src/rt/rv3.c

#ifndef lint
static const char       RCSid[] = "$Id: rv3.c,v 2.40 2015/05/26 10:00:47 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  "source.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
)
{
        int  x, y;
        RAY  thisray;
        int  i;

        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)) {
                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) {
                        rayorigin(&thisray, PRIMARY, NULL, NULL);
                        while (localhit(&thisray, &thescene)) {
                                OBJREC  *m = findmaterial(thisray.ro);
                                if (m != NULL && !istransp(m->otype) &&
                                                !isBSDFproxy(m) &&
                                                (thisray.clipset == NULL ||
                                                        !inset(thisray.clipset,
                                                            thisray.ro->omod)))
                                        break;          /* found something */
                                VCOPY(thisray.rorg, thisray.rop);
                                rayclear(&thisray);     /* skip invisible */
                        }
                        if (thisray.ro == NULL) {
                                error(COMMAND, "not a local object");
                                return(-1);
                        }
                }
                if (direc)
                        if (ourview.type == VT_PAR)
                                for (i = 0; i < 3; i++)
                                        vec[i] = thisray.rop[i] - ourview.vp[i];
                        else
                                VCOPY(vec, thisray.rdir);
                else
                        VCOPY(vec, thisray.rop);
        } else if (direc) {
                for (i = 0; i < 3; i++)
                        vec[i] -= ourview.vp[i];
                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;
        }
}
Revision:	2.41
Committed:	Wed Nov 7 18:34:58 2018 UTC (6 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.40:	+16 -2 lines
Log Message:	Made picking of visible points in scene more reliable in rvu
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.41	static const char RCSid[] = "$Id: rv3.c,v 2.40 2015/05/26 10:00:47 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* rv3.c - miscellaneous routines for rview.
6			*
7	greg	2.10	* External symbols declared in rpaint.h
8			*/
9
10	greg	2.11	#include "copyright.h"
11	greg	1.1
12	schorsch	2.12	#include <string.h>
13
14	greg	1.1	#include "ray.h"
15			#include "rpaint.h"
16	greg	2.41	#include "otypes.h"
17			#include "otspecial.h"
18			#include "source.h"
19	greg	1.1	#include "random.h"
20	greg	1.7
21	greg	1.13	#ifndef WFLUSH
22	greg	2.29	#define WFLUSH 64 /* flush after this many primary rays */
23	greg	1.13	#endif
24	greg	2.29	#ifndef WFLUSH1
25			#define WFLUSH1 512 /* or this many total rays */
26			#endif
27
28	greg	1.7
29	greg	2.2	#ifdef SMLFLT
30			#define sscanvec(s,v) (sscanf(s,"%f %f %f",v,v+1,v+2)==3)
31			#else
