src/rt/rv3.c

#ifndef lint
static const char       RCSid[] = "$Id: rv3.c,v 2.34 2010/10/09 22:38:35 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

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 (nproc == 1) {                /* 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 (nproc == 1) {
                        counter = nrays;
                        flushintvl = WFLUSH1;
                } else if (ambounce == 0)
                        flushintvl = nproc*WFLUSH;
                else if (niflush < WFLUSH)
                        flushintvl = nproc*niflush/(ambounce+1);
                else
                        flushintvl = nproc*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 (nproc <= 1)                         /* 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
)
{
        extern int      ray_pnprocs;
        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 > 0)
                        ray_pclose(0);
                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;
        FVECT  v1;
        VIEW  nv = ourview;
        int  i;

        spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
        if (elev != 0.0) {
                fcross(v1, ourview.vup, nv.vdir);
                normalize(v1);
                spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
        }
        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:	2.35
Committed:	Sat Oct 16 15:08:14 2010 UTC (13 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad4R1
Changes since 2.34:	+15 -15 lines
Log Message:	Simplified process handling logic in newimage()
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.35	static const char RCSid[] = "$Id: rv3.c,v 2.34 2010/10/09 22:38:35 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	2.32	static RNUMBER niflush; /* flushes since newimage() */
33	greg	2.2
34	greg	2.10	int
35	greg	2.22	getrect( /* get a box */
36			char *s,
37			RECT *r
38			)
39	greg	1.7	{
40			int x0, y0, x1, y1;
41
42			if (*s && !strncmp(s, "all", strlen(s))) {
43			r->l = r->d = 0;
44	greg	1.9	r->r = hresolu;
45			r->u = vresolu;
46	greg	1.7	return(0);
47			}
48			if (sscanf(s, "%d %d %d %d", &x0, &y0, &x1, &y1) != 4) {
49			if (dev->getcur == NULL)
50			return(-1);
51			(*dev->comout)("Pick first corner\n");
52			if ((*dev->getcur)(&x0, &y0) == ABORT)
53			return(-1);
54			(*dev->comout)("Pick second corner\n");
55			if ((*dev->getcur)(&x1, &y1) == ABORT)
56			return(-1);
57			}
58			if (x0 < x1) {
59			r->l = x0;
60			r->r = x1;
61			} else {
62			r->l = x1;
63			r->r = x0;
64			}
65			if (y0 < y1) {
66			r->d = y0;
67			r->u = y1;
68			} else {
69			r->d = y1;
70			r->u = y0;
71			}
72			if (r->l < 0) r->l = 0;
73			if (r->d < 0) r->d = 0;
74	greg	1.9	if (r->r > hresolu) r->r = hresolu;
75			if (r->u > vresolu) r->u = vresolu;
76	greg	1.7	if (r->l > r->r) r->l = r->r;
77			if (r->d > r->u) r->d = r->u;
78			return(0);
79			}
80
81
82	greg	2.10	int
83	greg	2.22	getinterest( /* get area of interest */
84			char *s,
85			int direc,
86			FVECT vec,
87			double *mp
88			)
89	greg	1.7	{
90			int x, y;
91			RAY thisray;
92	greg	2.22	int i;
93	greg	1.7
94			if (sscanf(s, "%lf", mp) != 1)
95			*mp = 1.0;
96			else if (mp < -FTINY) / negative zoom is reduction */
97			mp = -1.0 / mp;
98			else if (mp <= FTINY) { / too small */
99			error(COMMAND, "illegal magnification");
100			return(-1);
101			}
