src/rt/rview.c

#ifndef lint
static const char       RCSid[] = "$Id: rview.c,v 2.30 2008/08/22 17:39:26 greg Exp $";
#endif
/*
 *  rview.c - routines and variables for interactive view generation.
 *
 *  External symbols declared in rpaint.h
 */

#include "copyright.h"

#include  <signal.h>
#include  <ctype.h>

#include  "ray.h"
#include  "rpaint.h"

#define  CTRL(c)        ((c)-'@')


void
devopen(                                /* open device driver */
        char  *dname
)
{
        extern char  *progname, *octname;
        char  *id;
        int  i;

        id = octname!=NULL ? octname : progname;
                                                /* check device table */
        for (i = 0; devtable[i].name; i++)
                if (!strcmp(dname, devtable[i].name)) {
                        if ((dev = (*devtable[i].init)(dname, id)) == NULL) {
                                sprintf(errmsg, "cannot initialize %s", dname);
                                error(USER, errmsg);
                        } else
                                return;
                }
                                                /* not there, try exec */
        if ((dev = comm_init(dname, id)) == NULL) {
                sprintf(errmsg, "cannot start device \"%s\"", dname);
                error(USER, errmsg);
        }
}


void
devclose(void)                          /* close our device */
{
        if (dev != NULL)
                (*dev->close)();
        dev = NULL;
}


void
printdevices(void)                      /* print list of output devices */
{
        int  i;

        for (i = 0; devtable[i].name; i++)
                printf("%-16s # %s\n", devtable[i].name, devtable[i].descrip);
}


void
rview(void)                             /* do a view */
{
        char  buf[32];

        devopen(dvcname);               /* open device */
        newimage(NULL);                 /* start image */

        for ( ; ; ) {                   /* quit in command() */
                while (hresolu <= 1<<pdepth && vresolu <= 1<<pdepth)
                        command("done: ");
                errno = 0;
                if (hresolu <= psample<<pdepth && vresolu <= psample<<pdepth) {
                        sprintf(buf, "%d sampling...\n", 1<<pdepth);
                        (*dev->comout)(buf);
                        rsample();
                } else {
                        sprintf(buf, "%d refining...\n", 1<<pdepth);
                        (*dev->comout)(buf);
                        refine(&ptrunk, pdepth+1);
                }
                if (dev->inpready)              /* noticed some input */
                        command(": ");
                else                            /* finished this depth */
                        pdepth++;
        }
}


void
command(                        /* get/execute command */
        char  *prompt
)
{
#define  badcom(s)      strncmp(s, inpbuf, args-inpbuf-1)
        char  inpbuf[256];
        char  *args;
again:
        (*dev->comin)(inpbuf, prompt);          /* get command + arguments */
        for (args = inpbuf; *args && *args != ' '; args++)
                ;
        if (*args) *args++ = '\0';
        else *++args = '\0';

        if (waitrays() < 0)                     /* clear ray queue */
                quit(1);
        
