GUI: prepare for drawing prev/next pat content

src/engine/engine.cpp

@@ -4851,6 +4851,20 @@ void* DivEngine::getDispatchChanState(int ch) {
   return disCont[dispatchOfChan[ch]].dispatch->getChanState(dispatchChanOfChan[ch]);
 }
 
+void DivEngine::enableCommandStream(bool enable) {
+  cmdStreamEnabled=enable;
+}
+
+void DivEngine::getCommandStream(std::vector<DivCommand>& where) {
+  isBusy.lock();
+  where.clear();
+  for (DivCommand& i: cmdStream) {
+    where.push_back(i);
+  }
+  cmdStream.clear();
+  isBusy.unlock();
+}
+
 void DivEngine::playSub(bool preserveDrift, int goalRow) {
   reset();
   if (preserveDrift && curOrder==0) return;
@@ -4900,6 +4914,7 @@ void DivEngine::playSub(bool preserveDrift, int goalRow) {
   if (!preserveDrift) {
     ticks=1;
   }
+  cmdStream.clear();
 }
 
 int DivEngine::calcBaseFreq(double clock, double divider, int note, bool period) {

src/engine/engine.h

@@ -170,6 +170,7 @@ class DivEngine {
   bool exporting;
   bool halted;
   bool forceMono;
+  bool cmdStreamEnabled;
   int ticks, curRow, curOrder, remainingLoops, nextSpeed, divider;
   int cycles, clockDrift, stepPlay;
   int changeOrd, changePos, totalSeconds, totalTicks, totalTicksR, totalCmds, lastCmds, cmdsPerSecond, globalPitch;
@@ -189,6 +190,7 @@ class DivEngine {
   String lastError;
   String warnings;
   std::vector<String> audioDevs;
+  std::vector<DivCommand> cmdStream;
 
   struct SamplePreview {
     int sample;
@@ -519,6 +521,12 @@ class DivEngine {
     // get dispatch channel state
     void* getDispatchChanState(int chan);
 
+    // enable command stream dumping
+    void enableCommandStream(bool enable);
+
+    // get command stream
+    void getCommandStream(std::vector<DivCommand>& where);
+
     // set the audio system.
     void setAudio(DivAudioEngines which);
 
@@ -622,6 +630,7 @@ class DivEngine {
       exporting(false),
       halted(false),
       forceMono(false),
+      cmdStreamEnabled(false),
       ticks(0),
       curRow(0),
       curOrder(0),

src/engine/playback.cpp

@@ -132,6 +132,9 @@ int DivEngine::dispatchCmd(DivCommand c) {
     printf("%8d | %d: %s(%d, %d)\n",totalTicksR,c.chan,cmdName[c.cmd],c.value,c.value2);
   }
   totalCmds++;
+  if (cmdStreamEnabled && cmdStream.size()<2000) {
+    cmdStream.push_back(c);
+  }
   c.chan=dispatchChanOfChan[c.dis];
   return disCont[dispatchOfChan[c.dis]].dispatch->dispatch(c);
 }