src/rt/rv3.c

#ifndef lint
static const char       RCSid[] = "$Id: rv3.c,v 2.37 2012/03/20 03:37:08 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  "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);
                        if (!localhit(&thisray, &thescene)) {
                                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);
}


float *         /* keep consistent with COLOR typedef */
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+1);
                else
                        flushintvl = ray_pnprocs*WFLUSH/(ambounce+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:	2.38
Committed:	Thu Sep 6 00:07:43 2012 UTC (11 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad4R2P2, rad4R2, rad4R2P1
Changes since 2.37:	+4 -7 lines
Log Message:	Created geodesic() function for vector rotation along great circles
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.38	static const char RCSid[] = "$Id: rv3.c,v 2.37 2012/03/20 03:37:08 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			#include "random.h"
17	greg	1.7
18	greg	1.13	#ifndef WFLUSH
19	greg	2.29	#define WFLUSH 64 /* flush after this many primary rays */
20	greg	1.13	#endif
21	greg	2.29	#ifndef WFLUSH1
22			#define WFLUSH1 512 /* or this many total rays */
23			#endif
24
25	greg	1.7
26	greg	2.2	#ifdef SMLFLT
27			#define sscanvec(s,v) (sscanf(s,"%f %f %f",v,v+1,v+2)==3)
28			#else
29			#define sscanvec(s,v) (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
30			#endif
31	greg	1.13
32	greg	2.37	extern int ray_pnprocs;
33
34	greg	2.32	static RNUMBER niflush; /* flushes since newimage() */
35	greg	2.2
36	greg	2.10	int
37	greg	2.22	getrect( /* get a box */
38			char *s,
39			RECT *r
40			)
41	greg	1.7	{
42			int x0, y0, x1, y1;
43
44			if (*s && !strncmp(s, "all", strlen(s))) {
45			r->l = r->d = 0;
46	greg	1.9	r->r = hresolu;
47			r->u = vresolu;
48	greg	1.7	return(0);
49			}
50			if (sscanf(s, "%d %d %d %d", &x0, &y0, &x1, &y1) != 4) {
51			if (dev->getcur == NULL)
52			return(-1);
53			(*dev->comout)("Pick first corner\n");
54			if ((*dev->getcur)(&x0, &y0) == ABORT)
55			return(-1);
56			(*dev->comout)("Pick second corner\n");
57			if ((*dev->getcur)(&x1, &y1) == ABORT)
58			return(-1);
59			}
60			if (x0 < x1) {
61			r->l = x0;
62			r->r = x1;
63			} else {
64			r->l = x1;
65			r->r = x0;
66			}
67			if (y0 < y1) {
68			r->d = y0;
69			r->u = y1;
70			} else {
71			r->d = y1;
72			r->u = y0;
73			}
74			if (r->l < 0) r->l = 0;
75			if (r->d < 0) r->d = 0;
76	greg	1.9	if (r->r > hresolu) r->r = hresolu;
77			if (r->u > vresolu) r->u = vresolu;
78	greg	1.7	if (r->l > r->r) r->l = r->r;
79			if (r->d > r->u) r->d = r->u;
80			return(0);
81			}
82
83
84	greg	2.10	int
85	greg	2.22	getinterest( /* get area of interest */
86			char *s,
87			int direc,
88			FVECT vec,
89			double *mp
90			)
91	greg	1.7	{
92			int x, y;
93			RAY thisray;
94	greg	2.22	int i;
95	greg	1.7
96			if (sscanf(s, "%lf", mp) != 1)
97			*mp = 1.0;
98			else if (mp < -FTINY) / negative zoom is reduction */
99			mp = -1.0 / mp;
100			else if (mp <= FTINY) { / too small */
101			error(COMMAND, "illegal magnification");
102			return(-1);
103			}
104	greg	2.2	if (!sscanvec(sskip(s), vec)) {
105	greg	1.7	if (dev->getcur == NULL)
106			return(-1);
107			(*dev->comout)("Pick view center\n");
108			if ((*dev->getcur)(&x, &y) == ABORT)