102	greg	2.2	if (!sscanvec(sskip(s), vec)) {
103	greg	1.7	if (dev->getcur == NULL)
104			return(-1);
105			(*dev->comout)("Pick view center\n");
106			if ((*dev->getcur)(&x, &y) == ABORT)
107			return(-1);
108	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
109			&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
110	greg	1.17	error(COMMAND, "not on image");
111			return(-1);
112			}
113	greg	1.7	if (!direc \|\| ourview.type == VT_PAR) {
114	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
115	greg	1.7	if (!localhit(&thisray, &thescene)) {
116			error(COMMAND, "not a local object");
117			return(-1);
118			}
119			}
120			if (direc)
121			if (ourview.type == VT_PAR)
122			for (i = 0; i < 3; i++)
123			vec[i] = thisray.rop[i] - ourview.vp[i];
124			else
125			VCOPY(vec, thisray.rdir);
126			else
127			VCOPY(vec, thisray.rop);
128	greg	2.15	} else if (direc) {
129			for (i = 0; i < 3; i++)
130			vec[i] -= ourview.vp[i];
131			if (normalize(vec) == 0.0) {
132			error(COMMAND, "point at view origin");
133			return(-1);
134			}
135			}
136	greg	1.7	return(0);
137			}
138	greg	1.1
139
140			float * /* keep consistent with COLOR typedef */
141	greg	2.22	greyof( /* convert color to greyscale */
142			COLOR col
143			)
144	greg	1.1	{
145			static COLOR gcol;
146			double b;
147
148			b = bright(col);
149			setcolor(gcol, b, b, b);
150			return(gcol);
151			}
152
153	greg	2.26	static void
154			recolor( /* recolor the given node */
155			PNODE *p
156			)
157			{
158			while (p->kid != NULL) { /* need to propogate down */
159			int mx = (p->xmin + p->xmax) >> 1;
160			int my = (p->ymin + p->ymax) >> 1;
161			int ki;
162			if (p->x >= mx)
163			ki = (p->y >= my) ? UR : DR;
164			else
165			ki = (p->y >= my) ? UL : DL;
166			pcopy(p, p->kid+ki);
167			p = p->kid + ki;
168			}
169
170			(*dev->paintr)(greyscale?greyof(p->v):p->v,
171			p->xmin, p->ymin, p->xmax, p->ymax);
172			}
173	greg	1.1
174	greg	2.22	int
175			paint( /* compute and paint a rectangle */
176			PNODE *p
177			)
178	greg	1.1	{
179			static RAY thisray;
180			double h, v;
181
182	greg	2.29	if ((p->xmax <= p->xmin) \| (p->ymax <= p->ymin)) { /* empty */
183	greg	2.22	p->x = p->xmin;
184			p->y = p->ymin;
185	greg	1.1	setcolor(p->v, 0.0, 0.0, 0.0);
186	greg	2.22	return(0);
187	greg	1.1	}
188			/* jitter ray direction */
189	greg	2.22	p->x = h = p->xmin + (p->xmax-p->xmin)*frandom();
190			p->y = v = p->ymin + (p->ymax-p->ymin)*frandom();
191	greg	1.1
192	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
193			h/hresolu, v/vresolu)) < -FTINY) {
194	greg	1.17	setcolor(thisray.rcol, 0.0, 0.0, 0.0);
195	greg	2.29	} else if (nproc == 1) { /* immediate mode */
196			ray_trace(&thisray);
197			} else { /* queuing mode */
198			int rval;
199	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
200	greg	2.32	thisray.rno = (RNUMBER)p;
201	greg	2.22	rval = ray_pqueue(&thisray);
202			if (!rval)
203			return(0);
204			if (rval < 0)
205			return(-1);
206	greg	2.33	/* get node for returned ray */
207	greg	2.22	p = (PNODE *)thisray.rno;
208	greg	1.17	}
209	greg	1.1
210			copycolor(p->v, thisray.rcol);
211			scalecolor(p->v, exposure);
212
213	greg	2.26	recolor(p); /* paint it */
214	greg	1.13
215	greg	2.29	if (dev->flush != NULL) { /* shall we check for input? */
216	greg	2.32	static RNUMBER lastflush = 0;
217			RNUMBER counter = raynum;
218			int flushintvl;
219	greg	2.29	if (nproc == 1) {
