https://fedoraproject.org/wiki/Changes/DXVKwined3d

== Summary == Proposal to replace default wined3d backend with DXVK, A Vulkan-based translation layer for Direct3D 9/10/11 which allows running 3D applications on Linux using Wine.

Currently, wine in Fedora uses wined3d and users can optionally install DXVK (be it wine-dxvk package or by any other means). With this change accepted, wine would use DXVK instead of wined3d on supported GPUs automatically.

== Owner == * Name: [[User:frantisekz| Frantisek Zatloukal]] * Email: fzatlouk@redhat.com

== Detailed Description ==

DXVK is an alternative to wined3d providing more performant and more compatible way to run Windows applications and games using DirectX 9, 10 and 11.

More detailed description is available on [https://github.com/doitsujin/dxvk DXVK Github].

DXVK is available as a wine-dxvk package since Fedora 31. wine-dxvk package uses alternatives system for following wine dll files: d3d9, d3d10.dll and d3d11.dll .

Should this proposal be accepted, [ https://src.fedoraproject.org/rpms/wine-dxvk/pull-request/4# a Pull Request] will be merged into the wine-dxvk package which ensures it gets set as default backend only on systems with Vulkan support. wine-dxvk will then get added as "Recommends: wine-dxvk" into the wine package itself.

Users can run 'dnf reinstall wine-dxvk' after changing hardware configuration to get alternatives to use DXVK or wined3d updated.

This proposal can be accepted in a "reduced form" of replacing the default wined3d backend only for DirectX 10 and 11 and leaving DirectX 9 to be handled by the current wined3d.

== Benefit to Fedora ==

Fedora users running recent Windows games will get superior performance and compatibility. Steam already leverages DXVK but there are other Game Stores and standalone games which would benefit from DXVK. Users had to know about this project and install it manually (or use e.g. Lutris), whereas having DXVK included by default will make sure everybody gets the best possible performance and compatibility.

I haven't done benchmarking per se, there are multiple resources on the Internet comparing DXVK and wined3d. If necessary I will do additional testing on my hardware in the week of July 27th.

== Scope == * Proposal owners: Merge https://src.fedoraproject.org/rpms/wine-dxvk/pull-request/4# ; add Recommends: wine-dxvk into wine the package. * Other developers: N/A (not a System Wide Change) * Release engineering: N/A * Policies and guidelines: N/A (not a System Wide Change) * Trademark approval: N/A (not needed for this Change)

== Upgrade/compatibility impact == The aim is to convert users with supported Hardware Configuration to DXVK as a part of Fedora 32 > Fedora 33 upgrade. There should not be any breakage since postinst script of wine-dxvk package would verify if the GPU supports Vulkan or not and set alternatives to wined3d or DXVK accordingly.

There is a slight possibility of user experience degradation compared to wined3d on old Intel iGPUs supporting just a subset of Vulkan specification (Ivy Bridge and Haswell generations). I haven't had any opportunity to test DXVK on such hardware, however, if issues are discovered, check for Vulkan from wine-dxvk package PR ( https://src.fedoraproject.org/rpms/wine-dxvk/pull-request/4#_1__26 ) could be improved to block certain GPU vendors/generations/models.

AMD and/or nVidia GPUs should not be affected, they either do not support Vulkan at all, or they support it fully.

On GPUs without Vulkan support, wine-dxvk would remain installed and unused, consuming about 167 MB of HDD space. Users would be able to opt-out from using DXVK by adding 'exclude=wine-dxvk*' into /etc/dnf/dnf.conf and removing wine-dxvk package.

== How To Test == 1. Make sure you have Vulkan compatible GPU ('vulkaninfo' runs without errors)

2. Install wine-dxvk package

3. Run some Windows game with wine

A testday will take place before Fedora 33 GA to determine and workaround (disable DXVK and fallback to wined3d) issues on potentially broken hardware and GPU drivers.

In cases when something worked before installing wine-dxvk and stopped after (or regressed), bugs should be reported to [ https://github.com/doitsujin/dxvk/issues DXVK Issue Tracker].

== User Experience == (not provided)

== Dependencies == N/A (not a System Wide Change)

== Contingency Plan == * Contingency mechanism: Obsolete wine-dxvk through base wine package * Contingency deadline: N/A (not a System Wide Change) * Blocks release? No * Blocks product? No

== Documentation == N/A (not a System Wide Change)