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- /* Copyright (c) 1992 Regents of the University of California */
-
- #ifndef lint
- static char SCCSid[] = "@(#)rview.c 2.9 9/22/92 LBL";
- #endif
-
- /*
- * rview.c - routines and variables for interactive view generation.
- *
- * 3/24/87
- */
-
- #include "ray.h"
-
- #include "rpaint.h"
-
- #include <signal.h>
-
- #include <ctype.h>
-
- VIEW ourview = STDVIEW; /* viewing parameters */
- int hresolu, vresolu; /* image resolution */
-
- int dimlist[MAXDIM]; /* sampling dimensions */
- int ndims = 0; /* number of sampling dimensions */
- int samplendx = 0; /* index for this sample */
-
- 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 directinvis = 0; /* sources invisible? */
- double srcsizerat = 0.; /* maximum ratio source size/dist. */
-
- double specthresh = .3; /* specular sampling threshold */
- double specjitter = 1.; /* specular sampling jitter */
-
- int maxdepth = 4; /* maximum recursion depth */
- double minweight = 1e-2; /* minimum ray weight */
-
- COLOR ambval = BLKCOLOR; /* ambient value */
- double ambacc = 0.2; /* ambient accuracy */
- int ambres = 8; /* ambient resolution */
- int ambdiv = 32; /* ambient divisions */
- int ambssamp = 0; /* ambient super-samples */
- int ambounce = 0; /* ambient bounces */
- char *amblist[128]; /* ambient include/exclude list */
- int ambincl = -1; /* include == 1, exclude == 0 */
-
- int greyscale = 0; /* map colors to brightness? */
- char *devname = dev_default; /* output device name */
-
- struct driver *dev = NULL; /* driver functions */
-
- 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)-'@')
-
-
- quit(code) /* quit program */
- int code;
- {
- devclose();
- exit(code);
- }
-
-
- 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;
- #ifndef NIX
- /* not there, try exec */
- if ((dev = comm_init(dname, id)) == NULL) {
- sprintf(errmsg, "cannot start device \"%s\"", dname);
- error(USER, errmsg);
- }
- #endif
- }
-
-
- devclose() /* close our device */
- {
- if (dev != NULL)
- (*dev->close)();
- dev = NULL;
- }
-
-
- 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);
- }
-
-
- rview() /* do a view */
- {
- char buf[32];
-
- devopen(devname); /* 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++;
- }
- }
-
-
- fillreserves() /* fill memory reserves */
- {
- if (reserve_mem != NULL)
- return;
- reserve_mem = malloc(RESERVE_AMT);
- }
-
-
- freereserves() /* free memory reserves */
- {
- if (reserve_mem == NULL)
- return;
- free(reserve_mem);
- reserve_mem = NULL;
- }
-
-
- 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 */
- if (badcom("frame"))
- goto commerr;
- 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 'e': /* exposure */
- if (badcom("exposure"))
- goto commerr;
- getexposure(args);
- break;
- case 's': /* set a parameter */
- if (badcom("set"))
- 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 */
- 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"))
- goto commerr;
- getrepaint(args);
- break;
- }
- getrotate(args);
- break;
- case 'p': /* pivot view */
- if (badcom("pivot"))
- goto commerr;
- 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 */
- devclose();
- kill(0, SIGTSTP);
- /* pc stops here */
- devopen(devname);
- 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
- }
-
-
- 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 = (((pframe.r-pframe.l)<<pdepth)+hresolu-1) / hresolu;
- ysiz = (((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((char *)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((char *)rl);
- free((char *)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);
- }
-