| 1 |
/* Copyright (c) 1995 Regents of the University of California */ |
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|
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#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
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* rview.c - routines and variables for interactive view generation. |
| 9 |
* |
| 10 |
* 3/24/87 |
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*/ |
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|
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#include "ray.h" |
| 14 |
|
| 15 |
#include "rpaint.h" |
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|
| 17 |
#include <signal.h> |
| 18 |
|
| 19 |
#include <ctype.h> |
| 20 |
|
| 21 |
VIEW ourview = STDVIEW; /* viewing parameters */ |
| 22 |
int hresolu, vresolu; /* image resolution */ |
| 23 |
|
| 24 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
| 25 |
int ndims = 0; /* number of sampling dimensions */ |
| 26 |
int samplendx = 0; /* index for this sample */ |
| 27 |
|
| 28 |
int psample = 8; /* pixel sample size */ |
| 29 |
double maxdiff = .15; /* max. sample difference */ |
| 30 |
|
| 31 |
double exposure = 1.0; /* exposure for scene */ |
| 32 |
|
| 33 |
double dstrsrc = 0.0; /* square source distribution */ |
| 34 |
double shadthresh = .1; /* shadow threshold */ |
| 35 |
double shadcert = .25; /* shadow certainty */ |
| 36 |
int directrelay = 0; /* number of source relays */ |
| 37 |
int vspretest = 128; /* virtual source pretest density */ |
| 38 |
int directvis = 1; /* sources visible? */ |
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double srcsizerat = 0.; /* maximum ratio source size/dist. */ |
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|
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COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
| 42 |
double salbedo = 0.; /* global scattering albedo */ |
| 43 |
double seccg = 0.; /* global scattering eccentricity */ |
| 44 |
double ssampdist = 0.; /* scatter sampling distance */ |
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|
| 46 |
double specthresh = .3; /* specular sampling threshold */ |
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double specjitter = 1.; /* specular sampling jitter */ |
| 48 |
|
| 49 |
int backvis = 1; /* back face visibility */ |
| 50 |
|
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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 = 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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|
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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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|
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struct driver *dev = NULL; /* driver functions */ |
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|
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char rifname[128]; /* rad input file name */ |
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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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static char *reserve_mem = NULL; /* pre-allocated reserve memory */ |
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|
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#define RESERVE_AMT 32768 /* amount of memory to reserve */ |
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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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#ifdef MSTATS |
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if (code == 2 && errno == ENOMEM) |
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printmemstats(stderr); |
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#endif |
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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, *octname; |
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char *id; |
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register int i; |
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|
| 102 |
id = octname!=NULL ? octname : progname; |
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/* check device table */ |
| 104 |
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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#ifndef NIX |
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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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#endif |
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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 */ |
| 130 |
{ |
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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(); /* start image (calls fillreserves) */ |
