/* ------------------------------------------------------------
author: "Christopher Arndt"
copyright: "Christopher Arndt, 2024"
license: "MIT"
name: "FaustLPF"
version: "0.1.0"
Code generated with Faust 2.74.6 (https://faust.grame.fr)
Compilation options: -a ./examples/minarch.h -lang c -rui -ct 1 -cn faustlpf -es 1 -mcd 16 -mdd 1024 -mdy 33 -single -ftz 0 -vec -lv 0 -vs 32
------------------------------------------------------------ */

#ifndef  __faustlpf_H__
#define  __faustlpf_H__

/******************* BEGIN minarch.h ****************/

/************************************************************************
 FAUST Architecture File for generating a very minimal C interface
 ************************************************************************/

#include "faust/gui/CInterface.h"

/******************************************************************************
 VECTOR INTRINSICS
*******************************************************************************/


/**************************BEGIN USER SECTION **************************/

#ifndef FAUSTFLOAT
#define FAUSTFLOAT float
#endif 


#ifdef __cplusplus
extern "C" {
#endif

#if defined(_WIN32)
#define RESTRICT __restrict
#else
#define RESTRICT __restrict__
#endif

#include <math.h>
#include <stdint.h>
#include <stdlib.h>

static float faustlpf_faustpower2_f(float value) {
	return value * value;
}

#ifndef FAUSTCLASS 
#define FAUSTCLASS faustlpf
#endif

#ifdef __APPLE__ 
#define exp10f __exp10f
#define exp10 __exp10
#endif

typedef struct {
	int fSampleRate;
	float fConst0;
	float fConst1;
	float fConst2;
	FAUSTFLOAT fHslider0;
	float fRec1_perm[4];
	float fConst3;
	float fRec0_perm[4];
} faustlpf;

faustlpf* newfaustlpf() { 
	faustlpf* dsp = (faustlpf*)calloc(1, sizeof(faustlpf));
	return dsp;
}

void deletefaustlpf(faustlpf* dsp) { 
	free(dsp);
}

void metadatafaustlpf(MetaGlue* m) { 
	m->declare(m->metaInterface, "author", "Christopher Arndt");
	m->declare(m->metaInterface, "compile_options", "-a ./examples/minarch.h -lang c -rui -ct 1 -cn faustlpf -es 1 -mcd 16 -mdd 1024 -mdy 33 -single -ftz 0 -vec -lv 0 -vs 32");
	m->declare(m->metaInterface, "copyright", "Christopher Arndt, 2024");
	m->declare(m->metaInterface, "filename", "lpf.dsp");
	m->declare(m->metaInterface, "filters.lib/fir:author", "Julius O. Smith III");
	m->declare(m->metaInterface, "filters.lib/fir:copyright", "Copyright (C) 2003-2019 by Julius O. Smith III <jos@ccrma.stanford.edu>");
	m->declare(m->metaInterface, "filters.lib/fir:license", "MIT-style STK-4.3 license");
	m->declare(m->metaInterface, "filters.lib/iir:author", "Julius O. Smith III");
	m->declare(m->metaInterface, "filters.lib/iir:copyright", "Copyright (C) 2003-2019 by Julius O. Smith III <jos@ccrma.stanford.edu>");
	m->declare(m->metaInterface, "filters.lib/iir:license", "MIT-style STK-4.3 license");
	m->declare(m->metaInterface, "filters.lib/lowpass0_highpass1", "Copyright (C) 2003-2019 by Julius O. Smith III <jos@ccrma.stanford.edu>");
	m->declare(m->metaInterface, "filters.lib/lowpass0_highpass1:author", "Julius O. Smith III");
	m->declare(m->metaInterface, "filters.lib/lowpass:author", "Julius O. Smith III");
	m->declare(m->metaInterface, "filters.lib/lowpass:copyright", "Copyright (C) 2003-2019 by Julius O. Smith III <jos@ccrma.stanford.edu>");
	m->declare(m->metaInterface, "filters.lib/lowpass:license", "MIT-style STK-4.3 license");
	m->declare(m->metaInterface, "filters.lib/name", "Faust Filters Library");
	m->declare(m->metaInterface, "filters.lib/tf2:author", "Julius O. Smith III");
	m->declare(m->metaInterface, "filters.lib/tf2:copyright", "Copyright (C) 2003-2019 by Julius O. Smith III <jos@ccrma.stanford.edu>");
	m->declare(m->metaInterface, "filters.lib/tf2:license", "MIT-style STK-4.3 license");
	m->declare(m->metaInterface, "filters.lib/tf2s:author", "Julius O. Smith III");
	m->declare(m->metaInterface, "filters.lib/tf2s:copyright", "Copyright (C) 2003-2019 by Julius O. Smith III <jos@ccrma.stanford.edu>");
	m->declare(m->metaInterface, "filters.lib/tf2s:license", "MIT-style STK-4.3 license");
	m->declare(m->metaInterface, "filters.lib/version", "1.3.0");
	m->declare(m->metaInterface, "license", "MIT");
	m->declare(m->metaInterface, "maths.lib/author", "GRAME");
	m->declare(m->metaInterface, "maths.lib/copyright", "GRAME");
	m->declare(m->metaInterface, "maths.lib/license", "LGPL with exception");
	m->declare(m->metaInterface, "maths.lib/name", "Faust Math Library");
	m->declare(m->metaInterface, "maths.lib/version", "2.8.0");
	m->declare(m->metaInterface, "name", "FaustLPF");
	m->declare(m->metaInterface, "platform.lib/name", "Generic Platform Library");
	m->declare(m->metaInterface, "platform.lib/version", "1.3.0");
	m->declare(m->metaInterface, "signals.lib/name", "Faust Signal Routing Library");
	m->declare(m->metaInterface, "signals.lib/version", "1.5.0");
	m->declare(m->metaInterface, "version", "0.1.0");
}

