66cc643402
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26551 a1c6a512-1295-4272-9138-f99709370657
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
#include "../src/m_pd.h"
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#include "../src/m_fixed.h"
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static t_class *noise_class;
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typedef struct _noise
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{
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t_object x_obj;
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int x_val;
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} t_noise;
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static void *noise_new(void)
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{
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t_noise *x = (t_noise *)pd_new(noise_class);
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static int init = 307;
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x->x_val = (init *= 1319);
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outlet_new(&x->x_obj, gensym("signal"));
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return (x);
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}
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static t_int *noise_perform(t_int *w)
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{
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t_sample *out = (t_sample *)(w[1]);
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int *vp = (int *)(w[2]);
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int n = (int)(w[3]);
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int val = *vp;
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while (n--)
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{
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#ifndef FIXEDPOINT
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*out++ = ((t_sample)((val & 0x7fffffff) - 0x40000000)) *
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(t_sample)(1.0 / 0x40000000);
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#else
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*out++=val>>(32-fix1);
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#endif
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val = val * 435898247 + 382842987;
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}
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*vp = val;
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return (w+4);
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}
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static void noise_dsp(t_noise *x, t_signal **sp)
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{
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dsp_add(noise_perform, 3, sp[0]->s_vec, &x->x_val, sp[0]->s_n);
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}
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void noise_tilde_setup(void)
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{
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noise_class = class_new(gensym("noise~"), (t_newmethod)noise_new, 0,
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sizeof(t_noise), 0, 0);
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class_addmethod(noise_class, (t_method)noise_dsp, gensym("dsp"), 0);
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}
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