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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 "standard.h"
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#include "color.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(470); /* viewing parameters */
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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 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 = "X"; /* 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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#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(); /* set up image */
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for ( ; ; ) { /* quit in command() */
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while (ourview.hresolu <= 1<<pdepth &&
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ourview.vresolu <= 1<<pdepth)
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command("done: ");
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if (ourview.hresolu <= psample<<pdepth &&
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ourview.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, ourview.hresolu,
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ourview.vresolu, pdepth+1);
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}
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if (dev->inpready)
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command(": ");
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else
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pdepth++;
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}
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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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double atof();
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char inpbuf[256];
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char *args;
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again:
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(*dev->comout)(prompt); /* get command + arguments */
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(*dev->comin)(inpbuf);
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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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goto commerr;
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getmove(args);
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break;
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case 'r': /* rotate camera */
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if (badcom("rotate"))
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goto commerr;
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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)+ourview.hresolu-1) /
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ourview.hresolu;
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ysiz = (((pframe.u-pframe.d)<<pdepth)+ourview.vresolu-1) /
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ourview.vresolu;
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rl = (RECT *)malloc(xsiz*sizeof(RECT));
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pl = (PNODE **)malloc(xsiz*sizeof(PNODE *));
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if (rl == NULL || pl == NULL)
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error(SYSTEM, "out of memory in rsample");
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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 = ourview.hresolu; rl[0].u = ourview.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 = ourview.hresolu; rl[x].u = ourview.vresolu;
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pl[x] = findrect(pframe.l+((x*ourview.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)
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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)
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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 = ourview.hresolu; r.u = ourview.vresolu;
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p = findrect(pframe.l+((x*ourview.hresolu)>>pdepth),
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pframe.d+(((y+1)*ourview.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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{
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int growth;
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int mx, my;
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int i;
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if (dev->inpready) /* quit for input */
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return(0);
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if (pd <= 0) /* depth limit */
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return(0);
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mx = (xmin + xmax) >> 1;
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my = (ymin + ymax) >> 1;
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growth = 0;
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if (p->kid == NULL) { /* subdivide */
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if ((p->kid = newptree()) == NULL)
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error(SYSTEM, "out of memory in refine");
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/*
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* The following paint order can leave a black pixel
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* when redraw() is called in (*dev->paintr)().
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*/
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if (p->x >= mx && p->y >= my)
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pcopy(p, p->kid+UR);
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else
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paint(p->kid+UR, mx, my, xmax, ymax);
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if (p->x < mx && p->y >= my)
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pcopy(p, p->kid+UL);
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else
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paint(p->kid+UL, xmin, my, mx, ymax);
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if (p->x >= mx && p->y < my)
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pcopy(p, p->kid+DR);
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else
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paint(p->kid+DR, mx, ymin, xmax, my);
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if (p->x < mx && p->y < my)
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pcopy(p, p->kid+DL);
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else
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paint(p->kid+DL, xmin, ymin, mx, my);
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growth++;
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}
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/* do children */
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if (mx > pframe.l) {
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if (my > pframe.d)
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growth += refine(p->kid+DL, xmin, ymin, mx, my, pd-1);
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if (my < pframe.u)
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growth += refine(p->kid+UL, xmin, my, mx, ymax, pd-1);
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}
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if (mx < pframe.r) {
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if (my > pframe.d)
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growth += refine(p->kid+DR, mx, ymin, xmax, my, pd-1);
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if (my < pframe.u)
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growth += refine(p->kid+UR, mx, my, xmax, ymax, pd-1);
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}
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/* recompute sum */
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if (growth) {
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setcolor(p->v, 0.0, 0.0, 0.0);
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for (i = 0; i < 4; i++)
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addcolor(p->v, p->kid[i].v);
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scalecolor(p->v, 0.25);
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}
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return(growth);
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}
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