Expose raw_factory (gfx-rs#7827)

Co-authored-by: Connor Fitzgerald <[email protected]>

Author: MendyBerger

CHANGELOG.md

@@ -124,6 +124,7 @@ Bottom level categories:
 #### D3D12
 
 - Remove the need for dxil.dll. By @teoxoy in [#7566](https://github.com/gfx-rs/wgpu/pull/7566)
+- Ability to get the raw `IDXGIFactory4` from `Instance`. By @MendyBerger in [#7827](https://github.com/gfx-rs/wgpu/pull/7827)
 
 #### Vulkan
 

wgpu-hal/src/dx12/mod.rs

@@ -465,6 +465,11 @@ pub struct Instance {
 }
 
 impl Instance {
+    /// Get the raw DXGI factory associated with this instance.
+    pub unsafe fn raw_factory4(&self) -> &Dxgi::IDXGIFactory4 {
+        self.factory.deref()
+    }
+
     pub unsafe fn create_surface_from_visual(&self, visual: *mut ffi::c_void) -> Surface {
         let visual = unsafe { DirectComposition::IDCompositionVisual::from_raw_borrowed(&visual) }
             .expect("COM pointer should not be NULL");