Launch a blank window for the editor

editor/Cargo.toml

@@ -48,6 +48,24 @@ tokio = { version = "0.2", features = ["blocking", "fs", "sync", "rt-threaded",
 # This way, GitHub Actions works and nobody's builds get broken.
 inkwell = { git = "https://github.com/rtfeldman/inkwell", tag = "llvm10-0.release1" }
 target-lexicon = "0.10"
+winit = "0.22"
+image = "0.23"
+gfx-hal = "0.5"
+
+[target.'cfg(target_os = "macos")'.dependencies.backend]
+package = "gfx-backend-metal"
+version = "0.5"
+
+[target.'cfg(windows)'.dependencies.backend]
+package = "gfx-backend-dx12"
+version = "0.5"
+
+[target.'cfg(all(unix, not(target_os = "macos")))'.dependencies.backend]
+package = "gfx-backend-vulkan"
+version = "0.5"
+
+[build-dependencies]
+glsl-to-spirv = "0.1"
 
 [dev-dependencies]
 pretty_assertions = "0.5.1"
@@ -55,3 +73,4 @@ maplit = "1.0.1"
 indoc = "0.3.3"
 quickcheck = "0.8"
 quickcheck_macros = "0.8"
+

editor/src/lib.rs

@@ -2,7 +2,43 @@ use std::io;
 
 /// The editor is actually launched from the CLI if you pass it zero arguments.
 pub fn launch() -> io::Result<()> {
-    println!("TODO launch the editor.");
+    // TODO do any initialization here
+
+    run_event_loop();
 
     Ok(())
 }
+
+use winit::{
+    event::{Event, WindowEvent},
+    event_loop::{ControlFlow, EventLoop},
+    window::WindowBuilder,
+};
+
+fn run_event_loop() {
+    let event_loop = EventLoop::new();
+    let window = WindowBuilder::new().build(&event_loop).unwrap();
+
+    event_loop.run(move |event, _, control_flow| {
+        // TODO try ControlFlow::Poll and see if it affects input latency.
+        // Otherwise, this seems like a better default for minimizing idle
+        // CPU usage and battry drain. (Might want to switch to Poll whenever
+        // there are animations in progress though.)
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => {
+                println!("Thank you for flying Roc Airlines!");
+                *control_flow = ControlFlow::Exit
+            }
+            Event::MainEventsCleared => window.request_redraw(),
+            Event::RedrawRequested(_) => {
+                // TODO render the editor
+            }
+            _ => (),
+        }
+    });
+}