src/rt/rv3.c

#ifndef lint
static const char       RCSid[] = "$Id: rv3.c,v 2.27 2008/09/05 19:45:41 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);
}

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
)
{
        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);

        recolor(p);                             /* paint it */

        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);
                recolor(p);
                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
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:	2.28
Committed:	Fri Sep 5 21:34:09 2008 UTC (15 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.27:	+14 -10 lines
Log Message:	Really fixed the exposure bug this time
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.28	static const char RCSid[] = "$Id: rv3.c,v 2.27 2008/09/05 19:45:41 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	greg	2.26	static void
150			recolor( /* recolor the given node */
151			PNODE *p
152			)
153			{
154			while (p->kid != NULL) { /* need to propogate down */
155			int mx = (p->xmin + p->xmax) >> 1;
156			int my = (p->ymin + p->ymax) >> 1;
157			int ki;
158			if (p->x >= mx)
159			ki = (p->y >= my) ? UR : DR;
160			else
161			ki = (p->y >= my) ? UL : DL;
162			pcopy(p, p->kid+ki);
163			p = p->kid + ki;
164			}
165
166			(*dev->paintr)(greyscale?greyof(p->v):p->v,
167			p->xmin, p->ymin, p->xmax, p->ymax);
168			}
169	greg	1.1
170	greg	2.22	int
171			paint( /* compute and paint a rectangle */
172			PNODE *p
173			)
174	greg	1.1	{
175	greg	2.22	extern int ray_pnprocs;
176	greg	2.5	static unsigned long lastflush = 0;
177	greg	1.1	static RAY thisray;
178	greg	2.24	int flushintvl;
179	greg	1.1	double h, v;
180
181	greg	2.22	if (p->xmax - p->xmin <= 0 \|\| p->ymax - p->ymin <= 0) { /* empty */
182			p->x = p->xmin;
183			p->y = p->ymin;
184	greg	1.1	setcolor(p->v, 0.0, 0.0, 0.0);
185	greg	2.22	return(0);
186	greg	1.1	}
187			/* jitter ray direction */
188	greg	2.22	p->x = h = p->xmin + (p->xmax-p->xmin)*frandom();
189			p->y = v = p->ymin + (p->ymax-p->ymin)*frandom();
190	greg	1.1
191	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
192			h/hresolu, v/vresolu)) < -FTINY) {
193	greg	1.17	setcolor(thisray.rcol, 0.0, 0.0, 0.0);
194			} else {
195	greg	2.22	int rval;
196	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
197	greg	2.22	thisray.rno = (unsigned long)p;
198			rval = ray_pqueue(&thisray);
199			if (!rval)
200			return(0);
201			if (rval < 0)
202			return(-1);
203			p = (PNODE *)thisray.rno;
204	greg	1.17	}
205	greg	1.1
206			copycolor(p->v, thisray.rcol);
207			scalecolor(p->v, exposure);
208
209	greg	2.26	recolor(p); /* paint it */
210	greg	1.13
211	greg	2.24	if (ambounce <= 0) /* shall we check for input? */
212			flushintvl = ray_pnprocs*WFLUSH;
213			else if (niflush < WFLUSH)
214			flushintvl = ray_pnprocs*niflush/(ambounce+1);
215			else
216			flushintvl = ray_pnprocs*WFLUSH/(ambounce+1);
217
218			if (dev->flush != NULL && raynum - lastflush >= flushintvl) {
219	greg	2.22	lastflush = raynum;
220	greg	1.13	(*dev->flush)();
221	greg	2.23	niflush++;
222	greg	1.13	}
