shithub: soundpipe

ref: 233c9646efb377aac5b0d87df6f8a16be94fa3fe
dir: /tangled/rline.c/

#line 35 "rline.org"
#include <math.h>
#define SK_RLINE_PRIV
#include "rline.h"
#line 114 "rline.org"
#define SK_RLINE_PHSLEN 0x1000000L
#define SK_RLINE_PHSMSK 0xFFFFFFL
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#define LCG(y) (y * 0x343fd + 0x269ec3)
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#define RNG(y) ((y >> 1) & 0x7fffffff)
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#line 231 "rline.org"
void sk_rline_init(sk_rline *rl, int sr, int seed)
{
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rl->rng = seed;
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rl->rngscale = 1.0 / ((1L<<31) - 1);
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rl->rng = LCG(rl->rng);
rl->start = RNG(rl->rng) * rl->rngscale;
rl->rng = LCG(rl->rng);
rl->end = RNG(rl->rng) * rl->rngscale;
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rl->scale = (rl->end - rl->start) / SK_RLINE_PHSLEN;
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#line 103 "rline.org"
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rl->maxlens = (SKFLT)SK_RLINE_PHSLEN / sr;
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rl->phasepos = 0;
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sk_rline_min(rl, 0);
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sk_rline_max(rl, 1);
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sk_rline_rate(rl, 1);
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}
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void sk_rline_min(sk_rline *rl, SKFLT min)
{
    rl->min = min;
}
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void sk_rline_max(sk_rline *rl, SKFLT max)
{
    rl->max= max;
}
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void sk_rline_rate(sk_rline *rl, SKFLT rate)
{
    rl->rate= rate;
}
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SKFLT sk_rline_tick(sk_rline *rl)
{
    SKFLT out;

    out = 0;

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out = rl->start + rl->phasepos*rl->scale;
out = out * (rl->max - rl->min) + rl->min;
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rl->phasepos += floor(rl->rate * rl->maxlens);
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if (rl->phasepos >= SK_RLINE_PHSLEN) {
    rl->phasepos &= SK_RLINE_PHSMSK;
    rl->start = rl->end;
    rl->rng = LCG(rl->rng);
    rl->end = RNG(rl->rng) * rl->rngscale;
    rl->scale = (rl->end - rl->start) / SK_RLINE_PHSLEN;
}
#line 337 "rline.org"

    return out;
}
#line 35 "rline.org"