There is a Khronos OpenGL ES driver for RISC OS for Raspberry Pi 3 that was compiled by Chris Gardensen or Lee Noa.

Download Khronos driver for Raspberry Pi 3 from https://www.riscosports.co.uk/raspberrypi

Here the sources managed by Lee Noa
Link http://www.riscos.info/websvn/listing.php?repname=gccsdk

ROOL forum post about the Khronos driver
https://www.riscosopen.org/forum/forums/...435?page=1

Currently there seems to be no Raspberry Pi 4 version as it used another GPU than the Raspberry Pi 3.
Here is another open source GPU driver for VideoCore IV which can be found in the Raspberry Zero up to Pi 3B. But this one is not ported to RISC OS.
https://github.com/Yours3lf/rpi-vk-driver
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3D games working with the Khronos driver on Raspberry Pi 3:
[url=http://www.riscosports.co.uk/vfp/neverball.zip]Neverball (Open Source) http://www.riscosports.co.uk/vfp/neverball.zip

Image from portableapps.com

Neverput (open source) compiled by Lee Noa
Same download link as the Neverball Zip but you must rename the file started by !Run
Neverput (Open Source) http://www.riscosports.co.uk/vfp/neverball.zip

Image from appsonwindows.com

Quake DarkPlaces
Quake Darkplaces Download https://www.riscosports.co.uk/raspberrypi/


More screenshots at https://icculus.org/twilight/darkplaces

Vice is the Versatile Commodore Emultor.
The current version emulates the C64, the C64DTV, the C128, the VIC20, practically all PET models, the PLUS4 and the CBM-II (aka C610/C510).
Lastest version is 3.5. There is a version compiled by Chris Gardensen www.riscosports.co.uk/emulation but it is version 2.2 from 2012.

We are looking for someone to compile the latest version.

Jason Tribbeck has volunteered to write or upgrade the RISC OS audio system.
The primary goals are to:

1. Allow audio input
   
2. Support multiple interfaces at the same time
   
3. Have higher resolution formats
   
4. Provide backward compatibility with what has been done before
   

A 3D driver is a nice thing but without any software that uses it is pretty useless also.
So the goal is to create as many 3D apllications as possible to promote the new 3D capabilities of RISC OS.

Minecraft is a very popular game which itself is not open source. But there are multiple open source game projects that copy the idea of Minecfraft.

Might you be interested to port a 3D open source game to RISC OS?
https://www.michaelfogleman.com/projects/craft/
http://www.minetest.net/

For minetest exist many existing complete Games data:
https://content.minetest.net/
https://github.com/minetest/minetest/issues

If you are interest more into any other 3D open source game or maybe even an original RISC OS 3D games feel free to contact us to create a Forum for your game or software that you want to work on. Or doing a cool 3D demo ?