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/* Copyright (c) 1987 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* rview.c - routines and variables for interactive view generation.
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*
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* 3/24/87
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*/
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#include "ray.h"
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#include "rpaint.h"
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#include <signal.h>
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#include <ctype.h>
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VIEW ourview = STDVIEW; /* viewing parameters */
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int hresolu, vresolu; /* image resolution */
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int dimlist[MAXDIM]; /* sampling dimensions */
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int ndims = 0; /* number of sampling dimensions */
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int samplendx = 0; /* index for this sample */
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int psample = 8; /* pixel sample size */
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double maxdiff = .15; /* max. sample difference */
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double exposure = 1.0; /* exposure for scene */
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double dstrsrc = 0.0; /* square source distribution */
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double shadthresh = .1; /* shadow threshold */
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double shadcert = .25; /* shadow certainty */
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int directrelay = 0; /* number of source relays */
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int vspretest = 128; /* virtual source pretest density */
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int directinvis = 0; /* sources invisible? */
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double srcsizerat = 0.; /* maximum ratio source size/dist. */
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double specthresh = .3; /* specular sampling threshold */
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double specjitter = 1.; /* specular sampling jitter */
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int maxdepth = 4; /* maximum recursion depth */
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double minweight = 1e-2; /* minimum ray weight */
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COLOR ambval = BLKCOLOR; /* ambient value */
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double ambacc = 0.2; /* ambient accuracy */
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int ambres = 8; /* ambient resolution */
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int ambdiv = 32; /* ambient divisions */
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int ambssamp = 0; /* ambient super-samples */
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int ambounce = 0; /* ambient bounces */
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char *amblist[128]; /* ambient include/exclude list */
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int ambincl = -1; /* include == 1, exclude == 0 */
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int greyscale = 0; /* map colors to brightness? */
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char *devname = dev_default; /* output device name */
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struct driver *dev = NULL; /* driver functions */
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VIEW oldview; /* previous view parameters */
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PNODE ptrunk; /* the base of our image */
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RECT pframe; /* current frame boundaries */
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int pdepth; /* image depth in current frame */
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static char *reserve_mem = NULL; /* pre-allocated reserve memory */
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#define RESERVE_AMT 32768 /* amount of memory to reserve */
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#define CTRL(c) ((c)-'@')
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quit(code) /* quit program */
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int code;
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{
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devclose();
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exit(code);
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}
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devopen(dname) /* open device driver */
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char *dname;
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{
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extern char *progname, *octname;
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char *id;
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register int i;
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id = octname!=NULL ? octname : progname;
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/* check device table */
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for (i = 0; devtable[i].name; i++)
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if (!strcmp(dname, devtable[i].name))
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if ((dev = (*devtable[i].init)(dname, id)) == NULL) {
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sprintf(errmsg, "cannot initialize %s", dname);
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error(USER, errmsg);
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} else
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return;
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/* not there, try exec */
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if ((dev = comm_init(dname, id)) == NULL) {
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sprintf(errmsg, "cannot start device \"%s\"", dname);
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error(USER, errmsg);
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}
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}
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devclose() /* close our device */
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{
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if (dev != NULL)
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(*dev->close)();
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dev = NULL;
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}
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printdevices() /* print list of output devices */
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{
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register int i;
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for (i = 0; devtable[i].name; i++)
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printf("%-16s # %s\n", devtable[i].name, devtable[i].descrip);
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}
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rview() /* do a view */
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{
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char buf[32];
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devopen(devname); /* open device */
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newimage(); /* start image (calls fillreserves) */
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for ( ; ; ) { /* quit in command() */
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while (hresolu <= 1<<pdepth && vresolu <= 1<<pdepth)
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command("done: ");
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while (reserve_mem == NULL)
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command("out of memory: ");
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errno = 0;
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if (hresolu <= psample<<pdepth && vresolu <= psample<<pdepth) {
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sprintf(buf, "%d sampling...\n", 1<<pdepth);
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(*dev->comout)(buf);
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rsample();
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} else {
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sprintf(buf, "%d refining...\n", 1<<pdepth);
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(*dev->comout)(buf);
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refine(&ptrunk, 0, 0, hresolu, vresolu, pdepth+1);
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}
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if (errno == ENOMEM) /* ran out of memory */
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freereserves();
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else if (dev->inpready) /* noticed some input */
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command(": ");
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else /* finished this depth */
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pdepth++;
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}
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}
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fillreserves() /* fill memory reserves */
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{
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if (reserve_mem != NULL)
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return;
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reserve_mem = malloc(RESERVE_AMT);
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}
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freereserves() /* free memory reserves */
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{
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if (reserve_mem == NULL)
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return;
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free(reserve_mem);
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reserve_mem = NULL;
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}
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command(prompt) /* get/execute command */
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char *prompt;
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{
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#define badcom(s) strncmp(s, inpbuf, args-inpbuf-1)
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char inpbuf[256];
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char *args;
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again:
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(*dev->comin)(inpbuf, prompt); /* get command + arguments */
