Maelstrom GBA

Maelstrom for Game Boy Advance
General
Author	Philip Corner
Type	Shooter
Version	1.1
License	Mixed
Last Updated	2005/03/12
Links
Download
Website
Source

A game demo based on Tempest by Dave Theurer.

Tempest is a classic arcade game in which the player is presented with a 3D view down the length of a hollow tunnel. The player controls a ship which is attached to the tunnel's inner surface, and must destroy and evade enemies coming toward them up the tunnel.

User guide

Shoot the enemies coming towards you, and avoid getting hit by them.

Controls

Left/Right - Move around the tunnel

A - Fire (only three shots are available at once)

R/L - Zoom in and out

Screenshots

Online emulator

Can use gamepad or customise in the control settings.

Game Boy Advance	Keyboard

Changelog

V1.1

• Scoring and collision detection with our ship; we can now be destroyed!
• Simple line draw speedup (removing multiplications, adding double pixel draw where appropriate).
• Text system. Storage of symbols and drawing mechanism.
• Collision detection of enemies with us using size of each model involved.
• Backface culling. Finding visibility with dot product.
• Combining some transformation functions to remove unnecessary loops and function calls. For example, combining Translatetunnel() with Rotatetunnel() and Translateenemies() with Transformenemies().
• Placing some time-critical functions into IWRAM (Internal Work RAM) for increased speed (due to zero wait states).

Credits

Programming the Nintendo Gameboy Advance: The Unofficial Guide http://www.jharbour.com/gameboy/

3D Computer Graphics by Alan Watt

Graphics Gems by Andrew S. Glassner

Emanuel Schleussinger for writing HAM

Thanks to all the great people on the HAM forum at: http://www.ngine.de

and also the GbaDev forum at: http://forum.gbadev.org

Dave Theurer for writing Tempest in the first place!

External links

• Author's website - http://www.vertex.ukfsn.org/maelstrom/instructions.html (archived)