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rv3.c
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Fri, Jun 21, 00:53

rv3.c
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#ifndef lint
static const char RCSid[] = "$Id: rv3.c,v 2.43 2020/01/23 19:20:54 greg Exp $";
#endif
/*
* rv3.c - miscellaneous routines for rview.
*
* External symbols declared in rpaint.h
*/
#include "copyright.h"
#include <string.h>
#include "ray.h"
#include "rpaint.h"
#include "otypes.h"
#include "otspecial.h"
#include "random.h"
#ifndef WFLUSH
#define WFLUSH 64 /* flush after this many primary rays */
#endif
#ifndef WFLUSH1
#define WFLUSH1 512 /* or this many total rays */
#endif
#ifdef SMLFLT
#define sscanvec(s,v) (sscanf(s,"%f %f %f",v,v+1,v+2)==3)
#else
#define sscanvec(s,v) (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
#endif
extern int ray_pnprocs;
static RNUMBER niflush; /* flushes since newimage() */
int
getrect( /* get a box */
char *s,
RECT *r
)
{
int x0, y0, x1, y1;
if (*s && !strncmp(s, "all", strlen(s))) {
r->l = r->d = 0;
r->r = hresolu;
r->u = vresolu;
return(0);
}
if (sscanf(s, "%d %d %d %d", &x0, &y0, &x1, &y1) != 4) {
if (dev->getcur == NULL)
return(-1);
(*dev->comout)("Pick first corner\n");
if ((*dev->getcur)(&x0, &y0) == ABORT)
return(-1);
(*dev->comout)("Pick second corner\n");
if ((*dev->getcur)(&x1, &y1) == ABORT)
return(-1);
}
if (x0 < x1) {
r->l = x0;
r->r = x1;
} else {
r->l = x1;
r->r = x0;
}
if (y0 < y1) {
r->d = y0;
r->u = y1;
} else {
r->d = y1;
r->u = y0;
}
if (r->l < 0) r->l = 0;
if (r->d < 0) r->d = 0;
if (r->r > hresolu) r->r = hresolu;
if (r->u > vresolu) r->u = vresolu;
if (r->l > r->r) r->l = r->r;
if (r->d > r->u) r->d = r->u;
return(0);
}
int
getinterest( /* get area of interest */
char *s,
int direc,
FVECT vec,
double *mp
)
{
if (sscanf(s, "%lf", mp) != 1)
*mp = 1.0;
else if (*mp < -FTINY) /* negative zoom is reduction */
*mp = -1.0 / *mp;
else if (*mp <= FTINY) { /* too small */
error(COMMAND, "illegal magnification");
return(-1);
}
if (!sscanvec(sskip(s), vec)) {
RAY thisray;
int x, y;
if (dev->getcur == NULL)
return(-1);
(*dev->comout)("Pick view center\n");
if ((*dev->getcur)(&x, &y) == ABORT)
return(-1);
if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
error(COMMAND, "not on image");
return(-1);
}
if (!direc || ourview.type == VT_PAR) {
int weakhit = 0;
FVECT weakpt;
rayorigin(&thisray, PRIMARY, NULL, NULL);
while (localhit(&thisray, &thescene)) {
OBJREC *m = NULL;
if (thisray.clipset == NULL ||
!inset(thisray.clipset,
thisray.ro->omod))
m = findmaterial(thisray.ro);
if ((m != NULL) & !weakhit &&
istransp(m->otype) &&
m->otype != MAT_MIST) {
weakhit = 1;
VCOPY(weakpt, thisray.rop);
} else if (m != NULL && !istransp(m->otype) &&
!isBSDFproxy(m))
break; /* something solid */
VCOPY(thisray.rorg, thisray.rop);
rayclear(&thisray); /* skip invisible */
}
if ((thisray.ro == NULL) | (thisray.ro == &Aftplane)) {
if (!weakhit) {
error(COMMAND, "not a local object");
