This has finally been officially released on the Play Store under the name DIII4A! And it is still free to download! You can download it from the follow link: https://play.google.com/store/apps/details?id=com.n0n3m4.DIII4A&hl=en
This new release does not have much for an increase in performance, but it does have a simplified installation. The gl2progs folder is no longer needed as the app installs it and the configuration files are also not really needed, but can still be used for more advanced tweaking. There are also new options to use ETC1 compression and cache, but I would recommend leaving those off as it increased loading times for me and also reduced performance by a little bit.
This game runs great on my Nexus 4 and other high-end devices! Playing with the onscreen controls is obviously not very good, but if you have a PS3 controller lying around you can get it to work perfectly with it using the Sixaxis Controller app. Just make sure to set it up to emulate a mouse and choose enable mouse in the app's control options (requires root). Purchase a GameKlip too for the ultimate gaming experience on the go! Mouse and keyboard also work great through either bluetooth or USB OTG.
1) Install Doom 3 on your PC and make sure it is updated to the latest version which is 1.3.1.
2) Copy over the base folder from the Doom 3 installation on your PC to your phone into a folder called diii4a. You can change the folder name if you like, just make sure you point the app to the new folder and you CANNOT put spaces in the folder name.
3) Install the app. The latest version is currently v1.1.
4) Start it up and you should have this amazing game running on your phone or tablet. Network features also work and you can even play games with people playing on PC! Here is a YouTube video showing this in action: http://www.youtube.com/watch?v=sN26X93NUno
Thanks to InsaneNutter for pointing this out!
Also, if you're running it on an older device and the fps are too low, you can disable all the lighting effects by just selecting the "Disable lighting" option at the main menu of the app. The game will run MUCH smoother.
Here is a great step-by-step video tutorial by RolandDeschain79 that also shows some gameplay comparisons between having the lighting enabled and disabled on his Note 2. Thanks man!
This is the Russian thread where it originally came from: http://4pda.ru/forum/index.php?showtopic=330329