groovebox: add slots for output meters

crates/app/src/view.rs

@@ -59,6 +59,9 @@ impl App {
     pub fn view_meters_input (&self) -> impl Content<TuiOut> + use<'_> {
         self.sampler().map(|s|s.view_meters_input())
     }
+    pub fn view_meters_output (&self) -> impl Content<TuiOut> + use<'_> {
+        self.sampler().map(|s|s.view_meters_output())
+    }
 }
 
 impl App {

crates/device/src/sampler/sampler_model.rs

@@ -52,8 +52,8 @@ impl Default for Sampler {
         Self {
             midi_in:        None,
             audio_ins:      vec![],
-            input_meters:   vec![0.0;2],
-            output_meters:  vec![0.0;2],
+            input_meters:   vec![f32::MIN;2],
+            output_meters:  vec![f32::MIN;2],
             audio_outs:     vec![],
             name:           "tek_sampler".to_string(),
             mapped:         [const { None };128],

crates/device/src/sampler/sampler_view.rs

@@ -108,6 +108,12 @@ impl Sampler {
             Fill::y(Meter(*value))
         })))
     }
+
+    pub fn view_meters_output (&self) -> impl Content<TuiOut> + use<'_> {
+        Tui::bg(Black, Fixed::x(2, Map::east(1, ||self.output_meters.iter(), |value, _index|{
+            Fill::y(Meter(*value))
+        })))
+    }
 }
 
 fn draw_list_item (sample: &Option<Arc<RwLock<Sample>>>) -> String {