src/rt/rv3.c

#ifndef lint
static const char       RCSid[] = "$Id: rv3.c,v 2.28 2008/09/05 21:34:09 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 unsigned long  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 = (unsigned long)p;
                rval = ray_pqueue(&thisray);
                if (!rval)
                        return(0);
                if (rval < 0)
                        return(-1);
                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 unsigned long    lastflush = 0;
                unsigned long           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 (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;
                                                /* change in nproc? */
        if (s != NULL && sscanf(s, "%d", &newnp) == 1 && newnp > 0) {
                if (!newparam) {
                        if (nproc == 1)
                                nproc = 0;      /* actually running */
                        if (newnp == 1)
                                ray_pclose(0);
                        else if (newnp < nproc)
                                ray_pclose(nproc - newnp);
                        else
                                ray_popen(newnp - nproc);
                }
                nproc = 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 (nproc > 1)
                        ray_popen(nproc);
                newparam = 0;
        }
        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:	2.29
Committed:	Tue Sep 16 18:35:56 2008 UTC (15 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.28:	+44 -24 lines
Log Message:	Modified procedure so -n 1 does not invoke subprocess
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.29	static const char RCSid[] = "$Id: rv3.c,v 2.28 2008/09/05 21:34:09 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	2.24	static unsigned long 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	2.22	thisray.rno = (unsigned long)p;
201			rval = ray_pqueue(&thisray);
202			if (!rval)
203			return(0);
204			if (rval < 0)
205			return(-1);
206			p = (PNODE *)thisray.rno;
207	greg	1.17	}
208	greg	1.1
209			copycolor(p->v, thisray.rcol);
210			scalecolor(p->v, exposure);
211
212	greg	2.26	recolor(p); /* paint it */
213	greg	1.13
214	greg	2.29	if (dev->flush != NULL) { /* shall we check for input? */
215			static unsigned long lastflush = 0;
216			unsigned long counter = raynum;
217			int flushintvl;
218			if (nproc == 1) {
219			counter = nrays;
220			flushintvl = WFLUSH1;
221			} else if (ambounce == 0)
222			flushintvl = nproc*WFLUSH;
223			else if (niflush < WFLUSH)
224			flushintvl = nproc*niflush/(ambounce+1);
225			else
226			flushintvl = nproc*WFLUSH/(ambounce+1);
227
228			if (counter - lastflush >= flushintvl) {
229			lastflush = counter;
230			(*dev->flush)();
231			niflush++;
232			}
233	greg	1.13	}
234	greg	2.22	return(1);
235			}
236
237
238			int
239	greg	2.24	waitrays(void) /* finish up pending rays */
240	greg	2.22	{
241			int nwaited = 0;
242			int rval;
243			RAY raydone;
244	greg	2.29
245			if (nproc == 1) /* immediate mode? */
246			return(0);
247	greg	2.22	while ((rval = ray_presult(&raydone, 0)) > 0) {
248			PNODE p = (PNODE )raydone.rno;
249			copycolor(p->v, raydone.rcol);
250			scalecolor(p->v, exposure);
