d_osc.c

/* Copyright (c) 1997-1999 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */

/* sinusoidal oscillator and table lookup; see also tabosc4~ in d_array.c.
*/

#include "m_pd.h"
#include "math.h"

#define BIGFLOAT 1.0e+19
#define UNITBIT32 1572864.  /* 3*2^19; bit 32 has place value 1 */


#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__FreeBSD_kernel__) \
    || defined(__OpenBSD__)
#include <machine/endian.h>
#endif

#if defined(__linux__) || defined(__CYGWIN__) || defined(__GNU__) || \
    defined(ANDROID)
#include <endian.h>
#endif

#ifdef __MINGW32__
#include <sys/param.h>
#endif

#ifdef _MSC_VER
/* _MSVC lacks BYTE_ORDER and LITTLE_ENDIAN */
#define LITTLE_ENDIAN 0x0001
#define BYTE_ORDER LITTLE_ENDIAN
#endif

#if !defined(BYTE_ORDER) || !defined(LITTLE_ENDIAN)
#error No byte order defined
#endif

#if BYTE_ORDER == LITTLE_ENDIAN
# define HIOFFSET 1
# define LOWOFFSET 0
#else
# define HIOFFSET 0    /* word offset to find MSB */
# define LOWOFFSET 1    /* word offset to find LSB */
#endif

union tabfudge
{
    double tf_d;
    int32_t tf_i[2];
};

/* -------------------------- phasor~ ------------------------------ */
static t_class *phasor_class;

#if 1   /* in the style of R. Hoeldrich (ICMC 1995 Banff) */

typedef struct _phasor
{
    t_object x_obj;
    double x_phase;
    t_float x_conv;
    t_float x_f;						// scalar frequency
} t_phasor;

static void *phasor_new(t_floatarg f)
{
    t_phasor *x = (t_phasor *)pd_new(phasor_class);
    x->x_f = f;
    inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
    x->x_phase = 0;
    x->x_conv = 0;
    outlet_new(&x->x_obj, gensym("signal"));
    return (x);
}

static t_int *phasor_perform(t_int *w)
{
    t_phasor *x = (t_phasor *)(w[1]);
    t_sample *in = (t_float *)(w[2]);
    t_sample *out = (t_float *)(w[3]);
    int n = (int)(w[4]);
    double dphase = x->x_phase + (double)UNITBIT32;
    union tabfudge tf;
    int normhipart;
    t_float conv = x->x_conv;

    tf.tf_d = UNITBIT32;
    normhipart = tf.tf_i[HIOFFSET];
    tf.tf_d = dphase;

    while (n--)
    {
        tf.tf_i[HIOFFSET] = normhipart;
        dphase += *in++ * conv;
        *out++ = tf.tf_d - UNITBIT32;
        tf.tf_d = dphase;
    }
    tf.tf_i[HIOFFSET] = normhipart;
    x->x_phase = tf.tf_d - UNITBIT32;
    return (w+5);
}

static void phasor_dsp(t_phasor *x, t_signal **sp)
{
    x->x_conv = 1./sp[0]->s_sr;
    dsp_add(phasor_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, (t_int)sp[0]->s_n);
}

static void phasor_ft1(t_phasor *x, t_float f)
{
    x->x_phase = (double)f;
}

static void phasor_setup(void)
{
    phasor_class = class_new(gensym("phasor~"), (t_newmethod)phasor_new, 0,
        sizeof(t_phasor), 0, A_DEFFLOAT, 0);
    CLASS_MAINSIGNALIN(phasor_class, t_phasor, x_f);
    class_addmethod(phasor_class, (t_method)phasor_dsp,
        gensym("dsp"), A_CANT, 0);
    class_addmethod(phasor_class, (t_method)phasor_ft1,
        gensym("ft1"), A_FLOAT, 0);
}

#endif  /* Hoeldrich version */

/* ------------------------ cos~ ----------------------------- */

float *cos_table;

static t_class *cos_class;

typedef struct _cos
{
    t_object x_obj;
    t_float x_f;			// scalar frequency
} t_cos;

static void *cos_new(t_floatarg f)
{
    t_cos *x = (t_cos *)pd_new(cos_class);
    outlet_new(&x->x_obj, gensym("signal"));
    x->x_f = f;
    return (x);
}

static t_int *cos_perform(t_int *w)
{
    t_sample *in = (t_sample *)(w[1]);
    t_sample *out = (t_sample *)(w[2]);
    int n = (int)(w[3]);
    float *tab = cos_table, *addr;
    t_float f1, f2, frac;
    double dphase;
    int normhipart;
    union tabfudge tf;

    tf.tf_d = UNITBIT32;
    normhipart = tf.tf_i[HIOFFSET];

