Game Boy Window as a Giant Sprite

The original Game Boy (DMG/CGB/etc) is limited to 8x8 and 8x16 sprites, or a larger meta-sprite composed from up to 40 of those smaller, individually managed sprites. There are some workarounds, but generally this limits the maximum size of sprites to a small size on an already small screen.

As an exercise, this demos using the video overlay Window as a huge pseudo-sprite (with some limitations). The priority feature and transparent pixels of regular sprites are used to create some foreground/background layering.

• Star sprites: S_PRIORITY flag set so they appear behind the Window sprite, except where it's pixels are set to color zero.

• Game Boy sprites: S_PRIORITY flag not set so it's above the Window sprite.

• Background layer: All pixels set to color zero.

Built with GBDK - http://gbdk.sourceforge.net/