1 |
greg |
1.24 |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
greg |
1.1 |
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3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
5 |
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#endif |
6 |
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7 |
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/* |
8 |
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* rpict.c - routines and variables for picture generation. |
9 |
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* |
10 |
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* 8/14/85 |
11 |
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*/ |
12 |
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13 |
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#include "ray.h" |
14 |
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15 |
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#ifdef BSD |
16 |
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#include <sys/time.h> |
17 |
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#include <sys/resource.h> |
18 |
greg |
1.34 |
#endif |
19 |
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20 |
greg |
1.14 |
#include <signal.h> |
21 |
greg |
1.18 |
#include <fcntl.h> |
22 |
greg |
1.1 |
|
23 |
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#include "view.h" |
24 |
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25 |
greg |
1.36 |
#include "resolu.h" |
26 |
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27 |
greg |
1.1 |
#include "random.h" |
28 |
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29 |
greg |
1.25 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
30 |
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int ndims = 0; /* number of sampling dimensions */ |
31 |
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int samplendx; /* sample index number */ |
32 |
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33 |
greg |
1.12 |
VIEW ourview = STDVIEW; /* view parameters */ |
34 |
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int hresolu = 512; /* horizontal resolution */ |
35 |
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int vresolu = 512; /* vertical resolution */ |
36 |
greg |
1.13 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
37 |
greg |
1.1 |
|
38 |
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int psample = 4; /* pixel sample size */ |
39 |
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double maxdiff = .05; /* max. difference for interpolation */ |
40 |
greg |
1.3 |
double dstrpix = 0.67; /* square pixel distribution */ |
41 |
greg |
1.1 |
|
42 |
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double dstrsrc = 0.0; /* square source distribution */ |
43 |
greg |
1.4 |
double shadthresh = .05; /* shadow threshold */ |
44 |
greg |
1.5 |
double shadcert = .5; /* shadow certainty */ |
45 |
greg |
1.35 |
int directrelay = 1; /* number of source relays */ |
46 |
greg |
1.29 |
int vspretest = 512; /* virtual source pretest density */ |
47 |
greg |
1.30 |
int directinvis = 0; /* sources invisible? */ |
48 |
greg |
1.35 |
double srcsizerat = .25; /* maximum ratio source size/dist. */ |
49 |
greg |
1.1 |
|
50 |
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int maxdepth = 6; /* maximum recursion depth */ |
51 |
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double minweight = 5e-3; /* minimum ray weight */ |
52 |
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53 |
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COLOR ambval = BLKCOLOR; /* ambient value */ |
54 |
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double ambacc = 0.2; /* ambient accuracy */ |
55 |
greg |
1.6 |
int ambres = 32; /* ambient resolution */ |
56 |
greg |
1.1 |
int ambdiv = 128; /* ambient divisions */ |
57 |
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int ambssamp = 0; /* ambient super-samples */ |
58 |
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int ambounce = 0; /* ambient bounces */ |
59 |
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char *amblist[128]; /* ambient include/exclude list */ |
60 |
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int ambincl = -1; /* include == 1, exclude == 0 */ |
61 |
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62 |
