trunk/slmml/Oscillator.cs

/*
 Copyright (c) 2009, hkrn All rights reserved.
 
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 modification, are permitted provided that the following conditions are met:
 
 Redistributions of source code must retain the above copyright notice, this
 list of conditions and the following disclaimer. Redistributions in binary
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 the following disclaimer in the documentation and/or other materials
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 the names of its contributors may be used to endorse or promote products
 derived from this software without specific prior written permission. 
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 */

//
// $Id$
//

using System;
using SlMML.Modulators;

namespace SlMML
{
    public enum OscillatorForm
    {
        Sine,
        Saw,
        Triangle,
        Pulse,
        Noise,
        FCPulse,
        FCTriangle,
        FCNoise,
        FCShortNoise,
        FCDPCM,
        GBWave,
        GBLongNoise,
        GBShortNoise,
        Max
    }
    
    /// <summary>
    /// ���������������������������������������������������������������������������������
    /// </summary>
    public class Oscillator
    {
        #region ���������������������������������������������������������
        public Oscillator()
        {
            m_modulators = new IModulator[(int)OscillatorForm.Max];
            m_modulators[(int)OscillatorForm.Sine] = new Sine();
            m_modulators[(int)OscillatorForm.Saw] = new Saw();
            m_modulators[(int)OscillatorForm.Triangle] = new Triangle();
            m_modulators[(int)OscillatorForm.Pulse] = new Pulse();
            m_modulators[(int)OscillatorForm.Noise] = new Noise();
            m_modulators[(int)OscillatorForm.FCPulse] = new Pulse();
            m_modulators[(int)OscillatorForm.FCTriangle] = new FCTriangle();
            m_modulators[(int)OscillatorForm.FCNoise] = new FCNoise();
            m_modulators[(int)OscillatorForm.FCShortNoise] = new FCNoise();
            m_modulators[(int)OscillatorForm.FCDPCM] = new FCDPCM();
            m_modulators[(int)OscillatorForm.GBWave] = new GBWave();
            m_modulators[(int)OscillatorForm.GBLongNoise] = new GBLongNoise();
            m_modulators[(int)OscillatorForm.GBShortNoise] = new GBShortNoise();
            Form = OscillatorForm.Pulse;
        }
        #endregion

        #region ���������������������������
        /// <summary>
        /// ������������������������������������������������������������������������������������������
        /// </summary>
        /// <param name="form"></param>
        /// <returns></returns>
        public IModulator ModulatorFromForm(OscillatorForm form)
        {
            int index = Math.Min(Math.Max((int)form, 0), (int)(OscillatorForm.Max - 1));
            return m_modulators[index];
        }
        
        /// <summary>
        /// ������������������������������LFO���������������������������������������������
        /// </summary>
        public void MakeAsLFO()
        {
            if (m_modulators[(int)OscillatorForm.Noise] != null)
            {
                Noise noise = (Noise)m_modulators[(int)OscillatorForm.Noise];
                noise.ShouldResetPhase = false;
            }
        }
        #endregion

        #region ������������������������������
        /// <summary>
        /// ���������������������������������������������
        /// </summary>
        public OscillatorForm Form
        {
            set
            {
                int index = Math.Min(Math.Max((int)value, 0), (int)(OscillatorForm.Max - 1));
                m_form = (OscillatorForm)index;
                switch (m_form)
                {
                    case OscillatorForm.Noise:
                        Noise noise = (Noise)m_modulators[(int)OscillatorForm.Noise];
                        noise.RestoreFrequency();
                        break;
                    case OscillatorForm.FCNoise:
                        FCNoise fcNoise = (FCNoise)m_modulators[(int)OscillatorForm.FCNoise];
                        fcNoise.SetLongMode();
                        break;
                    case OscillatorForm.FCShortNoise:
                        FCNoise fcShortNoise = (FCNoise)m_modulators[(int)OscillatorForm.FCShortNoise];
                        fcShortNoise.SetShortMode();
                        break;
                    default:
                        break;
                }
            }
            get
            {
                return m_form;
            }
        }
        
        /// <summary>
        /// ���������������������������������������������������������������������������������������������������
        /// </summary>
        public IModulator CurrentModulator
        {
            get
            {
                return m_modulators[(int)Form];
            }
        }
        #endregion

        #region ���������������������������
        IModulator[] m_modulators;
        OscillatorForm m_form;
        #endregion
    }
}