        switch (inpbuf[0]) {
        case 'f':                               /* new frame (|focus|free) */
                if (badcom("frame")) {
                        if (badcom("focus")) {
                                if (badcom("free"))
                                        goto commerr;
                                free_objmem();
                                break;
                        }
                        getfocus(args);
                        break;
                }
                getframe(args);
                break;
        case 'v':                               /* view */
                if (badcom("view"))
                        goto commerr;
                getview(args);
                break;
        case 'l':                               /* last view */
                if (badcom("last"))
                        goto commerr;
                lastview(args);
                break;
        case 'V':                               /* save view */
                if (badcom("V"))
                        goto commerr;
                saveview(args);
                break;
        case 'L':                               /* load view */
                if (badcom("L"))
                        goto commerr;
                loadview(args);
                break;
        case 'e':                               /* exposure */
                if (badcom("exposure"))
                        goto commerr;
                getexposure(args);
                break;
        case 's':                               /* set a parameter */
                if (badcom("set")) {
#ifdef  SIGTSTP
                        if (!badcom("stop"))
                                goto dostop;
#endif
                        goto commerr;
                }
                setparam(args);
                break;
        case 'n':                               /* new picture */
                if (badcom("new"))
                        goto commerr;
                newimage(args);
                break;
        case 't':                               /* trace a ray */
                if (badcom("trace"))
                        goto commerr;
                traceray(args);
                break;
        case 'a':                               /* aim camera */
                if (badcom("aim"))
                        goto commerr;
                getaim(args);
                break;
        case 'm':                               /* move camera (or memstats) */
                if (badcom("move"))
#ifdef  MSTATS
                {
                        if (badcom("memory"))
                                goto commerr;
                        printmemstats(stderr);
                        break;
                }
#else
                        goto commerr;
#endif
                getmove(args);
                break;
        case 'r':                               /* rotate/repaint */
                if (badcom("rotate")) {
                        if (badcom("repaint")) {
                                if (badcom("redraw"))
                                        goto commerr;
                                redraw();
                                break;
                        }
                        getrepaint(args);
                        break;
                }
                getrotate(args);
                break;
        case 'p':                               /* pivot view */
                if (badcom("pivot")) {
                        if (badcom("pause"))
                                goto commerr;
                        goto again;
                }
                getpivot(args);
                break;
        case CTRL('R'):                         /* redraw */
                redraw();
                break;
        case 'w':                               /* write */
                if (badcom("write"))
                        goto commerr;
                writepict(args);
                break;
        case 'q':                               /* quit */
                if (badcom("quit"))
                        goto commerr;
                quit(0);
        case CTRL('C'):                         /* interrupt */
                goto again;
#ifdef  SIGTSTP
        case CTRL('Z'):;                        /* stop */
dostop:
                devclose();
                kill(0, SIGTSTP);
                /* pc stops here */
                devopen(dvcname);
                redraw();
                break;
#endif
        case '\0':                              /* continue */
                break;
        default:;
commerr:
                if (iscntrl(inpbuf[0]))
                        sprintf(errmsg, "^%c: unknown control",
                                        inpbuf[0]|0100);
                else
                        sprintf(errmsg, "%s: unknown command", inpbuf);
                error(COMMAND, errmsg);
                break;
        }
#undef  badcom
}


void
rsample(void)                   /* sample the image */
{
        int  xsiz, ysiz, y;
        PNODE  *p;
        PNODE   **pl;
        int  x;
        /*
         *     We initialize the bottom row in the image at our current
         * resolution.  During sampling, we check super-pixels to the
         * right and above by calling bigdiff().  If there is a significant
         * difference, we subsample the super-pixels.  The testing process
         * includes initialization of the next row.
         */
        xsiz = (((long)(pframe.r-pframe.l)<<pdepth)+hresolu-1) / hresolu;
        ysiz = (((long)(pframe.u-pframe.d)<<pdepth)+vresolu-1) / vresolu;
        pl = (PNODE **)malloc(xsiz*sizeof(PNODE *));
        if (pl == NULL)
                return;
        /*
         * Initialize the bottom row.
         */
        pl[0] = findrect(pframe.l, pframe.d, &ptrunk, pdepth);
        for (x = 1; x < xsiz; x++) {
                pl[x] = findrect(pframe.l+((x*hresolu)>>pdepth),
                                pframe.d, &ptrunk, pdepth);
        }
                                                /* sample the image */
        for (y = 0; /* y < ysiz */ ; y++) {
                for (x = 0; x < xsiz-1; x++) {
                        if (dev->inpready || errno == ENOMEM)
                                goto escape;
                        /*
                         * Test super-pixel to the right.
                         */
                        if (pl[x] != pl[x+1] && bigdiff(pl[x]->v,
                                        pl[x+1]->v, maxdiff)) {
                                refine(pl[x], 1);
                                refine(pl[x+1], 1);
                        }
                }
                if (y >= ysiz-1)
                        break;
                for (x = 0; x < xsiz; x++) {
                        if (dev->inpready || errno == ENOMEM)
                                goto escape;
                        /*
                         * Find super-pixel at this position in next row.
                         */
                        p = findrect(pframe.l+((x*hresolu)>>pdepth),
                                pframe.d+(((y+1)*vresolu)>>pdepth),
                                        &ptrunk, pdepth);
                        /*
                         * Test super-pixel in next row.
                         */
                        if (pl[x] != p && bigdiff(pl[x]->v, p->v, maxdiff)) {
                                refine(pl[x], 1);
                                refine(p, 1);
                        }
                        /*
                         * Copy into super-pixel array.
                         */
                        pl[x] = p;
                }
        }
escape:
        free((void *)pl);
}


