more SMS work

it is able to play some modules... the next step is to bind this to the
Genesis platform

src/engine/macroInt.cpp

@@ -0,0 +1,88 @@
+#include "macroInt.h"
+
+void DivMacroInt::next() {
+  if (ins==NULL) return;
+
+  hadVol=hasVol;
+  if (hasVol) {
+    vol=ins->std.volMacro[volPos++];
+    if (volPos>=ins->std.volMacroLen) {
+      if (ins->std.volMacroLoop>=0) {
+        volPos=ins->std.volMacroLoop;
+      } else {
+        hasVol=false;
+      }
+    }
+  }
+
+  hadArp=hasArp;
+  if (hasArp) {
+    arp=ins->std.arpMacro[arpPos++];
+    if (arpPos>=ins->std.arpMacroLen) {
+      if (ins->std.arpMacroLoop>=0) {
+        arpPos=ins->std.arpMacroLoop;
+      } else {
+        hasArp=false;
+      }
+    }
+  }
+
+  hadDuty=hasDuty;
+  if (hasDuty) {
+    duty=ins->std.dutyMacro[dutyPos++];
+    if (dutyPos>=ins->std.dutyMacroLen) {
+      if (ins->std.dutyMacroLoop>=0) {
+        dutyPos=ins->std.dutyMacroLoop;
+      } else {
+        hasDuty=false;
+      }
+    }
+  }
+
+  hadWave=hasWave;
+  if (hasWave) {
+    wave=ins->std.waveMacro[wavePos++];
+    if (wavePos>=ins->std.waveMacroLen) {
+      if (ins->std.waveMacroLoop>=0) {
+        wavePos=ins->std.waveMacroLoop;
+      } else {
+        hasWave=false;
+      }
+    }
+  }
+}
+
+void DivMacroInt::init(DivInstrument* which) {
+  ins=which;
+  volPos=0;
+  arpPos=0;
+  dutyPos=0;
+  wavePos=0;
+  hasVol=false;
+  hasArp=false;
+  hasDuty=false;
+  hasWave=false;
+  hadVol=false;
+  hadArp=false;
+  hadDuty=false;
+  hadWave=false;
+
+  if (ins==NULL) return;
+
+  if (ins->std.volMacroLen>0) {
+    hadVol=true;
+    hasVol=true;
+  }
+  if (ins->std.arpMacroLen>0) {
+    hadArp=true;
+    hasArp=true;
+  }
+  if (ins->std.dutyMacroLen>0) {
+    hadDuty=true;
+    hasDuty=true;
+  }
+  if (ins->std.waveMacroLen>0) {
+    hadWave=true;
+    hasWave=true;
+  }
+}