DXVK-NVAPI 0.9.3 adds Opacity Micromaps, Reflex rework for Proton ray-tracing

DXVK-NVAPI 0.9.3 released this weekend with substantial improvements for Linux gamers running Windows titles through Proton on NVIDIA hardware. The update introduces support for Opacity Micromaps (OMM), a DXR 1.2+ feature that accelerates ray-tracing through alpha-tested and semi-transparent geometry when paired with NVIDIA's R615 Linux driver and VKD3D-Proton 3.1. The release also reworks NVIDIA Reflex latency reduction for Vulkan games to use the VK_NV_low_latency revision 2 extension directly, eliminating the need for the DXVK-NVAPI Vulkan layer entirely.

Additional changes include expanded driver setting support for R610 and R615 series drivers, more accurate reporting of available and free VRAM, and new ARM64 compilation targets. DXVK-NVAPI serves as the bridge between NVIDIA's proprietary NVAPI and Linux graphics APIs, translating Windows game calls into Vulkan equivalents that Proton can execute natively.

Graphics layer and driver changes in DXVK-NVAPI 0.9.3

• Opacity Micromaps (DXR 1.2+): New NVAPI implementation exposes Microsoft's OMM feature for ray-tracing acceleration through alpha-tested geometry, requiring NVIDIA R615+ drivers and VKD3D-Proton 3.1.
• NVIDIA Reflex rework: Alternative implementation targets VK_NV_low_latency revision 2 directly for Vulkan games, making the previous DXVK-NVAPI Vulkan intermediary layer obsolete.
• Driver compatibility: Added support for new settings introduced in NVIDIA R610 and R615 driver branches, keeping pace with NVIDIA's recent Linux driver releases.
• VRAM reporting: Improved accuracy of available and free video memory reporting to Windows games running under Proton.
• ARM64 support: Build system now supports compiling for ARM64 architectures, expanding platform coverage beyond x86_64.

Why it matters

For Steam Deck competitors and ARM64 Linux handhelds in development, the new compilation target broadens DXVK-NVAPI's hardware reach. The Reflex layer removal simplifies the Proton graphics stack and may reduce latency overhead for competitive gaming on Linux, while OMM support closes a ray-tracing feature gap that has limited visual parity between Windows and Proton for NVIDIA users.