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|
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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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|
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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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|
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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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|
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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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|
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switch (inpbuf[0]) { |
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case 'f': /* new frame (or free mem.) */ |
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if (badcom("frame")) { |
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if (badcom("free")) |
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goto commerr; |
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free_objmem(); |
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break; |
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} |
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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 'V': /* save view */ |
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if (badcom("V")) |
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goto commerr; |
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saveview(args); |
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break; |
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case 'L': /* load view */ |
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if (badcom("L")) |
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goto commerr; |
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loadview(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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#ifdef SIGTSTP |
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if (!badcom("stop")) |
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goto dostop; |
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#endif |
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goto commerr; |
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} |
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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 (or memstats) */ |
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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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if (badcom("redraw")) |
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goto commerr; |
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redraw(); |
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break; |
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} |
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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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if (badcom("pause")) |
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goto commerr; |
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goto again; |
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} |
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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; |
| 298 |
case 'w': /* write */ |
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if (badcom("write")) |
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goto commerr; |
| 301 |
writepict(args); |
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break; |
| 303 |
case 'q': /* quit */ |
| 304 |
if (badcom("quit")) |
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goto commerr; |
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quit(0); |
| 307 |
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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dostop: |
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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:; |
| 322 |
commerr: |
| 323 |
if (iscntrl(inpbuf[0])) |
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sprintf(errmsg, "^%c: unknown control", |
| 325 |
inpbuf[0]|0100); |
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else |
| 327 |
sprintf(errmsg, "%s: unknown command", inpbuf); |
| 328 |
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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|
| 334 |
|
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rsample() /* sample the image */ |
| 336 |
{ |
| 337 |
int xsiz, ysiz, y; |
| 338 |
RECT r; |
| 339 |
PNODE *p; |
| 340 |
register RECT *rl; |
| 341 |
register PNODE **pl; |
| 342 |