223	greg	2.22	return(1);
224			}
225
226
227			int
228	greg	2.24	waitrays(void) /* finish up pending rays */
229	greg	2.22	{
230			int nwaited = 0;
231			int rval;
232			RAY raydone;
233
234			while ((rval = ray_presult(&raydone, 0)) > 0) {
235			PNODE p = (PNODE )raydone.rno;
236			copycolor(p->v, raydone.rcol);
237			scalecolor(p->v, exposure);
238	greg	2.26	recolor(p);
239	greg	2.22	nwaited++;
240			}
241			if (rval < 0)
242			return(-1);
243			return(nwaited);
244	greg	1.1	}
245
246
247	greg	2.10	void
248	greg	2.22	newimage( /* start a new image */
249			char *s
250			)
251	greg	1.1	{
252	greg	2.22	int newnp;
253			/* change in nproc? */
254			if (s != NULL && sscanf(s, "%d", &newnp) == 1 && newnp > 0) {
255			if (!newparam) {
256			if (newnp < nproc)
257			ray_pclose(nproc - newnp);
258			else
259			ray_popen(newnp - nproc);
260			}
261			nproc = newnp;
262			}
263	greg	1.1	/* free old image */
264			freepkids(&ptrunk);
265	greg	1.9	/* compute resolution */
266	greg	1.10	hresolu = dev->xsiz;
267			vresolu = dev->ysiz;
268	greg	1.11	normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
269	greg	2.22	ptrunk.xmin = ptrunk.ymin = pframe.l = pframe.d = 0;
270			ptrunk.xmax = pframe.r = hresolu;
271			ptrunk.ymax = pframe.u = vresolu;
272	greg	1.1	pdepth = 0;
273			/* clear device */
274	greg	1.9	(*dev->clear)(hresolu, vresolu);
275	greg	2.22
276			if (newparam) { /* (re)start rendering procs */
277			ray_pclose(0);
278			ray_popen(nproc);
279			newparam = 0;
280			}
281	greg	2.23	niflush = 0; /* get first value */
282	greg	2.22	paint(&ptrunk);
283	greg	1.1	}
284
285
286	greg	2.10	void
287	greg	2.22	redraw(void) /* redraw the image */
288	greg	1.1	{
289	greg	1.9	(*dev->clear)(hresolu, vresolu);
290	greg	1.1	(*dev->comout)("redrawing...\n");
291	greg	1.9	repaint(0, 0, hresolu, vresolu);
292	greg	1.1	(*dev->comout)("\n");
293			}
294
295
296	greg	2.10	void
297	greg	2.22	repaint( /* repaint a region */
298			int xmin,
299			int ymin,
300			int xmax,
301			int ymax
302			)
303	greg	1.1	{
304			RECT reg;
305
306			reg.l = xmin; reg.r = xmax;
307			reg.d = ymin; reg.u = ymax;
308
309	greg	2.22	paintrect(&ptrunk, &reg);
310	greg	1.1	}
311
312
313	greg	2.10	void
314	greg	2.22	paintrect( /* paint picture rectangle */
315			PNODE *p,
316			RECT *r
317			)
318	greg	1.1	{
319			int mx, my;
320
321	greg	2.22	if (p->xmax - p->xmin <= 0 \|\| p->ymax - p->ymin <= 0)
322	greg	1.1	return;
323
324			if (p->kid == NULL) {
325			(*dev->paintr)(greyscale?greyof(p->v):p->v,
326	greg	2.22	p->xmin, p->ymin, p->xmax, p->ymax); /* do this */
327	greg	1.1	return;
328			}
329	greg	2.22	mx = (p->xmin + p->xmax) >> 1; /* do kids */
330			my = (p->ymin + p->ymax) >> 1;
331	greg	1.1	if (mx > r->l) {
332			if (my > r->d)
333	greg	2.22	paintrect(p->kid+DL, r);
334	greg	1.1	if (my < r->u)
335	greg	2.22	paintrect(p->kid+UL, r);
336	greg	1.1	}
337			if (mx < r->r) {
338			if (my > r->d)
339	greg	2.22	paintrect(p->kid+DR, r);
340	greg	1.1	if (my < r->u)
341	greg	2.22	paintrect(p->kid+UR, r);
342	greg	1.1	}
343			}
344
345
346			PNODE *
347	greg	2.22	findrect( /* find a rectangle */
348			int x,
349			int y,
350			PNODE *p,