32			#define sscanvec(s,v) (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
33			#endif
34	greg	1.13
35	greg	2.37	extern int ray_pnprocs;
36
37	greg	2.32	static RNUMBER niflush; /* flushes since newimage() */
38	greg	2.2
39	greg	2.10	int
40	greg	2.22	getrect( /* get a box */
41			char *s,
42			RECT *r
43			)
44	greg	1.7	{
45			int x0, y0, x1, y1;
46
47			if (*s && !strncmp(s, "all", strlen(s))) {
48			r->l = r->d = 0;
49	greg	1.9	r->r = hresolu;
50			r->u = vresolu;
51	greg	1.7	return(0);
52			}
53			if (sscanf(s, "%d %d %d %d", &x0, &y0, &x1, &y1) != 4) {
54			if (dev->getcur == NULL)
55			return(-1);
56			(*dev->comout)("Pick first corner\n");
57			if ((*dev->getcur)(&x0, &y0) == ABORT)
58			return(-1);
59			(*dev->comout)("Pick second corner\n");
60			if ((*dev->getcur)(&x1, &y1) == ABORT)
61			return(-1);
62			}
63			if (x0 < x1) {
64			r->l = x0;
65			r->r = x1;
66			} else {
67			r->l = x1;
68			r->r = x0;
69			}
70			if (y0 < y1) {
71			r->d = y0;
72			r->u = y1;
73			} else {
74			r->d = y1;
75			r->u = y0;
76			}
77			if (r->l < 0) r->l = 0;
78			if (r->d < 0) r->d = 0;
79	greg	1.9	if (r->r > hresolu) r->r = hresolu;
80			if (r->u > vresolu) r->u = vresolu;
81	greg	1.7	if (r->l > r->r) r->l = r->r;
82			if (r->d > r->u) r->d = r->u;
83			return(0);
84			}
85
86
87	greg	2.10	int
88	greg	2.22	getinterest( /* get area of interest */
89			char *s,
90			int direc,
91			FVECT vec,
92			double *mp
93			)
94	greg	1.7	{
95			int x, y;
96			RAY thisray;
97	greg	2.22	int i;
98	greg	1.7
99			if (sscanf(s, "%lf", mp) != 1)
100			*mp = 1.0;
101			else if (mp < -FTINY) / negative zoom is reduction */
102			mp = -1.0 / mp;
103			else if (mp <= FTINY) { / too small */
104			error(COMMAND, "illegal magnification");
105			return(-1);
106			}
107	greg	2.2	if (!sscanvec(sskip(s), vec)) {
108	greg	1.7	if (dev->getcur == NULL)
109			return(-1);
110			(*dev->comout)("Pick view center\n");
111			if ((*dev->getcur)(&x, &y) == ABORT)
112			return(-1);
113	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
114			&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
115	greg	1.17	error(COMMAND, "not on image");
116			return(-1);
117			}
118	greg	1.7	if (!direc \|\| ourview.type == VT_PAR) {
119	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
120	greg	2.41	while (localhit(&thisray, &thescene)) {
121			OBJREC *m = findmaterial(thisray.ro);
122			if (m != NULL && !istransp(m->otype) &&
123			!isBSDFproxy(m) &&
124			(thisray.clipset == NULL \|\|
125			!inset(thisray.clipset,
126			thisray.ro->omod)))
127			break; /* found something */
128			VCOPY(thisray.rorg, thisray.rop);
129			rayclear(&thisray); /* skip invisible */
130			}
131			if (thisray.ro == NULL) {
132	greg	1.7	error(COMMAND, "not a local object");
133			return(-1);
134			}
135			}
136			if (direc)
137			if (ourview.type == VT_PAR)
138			for (i = 0; i < 3; i++)
139			vec[i] = thisray.rop[i] - ourview.vp[i];
140			else
141			VCOPY(vec, thisray.rdir);
142			else
143			VCOPY(vec, thisray.rop);
144	greg	2.15	} else if (direc) {
145			for (i = 0; i < 3; i++)
146			vec[i] -= ourview.vp[i];
147			if (normalize(vec) == 0.0) {
148			error(COMMAND, "point at view origin");
149			return(-1);
