🚧 wip: messing around with getting webcam data into egui

src/capture.rs

@@ -23,7 +23,7 @@ impl Capture
     {
         let x = Device::open ("/dev/video0")?;
         dbg! (x.formats (linuxvideo::BufType::VIDEO_CAPTURE).collect::<Vec <_>> ());
-        let x = x.video_capture (PixFormat::new (u32::MAX, u32::MAX, PixelFormat::MJPG))?;
+        let x = x.video_capture (PixFormat::new (u32::MAX, u32::MAX, PixelFormat::YUYV))?;
         dbg! (x.format ());
         let size_image = usize::try_from (x.format ().size_image ()).unwrap ();
         let stream = x.into_stream ()?;
@@ -57,6 +57,11 @@ impl Capture
             Ok (input.len ())
         })?)
     }
+    
+    pub fn will_block (&self) -> std::io::Result <bool>
+    {
+        self.stream.will_block ()
+    }
 }
 
 #[derive (Debug, thiserror::Error)]

src/main.rs

@@ -127,23 +127,52 @@ fn main() -> Result <(), Error>
     Ok (())
 }
 
-#[derive(Default)]
-struct MyEguiApp {}
+struct MyEguiApp {
+    img: egui::ColorImage,
+    texture: Option <egui::TextureHandle>,
+    capture: capture::Capture,
+}
 
 impl MyEguiApp {
-    fn new(cc: &eframe::CreationContext<'_>) -> Self {
+    fn new(_cc: &eframe::CreationContext<'_>) -> Self {
         // Customize egui here with cc.egui_ctx.set_fonts and cc.egui_ctx.set_visuals.
         // Restore app state using cc.storage (requires the "persistence" feature).
         // Use the cc.gl (a glow::Context) to create graphics shaders and buffers that you can use
         // for e.g. egui::PaintCallback.
-        Self::default()
+        
+        let img = egui::ColorImage::new ([1920,1080], egui::Color32::TEMPORARY_COLOR);
+        
+        Self 
+        {
+            img,
+            texture: None,
+            capture: capture::Capture::new ().unwrap (),
+        }
     }
 }
 
 impl eframe::App for MyEguiApp {
-   fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         egui::CentralPanel::default().show(ctx, |ui| {
+            let texture = self.texture.get_or_insert_with(||
+            {
+                ui.ctx ().load_texture ("my_image", self.img.clone (), Default::default())
+            });
+            
+            match self.capture.will_block ()
+            {
+                Ok (false) => 
+                {
+                    self.capture.wait_for_frame(self.img.as_raw_mut()).unwrap ();
+                    texture.set (self.img.clone (), Default::default ());
+                },
+                _ => (),
+            }
+            
+            let texture: &egui::TextureHandle = texture;
+            
             ui.heading("Hello World!");
+            ui.image (texture, texture.size_vec2());
         });
     }
 }
@@ -151,7 +180,7 @@ impl eframe::App for MyEguiApp {
 fn main_egui ()
 {
     let native_options = eframe::NativeOptions::default();
-    eframe::run_native("My egui App", native_options, Box::new(|cc| Box::new(MyEguiApp::new(cc))));
+    eframe::run_native("My egui App", native_options, Box::new(|cc| Box::new(MyEguiApp::new(cc)))).unwrap ();
 }
 
 struct ThreadSystem <'a>