register int x; |
| 343 |
/* |
| 344 |
* We initialize the bottom row in the image at our current |
| 345 |
* resolution. During sampling, we check super-pixels to the |
| 346 |
* right and above by calling bigdiff(). If there is a significant |
| 347 |
* difference, we subsample the super-pixels. The testing process |
| 348 |
* includes initialization of the next row. |
| 349 |
*/ |
| 350 |
xsiz = (((long)(pframe.r-pframe.l)<<pdepth)+hresolu-1) / hresolu; |
| 351 |
ysiz = (((long)(pframe.u-pframe.d)<<pdepth)+vresolu-1) / vresolu; |
| 352 |
rl = (RECT *)malloc(xsiz*sizeof(RECT)); |
| 353 |
if (rl == NULL) |
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return; |
| 355 |
pl = (PNODE **)malloc(xsiz*sizeof(PNODE *)); |
| 356 |
if (pl == NULL) { |
| 357 |
free((char *)rl); |
| 358 |
return; |
| 359 |
} |
| 360 |
/* |
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* Initialize the bottom row. |
| 362 |
*/ |
| 363 |
rl[0].l = rl[0].d = 0; |
| 364 |
rl[0].r = hresolu; rl[0].u = vresolu; |
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pl[0] = findrect(pframe.l, pframe.d, &ptrunk, rl, pdepth); |
| 366 |
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); |
| 371 |
} |
| 372 |
/* sample the image */ |
| 373 |
for (y = 0; /* y < ysiz */ ; y++) { |
| 374 |
for (x = 0; x < xsiz-1; x++) { |
| 375 |
if (dev->inpready || errno == ENOMEM) |
| 376 |
goto escape; |
| 377 |
/* |
| 378 |
* Test super-pixel to the right. |
| 379 |
*/ |
| 380 |
if (pl[x] != pl[x+1] && bigdiff(pl[x]->v, |
| 381 |
pl[x+1]->v, maxdiff)) { |
| 382 |
refine(pl[x], rl[x].l, rl[x].d, |
| 383 |
rl[x].r, rl[x].u, 1); |
| 384 |
refine(pl[x+1], rl[x+1].l, rl[x+1].d, |
| 385 |
rl[x+1].r, rl[x+1].u, 1); |
| 386 |
} |
| 387 |
} |
| 388 |
if (y >= ysiz-1) |
| 389 |
break; |
| 390 |
for (x = 0; x < xsiz; x++) { |
| 391 |
if (dev->inpready || errno == ENOMEM) |
| 392 |
goto escape; |
| 393 |
/* |
| 394 |
* Find super-pixel at this position in next row. |
| 395 |
*/ |
| 396 |
r.l = r.d = 0; |
| 397 |
r.r = hresolu; r.u = vresolu; |
| 398 |
p = findrect(pframe.l+((x*hresolu)>>pdepth), |
| 399 |
pframe.d+(((y+1)*vresolu)>>pdepth), |
| 400 |
&ptrunk, &r, pdepth); |
| 401 |
/* |
| 402 |
* Test super-pixel in next row. |
| 403 |
*/ |
| 404 |
if (pl[x] != p && bigdiff(pl[x]->v, p->v, maxdiff)) { |
| 405 |
refine(pl[x], rl[x].l, rl[x].d, |
| 406 |
rl[x].r, rl[x].u, 1); |
| 407 |
refine(p, r.l, r.d, r.r, r.u, 1); |
| 408 |
} |
| 409 |
/* |
| 410 |
* Copy into super-pixel array. |
| 411 |
*/ |
| 412 |
rl[x].l = r.l; rl[x].d = r.d; |
| 413 |
rl[x].r = r.r; rl[x].u = r.u; |
| 414 |
pl[x] = p; |
| 415 |
} |
| 416 |
} |
| 417 |
escape: |
| 418 |
free((char *)rl); |
| 419 |
free((char *)pl); |
| 420 |
} |
| 421 |
|
| 422 |
|
| 423 |
int |
| 424 |
refine(p, xmin, ymin, xmax, ymax, pd) /* refine a node */ |
| 425 |
register PNODE *p; |
| 426 |
int xmin, ymin, xmax, ymax; |
| 427 |
int pd; |
| 428 |
{ |
| 429 |
int growth; |
| 430 |
int mx, my; |
| 431 |
int i; |
| 432 |
|
| 433 |
if (dev->inpready) /* quit for input */ |
| 434 |
return(0); |
| 435 |
|
| 436 |
if (pd <= 0) /* depth limit */ |
| 437 |
return(0); |
| 438 |
|
| 439 |
mx = (xmin + xmax) >> 1; |
| 440 |
my = (ymin + ymax) >> 1; |
| 441 |
growth = 0; |
| 442 |
|
| 443 |
if (p->kid == NULL) { /* subdivide */ |
| 444 |
|
| 445 |
if ((p->kid = newptree()) == NULL) |
| 446 |
return(0); |
| 447 |
/* |
| 448 |
* The following paint order can leave a black pixel |
| 449 |
* if redraw() is called in (*dev->paintr)(). |
| 450 |
*/ |
| 451 |
if (p->x >= mx && p->y >= my) |
| 452 |
pcopy(p, p->kid+UR); |
| 453 |
else |
| 454 |
paint(p->kid+UR, mx, my, xmax, ymax); |
| 455 |
if (p->x < mx && p->y >= my) |
| 456 |
pcopy(p, p->kid+UL); |
| 457 |
else |
| 458 |
paint(p->kid+UL, xmin, my, mx, ymax); |
| 459 |
if (p->x >= mx && p->y < my) |
| 460 |
pcopy(p, p->kid+DR); |
| 461 |
else |
| 462 |
paint(p->kid+DR, mx, ymin, xmax, my); |
| 463 |
if (p->x < mx && p->y < my) |
| 464 |
pcopy(p, p->kid+DL); |
| 465 |
else |
| 466 |
paint(p->kid+DL, xmin, ymin, mx, my); |
| 467 |
|
| 468 |
growth++; |
| 469 |
} |
| 470 |
/* do children */ |
| 471 |
if (mx > pframe.l) { |
| 472 |
if (my > pframe.d) |
| 473 |
growth += refine(p->kid+DL, xmin, ymin, mx, my, pd-1); |
| 474 |
if (my < pframe.u) |
| 475 |
growth += refine(p->kid+UL, xmin, my, mx, ymax, pd-1); |
| 476 |
} |
| 477 |
if (mx < pframe.r) { |
| 478 |
if (my > pframe.d) |
| 479 |
growth += refine(p->kid+DR, mx, ymin, xmax, my, pd-1); |
| 480 |
if (my < pframe.u) |
| 481 |
growth += refine(p->kid+UR, mx, my, xmax, ymax, pd-1); |
| 482 |
} |
| 483 |
/* recompute sum */ |
| 484 |
if (growth) { |
| 485 |
setcolor(p->v, 0.0, 0.0, 0.0); |
| 486 |
for (i = 0; i < 4; i++) |
| 487 |
addcolor(p->v, p->kid[i].v); |
| 488 |
scalecolor(p->v, 0.25); |
| 489 |
} |
| 490 |
return(growth); |
| 491 |
} |
