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From wikipedia:Vulkan (API):

  Vulkan is a low-overhead, cross-platform 3D graphics and compute API. First released in 2016, it is a successor to OpenGL.

Learn more at Khronos.

## Installation

Note: On hybrid graphics (NVIDIA Optimus/AMD Dynamic Switchable Graphics):

- Vulkan is not currently officially supported by Bumblebee [1] but does work with primus_vk or primus-vk-gitAUR.
- The Radeon Vulkan driver now supports PRIME [2].

To run a Vulkan application, you will need to install the vulkan-icd-loader package (and lib32-vulkan-icd-loader if you also want to run 32-bit applications), as well as Vulkan drivers for your graphics card(s). There are several packages providing a vulkan-driver:

- Intel: vulkan-intel (or lib32-vulkan-intel)
- NVIDIA: nvidia-utils (or lib32-nvidia-utils)
- AMD: there are three implementations, which could be installed simultaneously:
  - vulkan-radeon (or lib32-vulkan-radeon) - RADV (part of Mesa project)
  - amdvlk (or lib32-amdvlk) - AMDVLK Open (maintained by AMD)
  - vulkan-amdgpu-proAUR (or lib32-vulkan-amdgpu-proAUR) - AMDVLK Closed (maintained by AMD)

The following are software rasterisers, so that you can use it on devices that do not provide Vulkan support.

- Lavapipe: vulkan-swrast (or lib32-vulkan-swrast)
- SwiftShader: swiftshader-gitAUR

For Vulkan application development, install vulkan-headers, and optionally vulkan-validation-layers and vulkan-tools (you can find the vulkaninfo tool in here).

## Verification

To see which Vulkan implementations are currently installed on your system, use the following command:

    $ ls /usr/share/vulkan/icd.d/

To ensure that Vulkan is working with your hardware, install vulkan-tools and use the `vulkaninfo` command to pull up relevant information about your system. If you get info about your graphics card, you will know that Vulkan is working.

    $ vulkaninfo

### Switching between AMD drivers

On AMD systems, it is valid to have multiple Vulkan drivers installed at once, and it may be desirable to switch between them.

#### Selecting via environment variable

Note: This method does not support selecting the AMDVLK Closed drivers.

As of amdvlk 2021.Q3.4, a new switching logic was implemented which enforces AMDVLK as the default and mandates you either

- set `AMD_VULKAN_ICD=RADV` to switch from the AMDVLK default,
- or globally set `DISABLE_LAYER_AMD_SWITCHABLE_GRAPHICS_1=1` to re-enable the ICD loader method below.

When `DISABLE_LAYER_AMD_SWITCHABLE_GRAPHICS_1=1`, you can choose your preferred driver by setting the environment variable `VK_ICD_FILENAMES`. For example, running Steam with the RADV driver is done by

    $ VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/radeon_icd.i686.json:/usr/share/vulkan/icd.d/radeon_icd.x86_64.json steam

To avoid crashes with 32-bit games, it is possible to assign the 32-bit variant and the 64-bit variant to the environment variable.

#### Selecting via AMD Vulkan Prefixes

AMD Vulkan Prefixes is a script for switching between all three Vulkan implementations. Install amd-vulkan-prefixesAUR, and prepend your application with the prefix you want. The executables provided are `vk_radv`, `vk_amdvlk`, and `vk_pro`. For example, to use the AMDVLK Closed drivers:

    $ vk_pro command

## Software Vulkan: lavapipe

You can also install the software Vulkan rasterizer known as lavapipe: vulkan-swrast (or lib32-vulkan-swrast for the 32-bit version).

    $ LIBGL_ALWAYS_SOFTWARE=1 __GLX_VENDOR_LIBRARY_NAME=mesa VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/lvp_icd.i686.json:/usr/share/vulkan/icd.d/lvp_icd.x86_64.json vulkaninfo

## Vulkan hardware database

The Vulkan Hardware Database provides user reported GPU/driver combinations. Supplying own information is possible by using vulkan-caps-viewer-waylandAUR or vulkan-caps-viewer-x11AUR.

## Troubleshooting

### NVIDIA - vulkan is not working and can not initialize

Check if you have any other vulkan driver installed, it may prevent NVIDIA's vulkan driver from being detected.

Alternatively set the environment variable `VK_ICD_FILENAMES` to `/usr/share/vulkan/icd.d/nvidia_icd.json`.

If you have a dual-graphics system, like NVIDIA Optimus, ensure that your system is using the graphics card that you installed Vulkan drivers for.

This article or section needs expansion.

Reason: optimus-manager is just one of several utilities for NVIDIA Optimus. (Discuss in Talk:Vulkan)

This article or section needs language, wiki syntax or style improvements. See Help:Style for reference.

Reason: Command in code block requires a prompt symbol. (Discuss in Talk:Vulkan)

    optimus-manager --status

    Optimus Manager (Client) version 1.4

    Current GPU mode : nvidia
    GPU mode requested for next login : no change
    GPU at startup : integrated
    Temporary config path: no

### No device for the display GPU found. Are the intel-mesa drivers installed?

Try to list both the intel_icd and primus_vk_wrapper configurations in VK_ICD_FILENAMES

    export VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/intel_icd.x86_64.json:/usr/share/vulkan/icd.d/nv_vulkan_wrapper.json

### AMDGPU - ERROR_INITIALIZATION_FAILED after vulkaninfo

If after running `vulkaninfo` on AMD card from GCN1 or GCN2 family you got error message like:

    ERROR at /build/vulkan-tools/src/Vulkan-Tools-1.2.135/vulkaninfo/vulkaninfo.h:240:vkEnumerateInstanceExtensionProperties failed with ERROR_INITIALIZATION_FAILED

Then check if you have correctly enable support for this models of graphics cards (AMDGPU#Enable Southern Islands (SI) and Sea Islands (CIK) support).

One of possibility to check if gpu drivers are correctly loaded is `lspci -k`, after running this command check kernel driver of your gpu. It should be `amdgpu`.

    $ lspci -k

    ...
    01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Curacao PRO [Radeon R7 370 / R9 270/370 OEM]
    	Subsystem: Gigabyte Technology Co., Ltd Device 226c
    	Kernel driver in use: amdgpu
    	Kernel modules: radeon, amdgpu
    ...

Some forum threads about this problem: [3] [4]

### AMDGPU - Hangs when playing DirectX Vulkan games

Radeon-Vulkan seems to cause driver and/or GPU hangs when playing some games with usage of DirectX Vulkan.

    kernel: [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] *ERROR* Waiting for fences timed out!
    kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx_0.0.0 timeout, signaled ..., emitted ...
    kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information: process ... pid ... thread dxvk-submit pid
    ...

Switching to or enabling AMDVLK seems to fix the problem as discovered in BBS#275991.

### AMDGPU - Crashes with DirectX Vulkan games

AMDVLK has been reported as causing crashes by multiple users (see BBS#284118, BBS#283008, BBS#274737): switching to or enabling the Radeon-Vulkan driver fixes the issue.

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- Graphics
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