Doom64EX Vita is a port of Doom64EX for the PSVITA/PSTV.
Doom64EX is a reverse-engineering project aimed to recreate Doom64 as close as possible with additional modding features.
Requirements
In order to run Doom64EX, you need libshacccg.suprx. If you don't have it installed already, you can install it by following this guide: https://samilops2.gitbook.io/vita-troubleshooting-guide/shader-compiler/extract-libshacccg.suprx

Known Issues
Enabling the Texture Combiner will result in lighting being broken in game. It's suggested to keep it off.
When a lot of sounds are played simultaneously, framerate can hinder a bit (down to 30-40 fps).
Music playback and sounds sometime can go out of sync and/or repeat small chunks (This is due to a bug in fluidsynth).
Default Controls
X = Jump (when enabled in Options)
Start = Pause
Select = Open AutoMap
Up/Down = Zoom In/Out AutoMap
Left/Right = Change Weapon
Triangle/Circle = Change Weapon
L = Run
R = Fire
Square = Activate/Use
Initial Setup
Download Doom64EX.vpk from the Release section and install it.
Download Doom64EX.zip from the Release section and extract it in ux0:data/Doom64EX.
Follow one of the two paragraphs below to install game data files.
Setup from N64 cartridge
This is the indended way to install original Doom64EX.

Dump your own N64 cartridge of Doom 64 (any region works fine) with GameShark, GameGenie or any other source you prefer.
Download wadgen.zip from the Release section.
Run WadGen.exe and select the dump of your Doom 64 cartridge. It will generate the required files for Doom64EX to work.
Copy DOOM64.WAD and DOOMSND.SF2 to ux0:data/Doom64EX.
Setup from Steam
This allows to use Doom 64 remaster WAD with Doom64EX. It will have some minor issues with demo playback but will allow to play also the exclusive The Lost Levels.

Buy the game on Steam.
With a webbrowser, navigate to the url steam://nav/console.
When asked with what to open said link, select Steam.
On Steam, you'll get prompted with the console, input in the console download_depot 1148590 1148591 7293157900876244073.
Steam will start download the depot. Once finished, it will show in the console what path it downloaded it to, navigate towards that directory.
Download the Doom64EX Steam to EX patch made by Henky from this url.
Extract the archive in the same folder of the downloaded depot.
Run run.cmd. It will generate an output folder with the required files for Doom64EX to work.
Copy DOOM64.WAD and DOOMSND.SF2 to ux0:data/Doom64EX.

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