220			counter = nrays;
221			flushintvl = WFLUSH1;
222			} else if (ambounce == 0)
223			flushintvl = nproc*WFLUSH;
224			else if (niflush < WFLUSH)
225			flushintvl = nproc*niflush/(ambounce+1);
226			else
227			flushintvl = nproc*WFLUSH/(ambounce+1);
228	greg	2.31	if (lastflush > counter)
229			lastflush = 0; /* counter wrapped */
230	greg	2.29
231			if (counter - lastflush >= flushintvl) {
232			lastflush = counter;
233			(*dev->flush)();
234			niflush++;
235			}
236	greg	1.13	}
237	greg	2.22	return(1);
238			}
239
240
241			int
242	greg	2.24	waitrays(void) /* finish up pending rays */
243	greg	2.22	{
244			int nwaited = 0;
245			int rval;
246			RAY raydone;
247	greg	2.29
248	greg	2.30	if (nproc <= 1) /* immediate mode? */
249	greg	2.29	return(0);
250	greg	2.22	while ((rval = ray_presult(&raydone, 0)) > 0) {
251			PNODE p = (PNODE )raydone.rno;
252			copycolor(p->v, raydone.rcol);
253			scalecolor(p->v, exposure);
254	greg	2.26	recolor(p);
255	greg	2.22	nwaited++;
256			}
257			if (rval < 0)
258			return(-1);
259			return(nwaited);
260	greg	1.1	}
261
262
263	greg	2.10	void
264	greg	2.22	newimage( /* start a new image */
265			char *s
266			)
267	greg	1.1	{
268	greg	2.29	extern int ray_pnprocs;
269	greg	2.35	int newnp = 0;
270			/* # rendering procs arg? */
271			if (s != NULL)
272			sscanf(s, "%d", &newnp);
273	greg	1.1	/* free old image */
274			freepkids(&ptrunk);
275	greg	1.9	/* compute resolution */
276	greg	1.10	hresolu = dev->xsiz;
277			vresolu = dev->ysiz;
278	greg	1.11	normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
279	greg	2.22	ptrunk.xmin = ptrunk.ymin = pframe.l = pframe.d = 0;
280			ptrunk.xmax = pframe.r = hresolu;
281			ptrunk.ymax = pframe.u = vresolu;
282	greg	1.1	pdepth = 0;
283			/* clear device */
284	greg	1.9	(*dev->clear)(hresolu, vresolu);
285	greg	2.22
286			if (newparam) { /* (re)start rendering procs */
287	greg	2.29	if (ray_pnprocs > 0)
288			ray_pclose(0);
289	greg	2.35	if (newnp > 0)
290			nproc = newnp;
291	greg	2.29	if (nproc > 1)
292			ray_popen(nproc);
293	greg	2.22	newparam = 0;
294	greg	2.35	} else if ((newnp > 0) & (newnp != nproc)) {
295			if (newnp == 1) /* change # rendering procs */
296			ray_pclose(0);
297			else if (newnp < ray_pnprocs)
298			ray_pclose(ray_pnprocs - newnp);
299			else
300			ray_popen(newnp - ray_pnprocs);
301			nproc = newnp;
302	greg	2.22	}
303	greg	2.23	niflush = 0; /* get first value */
304	greg	2.22	paint(&ptrunk);
305	greg	1.1	}
306
307
308	greg	2.10	void
309	greg	2.22	redraw(void) /* redraw the image */
310	greg	1.1	{
311	greg	1.9	(*dev->clear)(hresolu, vresolu);
312	greg	1.1	(*dev->comout)("redrawing...\n");
313	greg	1.9	repaint(0, 0, hresolu, vresolu);
314	greg	1.1	(*dev->comout)("\n");
315			}
316
317
318	greg	2.10	void
319	greg	2.22	repaint( /* repaint a region */
320			int xmin,
321			int ymin,
322			int xmax,
323			int ymax
324			)
325	greg	1.1	{
326			RECT reg;
327
328			reg.l = xmin; reg.r = xmax;
329			reg.d = ymin; reg.u = ymax;
330
331	greg	2.22	paintrect(&ptrunk, &reg);
332	greg	1.1	}
333
334
335	greg	2.10	void
336	greg	2.22	paintrect( /* paint picture rectangle */
337			PNODE *p,
338			RECT *r
339			)
340	greg	1.1	{
341			int mx, my;
342
343	greg	2.22	if (p->xmax - p->xmin <= 0 \|\| p->ymax - p->ymin <= 0)
344	greg	1.1	return;
345
346			if (p->kid == NULL) {
347			(*dev->paintr)(greyscale?greyof(p->v):p->v,
348	greg	2.22	p->xmin, p->ymin, p->xmax, p->ymax); /* do this */
