Alternative NVAPI implementation on top of DXVK
This repository provides an alternative implementation of NVIDIA's NVAPI library for usage with DXVK and VKD3D-Proton. Its way of working is similar to DXVK-AGS, but adjusted and enhanced for NVAPI.
This implementation currently offers entry points for supporting the following features in applications:
- NVIDIA DLSS for Vulkan, by supporting the relevant adapter information by querying from Vulkan.
- NVIDIA DLSS for D3D11 and D3D12, by querying from Vulkan and forwarding the relevant calls into DXVK / VKD3D-Proton.
- NVIDIA Reflex, by forwarding the relevant calls into either DXVK / VKD3D-Proton or LatencyFleX.
- Several NVAPI D3D11 extensions, among others
SetDepthBoundsTest
andUAVOverlap
, by forwarding the relevant calls into DXVK. - NVIDIA PhysX, by supporting entry points for querying PhysX capabilities.
- Several GPU topology related methods for adapter and display information, by querying from DXVK and Vulkan.
Note that DXVK-NVAPI does not implement DLSS, Reflex or PhysX. It mostly forwards the relevant calls.
While originally being developed for usage with Unreal Engine 4, most notably for Assetto Corsa Competizione
, more entry points have been added over time for enabling other NVIDIA related technologies. DXVK-NVAPI does not and will never cover the complete surface of NVIDIA's NVAPI. It is not meant as a full replacement, but rather as an addition to DXVK and VKD3D-Proton to enable several GPU features.
This implementation is supposed to be used on Linux using Wine or derivatives like Proton. Usage on Windows is discouraged. Please do not replace nvapi.dll
/nvapi64.dll
on Windows from NVIDIA's driver package with this version. DXVK-NVAPI uses several DXVK and VKD3D-Proton extension points, thus using DXVK (D3D11 and DXGI) is a requirement. Using Wine's D3D11 or DXGI implementation will fail. Usage of DXVK-NVAPI is not restricted to NVIDIA GPUs, though the default behavior is to skip GPUs not running the NVIDIA proprietary driver or Mesa NVK. Some entry points offer no functionality or make no sense when a different GPU vendor is detected. DLSS requires an NVIDIA GPU, Turing or newer, running the proprietary driver.
When available, DXVK-NVAPI uses NVIDIA's NVML management library to query temperature, utilization and others for NVIDIA GPUs. See wine-nvml how to add NVML support to Wine/Proton.
Like DXVK, this library is being built as a Windows DLL using MinGW. DXVK-NVAPI requires MinGW-w64 compiler and headers version 9 or newer, the Meson build system at least version 0.58 and Python 3 (needed for a prebuild validation script). This project uses git submodules. Ensure to fetch the submodules while or after cloning the repository, e.g. with git clone --recurse-submodules [email protected]:jp7677/dxvk-nvapi.git
.
Run:
./package-release.sh master /your/path [--enable-tests]
Alternatively DXVK-Docker provides a way for a build setup using docker/podman. Prebuilt binaries of release versions are available at https://github.com/jp7677/dxvk-nvapi/releases. GitHub Actions is set up for building development snapshots.
Support for DXVK-NVAPI has been added to popular game launchers. See their respective documentation for usage and updates of DXVK-NVAPI.
Proton 9.0 includes DXVK-NVAPI and enables it by default for all titles with a few exceptions. Proton 9.0 can force-enable DXVK-NVAPI for titles that have DXVK-NVAPI disabled by default and also for non-NVIDIA GPUs when setting PROTON_FORCE_NVAPI=1
. Contrary, PROTON_DISABLE_NVAPI
disables DXVK-NVAPI.
- Copy and replace
nvapi.dll
/nvapi64.dll
into thedist/lib/wine/nvapi
/dist/lib64/wine/nvapi
folder of your Proton installation, e.g. in~/.steam/steam/steamapps/common/Proton 9.0/
for manually updating the included version.
Proton Experimental Bleeding Edge additionally always contains the latest DXVK-NVAPI development (master) version.
Proton 8.0 includes DXVK-NVAPI and enables it by default for a lot of titles. Use PROTON_ENABLE_NVAPI=1
for that version as game launch argument in Steam to enable DXVK-NVAPI for other titles.
Wine does not includes DXVK-NVAPI.
- Copy
nvapi.dll
/nvapi64.dll
into thesyswow64
/system32
folder of your x86/x64 Wine prefix. - Ensure that Wine uses the native version of
nvapi
/nvapi64
, e.g. withWINEDLLOVERRIDES=nvapi,nvapi64=n
. This applies only to Wine versions that ship their own NVAPI implementation, e.g. Wine-Staging older than 7.22. Generally this is no longer needed nowadays. - Ensure that DXVK is installed in your x86/x64 Wine prefix.