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int ralrm = 0; /* seconds between reports */ |
63 |
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64 |
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double pctdone = 0.0; /* percentage done */ |
65 |
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66 |
greg |
1.24 |
long tlastrept = 0L; /* time at last report */ |
67 |
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68 |
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extern long time(); |
69 |
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extern long tstart; /* starting time */ |
70 |
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71 |
greg |
1.1 |
extern long nrays; /* number of rays traced */ |
72 |
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73 |
greg |
2.2 |
#define MAXDIV 16 /* maximum sample size */ |
74 |
greg |
1.1 |
|
75 |
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#define pixjitter() (.5+dstrpix*(.5-frandom())) |
76 |
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77 |
greg |
1.11 |
double pixvalue(); |
78 |
greg |
1.1 |
|
79 |
greg |
1.11 |
|
80 |
greg |
1.1 |
quit(code) /* quit program */ |
81 |
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int code; |
82 |
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{ |
83 |
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if (code || ralrm > 0) /* report status */ |
84 |
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report(); |
85 |
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86 |
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exit(code); |
87 |
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} |
88 |
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89 |
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90 |
greg |
1.24 |
#ifdef BSD |
91 |
greg |
1.1 |
report() /* report progress */ |
92 |
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{ |
93 |
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struct rusage rubuf; |
94 |
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double t; |
95 |
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96 |
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getrusage(RUSAGE_SELF, &rubuf); |
97 |
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t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
98 |
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t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
99 |
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getrusage(RUSAGE_CHILDREN, &rubuf); |
100 |
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t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
101 |
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t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
102 |
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103 |
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sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n", |
104 |
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nrays, pctdone, t/3600.0); |
105 |
greg |
1.24 |
eputs(errmsg); |
106 |
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tlastrept = time((long *)0); |
107 |
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} |
108 |
greg |
1.1 |
#else |
109 |
greg |
1.24 |
report() /* report progress */ |
110 |
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{ |
111 |
greg |
1.14 |
signal(SIGALRM, report); |
112 |
greg |
1.24 |
tlastrept = time((long *)0); |
113 |
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sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f hours\n", |
114 |
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nrays, pctdone, (tlastrept-tstart)/3600.0); |
115 |
greg |
1.1 |
eputs(errmsg); |
116 |
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} |
117 |
greg |
1.24 |
#endif |
118 |
greg |
1.1 |
|
119 |
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120 |
greg |
1.11 |
render(zfile, oldfile) /* render the scene */ |
121 |
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char *zfile, *oldfile; |
122 |
greg |
1.1 |
{ |
123 |
greg |
1.16 |
extern long lseek(); |
124 |
greg |
1.1 |
COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
125 |
greg |
1.11 |
float *zbar[MAXDIV+1]; /* z values */ |
126 |
greg |
2.2 |
char *sampdens; /* previous sample density */ |
127 |
greg |
1.1 |
int ypos; /* current scanline */ |