int
refine(                         /* refine a node */
        PNODE   *p,
        int  pd
)
{
        int  growth;
        int  mx, my;
        int  i;

        if (dev->inpready)                      /* quit for input */
                return(0);

        if (pd <= 0)                            /* depth limit */
                return(0);

        mx = (p->xmin + p->xmax) >> 1;
        my = (p->ymin + p->ymax) >> 1;
        growth = 0;

        if (p->kid == NULL) {                   /* subdivide */

                if ((p->kid = newptree()) == NULL)
                        return(0);

                p->kid[UR].xmin = mx;
                p->kid[UR].ymin = my;
                p->kid[UR].xmax = p->xmax;
                p->kid[UR].ymax = p->ymax;
                p->kid[UL].xmin = p->xmin;
                p->kid[UL].ymin = my;
                p->kid[UL].xmax = mx;
                p->kid[UL].ymax = p->ymax;
                p->kid[DR].xmin = mx;
                p->kid[DR].ymin = p->ymin;
                p->kid[DR].xmax = p->xmax;
                p->kid[DR].ymax = my;
                p->kid[DL].xmin = p->xmin;
                p->kid[DL].ymin = p->ymin;
                p->kid[DL].xmax = mx;
                p->kid[DL].ymax = my;
                /*
                 *  The following paint order can leave a black pixel
                 *  if redraw() is called in (*dev->paintr)().
                 */
                if (p->x >= mx && p->y >= my)
                        pcopy(p, p->kid+UR);
                else if (paint(p->kid+UR) < 0)
                        quit(1);
                if (p->x < mx && p->y >= my)
                        pcopy(p, p->kid+UL);
                else if (paint(p->kid+UL) < 0)
                        quit(1);
                if (p->x >= mx && p->y < my)
                        pcopy(p, p->kid+DR);
                else if (paint(p->kid+DR) < 0)
                        quit(1);
                if (p->x < mx && p->y < my)
                        pcopy(p, p->kid+DL);
                else if (paint(p->kid+DL) < 0)
                        quit(1);

