src/rt/rview.c

#ifndef lint
static const char       RCSid[] = "$Id: rview.c,v 2.26 2004/11/05 17:36:56 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"


CUBE  thescene;                         /* our scene */
OBJECT  nsceneobjs;                     /* number of objects in our scene */

int  dimlist[MAXDIM];                   /* sampling dimensions */
int  ndims = 0;                         /* number of sampling dimensions */
int  samplendx = 0;                     /* index for this sample */

extern void  ambnotify();
void  (*addobjnotify[])() = {ambnotify, NULL};

VIEW  ourview = STDVIEW;                /* viewing parameters */
int  hresolu, vresolu;                  /* image resolution */

void  (*trace)() = NULL;                /* trace call */

int  do_irrad = 0;                      /* compute irradiance? */

int  psample = 8;                       /* pixel sample size */
double  maxdiff = .15;                  /* max. sample difference */

double  exposure = 1.0;                 /* exposure for scene */

double  dstrsrc = 0.0;                  /* square source distribution */
double  shadthresh = .1;                /* shadow threshold */
double  shadcert = .25;                 /* shadow certainty */
int  directrelay = 0;                   /* number of source relays */
int  vspretest = 128;                   /* virtual source pretest density */
int  directvis = 1;                     /* sources visible? */
double  srcsizerat = 0.;                /* maximum ratio source size/dist. */

COLOR  cextinction = BLKCOLOR;          /* global extinction coefficient */
COLOR  salbedo = BLKCOLOR;              /* global scattering albedo */
double  seccg = 0.;                     /* global scattering eccentricity */
double  ssampdist = 0.;                 /* scatter sampling distance */

double  specthresh = .3;                /* specular sampling threshold */
double  specjitter = 1.;                /* specular sampling jitter */

int  backvis = 1;                       /* back face visibility */

int  maxdepth = 6;                      /* maximum recursion depth */
double  minweight = 1e-2;               /* minimum ray weight */

char  *ambfile = NULL;                  /* ambient file name */
COLOR  ambval = BLKCOLOR;               /* ambient value */
int  ambvwt = 0;                        /* initial weight for ambient value */
double  ambacc = 0.3;                   /* ambient accuracy */
int  ambres = 32;                       /* ambient resolution */
int  ambdiv = 256;                      /* ambient divisions */
int  ambssamp = 64;                     /* ambient super-samples */
int  ambounce = 0;                      /* ambient bounces */
char  *amblist[AMBLLEN];                /* ambient include/exclude list */
int  ambincl = -1;                      /* include == 1, exclude == 0 */

int  greyscale = 0;                     /* map colors to brightness? */
char  *dvcname = dev_default;           /* output device name */

struct driver  *dev = NULL;             /* driver functions */

char  rifname[128];                     /* rad input file name */

VIEW  oldview;                          /* previous view parameters */

PNODE  ptrunk;                          /* the base of our image */
RECT  pframe;                           /* current frame boundaries */
int  pdepth;                            /* image depth in current frame */

static char  *reserve_mem = NULL;       /* pre-allocated reserve memory */

#define RESERVE_AMT     32768           /* amount of memory to reserve */

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


void
quit(code)                      /* quit program */
int  code;
{
#ifdef MSTATS
        if (code == 2 && errno == ENOMEM)
                printmemstats(stderr);
#endif
        devclose();
        exit(code);
}


void
devopen(dname)                          /* open device driver */
char  *dname;
{
        extern char  *progname, *octname;
        char  *id;
        register 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()                              /* close our device */
{
        if (dev != NULL)
                (*dev->close)();
        dev = NULL;
}


