Add WGPU adapter selection using WGPU_ADAPTER

CHANGELOG.md

@@ -30,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add server setting with PvE/PvP switch
 - Can now tilt glider while only wielding it
 - Experimental terrain persistence (see server documentation)
+- Add GPU filtering using WGPU_ADAPTER environment variable
 
 ### Changed
 

voxygen/src/render/renderer.rs

@@ -224,11 +224,38 @@ impl Renderer {
         #[allow(unsafe_code)]
         let surface = unsafe { instance.create_surface(window) };
 
-        let adapter = runtime
+        let adapters = instance
-            .block_on(instance.request_adapter(&wgpu::RequestAdapterOptionsBase {
+            .enumerate_adapters(backend_bit)
+            .enumerate()
+            .collect::<Vec<_>>();
+
+        for (i, adapter) in adapters.iter() {
+            let info = adapter.get_info();
+            info!(
+                ?info.name,
+                ?info.vendor,
+                ?info.backend,
+                ?info.device,
+                ?info.device_type,
+                "graphics device #{}", i,
+            );
+        }
+
+        let adapter = match std::env::var("WGPU_ADAPTER").ok() {
+            Some(filter) if !filter.is_empty() => adapters.into_iter().find_map(|(i, adapter)| {
+                let info = adapter.get_info();
+
+                let full_name = format!("#{} {} {:?}", i, info.name, info.device_type,);
+
+                full_name.contains(&filter).then(|| adapter)
+            }),
+            Some(_) | None => {
+                runtime.block_on(instance.request_adapter(&wgpu::RequestAdapterOptionsBase {
                     power_preference: wgpu::PowerPreference::HighPerformance,
                     compatible_surface: Some(&surface),
                 }))
+            },
+        }
         .ok_or(RenderError::CouldNotFindAdapter)?;
 
         let info = adapter.get_info();