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* libscopeprotocols                                                                                                    *
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/**
	@file
	@author Andrew D. Zonenberg
	@brief Declaration of FIRFilter
 */
#ifndef FIRFilter_h
#define FIRFilter_h

struct FIRFilterArgs
{
	uint32_t end;
	uint32_t filterlen;
};

/**
	@brief Performs an arbitrary FIR filter with tap delay equal to the sample rate
 */
class FIRFilter : public Filter
{
public:
	FIRFilter(const std::string& color);

	virtual void Refresh(vk::raii::CommandBuffer& cmdBuf, std::shared_ptr<QueueHandle> queue) override;
	virtual DataLocation GetInputLocation() override;

	static std::string GetProtocolName();
	virtual void SetDefaultName() override;

	virtual bool ValidateChannel(size_t i, StreamDescriptor stream) override;

	PROTOCOL_DECODER_INITPROC(FIRFilter)

	void DoFilterKernel(
		vk::raii::CommandBuffer& cmdBuf,
		std::shared_ptr<QueueHandle> queue,
		UniformAnalogWaveform* din,
		UniformAnalogWaveform* cap);

	enum FilterType
	{
		FILTER_TYPE_LOWPASS,
		FILTER_TYPE_HIGHPASS,
		FILTER_TYPE_BANDPASS,
		FILTER_TYPE_NOTCH
	};

	FilterType GetFilterType()
	{ return static_cast<FilterType>(m_parameters[m_filterTypeName].GetIntVal()); }

	void SetFilterType(FilterType type)
	{ m_parameters[m_filterTypeName].SetIntVal(type); }

	void SetFreqLow(float freq)
	{ m_parameters[m_freqLowName].SetFloatVal(freq); }

	void SetFreqHigh(float freq)
	{ m_parameters[m_freqHighName].SetFloatVal(freq); }

protected:

	void CalculateFilterCoefficients(float fa, float fb, float stopbandAtten, FilterType type);

	static float Bessel(float x);

	void DoFilterKernelGeneric(
		UniformAnalogWaveform* din,
		UniformAnalogWaveform* cap);

#ifdef __x86_64__
	void DoFilterKernelAVX2(
		UniformAnalogWaveform* din,
		UniformAnalogWaveform* cap);

	void DoFilterKernelAVX512F(
		UniformAnalogWaveform* din,
		UniformAnalogWaveform* cap);
#endif

	std::string m_filterTypeName;
	std::string m_filterLengthName;
	std::string m_stopbandAttenName;
	std::string m_freqLowName;
	std::string m_freqHighName;

	ComputePipeline m_computePipeline;

	AcceleratorBuffer<float> m_coefficients;
};

#endif