#if 0           /* this is the readable version of the code. */
    while (n--)
    {
        dphase = (double)(*in++ * (float)(COSTABSIZE)) + UNITBIT32;
        tf.tf_d = dphase;
        addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
        tf.tf_i[HIOFFSET] = normhipart;
        frac = tf.tf_d - UNITBIT32;
        f1 = addr[0];
        f2 = addr[1];
        *out++ = f1 + frac * (f2 - f1);
    }
#endif
#if 1           /* this is the same, unwrapped by hand. */
        dphase = (double)(*in++ * (float)(COSTABSIZE)) + UNITBIT32;
        tf.tf_d = dphase;
        addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
        tf.tf_i[HIOFFSET] = normhipart;
    while (--n)
    {
        dphase = (double)(*in++ * (float)(COSTABSIZE)) + UNITBIT32;
            frac = tf.tf_d - UNITBIT32;
        tf.tf_d = dphase;
            f1 = addr[0];
            f2 = addr[1];
        addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
            *out++ = f1 + frac * (f2 - f1);
        tf.tf_i[HIOFFSET] = normhipart;
    }
            frac = tf.tf_d - UNITBIT32;
            f1 = addr[0];
            f2 = addr[1];
            *out++ = f1 + frac * (f2 - f1);
#endif
    return (w+4);
}

static void cos_dsp(t_cos *x, t_signal **sp)
{
    dsp_add(cos_perform, 3, sp[0]->s_vec, sp[1]->s_vec, (t_int)sp[0]->s_n);
}

static void cos_maketable(void)
{
    int i;
    float *fp, phase, phsinc = (2. * 3.14159) / COSTABSIZE;
    union tabfudge tf;

    if (cos_table) return;
    cos_table = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
    for (i = COSTABSIZE + 1, fp = cos_table, phase = 0; i--;
        fp++, phase += phsinc)
            *fp = cos(phase);

        /* here we check at startup whether the byte alignment
            is as we declared it.  If not, the code has to be
            recompiled the other way. */
    tf.tf_d = UNITBIT32 + 0.5;
    if ((unsigned)tf.tf_i[LOWOFFSET] != 0x80000000)
        bug("cos~: unexpected machine alignment");
}

static void cos_cleanup(t_class *c)
{
    freebytes(cos_table, sizeof(float) * (COSTABSIZE+1));
    cos_table = 0;
}

static void cos_setup(void)
{
    cos_class = class_new(gensym("cos~"), (t_newmethod)cos_new, 0,
        sizeof(t_cos), 0, A_DEFFLOAT, 0);
    class_setfreefn(cos_class, cos_cleanup);
    CLASS_MAINSIGNALIN(cos_class, t_cos, x_f);
    class_addmethod(cos_class, (t_method)cos_dsp, gensym("dsp"), A_CANT, 0);
    cos_maketable();
}

/* ------------------------ osc~ ----------------------------- */

static t_class *osc_class, *scalarosc_class;

typedef struct _osc
{
    t_object x_obj;
    double x_phase;
    t_float x_conv;
    t_float x_f;						// scalar frequency
} t_osc;

static void *osc_new(t_floatarg f)
{
    t_osc *x = (t_osc *)pd_new(osc_class);
    x->x_f = f;
    outlet_new(&x->x_obj, gensym("signal"));
    inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
    x->x_phase = 0;
    x->x_conv = 0;
    return (x);
}

static t_int *osc_perform(t_int *w)
{
    t_osc *x = (t_osc *)(w[1]);
    t_sample *in = (t_sample *)(w[2]);
    t_sample *out = (t_sample *)(w[3]);
    int n = (int)(w[4]);
    float *tab = cos_table, *addr;
    t_float f1, f2, frac;
    double dphase = x->x_phase + UNITBIT32;
    int normhipart;
    union tabfudge tf;
    float conv = x->x_conv;