128 |
greg |
1.15 |
int ystep; /* current y step size */ |
129 |
greg |
1.33 |
int hstep; /* h step size */ |
130 |
greg |
1.16 |
int zfd; |
131 |
greg |
1.1 |
COLOR *colptr; |
132 |
greg |
1.11 |
float *zptr; |
133 |
greg |
1.1 |
register int i; |
134 |
greg |
1.10 |
/* check sampling */ |
135 |
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if (psample < 1) |
136 |
greg |
1.1 |
psample = 1; |
137 |
greg |
1.26 |
else if (psample > MAXDIV) { |
138 |
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sprintf(errmsg, "pixel sampling reduced from %d to %d", |
139 |
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psample, MAXDIV); |
140 |
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error(WARNING, errmsg); |
141 |
greg |
1.10 |
psample = MAXDIV; |
142 |
greg |
1.26 |
} |
143 |
greg |
1.9 |
/* allocate scanlines */ |
144 |
greg |
1.1 |
for (i = 0; i <= psample; i++) { |
145 |
greg |
1.12 |
scanbar[i] = (COLOR *)malloc(hresolu*sizeof(COLOR)); |
146 |
greg |
1.1 |
if (scanbar[i] == NULL) |
147 |
greg |
1.11 |
goto memerr; |
148 |
greg |
1.1 |
} |
149 |
greg |
2.2 |
hstep = (psample*140+49)/99; /* quincunx sampling */ |
150 |
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ystep = (psample*99+70)/140; |
151 |
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if (hstep > 2) { |
152 |
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i = hresolu/hstep + 2; |
153 |
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if ((sampdens = malloc(i)) == NULL) |
154 |
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goto memerr; |
155 |
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while (i--) |
156 |
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sampdens[i] = hstep; |
157 |
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} else |
158 |
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sampdens = NULL; |
159 |
greg |
1.11 |
/* open z file */ |
160 |
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if (zfile != NULL) { |
161 |
greg |
1.16 |
if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) { |
162 |
greg |
1.11 |
sprintf(errmsg, "cannot open z file \"%s\"", zfile); |
163 |
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error(SYSTEM, errmsg); |
164 |
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} |
165 |
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for (i = 0; i <= psample; i++) { |
166 |
greg |
1.12 |
zbar[i] = (float *)malloc(hresolu*sizeof(float)); |
167 |
greg |
1.11 |
if (zbar[i] == NULL) |
168 |
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goto memerr; |
169 |
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} |
170 |
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} else { |
171 |
greg |
1.16 |
zfd = -1; |
172 |
greg |
1.11 |
for (i = 0; i <= psample; i++) |
173 |
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zbar[i] = NULL; |
174 |
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} |
175 |
greg |
1.1 |
/* write out boundaries */ |
176 |
greg |
1.36 |
fprtresolu(hresolu, vresolu, stdout); |
177 |
greg |
1.10 |
/* recover file and compute first */ |
178 |
greg |
1.11 |
i = salvage(oldfile); |
179 |
greg |
1.23 |
if (zfd != -1 && i > 0 && |
180 |
|
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lseek(zfd, (long)i*hresolu*sizeof(float), 0) == -1) |
181 |
greg |
1.11 |
error(SYSTEM, "z file seek error in render"); |
182 |
greg |
1.24 |
pctdone = 100.0*i/vresolu; |
183 |
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if (ralrm > 0) /* report init stats */ |
184 |
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report(); |
185 |
greg |
1.32 |
#ifndef BSD |
186 |
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else |
187 |
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#endif |
188 |
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signal(SIGALRM, report); |
189 |
greg |
1.12 |
ypos = vresolu-1 - i; |
190 |
greg |
2.2 |
fillscanline(scanbar[0], zbar[0], sampdens, hresolu, ypos, hstep); |
191 |
greg |
1.10 |
/* compute scanlines */ |
192 |
greg |
1.15 |
for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
193 |
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/* bottom adjust? */ |
194 |
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if (ypos < 0) { |
195 |
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ystep += ypos; |
196 |
