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/*
sterrain.c:
Copyright (C) 2002 Matt Gilliard, John ffitch
for the original file wave-terrain.c from the csound distribution
Modifications and enhancements (C) 2020 Christian Bacher
This file is part of Csound.
The Csound Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "csoundCore.h"
#include "interlocks.h"
#include <math.h>
/* Wave-terrain synthesis opcode
*
* author: m gilliard
* en6mjg@bath.ac.uk
*
* Christian Bacher docb22@googlemail.com
* Changes to the original:
* - uses the superformula for generating the curves
*
* - tables are krate
* - added k parameter for rotating the curve arround the current x,y
*/
typedef struct {
OPDS h;
MYFLT *aout;
MYFLT *kamp;
MYFLT *kpch;
MYFLT *kx;
MYFLT *ky;
MYFLT *krx;
MYFLT *kry;
MYFLT *krot; // rotation of the curve
MYFLT *ktabx, *ktaby; /* Table numbers */
MYFLT *sy;
MYFLT *sz;
MYFLT *sn1;
MYFLT *sn2;
MYFLT *sn3;
MYFLT *sa;
MYFLT *sb;
MYFLT *speriod;
/* Internals */
MYFLT oldfnx; // storage of the current table for k-rate table change
MYFLT oldfny; // storage of the current table for k-rate table change
MYFLT *xarr, *yarr; /* Actual tables */
MYFLT sizx, sizy;
double theta;
} SUPERTER;
static void rotate_point(MYFLT cx, MYFLT cy, MYFLT angle, MYFLT *x, MYFLT *y)
{
if(angle == 0) return;
MYFLT s = SIN(angle);
MYFLT c = COS(angle);
*x -= cx;
*y -= cy;
float xnew = *x * c - *y * s;
float ynew = *x * s + *y * c;
*x = xnew + cx;
*y = ynew + cy;
}
typedef struct superparams {
double y;
double z;
double n1;
double n2;
double n3;
double a;
double b;
} SUPERPARAMS;
static void superformula(MYFLT t, MYFLT kx, MYFLT ky, MYFLT krx, MYFLT kry,
SUPERPARAMS *sp, MYFLT *outX, MYFLT *outY) {
if(sp->n1 == 0) return;
if(sp->a == 0) return;
if(sp->b == 0) return;
MYFLT y = sp->y;
MYFLT z = sp->z;
MYFLT n1 = sp->n1;
MYFLT n2 = sp->n2;
MYFLT n3 = sp->n3;
MYFLT a = sp->a;
MYFLT b = sp->b;
MYFLT t1 = COS(y*t/4);
MYFLT t2 = SIN(z*t/4);
MYFLT r0 = POWER(FABS(t1/a),n2) + POWER(FABS(t2/b),n3);
MYFLT r = POWER(r0, -1/n1);
*outX = kx + krx*COS(r);
*outY = ky + kry*SIN(r);
}
static int32_t wtinit(CSOUND *csound, SUPERTER *p)
{
p->xarr = NULL;
p->yarr = NULL;
p->oldfnx = -1;
p->oldfny = -1;
p->sizx = 0;
p->sizy = 0;
p->theta = 0.0;
return OK;
}
static int32_t wtPerf(CSOUND *csound, SUPERTER *p)
{
uint32_t offset = p->h.insdshead->ksmps_offset;
uint32_t early = p->h.insdshead->ksmps_no_end;
uint32_t i, nsmps = CS_KSMPS;
int32_t xloc, yloc;
MYFLT xc = FL(0.0), yc = FL(0.0);
MYFLT amp = *p->kamp;
MYFLT pch = *p->kpch;
if (*(p->ktabx) != p->oldfnx || p->xarr == NULL) {
p->oldfnx = *(p->ktabx);
FUNC *ftp = csound->FTFindP(csound, p->ktabx); /* new table parameters */
if (UNLIKELY((ftp == NULL) || ((p->xarr = ftp->ftable) == NULL)))
return csound->PerfError(csound, &(p->h), Str("no table %g\n"), *p->ktabx);
p->sizx = (MYFLT)ftp->flen;
}
if (*(p->ktaby) != p->oldfny || p->yarr == NULL) {
p->oldfny = *(p->ktaby);
FUNC *ftp = csound->FTFindP(csound, p->ktaby); /* new table parameters */
if (UNLIKELY((ftp == NULL) || ((p->yarr = ftp->ftable) == NULL)))
return csound->PerfError(csound, &(p->h), Str("no table %g\n"), *p->ktaby);
p->sizy = (MYFLT)ftp->flen;
}
SUPERPARAMS s;
s.y = FLOOR(*p->sy);
s.z = FLOOR(*p->sz);
s.n1 = *p->sn1;
s.n2 = *p->sn2;
s.n3 = *p->sn3;
s.a = *p->sa;
s.b = *p->sb;
MYFLT period = 1;
if(*p->speriod != 0) period = 1/(*p->speriod);
MYFLT sizx = p->sizx, sizy = p->sizy;
MYFLT theta = p->theta;
MYFLT *aout = p->aout;
if (UNLIKELY(offset)) memset(aout, '\0', offset*sizeof(MYFLT));
if (UNLIKELY(early)) {
nsmps -= early;
memset(&aout[nsmps], '\0', early*sizeof(MYFLT));
}
for (i=offset; i<nsmps; i++) {
/* COMPUTE LOCATION OF SCANNING POINT */
superformula(theta,*p->kx,*p->ky,*p->krx,*p->kry,&s,&xc,&yc);
rotate_point(*p->kx,*p->ky,*p->krot,&xc,&yc);
/* MAP SCANNING POINT TO BE IN UNIT SQUARE */
xc = xc-FLOOR(xc);
yc = yc-FLOOR(yc);
/* SCALE TO TABLE-SIZE SQUARE */
xloc = (int32_t)(xc * sizx);
yloc = (int32_t)(yc * sizy);
/* OUTPUT AM OF TABLE VALUES * KAMP */
aout[i] = p->xarr[xloc] * p->yarr[yloc] * amp;
/* MOVE SCANNING POINT ROUND THE ELLIPSE */
theta += pch*((period*TWOPI_F) / csound->GetSr(csound));
}
p->theta = theta;
return OK;
}
#define S(x) sizeof(x)
static OENTRY sterrain_localops[] = {
{ "sterrain", S(SUPERTER), TR, 3, "a", "kkkkkkkkkkkkkkkkk",
(SUBR)wtinit, (SUBR)wtPerf },
};
LINKAGE_BUILTIN(sterrain_localops)
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