    tf.tf_d = UNITBIT32;
    normhipart = tf.tf_i[HIOFFSET];
#if 0
    while (n--)
    {
        tf.tf_d = dphase;
        dphase += *in++ * conv;
        addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
        tf.tf_i[HIOFFSET] = normhipart;
        frac = tf.tf_d - UNITBIT32;
        f1 = addr[0];
        f2 = addr[1];
        *out++ = f1 + frac * (f2 - f1);
    }
#endif
#if 1
        tf.tf_d = dphase;
        dphase += *in++ * conv;
        addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
        tf.tf_i[HIOFFSET] = normhipart;
        frac = tf.tf_d - UNITBIT32;
    while (--n)
    {
        tf.tf_d = dphase;
            f1 = addr[0];
        dphase += *in++ * conv;
            f2 = addr[1];
        addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
        tf.tf_i[HIOFFSET] = normhipart;
            *out++ = f1 + frac * (f2 - f1);
        frac = tf.tf_d - UNITBIT32;
    }
            f1 = addr[0];
            f2 = addr[1];
            *out++ = f1 + frac * (f2 - f1);
#endif

    tf.tf_d = UNITBIT32 * COSTABSIZE;
    normhipart = tf.tf_i[HIOFFSET];
    tf.tf_d = dphase + (UNITBIT32 * COSTABSIZE - UNITBIT32);
    tf.tf_i[HIOFFSET] = normhipart;
    x->x_phase = tf.tf_d - UNITBIT32 * COSTABSIZE;
    return (w+5);
}

static void osc_dsp(t_osc *x, t_signal **sp)
{
    x->x_conv = COSTABSIZE/sp[0]->s_sr;
    dsp_add(osc_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, (t_int)sp[0]->s_n);
}

static void osc_ft1(t_osc *x, t_float f)
{
    x->x_phase = COSTABSIZE * f;
}

static void osc_setup(void)
{
    osc_class = class_new(gensym("osc~"), (t_newmethod)osc_new, 0,
        sizeof(t_osc), 0, A_DEFFLOAT, 0);
    CLASS_MAINSIGNALIN(osc_class, t_osc, x_f);
    class_addmethod(osc_class, (t_method)osc_dsp, gensym("dsp"), A_CANT, 0);
    class_addmethod(osc_class, (t_method)osc_ft1, gensym("ft1"), A_FLOAT, 0);

    cos_maketable();
}

/* ---- vcf~ - resonant filter with audio-rate center frequency input ----- */

typedef struct vcfctl
{
    t_float c_re;
    t_float c_im;
    t_float c_q;
    t_float c_isr;
} t_vcfctl;

typedef struct sigvcf
{
    t_object x_obj;
    t_vcfctl x_cspace;
    t_vcfctl *x_ctl;
    t_float x_f;
} t_sigvcf;

t_class *sigvcf_class;

static void *sigvcf_new(t_floatarg q)
{
    t_sigvcf *x = (t_sigvcf *)pd_new(sigvcf_class);
    inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
    inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft1"));
    outlet_new(&x->x_obj, gensym("signal"));
    outlet_new(&x->x_obj, gensym("signal"));
    x->x_ctl = &x->x_cspace;
    x->x_cspace.c_re = 0;
    x->x_cspace.c_im = 0;
    x->x_cspace.c_q = q;
    x->x_cspace.c_isr = 0;
    x->x_f = 0;
    return (x);
}

static void sigvcf_ft1(t_sigvcf *x, t_float f)
{
    if(f < 0.) f = 0.;
    if(f > BIGFLOAT) f = BIGFLOAT;
    x->x_ctl->c_q = f;
}

static t_int *sigvcf_perform(t_int *w)
{
    t_sample *in1 = (t_sample *)(w[1]);
    t_sample *in2 = (t_sample *)(w[2]);
    t_sample *out1 = (t_sample *)(w[3]);
    t_sample *out2 = (t_sample *)(w[4]);
    t_vcfctl *c = (t_vcfctl *)(w[5]);
    int n = (int)w[6];
    int i;
    t_float re = c->c_re, re2;
    t_float im = c->c_im;
    t_float q = c->c_q;
    t_float isr = c->c_isr;
    t_float qinv = (q > 0? 1.0f/q : 0);
    t_float ampcorrect = 2. - 2. / (q + 2.);
    t_float coefr, coefi;
    float *tab = cos_table, *addr, f1, f2, frac;
    double dphase;
    int normhipart, tabindex;
    union tabfudge tf;