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

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


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

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

        for ( ; ; ) {                   /* quit in command() */
                while (hresolu <= 1<<pdepth && vresolu <= 1<<pdepth)
                        command("done: ");
                while (reserve_mem == NULL)
                        command("out of memory: ");
                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, 0, 0, hresolu, vresolu, pdepth+1);
                }
                if (errno == ENOMEM)            /* ran out of memory */
                        freereserves();
                else if (dev->inpready)         /* noticed some input */
                        command(": ");
                else                            /* finished this depth */
                        pdepth++;
        }
}


void
fillreserves()                  /* fill memory reserves */
{
        if (reserve_mem != NULL)
                return;
        reserve_mem = (char *)malloc(RESERVE_AMT);
}


void
freereserves()                  /* free memory reserves */
{
        if (reserve_mem == NULL)
                return;
        free(reserve_mem);
        reserve_mem = NULL;
}


void
command(prompt)                 /* 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';
        
        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();
                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()                       /* sample the image */
{
        int  xsiz, ysiz, y;
        RECT  r;
        PNODE  *p;
        register RECT  *rl;
        register PNODE  **pl;
        register 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;
        rl = (RECT *)malloc(xsiz*sizeof(RECT));
        if (rl == NULL)
                return;
        pl = (PNODE **)malloc(xsiz*sizeof(PNODE *));
        if (pl == NULL) {
                free((void *)rl);
                return;
        }
        /*
         * Initialize the bottom row.
         */
        rl[0].l = rl[0].d = 0;
        rl[0].r = hresolu; rl[0].u = vresolu;
        pl[0] = findrect(pframe.l, pframe.d, &ptrunk, rl, pdepth);
        for (x = 1; x < xsiz; x++) {
                rl[x].l = rl[x].d = 0;
                rl[x].r = hresolu; rl[x].u = vresolu;
                pl[x] = findrect(pframe.l+((x*hresolu)>>pdepth),
                                pframe.d, &ptrunk, rl+x, 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], rl[x].l, rl[x].d,
                                                rl[x].r, rl[x].u, 1);
                                refine(pl[x+1], rl[x+1].l, rl[x+1].d,
                                                rl[x+1].r, rl[x+1].u, 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.
                         */
                        r.l = r.d = 0;
                        r.r = hresolu; r.u = vresolu;
                        p = findrect(pframe.l+((x*hresolu)>>pdepth),
                                pframe.d+(((y+1)*vresolu)>>pdepth),
                                        &ptrunk, &r, pdepth);
                        /*
                         * Test super-pixel in next row.
                         */
                        if (pl[x] != p && bigdiff(pl[x]->v, p->v, maxdiff)) {
                                refine(pl[x], rl[x].l, rl[x].d,
                                                rl[x].r, rl[x].u, 1);
                                refine(p, r.l, r.d, r.r, r.u, 1);
                        }
                        /*
                         * Copy into super-pixel array.
                         */
                        rl[x].l = r.l; rl[x].d = r.d;
                        rl[x].r = r.r; rl[x].u = r.u;
                        pl[x] = p;
                }
        }
escape:
        free((void *)rl);
        free((void *)pl);
}


int
refine(p, xmin, ymin, xmax, ymax, pd)           /* refine a node */
register PNODE  *p;
int  xmin, ymin, xmax, ymax;
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 = (xmin + xmax) >> 1;
        my = (ymin + ymax) >> 1;
        growth = 0;

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

                if ((p->kid = newptree()) == NULL)
                        return(0);
                /*
                 *  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
                        paint(p->kid+UR, mx, my, xmax, ymax);
                if (p->x < mx && p->y >= my)
                        pcopy(p, p->kid+UL);
                else
                        paint(p->kid+UL, xmin, my, mx, ymax);
                if (p->x >= mx && p->y < my)
                        pcopy(p, p->kid+DR);
                else
                        paint(p->kid+DR, mx, ymin, xmax, my);
                if (p->x < mx && p->y < my)
                        pcopy(p, p->kid+DL);
                else
                        paint(p->kid+DL, xmin, ymin, mx, my);