251	greg	2.26	recolor(p);
252	greg	2.22	nwaited++;
253			}
254			if (rval < 0)
255			return(-1);
256			return(nwaited);
257	greg	1.1	}
258
259
260	greg	2.10	void
261	greg	2.22	newimage( /* start a new image */
262			char *s
263			)
264	greg	1.1	{
265	greg	2.29	extern int ray_pnprocs;
266			int newnp;
267	greg	2.22	/* change in nproc? */
268			if (s != NULL && sscanf(s, "%d", &newnp) == 1 && newnp > 0) {
269			if (!newparam) {
270	greg	2.29	if (nproc == 1)
271			nproc = 0; /* actually running */
272			if (newnp == 1)
273			ray_pclose(0);
274			else if (newnp < nproc)
275	greg	2.22	ray_pclose(nproc - newnp);
276			else
277			ray_popen(newnp - nproc);
278			}
279			nproc = newnp;
280			}
281	greg	1.1	/* free old image */
282			freepkids(&ptrunk);
283	greg	1.9	/* compute resolution */
284	greg	1.10	hresolu = dev->xsiz;
285			vresolu = dev->ysiz;
286	greg	1.11	normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
287	greg	2.22	ptrunk.xmin = ptrunk.ymin = pframe.l = pframe.d = 0;
288			ptrunk.xmax = pframe.r = hresolu;
289			ptrunk.ymax = pframe.u = vresolu;
290	greg	1.1	pdepth = 0;
291			/* clear device */
292	greg	1.9	(*dev->clear)(hresolu, vresolu);
293	greg	2.22
294			if (newparam) { /* (re)start rendering procs */
295	greg	2.29	if (ray_pnprocs > 0)
296			ray_pclose(0);
297			if (nproc > 1)
298			ray_popen(nproc);
299	greg	2.22	newparam = 0;
300			}
301	greg	2.23	niflush = 0; /* get first value */
302	greg	2.22	paint(&ptrunk);
303	greg	1.1	}
304
305
306	greg	2.10	void
307	greg	2.22	redraw(void) /* redraw the image */
308	greg	1.1	{
309	greg	1.9	(*dev->clear)(hresolu, vresolu);
310	greg	1.1	(*dev->comout)("redrawing...\n");
311	greg	1.9	repaint(0, 0, hresolu, vresolu);
312	greg	1.1	(*dev->comout)("\n");
313			}
314
315
316	greg	2.10	void
317	greg	2.22	repaint( /* repaint a region */
318			int xmin,
319			int ymin,
320			int xmax,
321			int ymax
322			)
323	greg	1.1	{
324			RECT reg;
325
326			reg.l = xmin; reg.r = xmax;
327			reg.d = ymin; reg.u = ymax;
328
329	greg	2.22	paintrect(&ptrunk, &reg);
330	greg	1.1	}
331
332
333	greg	2.10	void
334	greg	2.22	paintrect( /* paint picture rectangle */
335			PNODE *p,
336			RECT *r
337			)
338	greg	1.1	{
339			int mx, my;
340
341	greg	2.22	if (p->xmax - p->xmin <= 0 \|\| p->ymax - p->ymin <= 0)
342	greg	1.1	return;
343
344			if (p->kid == NULL) {
345			(*dev->paintr)(greyscale?greyof(p->v):p->v,
346	greg	2.22	p->xmin, p->ymin, p->xmax, p->ymax); /* do this */
347	greg	1.1	return;
348			}
349	greg	2.22	mx = (p->xmin + p->xmax) >> 1; /* do kids */
350			my = (p->ymin + p->ymax) >> 1;
351	greg	1.1	if (mx > r->l) {
352			if (my > r->d)
353	greg	2.22	paintrect(p->kid+DL, r);
354	greg	1.1	if (my < r->u)
355	greg	2.22	paintrect(p->kid+UL, r);
356	greg	1.1	}
357			if (mx < r->r) {
358			if (my > r->d)
359	greg	2.22	paintrect(p->kid+DR, r);
360	greg	1.1	if (my < r->u)
361	greg	2.22	paintrect(p->kid+UR, r);
362	greg	1.1	}
363			}
364
365
366			PNODE *
367	greg	2.22	findrect( /* find a rectangle */
368			int x,
369			int y,
370			PNODE *p,
371			int pd
372			)
373	greg	1.1	{
374			int mx, my;
375
376			while (p->kid != NULL && pd--) {
377
378	greg	2.22	mx = (p->xmin + p->xmax) >> 1;
379			my = (p->ymin + p->ymax) >> 1;
380	greg	1.1
381			if (x < mx) {
382			if (y < my) {
383			p = p->kid+DL;
384			} else {
