add note preview feature

src/engine/engine.cpp

@@ -1542,12 +1542,14 @@ int DivEngine::calcFreq(int base, int pitch, bool period) {
 
 void DivEngine::play() {
   isBusy.lock();
+  freelance=false;
   playSub(false);
   isBusy.unlock();
 }
 
 void DivEngine::stop() {
   isBusy.lock();
+  freelance=false;
   playing=false;
   extValuePresent=false;
   isBusy.unlock();
@@ -1693,7 +1695,7 @@ unsigned char DivEngine::getExtValue() {
 }
 
 bool DivEngine::isPlaying() {
-  return playing;
+  return (playing && !freelance);
 }
 
 bool DivEngine::isChannelMuted(int chan) {
@@ -1902,7 +1904,7 @@ void DivEngine::addOrder(bool duplicate, bool where) {
     }
     song.ordersLen++;
     curOrder++;
-    if (playing) {
+    if (playing && !freelance) {
       playSub(false);
     }
   }
@@ -1919,7 +1921,7 @@ void DivEngine::deleteOrder() {
   }
   song.ordersLen--;
   if (curOrder>=song.ordersLen) curOrder=song.ordersLen-1;
-  if (playing) {
+  if (playing && !freelance) {
     playSub(false);
   }
   isBusy.unlock();
@@ -1937,7 +1939,7 @@ void DivEngine::moveOrderUp() {
     song.orders.ord[i][curOrder]^=song.orders.ord[i][curOrder-1];
   }
   curOrder--;
-  if (playing) {
+  if (playing && !freelance) {
     playSub(false);
   }
   isBusy.unlock();
@@ -1955,17 +1957,39 @@ void DivEngine::moveOrderDown() {
     song.orders.ord[i][curOrder]^=song.orders.ord[i][curOrder+1];
   }
   curOrder++;
-  if (playing) {
+  if (playing && !freelance) {
     playSub(false);
   }
   isBusy.unlock();
 }
 
+void DivEngine::noteOn(int chan, int ins, int note, int vol) {
+  isBusy.lock();
+  pendingNotes.push(DivNoteEvent(chan,ins,note,vol,true));
+  if (!playing) {
+    reset();
+    freelance=true;
+    playing=true;
+  }
+  isBusy.unlock();
+}
+
+void DivEngine::noteOff(int chan) {
+  isBusy.lock();
+  pendingNotes.push(DivNoteEvent(chan,-1,-1,-1,false));
+  if (!playing) {
+    reset();
+    freelance=true;
+    playing=true;
+  }
+  isBusy.unlock();
+}
+
 void DivEngine::setOrder(unsigned char order) {
   isBusy.lock();
   curOrder=order;
   if (order>=song.ordersLen) curOrder=0;
-  if (playing) {
+  if (playing && !freelance) {
     playSub(false);
   }
   isBusy.unlock();

src/engine/engine.h

@@ -7,6 +7,7 @@
 #include "blip_buf.h"
 #include <mutex>
 #include <map>
+#include <queue>
 
 #define DIV_VERSION "0.1"
 #define DIV_ENGINE_VERSION 11
@@ -67,6 +68,17 @@ struct DivChannelState {
     inPorta(false) {}
 };
 
+struct DivNoteEvent {
+  int channel, ins, note, volume;
+  bool on;
+  DivNoteEvent(int c, int i, int n, int v, bool o):
+    channel(c),
+    ins(i),
+    note(n),
+    volume(v),
+    on(o) {}
+};
+
 class DivEngine {
   DivDispatch* dispatch;
   TAAudio* output;
@@ -74,6 +86,7 @@ class DivEngine {
   int chans;
   bool active;
   bool playing;
+  bool freelance;
   bool speedAB;
   bool endOfSong;
   bool consoleMode;
@@ -87,6 +100,7 @@ class DivEngine {
   DivChannelState chan[17];
   DivAudioEngines audioEngine;
   std::map<String,String> conf;
+  std::queue<DivNoteEvent> pendingNotes;
   bool isMuted[17];
   std::mutex isBusy;
   String configPath;
@@ -302,6 +316,12 @@ class DivEngine {
     // move order down
     void moveOrderDown();
 
+    // play note
+    void noteOn(int chan, int ins, int note, int vol=-1);
+
+    // stop note
+    void noteOff(int chan);
+
     // go to order
     void setOrder(unsigned char order);
 
@@ -347,6 +367,7 @@ class DivEngine {
       chans(0),
       active(false),
       playing(false),
+      freelance(false),
       speedAB(false),
       endOfSong(false),
       consoleMode(false),

src/engine/playback.cpp

@@ -705,6 +705,18 @@ bool DivEngine::nextTick(bool noAccum) {
     cycles++;
   }
 
+  while (!pendingNotes.empty()) {
+    DivNoteEvent& note=pendingNotes.front();
+    if (note.on) {
+      dispatchCmd(DivCommand(DIV_CMD_INSTRUMENT,note.channel,note.ins));
+      dispatchCmd(DivCommand(DIV_CMD_NOTE_ON,note.channel,note.note));
+    } else {
+      dispatchCmd(DivCommand(DIV_CMD_NOTE_OFF,note.channel));
+    }
+    pendingNotes.pop();
+  }
+
+  if (!freelance) {
     if (--ticks<=0) {
       ret=endOfSong;
       if (endOfSong) {
@@ -788,10 +800,12 @@ bool DivEngine::nextTick(bool noAccum) {
         chan[i].arpYield=false;
       }
     }
+  }
 
   // system tick
   dispatch->tick();
 