351			int pd
352			)
353	greg	1.1	{
354			int mx, my;
355
356			while (p->kid != NULL && pd--) {
357
358	greg	2.22	mx = (p->xmin + p->xmax) >> 1;
359			my = (p->ymin + p->ymax) >> 1;
360	greg	1.1
361			if (x < mx) {
362			if (y < my) {
363			p = p->kid+DL;
364			} else {
365			p = p->kid+UL;
366			}
367			} else {
368			if (y < my) {
369			p = p->kid+DR;
370			} else {
371			p = p->kid+UR;
372			}
373			}
374			}
375			return(p);
376			}
377
378
379	greg	2.10	void
380	greg	2.27	compavg( /* recompute averages */
381			PNODE *p
382			)
383			{
384	greg	2.28	int i, navg;
385
386	greg	2.27	if (p->kid == NULL)
387			return;
388	greg	2.28
389	greg	2.27	setcolor(p->v, .0, .0, .0);
390	greg	2.28	navg = 0;
391			for (i = 0; i < 4; i++) {
392			if (p->kid[i].xmin >= p->kid[i].xmax) continue;
393			if (p->kid[i].ymin >= p->kid[i].ymax) continue;
394			compavg(p->kid+i);
395			addcolor(p->v, p->kid[i].v);
396			navg++;
397			}
398			if (navg > 1)
399			scalecolor(p->v, 1./navg);
400	greg	2.27	}
401
402
403			void
404	greg	2.22	scalepict( /* scale picture values */
405			PNODE *p,
406			double sf
407			)
408	greg	1.1	{
409			scalecolor(p->v, sf); /* do this node */
410
411			if (p->kid == NULL)
412			return;
413			/* do children */
414			scalepict(p->kid+DL, sf);
415			scalepict(p->kid+DR, sf);
416			scalepict(p->kid+UL, sf);
417			scalepict(p->kid+UR, sf);
418			}
419
420
421	greg	2.10	void
422	greg	2.22	getpictcolrs( /* get scanline from picture */
423			int yoff,
424			COLR *scan,
425			PNODE *p,
426			int xsiz,
427			int ysiz
428			)
429	greg	1.1	{
430	greg	2.22	int mx;
431	greg	1.1	int my;
432
433			if (p->kid == NULL) { /* do this node */
434			setcolr(scan[0], colval(p->v,RED),
435			colval(p->v,GRN),
436			colval(p->v,BLU));
437			for (mx = 1; mx < xsiz; mx++)
438			copycolr(scan[mx], scan[0]);
439			return;
440			}
441			/* do kids */
442			mx = xsiz >> 1;
443			my = ysiz >> 1;
444			if (yoff < my) {
445			getpictcolrs(yoff, scan, p->kid+DL, mx, my);
446			getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
447			} else {
448			getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
449			getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
450			}
451			}
452
453
454	greg	2.10	void
455	greg	2.22	freepkids( /* free pnode's children */
456			PNODE *p
457			)
458	greg	1.1	{
459			if (p->kid == NULL)
460			return;
461			freepkids(p->kid+DL);
462			freepkids(p->kid+DR);
463			freepkids(p->kid+UL);
464			freepkids(p->kid+UR);
465	greg	2.10	free((void *)p->kid);
466	greg	1.1	p->kid = NULL;
467			}
468
469
470	greg	2.10	void
471	greg	2.22	newview( /* change viewing parameters */
472			VIEW *vp
473			)
474	greg	1.1	{
475			char *err;
476
477	greg	1.6	if ((err = setview(vp)) != NULL) {
478	greg	1.1	sprintf(errmsg, "view not set - %s", err);
479			error(COMMAND, errmsg);
480	schorsch	2.12	} else if (memcmp((char )vp, (char )&ourview, sizeof(VIEW))) {
481	schorsch	2.13	oldview = ourview;
482			ourview = *vp;
483	greg	2.22	newimage(NULL);
484	greg	1.1	}
485			}
486
487
488	greg	2.10	void
489	greg	2.22	moveview( /* move viewpoint */
490			double angle,
491			double elev,
492			double mag,
