Running Bastion on VisionFive 2 about box64

[xctan]

Tested and have the same issue in qemu-user. By bisecting commits, the culprit is 93abd016 and I plan to fix it.

[xctan]

@ptitSeb, Bastion now works without rotation.

[ptitSeb]

Wow, that is really odd!
Yeah, gl4es should support bastion (but I haven't tried it for a long time). I need to check on an ARM device if it runs fine also.

[xctan]

Detailed examination reveils that this game is using x87 FSIN and FCOS to calculate sin() and cos(). FSTP is used to retrieve the result from x87 regs, which is implemented in the above commit and happens to trigger a bug in JIT'ed trigonometric functions, so everything coincidentally rotates 45 degrees.

[ptitSeb]

Ok, I found some issue with a few x87 helper function. I haven't tested Bastion yet, but I guess it should help. Can you try with latest sources?

[ksco]

Wow, nice. I’m still on my vacation, I’ll try it later today.

[ksco]

Does the gameplay works also? It failed with some errors directly displayed on the game window before the fix.

[xctan]

Gameplay works at around 14 fps.

[ksco]

Great, I’ll try on VF2 later. And we’re now have another test target, seems a lot of opcodes are missing for this game.

[ksco]

It works on VF2 also (gameplay fps is under 10), but in full-screen mode, the screen will jump and flicker, not sure what the issue is.

[ptitSeb]

It can be a gl4es issue.

[ksco]

It can be a gl4es issue.

Yeah, probably. @xctan did you try full-screen on your qemu-user setup? Is it function well?

[xctan]

This game runs in full-screen (by default) without any glitch on my setup.

[ksco]

Then it probably is a gl4es issue.