                growth++;
        }
                                                /* do children */
        if (mx > pframe.l) {
                if (my > pframe.d)
                        growth += refine(p->kid+DL, pd-1);
                if (my < pframe.u)
                        growth += refine(p->kid+UL, pd-1);
        }
        if (mx < pframe.r) {
                if (my > pframe.d)
                        growth += refine(p->kid+DR, pd-1);
                if (my < pframe.u)
                        growth += refine(p->kid+UR, pd-1);
        }
        return(growth);
}
Revision:	2.31
Committed:	Fri Sep 5 19:45:42 2008 UTC (15 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.30:	+1 -8 lines
Log Message:	Fixed bug that broke "exposure" command
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.31	static const char RCSid[] = "$Id: rview.c,v 2.30 2008/08/22 17:39:26 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* rview.c - routines and variables for interactive view generation.
6			*
7	greg	2.18	* External symbols declared in rpaint.h
8			*/
9
10	greg	2.19	#include "copyright.h"
11	greg	1.1
12	schorsch	2.20	#include <signal.h>
13			#include <ctype.h>
14
15	greg	1.15	#include "ray.h"
16	greg	1.1	#include "rpaint.h"
17
18	greg	2.8	#define CTRL(c) ((c)-'@')
19	greg	1.1
20
21	greg	2.18	void
22	greg	2.29	devopen( /* open device driver */
23			char *dname
24			)
25	greg	1.1	{
26	greg	1.6	extern char progname, octname;
27	greg	1.7	char *id;
28	greg	2.29	int i;
29	greg	1.6
30	greg	1.7	id = octname!=NULL ? octname : progname;
31	greg	1.1	/* check device table */
32			for (i = 0; devtable[i].name; i++)
33	schorsch	2.23	if (!strcmp(dname, devtable[i].name)) {
34	greg	1.7	if ((dev = (*devtable[i].init)(dname, id)) == NULL) {
35	greg	1.1	sprintf(errmsg, "cannot initialize %s", dname);
36			error(USER, errmsg);
37			} else
38			return;
39	schorsch	2.23	}
40	greg	1.1	/* not there, try exec */
41	greg	1.7	if ((dev = comm_init(dname, id)) == NULL) {
42	greg	1.1	sprintf(errmsg, "cannot start device \"%s\"", dname);
43			error(USER, errmsg);
44			}
45			}
46
47
48	greg	2.18	void
49	greg	2.29	devclose(void) /* close our device */
50	greg	1.1	{
51			if (dev != NULL)
52			(*dev->close)();
53			dev = NULL;
54			}
55
56
57	greg	2.18	void
58	greg	2.29	printdevices(void) /* print list of output devices */
59	greg	1.1	{
60	greg	2.29	int i;
61	greg	1.1
62			for (i = 0; devtable[i].name; i++)
63			printf("%-16s # %s\n", devtable[i].name, devtable[i].descrip);
64			}
65
66
67	greg	2.18	void
68	greg	2.29	rview(void) /* do a view */
69	greg	1.1	{
70			char buf[32];
71
72	greg	2.18	devopen(dvcname); /* open device */
73	greg	2.29	newimage(NULL); /* start image */
74	greg	1.14
75	greg	1.1	for ( ; ; ) { /* quit in command() */
76	greg	1.14	while (hresolu <= 1<<pdepth && vresolu <= 1<<pdepth)
77	greg	1.1	command("done: ");
78	greg	1.14	errno = 0;
79			if (hresolu <= psample<<pdepth && vresolu <= psample<<pdepth) {
80	greg	1.1	sprintf(buf, "%d sampling...\n", 1<<pdepth);
81			(*dev->comout)(buf);
82			rsample();
83			} else {
84			sprintf(buf, "%d refining...\n", 1<<pdepth);
85			(*dev->comout)(buf);
86	greg	2.29	refine(&ptrunk, pdepth+1);
87	greg	1.1	}
88	greg	2.29	if (dev->inpready) /* noticed some input */
89	greg	1.1	command(": ");
90	greg	1.14	else /* finished this depth */
91	greg	1.1	pdepth++;
92			}
93			}
94
95
96	greg	2.18	void
97	greg	2.29	command( /* get/execute command */
98			char *prompt
99			)
100	greg	1.1	{
101	greg	2.8	#define badcom(s) strncmp(s, inpbuf, args-inpbuf-1)
102	greg	1.1	char inpbuf[256];
103			char *args;
104			again:
105	greg	1.10	(dev->comin)(inpbuf, prompt); / get command + arguments */
106	greg	1.1	for (args = inpbuf; args && args != ' '; args++)
107			;
108			if (args) args++ = '\0';
109			else *++args = '\0';
110	greg	2.30
