src/rt/rv3.c

#ifndef lint
static const char       RCSid[] = "$Id: rv3.c,v 2.24 2008/08/22 17:39:26 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 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);
}


int
paint(                  /* compute and paint a rectangle */
        PNODE  *p
)
{
        extern int  ray_pnprocs;
        static unsigned long  lastflush = 0;
        static RAY  thisray;
        int     flushintvl;
        double  h, v;

        if (p->xmax - p->xmin <= 0 || p->ymax - p->ymin <= 0) { /* 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 {
                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);

        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);

        if (ambounce <= 0)                      /* shall we check for input? */
                flushintvl = ray_pnprocs*WFLUSH;
        else if (niflush < WFLUSH)
                flushintvl = ray_pnprocs*niflush/(ambounce+1);
        else
                flushintvl = ray_pnprocs*WFLUSH/(ambounce+1);

        if (dev->flush != NULL && raynum - lastflush >= flushintvl) {
                lastflush = raynum;
                (*dev->flush)();
                niflush++;
        }
        return(1);
}


int
waitrays(void)                                  /* finish up pending rays */
{
        int     nwaited = 0;
        int     rval;
        RAY     raydone;
        
        while ((rval = ray_presult(&raydone, 0)) > 0) {
                PNODE  *p = (PNODE *)raydone.rno;
                copycolor(p->v, raydone.rcol);
                scalecolor(p->v, exposure);
                (*dev->paintr)(greyscale?greyof(p->v):p->v,
                                p->xmin, p->ymin, p->xmax, p->ymax);
                nwaited++;
        }
        if (rval < 0)
                return(-1);
        return(nwaited);
}


