CNCD - Inside : rendering errors

[sarah-walker-pcem]

Describe the bug
Numerous rendering errors running Inside by CNCD. Geometry glitches are frequent, there are also what look like palette related issues. These may be two separate bugs.

While issues are seen with both the interpreter and recompiler, they seem more prominent with the interpreter. The geometry issues may be an FPU issue.

To Reproduce
Steps to reproduce the behavior:

1. Run Inside
2. Observe visual issues

Expected behavior
The demo running without visual glitches

Screenshots

Emulator configuration

• Machine: AMI 486 clone
• CPU: i486DX2/66
• Graphics/sound cards: Diamond Stealth 32, Sound Blaster 2.0
• Installed OS: MS-DOS 6.22

Host machine

• OS: Windows 10
• Emulator version: v17

[sarah-walker-pcem]

FPU state is getting corrupted during interrupts. Looks like FSTENV isn't saving the correct top-of-stack value.

[sarah-walker-pcem]

Fixed in commit 51516c0.