[d3d9] Flickering rectangles in Starcraft 2 when post-processing is set to ultra.

[Venemo]

I use Lutris to play Starcraft 2. When post-processing is set to ultra, some strange flickering rectangles appear on the screen.

Software information

• Fedora 34, Gnome 40.4, mesa 21.1.8
• Starcraft 2

System information

• GPU: AMD RX 6900XT
• Driver: RADV (mesa 21.1.8)
• Wine version: lutris-fshack-6.14-4-x86_64
• DXVK version: 1.9.2L

Apitrace file(s)

• Put a link here

Log files

• d3d9.log: SC2_x64_d3d9.log
• d3d11.log: N/A
• dxgi.log: SC2_x64_dxgi.log

[doitsujin]

Does this happen with PR #2294 as well?

[K0bin]

Might be a driver bug.

[Venemo]

According to the discussion on Discord, this is the "good old sampling from render target issue", which is going to be solved by VK_VALVE_attachment_feedback_loop_layout in the future.

[Venemo]

A possible workaround until then is to use RADV_DEBUG=nodcc or simply not to use ultra settings in the game.

[Blisto91]

The earliest radv driver i was able to get working was 21.2.5 (If i remember correctly) and i wasn't able to reproduce this. This was on a R9 380, dxvk 1.9.2 (used along with proton 7.0-2) and with ultra/extreme graphics (also post processing). Unless a game update got rid of it or a driver update fixed it then it might be card/gen specific issue.

Edit: i peeked at the discord talk, but i don't understand much of it except the agreement was that a new extension was needed hehe. 😁 So maybe i'm missing something obvious.

[Venemo]

@Joshua-Ashton Can you confirm that the "good old sampling from render target issue" was solved? This was about VK_VALVE_attachment_feedback_loop_layout as far as I remember.

[Venemo]

Or maybe the reworked float emulation has fixed this?

[DadSchoorse]

Yes this is about feedback loops. It's only an issue in practice on GFX10+(rdna/rdna2) because dxvk's current feedback hazard detection uses VK_IMAGE_LAYOUT_GENERAL, which causes dcc decompression on older gpus. So it makes sense that @Blisto91 can't reproduce the issue on GFX8.

[doitsujin]

Should be fixed with attachment_feedback_loop_layout.