QRhi Device Choose

RSteffen

Hi,
updated my Qt to 6.8 this morning. Runs like a charm.
Now I'd like to choose my QRHI backend device, as I have 2 GPU available. Unfortunately, QRHI grabs the slow first one. Any recommendation how to choose the physical devise for OpenGL, Vulkan, Direct3D and Metal?
Richard

SGaist

Hi,

I am not an expert in that part of Qt but I don't think there is currently such an API.

RSteffen

This is what i found so far,
"void QVulkanWindow::setPhysicalDeviceIndex(int idx)
Requests the usage of the physical device with index idx. The index corresponds to the list returned from availablePhysicalDevices().
By default the first physical device is used."
But thats not what i need.

RSteffen

I was able to switch to the faster GPU device by define in the main.cpp

extern "C" {
_declspec(dllexport) short NvOptimusEnablement = 1;
_declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
}

SGaist

That's indeed highly specific to Vulkan. I was looking for something generic.

That might be a feature request that you could create on the bug tracker.

RSteffen

No, also OpenGL now accept the faster NVidea GPU id=1.
I make a ticket already.

SGaist

Can you post a link to the ticket ? It will make it easier to find for other people looking for a similar functionality.