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Diffstat (limited to 'wavefolder~.c')
| -rw-r--r-- | wavefolder~.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/wavefolder~.c b/wavefolder~.c new file mode 100644 index 0000000..158d137 --- /dev/null +++ b/wavefolder~.c @@ -0,0 +1,123 @@ +/* + * wavefolder~ - modulation of triangle->sawtooth wave and PWM generation from modulated + * tri-saw wave. + * Copyright (c) 2012, Dr Edward Kelly <morph_2016@yahoo.co.uk> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, this list + * of conditions and the following disclaimer in the documentation and/or other materials + * + * provided with the distribution. + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT + * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "m_pd.h" +#include <math.h> +#define _limit 0.99999 + + +static t_class *wavefolder_tilde_class; + +typedef struct _wavefolder_tilde { + t_object x_obj; + t_float token, bipolar; +// t_float token, debug, safety; + t_outlet *folded, *pulse; +} t_wavefolder_tilde; + +static inline float saturate( float input ) { //clamp without branching + float x1 = fabsf( input + _limit ); + float x2 = fabsf( input - _limit ); + return 0.5 * (x1 - x2); +} + +t_int *wavefolder_tilde_perform(t_int *w) { + t_wavefolder_tilde *x = (t_wavefolder_tilde *)(w[1]); + t_sample *in = (t_sample *)(w[2]); + t_sample *thresh = (t_sample *)(w[3]); + t_sample *pthresh = (t_sample *)(w[4]); + t_sample *out = (t_sample *)(w[5]); + t_sample *pout = (t_sample *)(w[6]); + int n = (int)(w[7]); + t_float insample = 0; + t_float outsample = 0; + t_float thsample = 0; + t_float pthsample = 0; + t_float reciprocal = 0; + t_float remainder = 0; + t_float remciprocal = 0; + + while (n--) + { + insample = *in++; + thsample = saturate(*thresh++); + thsample = thsample * 0.5 + 0.5; + pthsample = *pthresh++; + reciprocal = 1 / thsample; + remainder = 1 - thsample; + remciprocal = 1 / remainder; + if(x->bipolar != 0) { + outsample = *out++ = (insample < thsample ? insample * reciprocal : 1 - ((insample - thsample) * remciprocal)) * 2 - 1; + } + else if(x->bipolar == 0) { + outsample = *out++ = insample < thsample ? insample * reciprocal : 1 - ((insample - thsample) * remciprocal); + } + if(x->bipolar == 0) { + pthsample = pthsample * 0.5 + 0.5; + *pout++ = outsample > pthsample ? 1 : 0; + } + else if(x->bipolar != 0) { + *pout++ = outsample > pthsample ? 1 : -1; + } + } + return (w+8); +} + +void wavefolder_tilde_bipolar(t_wavefolder_tilde *x, t_floatarg f) { + x->bipolar = f; +} + +void wavefolder_tilde_dsp(t_wavefolder_tilde *x, t_signal **sp) { + dsp_add(wavefolder_tilde_perform, 7, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec, sp[4]->s_vec, sp[0]->s_n); +} + +void *wavefolder_tilde_new(t_floatarg f) { + t_wavefolder_tilde *x = (t_wavefolder_tilde *)pd_new(wavefolder_tilde_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, &s_signal, &s_signal); +// floatinlet_new (&x->x_obj, &x->threshold); + outlet_new(&x->x_obj, &s_signal); + outlet_new(&x->x_obj, &s_signal); + return (void *)x; +} + +void wavefolder_tilde_setup(void) { + wavefolder_tilde_class = class_new(gensym("wavefolder~"), + (t_newmethod)wavefolder_tilde_new, + 0, sizeof(t_wavefolder_tilde), + CLASS_DEFAULT, A_DEFFLOAT, 0); + + post("~~~~~~~~~~~~~~~>wavefolder~"); + post("~~~>by Ed Kelly, 2012"); + + class_addmethod(wavefolder_tilde_class, + (t_method)wavefolder_tilde_dsp, gensym("dsp"), 0); + CLASS_MAINSIGNALIN(wavefolder_tilde_class, t_wavefolder_tilde, token); + class_addmethod(wavefolder_tilde_class, (t_method)wavefolder_tilde_bipolar, gensym("bipolar"), A_DEFFLOAT, 0); + // class_addmethod(wavefolder_tilde_class, (t_method)wavefolder_tilde_mode, gensym("mode"), A_DEFFLOAT, 0); +} |