Max 5 API Reference

jit.transfer.linear.c

/*
 *  jit.transfer.linear.c
 *
 *  Copyright 2001-2005 - Cycling '74
 *  Derek Gerstmann - derek@cycling74.com
 *
 *  functor for a linear transfer function (aka linear interpolation)
 *
 */

 // --------------------------------------------------------------------------

#include "jit.common.h"
#include "jit.functor.h"

// --------------------------------------------------------------------------

typedef struct _jit_functor_transfer_linear
{
    t_jit_object    ob;
    double          low;
    double          high;
} t_jit_functor_transfer_linear;

// --------------------------------------------------------------------------

t_jit_object *jit_functor_transfer_linear_new(void);
t_jit_err jit_functor_transfer_linear_free(t_jit_functor_transfer_linear *x);
t_jit_err jit_functor_transfer_linear_low(t_jit_functor_transfer_linear *x, void *attr, long argc, t_atom *argv);
t_jit_err jit_functor_transfer_linear_high(t_jit_functor_transfer_linear *x, void *attr, long argc, t_atom *argv);
t_jit_err jit_functor_transfer_linear_recalc(t_jit_functor_transfer_linear *x);

long jit_functor_transfer_linear_eval_fixed(t_jit_functor_transfer_linear *x, long dimcount, long *vals);
float jit_functor_transfer_linear_eval_float32(t_jit_functor_transfer_linear *x, long dimcount, float *vals);
double jit_functor_transfer_linear_eval_float64(t_jit_functor_transfer_linear *x, long dimcount, double *vals);

long jit_functor_transfer_linear_eval_fixed_scalar(t_jit_functor_transfer_linear *x, long val);
float jit_functor_transfer_linear_eval_float32_scalar(t_jit_functor_transfer_linear *x, float val);
double jit_functor_transfer_linear_eval_float64_scalar(t_jit_functor_transfer_linear *x, double val);

t_class * _jit_functor_transfer_linear_class;

// --------------------------------------------------------------------------

t_jit_err jit_functor_transfer_linear_init(void)
{
    t_jit_object *attr;

    // create functor class
    _jit_functor_transfer_linear_class = jit_class_new("jit_functor_transfer_linear",
        (method)jit_functor_transfer_linear_new,(method)jit_functor_transfer_linear_free,
        sizeof(t_jit_functor_transfer_linear),0L);

    // add attribute methods
    attr = jit_object_new(_jit_sym_jit_attr_offset,"low",_jit_sym_float64,0,
        (method)0L,(method)jit_functor_transfer_linear_low,calcoffset(t_jit_functor_transfer_linear,low));
    jit_class_addattr(_jit_functor_transfer_linear_class,attr);
    attr = jit_object_new(_jit_sym_jit_attr_offset,"high",_jit_sym_float64,0,
        (method)0L,(method)jit_functor_transfer_linear_high,calcoffset(t_jit_functor_transfer_linear,high));
    jit_class_addattr(_jit_functor_transfer_linear_class,attr);

    // add evaluation methods
    jit_class_addmethod(_jit_functor_transfer_linear_class, 
        (method)jit_functor_transfer_linear_eval_fixed, "evalfixed", A_CANT, 0L);
    jit_class_addmethod(_jit_functor_transfer_linear_class, 
        (method)jit_functor_transfer_linear_eval_float32, "evalfloat32", A_CANT, 0L);
    jit_class_addmethod(_jit_functor_transfer_linear_class, 
        (method)jit_functor_transfer_linear_eval_float64, "evalfloat64", A_CANT, 0L);

    // add to functor registry
    jit_functor_setup_class(_jit_functor_transfer_linear_class,"transfer","linear");
    jit_class_register(_jit_functor_transfer_linear_class);
    return JIT_ERR_NONE;
}

t_jit_object *jit_functor_transfer_linear_new(void)
{
    t_jit_functor_transfer_linear *x;

    if (x = (t_jit_functor_transfer_linear *)jit_object_alloc(_jit_functor_transfer_linear_class)) {

        // initialization
        x->low = 0.0;
        x->high = 1.0;
        jit_functor_transfer_linear_recalc(x);
    }

    return (t_jit_object *)x;
}

t_jit_err jit_functor_transfer_linear_free(t_jit_functor_transfer_linear *x)
{
    return JIT_ERR_NONE;
}

// --------------------------------------------------------------------------

t_jit_err jit_functor_transfer_linear_low(
    t_jit_functor_transfer_linear *x, void *attr, long argc, t_atom *argv)
{
    double v;

    if (x) {
        v=jit_atom_getfloat(argv);
        if (x->low != v) {
            x->low = v;
            jit_functor_transfer_linear_recalc(x);
        }
        return JIT_ERR_NONE;
    }
    return JIT_ERR_INVALID_PTR;
}

t_jit_err jit_functor_transfer_linear_high(
    t_jit_functor_transfer_linear *x, void *attr, long argc, t_atom *argv)
{
    double v;

    if (x) {
        v=jit_atom_getfloat(argv);
        if (x->high != v) {
            x->high = v;
            jit_functor_transfer_linear_recalc(x);
        }
        return JIT_ERR_NONE;
    }
    return JIT_ERR_INVALID_PTR;
}

t_jit_err jit_functor_transfer_linear_recalc(t_jit_functor_transfer_linear *x)
{
    // calculate intermediary values for efficiency
    double t;
    if(x->low > x->high)
    {
        t = x->low;
        x->low = x->high;
        x->high = t;
    }
    return JIT_ERR_NONE;
}

// -----------------------------------------------------------------------------
// vector evaluation functions
// -----------------------------------------------------------------------------

long jit_functor_transfer_linear_eval_fixed(
    t_jit_functor_transfer_linear *x, long dimcount, long *vals)
{
    return jit_functor_eval_fixed_with_float64((t_jit_object *)x,dimcount,vals,
            (t_jit_functor_float64_sig)jit_functor_transfer_linear_eval_float64);
}

float jit_functor_transfer_linear_eval_float32(
    t_jit_functor_transfer_linear *x, long dimcount, float *vals)
{
    return jit_functor_eval_float32_with_scalar_product((t_jit_object *)x,dimcount,vals,
            (t_jit_functor_float32_scalar_sig)jit_functor_transfer_linear_eval_float32_scalar);
}

double jit_functor_transfer_linear_eval_float64(
    t_jit_functor_transfer_linear *x, long dimcount, double *vals)
{
    return jit_functor_eval_float64_with_scalar_product((t_jit_object *)x,dimcount,vals,
            (t_jit_functor_float64_scalar_sig)jit_functor_transfer_linear_eval_float64_scalar);
}

// -----------------------------------------------------------------------------
// scalar evaluation functions
// -----------------------------------------------------------------------------

long jit_functor_transfer_linear_eval_fixed_scalar(
    t_jit_functor_transfer_linear *x, long val)
{
    return FloatToFixed(jit_functor_transfer_linear_eval_float32_scalar(x,FixedToFloat(val)));
}

float jit_functor_transfer_linear_eval_float32_scalar(
    t_jit_functor_transfer_linear *x, float val)
{
    return x->low + val * (x->high - x->low);
}

double jit_functor_transfer_linear_eval_float64_scalar(
    t_jit_functor_transfer_linear *x, double val)
{
    return x->low + val * (x->high - x->low);
}

// -----------------------------------------------------------------------------

Copyright © 2008, Cycling '74