Added GPU selection

[InfernoAmaruq]

in lovr.conf, t.graphics.selectGPU takes a function and lets you choose what GPU you want lovr to use

Only for Vulkan

usage example for selecting discrete GPU:

-- in lovr.conf
t.graphics.selectGPU = function(gpus)
    for Idx, Device in ipairs(gpus) do
        if Device.discrete then return Idx end
    end
    return 1
end

Has fields: .vendor, .name, .id, .discrete, .renderer
Defaults to GPU at index 1 if no function provided or no return

[bjornbytes]

For this I was thinking of using the t.graphics.lowpower option that LÖVE recently added (true = pick first integrated GPU, false = pick first discrete GPU). Would this work for your use case? It's a little bit less powerful than the implementation here, but on the other hand people might get tired of writing a function to filter GPUs if they just wanted to use the integrated GPU.

[InfernoAmaruq]

Oh that would also be nice. My goal was making it so you can select a specific GPU since sometimes igpu is chosen when a dgpu is present

If lowpower does the same thing then I see it as a win

[bjornbytes]

I guess one other thing to consider is that WebGPU only exposes low-power and high-performance GPU selection, so lowpower could work on WebGPU whereas specific device selection couldn't map onto that.