385			p = p->kid+UL;
386			}
387			} else {
388			if (y < my) {
389			p = p->kid+DR;
390			} else {
391			p = p->kid+UR;
392			}
393			}
394			}
395			return(p);
396			}
397
398
399	greg	2.10	void
400	greg	2.27	compavg( /* recompute averages */
401			PNODE *p
402			)
403			{
404	greg	2.28	int i, navg;
405
406	greg	2.27	if (p->kid == NULL)
407			return;
408	greg	2.28
409	greg	2.27	setcolor(p->v, .0, .0, .0);
410	greg	2.28	navg = 0;
411			for (i = 0; i < 4; i++) {
412			if (p->kid[i].xmin >= p->kid[i].xmax) continue;
413			if (p->kid[i].ymin >= p->kid[i].ymax) continue;
414			compavg(p->kid+i);
415			addcolor(p->v, p->kid[i].v);
416			navg++;
417			}
418			if (navg > 1)
419			scalecolor(p->v, 1./navg);
420	greg	2.27	}
421
422
423			void
424	greg	2.22	scalepict( /* scale picture values */
425			PNODE *p,
426			double sf
427			)
428	greg	1.1	{
429			scalecolor(p->v, sf); /* do this node */
430
431			if (p->kid == NULL)
432			return;
433			/* do children */
434			scalepict(p->kid+DL, sf);
435			scalepict(p->kid+DR, sf);
436			scalepict(p->kid+UL, sf);
437			scalepict(p->kid+UR, sf);
438			}
439
440
441	greg	2.10	void
442	greg	2.22	getpictcolrs( /* get scanline from picture */
443			int yoff,
444			COLR *scan,
445			PNODE *p,
446			int xsiz,
447			int ysiz
448			)
449	greg	1.1	{
450	greg	2.22	int mx;
451	greg	1.1	int my;
452
453			if (p->kid == NULL) { /* do this node */
454			setcolr(scan[0], colval(p->v,RED),
455			colval(p->v,GRN),
456			colval(p->v,BLU));
457			for (mx = 1; mx < xsiz; mx++)
458			copycolr(scan[mx], scan[0]);
459			return;
460			}
461			/* do kids */
462			mx = xsiz >> 1;
463			my = ysiz >> 1;
464			if (yoff < my) {
465			getpictcolrs(yoff, scan, p->kid+DL, mx, my);
466			getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
467			} else {
468			getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
469			getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
470			}
471			}
472
473
474	greg	2.10	void
475	greg	2.22	freepkids( /* free pnode's children */
476			PNODE *p
477			)
478	greg	1.1	{
479			if (p->kid == NULL)
480			return;
481			freepkids(p->kid+DL);
482			freepkids(p->kid+DR);
483			freepkids(p->kid+UL);
484			freepkids(p->kid+UR);
485	greg	2.10	free((void *)p->kid);
486	greg	1.1	p->kid = NULL;
487			}
488
489
490	greg	2.10	void
491	greg	2.22	newview( /* change viewing parameters */
492			VIEW *vp
493			)
494	greg	1.1	{
495			char *err;
496
497	greg	1.6	if ((err = setview(vp)) != NULL) {
498	greg	1.1	sprintf(errmsg, "view not set - %s", err);
499			error(COMMAND, errmsg);
500	schorsch	2.12	} else if (memcmp((char )vp, (char )&ourview, sizeof(VIEW))) {
501	schorsch	2.13	oldview = ourview;
502			ourview = *vp;
503	greg	2.22	newimage(NULL);
504	greg	1.1	}
505			}
506
507
508	greg	2.10	void
509	greg	2.22	moveview( /* move viewpoint */
510			double angle,
511			double elev,
512			double mag,
513			FVECT vc
514			)
515	greg	1.1	{
516			double d;
517	greg	1.4	FVECT v1;
518	greg	2.14	VIEW nv = ourview;
519	greg	2.22	int i;
520	greg	1.1
521			spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
522	greg	1.4	if (elev != 0.0) {
523	greg	1.5	fcross(v1, ourview.vup, nv.vdir);
524	greg	1.4	normalize(v1);
525			spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
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	}