A reimplementation of the DOOM engine for the Sega Saturn console built around the Jo engine.

The Sega Saturn recieved an official port of DOOM which suffered from a very low frame rate. The hardware appears well-suited to the mixure of pseudo-3D and sprite based rendering but the developer was instructed to perform a straight up port of the game without using VDP1 and VDP2's custom 3D video acceleration, relying on software rendering on the two SH-2 processors instead. As an exercise in exploring the Saturn's hardware I feel performing a similar port - one which will make greater use of the graphics hardware - would be the best way to get hands on experience with the platform. With a little luck, we may even get some playable levels out of the project. :)

In an act that was unusually enlightened for the time, id software released the source code for DOOM. As a result there are many in-depth resources, including the source code for numerous other ports, which elucidate how the DOOM engine works. A few which I've found especially useful for this effort are:

• Fabien Sanglard's excellent website
• Fabien Sanglard's even more excellent book dedicated specifically to the DOOM engine
• The original DOOM source code
• Michael Abrash's book The Zen of Graphics Programming
• The decompiled and annotated PSX source code

1. Install the Jo engine SDK and checkout this code under its Projects directory.
2. Add the PSX DOOM WAD content to the cd directory.
3. Run the compile.sh script.