[oden] Challenge for step 2

src/lib.rs

@@ -12,8 +12,12 @@ struct State {
     config: wgpu::SurfaceConfiguration,
     size: winit::dpi::PhysicalSize<u32>,
     window: Window,
+    mouse_x: f64,
+    mouse_y: f64,
 }
 
+// TUTORIAL FOR BABIES LIKE ME: https://sotrh.github.io/learn-wgpu/beginner/tutorial2-surface/
+
 impl State {
     // Creating some of the wgpu types requires async code
     async fn new(window: Window) -> Self {
@@ -89,6 +93,8 @@ impl State {
             queue,
             config,
             size,
+            mouse_x: 0.0,
+            mouse_y: 0.0,
         }
     }
 
@@ -123,6 +129,11 @@ impl State {
             });
 
         {
+            // BEGIN GARBAGE
+            let r: f64 = (self.mouse_x / f64::from(self.size.width)).clamp(0.0, 1.0) * 0.1;
+            let g: f64 = (self.mouse_y / f64::from(self.size.height)).clamp(0.0, 1.0) * 0.2;
+            // END GARBAGE
+
             let _render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
                 label: Some("Render Pass"),
                 color_attachments: &[Some(wgpu::RenderPassColorAttachment {
@@ -130,8 +141,8 @@ impl State {
                     resolve_target: None,
                     ops: wgpu::Operations {
                         load: wgpu::LoadOp::Clear(wgpu::Color {
-                            r: 0.1,
-                            g: 0.2,
+                            r, //0.1,
+                            g, //0.2,
                             b: 0.3,
                             a: 1.0,
                         }),
@@ -142,7 +153,7 @@ impl State {
             });
         }
 
-        // submit will accept anything that implements IntoIter
+        // Submit will accept anything that implements IntoIter
         self.queue.submit(std::iter::once(encoder.finish()));
         output.present();
 
@@ -157,6 +168,10 @@ pub async fn run() {
 
     let mut state = State::new(window).await;
 
+    // NOTE: There's some well-understood way here of doing constant
+    //       rendering rather than being driven by events but I removed it
+    //       for now. I will have to find it again at some point.
+
     event_loop.run(move |event, _, control_flow| match event {
         Event::WindowEvent {
             ref event,
@@ -175,6 +190,12 @@ pub async fn run() {
                         ..
                     } => *control_flow = ControlFlow::Exit,
 
+                    WindowEvent::CursorMoved { position, .. } => {
+                        state.mouse_x = position.x;
+                        state.mouse_y = position.y;
+                        state.window().request_redraw();
+                    }
+
                     WindowEvent::Resized(physical_size) => {
                         state.resize(*physical_size);
                     }