    tf.tf_d = UNITBIT32;
    normhipart = tf.tf_i[HIOFFSET];

    for (i = 0; i < n; i++)
    {
        float cf, cfindx, r, oneminusr;
        cf = *in2++ * isr;
        if (cf < 0) cf = 0;
        cfindx = cf * (float)(COSTABSIZE/6.28318f);
        r = (qinv > 0 ? 1 - cf * qinv : 0);
        if (r < 0) r = 0;
        oneminusr = 1.0f - r;
        dphase = ((double)(cfindx)) + UNITBIT32;
        tf.tf_d = dphase;
        tabindex = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
        addr = tab + tabindex;
        tf.tf_i[HIOFFSET] = normhipart;
        frac = tf.tf_d - UNITBIT32;
        f1 = addr[0];
        f2 = addr[1];
        coefr = r * (f1 + frac * (f2 - f1));

        addr = tab + ((tabindex - (COSTABSIZE/4)) & (COSTABSIZE-1));
        f1 = addr[0];
        f2 = addr[1];
        coefi = r * (f1 + frac * (f2 - f1));

        f1 = *in1++;
        re2 = re;
        *out1++ = re = ampcorrect * oneminusr * f1
            + coefr * re2 - coefi * im;
        *out2++ = im = coefi * re2 + coefr * im;
    }
    if (PD_BIGORSMALL(re))
        re = 0;
    if (PD_BIGORSMALL(im))
        im = 0;
    c->c_re = re;
    c->c_im = im;
    return (w+7);
}

static void sigvcf_dsp(t_sigvcf *x, t_signal **sp)
{
    x->x_ctl->c_isr = 6.28318f/sp[0]->s_sr;
    dsp_add(sigvcf_perform, 6,
        sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec,
            x->x_ctl, (t_int)sp[0]->s_n);
}

static
void sigvcf_setup(void)
{
    sigvcf_class = class_new(gensym("vcf~"), (t_newmethod)sigvcf_new, 0,
        sizeof(t_sigvcf), 0, A_DEFFLOAT, 0);
    CLASS_MAINSIGNALIN(sigvcf_class, t_sigvcf, x_f);
    class_addmethod(sigvcf_class, (t_method)sigvcf_dsp,
        gensym("dsp"), A_CANT, 0);
    class_addmethod(sigvcf_class, (t_method)sigvcf_ft1,
        gensym("ft1"), A_FLOAT, 0);
}

/* -------------------------- noise~ ------------------------------ */
static t_class *noise_class;

typedef struct _noise
{
    t_object x_obj;
    int x_val;
} t_noise;

static void *noise_new(void)
{
    t_noise *x = (t_noise *)pd_new(noise_class);
        /* seed each instance differently.  Once in a blue moon two threads
        could grab the same seed value.  We can live with that. */
    static int init = 307;
    x->x_val = (init *= 1319);
    outlet_new(&x->x_obj, gensym("signal"));
    return (x);
}

static t_int *noise_perform(t_int *w)
{
    t_sample *out = (t_sample *)(w[1]);
    int *vp = (int *)(w[2]);
    int n = (int)(w[3]);
    int val = *vp;
    while (n--)
    {
        *out++ = ((t_sample)((val & 0x7fffffff) - 0x40000000)) *
            (t_sample)(1.0 / 0x40000000);
        val = val * 435898247 + 382842987;
    }
    *vp = val;
    return (w+4);
}

static void noise_dsp(t_noise *x, t_signal **sp)
{
    dsp_add(noise_perform, 3, sp[0]->s_vec, &x->x_val, (t_int)sp[0]->s_n);
}

static void noise_float(t_noise *x, t_float f)
{
    /* set the seed */
    x->x_val = (int)f;
}

static void noise_setup(void)
{
    noise_class = class_new(gensym("noise~"), (t_newmethod)noise_new, 0,
        sizeof(t_noise), 0, A_DEFFLOAT, 0);
    class_addmethod(noise_class, (t_method)noise_dsp,
        gensym("dsp"), A_CANT, 0);
    class_addmethod(noise_class, (t_method)noise_float,
        gensym("seed"), A_FLOAT, 0);
}

/* ----------------------- global setup routine ---------------- */
void d_osc_setup(void)
{
    phasor_setup();
    cos_setup();
    osc_setup();
    sigvcf_setup();
    noise_setup();
}