493			FVECT vc
494			)
495	greg	1.1	{
496			double d;
497	greg	1.4	FVECT v1;
498	greg	2.14	VIEW nv = ourview;
499	greg	2.22	int i;
500	greg	1.1
501			spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
502	greg	1.4	if (elev != 0.0) {
503	greg	1.5	fcross(v1, ourview.vup, nv.vdir);
504	greg	1.4	normalize(v1);
505			spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
506			}
507	greg	2.15	if (nv.type == VT_PAR) {
508			nv.horiz /= mag;
509			nv.vert /= mag;
510	greg	1.3	d = 0.0; /* don't move closer */
511	greg	1.2	for (i = 0; i < 3; i++)
512	greg	1.3	d += (vc[i] - ourview.vp[i])*ourview.vdir[i];
513	greg	1.1	} else {
514	greg	1.2	d = sqrt(dist2(ourview.vp, vc)) / mag;
515	greg	2.15	if (nv.vfore > FTINY) {
516	greg	2.8	nv.vfore += d - d*mag;
517			if (nv.vfore < 0.0) nv.vfore = 0.0;
518			}
519	greg	2.15	if (nv.vaft > FTINY) {
520	greg	2.8	nv.vaft += d - d*mag;
521			if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
522			}
523	greg	2.16	nv.vdist /= mag;
524	greg	1.1	}
525	greg	1.2	for (i = 0; i < 3; i++)
526			nv.vp[i] = vc[i] - d*nv.vdir[i];
527	greg	1.1	newview(&nv);
528	greg	1.17	}
529
530
531	greg	2.10	void
532	greg	2.22	pcopy( /* copy paint node p1 into p2 */
533			PNODE *p1,
534			PNODE *p2
535			)
536	greg	2.10	{
537			copycolor(p2->v, p1->v);
538			p2->x = p1->x;
539			p2->y = p1->y;
540			}
541
542
543			void
544	greg	2.22	zoomview( /* zoom in or out */
545			VIEW *vp,
546			double zf
547			)
548	greg	1.17	{
549			switch (vp->type) {
550			case VT_PAR: /* parallel view */
551	greg	2.9	vp->horiz /= zf;
552			vp->vert /= zf;
553			return;
554	greg	1.17	case VT_ANG: /* angular fisheye */
555			vp->horiz /= zf;
556	greg	2.9	if (vp->horiz > 360.)
557			vp->horiz = 360.;
558	greg	1.17	vp->vert /= zf;
559	greg	2.9	if (vp->vert > 360.)
560			vp->vert = 360.;
561			return;
562	greg	2.21	case VT_PLS: /* planisphere fisheye */
563			vp->horiz = sin((PI/180./2.)*vp->horiz) /
564			(1.0 + cos((PI/180./2.)*vp->horiz)) / zf;
565			vp->horiz *= vp->horiz;
566			vp->horiz = (2.180./PI)acos((1. - vp->horiz) /
567			(1. + vp->horiz));
568			vp->vert = sin((PI/180./2.)*vp->vert) /
569			(1.0 + cos((PI/180./2.)*vp->vert)) / zf;
570			vp->vert *= vp->vert;
571			vp->vert = (2.180./PI)acos((1. - vp->vert) /
572			(1. + vp->vert));
573			return;
574	greg	2.9	case VT_CYL: /* cylindrical panorama */
575			vp->horiz /= zf;
576			if (vp->horiz > 360.)
577			vp->horiz = 360.;
578			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.);
579	greg	1.17	return;
580			case VT_PER: /* perspective view */
581			vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
582			(PI/180./2.);
583			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
584			(PI/180./2.);
585			return;
586			case VT_HEM: /* hemispherical fisheye */
587			vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
588			if (vp->horiz >= 1.0-FTINY)
589			vp->horiz = 180.;
590			else
591			vp->horiz = asin(vp->horiz) / (PI/180./2.);
592			vp->vert = sin(vp->vert*(PI/180./2.))/zf;
593			if (vp->vert >= 1.0-FTINY)
594			vp->vert = 180.;
595			else
596			vp->vert = asin(vp->vert) / (PI/180./2.);
597			return;
598			}
599	greg	1.1	}