Super Jumper: A 2D OpenGLES Game - Beginning Android Games - page 483

public void renderBackground() {
batcher.beginBatch(Assets. background );
batcher.drawSprite(cam.position.x, cam.position.y,
FRUSTUM _ WIDTH , FRUSTUM _ HEIGHT ,
Assets. backgroundRegion );
batcher.endBatch();
}
The renderBackground() method simply renders the background so that it follows the camera. It
does not scroll but instead is always rendered so that it fills the complete screen. We also don't
use any blending for rendering the background, so that we can squeeze out a little bit more
performance.
public void renderObjects() {
GL10 gl = glGraphics.getGL();
gl.glEnable(GL10. GL _ BLEND );
gl.glBlendFunc(GL10. GL _ SRC _ ALPHA , GL10. GL _ ONE _ MINUS _ SRC _ ALPHA );
batcher.beginBatch(Assets. items );
renderBob();
renderPlatforms();
renderItems();
renderSquirrels();
renderCastle();
batcher.endBatch();
gl.glDisable(GL10. GL _ BLEND );
}
The renderObjects() method is responsible for rendering the second batch. This time we use
blending, as all our objects have transparent background pixels. All the objects are rendered in
a single batch. Looking back at the constructor of GameScreen , we see that the SpriteBatcher
we use can cope with 1,000 sprites in a single batch—more than enough for our world. For each
object type, we have a separate rendering method.
private void renderBob() {
TextureRegion keyFrame;
switch (world.bob.state) {
case Bob. BOB _ STATE _ FALL :
keyFrame = Assets. bobFall .getKeyFrame(world.bob.stateTime,
Animation. ANIMATION _ LOOPING );
break ;
case Bob. BOB _ STATE _ JUMP :
keyFrame = Assets. bobJump .getKeyFrame(world.bob.stateTime,
Animation. ANIMATION _ LOOPING );
break ;
case Bob. BOB _ STATE _ HIT :
default :
keyFrame = Assets. bobHit ;
}