add MIDI debug

issue #1701

src/engine/engine.cpp

@@ -3412,6 +3412,10 @@ void DivEngine::setMidiCallback(std::function<int(const TAMidiMessage&)> what) {
   midiCallback=what;
 }
 
+void DivEngine::setMidiDebug(bool enable) {
+  midiDebug=enable;
+}
+
 bool DivEngine::sendMidiMessage(TAMidiMessage& msg) {
   if (output==NULL) {
     logW("output is NULL!");

src/engine/engine.h

@@ -497,6 +497,7 @@ class DivEngine {
   short effectSlotMap[4096];
   int midiBaseChan;
   bool midiPoly;
+  bool midiDebug;
   size_t midiAgeCounter;
 
   blip_buffer_t* samp_bb;
@@ -1208,6 +1209,9 @@ class DivEngine {
     // send MIDI message
     bool sendMidiMessage(TAMidiMessage& msg);
 
+    // enable MIDI debug
+    void setMidiDebug(bool enable);
+
     // perform secure/sync operation
     void synchronized(const std::function<void()>& what);
 
@@ -1329,6 +1333,7 @@ class DivEngine {
       cmdStreamInt(NULL),
       midiBaseChan(0),
       midiPoly(true),
+      midiDebug(false),
       midiAgeCounter(0),
       samp_bb(NULL),
       samp_bbInLen(0),

src/engine/playback.cpp

@@ -1841,6 +1841,13 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
   // process MIDI events (TODO: everything)
   if (output) if (output->midiIn) while (!output->midiIn->queue.empty()) {
     TAMidiMessage& msg=output->midiIn->queue.front();
+    if (midiDebug) {
+      if (msg.type==TA_MIDI_SYSEX) {
+        logD("MIDI debug: %.2X SysEx",msg.type);
+      } else {
+        logD("MIDI debug: %.2X %.2X %.2X",msg.type,msg.data[0],msg.data[1]);
+      }
+    }
     int ins=-1;
     if ((ins=midiCallback(msg))!=-2) {
       int chan=msg.type&15;

src/gui/debugWindow.cpp

@@ -432,6 +432,13 @@ void FurnaceGUI::drawDebug() {
 
       ImGui::TreePop();
     }
+    if (ImGui::TreeNode("MIDI Debug")) {
+      if (ImGui::Button("Enable Debug (go to log viewer")) {
+        e->setMidiDebug(true);
+        nextWindow=GUI_WINDOW_LOG;
+      }
+      ImGui::TreePop();
+    }
     if (ImGui::TreeNode("Visualizer Debug")) {
       if (ImGui::BeginTable("visX",3,ImGuiTableFlags_Borders)) {
         ImGui::TableNextRow(ImGuiTableRowFlags_Headers);