                growth++;
        }
                                                /* do children */
        if (mx > pframe.l) {
                if (my > pframe.d)
                        growth += refine(p->kid+DL, xmin, ymin, mx, my, pd-1);
                if (my < pframe.u)
                        growth += refine(p->kid+UL, xmin, my, mx, ymax, pd-1);
        }
        if (mx < pframe.r) {
                if (my > pframe.d)
                        growth += refine(p->kid+DR, mx, ymin, xmax, my, pd-1);
                if (my < pframe.u)
                        growth += refine(p->kid+UR, mx, my, xmax, ymax, pd-1);
        }
                                                /* recompute sum */
        if (growth) {
                setcolor(p->v, 0.0, 0.0, 0.0);
                for (i = 0; i < 4; i++)
                        addcolor(p->v, p->kid[i].v);
                scalecolor(p->v, 0.25);
        }
        return(growth);
}
Revision:	2.27
Committed:	Fri Jan 21 00:52:59 2005 UTC (19 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.26:	+9 -5 lines
Log Message:	Fixed bug in rvu "move" command from last change and added "focus" command
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.27	static const char RCSid[] = "$Id: rview.c,v 2.26 2004/11/05 17:36:56 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
19	greg	2.18	CUBE thescene; /* our scene */
20			OBJECT nsceneobjs; /* number of objects in our scene */
21	greg	1.15
22			int dimlist[MAXDIM]; /* sampling dimensions */
23			int ndims = 0; /* number of sampling dimensions */
24			int samplendx = 0; /* index for this sample */
25	greg	1.1
26	greg	2.18	extern void ambnotify();
27			void (*addobjnotify[])() = {ambnotify, NULL};
28
29			VIEW ourview = STDVIEW; /* viewing parameters */
30			int hresolu, vresolu; /* image resolution */
31
32			void (trace)() = NULL; / trace call */
33
34			int do_irrad = 0; /* compute irradiance? */
35
36	greg	1.1	int psample = 8; /* pixel sample size */
37	greg	2.8	double maxdiff = .15; /* max. sample difference */
38	greg	1.1
39	greg	2.8	double exposure = 1.0; /* exposure for scene */
40	greg	1.1
41	greg	2.8	double dstrsrc = 0.0; /* square source distribution */
42			double shadthresh = .1; /* shadow threshold */
43			double shadcert = .25; /* shadow certainty */
44	greg	1.16	int directrelay = 0; /* number of source relays */
45	greg	1.18	int vspretest = 128; /* virtual source pretest density */
46	greg	2.9	int directvis = 1; /* sources visible? */
47	greg	2.8	double srcsizerat = 0.; /* maximum ratio source size/dist. */
48	greg	2.15
49			COLOR cextinction = BLKCOLOR; /* global extinction coefficient */
50	greg	2.17	COLOR salbedo = BLKCOLOR; /* global scattering albedo */
51	greg	2.15	double seccg = 0.; /* global scattering eccentricity */
52			double ssampdist = 0.; /* scatter sampling distance */
53	greg	1.1
54	greg	2.8	double specthresh = .3; /* specular sampling threshold */
55			double specjitter = 1.; /* specular sampling jitter */
56	greg	2.5
57	greg	2.14	int backvis = 1; /* back face visibility */
58
59	greg	2.24	int maxdepth = 6; /* maximum recursion depth */