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ypos = 0; |
197 |
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} |
198 |
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colptr = scanbar[ystep]; /* move base to top */ |
199 |
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scanbar[ystep] = scanbar[0]; |
200 |
greg |
1.1 |
scanbar[0] = colptr; |
201 |
greg |
1.15 |
zptr = zbar[ystep]; |
202 |
|
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zbar[ystep] = zbar[0]; |
203 |
greg |
1.11 |
zbar[0] = zptr; |
204 |
greg |
1.10 |
/* fill base line */ |
205 |
greg |
2.2 |
fillscanline(scanbar[0], zbar[0], sampdens, |
206 |
|
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hresolu, ypos, hstep); |
207 |
greg |
1.10 |
/* fill bar */ |
208 |
greg |
1.15 |
fillscanbar(scanbar, zbar, hresolu, ypos, ystep); |
209 |
greg |
1.10 |
/* write it out */ |
210 |
greg |
1.32 |
#ifndef BSD |
211 |
|
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signal(SIGALRM, SIG_IGN); /* don't interrupt writes */ |
212 |
|
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#endif |
213 |
greg |
1.15 |
for (i = ystep; i > 0; i--) { |
214 |
greg |
1.17 |
if (zfd != -1 && write(zfd, (char *)zbar[i], |
215 |
|
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hresolu*sizeof(float)) |
216 |
greg |
1.16 |
< hresolu*sizeof(float)) |
217 |
greg |
1.1 |
goto writerr; |
218 |
greg |
1.17 |
if (fwritescan(scanbar[i], hresolu, stdout) < 0) |
219 |
greg |
1.11 |
goto writerr; |
220 |
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} |
221 |
greg |
1.1 |
if (fflush(stdout) == EOF) |
222 |
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goto writerr; |
223 |
greg |
1.24 |
/* record progress */ |
224 |
|
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pctdone = 100.0*(vresolu-1-ypos)/vresolu; |
225 |
|
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if (ralrm > 0 && time((long *)0) >= tlastrept+ralrm) |
226 |
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report(); |
227 |
greg |
1.32 |
#ifndef BSD |
228 |
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else |
229 |
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signal(SIGALRM, report); |
230 |
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#endif |
231 |
greg |
1.1 |
} |
232 |
greg |
1.11 |
/* clean up */ |
233 |
greg |
1.16 |
if (zfd != -1) { |
234 |
greg |
1.17 |
if (write(zfd, (char *)zbar[0], hresolu*sizeof(float)) |
235 |
greg |
1.16 |
< hresolu*sizeof(float)) |
236 |
greg |
1.11 |
goto writerr; |
237 |
greg |
1.20 |
if (close(zfd) == -1) |
238 |
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goto writerr; |
239 |
greg |
1.11 |
for (i = 0; i <= psample; i++) |
240 |
|
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free((char *)zbar[i]); |
241 |
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} |
242 |
greg |
1.15 |
fwritescan(scanbar[0], hresolu, stdout); |
243 |
greg |
1.10 |
if (fflush(stdout) == EOF) |
244 |
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goto writerr; |
245 |
greg |
1.1 |
for (i = 0; i <= psample; i++) |
246 |
|
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free((char *)scanbar[i]); |
247 |
greg |
2.2 |
if (sampdens != NULL) |
248 |
|
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free(sampdens); |
249 |
greg |
1.11 |
pctdone = 100.0; |
250 |
greg |
1.1 |
return; |
251 |
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writerr: |
252 |
|
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error(SYSTEM, "write error in render"); |
253 |
greg |
1.11 |
memerr: |
254 |
|
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error(SYSTEM, "out of memory in render"); |
255 |
greg |
1.1 |
} |
256 |
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257 |
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|
258 |
greg |
2.2 |
fillscanline(scanline, zline, sd, xres, y, xstep) /* fill scan at y */ |
259 |
greg |
1.1 |
register COLOR *scanline; |
260 |
greg |
1.11 |
register float *zline; |
261 |
greg |
2.2 |
register char *sd; |
262 |
greg |
1.9 |
int xres, y, xstep; |
263 |
greg |
1.1 |
{ |
264 |
greg |
1.33 |
static int nc = 0; /* number of calls */ |
265 |
greg |
2.2 |
int bl = xstep, b = xstep; |
266 |
greg |
1.11 |
double z; |
267 |
greg |
1.1 |
register int i; |
268 |
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|
269 |
greg |
1.11 |
z = pixvalue(scanline[0], 0, y); |