111			if (waitrays() < 0) /* clear ray queue */
112			quit(1);
113	greg	1.1
114			switch (inpbuf[0]) {
115	greg	2.27	case 'f': /* new frame (\|focus\|free) */
116	greg	2.10	if (badcom("frame")) {
117	greg	2.27	if (badcom("focus")) {
118			if (badcom("free"))
119			goto commerr;
120			free_objmem();
121			break;
122			}
123			getfocus(args);
124	greg	2.10	break;
125			}
126	greg	1.1	getframe(args);
127			break;
128			case 'v': /* view */
129			if (badcom("view"))
130			goto commerr;
131			getview(args);
132			break;
133			case 'l': /* last view */
134			if (badcom("last"))
135			goto commerr;
136			lastview(args);
137	greg	2.11	break;
138			case 'V': /* save view */
139			if (badcom("V"))
140			goto commerr;
141			saveview(args);
142			break;
143			case 'L': /* load view */
144			if (badcom("L"))
145			goto commerr;
146			loadview(args);
147	greg	1.1	break;
148			case 'e': /* exposure */
149			if (badcom("exposure"))
150			goto commerr;
151			getexposure(args);
152			break;
153			case 's': /* set a parameter */
154	greg	2.13	if (badcom("set")) {
155			#ifdef SIGTSTP
156			if (!badcom("stop"))
157			goto dostop;
158			#endif
159	greg	1.1	goto commerr;
160	greg	2.13	}
161	greg	1.1	setparam(args);
162			break;
163			case 'n': /* new picture */
164			if (badcom("new"))
165			goto commerr;
166	greg	2.29	newimage(args);
167	greg	1.1	break;
168			case 't': /* trace a ray */
169			if (badcom("trace"))
170			goto commerr;
171			traceray(args);
172			break;
173			case 'a': /* aim camera */
174			if (badcom("aim"))
175			goto commerr;
176			getaim(args);
177			break;
178	greg	2.10	case 'm': /* move camera (or memstats) */
179	greg	1.1	if (badcom("move"))
180	greg	2.8	#ifdef MSTATS
181	greg	2.2	{
182			if (badcom("memory"))
183			goto commerr;
184			printmemstats(stderr);
185			break;
186			}
187			#else
188	greg	1.1	goto commerr;
189	greg	2.2	#endif
190	greg	1.1	getmove(args);
191			break;
192	greg	1.8	case 'r': /* rotate/repaint */
193			if (badcom("rotate")) {
194	greg	2.13	if (badcom("repaint")) {
195			if (badcom("redraw"))
196			goto commerr;
197			redraw();
198			break;
199			}
200	greg	1.8	getrepaint(args);
201			break;
202			}
203	greg	1.1	getrotate(args);
204			break;
205			case 'p': /* pivot view */
206	greg	2.13	if (badcom("pivot")) {
207			if (badcom("pause"))
208			goto commerr;
209			goto again;
210			}
211	greg	1.1	getpivot(args);
212			break;
213	greg	2.4	case CTRL('R'): /* redraw */
214	greg	1.1	redraw();
215			break;
216			case 'w': /* write */
217			if (badcom("write"))
218			goto commerr;
219			writepict(args);
220			break;
221			case 'q': /* quit */
222			if (badcom("quit"))
223			goto commerr;
224			quit(0);
225	greg	2.4	case CTRL('C'): /* interrupt */
226	greg	1.1	goto again;
227	greg	2.8	#ifdef SIGTSTP
228	greg	2.13	case CTRL('Z'):; /* stop */
229			dostop:
230	greg	1.1	devclose();
231			kill(0, SIGTSTP);
232			/* pc stops here */
233	greg	2.18	devopen(dvcname);
234	greg	1.1	redraw();
235			break;
236			#endif
237			case '\0': /* continue */
238			break;
239			default:;
240			commerr:
241			if (iscntrl(inpbuf[0]))
242			sprintf(errmsg, "^%c: unknown control",
243			inpbuf[0]\|0100);
244			else
245			sprintf(errmsg, "%s: unknown command", inpbuf);
246			error(COMMAND, errmsg);
247			break;
248			}
249	greg	2.8	#undef badcom
250	greg	1.1	}
251
252
253	greg	2.18	void
254	greg	2.29	rsample(void) /* sample the image */
255	greg	1.1	{
256			int xsiz, ysiz, y;
257			PNODE *p;
258	greg	2.29	PNODE **pl;
259			int x;
260	greg	1.1	/*
261			* We initialize the bottom row in the image at our current
262	greg	2.8	* resolution. During sampling, we check super-pixels to the
263	greg	1.1	* right and above by calling bigdiff(). If there is a significant
264			* difference, we subsample the super-pixels. The testing process
265			* includes initialization of the next row.
