Improve GPU selection on Windows (#39264)

Cave Bats Of Ware created 3 weeks ago

Closes #39263

Release Notes:
- N/A 

from
https://github.com/zed-industries/zed/issues/39263#issuecomment-3358220988

> 
> > If you replace that code with
> > 
> > let adapter: IDXGIAdapter1 = unsafe { 
> >    dxgi_factory.EnumAdapters(adapter_index) 
> > }?.cast()?; 
> > 
> > does it not select the right GPU?
>  
> @reflectronic That does seem to select the active gpu for me, meaning
whichever GPU is currently connected. This is a much simpler solution
than the one I have here
(https://github.com/zed-industries/zed/pull/39264 - updated) and while
I'm sure I could imagine someone wanting to choose their GPU to render
Zed on, that may not be something that the application really needs to
support.
> 
> I have a branch with just this as the only change that I can push to
that PR if the simpler solution is preferred.
> 
> ```rust
>         let adapter: IDXGIAdapter1 = unsafe {
>             dxgi_factory.EnumAdapters(adapter_index)?.cast()?
>         };
> ```

Change summary

crates/gpui/src/platform/windows/directx_devices.rs | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

Detailed changes

crates/gpui/src/platform/windows/directx_devices.rs

@@ -14,10 +14,11 @@ use windows::Win32::{
         },
         Dxgi::{
             CreateDXGIFactory2, DXGI_CREATE_FACTORY_DEBUG, DXGI_CREATE_FACTORY_FLAGS,
-            DXGI_GPU_PREFERENCE_MINIMUM_POWER, IDXGIAdapter1, IDXGIFactory6,
+            IDXGIAdapter1, IDXGIFactory6,
         },
     },
 };
+use windows::core::Interface;
 
 pub(crate) fn try_to_recover_from_device_lost<T>(
     mut f: impl FnMut() -> Result<T>,
@@ -121,10 +122,7 @@ fn get_dxgi_factory(debug_layer_available: bool) -> Result<IDXGIFactory6> {
 #[inline]
 fn get_adapter(dxgi_factory: &IDXGIFactory6, debug_layer_available: bool) -> Result<IDXGIAdapter1> {
     for adapter_index in 0.. {
-        let adapter: IDXGIAdapter1 = unsafe {
-            dxgi_factory
-                .EnumAdapterByGpuPreference(adapter_index, DXGI_GPU_PREFERENCE_MINIMUM_POWER)
-        }?;
+        let adapter: IDXGIAdapter1 = unsafe { dxgi_factory.EnumAdapters(adapter_index)?.cast()? };
         if let Ok(desc) = unsafe { adapter.GetDesc1() } {
             let gpu_name = String::from_utf16_lossy(&desc.Description)
                 .trim_matches(char::from(0))