SpriteShootout - Mapped naive

protected void animate(
    final Sprite sprite,
    final SpriteRender spriteRender,
    final int ballSize, final int ballIndex, final int batchSize, final int delta
) {
    final float ballRadius = ballSize * 0.5f;
    final float boundW = SCREEN_WIDTH - ballRadius;
    final float boundH = SCREEN_HEIGHT - ballRadius;

    final Sprite[] sprites = sprite.asArray();
    final SpriteRender[] spritesRender = spriteRender.asArray();
    for ( int b = ballIndex, r = 0, len = (ballIndex + batchSize); b < len; b++, r++ ) {
        float x = sprites[b].x;
        float dx = sprites[b].dx;

        x += dx * delta;
        if ( x < ballRadius ) {
            x = ballRadius;
            sprites[b].dx = -dx;
        } else if ( x > boundW ) {
            x = boundW;
            sprites[b].dx = -dx;
        }
        sprites[b].x = x;

        float y = sprites[b].y;
        float dy = sprites[b].dy;

        y += dy * delta;
        if ( y < ballRadius ) {
            y = ballRadius;
            sprites[b].dy = -dy;
        } else if ( y > boundH ) {
            y = boundH;
            sprites[b].dy = -dy;
        }
        sprites[b].y = y;

        spritesRender[r].x = x;
        spritesRender[r].y = y;
    }

}