Switch GPU with code?

[hechelion]

Hi.
it is possible through code, determine which GPU a game should use?

Many laptops use 2 GPUs (integrated intel and dedicated nvidia for example).

If I run a game as "factorio", the laptop automatically knows to run that game with the Nvidia GPU.
On the contrary, if I have a game programmed with SFML, when it runs, it does so with the integrated GPU.

I know it is possible to change this manually in the Nvidia settings, but I would like to know if there is any way to select the GPU automatically. when creating videomode maybe?

[eXpl0it3r]

You can't explicitly pick it, but you can place a hint, that your application should prefer the discrete GPU by setting the macro SFML_DEFINE_DISCRETE_GPU_PREFERENCE .

See here: https://www.sfml-dev.org/documentation/2.5.1/GpuPreference_8hpp.php

[hechelion]

Thank you very much for your answer.
I've been trying to activate the macro in VB NET for a while but without success.
Will you have an example to guide me?

[eXpl0it3r]

Not sure you can really do that out of VB.Net, in that case it's probably easier to export the two fields yourself, but I don't know how this is really done in VB.Net

extern "C" __declspec(dllexport) unsigned long NvOptimusEnablement = 1;
extern "C" __declspec(dllexport) unsigned long AmdPowerXpressRequestHighPerformance = 1;

[hechelion]

I'm going to see if I can implement it in VB, but I will save that code for my next project. I will do with code and C #.

Thanks very much.