I decided to create an own topic for the Drag[en]gine Game Engine decoupled from the OpenGL Mesa Problem Topic with the 1.3 release.
Home Page of the project is locate here: DragonDreams
The full Changelog of the latest release is here (perma-link): Changelog Latest Release
Game development information can be found on the Wiki: Developer Wiki
Source code can be found on GitHub: GitHub Repository
Example projects are on GitHub too: GitHub Examples
And eventually the IndieDB News Article
As with the 1.2 release the Mesa problem is still present. Waiting for the Mesa bump in HaikuPorts. No GUI tools yet under Haiku (no gui-launcher nor IGDE). That comes when I looked closer at the UI API in Haiku.
For HaikuPorts the Pull Request is pending, then you can get it over HaikuPorts.