Implemented hasMidiProgramsChanged support.

Author: datajake1999

src/OPL3GM.cpp

@@ -50,6 +50,7 @@ OPL3GM::OPL3GM (audioMasterCallback audioMaster)
 	memset(&hi, 0, sizeof(hi));
 	memset(vu, 0, sizeof(vu));
 	CPULoad = 0;
+	memset(channelPrograms, 0, sizeof(channelPrograms));
 	initSynth ();
 	initBuffer ();
 #ifdef DEMO

src/OPL3GM.h

@@ -198,6 +198,7 @@ class OPL3GM : public AudioEffectX
 	LockableObject lock;
 	double vu[2];
 	double CPULoad;
+	VstInt32 channelPrograms[16];
 #ifdef DEMO
 	time_t startTime;
 #endif

src/midiprog.cpp

@@ -41,6 +41,7 @@ VstInt32 OPL3GM::getCurrentMidiProgram (VstInt32 channel, MidiProgramName* mpn)
 	if (synth)
 	{
 		prg = synth->midi_getprogram(channel);
+		channelPrograms[channel] = prg;
 	}
 	mpn->thisProgramIndex = prg;
 	fillProgram (channel, prg, mpn);
@@ -100,7 +101,16 @@ VstInt32 OPL3GM::getMidiProgramCategory (VstInt32 channel, MidiProgramCategory*
 
 bool OPL3GM::hasMidiProgramsChanged (VstInt32 channel)
 {
-	return false;	// updateDisplay ()
+	if (channel < 0 || channel >= 16)
+	return false;
+	if (synth)
+	{
+		if (synth->midi_getprogram(channel) != channelPrograms[channel])
+		{
+			return true;
+		}
+	}
+	return false;
 }
 
 bool OPL3GM::getMidiKeyName (VstInt32 channel, MidiKeyName* key)