return(-1);
} /* else use weak obj. */
VCOPY(thisray.rop, weakpt);
}
}
if (direc)
if (ourview.type == VT_PAR)
VSUB(vec, thisray.rop, ourview.vp);
else
VCOPY(vec, thisray.rdir);
else
VCOPY(vec, thisray.rop);
} else if (direc) {
VSUB(vec, vec, ourview.vp);
if (normalize(vec) == 0.0) {
error(COMMAND, "point at view origin");
return(-1);
}
}
return(0);
}
COLORV *
greyof( /* convert color to greyscale */
COLOR col
)
{
static COLOR gcol;
double b;
b = bright(col);
setcolor(gcol, b, b, b);
return(gcol);
}
static void
recolor( /* recolor the given node */
PNODE *p
)
{
while (p->kid != NULL) { /* need to propogate down */
int mx = (p->xmin + p->xmax) >> 1;
int my = (p->ymin + p->ymax) >> 1;
int ki;
if (p->x >= mx)
ki = (p->y >= my) ? UR : DR;
else
ki = (p->y >= my) ? UL : DL;
pcopy(p, p->kid+ki);
p = p->kid + ki;
}
(*dev->paintr)(greyscale?greyof(p->v):p->v,
p->xmin, p->ymin, p->xmax, p->ymax);
}
int
paint( /* compute and paint a rectangle */
PNODE *p
)
{
static RAY thisray;
double h, v;
if ((p->xmax <= p->xmin) | (p->ymax <= p->ymin)) { /* empty */
p->x = p->xmin;
p->y = p->ymin;
setcolor(p->v, 0.0, 0.0, 0.0);
return(0);
}
/* jitter ray direction */
p->x = h = p->xmin + (p->xmax-p->xmin)*frandom();
p->y = v = p->ymin + (p->ymax-p->ymin)*frandom();
if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
h/hresolu, v/vresolu)) < -FTINY) {
setcolor(thisray.rcol, 0.0, 0.0, 0.0);
} else if (!ray_pnprocs) { /* immediate mode */
ray_trace(&thisray);
} else { /* queuing mode */
int rval;
rayorigin(&thisray, PRIMARY, NULL, NULL);
thisray.rno = (RNUMBER)p;
rval = ray_pqueue(&thisray);
if (!rval)
return(0);
if (rval < 0)
return(-1);
/* get node for returned ray */
p = (PNODE *)thisray.rno;
}
copycolor(p->v, thisray.rcol);
scalecolor(p->v, exposure);
recolor(p); /* paint it */
if (dev->flush != NULL) { /* shall we check for input? */
static RNUMBER lastflush = 0;
RNUMBER counter = raynum;
int flushintvl;
if (!ray_pnprocs) {
counter = nrays;
flushintvl = WFLUSH1;
} else if (ambounce == 0)
flushintvl = ray_pnprocs*WFLUSH;
else if (niflush < WFLUSH)
flushintvl = ray_pnprocs*niflush/(ambounce*(ambounce>0)+1);
else
flushintvl = ray_pnprocs*WFLUSH/(ambounce*(ambounce>0)+1);
if (lastflush > counter)
lastflush = 0; /* counter wrapped */
if (counter - lastflush >= flushintvl) {
lastflush = counter;
(*dev->flush)();
niflush++;
}
}
return(1);
}
int
waitrays(void) /* finish up pending rays */
{
int nwaited = 0;
int rval;
RAY raydone;
if (!ray_pnprocs) /* immediate mode? */
return(0);
while ((rval = ray_presult(&raydone, 0)) > 0) {
PNODE *p = (PNODE *)raydone.rno;
copycolor(p->v, raydone.rcol);
scalecolor(p->v, exposure);
recolor(p);
nwaited++;
}
if (rval < 0)
return(-1);
return(nwaited);
}
void
newimage( /* start a new image */
char *s
)
{
int newnp = 0;
/* # rendering procs arg? */
if (s != NULL)
sscanf(s, "%d", &newnp);
/* free old image */
freepkids(&ptrunk);
/* compute resolution */
hresolu = dev->xsiz;
vresolu = dev->ysiz;
normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
ptrunk.xmin = ptrunk.ymin = pframe.l = pframe.d = 0;
ptrunk.xmax = pframe.r = hresolu;
ptrunk.ymax = pframe.u = vresolu;
pdepth = 0;
/* clear device */
(*dev->clear)(hresolu, vresolu);
if (newparam) { /* (re)start rendering procs */
if (ray_pnprocs)
ray_pclose(0); /* should already be closed */
if (newnp > 0)
nproc = newnp;
if (nproc > 1)
ray_popen(nproc);
newparam = 0;
} else if ((newnp > 0) & (newnp != nproc)) {
if (newnp == 1) /* change # rendering procs */
ray_pclose(0);
else if (newnp < ray_pnprocs)
ray_pclose(ray_pnprocs - newnp);
else
ray_popen(newnp - ray_pnprocs);
nproc = newnp;
}
niflush = 0; /* get first value */
paint(&ptrunk);
}
void
redraw(void) /* redraw the image */
{
(*dev->clear)(hresolu, vresolu);
(*dev->comout)("redrawing...\n");
repaint(0, 0, hresolu, vresolu);
(*dev->comout)("\n");
}
void
repaint( /* repaint a region */
int xmin,
int ymin,
int xmax,
int ymax
)
{
RECT reg;
reg.l = xmin; reg.r = xmax;
reg.d = ymin; reg.u = ymax;
paintrect(&ptrunk, &reg);
}
void
paintrect( /* paint picture rectangle */
PNODE *p,
RECT *r
)
{
int mx, my;
if (p->xmax - p->xmin <= 0 || p->ymax - p->ymin <= 0)
return;
if (p->kid == NULL) {
(*dev->paintr)(greyscale?greyof(p->v):p->v,
p->xmin, p->ymin, p->xmax, p->ymax); /* do this */
return;
}
mx = (p->xmin + p->xmax) >> 1; /* do kids */
my = (p->ymin + p->ymax) >> 1;
if (mx > r->l) {
if (my > r->d)
paintrect(p->kid+DL, r);
if (my < r->u)
paintrect(p->kid+UL, r);
}
if (mx < r->r) {
if (my > r->d)
paintrect(p->kid+DR, r);
if (my < r->u)
paintrect(p->kid+UR, r);
}
}
PNODE *
findrect( /* find a rectangle */
int x,
int y,
PNODE *p,
int pd
)
{
int mx, my;
while (p->kid != NULL && pd--) {
mx = (p->xmin + p->xmax) >> 1;
my = (p->ymin + p->ymax) >> 1;
if (x < mx) {
if (y < my) {
p = p->kid+DL;
} else {
p = p->kid+UL;
}
} else {
if (y < my) {
p = p->kid+DR;
} else {
p = p->kid+UR;
}
}
}
return(p);
}
void
compavg( /* recompute averages */
PNODE *p
)
{
int i, navg;
if (p->kid == NULL)
return;
setcolor(p->v, .0, .0, .0);
navg = 0;
for (i = 0; i < 4; i++) {
if (p->kid[i].xmin >= p->kid[i].xmax) continue;
if (p->kid[i].ymin >= p->kid[i].ymax) continue;
compavg(p->kid+i);
addcolor(p->v, p->kid[i].v);
navg++;
}
if (navg > 1)
scalecolor(p->v, 1./navg);
}
void
scalepict( /* scale picture values */
PNODE *p,
double sf
)
{
scalecolor(p->v, sf); /* do this node */
if (p->kid == NULL)
return;
/* do children */
scalepict(p->kid+DL, sf);
scalepict(p->kid+DR, sf);
scalepict(p->kid+UL, sf);
scalepict(p->kid+UR, sf);
}
void
getpictcolrs( /* get scanline from picture */
int yoff,
COLR *scan,
PNODE *p,
int xsiz,
int ysiz
)
{
int mx;
int my;
if (p->kid == NULL) { /* do this node */
setcolr(scan[0], colval(p->v,RED),
colval(p->v,GRN),
colval(p->v,BLU));
for (mx = 1; mx < xsiz; mx++)
copycolr(scan[mx], scan[0]);
return;
}
/* do kids */
mx = xsiz >> 1;
my = ysiz >> 1;
if (yoff < my) {
getpictcolrs(yoff, scan, p->kid+DL, mx, my);
getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
} else {
getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
}
}
void
freepkids( /* free pnode's children */
PNODE *p
)
{
if (p->kid == NULL)
return;
freepkids(p->kid+DL);
freepkids(p->kid+DR);
freepkids(p->kid+UL);
freepkids(p->kid+UR);
free((void *)p->kid);
p->kid = NULL;
}
void
newview( /* change viewing parameters */
VIEW *vp
)
{
char *err;
if ((err = setview(vp)) != NULL) {
sprintf(errmsg, "view not set - %s", err);
error(COMMAND, errmsg);
} else if (memcmp((char *)vp, (char *)&ourview, sizeof(VIEW))) {
oldview = ourview;
ourview = *vp;
newimage(NULL);
}
}
void
moveview( /* move viewpoint */
double angle,
double elev,
double mag,
FVECT vc
)
{
double d;
VIEW nv = ourview;
int i;
spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
if (elev != 0.0)
geodesic(nv.vdir, nv.vdir, nv.vup, elev*(-PI/180.), GEOD_RAD);
if (nv.type == VT_PAR) {
nv.horiz /= mag;
nv.vert /= mag;
d = 0.0; /* don't move closer */
for (i = 0; i < 3; i++)
d += (vc[i] - ourview.vp[i])*ourview.vdir[i];
} else {
d = sqrt(dist2(ourview.vp, vc)) / mag;
if (nv.vfore > FTINY) {
nv.vfore += d - d*mag;
if (nv.vfore < 0.0) nv.vfore = 0.0;
}
if (nv.vaft > FTINY) {
nv.vaft += d - d*mag;
if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
}
nv.vdist /= mag;
}
for (i = 0; i < 3; i++)
nv.vp[i] = vc[i] - d*nv.vdir[i];
newview(&nv);
}
void
pcopy( /* copy paint node p1 into p2 */
PNODE *p1,
PNODE *p2
)
{
copycolor(p2->v, p1->v);
p2->x = p1->x;
p2->y = p1->y;
}
void
zoomview( /* zoom in or out */
VIEW *vp,
double zf
)
{
switch (vp->type) {
case VT_PAR: /* parallel view */
vp->horiz /= zf;
vp->vert /= zf;
return;
case VT_ANG: /* angular fisheye */
vp->horiz /= zf;
if (vp->horiz > 360.)
vp->horiz = 360.;
vp->vert /= zf;
if (vp->vert > 360.)
vp->vert = 360.;
return;
case VT_PLS: /* planisphere fisheye */
vp->horiz = sin((PI/180./2.)*vp->horiz) /
(1.0 + cos((PI/180./2.)*vp->horiz)) / zf;
vp->horiz *= vp->horiz;
vp->horiz = (2.*180./PI)*acos((1. - vp->horiz) /
(1. + vp->horiz));
vp->vert = sin((PI/180./2.)*vp->vert) /
(1.0 + cos((PI/180./2.)*vp->vert)) / zf;
vp->vert *= vp->vert;
vp->vert = (2.*180./PI)*acos((1. - vp->vert) /
(1. + vp->vert));
return;
case VT_CYL: /* cylindrical panorama */
vp->horiz /= zf;
if (vp->horiz > 360.)
vp->horiz = 360.;
vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.);
return;
case VT_PER: /* perspective view */
vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
(PI/180./2.);
vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
(PI/180./2.);
return;
case VT_HEM: /* hemispherical fisheye */
vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
if (vp->horiz >= 1.0-FTINY)
vp->horiz = 180.;
else
vp->horiz = asin(vp->horiz) / (PI/180./2.);
vp->vert = sin(vp->vert*(PI/180./2.))/zf;
if (vp->vert >= 1.0-FTINY)
vp->vert = 180.;
else
vp->vert = asin(vp->vert) / (PI/180./2.);
return;
}
}

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