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/*
* Copyright 2009 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.ports;
import com.jsyn.unitgen.UnitGenerator;
import com.softsynth.shared.time.ScheduledCommand;
import com.softsynth.shared.time.TimeStamp;
public class UnitGatePort extends UnitInputPort {
private boolean autoDisableEnabled = false;
private boolean triggered = false;
private boolean off = true;
private UnitGenerator gatedUnit;
public static final double THRESHOLD = 0.01;
public UnitGatePort(String name) {
super(name);
}
public void on() {
setOn(true);
}
public void off() {
setOn(false);
}
public void off(TimeStamp timeStamp) {
setOn(false, timeStamp);
}
public void on(TimeStamp timeStamp) {
setOn(true, timeStamp);
}
private void setOn(final boolean on) {
queueCommand(new ScheduledCommand() {
@Override
public void run() {
setOnInternal(on);
}
});
}
private void setOn(final boolean on, TimeStamp timeStamp) {
scheduleCommand(timeStamp, new ScheduledCommand() {
@Override
public void run() {
setOnInternal(on);
}
});
}
private void setOnInternal(boolean on) {
if (on) {
triggerInternal();
}
setValueInternal(on ? 1.0 : 0.0);
}
private void triggerInternal() {
getGatedUnit().setEnabled(true);
triggered = true;
}
public void trigger() {
queueCommand(new ScheduledCommand() {
@Override
public void run() {
triggerInternal();
}
});
}
public void trigger(TimeStamp timeStamp) {
scheduleCommand(timeStamp, new ScheduledCommand() {
@Override
public void run() {
triggerInternal();
}
});
}
/**
* This is called by UnitGenerators. It sets the off value that can be tested using isOff().
*
* @param i
* @return true if triggered by a positive edge.
*/
public boolean checkGate(int i) {
double[] inputs = getValues();
boolean result = triggered;
triggered = false;
if (off) {
if (inputs[i] >= THRESHOLD) {
result = true;
off = false;
}
} else {
if (inputs[i] < THRESHOLD) {
off = true;
}
}
return result;
}
public boolean isOff() {
return off;
}
public boolean isAutoDisableEnabled() {
return autoDisableEnabled;
}
/**
* Request the containing UnitGenerator be disabled when checkAutoDisabled() is called. This can
* be used to reduce CPU load.
*
* @param autoDisableEnabled
*/
public void setAutoDisableEnabled(boolean autoDisableEnabled) {
this.autoDisableEnabled = autoDisableEnabled;
}
/**
* Called by UnitGenerator when an envelope reaches the end of its contour.
*/
public void checkAutoDisable() {
if (autoDisableEnabled) {
getGatedUnit().setEnabled(false);
}
}
private UnitGenerator getGatedUnit() {
return (gatedUnit == null) ? getUnitGenerator() : gatedUnit;
}
public void setupAutoDisable(UnitGenerator unit) {
gatedUnit = unit;
setAutoDisableEnabled(true);
// Start off disabled so we don't immediately swamp the CPU.
gatedUnit.setEnabled(false);
}
}
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