void
newimage(                                       /* start a new image */
        char *s
)
{
        int     newnp;
                                                /* change in nproc? */
        if (s != NULL && sscanf(s, "%d", &newnp) == 1 && newnp > 0) {
                if (!newparam) {
                        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 */
                ray_pclose(0);
                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
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:	2.25
Committed:	Thu Aug 28 23:50:39 2008 UTC (15 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.24:	+13 -1 lines
Log Message:	Fixed bug in redraw for multiprocessing operation
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.25	static const char RCSid[] = "$Id: rv3.c,v 2.24 2008/08/22 17:39:26 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	2.22	#define WFLUSH 64 /* flush after this many rays */
20	greg	1.13	#endif
21	greg	1.7
22	greg	2.2	#ifdef SMLFLT
23			#define sscanvec(s,v) (sscanf(s,"%f %f %f",v,v+1,v+2)==3)
24			#else
25			#define sscanvec(s,v) (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
26			#endif
27	greg	1.13
28	greg	2.24	static unsigned long niflush; /* flushes since newimage() */
29	greg	2.2
30	greg	2.10	int
31	greg	2.22	getrect( /* get a box */
32			char *s,
33			RECT *r
34			)
35	greg	1.7	{
36			int x0, y0, x1, y1;
37
38			if (*s && !strncmp(s, "all", strlen(s))) {
39			r->l = r->d = 0;
40	greg	1.9	r->r = hresolu;
41			r->u = vresolu;
42	greg	1.7	return(0);
43			}
44			if (sscanf(s, "%d %d %d %d", &x0, &y0, &x1, &y1) != 4) {
45			if (dev->getcur == NULL)
46			return(-1);
47			(*dev->comout)("Pick first corner\n");
48			if ((*dev->getcur)(&x0, &y0) == ABORT)
49			return(-1);
50			(*dev->comout)("Pick second corner\n");
51			if ((*dev->getcur)(&x1, &y1) == ABORT)
52			return(-1);
53			}
54			if (x0 < x1) {
55			r->l = x0;
56			r->r = x1;
57			} else {
58			r->l = x1;
59			r->r = x0;
60			}
61			if (y0 < y1) {
62			r->d = y0;
63			r->u = y1;
64			} else {
65			r->d = y1;
66			r->u = y0;
67			}
68			if (r->l < 0) r->l = 0;
69			if (r->d < 0) r->d = 0;
70	greg	1.9	if (r->r > hresolu) r->r = hresolu;
71			if (r->u > vresolu) r->u = vresolu;
72	greg	1.7	if (r->l > r->r) r->l = r->r;
73			if (r->d > r->u) r->d = r->u;
74			return(0);
75			}
76
77
78	greg	2.10	int
79	greg	2.22	getinterest( /* get area of interest */
80			char *s,
81			int direc,
82			FVECT vec,
83			double *mp
84			)
85	greg	1.7	{
86			int x, y;
87			RAY thisray;
88	greg	2.22	int i;
89	greg	1.7
90			if (sscanf(s, "%lf", mp) != 1)
91			*mp = 1.0;
92			else if (mp < -FTINY) / negative zoom is reduction */
93			mp = -1.0 / mp;
94			else if (mp <= FTINY) { / too small */
95			error(COMMAND, "illegal magnification");
96			return(-1);
97			}
98	greg	2.2	if (!sscanvec(sskip(s), vec)) {
99	greg	1.7	if (dev->getcur == NULL)
100			return(-1);
101			(*dev->comout)("Pick view center\n");
102			if ((*dev->getcur)(&x, &y) == ABORT)
103			return(-1);
104	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
105			&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
106	greg	1.17	error(COMMAND, "not on image");
107			return(-1);
108			}
109	greg	1.7	if (!direc \|\| ourview.type == VT_PAR) {
110	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
111	greg	1.7	if (!localhit(&thisray, &thescene)) {
112			error(COMMAND, "not a local object");
113			return(-1);
114			}
115			}
116			if (direc)
117			if (ourview.type == VT_PAR)
118			for (i = 0; i < 3; i++)
119			vec[i] = thisray.rop[i] - ourview.vp[i];
120			else
121			VCOPY(vec, thisray.rdir);
122			else
123			VCOPY(vec, thisray.rop);
124	greg	2.15	} else if (direc) {
125			for (i = 0; i < 3; i++)
126			vec[i] -= ourview.vp[i];
127			if (normalize(vec) == 0.0) {
