1 |
greg |
1.1 |
/* Copyright (c) 1986 Regents of the University of California */ |
2 |
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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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*/ |
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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 |
1.14 |
#else |
19 |
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#include <signal.h> |
20 |
greg |
1.1 |
#endif |
21 |
greg |
1.16 |
#include <sys/fcntl.h> |
22 |
greg |
1.1 |
|
23 |
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#include "view.h" |
24 |
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25 |
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#include "random.h" |
26 |
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27 |
greg |
1.12 |
VIEW ourview = STDVIEW; /* view parameters */ |
28 |
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int hresolu = 512; /* horizontal resolution */ |
29 |
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int vresolu = 512; /* vertical resolution */ |
30 |
greg |
1.13 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
31 |
greg |
1.1 |
|
32 |
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int psample = 4; /* pixel sample size */ |
33 |
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double maxdiff = .05; /* max. difference for interpolation */ |
34 |
greg |
1.3 |
double dstrpix = 0.67; /* square pixel distribution */ |
35 |
greg |
1.1 |
|
36 |
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double dstrsrc = 0.0; /* square source distribution */ |
37 |
greg |
1.4 |
double shadthresh = .05; /* shadow threshold */ |
38 |
greg |
1.5 |
double shadcert = .5; /* shadow certainty */ |
39 |
greg |
1.1 |
|
40 |
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int maxdepth = 6; /* maximum recursion depth */ |
41 |
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double minweight = 5e-3; /* minimum ray weight */ |
42 |
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43 |
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COLOR ambval = BLKCOLOR; /* ambient value */ |
44 |
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double ambacc = 0.2; /* ambient accuracy */ |
45 |
greg |
1.6 |
int ambres = 32; /* ambient resolution */ |
46 |
greg |
1.1 |
int ambdiv = 128; /* ambient divisions */ |
47 |
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int ambssamp = 0; /* ambient super-samples */ |
48 |
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int ambounce = 0; /* ambient bounces */ |
49 |
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char *amblist[128]; /* ambient include/exclude list */ |
50 |
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int ambincl = -1; /* include == 1, exclude == 0 */ |
51 |
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52 |
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int ralrm = 0; /* seconds between reports */ |
53 |
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54 |
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double pctdone = 0.0; /* percentage done */ |
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56 |
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extern long nrays; /* number of rays traced */ |
57 |
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58 |
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#define MAXDIV 32 /* maximum sample size */ |
59 |
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60 |
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#define pixjitter() (.5+dstrpix*(.5-frandom())) |
61 |
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62 |
greg |
1.11 |
double pixvalue(); |
63 |
greg |
1.1 |
|
64 |
greg |
1.11 |
|
65 |
greg |
1.1 |
quit(code) /* quit program */ |
66 |
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int code; |
67 |
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{ |
68 |
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if (code || ralrm > 0) /* report status */ |
69 |
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report(); |
70 |
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71 |
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exit(code); |
72 |
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} |
73 |
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74 |
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75 |
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report() /* report progress */ |
76 |
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{ |
77 |
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#ifdef BSD |
78 |
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struct rusage rubuf; |
79 |
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double t; |
80 |
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|
81 |
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getrusage(RUSAGE_SELF, &rubuf); |
82 |
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t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
83 |
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t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
84 |
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getrusage(RUSAGE_CHILDREN, &rubuf); |
85 |
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t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
86 |
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t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
87 |
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88 |
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sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n", |
