How to configure for Vulkan?

nikitablack

You need to tell configure where the sdk is. Please read the comment from SGaist.

JoseLMO

@nikitablack How? I don't use QT before.

nikitablack

You need to run configure and pass arguments, for example:

configure -I $VULKAN_SDK/include -L $VULKAN_SDK/lib -v -feature-vulkan

JoseLMO

The bash said:

ERROR: Feature 'vulkan' was enabled, but the pre-condition 'libs.vulkan' failed.

And $VULKAN_SDK is correct folder.

Tadinu

@SGaist Since I tried to run the example project Hello Vulkan Cubes but it just signaled this error:

Failed to load vulkan: Cannot load library vulkan: (vulkan: cannot open shared object file: No such file or directory)
initInstance: No Vulkan library available
Failed to create platform Vulkan instance
Failed to create Vulkan instance: 0

Regarding the latest status of Vulkan feature supporting in the prebuilt version for Linux, do we have it already enabled for Qt 5.15?

Thank you.

SGaist

From your error message do you have the Vulcan dependencies installed on your system ?

Tadinu

Yeap, this is my vulkaninfo command output and I also have VULKAN_SDK set in QtCreator environment variables, thus I could build the example fine, but it just failed at runtime:
https://drive.google.com/file/d/1pd9AGdC88KiN03e7bZzonkifd2jsRlZx/view?usp=sharing
This is my graphics card info:

+-----------------------------------------------------------------------------+
| NVIDIA-SMI 455.26.02    Driver Version: 455.26.02    CUDA Version: 11.1     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  GeForce RTX 208...  Off  | 00000000:01:00.0  On |                  N/A |
| 35%   32C    P8    24W / 260W |   1209MiB / 11016MiB |      6%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|    0   N/A  N/A      2256      G   /usr/lib/xorg/Xorg                568MiB |
|    0   N/A  N/A      2579      G   /usr/bin/gnome-shell              155MiB |
|    0   N/A  N/A      3404      G   ...AAAAAAAAA= --shared-files       88MiB |
|    0   N/A  N/A      3553      G   ...AAAAAAAAA= --shared-files      390MiB |
|    0   N/A  N/A      5623      G   ...s/QtCreator/bin/qtcreator        3MiB |
+-----------------------------------------------------------------------------+

SGaist

What did you install on your system for the Vulkan part ?

Tadinu

I just have the Vulkan SDK in a local folder and install this NVIDIA driver Linux 455.26.02, which supports VK_KHR_ray_tracing extension from this link:
https://developer.nvidia.com/vulkan-driver

SGaist

It would be nice to have more details about the SDK like the version you have, the way you got it and installed it, etc.

Tadinu

Yeah, so my Vulkan SDK version is 1.2.154.0 from their official page:
https://vulkan.lunarg.com/sdk/home#linux

I just extracted to a folder then set VULKAN_SDK to its path.
I actually tried with two of my latest current Linux NVIDIA driver as the proprietary 455 and the Beta one 455.26.2.

So I doubt that in order to run Vulkan examples by Qt, should I install the Vulkan using sudo apt install vulkan-sdk, which I might dread will conflict with the NVIDIA driver. I remember having some bad experience with it.

Pablo J. Rogina

@Tadinu said in How to configure for Vulkan?:

Failed to load vulkan: Cannot load library vulkan: (vulkan: cannot open shared object file: No such file or directory)

Have you try setting updating LD_LIBRARY_PATH variable to reflect the proper location of the Vulkan library(ies)?

Tadinu

Yeah, I would normally avoid updating LD_LIBRARY_PATH. So I added this to ~/QT/Examples/Qt-5.15.1/vulkan/hellovulkancubes/hellovulkancubes.pro file:

LIBS += -lvulkan -L<PATH_TO_VULKAN_SDK>/1.2.154.0/x86_64/lib

And it works!

Thanks for your advice!

JackLiu

I found an interesting piece of information that

-recheck-all

is needed if it has been configured before.