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for (args = inpbuf; *args && *args != ' '; args++)
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;
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if (*args) *args++ = '\0';
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else *++args = '\0';
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switch (inpbuf[0]) {
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case 'f': /* new frame */
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if (badcom("frame"))
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goto commerr;
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getframe(args);
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break;
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case 'v': /* view */
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if (badcom("view"))
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goto commerr;
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getview(args);
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break;
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case 'l': /* last view */
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if (badcom("last"))
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goto commerr;
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lastview(args);
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break;
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case 'e': /* exposure */
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if (badcom("exposure"))
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goto commerr;
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getexposure(args);
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break;
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case 's': /* set a parameter */
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if (badcom("set"))
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goto commerr;
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setparam(args);
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break;
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case 'n': /* new picture */
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if (badcom("new"))
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goto commerr;
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newimage();
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break;
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case 't': /* trace a ray */
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if (badcom("trace"))
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goto commerr;
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traceray(args);
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break;
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case 'a': /* aim camera */
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if (badcom("aim"))
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goto commerr;
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getaim(args);
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break;
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case 'm': /* move camera */
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if (badcom("move"))
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#ifdef MSTATS
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{
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if (badcom("memory"))
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goto commerr;
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printmemstats(stderr);
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break;
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}
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#else
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goto commerr;
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#endif
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getmove(args);
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break;
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case 'r': /* rotate/repaint */
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if (badcom("rotate")) {
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if (badcom("repaint"))
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goto commerr;
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getrepaint(args);
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break;
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}
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getrotate(args);
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break;
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case 'p': /* pivot view */
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if (badcom("pivot"))
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goto commerr;
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getpivot(args);
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break;
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case CTRL('R'): /* redraw */
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redraw();
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break;
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case 'w': /* write */
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if (badcom("write"))
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goto commerr;
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writepict(args);
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break;
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case 'q': /* quit */
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if (badcom("quit"))
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goto commerr;
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quit(0);
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case CTRL('C'): /* interrupt */
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goto again;
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#ifdef SIGTSTP
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case CTRL('Z'): /* stop */
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devclose();
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kill(0, SIGTSTP);
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/* pc stops here */
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devopen(devname);
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redraw();
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break;
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#endif
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case '\0': /* continue */
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break;
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default:;
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commerr:
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if (iscntrl(inpbuf[0]))
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sprintf(errmsg, "^%c: unknown control",
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inpbuf[0]|0100);
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else
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sprintf(errmsg, "%s: unknown command", inpbuf);
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error(COMMAND, errmsg);
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break;
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}
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#undef badcom
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}
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rsample() /* sample the image */
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{
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int xsiz, ysiz, y;
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RECT r;
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PNODE *p;
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register RECT *rl;
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register PNODE **pl;
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register int x;
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/*
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* We initialize the bottom row in the image at our current
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* resolution. During sampling, we check super-pixels to the
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* right and above by calling bigdiff(). If there is a significant
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* difference, we subsample the super-pixels. The testing process
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* includes initialization of the next row.
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*/
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xsiz = (((pframe.r-pframe.l)<<pdepth)+hresolu-1) / hresolu;
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ysiz = (((pframe.u-pframe.d)<<pdepth)+vresolu-1) / vresolu;
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rl = (RECT *)malloc(xsiz*sizeof(RECT));
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if (rl == NULL)
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return;
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pl = (PNODE **)malloc(xsiz*sizeof(PNODE *));
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if (pl == NULL)
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return;
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/*
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* Initialize the bottom row.
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*/
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rl[0].l = rl[0].d = 0;
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rl[0].r = hresolu; rl[0].u = vresolu;
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pl[0] = findrect(pframe.l, pframe.d, &ptrunk, rl, pdepth);
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for (x = 1; x < xsiz; x++) {
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rl[x].l = rl[x].d = 0;
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rl[x].r = hresolu; rl[x].u = vresolu;
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pl[x] = findrect(pframe.l+((x*hresolu)>>pdepth),
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pframe.d, &ptrunk, rl+x, pdepth);
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}
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/* sample the image */
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for (y = 0; /* y < ysiz */ ; y++) {
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for (x = 0; x < xsiz-1; x++) {
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if (dev->inpready || errno == ENOMEM)
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goto escape;
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/*
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* Test super-pixel to the right.