60	greg	2.8	double minweight = 1e-2; /* minimum ray weight */
61	greg	1.1
62	greg	2.18	char ambfile = NULL; / ambient file name */
63	greg	1.1	COLOR ambval = BLKCOLOR; /* ambient value */
64	greg	2.16	int ambvwt = 0; /* initial weight for ambient value */
65	greg	2.25	double ambacc = 0.3; /* ambient accuracy */
66	greg	2.24	int ambres = 32; /* ambient resolution */
67	greg	2.25	int ambdiv = 256; /* ambient divisions */
68			int ambssamp = 64; /* ambient super-samples */
69	greg	1.1	int ambounce = 0; /* ambient bounces */
70	greg	2.26	char amblist[AMBLLEN]; / ambient include/exclude list */
71	greg	1.1	int ambincl = -1; /* include == 1, exclude == 0 */
72
73			int greyscale = 0; /* map colors to brightness? */
74	greg	2.18	char dvcname = dev_default; / output device name */
75	greg	1.1
76			struct driver dev = NULL; / driver functions */
77
78	greg	2.11	char rifname[128]; /* rad input file name */
79
80	greg	1.1	VIEW oldview; /* previous view parameters */
81
82			PNODE ptrunk; /* the base of our image */
83			RECT pframe; /* current frame boundaries */
84			int pdepth; /* image depth in current frame */
85
86	greg	1.12	static char reserve_mem = NULL; / pre-allocated reserve memory */
87
88	greg	1.20	#define RESERVE_AMT 32768 /* amount of memory to reserve */
89	greg	1.12
90	greg	2.8	#define CTRL(c) ((c)-'@')
91	greg	1.1
92
93	greg	2.18	void
94	greg	1.1	quit(code) /* quit program */
95			int code;
96			{
97	greg	2.10	#ifdef MSTATS
98			if (code == 2 && errno == ENOMEM)
99			printmemstats(stderr);
100			#endif
101	greg	1.1	devclose();
102			exit(code);
103			}
104
105
106	greg	2.18	void
107	greg	1.1	devopen(dname) /* open device driver */
108			char *dname;
109			{
110	greg	1.6	extern char progname, octname;
111	greg	1.7	char *id;
112	greg	1.1	register int i;
113	greg	1.6
114	greg	1.7	id = octname!=NULL ? octname : progname;
115	greg	1.1	/* check device table */
116			for (i = 0; devtable[i].name; i++)
117	schorsch	2.23	if (!strcmp(dname, devtable[i].name)) {
118	greg	1.7	if ((dev = (*devtable[i].init)(dname, id)) == NULL) {
119	greg	1.1	sprintf(errmsg, "cannot initialize %s", dname);
120			error(USER, errmsg);
121			} else
122			return;
123	schorsch	2.23	}
124	greg	1.1	/* not there, try exec */
125	greg	1.7	if ((dev = comm_init(dname, id)) == NULL) {
126	greg	1.1	sprintf(errmsg, "cannot start device \"%s\"", dname);
127			error(USER, errmsg);
128			}
129			}
130
131
132	greg	2.18	void
133	greg	1.1	devclose() /* close our device */
134			{
135			if (dev != NULL)
136			(*dev->close)();
137			dev = NULL;
138			}
139
140
141	greg	2.18	void
142	greg	1.1	printdevices() /* print list of output devices */
143			{
144			register int i;
145
146			for (i = 0; devtable[i].name; i++)
147			printf("%-16s # %s\n", devtable[i].name, devtable[i].descrip);
148			}
149
150
151	greg	2.18	void
152	greg	1.1	rview() /* do a view */
153			{
154			char buf[32];
155
156	greg	2.18	devopen(dvcname); /* open device */
157	greg	1.14	newimage(); /* start image (calls fillreserves) */
158
159	greg	1.1	for ( ; ; ) { /* quit in command() */
160	greg	1.14	while (hresolu <= 1<<pdepth && vresolu <= 1<<pdepth)
161	greg	1.1	command("done: ");
