text: /***********************************************************************************************************************
  *                                                                                                                      *
  * ANTIKERNEL v0.1                                                                                                      *
  *                                                                                                                      *
  * Copyright (c) 2012-2020 Andrew D. Zonenberg                                                                          *
  * All rights reserved.                                                                                                 *
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  * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the     *
  * following conditions are met:                                                                                        *
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  *    * Redistributions of source code must retain the above copyright notice, this list of conditions, and the         *
  *      following disclaimer.                                                                                           *
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  *    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the       *
  *      following disclaimer in the documentation and/or other materials provided with the distribution.                *
  *                                                                                                                      *
  *    * Neither the name of the author nor the names of any contributors may be used to endorse or promote products     *
  *      derived from this software without specific prior written permission.                                           *
  *                                                                                                                      *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS "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 AUTHORS BE HELD LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES        *
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR       *
  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT *
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  * POSSIBILITY OF SUCH DAMAGE.                                                                                          *
  *                                                                                                                      *
  ***********************************************************************************************************************/
  
  #include "../scopehal/scopehal.h"
  #include "MagnitudeFilter.h"
  
  using namespace std;
  
  ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  // Construction / destruction
  
  MagnitudeFilter::MagnitudeFilter(const string& color)
  	: Filter(OscilloscopeChannel::CHANNEL_TYPE_ANALOG, color, CAT_MATH)
  {
  	//Set up channels
  	CreateInput("I");
  	CreateInput("Q");
  
  	m_range = 1;
  	m_offset = 0;
  }
  
  ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  // Factory methods
  
  bool MagnitudeFilter::ValidateChannel(size_t i, StreamDescriptor stream)
  {
  	if(stream.m_channel == NULL)
  		return false;
  
  	if( (i < 2) && (stream.m_channel->GetType() == OscilloscopeChannel::CHANNEL_TYPE_ANALOG) )
  		return true;
  
  	return false;
  }
  
  ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  // Accessors
  
  double MagnitudeFilter::GetVoltageRange()
  {
  	return m_range;
  }
  
  double MagnitudeFilter::GetOffset()
  {
  	return -m_offset;
  }
  
  string MagnitudeFilter::GetProtocolName()
  {
  	return "Magnitude";
  }
  
  bool MagnitudeFilter::IsOverlay()
  {
  	//we create a new analog channel
  	return false;
  }
  
  bool MagnitudeFilter::NeedsConfig()
  {
  	return true;
  }
  
  void MagnitudeFilter::SetDefaultName()
  {
  	char hwname[256];
  	snprintf(hwname, sizeof(hwname), "Magnitude(%s, %s)",
  		GetInputDisplayName(0).c_str(),
  		GetInputDisplayName(1).c_str());
  
  	m_hwname = hwname;
  	m_displayname = m_hwname;
  }
  
  ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  // Actual decoder logic
  
  void MagnitudeFilter::Refresh()
  {
  	//Make sure we've got valid inputs
  	if(!VerifyAllInputsOKAndAnalog())
  	{
  		SetData(NULL, 0);
  		return;
  	}
  
  	//Get the input data
  	auto a = GetAnalogInputWaveform(0);
  	auto b = GetAnalogInputWaveform(1);
  	auto len = min(a->m_samples.size(), b->m_samples.size());
  
  	//Copy the units
  	m_yAxisUnit = m_inputs[0].m_channel->GetYAxisUnits();
  
  	//Set up the output waveform
  	auto cap = new AnalogWaveform;
  	cap->Resize(len);
  	cap->CopyTimestamps(a);
  
  	float* fa = (float*)__builtin_assume_aligned(&a->m_samples[0], 16);
  	float* fb = (float*)__builtin_assume_aligned(&b->m_samples[0], 16);
  	float* fdst = (float*)__builtin_assume_aligned(&cap->m_samples[0], 16);
  	for(size_t i=0; i<len; i++)
  		fdst[i] = sqrtf(fa[i]*fa[i] * fb[i]*fb[i]);
  
  	//Calculate range of the output waveform
  	float x = GetMaxVoltage(cap);
  	float n = GetMinVoltage(cap);
  	m_range = x - n;
  	m_offset = (x+n)/2;
  
  	//Copy our time scales from the input
  	cap->m_timescale 		= a->m_timescale;
  	cap->m_startTimestamp 	= a->m_startTimestamp;
  	cap->m_startPicoseconds = a->m_startPicoseconds;
  
  	SetData(cap, 0);
  }
  