349	greg	1.1	return;
350			}
351	greg	2.22	mx = (p->xmin + p->xmax) >> 1; /* do kids */
352			my = (p->ymin + p->ymax) >> 1;
353	greg	1.1	if (mx > r->l) {
354			if (my > r->d)
355	greg	2.22	paintrect(p->kid+DL, r);
356	greg	1.1	if (my < r->u)
357	greg	2.22	paintrect(p->kid+UL, r);
358	greg	1.1	}
359			if (mx < r->r) {
360			if (my > r->d)
361	greg	2.22	paintrect(p->kid+DR, r);
362	greg	1.1	if (my < r->u)
363	greg	2.22	paintrect(p->kid+UR, r);
364	greg	1.1	}
365			}
366
367
368			PNODE *
369	greg	2.22	findrect( /* find a rectangle */
370			int x,
371			int y,
372			PNODE *p,
373			int pd
374			)
375	greg	1.1	{
376			int mx, my;
377
378			while (p->kid != NULL && pd--) {
379
380	greg	2.22	mx = (p->xmin + p->xmax) >> 1;
381			my = (p->ymin + p->ymax) >> 1;
382	greg	1.1
383			if (x < mx) {
384			if (y < my) {
385			p = p->kid+DL;
386			} else {
387			p = p->kid+UL;
388			}
389			} else {
390			if (y < my) {
391			p = p->kid+DR;
392			} else {
393			p = p->kid+UR;
394			}
395			}
396			}
397			return(p);
398			}
399
400
401	greg	2.10	void
402	greg	2.27	compavg( /* recompute averages */
403			PNODE *p
404			)
405			{
406	greg	2.28	int i, navg;
407
408	greg	2.27	if (p->kid == NULL)
409			return;
410	greg	2.28
411	greg	2.27	setcolor(p->v, .0, .0, .0);
412	greg	2.28	navg = 0;
413			for (i = 0; i < 4; i++) {
414			if (p->kid[i].xmin >= p->kid[i].xmax) continue;
415			if (p->kid[i].ymin >= p->kid[i].ymax) continue;
416			compavg(p->kid+i);
417			addcolor(p->v, p->kid[i].v);
418			navg++;
419			}
420			if (navg > 1)
421			scalecolor(p->v, 1./navg);
422	greg	2.27	}
423
424
425			void
426	greg	2.22	scalepict( /* scale picture values */
427			PNODE *p,
428			double sf
429			)
430	greg	1.1	{
431			scalecolor(p->v, sf); /* do this node */
432
433			if (p->kid == NULL)
434			return;
435			/* do children */
436			scalepict(p->kid+DL, sf);
437			scalepict(p->kid+DR, sf);
438			scalepict(p->kid+UL, sf);
439			scalepict(p->kid+UR, sf);
440			}
441
442
443	greg	2.10	void
444	greg	2.22	getpictcolrs( /* get scanline from picture */
445			int yoff,
446			COLR *scan,
447			PNODE *p,
448			int xsiz,
449			int ysiz
450			)
451	greg	1.1	{
452	greg	2.22	int mx;
453	greg	1.1	int my;
454
455			if (p->kid == NULL) { /* do this node */
456			setcolr(scan[0], colval(p->v,RED),
457			colval(p->v,GRN),
458			colval(p->v,BLU));
459			for (mx = 1; mx < xsiz; mx++)
460			copycolr(scan[mx], scan[0]);
461			return;
462			}
463			/* do kids */
464			mx = xsiz >> 1;
465			my = ysiz >> 1;
466			if (yoff < my) {
467			getpictcolrs(yoff, scan, p->kid+DL, mx, my);
468			getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
469			} else {
470			getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
471			getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
472			}
473			}
474
475
476	greg	2.10	void
477	greg	2.22	freepkids( /* free pnode's children */
478			PNODE *p
479			)
480	greg	1.1	{
481			if (p->kid == NULL)
482			return;
483			freepkids(p->kid+DL);
484			freepkids(p->kid+DR);
485			freepkids(p->kid+UL);
486			freepkids(p->kid+UR);
487	greg	2.10	free((void *)p->kid);
488	greg	1.1	p->kid = NULL;
489			}
490
491
492	greg	2.10	void
493	greg	2.22	newview( /* change viewing parameters */
494			VIEW *vp
495			)
496	greg	1.1	{
497			char *err;
498
499	greg	1.6	if ((err = setview(vp)) != NULL) {
500	greg	1.1	sprintf(errmsg, "view not set - %s", err);