162	greg	1.14	while (reserve_mem == NULL)
163			command("out of memory: ");
164			errno = 0;
165			if (hresolu <= psample<<pdepth && vresolu <= psample<<pdepth) {
166	greg	1.1	sprintf(buf, "%d sampling...\n", 1<<pdepth);
167			(*dev->comout)(buf);
168			rsample();
169			} else {
170			sprintf(buf, "%d refining...\n", 1<<pdepth);
171			(*dev->comout)(buf);
172	greg	1.9	refine(&ptrunk, 0, 0, hresolu, vresolu, pdepth+1);
173	greg	1.1	}
174	greg	1.14	if (errno == ENOMEM) /* ran out of memory */
175			freereserves();
176			else if (dev->inpready) /* noticed some input */
177	greg	1.1	command(": ");
178	greg	1.14	else /* finished this depth */
179	greg	1.1	pdepth++;
180			}
181			}
182
183
184	greg	2.18	void
185	greg	1.14	fillreserves() /* fill memory reserves */
186	greg	1.12	{
187			if (reserve_mem != NULL)
188	greg	1.14	return;
189	greg	2.18	reserve_mem = (char *)malloc(RESERVE_AMT);
190	greg	1.12	}
191
192
193	greg	2.18	void
194	greg	1.14	freereserves() /* free memory reserves */
195	greg	1.12	{
196	greg	1.14	if (reserve_mem == NULL)
197			return;
198	greg	1.12	free(reserve_mem);
199			reserve_mem = NULL;
200			}
201
202
203	greg	2.18	void
204	greg	1.1	command(prompt) /* get/execute command */
205			char *prompt;
206			{
207	greg	2.8	#define badcom(s) strncmp(s, inpbuf, args-inpbuf-1)
208	greg	1.1	char inpbuf[256];
209			char *args;
210			again:
211	greg	1.10	(dev->comin)(inpbuf, prompt); / get command + arguments */
212	greg	1.1	for (args = inpbuf; args && args != ' '; args++)
213			;
214			if (args) args++ = '\0';
215			else *++args = '\0';
216
217			switch (inpbuf[0]) {
218	greg	2.27	case 'f': /* new frame (\|focus\|free) */
219	greg	2.10	if (badcom("frame")) {
220	greg	2.27	if (badcom("focus")) {
221			if (badcom("free"))
222			goto commerr;
223			free_objmem();
224			break;
225			}
226			getfocus(args);
227	greg	2.10	break;
228			}
229	greg	1.1	getframe(args);
230			break;
231			case 'v': /* view */
232			if (badcom("view"))
233			goto commerr;
234			getview(args);
235			break;
236			case 'l': /* last view */
237			if (badcom("last"))
238			goto commerr;
239			lastview(args);
240	greg	2.11	break;
241			case 'V': /* save view */
242			if (badcom("V"))
243			goto commerr;
244			saveview(args);
245			break;
246			case 'L': /* load view */
247			if (badcom("L"))
248			goto commerr;
249			loadview(args);
250	greg	1.1	break;
251			case 'e': /* exposure */
252			if (badcom("exposure"))
253			goto commerr;
254			getexposure(args);
255			break;
256			case 's': /* set a parameter */
257	greg	2.13	if (badcom("set")) {
258			#ifdef SIGTSTP
259			if (!badcom("stop"))
260			goto dostop;
261			#endif
262	greg	1.1	goto commerr;
263	greg	2.13	}
264	greg	1.1	setparam(args);
265			break;
266			case 'n': /* new picture */
267			if (badcom("new"))
268			goto commerr;
269			newimage();
270			break;
271			case 't': /* trace a ray */
272			if (badcom("trace"))
273			goto commerr;
274			traceray(args);
275			break;
276			case 'a': /* aim camera */
277			if (badcom("aim"))
278			goto commerr;
279			getaim(args);
280			break;
281	greg	2.10	case 'm': /* move camera (or memstats) */
282	greg	1.1	if (badcom("move"))
