list-windows-gpu.rs

use std::{ffi::OsString, ptr};

use eyre::ensure;

#[cfg(windows)]
fn main() -> eyre::Result<()> {
    use std::os::windows::ffi::OsStringExt as _;

    use winapi::{
        ctypes::c_void,
        shared::{
            dxgi::{CreateDXGIFactory, IDXGIAdapter, IDXGIFactory, DXGI_ADAPTER_DESC},
            winerror::DXGI_ERROR_NOT_FOUND,
        },
        Interface as _,
    };

    macro_rules! try_hresult {
        ($result:expr) => {{
            let result = $result;
            ensure!(result == 0, "result={result}");
        }};
    }

    unsafe {
        let mut factory = ptr::null_mut::<IDXGIFactory>();
        let uuid = IDXGIFactory::uuidof();
        try_hresult!(CreateDXGIFactory(
            ptr::addr_of!(uuid),
            ptr::addr_of_mut!(factory) as *mut *mut c_void,
        ));
        let factory = &mut *factory;
        let mut i = 0;
        loop {
            let mut adapter = ptr::null_mut::<IDXGIAdapter>();
            let result = factory.EnumAdapters(i, ptr::addr_of_mut!(adapter));
            if result == DXGI_ERROR_NOT_FOUND {
                break Ok(());
            }
            try_hresult!(result);
            let adapter = &mut *adapter;
            let mut desc = DXGI_ADAPTER_DESC::default();
            try_hresult!(adapter.GetDesc(ptr::addr_of_mut!(desc)));
            eprintln!("====================");
            dbg!(i);
            dbg!(OsString::from_wide(&desc.Description));
            dbg!(desc.VendorId);
            dbg!(desc.DeviceId);
            dbg!(desc.SubSysId);
            dbg!(desc.Revision);
            dbg!(desc.DedicatedVideoMemory);
            dbg!(desc.DedicatedSystemMemory);
            dbg!(desc.SharedSystemMemory);
            dbg!(desc.AdapterLuid.LowPart);
            dbg!(desc.AdapterLuid.HighPart);
            i += 1;
        }
    }
}

Optimusを切った場合、GeForceとMicrosoft Basic Render Driverしか見えなくなる。

NvOptimusEnablementを宣言したバイナリに対しては、NVIDIA Control Panelで"Integrated graphics"を指示してもGeForceが一番上に来る。