109			return(-1);
110	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
111			&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
112	greg	1.17	error(COMMAND, "not on image");
113			return(-1);
114			}
115	greg	1.7	if (!direc \|\| ourview.type == VT_PAR) {
116	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
117	greg	1.7	if (!localhit(&thisray, &thescene)) {
118			error(COMMAND, "not a local object");
119			return(-1);
120			}
121			}
122			if (direc)
123			if (ourview.type == VT_PAR)
124			for (i = 0; i < 3; i++)
125			vec[i] = thisray.rop[i] - ourview.vp[i];
126			else
127			VCOPY(vec, thisray.rdir);
128			else
129			VCOPY(vec, thisray.rop);
130	greg	2.15	} else if (direc) {
131			for (i = 0; i < 3; i++)
132			vec[i] -= ourview.vp[i];
133			if (normalize(vec) == 0.0) {
134			error(COMMAND, "point at view origin");
135			return(-1);
136			}
137			}
138	greg	1.7	return(0);
139			}
140	greg	1.1
141
142			float * /* keep consistent with COLOR typedef */
143	greg	2.22	greyof( /* convert color to greyscale */
144			COLOR col
145			)
146	greg	1.1	{
147			static COLOR gcol;
148			double b;
149
150			b = bright(col);
151			setcolor(gcol, b, b, b);
152			return(gcol);
153			}
154
155	greg	2.26	static void
156			recolor( /* recolor the given node */
157			PNODE *p
158			)
159			{
160			while (p->kid != NULL) { /* need to propogate down */
161			int mx = (p->xmin + p->xmax) >> 1;
162			int my = (p->ymin + p->ymax) >> 1;
163			int ki;
164			if (p->x >= mx)
165			ki = (p->y >= my) ? UR : DR;
166			else
167			ki = (p->y >= my) ? UL : DL;
168			pcopy(p, p->kid+ki);
169			p = p->kid + ki;
170			}
171
172			(*dev->paintr)(greyscale?greyof(p->v):p->v,
173			p->xmin, p->ymin, p->xmax, p->ymax);
174			}
175	greg	1.1
176	greg	2.22	int
177			paint( /* compute and paint a rectangle */
178			PNODE *p
179			)
180	greg	1.1	{
181			static RAY thisray;
182			double h, v;
183
184	greg	2.29	if ((p->xmax <= p->xmin) \| (p->ymax <= p->ymin)) { /* empty */
185	greg	2.22	p->x = p->xmin;
186			p->y = p->ymin;
187	greg	1.1	setcolor(p->v, 0.0, 0.0, 0.0);
188	greg	2.22	return(0);
189	greg	1.1	}
190			/* jitter ray direction */
191	greg	2.22	p->x = h = p->xmin + (p->xmax-p->xmin)*frandom();
192			p->y = v = p->ymin + (p->ymax-p->ymin)*frandom();
193	greg	1.1
194	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
195			h/hresolu, v/vresolu)) < -FTINY) {
196	greg	1.17	setcolor(thisray.rcol, 0.0, 0.0, 0.0);
197	greg	2.37	} else if (!ray_pnprocs) { /* immediate mode */
198	greg	2.29	ray_trace(&thisray);
199			} else { /* queuing mode */
200			int rval;
201	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
202	greg	2.32	thisray.rno = (RNUMBER)p;
203	greg	2.22	rval = ray_pqueue(&thisray);
204			if (!rval)
205			return(0);
206			if (rval < 0)
207			return(-1);
208	greg	2.33	/* get node for returned ray */
209	greg	2.22	p = (PNODE *)thisray.rno;
210	greg	1.17	}
211	greg	1.1
212			copycolor(p->v, thisray.rcol);
213			scalecolor(p->v, exposure);
214
215	greg	2.26	recolor(p); /* paint it */
216	greg	1.13
217	greg	2.29	if (dev->flush != NULL) { /* shall we check for input? */
218	greg	2.32	static RNUMBER lastflush = 0;
219			RNUMBER counter = raynum;
220			int flushintvl;
221	greg	2.37	if (!ray_pnprocs) {
222	greg	2.29	counter = nrays;
223			flushintvl = WFLUSH1;
224			} else if (ambounce == 0)
225	greg	2.37	flushintvl = ray_pnprocs*WFLUSH;