150			}
151			}
152	greg	1.7	return(0);
153			}
154	greg	1.1
155
156	greg	2.39	COLORV *
157	greg	2.22	greyof( /* convert color to greyscale */
158			COLOR col
159			)
160	greg	1.1	{
161			static COLOR gcol;
162			double b;
163
164			b = bright(col);
165			setcolor(gcol, b, b, b);
166			return(gcol);
167			}
168
169	greg	2.26	static void
170			recolor( /* recolor the given node */
171			PNODE *p
172			)
173			{
174			while (p->kid != NULL) { /* need to propogate down */
175			int mx = (p->xmin + p->xmax) >> 1;
176			int my = (p->ymin + p->ymax) >> 1;
177			int ki;
178			if (p->x >= mx)
179			ki = (p->y >= my) ? UR : DR;
180			else
181			ki = (p->y >= my) ? UL : DL;
182			pcopy(p, p->kid+ki);
183			p = p->kid + ki;
184			}
185
186			(*dev->paintr)(greyscale?greyof(p->v):p->v,
187			p->xmin, p->ymin, p->xmax, p->ymax);
188			}
189	greg	1.1
190	greg	2.22	int
191			paint( /* compute and paint a rectangle */
192			PNODE *p
193			)
194	greg	1.1	{
195			static RAY thisray;
196			double h, v;
197
198	greg	2.29	if ((p->xmax <= p->xmin) \| (p->ymax <= p->ymin)) { /* empty */
199	greg	2.22	p->x = p->xmin;
200			p->y = p->ymin;
201	greg	1.1	setcolor(p->v, 0.0, 0.0, 0.0);
202	greg	2.22	return(0);
203	greg	1.1	}
204			/* jitter ray direction */
205	greg	2.22	p->x = h = p->xmin + (p->xmax-p->xmin)*frandom();
206			p->y = v = p->ymin + (p->ymax-p->ymin)*frandom();
207	greg	1.1
208	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
209			h/hresolu, v/vresolu)) < -FTINY) {
210	greg	1.17	setcolor(thisray.rcol, 0.0, 0.0, 0.0);
211	greg	2.37	} else if (!ray_pnprocs) { /* immediate mode */
212	greg	2.29	ray_trace(&thisray);
213			} else { /* queuing mode */
214			int rval;
215	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
216	greg	2.32	thisray.rno = (RNUMBER)p;
217	greg	2.22	rval = ray_pqueue(&thisray);
218			if (!rval)
219			return(0);
220			if (rval < 0)
221			return(-1);
222	greg	2.33	/* get node for returned ray */
223	greg	2.22	p = (PNODE *)thisray.rno;
224	greg	1.17	}
225	greg	1.1
226			copycolor(p->v, thisray.rcol);
227			scalecolor(p->v, exposure);
228
229	greg	2.26	recolor(p); /* paint it */
230	greg	1.13
231	greg	2.29	if (dev->flush != NULL) { /* shall we check for input? */
232	greg	2.32	static RNUMBER lastflush = 0;
233			RNUMBER counter = raynum;
234			int flushintvl;
235	greg	2.37	if (!ray_pnprocs) {
236	greg	2.29	counter = nrays;
237			flushintvl = WFLUSH1;
238			} else if (ambounce == 0)
239	greg	2.37	flushintvl = ray_pnprocs*WFLUSH;
240	greg	2.29	else if (niflush < WFLUSH)
241	greg	2.40	flushintvl = ray_pnprocsniflush/(ambounce(ambounce>0)+1);
242	greg	2.29	else
243	greg	2.40	flushintvl = ray_pnprocsWFLUSH/(ambounce(ambounce>0)+1);
244	greg	2.31	if (lastflush > counter)
245			lastflush = 0; /* counter wrapped */
246	greg	2.29
247			if (counter - lastflush >= flushintvl) {
248			lastflush = counter;
249			(*dev->flush)();
250			niflush++;
251			}
252	greg	1.13	}
253	greg	2.22	return(1);
254			}
255
256
257			int
258	greg	2.24	waitrays(void) /* finish up pending rays */
259	greg	2.22	{
260			int nwaited = 0;
261			int rval;
262			RAY raydone;
263	greg	2.29
264	greg	2.37	if (!ray_pnprocs) /* immediate mode? */
