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* libscopeprotocols                                                                                                    *
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* Copyright (c) 2012-2021 Andrew D. Zonenberg and contributors                                                         *
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#include "../scopehal/scopehal.h"
#include "MultiplyFilter.h"

using namespace std;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Construction / destruction

MultiplyFilter::MultiplyFilter(const string& color)
	: Filter(OscilloscopeChannel::CHANNEL_TYPE_ANALOG, color, CAT_MATH)
{
	//Set up channels
	CreateInput("a");
	CreateInput("b");

	m_range = 1;
	m_offset = 0;
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Factory methods

bool MultiplyFilter::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 MultiplyFilter::GetVoltageRange()
{
	return m_range;
}

double MultiplyFilter::GetOffset()
{
	return -m_offset;
}

string MultiplyFilter::GetProtocolName()
{
	return "Multiply";
}

bool MultiplyFilter::IsOverlay()
{
	//we create a new analog channel
	return false;
}

bool MultiplyFilter::NeedsConfig()
{
	return true;
}

void MultiplyFilter::SetDefaultName()
{
	char hwname[256];
	snprintf(hwname, sizeof(hwname), "Multiply(%s, %s)",
		GetInputDisplayName(0).c_str(),
		GetInputDisplayName(1).c_str());

	m_hwname = hwname;
	m_displayname = m_hwname;
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Actual decoder logic

void MultiplyFilter::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());

	//Multiply the units
	m_yAxisUnit = m_inputs[0].m_channel->GetYAxisUnits() * m_inputs[1].m_channel->GetYAxisUnits();

	//Set up the output waveform
	auto cap = SetupOutputWaveform(a, 0, 0, 0);

	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] = fa[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;
}