128			error(COMMAND, "point at view origin");
129			return(-1);
130			}
131			}
132	greg	1.7	return(0);
133			}
134	greg	1.1
135
136			float * /* keep consistent with COLOR typedef */
137	greg	2.22	greyof( /* convert color to greyscale */
138			COLOR col
139			)
140	greg	1.1	{
141			static COLOR gcol;
142			double b;
143
144			b = bright(col);
145			setcolor(gcol, b, b, b);
146			return(gcol);
147			}
148
149
150	greg	2.22	int
151			paint( /* compute and paint a rectangle */
152			PNODE *p
153			)
154	greg	1.1	{
155	greg	2.22	extern int ray_pnprocs;
156	greg	2.5	static unsigned long lastflush = 0;
157	greg	1.1	static RAY thisray;
158	greg	2.24	int flushintvl;
159	greg	1.1	double h, v;
160
161	greg	2.22	if (p->xmax - p->xmin <= 0 \|\| p->ymax - p->ymin <= 0) { /* empty */
162			p->x = p->xmin;
163			p->y = p->ymin;
164	greg	1.1	setcolor(p->v, 0.0, 0.0, 0.0);
165	greg	2.22	return(0);
166	greg	1.1	}
167			/* jitter ray direction */
168	greg	2.22	p->x = h = p->xmin + (p->xmax-p->xmin)*frandom();
169			p->y = v = p->ymin + (p->ymax-p->ymin)*frandom();
170	greg	1.1
171	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
172			h/hresolu, v/vresolu)) < -FTINY) {
173	greg	1.17	setcolor(thisray.rcol, 0.0, 0.0, 0.0);
174			} else {
175	greg	2.22	int rval;
176	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
177	greg	2.22	thisray.rno = (unsigned long)p;
178			rval = ray_pqueue(&thisray);
179			if (!rval)
180			return(0);
181			if (rval < 0)
182			return(-1);
183			p = (PNODE *)thisray.rno;
184	greg	1.17	}
185	greg	1.1
186			copycolor(p->v, thisray.rcol);
187			scalecolor(p->v, exposure);
188
189	greg	2.25	while (p->kid != NULL) { /* need to propogate down */
190			int mx = (p->xmin + p->xmax) >> 1;
191			int my = (p->ymin + p->ymax) >> 1;
192			int ki;
193			if (p->x >= mx)
194			ki = (p->y >= my) ? UR : DR;
195			else
196			ki = (p->y >= my) ? UL : DL;
197			pcopy(p, p->kid+ki);
198			p = p->kid + ki;
199			}
200
201	greg	2.23	(*dev->paintr)(greyscale?greyof(p->v):p->v,
202			p->xmin, p->ymin, p->xmax, p->ymax);
203	greg	1.13
204	greg	2.24	if (ambounce <= 0) /* shall we check for input? */
205			flushintvl = ray_pnprocs*WFLUSH;
206			else if (niflush < WFLUSH)
207			flushintvl = ray_pnprocs*niflush/(ambounce+1);
208			else
209			flushintvl = ray_pnprocs*WFLUSH/(ambounce+1);
210
211			if (dev->flush != NULL && raynum - lastflush >= flushintvl) {
212	greg	2.22	lastflush = raynum;
213	greg	1.13	(*dev->flush)();
214	greg	2.23	niflush++;
215	greg	1.13	}
216	greg	2.22	return(1);
217			}
218
219
220			int
221	greg	2.24	waitrays(void) /* finish up pending rays */
222	greg	2.22	{
223			int nwaited = 0;
224			int rval;
225			RAY raydone;
226
227			while ((rval = ray_presult(&raydone, 0)) > 0) {
228			PNODE p = (PNODE )raydone.rno;
229			copycolor(p->v, raydone.rcol);
230			scalecolor(p->v, exposure);
231			(*dev->paintr)(greyscale?greyof(p->v):p->v,
232			p->xmin, p->ymin, p->xmax, p->ymax);
233			nwaited++;
234			}
235			if (rval < 0)
236			return(-1);
237			return(nwaited);
238	greg	1.1	}
239
240
241	greg	2.10	void
242	greg	2.22	newimage( /* start a new image */
243			char *s
244			)
245	greg	1.1	{
246	greg	2.22	int newnp;
247			/* change in nproc? */
248			if (s != NULL && sscanf(s, "%d", &newnp) == 1 && newnp > 0) {
249			if (!newparam) {
250			if (newnp < nproc)
251			ray_pclose(nproc - newnp);
252			else
253			ray_popen(newnp - nproc);
254			}
255			nproc = newnp;
256			}
257	greg	1.1	/* free old image */
258			freepkids(&ptrunk);
259	greg	1.9	/* compute resolution */
260	greg	1.10	hresolu = dev->xsiz;
261			vresolu = dev->ysiz;
262	greg	1.11	normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
263	greg	2.22	ptrunk.xmin = ptrunk.ymin = pframe.l = pframe.d = 0;
264			ptrunk.xmax = pframe.r = hresolu;
265			ptrunk.ymax = pframe.u = vresolu;
