gui: wgpu fallback renderer for desktop (#31)

Reviewed-on: https://code.gri.mw/GUI/grim/pulls/31

Cargo.lock

@@ -2485,6 +2485,7 @@ dependencies = [
  "objc2-foundation 0.2.2",
  "parking_lot 0.12.5",
  "percent-encoding",
+ "pollster",
  "profiling",
  "raw-window-handle",
  "static_assertions",
@@ -2492,6 +2493,7 @@ dependencies = [
  "wasm-bindgen-futures",
  "web-sys",
  "web-time",
+ "wgpu",
  "windows-sys 0.61.2",
  "winit",
 ]

Cargo.toml

@@ -154,7 +154,7 @@ nokhwa-mac = { git = "https://code.gri.mw/ardocrat/nokhwa", rev = "612c861ef153c
 [target.'cfg(not(target_os = "android"))'.dependencies]
 env_logger = "0.11.3"
 winit = { version = "0.30.12" }
-eframe = { version = "0.33.2", default-features = false, features = ["glow", "wayland"] }
+eframe = { version = "0.33.2", default-features = false, features = ["glow", "wgpu", "wayland"] }
 arboard = "3.2.0"
 rfd = "0.15.0"
 interprocess = { version = "2.2.1", features = ["tokio"] }

src/main.rs

@@ -134,7 +134,7 @@ fn start_desktop_gui(platform: grim::gui::platform::Desktop) {
         .with_transparent(true)
         .with_decorations(is_mac || is_win);
 
-    let options = eframe::NativeOptions {
+    let mut options = eframe::NativeOptions {
         renderer: eframe::Renderer::Glow,
         viewport,
         ..Default::default()
@@ -142,7 +142,24 @@ fn start_desktop_gui(platform: grim::gui::platform::Desktop) {
 
     // Start GUI.
     let app = grim::gui::App::new(platform.clone());
-    grim::start(options.clone(), grim::app_creator(app)).unwrap();
+    match grim::start(options.clone(), grim::app_creator(app)) {
+        Ok(_) => {}
+        Err(e) => {
+            if is_win {
+                panic!("{}", e);
+            }
+            // Start with another renderer on error.
+            options.renderer = eframe::Renderer::Wgpu;
+
+            let app = grim::gui::App::new(platform);
+            match grim::start(options, grim::app_creator(app)) {
+                Ok(_) => {}
+                Err(e) => {
+                    panic!("{}", e);
+                }
+            }
+        }
+    }
 }
 
 /// Check if application is already running to pass data.