int getSampleRatefaustlpf(faustlpf* RESTRICT dsp) {
	return dsp->fSampleRate;
}

int getNumInputsfaustlpf(faustlpf* RESTRICT dsp) {
	return 1;
}
int getNumOutputsfaustlpf(faustlpf* RESTRICT dsp) {
	return 1;
}

void classInitfaustlpf(int sample_rate) {
}

void instanceResetUserInterfacefaustlpf(faustlpf* dsp) {
	dsp->fHslider0 = (FAUSTFLOAT)(1.5e+04f);
}

void instanceClearfaustlpf(faustlpf* dsp) {
	/* C99 loop */
	{
		int l0;
		for (l0 = 0; l0 < 4; l0 = l0 + 1) {
			dsp->fRec1_perm[l0] = 0.0f;
		}
	}
	/* C99 loop */
	{
		int l1;
		for (l1 = 0; l1 < 4; l1 = l1 + 1) {
			dsp->fRec0_perm[l1] = 0.0f;
		}
	}
}

void instanceConstantsfaustlpf(faustlpf* dsp, int sample_rate) {
	dsp->fSampleRate = sample_rate;
	dsp->fConst0 = fminf(1.92e+05f, fmaxf(1.0f, (float)(dsp->fSampleRate)));
	dsp->fConst1 = 44.1f / dsp->fConst0;
	dsp->fConst2 = 1.0f - dsp->fConst1;
	dsp->fConst3 = 3.1415927f / dsp->fConst0;
}
	
void instanceInitfaustlpf(faustlpf* dsp, int sample_rate) {
	instanceConstantsfaustlpf(dsp, sample_rate);
	instanceResetUserInterfacefaustlpf(dsp);
	instanceClearfaustlpf(dsp);
}

void initfaustlpf(faustlpf* dsp, int sample_rate) {
	classInitfaustlpf(sample_rate);
	instanceInitfaustlpf(dsp, sample_rate);
}

void buildUserInterfacefaustlpf(faustlpf* dsp, UIGlue* ui_interface) {
	ui_interface->openVerticalBox(ui_interface->uiInterface, "FaustLPF");
	ui_interface->declare(ui_interface->uiInterface, &dsp->fHslider0, "1", "");
	ui_interface->declare(ui_interface->uiInterface, &dsp->fHslider0, "scale", "log");
	ui_interface->declare(ui_interface->uiInterface, &dsp->fHslider0, "style", "knob");
	ui_interface->declare(ui_interface->uiInterface, &dsp->fHslider0, "symbol", "cutoff");
	ui_interface->declare(ui_interface->uiInterface, &dsp->fHslider0, "tooltip", "Low-pass filter cutoff frequency");
	ui_interface->declare(ui_interface->uiInterface, &dsp->fHslider0, "unit", "Hz");
	ui_interface->addHorizontalSlider(ui_interface->uiInterface, "Cutoff", &dsp->fHslider0, (FAUSTFLOAT)1.5e+04f, (FAUSTFLOAT)16.0f, (FAUSTFLOAT)1.5e+04f, (FAUSTFLOAT)0.1f);
	ui_interface->closeBox(ui_interface->uiInterface);
}

