From GameBrew - a wiki dedicated to Video Game Homebrew.
Maelstrom DS is a game demo based on Tempest from Dave Theurer.
The view can be moved by dragging the touch screen. When you do, you'll see that the outside of the tunnel becomes partially transparent to allow you to see all the action!
D-Pad - Move around the tunnel, Zoom in/out
A/L - Fire
Stylus - Move view
X - Switch between manual and automatic view (touching the screen switches to manual)
Select - Toggles invincibility
Can be played on real hardware.
Tested with SuperCard MiniSD and M3 DS Simply.
Thanks must go to everyone who's contributed to DevKitPro and libnds, particularly the people who implemented the pseudo-OpenGL functions which made writing this demo so easy.
A particular thanks must go to Dovoto who converted the NeHe tutorial demos for use on the DS. Some of the initialisation and texture loading code was taken from these demos.