ebiten: Remove IsDrawingSkipped

Fixes #1127

imagedumper_desktop.go

@@ -154,10 +154,7 @@ func (i *imageDumper) update(screen *Image) error {
 		}
 	}
 
-	if IsDrawingSkipped() {
+	// TODO: As the screen will be available only from Draw, move this to a drawing function.
-		return nil
-	}
-
 	return i.dump(screen)
 }
 

run.go

@@ -78,19 +78,10 @@ func CurrentFPS() float64 {
 }
 
 var (
-	isDrawingSkipped          = int32(0)
 	isScreenClearedEveryFrame = int32(1)
 	currentMaxTPS             = int32(DefaultTPS)
 )
 
-func setDrawingSkipped(skipped bool) {
-	v := int32(0)
-	if skipped {
-		v = 1
-	}
-	atomic.StoreInt32(&isDrawingSkipped, v)
-}
-
 // SetScreenClearedEveryFrame enables or disables the clearing of the screen at the beginning of each frame.
 // The default value is false and the screen is cleared each frame by default.
 //
@@ -111,36 +102,6 @@ func IsScreenClearedEveryFrame() bool {
 	return atomic.LoadInt32(&isScreenClearedEveryFrame) != 0
 }
 
-// IsDrawingSkipped returns true if rendering result is not adopted.
-// It is recommended to skip drawing images or screen
-// when IsDrawingSkipped is true.
-//
-// The typical code with IsDrawingSkipped is this:
-//
-//    func update(screen *ebiten.Image) error {
-//
-//        // Update the state.
-//
-//        // When IsDrawingSkipped is true, the rendered result is not adopted.
-//        // Skip rendering then.
-//        if ebiten.IsDrawingSkipped() {
-//            return nil
-//        }
-//
-//        // Draw something to the screen.
-//
-//        return nil
-//    }
-//
-// IsDrawingSkipped is useful if you use Run function or RunGame function without implementing Game's Draw.
-// Otherwise, i.e., if you use RunGame function with implementing Game's Draw, IsDrawingSkipped should not be used.
-// If you use RunGame and Draw, IsDrawingSkipped always returns true.
-//
-// IsDrawingSkipped is concurrent-safe.
-func IsDrawingSkipped() bool {
-	return atomic.LoadInt32(&isDrawingSkipped) != 0
-}
-
 type imageDumperGame struct {
 	game Game
 	d    *imageDumper

uicontext.go

@@ -179,6 +179,7 @@ func (c *uiContext) Draw() error {
 }
 
 func (c *uiContext) update() error {
+	// TODO: Move the clock usage to the UI driver side.
 	updateCount := clock.Update(MaxTPS())
 
 	// Ensure that Update is called once before Draw so that Update can be used for initialization.
@@ -190,9 +191,6 @@ func (c *uiContext) update() error {
 	for i := 0; i < updateCount; i++ {
 		c.updateOffscreen()
 
-		// TODO: Move the clock usage to the UI driver side.
-		setDrawingSkipped(i < updateCount-1)
-
 		if err := hooks.RunBeforeUpdateHooks(); err != nil {
 			return err
 		}