226	greg	2.29	else if (niflush < WFLUSH)
227	greg	2.37	flushintvl = ray_pnprocs*niflush/(ambounce+1);
228	greg	2.29	else
229	greg	2.37	flushintvl = ray_pnprocs*WFLUSH/(ambounce+1);
230	greg	2.31	if (lastflush > counter)
231			lastflush = 0; /* counter wrapped */
232	greg	2.29
233			if (counter - lastflush >= flushintvl) {
234			lastflush = counter;
235			(*dev->flush)();
236			niflush++;
237			}
238	greg	1.13	}
239	greg	2.22	return(1);
240			}
241
242
243			int
244	greg	2.24	waitrays(void) /* finish up pending rays */
245	greg	2.22	{
246			int nwaited = 0;
247			int rval;
248			RAY raydone;
249	greg	2.29
250	greg	2.37	if (!ray_pnprocs) /* immediate mode? */
251	greg	2.29	return(0);
252	greg	2.22	while ((rval = ray_presult(&raydone, 0)) > 0) {
253			PNODE p = (PNODE )raydone.rno;
254			copycolor(p->v, raydone.rcol);
255			scalecolor(p->v, exposure);
256	greg	2.26	recolor(p);
257	greg	2.22	nwaited++;
258			}
259			if (rval < 0)
260			return(-1);
261			return(nwaited);
262	greg	1.1	}
263
264
265	greg	2.10	void
266	greg	2.22	newimage( /* start a new image */
267			char *s
268			)
269	greg	1.1	{
270	greg	2.35	int newnp = 0;
271			/* # rendering procs arg? */
272			if (s != NULL)
273			sscanf(s, "%d", &newnp);
274	greg	1.1	/* free old image */
275			freepkids(&ptrunk);
276	greg	1.9	/* compute resolution */
277	greg	1.10	hresolu = dev->xsiz;
278			vresolu = dev->ysiz;
279	greg	1.11	normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
280	greg	2.22	ptrunk.xmin = ptrunk.ymin = pframe.l = pframe.d = 0;
281			ptrunk.xmax = pframe.r = hresolu;
282			ptrunk.ymax = pframe.u = vresolu;
283	greg	1.1	pdepth = 0;
284			/* clear device */
285	greg	1.9	(*dev->clear)(hresolu, vresolu);
286	greg	2.22
287			if (newparam) { /* (re)start rendering procs */
288	greg	2.37	if (ray_pnprocs)
289			ray_pclose(0); /* should already be closed */
290	greg	2.35	if (newnp > 0)
291			nproc = newnp;
292	greg	2.29	if (nproc > 1)
293			ray_popen(nproc);
294	greg	2.22	newparam = 0;
295	greg	2.35	} else if ((newnp > 0) & (newnp != nproc)) {
296			if (newnp == 1) /* change # rendering procs */
297			ray_pclose(0);
298			else if (newnp < ray_pnprocs)
299			ray_pclose(ray_pnprocs - newnp);
300			else
301			ray_popen(newnp - ray_pnprocs);
302			nproc = newnp;
303	greg	2.22	}
304	greg	2.23	niflush = 0; /* get first value */
305	greg	2.22	paint(&ptrunk);
306	greg	1.1	}
307
308
309	greg	2.10	void
310	greg	2.22	redraw(void) /* redraw the image */
311	greg	1.1	{
312	greg	1.9	(*dev->clear)(hresolu, vresolu);
313	greg	1.1	(*dev->comout)("redrawing...\n");
314	greg	1.9	repaint(0, 0, hresolu, vresolu);
315	greg	1.1	(*dev->comout)("\n");
316			}
317
318
319	greg	2.10	void
320	greg	2.22	repaint( /* repaint a region */
321			int xmin,
322			int ymin,
323			int xmax,
324			int ymax
325			)
326	greg	1.1	{
327			RECT reg;
328
329			reg.l = xmin; reg.r = xmax;
330			reg.d = ymin; reg.u = ymax;
331
332	greg	2.22	paintrect(&ptrunk, &reg);
333	greg	1.1	}
334
335
336	greg	2.10	void
337	greg	2.22	paintrect( /* paint picture rectangle */
338			PNODE *p,
339			RECT *r
340			)
341	greg	1.1	{
342			int mx, my;
343
344	greg	2.22	if (p->xmax - p->xmin <= 0 \|\| p->ymax - p->ymin <= 0)
345	greg	1.1	return;
346
347			if (p->kid == NULL) {
348			(*dev->paintr)(greyscale?greyof(p->v):p->v,
349	greg	2.22	p->xmin, p->ymin, p->xmax, p->ymax); /* do this */
350	greg	1.1	return;
351			}