266			*/
267	greg	2.12	xsiz = (((long)(pframe.r-pframe.l)<<pdepth)+hresolu-1) / hresolu;
268			ysiz = (((long)(pframe.u-pframe.d)<<pdepth)+vresolu-1) / vresolu;
269	greg	1.1	pl = (PNODE *)malloc(xsizsizeof(PNODE *));
270	greg	2.29	if (pl == NULL)
271	greg	1.14	return;
272	greg	1.1	/*
273			* Initialize the bottom row.
274			*/
275	greg	2.29	pl[0] = findrect(pframe.l, pframe.d, &ptrunk, pdepth);
276	greg	1.1	for (x = 1; x < xsiz; x++) {
277	greg	1.9	pl[x] = findrect(pframe.l+((x*hresolu)>>pdepth),
278	greg	2.29	pframe.d, &ptrunk, pdepth);
279	greg	1.1	}
280			/* sample the image */
281			for (y = 0; /* y < ysiz */ ; y++) {
282			for (x = 0; x < xsiz-1; x++) {
283	greg	1.20	if (dev->inpready \|\| errno == ENOMEM)
284	greg	1.1	goto escape;
285			/*
286			* Test super-pixel to the right.
287			*/
288			if (pl[x] != pl[x+1] && bigdiff(pl[x]->v,
289			pl[x+1]->v, maxdiff)) {
290	greg	2.29	refine(pl[x], 1);
291			refine(pl[x+1], 1);
292	greg	1.1	}
293			}
294			if (y >= ysiz-1)
295			break;
296			for (x = 0; x < xsiz; x++) {
297	greg	1.20	if (dev->inpready \|\| errno == ENOMEM)
298	greg	1.1	goto escape;
299			/*
300			* Find super-pixel at this position in next row.
301			*/
302	greg	1.9	p = findrect(pframe.l+((x*hresolu)>>pdepth),
303			pframe.d+(((y+1)*vresolu)>>pdepth),
304	greg	2.29	&ptrunk, pdepth);
305	greg	1.1	/*
306			* Test super-pixel in next row.
307			*/
308			if (pl[x] != p && bigdiff(pl[x]->v, p->v, maxdiff)) {
309	greg	2.29	refine(pl[x], 1);
310			refine(p, 1);
311	greg	1.1	}
312			/*
313			* Copy into super-pixel array.
314			*/
315			pl[x] = p;
316			}
317			}
318			escape:
319	greg	2.18	free((void *)pl);
320	greg	1.1	}
321
322
323			int
324	greg	2.29	refine( /* refine a node */
325			PNODE *p,
326			int pd
327			)
328	greg	1.1	{
329			int growth;
330			int mx, my;
331			int i;
332
333			if (dev->inpready) /* quit for input */
334			return(0);
335
336			if (pd <= 0) /* depth limit */
337			return(0);
338
339	greg	2.29	mx = (p->xmin + p->xmax) >> 1;
340			my = (p->ymin + p->ymax) >> 1;
341	greg	1.1	growth = 0;
342
343			if (p->kid == NULL) { /* subdivide */
344
345			if ((p->kid = newptree()) == NULL)
346	greg	1.20	return(0);
347	greg	2.29
348			p->kid[UR].xmin = mx;
349			p->kid[UR].ymin = my;
350			p->kid[UR].xmax = p->xmax;
351			p->kid[UR].ymax = p->ymax;
352			p->kid[UL].xmin = p->xmin;
353			p->kid[UL].ymin = my;
354			p->kid[UL].xmax = mx;
355			p->kid[UL].ymax = p->ymax;
356			p->kid[DR].xmin = mx;
357			p->kid[DR].ymin = p->ymin;
358			p->kid[DR].xmax = p->xmax;
359			p->kid[DR].ymax = my;
360			p->kid[DL].xmin = p->xmin;
361			p->kid[DL].ymin = p->ymin;
362			p->kid[DL].xmax = mx;
363			p->kid[DL].ymax = my;
364	greg	1.1	/*
365			* The following paint order can leave a black pixel
366	greg	2.7	* if redraw() is called in (*dev->paintr)().
367	greg	1.1	*/
368			if (p->x >= mx && p->y >= my)
369			pcopy(p, p->kid+UR);
370	greg	2.29	else if (paint(p->kid+UR) < 0)
371			quit(1);
372	greg	1.1	if (p->x < mx && p->y >= my)
373			pcopy(p, p->kid+UL);
374	greg	2.29	else if (paint(p->kid+UL) < 0)
375			quit(1);
376	greg	1.1	if (p->x >= mx && p->y < my)
377			pcopy(p, p->kid+DR);
378	greg	2.29	else if (paint(p->kid+DR) < 0)
379			quit(1);
380	greg	1.1	if (p->x < mx && p->y < my)
381			pcopy(p, p->kid+DL);
382	greg	2.29	else if (paint(p->kid+DL) < 0)
383			quit(1);
384	greg	1.1
385			growth++;
386			}
387			/* do children */
388			if (mx > pframe.l) {
389			if (my > pframe.d)
390	greg	2.29	growth += refine(p->kid+DL, pd-1);
391	greg	1.1	if (my < pframe.u)
392	greg	2.29	growth += refine(p->kid+UL, pd-1);
393	greg	1.1	}
394			if (mx < pframe.r) {
395			if (my > pframe.d)
396	greg	2.29	growth += refine(p->kid+DR, pd-1);
397	greg	1.1	if (my < pframe.u)
398	greg	2.29	growth += refine(p->kid+UR, pd-1);
399	greg	1.1	}
400			return(growth);
401			}