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/* Copyright (c) 1987 Regents of the University of California */ |
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|
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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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/* |
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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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|
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#include "standard.h" |
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|
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#include "color.h" |
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|
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#include "rpaint.h" |
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|
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#include <signal.h> |
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|
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#include <ctype.h> |
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|
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VIEW ourview = STDVIEW(470); /* viewing parameters */ |
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|
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int psample = 8; /* pixel sample size */ |
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double maxdiff = .15; /* max. sample difference */ |
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|
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double exposure = 1.0; /* exposure for scene */ |
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|
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double dstrsrc = 0.0; /* square source distribution */ |
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double shadthresh = .05; /* shadow threshold */ |
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|
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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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|
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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 = 64; /* 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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|
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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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|
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struct driver *dev = NULL; /* driver functions */ |
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|
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VIEW oldview; /* previous view parameters */ |
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|
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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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|
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#define CTRL(c) ('c'-'@') |
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|
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|
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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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|
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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; |
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char *devargv[3]; |
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register int i; |
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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)(progname)) == 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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devargv[0] = dname; |
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devargv[1] = progname; |
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devargv[2] = NULL; |
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if ((dev = comm_init(devargv)) == 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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|
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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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|
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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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|
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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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|
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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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|
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devopen(devname); /* open device */ |
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newimage(); /* set up image */ |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (dev->inpready) /* quit for input */ |
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return(0); |
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|
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if (pd <= 0) /* depth limit */ |
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return(0); |
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|
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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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|
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if (p->kid == NULL) { /* subdivide */ |
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|
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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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|
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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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} |