352	greg	2.22	mx = (p->xmin + p->xmax) >> 1; /* do kids */
353			my = (p->ymin + p->ymax) >> 1;
354	greg	1.1	if (mx > r->l) {
355			if (my > r->d)
356	greg	2.22	paintrect(p->kid+DL, r);
357	greg	1.1	if (my < r->u)
358	greg	2.22	paintrect(p->kid+UL, r);
359	greg	1.1	}
360			if (mx < r->r) {
361			if (my > r->d)
362	greg	2.22	paintrect(p->kid+DR, r);
363	greg	1.1	if (my < r->u)
364	greg	2.22	paintrect(p->kid+UR, r);
365	greg	1.1	}
366			}
367
368
369			PNODE *
370	greg	2.22	findrect( /* find a rectangle */
371			int x,
372			int y,
373			PNODE *p,
374			int pd
375			)
376	greg	1.1	{
377			int mx, my;
378
379			while (p->kid != NULL && pd--) {
380
381	greg	2.22	mx = (p->xmin + p->xmax) >> 1;
382			my = (p->ymin + p->ymax) >> 1;
383	greg	1.1
384			if (x < mx) {
385			if (y < my) {
386			p = p->kid+DL;
387			} else {
388			p = p->kid+UL;
389			}
390			} else {
391			if (y < my) {
392			p = p->kid+DR;
393			} else {
394			p = p->kid+UR;
395			}
396			}
397			}
398			return(p);
399			}
400
401
402	greg	2.10	void
403	greg	2.27	compavg( /* recompute averages */
404			PNODE *p
405			)
406			{
407	greg	2.28	int i, navg;
408
409	greg	2.27	if (p->kid == NULL)
410			return;
411	greg	2.28
412	greg	2.27	setcolor(p->v, .0, .0, .0);
413	greg	2.28	navg = 0;
414			for (i = 0; i < 4; i++) {
415			if (p->kid[i].xmin >= p->kid[i].xmax) continue;
416			if (p->kid[i].ymin >= p->kid[i].ymax) continue;
417			compavg(p->kid+i);
418			addcolor(p->v, p->kid[i].v);
419			navg++;
420			}
421			if (navg > 1)
422			scalecolor(p->v, 1./navg);
423	greg	2.27	}
424
425
426			void
427	greg	2.22	scalepict( /* scale picture values */
428			PNODE *p,
429			double sf
430			)
431	greg	1.1	{
432			scalecolor(p->v, sf); /* do this node */
433
434			if (p->kid == NULL)
435			return;
436			/* do children */
437			scalepict(p->kid+DL, sf);
438			scalepict(p->kid+DR, sf);
439			scalepict(p->kid+UL, sf);
440			scalepict(p->kid+UR, sf);
441			}
442
443
444	greg	2.10	void
445	greg	2.22	getpictcolrs( /* get scanline from picture */
446			int yoff,
447			COLR *scan,
448			PNODE *p,
449			int xsiz,
450			int ysiz
451			)
452	greg	1.1	{
453	greg	2.22	int mx;
454	greg	1.1	int my;
455
456			if (p->kid == NULL) { /* do this node */
457			setcolr(scan[0], colval(p->v,RED),
458			colval(p->v,GRN),
459			colval(p->v,BLU));
460			for (mx = 1; mx < xsiz; mx++)
461			copycolr(scan[mx], scan[0]);
462			return;
463			}
464			/* do kids */
465			mx = xsiz >> 1;
466			my = ysiz >> 1;
467			if (yoff < my) {
468			getpictcolrs(yoff, scan, p->kid+DL, mx, my);
469			getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
470			} else {
471			getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
472			getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
473			}
474			}
475
476
477	greg	2.10	void
478	greg	2.22	freepkids( /* free pnode's children */
479			PNODE *p
480			)
481	greg	1.1	{
482			if (p->kid == NULL)
483			return;
484			freepkids(p->kid+DL);
485			freepkids(p->kid+DR);
486			freepkids(p->kid+UL);
487			freepkids(p->kid+UR);
488	greg	2.10	free((void *)p->kid);
489	greg	1.1	p->kid = NULL;
490			}
491
492
493	greg	2.10	void
494	greg	2.22	newview( /* change viewing parameters */
495			VIEW *vp
496			)
497	greg	1.1	{
498			char *err;
499
500	greg	1.6	if ((err = setview(vp)) != NULL) {
501	greg	1.1	sprintf(errmsg, "view not set - %s", err);
502			error(COMMAND, errmsg);
