AudioGateVoice.java

/*
  AudioGateVoice.java

  (c) 2009-2015 Edward Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package v9t9.engine.sound;

import v9t9.common.cpu.ICpu;
import v9t9.common.machine.IMachine;
import v9t9.common.machine.IRegisterAccess.IRegisterWriteListener;
import v9t9.common.sound.TMS9919Consts;
import v9t9.engine.machine.BaseRegisterBank;
import ejs.base.settings.ISettingSection;
import ejs.base.utils.ListenerList;

/**
 * @author ejs
 *
 */
public class AudioGateVoice extends BaseRegisterBank {

	private boolean gate;
	private IMachine machine;
	private long lastCycles;

	public AudioGateVoice(String id, String name,
			ListenerList<IRegisterWriteListener> listeners, IMachine machine) {
		super(id, name, listeners);
		this.machine = machine;
	}

	public void setGate(boolean gate) {
		this.gate = gate;
		ICpu cpu = machine.getCpu();
		if (cpu != null) {
			long nowCycles = cpu.getTotalCurrentCycleCount();
			int cycles = (int) (nowCycles - lastCycles);
			lastCycles = nowCycles;
			fireRegisterChanged(baseReg + TMS9919Consts.REG_OFFS_AUDIO_GATE, gate ? cycles : -cycles-1);
		}
	}
	/* (non-Javadoc)
	 * @see v9t9.engine.sound.BaseVoice#loadState(ejs.base.settings.ISettingSection)
	 */
	@Override
	public void loadState(ISettingSection settings) {
		if (settings == null) return;
		setGate(settings.getBoolean("Gate"));
	}

	/* (non-Javadoc)
	 * @see v9t9.engine.sound.BaseVoice#saveState(ejs.base.settings.ISettingSection)
	 */
	@Override
	public void saveState(ISettingSection settings) {
		settings.put("Gate", gate);
	}

	/* (non-Javadoc)
	 * @see v9t9.engine.sound.BaseVoice#initRegisters(java.util.Map, java.util.Map, java.util.Map, int)
	 */
	@Override
	public int doInitRegisters() {
		register(baseReg + TMS9919Consts.REG_OFFS_AUDIO_GATE,
				getId() + ":G",
				getName());
		return TMS9919Consts.REG_COUNT_AUDIO_GATE;
	}
	
	/* (non-Javadoc)
	 * @see v9t9.engine.sound.IVoice#getRegister(int)
	 */
	@Override
	public int getRegister(int reg) {
		if (reg == baseReg + TMS9919Consts.REG_OFFS_AUDIO_GATE) {
			return gate ? 1 : 0;
		}
		return 0;
	}

	/* (non-Javadoc)
	 * @see v9t9.engine.sound.IVoice#setRegister(int, int)
	 */
	@Override
	public void setRegister(int reg, int newValue) {
		if (reg == baseReg + TMS9919Consts.REG_OFFS_AUDIO_GATE) {
			setGate(newValue != 0);
		}
	}
}