linux: Better GPU debugging (#14706)

Release Notes:

- linux: Added GPU information to `editor: Copy System Specs to
Clipboard`
- linux: Show a prominant warning before running under llvmpipe and
similar.

crates/zed/src/zed.rs

@@ -139,6 +139,30 @@ pub fn initialize_workspace(app_state: Arc<AppState>, cx: &mut AppContext) {
         })
         .detach();
 
+        if let Some(specs) = cx.gpu_specs() {
+            log::info!("Using GPU: {:?}", specs);
+            if specs.is_software_emulated && std::env::var("ZED_ALLOW_EMULATED_GPU").is_err() {
+            let message = format!(db::indoc!{r#"
+                Zed uses Vulkan for rendering and requires a compatible GPU.
+
+                Currently you are using a software emulated GPU ({}) which
+                will result in awful performance.
+
+                For troubleshooting see: https://zed.dev/docs/linux
+                "#}, specs.device_name);
+            let prompt = cx.prompt(PromptLevel::Critical, "Unsupported GPU", Some(&message),
+                &["Troubleshoot and Quit"]);
+            cx.spawn(|_, mut cx| async move {
+                if prompt.await == Ok(0) {
+                    cx.update(|cx| {
+                        cx.open_url("https://zed.dev/docs/linux#zed-fails-to-open-windows");
+                        cx.quit();
+                    }).ok();
+                }
+            }).detach()
+            }
+        }
+
         let inline_completion_button = cx.new_view(|cx| {
             inline_completion_button::InlineCompletionButton::new(app_state.fs.clone(), cx)
         });