groovebox: display input meters!

crates/device/src/meter.rs

@@ -1,16 +1,36 @@
 use crate::*;
 
-#[derive(Debug, Default, Clone)]
-pub struct RMSMeter(f32);
-
-impl RMSMeter {
-    pub fn set (&mut self, samples: &[u32]) {
-        let sum: usize = samples.iter().map(|s|*s as usize).reduce(|sum, sample|sum + sample)
-            .unwrap_or(0);
-        self.0 = (sum as f32 / samples.len() as f32).sqrt();
-    }
+#[derive(Debug, Default)]
+pub enum MeteringMode {
+    #[default]
+    Rms,
+    Log10,
 }
 
-render!(TuiOut: |self: RMSMeter, to| {
+#[derive(Debug, Default, Clone)]
+pub struct Meter(pub f32);
+
+render!(TuiOut: |self: Meter, to| {
     let [x, y, w, h] = to.area();
+    let signal = 100.0 - f32::max(0.0, f32::min(100.0, self.0.abs()));
+    let v = (signal * h as f32 / 100.0).ceil() as u16;
+    let y2 = y + h;
+    //to.blit(&format!("\r{v} {} {signal}", self.0), x * 20, y, None);
+    for y in y..(y + v) {
+        for x in x..(x + w) {
+            to.blit(&"▌", x, y2 - y, Some(Style::default().green()));
+        }
+    }
 });
+
+pub fn to_rms (samples: &[u32]) -> f32 {
+    let sum: usize = samples.iter()
+        .map(|s|*s as usize)
+        .reduce(|sum, sample|sum + sample)
+        .unwrap_or(0);
+    (sum as f32 / samples.len() as f32).sqrt()
+}
+
+pub fn to_log10 (samples: &[u32]) -> f32 {
+    0.0
+}