266	greg	1.1	pdepth = 0;
267			/* clear device */
268	greg	1.9	(*dev->clear)(hresolu, vresolu);
269	greg	2.22
270			if (newparam) { /* (re)start rendering procs */
271			ray_pclose(0);
272			ray_popen(nproc);
273			newparam = 0;
274			}
275	greg	2.23	niflush = 0; /* get first value */
276	greg	2.22	paint(&ptrunk);
277	greg	1.1	}
278
279
280	greg	2.10	void
281	greg	2.22	redraw(void) /* redraw the image */
282	greg	1.1	{
283	greg	1.9	(*dev->clear)(hresolu, vresolu);
284	greg	1.1	(*dev->comout)("redrawing...\n");
285	greg	1.9	repaint(0, 0, hresolu, vresolu);
286	greg	1.1	(*dev->comout)("\n");
287			}
288
289
290	greg	2.10	void
291	greg	2.22	repaint( /* repaint a region */
292			int xmin,
293			int ymin,
294			int xmax,
295			int ymax
296			)
297	greg	1.1	{
298			RECT reg;
299
300			reg.l = xmin; reg.r = xmax;
301			reg.d = ymin; reg.u = ymax;
302
303	greg	2.22	paintrect(&ptrunk, &reg);
304	greg	1.1	}
305
306
307	greg	2.10	void
308	greg	2.22	paintrect( /* paint picture rectangle */
309			PNODE *p,
310			RECT *r
311			)
312	greg	1.1	{
313			int mx, my;
314
315	greg	2.22	if (p->xmax - p->xmin <= 0 \|\| p->ymax - p->ymin <= 0)
316	greg	1.1	return;
317
318			if (p->kid == NULL) {
319			(*dev->paintr)(greyscale?greyof(p->v):p->v,
320	greg	2.22	p->xmin, p->ymin, p->xmax, p->ymax); /* do this */
321	greg	1.1	return;
322			}
323	greg	2.22	mx = (p->xmin + p->xmax) >> 1; /* do kids */
324			my = (p->ymin + p->ymax) >> 1;
325	greg	1.1	if (mx > r->l) {
326			if (my > r->d)
327	greg	2.22	paintrect(p->kid+DL, r);
328	greg	1.1	if (my < r->u)
329	greg	2.22	paintrect(p->kid+UL, r);
330	greg	1.1	}
331			if (mx < r->r) {
332			if (my > r->d)
333	greg	2.22	paintrect(p->kid+DR, r);
334	greg	1.1	if (my < r->u)
335	greg	2.22	paintrect(p->kid+UR, r);
336	greg	1.1	}
337			}
338
339
340			PNODE *
341	greg	2.22	findrect( /* find a rectangle */
342			int x,
343			int y,
344			PNODE *p,
345			int pd
346			)
347	greg	1.1	{
348			int mx, my;
349
350			while (p->kid != NULL && pd--) {
351
352	greg	2.22	mx = (p->xmin + p->xmax) >> 1;
353			my = (p->ymin + p->ymax) >> 1;
354	greg	1.1
355			if (x < mx) {
356			if (y < my) {
357			p = p->kid+DL;
358			} else {
359			p = p->kid+UL;
360			}
361			} else {
362			if (y < my) {
363			p = p->kid+DR;
364			} else {
365			p = p->kid+UR;
366			}
367			}
368			}
369			return(p);
370			}
371
372
373	greg	2.10	void
374	greg	2.22	scalepict( /* scale picture values */
375			PNODE *p,
376			double sf
377			)
378	greg	1.1	{
379			scalecolor(p->v, sf); /* do this node */
380
381			if (p->kid == NULL)
382			return;
383			/* do children */
384			scalepict(p->kid+DL, sf);
385			scalepict(p->kid+DR, sf);
386			scalepict(p->kid+UL, sf);
387			scalepict(p->kid+UR, sf);
388			}
389
390
391	greg	2.10	void
392	greg	2.22	getpictcolrs( /* get scanline from picture */
393			int yoff,
394			COLR *scan,
395			PNODE *p,
396			int xsiz,
397			int ysiz
398			)
399	greg	1.1	{
400	greg	2.22	int mx;
401	greg	1.1	int my;
402
403			if (p->kid == NULL) { /* do this node */
404			setcolr(scan[0], colval(p->v,RED),
405			colval(p->v,GRN),
406			colval(p->v,BLU));
407			for (mx = 1; mx < xsiz; mx++)
408			copycolr(scan[mx], scan[0]);
409			return;
410			}
411			/* do kids */
412			mx = xsiz >> 1;
413			my = ysiz >> 1;
414			if (yoff < my) {
415			getpictcolrs(yoff, scan, p->kid+DL, mx, my);
416			getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
417			} else {
418			getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
419			getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
420			}
421			}
422
423
424	greg	2.10	void
425	greg	2.22	freepkids( /* free pnode's children */
426			PNODE *p
427			)
428	greg	1.1	{
429			if (p->kid == NULL)
430			return;
431			freepkids(p->kid+DL);
432			freepkids(p->kid+DR);
433			freepkids(p->kid+UL);
434			freepkids(p->kid+UR);