501			error(COMMAND, errmsg);
502	schorsch	2.12	} else if (memcmp((char )vp, (char )&ourview, sizeof(VIEW))) {
503	schorsch	2.13	oldview = ourview;
504			ourview = *vp;
505	greg	2.22	newimage(NULL);
506	greg	1.1	}
507			}
508
509
510	greg	2.10	void
511	greg	2.22	moveview( /* move viewpoint */
512			double angle,
513			double elev,
514			double mag,
515			FVECT vc
516			)
517	greg	1.1	{
518			double d;
519	greg	1.4	FVECT v1;
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	1.4	if (elev != 0.0) {
525	greg	1.5	fcross(v1, ourview.vup, nv.vdir);
526	greg	1.4	normalize(v1);
527			spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
528			}
529	greg	2.15	if (nv.type == VT_PAR) {
530			nv.horiz /= mag;
531			nv.vert /= mag;
532	greg	1.3	d = 0.0; /* don't move closer */
533	greg	1.2	for (i = 0; i < 3; i++)
534	greg	1.3	d += (vc[i] - ourview.vp[i])*ourview.vdir[i];
535	greg	1.1	} else {
536	greg	1.2	d = sqrt(dist2(ourview.vp, vc)) / mag;
537	greg	2.15	if (nv.vfore > FTINY) {
538	greg	2.8	nv.vfore += d - d*mag;
539			if (nv.vfore < 0.0) nv.vfore = 0.0;
540			}
541	greg	2.15	if (nv.vaft > FTINY) {
542	greg	2.8	nv.vaft += d - d*mag;
543			if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
544			}
545	greg	2.16	nv.vdist /= mag;
546	greg	1.1	}
547	greg	1.2	for (i = 0; i < 3; i++)
548			nv.vp[i] = vc[i] - d*nv.vdir[i];
549	greg	1.1	newview(&nv);
550	greg	1.17	}
551
552
553	greg	2.10	void
554	greg	2.22	pcopy( /* copy paint node p1 into p2 */
555			PNODE *p1,
556			PNODE *p2
557			)
558	greg	2.10	{
559			copycolor(p2->v, p1->v);
560			p2->x = p1->x;
561			p2->y = p1->y;
562			}
563
564
565			void
566	greg	2.22	zoomview( /* zoom in or out */
567			VIEW *vp,
568			double zf
569			)
570	greg	1.17	{
571			switch (vp->type) {
572			case VT_PAR: /* parallel view */
573	greg	2.9	vp->horiz /= zf;
574			vp->vert /= zf;
575			return;
576	greg	1.17	case VT_ANG: /* angular fisheye */
577			vp->horiz /= zf;
578	greg	2.9	if (vp->horiz > 360.)
579			vp->horiz = 360.;
580	greg	1.17	vp->vert /= zf;
581	greg	2.9	if (vp->vert > 360.)
582			vp->vert = 360.;
583			return;
584	greg	2.21	case VT_PLS: /* planisphere fisheye */
585			vp->horiz = sin((PI/180./2.)*vp->horiz) /
586			(1.0 + cos((PI/180./2.)*vp->horiz)) / zf;
587			vp->horiz *= vp->horiz;
588			vp->horiz = (2.180./PI)acos((1. - vp->horiz) /
589			(1. + vp->horiz));
590			vp->vert = sin((PI/180./2.)*vp->vert) /
591			(1.0 + cos((PI/180./2.)*vp->vert)) / zf;
592			vp->vert *= vp->vert;
593			vp->vert = (2.180./PI)acos((1. - vp->vert) /
594			(1. + vp->vert));
595			return;
596	greg	2.9	case VT_CYL: /* cylindrical panorama */
597			vp->horiz /= zf;
598			if (vp->horiz > 360.)
599			vp->horiz = 360.;
600			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.);
601	greg	1.17	return;
602			case VT_PER: /* perspective view */
603			vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
604			(PI/180./2.);
605			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
606			(PI/180./2.);
607			return;
608			case VT_HEM: /* hemispherical fisheye */
609			vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
610			if (vp->horiz >= 1.0-FTINY)
611			vp->horiz = 180.;
612			else
613			vp->horiz = asin(vp->horiz) / (PI/180./2.);
614			vp->vert = sin(vp->vert*(PI/180./2.))/zf;
615			if (vp->vert >= 1.0-FTINY)
616			vp->vert = 180.;
617			else
618			vp->vert = asin(vp->vert) / (PI/180./2.);
619			return;
620			}
621	greg	1.1	}