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Add basic sending of midi data through portmidi

--- a/tui_main.c

+++ b/tui_main.c

@@ -841,6 +841,8 @@

     case Midi_mode_type_null:

       break;

     case Midi_mode_type_osc_bidule: {

+      if (!oosc_dev)

+        continue;

       I32 ints[3];

       ints[0] = (0x8 << 4) | (U8)chan; // status

       ints[1] = (I32)note;             // note number

@@ -850,6 +852,11 @@

     } break;

 #ifdef FEAT_PORTMIDI

     case Midi_mode_type_portmidi: {

+      int istatus = (0x8 << 4) | (int)chan;

+      int inote = (int)note;

+      int ivel = 0;

+      Pm_WriteShort(midi_mode->portmidi.stream, 0,

+                    Pm_Message(istatus, inote, ivel));

     } break;

 #endif

     }

@@ -926,6 +933,9 @@

       ++midi_note_count;

     } break;

     case Oevent_type_osc_ints: {

+      // kinda lame

+      if (!oosc_dev)

+        continue;

       Oevent_osc_ints const* eo = &e->osc_ints;

       char path_buff[3];

       path_buff[0] = '/';

@@ -956,6 +966,8 @@

       case Midi_mode_type_null:

         break;

       case Midi_mode_type_osc_bidule: {

+        if (!oosc_dev)

+          continue; // not sure if needed

         I32 ints[3];

         ints[0] = (0x9 << 4) | mno.channel; // status

         ints[1] = mno.note_number;          // note number

@@ -965,6 +977,15 @@

       } break;

 #ifdef FEAT_PORTMIDI

       case Midi_mode_type_portmidi: {

+        int istatus = (0x9 << 4) | (int)mno.channel;

+        int inote = (int)mno.note_number;

+        int ivel = (int)mno.velocity;

+        PmError pme = Pm_WriteShort(midi_mode->portmidi.stream, 0,

+                                    Pm_Message(istatus, inote, ivel));

+        // todo bad

+        if (pme) {

+          fprintf(stderr, "PortMIDI error: %s\n", Pm_GetErrorText(pme));

+        }

       } break;

 #endif

       }

@@ -1055,7 +1076,7 @@

     a->is_draw_dirty = true;

     Usz count = a->oevent_list.count;

-    if (oosc_dev && count > 0) {

+    if (count > 0) {

       send_output_events(oosc_dev, midi_mode, a->bpm, &a->susnote_list,

                          a->oevent_list.buffer, count);

     }