- Ensure that Wine uses DXVK's
dxgi.dll
, e.g. withWINEDLLOVERRIDES=dxgi=n
. - Set
DXVK_ENABLE_NVAPI=1
to disable DXVK'snvapiHack
in DXVK.
DXVK 1.10 and older does not support DXVK_ENABLE_NVAPI
. Disable the nvapiHack
in DXVK 1.10 and older with dxgi.nvapiHack = False
set in a DXVK configuration file, see dxvk.conf.
Using DXVK-NVAPI with other GPU vendors / drivers has very limited use. Outside of testing, only Reflex (LatencyFlex) or HDR entry points provide benefits. This requires DXVK to see the GPU as an NVIDIA GPU. Use DXVK_CONFIG="dxgi.hideAmdGpu = True"
to spoof an AMD GPU as NVIDIA GPU. Use DXVK_CONFIG="dxgi.customVendorId = 10de"
for generally spoofing an NVIDIA GPU.
Setting DXVK_NVAPI_ALLOW_OTHER_DRIVERS=1
is needed for successful DXVK-NVAPI initialization when using a driver other than the NVIDIA proprietary driver or Mesa NVK. The reported driver version on drivers other than the NVIDIA proprietary driver will be 999.99. Overriding the reported driver version is still recommended. The reported GPU arrchitecture for other vendors is always Pascal to prevent attempts to initialize DLSS. This behavior cannot be changed without modifying the source code.
See the DXVK-NVAPI Wiki for common issues and workarounds.
The following environment variables tweak DXVK-NVAPI's runtime behavior:
DXVK_NVAPI_DRIVER_VERSION
lets you override the reported driver version. Valid values are numbers between 100 and 99999. Use e.g.DXVK_NVAPI_DRIVER_VERSION=47141
to report driver version471.41
.DXVK_NVAPI_ALLOW_OTHER_DRIVERS
, when set to1
, allows DXVK-NVAPI to initialize for a non-NVIDIA GPU.DXVK_NVAPI_GPU_ARCH
, when set to one of supported NVIDIA GPU architecture IDs will override reported GPU architecture. Currently supported values are:GK100
(Kepler)GM200
(Maxwell)GP100
(Pascal)GV100
(Volta)TU100
(Turing)GA100
(Ampere)AD100
(Ada)
DXVK_NVAPI_LOG_LEVEL
set toinfo
prints log statements. The default behavior omits any logging. Please fill an issue if using log serveryinfo
creates log spam. Setting severity totrace
logs all entry points enter and exits, this has a severe effect on performance. All other log levels will be interpreted asnone
.DXVK_NVAPI_LOG_PATH
enables file logging additionally to console output and sets the path where the log filedxvk-nvapi.log
should be written to. Log statements are appended to an existing file. Please remove this file once in a while to prevent excessive grow. This requiresDXVK_NVAPI_LOG_LEVEL
set toinfo
.
This project provides a test suite. Run the package script with --enable-tests
(see above) to build nvapi64-tests.exe
. Running the tests executable without arguments queries the local system and provides system information about visible GPUs:
DXVK_LOG_LEVEL=none WINEDEBUG=-all WINEDLLOVERRIDES=dxgi,nvapi64=n wine nvapi64-tests.exe
The test executable also runs on Windows against NVIDIA's nvapi64.dll
. Ensure that DXVK-NVAPI's nvapi64.dll
is not present in the current PATH
for this scenario.
The actual unit tests can be run with nvapi64-tests.exe [@unit-tests]
to validate DXVK-NVAPI's internal implementation.
Producing a debug build and starting a debugging session with the test suite can be achieved with the following snippet:
meson setup --cross-file "./build-win64.txt" --buildtype "debugoptimized" -Denable_tests=True build
meson compile -C build
DXVK_LOG_LEVEL=none DXVK_NVAPI_LOG_LEVEL=none WINEDEBUG=-all WINEDLLOVERRIDES=nvapi64=n WINEPATH=build/src winedbg --gdb build/tests/nvapi64-tests.exe [@all]
Once the debug session has started, use c
to start/continue execution and a.o. bt
to show a proper stacktrace after a segmentation fault. Ensure to have no other native nvapi64.dll
in the Wine prefix, otherwise this one gets precedence over the one found in WINEPATH
.
Many thanks to the corresponding authors!