From 68c082bebaac3b0412b2f373b27d8b8894f07467 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Thu, 9 Feb 2023 19:08:06 +0100
Subject: Add round-robin to channel selection

---
 src/app.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'src/app.c')

diff --git a/src/app.c b/src/app.c
index aacc68f..a035022 100644
--- a/src/app.c
+++ b/src/app.c
@@ -209,6 +209,7 @@ State state = {0};
 u32 note_counter = 0;
 u8 midi_in_connected = 0;
 u8 midi_out_connected = 0;
+u8 next_voice = 0;
 
 // store ADC frame pointer
 static const u16 *g_ADC = 0;
@@ -365,13 +366,14 @@ app_midi_event(u8 port, u8 status, u8 d1, u8 d2) {
         return;
     }
     u8 channel = status & 0x0F;
+    u8 max_voices = (state.ch_max - state.ch_min + 1);
     // If the channel isn't set to listen, just passthrough the message.
     if (!state.ch_listen[channel]) {
         hal_send_midi(port, status, d1, d2);
         return;
     }
     if ((status & 0xF0) == NOTEON) {
-        if (n_voices == (state.ch_max - state.ch_min + 1)) {
+        if (n_voices == max_voices) {
             u8 selected = 0;
             switch (state.stealing) {
                 case POLY_STEAL_OFF: {
@@ -439,7 +441,7 @@ app_midi_event(u8 port, u8 status, u8 d1, u8 d2) {
             if (!voice->active) {
                 voice->active = 1;
                 voice->port = port;
-                voice->channel = i;
+                voice->channel = state.ch_min + (next_voice++ % max_voices) ;
                 voice->d1 = d1;
                 voice->d2 = d2;
                 hal_send_midi(voice->port,
@@ -455,10 +457,9 @@ app_midi_event(u8 port, u8 status, u8 d1, u8 d2) {
     } else if ((status & 0xF0) == NOTEOFF) {
         for (u8 i = state.ch_min; i <= state.ch_max; i++) {
             Voice *voice = &voices[i];
-            // Register voice.
             if (voice->active && voice->d1 == d1) {
                 voice->active = 0;
-                hal_send_midi(port, NOTEOFF | i, d1, d2);
+                hal_send_midi(port, NOTEOFF | voice->channel, d1, d2);
                 n_voices--;
                 break;
             }
-- 
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