fretboard: make lookup table 128 bits

Author: algorithmiker

src/backend/muxml/fretboard.rs

@@ -46,4 +46,4 @@ pub fn get_fretboard_note2(string: char, fret: u8) -> Option<MuxmlNote2> {
 /// cache line
 /// Generated by tools/gen_note_lookup.rs
 #[rustfmt::skip]
-const STRING_BASE_NOTES: [Option<NonZeroU8>;256] = unsafe {[None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, Some(NonZeroU8::new(45).unwrap_unchecked()), Some(NonZeroU8::new(59).unwrap_unchecked()), None, Some(NonZeroU8::new(50).unwrap_unchecked()), Some(NonZeroU8::new(40).unwrap_unchecked()), None, Some(NonZeroU8::new(55).unwrap_unchecked()), None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, Some(NonZeroU8::new(62).unwrap_unchecked()), Some(NonZeroU8::new(64).unwrap_unchecked()), None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None]};
+const STRING_BASE_NOTES: [Option<NonZeroU8>;128] = unsafe {[None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, Some(NonZeroU8::new(45).unwrap_unchecked()), Some(NonZeroU8::new(59).unwrap_unchecked()), None, Some(NonZeroU8::new(50).unwrap_unchecked()), Some(NonZeroU8::new(40).unwrap_unchecked()), None, Some(NonZeroU8::new(55).unwrap_unchecked()), None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, Some(NonZeroU8::new(62).unwrap_unchecked()), Some(NonZeroU8::new(64).unwrap_unchecked()), None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None]};

tools/gen_note_lookup.rs

@@ -1,12 +1,13 @@
 use std::fmt::Write;
 use std::num::NonZeroU8;
 fn main() {
-    let mut lookup = vec![String::from("None"); 256];
+    let mut lookup = vec![String::from("None"); 128];
     let mut set_lookup = |c: char, value: u8| {
         lookup[c as usize] = format!("Some(NonZeroU8::new({value}).unwrap_unchecked())");
     };
     // octave * 12 + offset in the 12-scale
-    // (so octave 0, C = 0)
+    // (so octave 0, C = 0).
+    // Incidentally, this is also the encoding used by MIDI.
     set_lookup('E', 3 * 12 + 4);
     set_lookup('A', 3 * 12 + 9);
     set_lookup('D', 4 * 12 + 2);