toggle directly in scene's Draw, but fails too

game.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
@@ -51,9 +53,6 @@ func (game *Game) Update() error {
 	scene := game.GetCurrentScene()
 	scene.Update()
 
-	// FIXME: should work, but doesn't
-	//ebiten.SetScreenClearedEveryFrame(scene.Clearscreen())
-
 	next := scene.GetNext()
 
 	if next != game.CurrentScene {
@@ -64,7 +63,7 @@ func (game *Game) Update() error {
 		game.CurrentScene = next
 	}
 
-	//fmt.Printf("Clear Screen: %t\n", ebiten.IsScreenClearedEveryFrame())
+	fmt.Printf("Clear Screen: %t\n", ebiten.IsScreenClearedEveryFrame())
 
 	return nil
 }

scene-menu.go

@@ -62,17 +62,11 @@ func (scene *SceneMenu) Update() error {
 }
 
 func (scene *SceneMenu) Draw(screen *ebiten.Image) {
-	//op := &ebiten.DrawImageOptions{}
-	// op.GeoM.Reset()
-	// op.GeoM.Translate(0, 0)
-
-	// screen.DrawImage(scene.Game.Screen, op)
-
+	ebiten.SetScreenClearedEveryFrame(false)
 	scene.Ui.Draw(screen)
 }
 
 func (scene *SceneMenu) Leave() {
-	ebiten.SetScreenClearedEveryFrame(true)
 	scene.SetNext(Play)
 }
 

scene-options.go

@@ -60,6 +60,7 @@ func (scene *SceneOptions) Update() error {
 }
 
 func (scene *SceneOptions) Draw(screen *ebiten.Image) {
+	ebiten.SetScreenClearedEveryFrame(false)
 	scene.Ui.Draw(screen)
 }
 

scene-play.go

@@ -158,16 +158,7 @@ func (scene *ScenePlay) CheckInput() {
 		os.Exit(0)
 	}
 
-	// FIXME: works from here
-	if inpututil.IsKeyJustPressed(ebiten.KeyK) {
-		scene.Clear = !scene.Clear
-		fmt.Printf("Clear: %t\n", scene.Clear)
-		ebiten.SetScreenClearedEveryFrame(scene.Clear)
-	}
-
-	// FIXME: and this does have no effect. WHY?!?!?
 	if inpututil.IsKeyJustPressed(ebiten.KeyEscape) {
-		ebiten.SetScreenClearedEveryFrame(false)
 		scene.SetNext(Menu)
 	}
 
@@ -412,6 +403,8 @@ func (scene *ScenePlay) ToggleCellOnCursorPos(alive int64) {
 
 // draw the new grid state
 func (scene *ScenePlay) Draw(screen *ebiten.Image) {
+	ebiten.SetScreenClearedEveryFrame(true)
+
 	// we  fill the whole  screen with  a background color,  the cells
 	// themselfes will be 1px smaller as their nominal size, producing
 	// a nice grey grid with grid lines