spiralsynthmodular/SpiralSound/Plugins/EchoPlugin/EchoPlugin.C

/*  SpiralSound
 *  Copyleft (C) 2001 David Griffiths <dave@pawfal.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/ 
#include "EchoPlugin.h"
#include "EchoPluginGUI.h"
#include <FL/Fl_Button.h>
#include "SpiralIcon.xpm"

static const float MAX_DELAY=1.0f;

extern "C" {
SpiralPlugin* CreateInstance()
{
	return new EchoPlugin;
}

char** GetIcon()
{
	return SpiralIcon_xpm;
}

int GetID()
{
	return 0x000e;
}
}

///////////////////////////////////////////////////////

EchoPlugin::EchoPlugin() :
m_Delay(0.75),
m_Feedback(0.4),
m_HeadPos(0)
{
	m_PluginInfo.Name="Echo";
	m_PluginInfo.Width=120;
	m_PluginInfo.Height=110;
	m_PluginInfo.NumInputs=3;
	m_PluginInfo.NumOutputs=1;
	m_PluginInfo.PortTips.push_back("Input");	
	m_PluginInfo.PortTips.push_back("Delay CV");	
	m_PluginInfo.PortTips.push_back("Feedback CV");	
	m_PluginInfo.PortTips.push_back("Output");
	
	m_AudioCH->Register("Delay",&m_Delay);
	m_AudioCH->Register("Feedback",&m_Feedback);
}

EchoPlugin::~EchoPlugin()
{
}

PluginInfo &EchoPlugin::Initialise(const HostInfo *Host)
{	
	PluginInfo& Info = SpiralPlugin::Initialise(Host);
	m_Buffer.Allocate((int)(m_HostInfo->SAMPLERATE*MAX_DELAY));
	return Info;
}

SpiralGUIType *EchoPlugin::CreateGUI()
{
	return new EchoPluginGUI(m_PluginInfo.Width,
								  	    m_PluginInfo.Height,
										this,m_AudioCH,m_HostInfo);
}

void EchoPlugin::Execute()
{
	float Delay;
	
    for (int n=0; n<m_HostInfo->BUFSIZE; n++)
	{
		Delay=(m_Delay+GetInput(1,n)*0.5)*(float)m_HostInfo->SAMPLERATE-1;
		
		if (Delay>=MAX_DELAY*m_HostInfo->SAMPLERATE) 
		{
			Delay=(MAX_DELAY*m_HostInfo->SAMPLERATE)-1;		
		}
		
		if (Delay<0) Delay=0;
		
		if (m_HeadPos>Delay)
		{
			m_HeadPos=0;
		}

		// Write to the buffer	
		m_Buffer.Set(m_HeadPos,GetInput(0,n)+(m_Buffer[m_HeadPos]*(m_Feedback+GetInput(2,n))));	 

		// Read from the buffer
		SetOutput(0,n,m_Buffer[m_HeadPos]);	 
		
		m_HeadPos++;	
	}
		
}
	
void EchoPlugin::Randomise()
{
}
	
void EchoPlugin::StreamOut(ostream &s)
{
	s<<m_Version<<" "<<m_Delay<<" "<<m_Feedback<<" ";
}

void EchoPlugin::StreamIn(istream &s)
{	
	int version;
	s>>version;
	s>>m_Delay>>m_Feedback;
}