283	greg	2.8	#ifdef MSTATS
284	greg	2.2	{
285			if (badcom("memory"))
286			goto commerr;
287			printmemstats(stderr);
288			break;
289			}
290			#else
291	greg	1.1	goto commerr;
292	greg	2.2	#endif
293	greg	1.1	getmove(args);
294			break;
295	greg	1.8	case 'r': /* rotate/repaint */
296			if (badcom("rotate")) {
297	greg	2.13	if (badcom("repaint")) {
298			if (badcom("redraw"))
299			goto commerr;
300			redraw();
301			break;
302			}
303	greg	1.8	getrepaint(args);
304			break;
305			}
306	greg	1.1	getrotate(args);
307			break;
308			case 'p': /* pivot view */
309	greg	2.13	if (badcom("pivot")) {
310			if (badcom("pause"))
311			goto commerr;
312			goto again;
313			}
314	greg	1.1	getpivot(args);
315			break;
316	greg	2.4	case CTRL('R'): /* redraw */
317	greg	1.1	redraw();
318			break;
319			case 'w': /* write */
320			if (badcom("write"))
321			goto commerr;
322			writepict(args);
323			break;
324			case 'q': /* quit */
325			if (badcom("quit"))
326			goto commerr;
327			quit(0);
328	greg	2.4	case CTRL('C'): /* interrupt */
329	greg	1.1	goto again;
330	greg	2.8	#ifdef SIGTSTP
331	greg	2.13	case CTRL('Z'):; /* stop */
332			dostop:
333	greg	1.1	devclose();
334			kill(0, SIGTSTP);
335			/* pc stops here */
336	greg	2.18	devopen(dvcname);
337	greg	1.1	redraw();
338			break;
339			#endif
340			case '\0': /* continue */
341			break;
342			default:;
343			commerr:
344			if (iscntrl(inpbuf[0]))
345			sprintf(errmsg, "^%c: unknown control",
346			inpbuf[0]\|0100);
347			else
348			sprintf(errmsg, "%s: unknown command", inpbuf);
349			error(COMMAND, errmsg);
350			break;
351			}
352	greg	2.8	#undef badcom
353	greg	1.1	}
354
355
356	greg	2.18	void
357	greg	1.1	rsample() /* sample the image */
358			{
359			int xsiz, ysiz, y;
360			RECT r;
361			PNODE *p;
362			register RECT *rl;
363	greg	2.8	register PNODE **pl;
364	greg	1.1	register int x;
365			/*
366			* We initialize the bottom row in the image at our current
367	greg	2.8	* resolution. During sampling, we check super-pixels to the
368	greg	1.1	* right and above by calling bigdiff(). If there is a significant
369			* difference, we subsample the super-pixels. The testing process
370			* includes initialization of the next row.
371			*/
372	greg	2.12	xsiz = (((long)(pframe.r-pframe.l)<<pdepth)+hresolu-1) / hresolu;
373			ysiz = (((long)(pframe.u-pframe.d)<<pdepth)+vresolu-1) / vresolu;
374	greg	1.1	rl = (RECT )malloc(xsizsizeof(RECT));
375	greg	1.12	if (rl == NULL)
376	greg	1.14	return;
377	greg	1.1	pl = (PNODE *)malloc(xsizsizeof(PNODE *));
378	greg	2.7	if (pl == NULL) {
379	greg	2.18	free((void *)rl);
380	greg	1.14	return;
381	greg	2.7	}
382	greg	1.1	/*
383			* Initialize the bottom row.
384			*/
385			rl[0].l = rl[0].d = 0;
386	greg	1.9	rl[0].r = hresolu; rl[0].u = vresolu;
387	greg	1.1	pl[0] = findrect(pframe.l, pframe.d, &ptrunk, rl, pdepth);
388			for (x = 1; x < xsiz; x++) {
389			rl[x].l = rl[x].d = 0;
390	greg	1.9	rl[x].r = hresolu; rl[x].u = vresolu;
391			pl[x] = findrect(pframe.l+((x*hresolu)>>pdepth),
392	greg	1.1	pframe.d, &ptrunk, rl+x, pdepth);
393			}
394			/* sample the image */
395			for (y = 0; /* y < ysiz */ ; y++) {