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*/
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if (pl[x] != pl[x+1] && bigdiff(pl[x]->v,
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pl[x+1]->v, maxdiff)) {
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refine(pl[x], rl[x].l, rl[x].d,
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rl[x].r, rl[x].u, 1);
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refine(pl[x+1], rl[x+1].l, rl[x+1].d,
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rl[x+1].r, rl[x+1].u, 1);
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}
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}
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if (y >= ysiz-1)
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break;
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for (x = 0; x < xsiz; x++) {
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if (dev->inpready || errno == ENOMEM)
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goto escape;
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/*
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* Find super-pixel at this position in next row.
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*/
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r.l = r.d = 0;
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r.r = hresolu; r.u = vresolu;
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p = findrect(pframe.l+((x*hresolu)>>pdepth),
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pframe.d+(((y+1)*vresolu)>>pdepth),
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&ptrunk, &r, pdepth);
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/*
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* Test super-pixel in next row.
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*/
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if (pl[x] != p && bigdiff(pl[x]->v, p->v, maxdiff)) {
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refine(pl[x], rl[x].l, rl[x].d,
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rl[x].r, rl[x].u, 1);
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refine(p, r.l, r.d, r.r, r.u, 1);
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}
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/*
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* Copy into super-pixel array.
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*/
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rl[x].l = r.l; rl[x].d = r.d;
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rl[x].r = r.r; rl[x].u = r.u;
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pl[x] = p;
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}
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}
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escape:
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free((char *)rl);
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free((char *)pl);
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}
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int
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refine(p, xmin, ymin, xmax, ymax, pd) /* refine a node */
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register PNODE *p;
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int xmin, ymin, xmax, ymax;
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int pd;
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| 384 |
{
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| 385 |
int growth;
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int mx, my;
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int i;
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| 388 |
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| 389 |
if (dev->inpready) /* quit for input */
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return(0);
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| 391 |
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| 392 |
if (pd <= 0) /* depth limit */
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return(0);
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| 394 |
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| 395 |
mx = (xmin + xmax) >> 1;
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| 396 |
my = (ymin + ymax) >> 1;
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| 397 |
growth = 0;
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| 398 |
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| 399 |
if (p->kid == NULL) { /* subdivide */
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| 401 |
if ((p->kid = newptree()) == NULL)
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| 402 |
return(0);
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| 403 |
/*
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| 404 |
* The following paint order can leave a black pixel
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| 405 |
* when redraw() is called in (*dev->paintr)().
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| 406 |
*/
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| 407 |
if (p->x >= mx && p->y >= my)
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| 408 |
pcopy(p, p->kid+UR);
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| 409 |
else
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| 410 |
paint(p->kid+UR, mx, my, xmax, ymax);
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| 411 |
if (p->x < mx && p->y >= my)
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| 412 |
pcopy(p, p->kid+UL);
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| 413 |
else
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| 414 |
paint(p->kid+UL, xmin, my, mx, ymax);
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| 415 |
if (p->x >= mx && p->y < my)
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| 416 |
pcopy(p, p->kid+DR);
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| 417 |
else
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| 418 |
paint(p->kid+DR, mx, ymin, xmax, my);
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| 419 |
if (p->x < mx && p->y < my)
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| 420 |
pcopy(p, p->kid+DL);
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| 421 |
else
|
| 422 |
paint(p->kid+DL, xmin, ymin, mx, my);
|
| 423 |
|
| 424 |
growth++;
|
| 425 |
}
|
| 426 |
/* do children */
|
| 427 |
if (mx > pframe.l) {
|
| 428 |
if (my > pframe.d)
|
| 429 |
growth += refine(p->kid+DL, xmin, ymin, mx, my, pd-1);
|
| 430 |
if (my < pframe.u)
|
| 431 |
growth += refine(p->kid+UL, xmin, my, mx, ymax, pd-1);
|
| 432 |
}
|
| 433 |
if (mx < pframe.r) {
|
| 434 |
if (my > pframe.d)
|
| 435 |
growth += refine(p->kid+DR, mx, ymin, xmax, my, pd-1);
|
| 436 |
if (my < pframe.u)
|
| 437 |
growth += refine(p->kid+UR, mx, my, xmax, ymax, pd-1);
|
| 438 |
}
|
| 439 |
/* recompute sum */
|
| 440 |
if (growth) {
|
| 441 |
setcolor(p->v, 0.0, 0.0, 0.0);
|
| 442 |
for (i = 0; i < 4; i++)
|
| 443 |
addcolor(p->v, p->kid[i].v);
|
| 444 |
scalecolor(p->v, 0.25);
|
| 445 |
}
|
| 446 |
return(growth);
|
| 447 |
}
|
