Vamiga: Shadow of the beast III, graphics glitches

[Alessandro1970]

Hi,
There is a graphic error on the main character of this game that remands me to a precedent bug in winter games or similar:

Archivio 2.zip

[dirkwhoffmann]

Hmm, well, yes, this guy has serious skin problems.

The game really pushes the Amiga hardware to the limit. Hard to spot any free DMA cycle 🤭.

I also think it's an issue with "attached sprites". Like the issue with the skating lady in Winter Games.

[dirkwhoffmann]

I've written two new tests attached5 and attached6 that test thoroughly the AT bit stuff. vAmiga passes both. Hence, I think this is more likely a timing issue (when the AT bit is set or cleared) rather than an issue with sprite drawing itself.

[dirkwhoffmann]

There is also a scrolling issue in one of the middle layers:

So sad that it's buggy yet. It's a really cool game 👍.

[dirkwhoffmann]

Actually, I think the main character looks a bit boring now. I liked him more with the glowing skin. Looked like a superpower to me 😎.

The scrolling bug remains. We need to find out how the game draws the middle layer and come up with a test case isolating the error source.

[dirkwhoffmann]

This article explains the technical details of Shadow of the Beast I.

https://codetapper.com/amiga/sprite-tricks/shadow-of-the-beast/

To find the remaining graphics bug, it might be more fruitful to watch out for simpler intros / demos. The Beast series is the worst we can get w.r.t. technical complexity.

[dirkwhoffmann]

No longer an issue in v0.9.5: