Flammable Freddy, a game made by a Youtuber I regularly watch, runs very poorly with DXVK and runs out of address space. The game is made with a game engine called Clickteam Fusion, I assume other games using it have the same issue.

The problem is that the game heavily relies on D3DLOCK_NOOVERWRITE when uploading data before every draw. The buffer is a vertex buffer in the systemmem pool with the usages D3DUSAGE_WRITEONLY | D3DUSAGE_DYNAMIC. DXVK ignores D3DLOCK_NOOVERWRITE for everything that isn't in D3DPOOL_DEFAULT, so we do a ton of copying and eventually run out of address space.

The game itself isn't really important but it highlights that we still havent gotten the D3DLOCK flags right.

Software information

Flammable Freddy

System information

• GPU: GTX 1070
• Driver: 495.44
• Wine version: 6.21
• DXVK version: 1.9.2 or PR 2364.

Log files

• d3d9.log: Not useful.