graphics: Remove offsetX/offsetY from framebuffer

internal/graphics/command.go

@@ -371,11 +371,9 @@ func (c *newImageCommand) Exec(indexOffsetInBytes int) error {
 
 // newScreenFramebufferImageCommand is a command to create a special image for the screen.
 type newScreenFramebufferImageCommand struct {
-	result  *Image
-	width   int
-	height  int
-	offsetX float64
-	offsetY float64
+	result *Image
+	width  int
+	height int
 }
 
 // Exec executes a newScreenFramebufferImageCommand.
@@ -389,6 +387,6 @@ 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 = newScreenFramebuffer(c.width, c.height, c.offsetX, c.offsetY)
+	c.result.framebuffer = newScreenFramebuffer(c.width, c.height)
 	return nil
 }

internal/graphics/framebuffer.go

@@ -43,11 +43,6 @@ type framebuffer struct {
 	proMatrix []float32
 	width     int
 	height    int
-
-	// offsetX and offsetY are translation part of the projection matrix.
-	// offsetX and offsetY are used for the fullscreen mode.
-	offsetX float64
-	offsetY float64
 }
 
 // newFramebufferFromTexture creates a framebuffer from the given texture.
@@ -64,14 +59,12 @@ func newFramebufferFromTexture(texture *texture, width, height int) (*framebuffe
 }
 
 // newScreenFramebuffer creates a framebuffer for the screen.
-func newScreenFramebuffer(width, height int, offsetX, offsetY float64) *framebuffer {
+func newScreenFramebuffer(width, height int) *framebuffer {
 	return &framebuffer{
-		native:  opengl.GetContext().ScreenFramebuffer(),
-		flipY:   true,
-		width:   width,
-		height:  height,
-		offsetX: offsetX,
-		offsetY: offsetY,
+		native: opengl.GetContext().ScreenFramebuffer(),
+		flipY:  true,
+		width:  width,
+		height: height,
 	}
 }
 

internal/graphics/image.go

@@ -60,17 +60,15 @@ func NewImageFromImage(img *image.RGBA, width, height int) *Image {
 	return i
 }
 
-func NewScreenFramebufferImage(width, height int, offsetX, offsetY float64) *Image {
+func NewScreenFramebufferImage(width, height int) *Image {
 	i := &Image{
 		width:  width,
 		height: height,
 	}
 	c := &newScreenFramebufferImageCommand{
-		result:  i,
-		width:   width,
-		height:  height,
-		offsetX: offsetX,
-		offsetY: offsetY,
+		result: i,
+		width:  width,
+		height: height,
 	}
 	theCommandQueue.Enqueue(c)
 	return i

internal/restorable/image.go

@@ -119,7 +119,7 @@ func NewImageFromImage(source image.Image) *Image {
 // NewScreenFramebufferImage creates a special image that framebuffer is one for the screen.
 func NewScreenFramebufferImage(width, height int, paddingX0, paddingY0, paddingX1, paddingY1 float64) *Image {
 	i := &Image{
-		image:     graphics.NewScreenFramebufferImage(width, height, paddingX0, paddingY0),
+		image:     graphics.NewScreenFramebufferImage(width, height),
 		volatile:  true,
 		screen:    true,
 		paddingX0: paddingX0,
@@ -322,7 +322,7 @@ func (i *Image) restore() error {
 	if i.screen {
 		// The screen image should also be recreated because framebuffer might
 		// be changed.
-		i.image = graphics.NewScreenFramebufferImage(w, h, i.paddingX0, i.paddingY0)
+		i.image = graphics.NewScreenFramebufferImage(w, h)
 		i.basePixels = nil
 		i.drawImageHistory = nil
 		i.stale = false