396			for (x = 0; x < xsiz-1; x++) {
397	greg	1.20	if (dev->inpready \|\| errno == ENOMEM)
398	greg	1.1	goto escape;
399			/*
400			* Test super-pixel to the right.
401			*/
402			if (pl[x] != pl[x+1] && bigdiff(pl[x]->v,
403			pl[x+1]->v, maxdiff)) {
404			refine(pl[x], rl[x].l, rl[x].d,
405			rl[x].r, rl[x].u, 1);
406			refine(pl[x+1], rl[x+1].l, rl[x+1].d,
407			rl[x+1].r, rl[x+1].u, 1);
408			}
409			}
410			if (y >= ysiz-1)
411			break;
412			for (x = 0; x < xsiz; x++) {
413	greg	1.20	if (dev->inpready \|\| errno == ENOMEM)
414	greg	1.1	goto escape;
415			/*
416			* Find super-pixel at this position in next row.
417			*/
418			r.l = r.d = 0;
419	greg	1.9	r.r = hresolu; r.u = vresolu;
420			p = findrect(pframe.l+((x*hresolu)>>pdepth),
421			pframe.d+(((y+1)*vresolu)>>pdepth),
422	greg	1.1	&ptrunk, &r, pdepth);
423			/*
424			* Test super-pixel in next row.
425			*/
426			if (pl[x] != p && bigdiff(pl[x]->v, p->v, maxdiff)) {
427			refine(pl[x], rl[x].l, rl[x].d,
428			rl[x].r, rl[x].u, 1);
429			refine(p, r.l, r.d, r.r, r.u, 1);
430			}
431			/*
432			* Copy into super-pixel array.
433			*/
434			rl[x].l = r.l; rl[x].d = r.d;
435			rl[x].r = r.r; rl[x].u = r.u;
436			pl[x] = p;
437			}
438			}
439			escape:
440	greg	2.18	free((void *)rl);
441			free((void *)pl);
442	greg	1.1	}
443
444
445			int
446			refine(p, xmin, ymin, xmax, ymax, pd) /* refine a node */
447	greg	2.8	register PNODE *p;
448	greg	1.1	int xmin, ymin, xmax, ymax;
449			int pd;
450			{
451			int growth;
452			int mx, my;
453			int i;
454
455			if (dev->inpready) /* quit for input */
456			return(0);
457
458			if (pd <= 0) /* depth limit */
459			return(0);
460
461			mx = (xmin + xmax) >> 1;
462			my = (ymin + ymax) >> 1;
463			growth = 0;
464
465			if (p->kid == NULL) { /* subdivide */
466
467			if ((p->kid = newptree()) == NULL)
468	greg	1.20	return(0);
469	greg	1.1	/*
470			* The following paint order can leave a black pixel
471	greg	2.7	* if redraw() is called in (*dev->paintr)().
472	greg	1.1	*/
473			if (p->x >= mx && p->y >= my)
474			pcopy(p, p->kid+UR);
475			else
476			paint(p->kid+UR, mx, my, xmax, ymax);
477			if (p->x < mx && p->y >= my)
478			pcopy(p, p->kid+UL);
479			else
480			paint(p->kid+UL, xmin, my, mx, ymax);
481			if (p->x >= mx && p->y < my)
482			pcopy(p, p->kid+DR);
483			else
484			paint(p->kid+DR, mx, ymin, xmax, my);
485			if (p->x < mx && p->y < my)
486			pcopy(p, p->kid+DL);
487			else
488			paint(p->kid+DL, xmin, ymin, mx, my);
489
490			growth++;
491			}
492			/* do children */
493			if (mx > pframe.l) {
494			if (my > pframe.d)
495			growth += refine(p->kid+DL, xmin, ymin, mx, my, pd-1);
496			if (my < pframe.u)
497			growth += refine(p->kid+UL, xmin, my, mx, ymax, pd-1);
498			}
499			if (mx < pframe.r) {
500			if (my > pframe.d)
501			growth += refine(p->kid+DR, mx, ymin, xmax, my, pd-1);
502			if (my < pframe.u)
503			growth += refine(p->kid+UR, mx, my, xmax, ymax, pd-1);
504			}
505			/* recompute sum */
506			if (growth) {
507			setcolor(p->v, 0.0, 0.0, 0.0);
508			for (i = 0; i < 4; i++)
509			addcolor(p->v, p->kid[i].v);
510			scalecolor(p->v, 0.25);
511			}
512			return(growth);
513			}