265	greg	2.29	return(0);
266	greg	2.22	while ((rval = ray_presult(&raydone, 0)) > 0) {
267			PNODE p = (PNODE )raydone.rno;
268			copycolor(p->v, raydone.rcol);
269			scalecolor(p->v, exposure);
270	greg	2.26	recolor(p);
271	greg	2.22	nwaited++;
272			}
273			if (rval < 0)
274			return(-1);
275			return(nwaited);
276	greg	1.1	}
277
278
279	greg	2.10	void
280	greg	2.22	newimage( /* start a new image */
281			char *s
282			)
283	greg	1.1	{
284	greg	2.35	int newnp = 0;
285			/* # rendering procs arg? */
286			if (s != NULL)
287			sscanf(s, "%d", &newnp);
288	greg	1.1	/* free old image */
289			freepkids(&ptrunk);
290	greg	1.9	/* compute resolution */
291	greg	1.10	hresolu = dev->xsiz;
292			vresolu = dev->ysiz;
293	greg	1.11	normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
294	greg	2.22	ptrunk.xmin = ptrunk.ymin = pframe.l = pframe.d = 0;
295			ptrunk.xmax = pframe.r = hresolu;
296			ptrunk.ymax = pframe.u = vresolu;
297	greg	1.1	pdepth = 0;
298			/* clear device */
299	greg	1.9	(*dev->clear)(hresolu, vresolu);
300	greg	2.22
301			if (newparam) { /* (re)start rendering procs */
302	greg	2.37	if (ray_pnprocs)
303			ray_pclose(0); /* should already be closed */
304	greg	2.35	if (newnp > 0)
305			nproc = newnp;
306	greg	2.29	if (nproc > 1)
307			ray_popen(nproc);
308	greg	2.22	newparam = 0;
309	greg	2.35	} else if ((newnp > 0) & (newnp != nproc)) {
310			if (newnp == 1) /* change # rendering procs */
311			ray_pclose(0);
312			else if (newnp < ray_pnprocs)
313			ray_pclose(ray_pnprocs - newnp);
314			else
315			ray_popen(newnp - ray_pnprocs);
316			nproc = newnp;
317	greg	2.22	}
318	greg	2.23	niflush = 0; /* get first value */
319	greg	2.22	paint(&ptrunk);
320	greg	1.1	}
321
322
323	greg	2.10	void
324	greg	2.22	redraw(void) /* redraw the image */
325	greg	1.1	{
326	greg	1.9	(*dev->clear)(hresolu, vresolu);
327	greg	1.1	(*dev->comout)("redrawing...\n");
328	greg	1.9	repaint(0, 0, hresolu, vresolu);
329	greg	1.1	(*dev->comout)("\n");
330			}
331
332
333	greg	2.10	void
334	greg	2.22	repaint( /* repaint a region */
335			int xmin,
336			int ymin,
337			int xmax,
338			int ymax
339			)
340	greg	1.1	{
341			RECT reg;
342
343			reg.l = xmin; reg.r = xmax;
344			reg.d = ymin; reg.u = ymax;
345
346	greg	2.22	paintrect(&ptrunk, &reg);
347	greg	1.1	}
348
349
350	greg	2.10	void
351	greg	2.22	paintrect( /* paint picture rectangle */
352			PNODE *p,
353			RECT *r
354			)
355	greg	1.1	{
356			int mx, my;
357
358	greg	2.22	if (p->xmax - p->xmin <= 0 \|\| p->ymax - p->ymin <= 0)
359	greg	1.1	return;
360
361			if (p->kid == NULL) {
362			(*dev->paintr)(greyscale?greyof(p->v):p->v,
363	greg	2.22	p->xmin, p->ymin, p->xmax, p->ymax); /* do this */
364	greg	1.1	return;
365			}
366	greg	2.22	mx = (p->xmin + p->xmax) >> 1; /* do kids */
367			my = (p->ymin + p->ymax) >> 1;
368	greg	1.1	if (mx > r->l) {
369			if (my > r->d)
370	greg	2.22	paintrect(p->kid+DL, r);
371	greg	1.1	if (my < r->u)
372	greg	2.22	paintrect(p->kid+UL, r);
373	greg	1.1	}
374			if (mx < r->r) {
375			if (my > r->d)
376	greg	2.22	paintrect(p->kid+DR, r);
377	greg	1.1	if (my < r->u)
378	greg	2.22	paintrect(p->kid+UR, r);
379	greg	1.1	}
