spiralsynthmodular/SpiralSound/Plugins/WaveShaperPlugin/WaveShaperPlugin.C

/*  WaveShaper Plugin Copyleft (C) 2001 Yves Usson 
 *  for SpiralSynthModular
 *  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 "WaveShaperPlugin.h"
#include "WaveShaperPluginGUI.h"
#include <FL/Fl_Button.h>
#include "WaveShaperIcon.xpm"

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

char** GetIcon()
{
	return WaveShaperIcon_xpm;
}

int GetID()
{
	return 0x0032;
}
}

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

WaveShaperPlugin::WaveShaperPlugin()
{
	m_PluginInfo.Name="WaveShaper";
	m_PluginInfo.Width=278;
	m_PluginInfo.Height=260;
	m_PluginInfo.NumInputs=1;
	m_PluginInfo.NumOutputs=1;
	m_PluginInfo.PortTips.push_back("Input");	
	m_PluginInfo.PortTips.push_back("Out");
	wt = new float[512];
	for (int i=0;i<512;i++) wt[i] = (i / 256.0 - 1.0);
	m_Wave = 1;
	for (int i=0;i<6;i++) m_Coefs[i] = 0.0;
	m_Coefs[0] = 1.0;
}

WaveShaperPlugin::~WaveShaperPlugin()
{
	delete [] wt;
}

PluginInfo &WaveShaperPlugin::Initialise(const HostInfo *Host)
{	
	PluginInfo& Info = SpiralPlugin::Initialise(Host);
	Calc();
	return Info;
}

SpiralGUIType *WaveShaperPlugin::CreateGUI()
{
	m_GUI = new WaveShaperPluginGUI(m_PluginInfo.Width,
								  	    m_PluginInfo.Height,
										this,m_HostInfo);
	m_GUI->hide();
	return m_GUI;
}

void WaveShaperPlugin::Execute()
{
	float k1,k2;
	if (!InputExists(0)) return; 
	for (int i=0;i<m_HostInfo->BUFSIZE;i++)
	{
		float v = GetInput(0,i); 
		int index = (short)(256.0*v)+256;
	//	short rm = v - ((index-256)*(long)SpiralInfo::MAXSAMPLE)/256;
		if (index<0) index=0;
		if (index>511) index=511;
	//	k1 = rm / (SpiralInfo::MAXSAMPLE/256.0);
	//	v = (short)(k1*(wt[index]-wt[index+1])+wt[index+1]);
		SetOutput(0,i,wt[index]);
	}
}

void WaveShaperPlugin::Calc(void)

{
int i;
float xx,x,y,max;

	if (m_Wave)
	{
		max = 1.0;
		for (i=0;i<512;i++)
		{
			x = i / 256.0 - 1.0;
			y = 0;
			xx = x;
			for (int j=1; j<7; j++)
			{
				y += m_Coefs[j-1] * xx;
				xx *= x;
			}
			y = fabs(y);
			max = max > y? max:y;
		}
		for (i=0;i<512;i++)
		{
			x = i / 256.0 - 1.0;
			y = 0;
			xx = x;
			for (int j=1; j<7; j++)
			{
				y += m_Coefs[j-1] * xx;
				xx *= x;
			}
			y /= max;
			set(i,y);
		}
	}
	else
	{
		max = 1.0;
		for (i=0;i<512;i++)
		{
			x = (i / 256.0 - 1.0)*M_PI;
			y = 0;
			for (int j=1; j<7; j++)
				y += m_Coefs[j-1] * sin(x*(1+(j-1)*3));
			y = fabs(y);
			max = max > y? max:y;
		}
		for (i=0;i<512;i++)
		{
			x = (i / 256.0 - 1.0)*M_PI;
			y = 0;
			for (int j=1; j<7; j++)
				y += m_Coefs[j-1] * sin(x*(1+(j-1)*3));
			y /= max;
			set(i,y);
		}
	} 
}

float WaveShaperPlugin::Get(int index)

{
  if ((index < 0) || (index > 511)) return 0;
	return wt[index];
}

void WaveShaperPlugin::set(int index,float v)

{
  if ((index < 0) || (index > 511)) return;
	if (v > 1.0f) v = 1.0f;
	if (v < -1.0f) v = -1.0f;
	wt[index] = v;
}

void WaveShaperPlugin::SetCoef(int index,float v){
  if ((index < 0) || (index > 5)) return;
	m_Coefs[index] = v;
}

void WaveShaperPlugin::SetWaveType(int t){
  m_Wave = t;
}

float WaveShaperPlugin::GetCoef(int index){
  if ((index < 0) || (index > 5)) return 0;
	return m_Coefs[index];
}

int WaveShaperPlugin::GetWaveType(){
  return m_Wave;
}

void WaveShaperPlugin::StreamOut(ostream &s)
{
	s<<m_Version<<" "<<m_Wave;
	for (int i=0;i<6;i++) s<<" "<<m_Coefs[i];
}

void WaveShaperPlugin::StreamIn(istream &s)
{
	int version;
	s>>version>>m_Wave;
	for (int i=0;i<6;i++) s>>m_Coefs[i];
	Calc();
}