void computefaustlpf(faustlpf* dsp, int count, FAUSTFLOAT** RESTRICT inputs, FAUSTFLOAT** RESTRICT outputs) {
	FAUSTFLOAT* input0_ptr = inputs[0];
	FAUSTFLOAT* output0_ptr = outputs[0];
	float fSlow0 = dsp->fConst1 * fmaxf(16.0f, fminf(1.5e+04f, (float)(dsp->fHslider0)));
	float fRec1_tmp[36];
	float* fRec1 = &fRec1_tmp[4];
	float fZec0[32];
	float fZec1[32];
	float fZec2[32];
	float fRec0_tmp[36];
	float* fRec0 = &fRec0_tmp[4];
	int vindex = 0;
	/* Main loop */
	for (vindex = 0; vindex <= (count - 32); vindex = vindex + 32) {
		FAUSTFLOAT* input0 = &input0_ptr[vindex];
		FAUSTFLOAT* output0 = &output0_ptr[vindex];
		int vsize = 32;
		/* Recursive loop 0 */
		/* Pre code */
		/* C99 loop */
		{
			int j0;
			for (j0 = 0; j0 < 4; j0 = j0 + 1) {
				fRec1_tmp[j0] = dsp->fRec1_perm[j0];
			}
		}
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				fRec1[i] = fSlow0 + dsp->fConst2 * fRec1[i - 1];
			}
		}
		/* Post code */
		/* C99 loop */
		{
			int j1;
			for (j1 = 0; j1 < 4; j1 = j1 + 1) {
				dsp->fRec1_perm[j1] = fRec1_tmp[vsize + j1];
			}
		}
		/* Vectorizable loop 1 */
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				fZec0[i] = tanf(dsp->fConst3 * fRec1[i]);
			}
		}
		/* Vectorizable loop 2 */
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				fZec1[i] = 1.0f / fZec0[i];
			}
		}
		/* Vectorizable loop 3 */
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				fZec2[i] = (fZec1[i] + 1.4142135f) / fZec0[i] + 1.0f;
			}
		}
		/* Recursive loop 4 */
		/* Pre code */
		/* C99 loop */
		{
			int j2;
			for (j2 = 0; j2 < 4; j2 = j2 + 1) {
				fRec0_tmp[j2] = dsp->fRec0_perm[j2];
			}
		}
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				fRec0[i] = (float)(input0[i]) - (fRec0[i - 2] * ((fZec1[i] + -1.4142135f) / fZec0[i] + 1.0f) + 2.0f * fRec0[i - 1] * (1.0f - 1.0f / faustlpf_faustpower2_f(fZec0[i]))) / fZec2[i];
			}
		}
		/* Post code */
		/* C99 loop */
		{
			int j3;
			for (j3 = 0; j3 < 4; j3 = j3 + 1) {
				dsp->fRec0_perm[j3] = fRec0_tmp[vsize + j3];
			}
		}
		/* Vectorizable loop 5 */
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				output0[i] = (FAUSTFLOAT)((fRec0[i - 2] + fRec0[i] + 2.0f * fRec0[i - 1]) / fZec2[i]);
			}
		}
	}
	/* Remaining frames */
	if (vindex < count) {
		FAUSTFLOAT* input0 = &input0_ptr[vindex];
		FAUSTFLOAT* output0 = &output0_ptr[vindex];
		int vsize = count - vindex;
		/* Recursive loop 0 */
		/* Pre code */
		/* C99 loop */
		{
			int j0;
			for (j0 = 0; j0 < 4; j0 = j0 + 1) {
				fRec1_tmp[j0] = dsp->fRec1_perm[j0];
			}
		}
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				fRec1[i] = fSlow0 + dsp->fConst2 * fRec1[i - 1];
			}
		}
		/* Post code */
		/* C99 loop */
		{
			int j1;
			for (j1 = 0; j1 < 4; j1 = j1 + 1) {
				dsp->fRec1_perm[j1] = fRec1_tmp[vsize + j1];
			}
		}
		/* Vectorizable loop 1 */
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				fZec0[i] = tanf(dsp->fConst3 * fRec1[i]);
			}
		}
		/* Vectorizable loop 2 */
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				fZec1[i] = 1.0f / fZec0[i];
			}
		}
		/* Vectorizable loop 3 */
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				fZec2[i] = (fZec1[i] + 1.4142135f) / fZec0[i] + 1.0f;
			}
		}
		/* Recursive loop 4 */
		/* Pre code */
		/* C99 loop */
		{
			int j2;
			for (j2 = 0; j2 < 4; j2 = j2 + 1) {
				fRec0_tmp[j2] = dsp->fRec0_perm[j2];
			}
		}
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				fRec0[i] = (float)(input0[i]) - (fRec0[i - 2] * ((fZec1[i] + -1.4142135f) / fZec0[i] + 1.0f) + 2.0f * fRec0[i - 1] * (1.0f - 1.0f / faustlpf_faustpower2_f(fZec0[i]))) / fZec2[i];
			}
		}
		/* Post code */
		/* C99 loop */
		{
			int j3;
			for (j3 = 0; j3 < 4; j3 = j3 + 1) {
				dsp->fRec0_perm[j3] = fRec0_tmp[vsize + j3];
			}
		}
		/* Vectorizable loop 5 */
		/* Compute code */
		/* C99 loop */
		{
			int i;
			for (i = 0; i < vsize; i = i + 1) {
				output0[i] = (FAUSTFLOAT)((fRec0[i - 2] + fRec0[i] + 2.0f * fRec0[i - 1]) / fZec2[i]);
			}
		}
	}
}

#ifdef __cplusplus
}
#endif

/***************************END USER SECTION ***************************/

#endif