internal static InstrumentRegion[] Create(Instrument instrument, Span <Zone> zones, SampleHeader[] samples)
{
Zone global = null;
// Is the first one the global zone?
if (zones[0].Generators.Length == 0 || zones[0].Generators.Last().Type != GeneratorType.SampleID)
{
// The first one is the global zone.
global = zones[0];
}
if (global != null)
{
// The global zone is regarded as the base setting of subsequent zones.
var regions = new InstrumentRegion[zones.Length - 1];
for (var i = 0; i < regions.Length; i++)
{
regions[i] = new InstrumentRegion(instrument, global.Generators, zones[i + 1].Generators, samples);
}
return(regions);
}
else
{
// No global zone.
var regions = new InstrumentRegion[zones.Length];
for (var i = 0; i < regions.Length; i++)
{
regions[i] = new InstrumentRegion(instrument, null, zones[i].Generators, samples);
}
return(regions);
}
}
public Voice RequestNew(InstrumentRegion region, int channel)
{
Voice free = null;
Voice low = null;
var lowestPriority = float.MaxValue;
var exclusiveClass = region.ExclusiveClass;
if (exclusiveClass == 0)
{
for (var i = 0; i < activeVoiceCount; i++)
{
var voice = voices[i];
if (voice.Priority < lowestPriority)
{
lowestPriority = voice.Priority;
low = voice;
}
}
}
else
{
for (var i = 0; i < activeVoiceCount; i++)
{
var voice = voices[i];
if (voice.ExclusiveClass == exclusiveClass && voice.Channel == channel)
{
voice.Kill();
free = voice;
}
if (voice.Priority < lowestPriority)
{
lowestPriority = voice.Priority;
low = voice;
}
}
}
if (free != null)
{
return(free);
}
if (activeVoiceCount < voices.Length)
{
free = voices[activeVoiceCount];
activeVoiceCount++;
return(free);
}
else
{
return(low);
}
}
private Instrument(InstrumentInfo info, Zone[] zones, SampleHeader[] samples)
{
this.name = info.Name;
var zoneCount = info.ZoneEndIndex - info.ZoneStartIndex + 1;
if (zoneCount <= 0)
{
throw new InvalidDataException($"The instrument '{info.Name}' has no zone.");
}
var zoneSpan = zones.AsSpan(info.ZoneStartIndex, zoneCount);
regions = InstrumentRegion.Create(this, zoneSpan, samples);
}
public static void StartModulation(this Lfo lfo, InstrumentRegion region, int key, int velocity)
{
StartModulation(lfo, new RegionPair(PresetRegion.Default, region), key, velocity);
}
public static void Start(this Oscillator oscillator, short[] data, InstrumentRegion region)
{
Start(oscillator, data, new RegionPair(PresetRegion.Default, region));
}
public static void Start(this ModulationEnvelope envelope, InstrumentRegion region, int key, int velocity)
{
Start(envelope, new RegionPair(PresetRegion.Default, region), key, velocity);
}
internal RegionPair(PresetRegion preset, InstrumentRegion instrument)
{
this.preset = preset;
this.instrument = instrument;
}