFilter(ui.GLContext(), filter))
 		if err != nil {
 			// TODO: texture should be removed here?
 			return err
@@ -489,7 +477,7 @@ func newImageWithZeroFramebuffer(width, height int) (*Image, error) {
 func newImageWithZeroFramebufferImpl(width, height int) (*Image, error) {
 	imageM.Lock()
 	defer imageM.Unlock()
-	f, err := graphics.NewZeroFramebuffer(ui.GLContext(), width, height)
+	f, err := graphics.NewZeroFramebuffer(width, height)
 	if err != nil {
 		return nil, err
 	}

internal/graphics/command.go

@@ -17,6 +17,7 @@ package graphics
 import (
 	"errors"
 	"fmt"
+	"image"
 	"image/color"
 	"math"
 
@@ -159,3 +160,63 @@ func (c *disposeCommand) Exec(context *opengl.Context) error {
 	}
 	return nil
 }
+
+type newImageFromImageCommand struct {
+	texture     *Texture
+	framebuffer *Framebuffer
+	img         *image.RGBA
+	filter      opengl.Filter
+}
+
+func (c *newImageFromImageCommand) Exec(context *opengl.Context) error {
+	origSize := c.img.Bounds().Size()
+	if origSize.X < 4 {
+		return errors.New("graphics: width must be equal or more than 4.")
+	}
+	if origSize.Y < 4 {
+		return errors.New("graphics: height must be equal or more than 4.")
+	}
+	adjustedImage := adjustImageForTexture(c.img)
+	size := adjustedImage.Bounds().Size()
+	native, err := context.NewTexture(size.X, size.Y, adjustedImage.Pix, c.filter)
+	if err != nil {
+		return err
+	}
+	c.texture.native = native
+	c.texture.width = origSize.X
+	c.texture.height = origSize.Y
+	if err := c.framebuffer.initFromTexture(context, c.texture); err != nil {
+		return err
+	}
+	return nil
+}
+
+type newImageCommand struct {
+	texture     *Texture
+	framebuffer *Framebuffer
+	width       int
+	height      int
+	filter      opengl.Filter
+}
+
+func (c *newImageCommand) Exec(context *opengl.Context) error {
+	w := int(NextPowerOf2Int32(int32(c.width)))
+	h := int(NextPowerOf2Int32(int32(c.height)))
+	if w < 4 {
+		return errors.New("graphics: width must be equal or more than 4.")
+	}
+	if h < 4 {
+		return errors.New("graphics: height must be equal or more than 4.")
+	}
+	native, err := context.NewTexture(w, h, nil, c.filter)
+	if err != nil {
+		return err
+	}
+	c.texture.native = native
+	c.texture.width = c.width
+	c.texture.height = c.height
+	if err := c.framebuffer.initFromTexture(context, c.texture); err != nil {
+		return err
+	}
+	return nil
+}

internal/graphics/framebuffer.go

@@ -42,7 +42,7 @@ type Framebuffer struct {
 	proMatrix *[4][4]float64
 }
 
-func NewZeroFramebuffer(c *opengl.Context, width, height int) (*Framebuffer, error) {
+func NewZeroFramebuffer(width, height int) (*Framebuffer, error) {
 	f := &Framebuffer{
 		width:  width,
 		height: height,
@@ -51,17 +51,15 @@ func NewZeroFramebuffer(c *opengl.Context, width, height int) (*Framebuffer, err
 	return f, nil
 }
 
-func NewFramebufferFromTexture(c *opengl.Context, texture *Texture) (*Framebuffer, error) {
-	native, err := c.NewFramebuffer(opengl.Texture(texture.native))
+func (f *Framebuffer) initFromTexture(context *opengl.Context, texture *Texture) error {
+	native, err := context.NewFramebuffer(opengl.Texture(texture.native))
 	if err != nil {
-		return nil, err
+		return err
 	}
-	f := &Framebuffer{
-		native: native,
-		width:  texture.width,
-		height: texture.height,
-	}
-	return f, nil
+	f.native = native
+	f.width = texture.width
+	f.height = texture.height
+	return nil
 }
 
 func Dispose(texture *Texture, framebuffer *Framebuffer) error {

internal/graphics/texture.go

@@ -15,7 +15,6 @@
 package graphics
 
 import (
-	"errors"
 	"image"
 	"image/draw"
 
@@ -50,35 +49,29 @@ type Texture struct {
 	height int
 }
 
-func NewTexture(c *opengl.Context, width, height int, filter opengl.Filter) (*Texture, error) {
-	w := int(NextPowerOf2Int32(int32(width)))
-	h := int(NextPowerOf2Int32(int32(height)))
-	if w < 4 {
-		return nil, errors.New("width must be equal or more than 4.")
+func NewImage(width, height int, filter opengl.Filter) (*Texture, *Framebuffer, error) {
+	texture := &Texture{}
+	framebuffer := &Framebuffer{}
+	c := &newImageCommand{
+		texture:     texture,
+		framebuffer: framebuffer,
+		width:       width,
+		height:      height,
+		filter:      filter,
 	}
-	if h < 4 {
-		return nil, errors.New("height must be equal or more than 4.")
-	}
-	native, err := c.NewTexture(w, h, nil, filter)
-	if err != nil {
-		return nil, err
-	}
-	return &Texture{native, width, height}, nil
+	theCommandQueue.Enqueue(c)
+	return texture, framebuffer, nil
 }
 
-func NewTextureFromImage(c *opengl.Context, img *image.RGBA, filter opengl.Filter) (*Texture, error) {
-	origSize := img.Bounds().Size()
-	if origSize.X < 4 {
-		return nil, errors.New("width must be equal or more than 4.")
+func NewImageFromImage(img *image.RGBA, filter opengl.Filter) (*Texture, *Framebuffer, error) {
+	texture := &Texture{}
+	framebuffer := &Framebuffer{}
+	c := &newImageFromImageCommand{
+		texture:     texture,
+		framebuffer: framebuffer,
+		img:         img,
+		filter:      filter,
 	}
-	if origSize.Y < 4 {
-		return nil, errors.New("height must be equal or more than 4.")
-	}
-	adjustedImage := adjustImageForTexture(img)
-	size := adjustedImage.Bounds().Size()
-	native, err := c.NewTexture(size.X, size.Y, adjustedImage.Pix, filter)
-	if err != nil {
-		return nil, err
-	}
-	return &Texture{native, origSize.X, origSize.Y}, nil
+	theCommandQueue.Enqueue(c)
+	return texture, framebuffer, nil
 }