Sonic Adventure 2 - The rotating title logo textures are broken when using DX11

[kihato]

Platform / OS / Hardware: Windows11 / i7-10700F / GTX 1660 SUPER

Github hash: 18f9b84

https://github.com/flyinghead/flycast/assets/14366233/e954b47a-2560-4346-b420-ba39c2357b36

This is related to #1207. The steps to reproduce are as follows.

• Delete dx11oit_shader_cache.bin in advance.
• Launch flycast and select DX11 and per-strip (per-triangle).
• Launch PowerStone and when you see the rotating Capcom logo, pause flycast and switch to per-pixel.
• Once you cancel the pause, return to the game, pause again, and exit PowerStone with Exit.
• Launch Sonic Adventure 2.

This is a demo of Virtua Athlete 2000. This was the only time I was able to reproduce it and I was never able to reproduce it again.

[flyinghead]

Thanks for the detailed steps to reproduce! This is indeed the same issue as #1207 and the root cause is Flycast changing the host CPU rounding mode to match the guest SH4. This affects how dx11 shaders are compiled. So I avoid changing the rounding mode on the UI/render thread and set it to default before calling the renderer in single-threaded mode. Should be fixed in the next master build.

[kihato]

I noticed something about switching from per-strip to per-pixel when using DX11.

Virtua athlete 2000 may look like the image below when switching within the demo. (This is only a momentary flicker.)

In Sonic Adventure 2, if you switch during a scene where stars are displayed across the screen, dots like the image below may appear on the boot logo. (I haven't seen this in any games other than SA2, and I also saw it when using flycast v1.3.)

In any case, there doesn't seem to be any particular problem, so I'll close this issue. Thanks for your quick response.