screen - Libgdx background and foreground in single stage -

my requirements:

1. background filling entire physical screen (stretching if required)
2. preserve aspect ratio of foreground assets (work virtual width , height)

for this, use 2 stages in screen shown in code below.

public void render(float delta) {     backgroundstage.act(delta);     backgroundstage.draw();     foregroundstage.act(delta);     foregroundstage.draw();     }  public void resize(int width, int height) {     background.setwidth(width);     background.setheight(height);     backgroundstage.setviewport(width, height, true);     foregroundstage.setviewport(maingame.width, maingame.height, true);     foregroundstage.getcamera().position.set(-foregroundstage.getgutterwidth(),-foregroundstage.getgutterheight(),0);     } 

in tutorials have read, have seen 1 stage being used each screen. so, how fulfill both requirements in single stage? expensive have separate stages? (i have read spritebatch objects heavy!)

this how solved problem:

to rid of background stage, updated render , resize functions follows. basically, shifted bottom right corner of background (-gutterwidth,-gutterheight) , added twice values of gutter width , height region width , height of texture region. stage gone :-)

public void render(float delta) {     gdx.gl.glclearcolor(0, 1, 0, 0.5f);     gdx.gl.glclear(gl10.gl_color_buffer_bit | gl10.gl_depth_buffer_bit);     foregroundstage.getspritebatch().begin();     foregroundstage.getspritebatch().draw(backgroundimage,-gw,-gh,backgroundimage.getregionwidth()+2*gw,backgroundimage.getregionheight()+2*gh);     foregroundstage.getspritebatch().end();     foregroundstage.act(delta);     foregroundstage.draw();   public void resize(int width, int height) {     screenw = width;     screenh = height;     foregroundstage.setviewport(maingame.width, maingame.height, true);     gw = foregroundstage.getgutterwidth();     gh = foregroundstage.getgutterheight();     foregroundstage.getcamera().translate(-gw,-gh,0);     } 

you use 2 stages, case better solve problem creating 2 groups inside single stage:

stage stage = new stage();  group background = new group(); background.setbounds(0, 0, gdx.graphics.getwidth(), gdx.graphics.getheight()); group foreground = new group(); foreground.setbounds(0, 0, gdx.graphics.getwidth(), gdx.graphics.getheight());  // notice order stage.addactor(background); stage.addactor(foreground);  foreground.addactor(new actor()); // or else want add stage.   background.addactor(new image()); // background image here.  gdx.input.setinputprocessor(stage);