380			}
381
382
383			PNODE *
384	greg	2.22	findrect( /* find a rectangle */
385			int x,
386			int y,
387			PNODE *p,
388			int pd
389			)
390	greg	1.1	{
391			int mx, my;
392
393			while (p->kid != NULL && pd--) {
394
395	greg	2.22	mx = (p->xmin + p->xmax) >> 1;
396			my = (p->ymin + p->ymax) >> 1;
397	greg	1.1
398			if (x < mx) {
399			if (y < my) {
400			p = p->kid+DL;
401			} else {
402			p = p->kid+UL;
403			}
404			} else {
405			if (y < my) {
406			p = p->kid+DR;
407			} else {
408			p = p->kid+UR;
409			}
410			}
411			}
412			return(p);
413			}
414
415
416	greg	2.10	void
417	greg	2.27	compavg( /* recompute averages */
418			PNODE *p
419			)
420			{
421	greg	2.28	int i, navg;
422
423	greg	2.27	if (p->kid == NULL)
424			return;
425	greg	2.28
426	greg	2.27	setcolor(p->v, .0, .0, .0);
427	greg	2.28	navg = 0;
428			for (i = 0; i < 4; i++) {
429			if (p->kid[i].xmin >= p->kid[i].xmax) continue;
430			if (p->kid[i].ymin >= p->kid[i].ymax) continue;
431			compavg(p->kid+i);
432			addcolor(p->v, p->kid[i].v);
433			navg++;
434			}
435			if (navg > 1)
436			scalecolor(p->v, 1./navg);
437	greg	2.27	}
438
439
440			void
441	greg	2.22	scalepict( /* scale picture values */
442			PNODE *p,
443			double sf
444			)
445	greg	1.1	{
446			scalecolor(p->v, sf); /* do this node */
447
448			if (p->kid == NULL)
449			return;
450			/* do children */
451			scalepict(p->kid+DL, sf);
452			scalepict(p->kid+DR, sf);
453			scalepict(p->kid+UL, sf);
454			scalepict(p->kid+UR, sf);
455			}
456
457
458	greg	2.10	void
459	greg	2.22	getpictcolrs( /* get scanline from picture */
460			int yoff,
461			COLR *scan,
462			PNODE *p,
463			int xsiz,
464			int ysiz
465			)
466	greg	1.1	{
467	greg	2.22	int mx;
468	greg	1.1	int my;
469
470			if (p->kid == NULL) { /* do this node */
471			setcolr(scan[0], colval(p->v,RED),
472			colval(p->v,GRN),
473			colval(p->v,BLU));
474			for (mx = 1; mx < xsiz; mx++)
475			copycolr(scan[mx], scan[0]);
476			return;
477			}
478			/* do kids */
479			mx = xsiz >> 1;
480			my = ysiz >> 1;
481			if (yoff < my) {
482			getpictcolrs(yoff, scan, p->kid+DL, mx, my);
483			getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
484			} else {
485			getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
486			getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
487			}
488			}
489
490
491	greg	2.10	void
492	greg	2.22	freepkids( /* free pnode's children */
493			PNODE *p
494			)
495	greg	1.1	{
496			if (p->kid == NULL)
497			return;
498			freepkids(p->kid+DL);
499			freepkids(p->kid+DR);
500			freepkids(p->kid+UL);
501			freepkids(p->kid+UR);
502	greg	2.10	free((void *)p->kid);
503	greg	1.1	p->kid = NULL;
504			}
505
506
507	greg	2.10	void
508	greg	2.22	newview( /* change viewing parameters */
509			VIEW *vp
510			)
511	greg	1.1	{
512			char *err;
513
514	greg	1.6	if ((err = setview(vp)) != NULL) {
515	greg	1.1	sprintf(errmsg, "view not set - %s", err);
516			error(COMMAND, errmsg);
517	schorsch	2.12	} else if (memcmp((char )vp, (char )&ourview, sizeof(VIEW))) {
518	schorsch	2.13	oldview = ourview;
519			ourview = *vp;
520	greg	2.22	newimage(NULL);
521	greg	1.1	}
522			}
523
524
525	greg	2.10	void