270 |
|
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if (zline) zline[0] = z; |
271 |
greg |
1.33 |
/* zig-zag start for quincunx pattern */ |
272 |
greg |
2.2 |
for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) { |
273 |
greg |
1.15 |
if (i >= xres) { |
274 |
|
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xstep += xres-1-i; |
275 |
|
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i = xres-1; |
276 |
|
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} |
277 |
greg |
1.11 |
z = pixvalue(scanline[i], i, y); |
278 |
|
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if (zline) zline[i] = z; |
279 |
greg |
2.2 |
if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1]; |
280 |
greg |
2.3 |
if (i <= xstep) |
281 |
|
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b = fillsample(scanline, zline, 0, y, i, 0, b/2); |
282 |
|
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else |
283 |
|
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b = fillsample(scanline+i-xstep, |
284 |
|
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zline ? zline+i-xstep : NULL, |
285 |
|
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i-xstep, y, xstep, 0, b/2); |
286 |
greg |
2.2 |
if (sd) *sd++ = nc & 1 ? bl : b; |
287 |
|
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bl = b; |
288 |
greg |
1.1 |
} |
289 |
greg |
2.2 |
if (sd && nc & 1) *sd = bl; |
290 |
greg |
1.1 |
} |
291 |
|
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|
292 |
|
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|
293 |
greg |
1.11 |
fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */ |
294 |
greg |
1.1 |
register COLOR *scanbar[]; |
295 |
greg |
1.11 |
register float *zbar[]; |
296 |
greg |
1.9 |
int xres, y, ysize; |
297 |
greg |
1.1 |
{ |
298 |
|
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COLOR vline[MAXDIV+1]; |
299 |
greg |
1.11 |
float zline[MAXDIV+1]; |
300 |
greg |
1.1 |
int b = ysize; |
301 |
|
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register int i, j; |
302 |
|
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|
303 |
greg |
1.8 |
for (i = 0; i < xres; i++) { |
304 |
greg |
1.1 |
|
305 |
|
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copycolor(vline[0], scanbar[0][i]); |
306 |
|
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copycolor(vline[ysize], scanbar[ysize][i]); |
307 |
greg |
1.11 |
if (zbar[0]) { |
308 |
|
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zline[0] = zbar[0][i]; |
309 |
|
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zline[ysize] = zbar[ysize][i]; |
310 |
|
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} |
311 |
greg |
1.1 |
|
312 |
greg |
1.11 |
b = fillsample(vline, zbar[0] ? zline : NULL, |
313 |
|
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i, y, 0, ysize, b/2); |
314 |
greg |
1.1 |
|
315 |
|
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for (j = 1; j < ysize; j++) |
316 |
|
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copycolor(scanbar[j][i], vline[j]); |
317 |
greg |
1.11 |
if (zbar[0]) |
318 |
|
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for (j = 1; j < ysize; j++) |
319 |
|
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zbar[j][i] = zline[j]; |
320 |
greg |
1.1 |
} |
321 |
|
|
} |
322 |
|
|
|
323 |
|
|
|
324 |
|
|
int |
325 |
greg |
1.11 |
fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */ |
326 |
greg |
1.1 |
register COLOR *colline; |
327 |
greg |
1.11 |
register float *zline; |
328 |
greg |
1.1 |
int x, y; |
329 |
|
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int xlen, ylen; |
330 |
|
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int b; |
331 |
|
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{ |
332 |
greg |
1.11 |
extern double fabs(); |
333 |
greg |
1.1 |
double ratio; |
334 |
greg |
1.11 |
double z; |
335 |
greg |
1.1 |
COLOR ctmp; |
336 |
|
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int ncut; |
337 |
|
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register int len; |
338 |
|
|
|
339 |
|
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if (xlen > 0) /* x or y length is zero */ |
340 |
|
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len = xlen; |
341 |
|
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else |
342 |
|
|
len = ylen; |
343 |
|
|
|
344 |
|
|
