From 5ba5c7abd5deb5093b8728eb4b9bb1a2d0e4bf42 Mon Sep 17 00:00:00 2001
From: Robert Hargreaves <kiyouta@gmail.com>
Date: Tue, 23 Jul 2024 20:56:05 +0100
Subject: [PATCH] Implement portamento for all MIDI channels

---
 src/midi.c                        | 51 ++++++++++++++++---------------
 tests/unit/test_midi.h            |  2 +-
 tests/unit/test_midi_portamento.c | 33 +++++++++++---------
 3 files changed, 45 insertions(+), 41 deletions(-)

diff --git a/src/midi.c b/src/midi.c
index 80582a2..1df1180 100644
--- a/src/midi.c
+++ b/src/midi.c
@@ -923,32 +923,33 @@ void midi_reset(void)
 
 void midi_tick(void)
 {
-    u8 chan = 0;
-    MidiChannel* midiChannel = &midiChannels[chan];
-    if (midiChannel->portamento) {
-
-        for (DeviceChannel* state = &deviceChannels[0]; state < &deviceChannels[DEV_CHANS];
-             state++) {
-            if (state->midiChannel == chan && state->noteOn) {
-
-                const s8 increment = 10;
-
-                if (state->glideTargetPitch > state->pitch) {
-                    state->cents += increment;
-                    if (state->cents == 100) {
-                        state->pitch++;
-                        state->cents = 0;
-                    }
-                    state->ops->pitch(state->number, state->pitch, state->cents);
-                } else if (state->glideTargetPitch < state->pitch
-                    || (state->glideTargetPitch == state->pitch && state->cents > 0)) {
-                    state->cents -= increment;
-                    if (state->cents == (0 - increment)) {
-                        state->pitch--;
-                        state->cents = 100 - increment;
+    for (u8 chan = 0; chan < MIDI_CHANNELS; chan++) {
+        MidiChannel* midiChannel = &midiChannels[chan];
+        if (midiChannel->portamento) {
+
+            for (DeviceChannel* state = &deviceChannels[0]; state < &deviceChannels[DEV_CHANS];
+                 state++) {
+                if (state->midiChannel == chan && state->noteOn) {
+
+                    const s8 increment = 10;
+
+                    if (state->glideTargetPitch > state->pitch) {
+                        state->cents += increment;
+                        if (state->cents == 100) {
+                            state->pitch++;
+                            state->cents = 0;
+                        }
+                        state->ops->pitch(state->number, state->pitch, state->cents);
+                    } else if (state->glideTargetPitch < state->pitch
+                        || (state->glideTargetPitch == state->pitch && state->cents > 0)) {
+                        state->cents -= increment;
+                        if (state->cents == (0 - increment)) {
+                            state->pitch--;
+                            state->cents = 100 - increment;
+                        }
+                        state->ops->pitch(state->number, state->pitch, state->cents);
+                    } else {
                     }
-                    state->ops->pitch(state->number, state->pitch, state->cents);
-                } else {
                 }
             }
         }
diff --git a/tests/unit/test_midi.h b/tests/unit/test_midi.h
index 6cf8af2..405b4b4 100644
--- a/tests/unit/test_midi.h
+++ b/tests/unit/test_midi.h
@@ -1,6 +1,6 @@
 #pragma once
 #include "cmocka_inc.h"
-
+#include "debug.h"
 #include "midi.h"
 #include "midi_fm.h"
 #include "midi_psg.h"
diff --git a/tests/unit/test_midi_portamento.c b/tests/unit/test_midi_portamento.c
index 9dc6a8c..f79579b 100644
--- a/tests/unit/test_midi_portamento.c
+++ b/tests/unit/test_midi_portamento.c
@@ -2,26 +2,29 @@
 
 static void test_midi_portamento_glides_note_up(UNUSED void** state)
 {
-    __real_midi_cc(0, CC_PORTAMENTO_ENABLE, 127);
+    for (u8 chan = 0; chan < MAX_FM_CHANS; chan++) {
+        debug_message("channel %d\n", chan);
+        __real_midi_cc(chan, CC_PORTAMENTO_ENABLE, 127);
 
-    expect_synth_pitch(0, 2, 0x439);
-    expect_synth_volume_any();
-    expect_synth_noteOn(0);
-    __real_midi_note_on(0, MIDI_PITCH_A2, MAX_MIDI_VOLUME);
-    __real_midi_note_on(0, MIDI_PITCH_C4, MAX_MIDI_VOLUME);
+        expect_synth_pitch(chan, 2, 0x439);
+        expect_synth_volume_any();
+        expect_synth_noteOn(chan);
+        __real_midi_note_on(chan, MIDI_PITCH_A2, MAX_MIDI_VOLUME);
+        __real_midi_note_on(chan, MIDI_PITCH_C4, MAX_MIDI_VOLUME);
 
-    expect_synth_pitch(0, 2, 0x43f);
-    midi_tick();
-    for (u16 i = 0; i < 148; i++) {
-        expect_synth_pitch_any();
+        expect_synth_pitch(chan, 2, 0x43f);
         midi_tick();
-    }
+        for (u16 i = 0; i < 148; i++) {
+            expect_synth_pitch_any();
+            midi_tick();
+        }
 
-    expect_synth_pitch(0, 4, 644);
-    midi_tick();
+        expect_synth_pitch(chan, 4, 644);
+        midi_tick();
 
-    midi_tick();
-    midi_tick();
+        midi_tick();
+        midi_tick();
+    }
 }
 
 static void test_midi_portamento_glides_note_down(UNUSED void** state)