because it's half-life's 25th anniversary i compiled xash3d-fwgs and hlsdk on my A311D MNT Reform and what can i say, the performance is spectacular, much better than emulating x86+windows :D
some hints:
- i needed to rename hl.so to hl_arm64.so and client.so to client_arm64.so.
- got the game files from half life game of the year edition ISO which i first installed via wine+box86 (yield's "valve" folder)
- probably easier if you have working Steam somewhere and can get the game files from there (?)