Linux DirectX 12 translation layer adds FSR4 and Anti-Lag support, while DLSS4 still lacks native Proton integration
VKD3D-Proton, the Vulkan-to-DirectX 12 translation layer used in Valve’s Proton, has reached version 3.0. The update adds AMD FidelityFX Super Resolution 4 (FSR4) and AMD Anti-Lag support for DirectX 12 games on Linux, while DLSS4 still has no native Proton integration. Proton itself is Valve’s compatibility layer that lets Windows games run on Linux and SteamOS, including Steam Deck.
FSR4 is the main focus of this release. The official build exposes FSR4 only when VK_KHR_shader_float8 is available, which currently limits native support to RDNA 4 based Radeon RX 9000 series GPUs. For older GPUs , there is an optional emulation path using int8 and float16 cooperative matrices. It runs slower and is not enabled by default, so users must build VKD3D-Proton from source with specific flags to get it. I supposed someone will do it eventually.
Source: Github
Linux users with RDNA 4 hardware can expect FSR4 in DirectX 12 titles once Proton ships a build with VKD3D-Proton 3.0. For non-RDNA 4 GPUs, FSR4 remains experimental and aimed at advanced users running custom builds, while DLSS4 still depends on per-game support and manual tweaks.
Interestingly, developers alsonoted that this version also brings experimental support for D3D12 Work Graphs. They note that there are no games that use this technology yet, but based on their testing of it, it already runs faster than native implementation after converting it to normal compute shaders.
Source: VKD3D-Proton