+  if (!freelance) {
     if (!noAccum) totalTicks++;
 
     int hz;
@@ -808,6 +822,7 @@ bool DivEngine::nextTick(bool noAccum) {
       cmdsPerSecond=totalCmds-lastCmds;
       lastCmds=totalCmds;
     }
+  }
 
   return ret;
 }

src/engine/song.h

@@ -124,7 +124,7 @@ struct DivSong {
     speed1(6),
     speed2(6),
     arpLen(1),
-    pal(false),
+    pal(true),
     customTempo(false),
     hz(60),
     patLen(64),

src/gui/gui.cpp

@@ -270,6 +270,8 @@ void FurnaceGUI::drawEditControls() {
     if (ImGui::Button(ICON_FA_STOP "##Stop")) {
       e->stop();
     }
+    ImGui::SameLine();
+    ImGui::Checkbox("Edit",&edit);
 
     ImGui::Text("Follow");
     ImGui::SameLine();
@@ -2083,6 +2085,9 @@ void FurnaceGUI::keyDown(SDL_Event& ev) {
       } else if (ev.key.keysym.mod&KMOD_ALT) {
         // nothing. prevents accidental OFF note.
       } else switch (ev.key.keysym.sym) {
+        case SDLK_SPACE:
+          edit=!edit;
+          break;
         case SDLK_UP:
           moveCursor(0,-1);
           break;
@@ -2111,10 +2116,13 @@ void FurnaceGUI::keyDown(SDL_Event& ev) {
           doInsert();
           break;
         default:
+          if (!ev.key.repeat) {
             if (cursor.xFine==0) { // note
               try {
                 int key=noteKeys.at(ev.key.keysym.sym);
                 int num=12*curOctave+key;
+
+                if (edit) {
                   DivPattern* pat=e->song.pat[cursor.xCoarse].getPattern(e->song.orders.ord[cursor.xCoarse][e->getOrder()],true);
                   
                   prepareUndo(GUI_ACTION_PATTERN_EDIT);
@@ -2130,13 +2138,23 @@ void FurnaceGUI::keyDown(SDL_Event& ev) {
                       pat->data[cursor.y][1]--;
                     }
                     pat->data[cursor.y][2]=curIns;
+                    e->noteOn(cursor.xCoarse,curIns,num);
+                    noteOffOnRelease=true;
+                    noteOffOnReleaseKey=ev.key.keysym.sym;
+                    noteOffOnReleaseChan=cursor.xCoarse;
                   }
                   makeUndo(GUI_ACTION_PATTERN_EDIT);
                   editAdvance();
                   curNibble=false;
+                } else {
+                  e->noteOn(cursor.xCoarse,curIns,num);
+                  noteOffOnRelease=true;
+                  noteOffOnReleaseKey=ev.key.keysym.sym;
+                  noteOffOnReleaseChan=cursor.xCoarse;
+                }
               } catch (std::out_of_range& e) {
               }
-          } else { // value
+            } else if (edit) { // value
               try {
                 int num=valueKeys.at(ev.key.keysym.sym);
                 DivPattern* pat=e->song.pat[cursor.xCoarse].getPattern(e->song.orders.ord[cursor.xCoarse][e->getOrder()],true);
@@ -2173,6 +2191,7 @@ void FurnaceGUI::keyDown(SDL_Event& ev) {
               } catch (std::out_of_range& e) {
               }
             }
+          }
           break;
       }
       break;
@@ -2183,7 +2202,12 @@ void FurnaceGUI::keyDown(SDL_Event& ev) {
 }
 
 void FurnaceGUI::keyUp(SDL_Event& ev) {
-  
+  if (noteOffOnRelease) {
+    if (ev.key.keysym.sym==noteOffOnReleaseKey) {
+      noteOffOnRelease=false;
+      e->noteOff(noteOffOnReleaseChan);
+    }
+  }
 }
 
 void FurnaceGUI::openFileDialog(FurnaceGUIFileDialogs type) {
@@ -2739,6 +2763,7 @@ FurnaceGUI::FurnaceGUI():
   e(NULL),
   quit(false),
   willCommit(false),
+  edit(false),
   curFileDialog(GUI_FILE_OPEN),
   scrW(1280),
   scrH(800),
@@ -2776,6 +2801,9 @@ FurnaceGUI::FurnaceGUI():
   followPattern(true),
   changeAllOrders(false),
   curWindow(GUI_WINDOW_NOTHING),
+  noteOffOnRelease(false),
+  noteOffOnReleaseKey(0),
+  noteOffOnReleaseChan(0),
   arpMacroScroll(0),
   macroDragStart(0,0),
   macroDragAreaSize(0,0),

src/gui/gui.h

@@ -1,4 +1,5 @@
 #include "../engine/engine.h"
+#include "SDL_keycode.h"
 #include "imgui.h"
 #include "imgui_impl_sdl.h"
 #include "imgui_impl_sdlrenderer.h"
@@ -130,7 +131,7 @@ class FurnaceGUI {
 
   String workingDir, fileName, clipboard, errorString, lastError;
 
-  bool quit, willCommit;
+  bool quit, willCommit, edit;
 
   FurnaceGUIFileDialogs curFileDialog;
 
@@ -160,6 +161,10 @@ class FurnaceGUI {
   bool selecting, curNibble, extraChannelButtons, followOrders, followPattern, changeAllOrders;
   FurnaceGUIWindows curWindow;
 
+  bool noteOffOnRelease;
+  SDL_Keycode noteOffOnReleaseKey;
+  int noteOffOnReleaseChan;
+
   std::map<SDL_Keycode,int> noteKeys;
   std::map<SDL_Keycode,int> valueKeys;