503	schorsch	2.12	} else if (memcmp((char )vp, (char )&ourview, sizeof(VIEW))) {
504	schorsch	2.13	oldview = ourview;
505			ourview = *vp;
506	greg	2.22	newimage(NULL);
507	greg	1.1	}
508			}
509
510
511	greg	2.10	void
512	greg	2.22	moveview( /* move viewpoint */
513			double angle,
514			double elev,
515			double mag,
516			FVECT vc
517			)
518	greg	1.1	{
519			double d;
520	greg	2.14	VIEW nv = ourview;
521	greg	2.22	int i;
522	greg	1.1
523			spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
524	greg	2.38	if (elev != 0.0)
525			geodesic(nv.vdir, nv.vdir, nv.vup, elev*(-PI/180.), GEOD_RAD);
526
527	greg	2.15	if (nv.type == VT_PAR) {
528			nv.horiz /= mag;
529			nv.vert /= mag;
530	greg	1.3	d = 0.0; /* don't move closer */
531	greg	1.2	for (i = 0; i < 3; i++)
532	greg	1.3	d += (vc[i] - ourview.vp[i])*ourview.vdir[i];
533	greg	1.1	} else {
534	greg	1.2	d = sqrt(dist2(ourview.vp, vc)) / mag;
535	greg	2.15	if (nv.vfore > FTINY) {
536	greg	2.8	nv.vfore += d - d*mag;
537			if (nv.vfore < 0.0) nv.vfore = 0.0;
538			}
539	greg	2.15	if (nv.vaft > FTINY) {
540	greg	2.8	nv.vaft += d - d*mag;
541			if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
542			}
543	greg	2.16	nv.vdist /= mag;
544	greg	1.1	}
545	greg	1.2	for (i = 0; i < 3; i++)
546			nv.vp[i] = vc[i] - d*nv.vdir[i];
547	greg	1.1	newview(&nv);
548	greg	1.17	}
549
550
551	greg	2.10	void
552	greg	2.22	pcopy( /* copy paint node p1 into p2 */
553			PNODE *p1,
554			PNODE *p2
555			)
556	greg	2.10	{
557			copycolor(p2->v, p1->v);
558			p2->x = p1->x;
559			p2->y = p1->y;
560			}
561
562
563			void
564	greg	2.22	zoomview( /* zoom in or out */
565			VIEW *vp,
566			double zf
567			)
568	greg	1.17	{
569			switch (vp->type) {
570			case VT_PAR: /* parallel view */
571	greg	2.9	vp->horiz /= zf;
572			vp->vert /= zf;
573			return;
574	greg	1.17	case VT_ANG: /* angular fisheye */
575			vp->horiz /= zf;
576	greg	2.9	if (vp->horiz > 360.)
577			vp->horiz = 360.;
578	greg	1.17	vp->vert /= zf;
579	greg	2.9	if (vp->vert > 360.)
580			vp->vert = 360.;
581			return;
582	greg	2.21	case VT_PLS: /* planisphere fisheye */
583			vp->horiz = sin((PI/180./2.)*vp->horiz) /
584			(1.0 + cos((PI/180./2.)*vp->horiz)) / zf;
585			vp->horiz *= vp->horiz;
586			vp->horiz = (2.180./PI)acos((1. - vp->horiz) /
587			(1. + vp->horiz));
588			vp->vert = sin((PI/180./2.)*vp->vert) /
589			(1.0 + cos((PI/180./2.)*vp->vert)) / zf;
590			vp->vert *= vp->vert;
591			vp->vert = (2.180./PI)acos((1. - vp->vert) /
592			(1. + vp->vert));
593			return;
594	greg	2.9	case VT_CYL: /* cylindrical panorama */
595			vp->horiz /= zf;
596			if (vp->horiz > 360.)
597			vp->horiz = 360.;
598			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.);
599	greg	1.17	return;
600			case VT_PER: /* perspective view */
601			vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
602			(PI/180./2.);
603			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
604			(PI/180./2.);
605			return;
606			case VT_HEM: /* hemispherical fisheye */
607			vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
608			if (vp->horiz >= 1.0-FTINY)
609			vp->horiz = 180.;
610			else
611			vp->horiz = asin(vp->horiz) / (PI/180./2.);
612			vp->vert = sin(vp->vert*(PI/180./2.))/zf;
613			if (vp->vert >= 1.0-FTINY)
614			vp->vert = 180.;
615			else
616			vp->vert = asin(vp->vert) / (PI/180./2.);
617			return;
618			}
619	greg	1.1	}