435	greg	2.10	free((void *)p->kid);
436	greg	1.1	p->kid = NULL;
437			}
438
439
440	greg	2.10	void
441	greg	2.22	newview( /* change viewing parameters */
442			VIEW *vp
443			)
444	greg	1.1	{
445			char *err;
446
447	greg	1.6	if ((err = setview(vp)) != NULL) {
448	greg	1.1	sprintf(errmsg, "view not set - %s", err);
449			error(COMMAND, errmsg);
450	schorsch	2.12	} else if (memcmp((char )vp, (char )&ourview, sizeof(VIEW))) {
451	schorsch	2.13	oldview = ourview;
452			ourview = *vp;
453	greg	2.22	newimage(NULL);
454	greg	1.1	}
455			}
456
457
458	greg	2.10	void
459	greg	2.22	moveview( /* move viewpoint */
460			double angle,
461			double elev,
462			double mag,
463			FVECT vc
464			)
465	greg	1.1	{
466			double d;
467	greg	1.4	FVECT v1;
468	greg	2.14	VIEW nv = ourview;
469	greg	2.22	int i;
470	greg	1.1
471			spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
472	greg	1.4	if (elev != 0.0) {
473	greg	1.5	fcross(v1, ourview.vup, nv.vdir);
474	greg	1.4	normalize(v1);
475			spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
476			}
477	greg	2.15	if (nv.type == VT_PAR) {
478			nv.horiz /= mag;
479			nv.vert /= mag;
480	greg	1.3	d = 0.0; /* don't move closer */
481	greg	1.2	for (i = 0; i < 3; i++)
482	greg	1.3	d += (vc[i] - ourview.vp[i])*ourview.vdir[i];
483	greg	1.1	} else {
484	greg	1.2	d = sqrt(dist2(ourview.vp, vc)) / mag;
485	greg	2.15	if (nv.vfore > FTINY) {
486	greg	2.8	nv.vfore += d - d*mag;
487			if (nv.vfore < 0.0) nv.vfore = 0.0;
488			}
489	greg	2.15	if (nv.vaft > FTINY) {
490	greg	2.8	nv.vaft += d - d*mag;
491			if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
492			}
493	greg	2.16	nv.vdist /= mag;
494	greg	1.1	}
495	greg	1.2	for (i = 0; i < 3; i++)
496			nv.vp[i] = vc[i] - d*nv.vdir[i];
497	greg	1.1	newview(&nv);
498	greg	1.17	}
499
500
501	greg	2.10	void
502	greg	2.22	pcopy( /* copy paint node p1 into p2 */
503			PNODE *p1,
504			PNODE *p2
505			)
506	greg	2.10	{
507			copycolor(p2->v, p1->v);
508			p2->x = p1->x;
509			p2->y = p1->y;
510			}
511
512
513			void
514	greg	2.22	zoomview( /* zoom in or out */
515			VIEW *vp,
516			double zf
517			)
518	greg	1.17	{
519			switch (vp->type) {
520			case VT_PAR: /* parallel view */
521	greg	2.9	vp->horiz /= zf;
522			vp->vert /= zf;
523			return;
524	greg	1.17	case VT_ANG: /* angular fisheye */
525			vp->horiz /= zf;
526	greg	2.9	if (vp->horiz > 360.)
527			vp->horiz = 360.;
528	greg	1.17	vp->vert /= zf;
529	greg	2.9	if (vp->vert > 360.)
530			vp->vert = 360.;
531			return;
532	greg	2.21	case VT_PLS: /* planisphere fisheye */
533			vp->horiz = sin((PI/180./2.)*vp->horiz) /
534			(1.0 + cos((PI/180./2.)*vp->horiz)) / zf;
535			vp->horiz *= vp->horiz;
536			vp->horiz = (2.180./PI)acos((1. - vp->horiz) /
537			(1. + vp->horiz));
538			vp->vert = sin((PI/180./2.)*vp->vert) /
539			(1.0 + cos((PI/180./2.)*vp->vert)) / zf;
540			vp->vert *= vp->vert;
541			vp->vert = (2.180./PI)acos((1. - vp->vert) /
542			(1. + vp->vert));
543			return;
544	greg	2.9	case VT_CYL: /* cylindrical panorama */
545			vp->horiz /= zf;
546			if (vp->horiz > 360.)
547			vp->horiz = 360.;
548			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.);
549	greg	1.17	return;
550			case VT_PER: /* perspective view */
551			vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
552			(PI/180./2.);
553			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
554			(PI/180./2.);
555			return;
556			case VT_HEM: /* hemispherical fisheye */
557			vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
558			if (vp->horiz >= 1.0-FTINY)
559			vp->horiz = 180.;
560			else
561			vp->horiz = asin(vp->horiz) / (PI/180./2.);
562			vp->vert = sin(vp->vert*(PI/180./2.))/zf;
563			if (vp->vert >= 1.0-FTINY)
564			vp->vert = 180.;
565			else
566			vp->vert = asin(vp->vert) / (PI/180./2.);
567			return;
568			}
569	greg	1.1	}