if (len <= 1) /* limit recursion */ |
345 |
|
|
return(0); |
346 |
|
|
|
347 |
greg |
1.11 |
if (b > 0 |
348 |
|
|
|| (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
349 |
|
|
|| bigdiff(colline[0], colline[len], maxdiff)) { |
350 |
greg |
1.1 |
|
351 |
greg |
1.11 |
z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
352 |
|
|
if (zline) zline[len>>1] = z; |
353 |
greg |
1.1 |
ncut = 1; |
354 |
|
|
|
355 |
|
|
} else { /* interpolate */ |
356 |
|
|
|
357 |
|
|
copycolor(colline[len>>1], colline[len]); |
358 |
|
|
ratio = (double)(len>>1) / len; |
359 |
|
|
scalecolor(colline[len>>1], ratio); |
360 |
greg |
1.11 |
if (zline) zline[len>>1] = zline[len] * ratio; |
361 |
|
|
ratio = 1.0 - ratio; |
362 |
greg |
1.1 |
copycolor(ctmp, colline[0]); |
363 |
|
|
scalecolor(ctmp, ratio); |
364 |
|
|
addcolor(colline[len>>1], ctmp); |
365 |
greg |
1.11 |
if (zline) zline[len>>1] += zline[0] * ratio; |
366 |
greg |
1.1 |
ncut = 0; |
367 |
|
|
} |
368 |
|
|
/* recurse */ |
369 |
greg |
1.11 |
ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
370 |
greg |
1.1 |
|
371 |
greg |
1.11 |
ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL, |
372 |
|
|
x+(xlen>>1), y+(ylen>>1), |
373 |
|
|
xlen-(xlen>>1), ylen-(ylen>>1), b/2); |
374 |
greg |
1.1 |
|
375 |
|
|
return(ncut); |
376 |
|
|
} |
377 |
|
|
|
378 |
|
|
|
379 |
greg |
1.11 |
double |
380 |
greg |
1.1 |
pixvalue(col, x, y) /* compute pixel value */ |
381 |
|
|
COLOR col; /* returned color */ |
382 |
|
|
int x, y; /* pixel position */ |
383 |
|
|
{ |
384 |
greg |
1.25 |
static RAY thisray; |
385 |
greg |
1.1 |
|
386 |
greg |
1.22 |
if (viewray(thisray.rorg, thisray.rdir, &ourview, |
387 |
|
|
(x+pixjitter())/hresolu, (y+pixjitter())/vresolu) < 0) { |
388 |
|
|
setcolor(col, 0.0, 0.0, 0.0); |
389 |
|
|
return(0.0); |
390 |
|
|
} |
391 |
greg |
1.1 |
|
392 |
|
|
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
393 |
greg |
1.25 |
|
394 |
greg |
1.31 |
samplendx = pixnumber(x,y,hresolu,vresolu); /* set pixel index */ |
395 |
greg |
1.25 |
|
396 |
greg |
1.1 |
rayvalue(&thisray); /* trace ray */ |
397 |
|
|
|
398 |
|
|
copycolor(col, thisray.rcol); /* return color */ |
399 |
greg |
1.11 |
|
400 |
greg |
1.20 |
return(thisray.rt); /* return distance */ |
401 |
greg |
1.1 |
} |
402 |
|
|
|
403 |
|
|
|
404 |
|
|
int |
405 |
|
|
salvage(oldfile) /* salvage scanlines from killed program */ |
406 |
|
|
char *oldfile; |
407 |
|
|
{ |
408 |
|
|
COLR *scanline; |
409 |
|
|
FILE *fp; |
410 |
|
|
int x, y; |
411 |
|
|
|
412 |
|
|
if (oldfile == NULL) |
413 |
|
|
return(0); |
414 |
greg |
1.9 |
|
415 |
|
|
if ((fp = fopen(oldfile, "r")) == NULL) { |
416 |
greg |
1.1 |
sprintf(errmsg, "cannot open recover file \"%s\"", oldfile); |
417 |
|
|
error(WARNING, errmsg); |
418 |
|
|
return(0); |
419 |
|
|
} |
420 |
|
|
/* discard header */ |
421 |
|
|
getheader(fp, NULL); |
422 |
|
|
/* get picture size */ |
423 |
greg |
1.36 |
if (!fscnresolu(&x, &y, fp)) { |
424 |
greg |
1.2 |
sprintf(errmsg, "bad recover file \"%s\"", oldfile); |
425 |
|
|
error(WARNING, errmsg); |
426 |
greg |
1.1 |
fclose(fp); |
427 |
|
|
return(0); |
428 |
|
|
} |
429 |
|
|
|
430 |
greg |
1.12 |
if (x != hresolu || y != vresolu) { |
431 |
greg |
1.1 |
sprintf(errmsg, "resolution mismatch in recover file \"%s\"", |
432 |
|
|
oldfile); |
433 |
|
|
error(USER, errmsg); |
434 |
|
|
} |
435 |
|
|
|
436 |
greg |
1.12 |
scanline = (COLR *)malloc(hresolu*sizeof(COLR)); |
437 |
greg |
1.1 |
if (scanline == NULL) |
438 |
|
|
error(SYSTEM, "out of memory in salvage"); |
439 |
greg |
1.12 |
for (y = 0; y < vresolu; y++) { |
440 |
|
|
if (freadcolrs(scanline, hresolu, fp) < 0) |
441 |
greg |
1.1 |
break; |
442 |
greg |
1.12 |
if (fwritecolrs(scanline, hresolu, stdout) < 0) |
443 |
greg |
1.1 |
goto writerr; |
444 |
|
|
} |
445 |
|
|
if (fflush(stdout) == EOF) |
446 |
|
|
goto writerr; |
447 |
|
|
free((char *)scanline); |
448 |
|
|
fclose(fp); |
449 |
|
|
unlink(oldfile); |
450 |
|
|
return(y); |
451 |
|
|
writerr: |
452 |
|
|
error(SYSTEM, "write error in salvage"); |
453 |
greg |
1.31 |
} |
454 |
|
|
|
455 |
|
|
|
456 |
|
|
int |
457 |
|
|
pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */ |
458 |
|
|
register int x, y; |
459 |
|
|
int xres, yres; |
460 |
|
|
{ |
461 |
|
|
x -= y; |
462 |
|
|
while (x < 0) |
463 |
|
|
x += xres; |
464 |
|
|
return((((x>>2)*yres + y) << 2) + (x & 3)); |
465 |
greg |
1.1 |
} |