526	greg	2.22	moveview( /* move viewpoint */
527			double angle,
528			double elev,
529			double mag,
530			FVECT vc
531			)
532	greg	1.1	{
533			double d;
534	greg	2.14	VIEW nv = ourview;
535	greg	2.22	int i;
536	greg	1.1
537			spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
538	greg	2.38	if (elev != 0.0)
539			geodesic(nv.vdir, nv.vdir, nv.vup, elev*(-PI/180.), GEOD_RAD);
540
541	greg	2.15	if (nv.type == VT_PAR) {
542			nv.horiz /= mag;
543			nv.vert /= mag;
544	greg	1.3	d = 0.0; /* don't move closer */
545	greg	1.2	for (i = 0; i < 3; i++)
546	greg	1.3	d += (vc[i] - ourview.vp[i])*ourview.vdir[i];
547	greg	1.1	} else {
548	greg	1.2	d = sqrt(dist2(ourview.vp, vc)) / mag;
549	greg	2.15	if (nv.vfore > FTINY) {
550	greg	2.8	nv.vfore += d - d*mag;
551			if (nv.vfore < 0.0) nv.vfore = 0.0;
552			}
553	greg	2.15	if (nv.vaft > FTINY) {
554	greg	2.8	nv.vaft += d - d*mag;
555			if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
556			}
557	greg	2.16	nv.vdist /= mag;
558	greg	1.1	}
559	greg	1.2	for (i = 0; i < 3; i++)
560			nv.vp[i] = vc[i] - d*nv.vdir[i];
561	greg	1.1	newview(&nv);
562	greg	1.17	}
563
564
565	greg	2.10	void
566	greg	2.22	pcopy( /* copy paint node p1 into p2 */
567			PNODE *p1,
568			PNODE *p2
569			)
570	greg	2.10	{
571			copycolor(p2->v, p1->v);
572			p2->x = p1->x;
573			p2->y = p1->y;
574			}
575
576
577			void
578	greg	2.22	zoomview( /* zoom in or out */
579			VIEW *vp,
580			double zf
581			)
582	greg	1.17	{
583			switch (vp->type) {
584			case VT_PAR: /* parallel view */
585	greg	2.9	vp->horiz /= zf;
586			vp->vert /= zf;
587			return;
588	greg	1.17	case VT_ANG: /* angular fisheye */
589			vp->horiz /= zf;
590	greg	2.9	if (vp->horiz > 360.)
591			vp->horiz = 360.;
592	greg	1.17	vp->vert /= zf;
593	greg	2.9	if (vp->vert > 360.)
594			vp->vert = 360.;
595			return;
596	greg	2.21	case VT_PLS: /* planisphere fisheye */
597			vp->horiz = sin((PI/180./2.)*vp->horiz) /
598			(1.0 + cos((PI/180./2.)*vp->horiz)) / zf;
599			vp->horiz *= vp->horiz;
600			vp->horiz = (2.180./PI)acos((1. - vp->horiz) /
601			(1. + vp->horiz));
602			vp->vert = sin((PI/180./2.)*vp->vert) /
603			(1.0 + cos((PI/180./2.)*vp->vert)) / zf;
604			vp->vert *= vp->vert;
605			vp->vert = (2.180./PI)acos((1. - vp->vert) /
606			(1. + vp->vert));
607			return;
608	greg	2.9	case VT_CYL: /* cylindrical panorama */
609			vp->horiz /= zf;
610			if (vp->horiz > 360.)
611			vp->horiz = 360.;
612			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.);
613	greg	1.17	return;
614			case VT_PER: /* perspective view */
615			vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
616			(PI/180./2.);
617			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
618			(PI/180./2.);
619			return;
620			case VT_HEM: /* hemispherical fisheye */
621			vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
622			if (vp->horiz >= 1.0-FTINY)
623			vp->horiz = 180.;
624			else
625			vp->horiz = asin(vp->horiz) / (PI/180./2.);
626			vp->vert = sin(vp->vert*(PI/180./2.))/zf;
627			if (vp->vert >= 1.0-FTINY)
628			vp->vert = 180.;
629			else
630			vp->vert = asin(vp->vert) / (PI/180./2.);
631			return;
632			}
633	greg	1.1	}