89 |
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nrays, pctdone, t/3600.0); |
90 |
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#else |
91 |
greg |
1.14 |
signal(SIGALRM, report); |
92 |
greg |
1.1 |
sprintf(errmsg, "%ld rays, %4.2f%% done\n", nrays, pctdone); |
93 |
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#endif |
94 |
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eputs(errmsg); |
95 |
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96 |
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if (ralrm > 0) |
97 |
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alarm(ralrm); |
98 |
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} |
99 |
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100 |
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101 |
greg |
1.11 |
render(zfile, oldfile) /* render the scene */ |
102 |
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char *zfile, *oldfile; |
103 |
greg |
1.1 |
{ |
104 |
greg |
1.16 |
extern long lseek(); |
105 |
greg |
1.1 |
COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
106 |
greg |
1.11 |
float *zbar[MAXDIV+1]; /* z values */ |
107 |
greg |
1.1 |
int ypos; /* current scanline */ |
108 |
greg |
1.15 |
int ystep; /* current y step size */ |
109 |
greg |
1.16 |
int zfd; |
110 |
greg |
1.1 |
COLOR *colptr; |
111 |
greg |
1.11 |
float *zptr; |
112 |
greg |
1.1 |
register int i; |
113 |
greg |
1.10 |
/* check sampling */ |
114 |
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if (psample < 1) |
115 |
greg |
1.1 |
psample = 1; |
116 |
greg |
1.10 |
else if (psample > MAXDIV) |
117 |
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psample = MAXDIV; |
118 |
greg |
1.9 |
/* allocate scanlines */ |
119 |
greg |
1.1 |
for (i = 0; i <= psample; i++) { |
120 |
greg |
1.12 |
scanbar[i] = (COLOR *)malloc(hresolu*sizeof(COLOR)); |
121 |
greg |
1.1 |
if (scanbar[i] == NULL) |
122 |
greg |
1.11 |
goto memerr; |
123 |
greg |
1.1 |
} |
124 |
greg |
1.11 |
/* open z file */ |
125 |
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if (zfile != NULL) { |
126 |
greg |
1.16 |
if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) { |
127 |
greg |
1.11 |
sprintf(errmsg, "cannot open z file \"%s\"", zfile); |
128 |
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error(SYSTEM, errmsg); |
129 |
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} |
130 |
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for (i = 0; i <= psample; i++) { |
131 |
greg |
1.12 |
zbar[i] = (float *)malloc(hresolu*sizeof(float)); |
132 |
greg |
1.11 |
if (zbar[i] == NULL) |
133 |
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goto memerr; |
134 |
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} |
135 |
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} else { |
136 |
greg |
1.16 |
zfd = -1; |
137 |
greg |
1.11 |
for (i = 0; i <= psample; i++) |
138 |
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zbar[i] = NULL; |
139 |
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} |
140 |
greg |
1.1 |
/* write out boundaries */ |
141 |
greg |
1.12 |
fputresolu(YMAJOR|YDECR, hresolu, vresolu, stdout); |
142 |
greg |
1.10 |
/* recover file and compute first */ |
143 |
greg |
1.11 |
i = salvage(oldfile); |
144 |
greg |
1.16 |
if (zfd != -1 && lseek(zfd, (long)i*hresolu*sizeof(float), 0) == -1) |
145 |
greg |
1.11 |
error(SYSTEM, "z file seek error in render"); |
146 |
greg |
1.12 |
ypos = vresolu-1 - i; |
147 |
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fillscanline(scanbar[0], zbar[0], hresolu, ypos, psample); |
148 |
greg |
1.15 |
ystep = psample; |
149 |
greg |
1.10 |
/* compute scanlines */ |
150 |
greg |
1.15 |
for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
151 |
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/* record progress */ |
152 |
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pctdone = 100.0*(vresolu-ypos-ystep)/vresolu; |
153 |
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/* bottom adjust? */ |
154 |
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if (ypos < 0) { |
155 |
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ystep += ypos; |
156 |
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ypos = 0; |
157 |
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} |
158 |
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colptr = scanbar[ystep]; /* move base to top */ |
159 |
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scanbar[ystep] = scanbar[0]; |
160 |
greg |
1.1 |
scanbar[0] = colptr; |
161 |
greg |
1.15 |
zptr = zbar[ystep]; |
162 |
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zbar[ystep] = zbar[0]; |
163 |
greg |
1.11 |
zbar[0] = zptr; |
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greg |
1.10 |
/* fill base line */ |
165 |
greg |
1.12 |
fillscanline(scanbar[0], zbar[0], hresolu, ypos, psample); |
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greg |
1.10 |
/* fill bar */ |
167 |
greg |
1.15 |
fillscanbar(scanbar, zbar, hresolu, ypos, ystep); |
168 |
greg |
1.10 |
/* write it out */ |
169 |
greg |
1.15 |
for (i = ystep; i > 0; i--) { |
170 |
greg |
1.16 |
if (zfd!=-1 && write(zfd,zbar[i],hresolu*sizeof(float)) |
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< hresolu*sizeof(float)) |
172 |
greg |
1.1 |
goto writerr; |
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greg |
1.12 |
if (fwritescan(scanbar[i],hresolu,stdout) < 0) |
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greg |
1.11 |
goto writerr; |
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} |
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greg |
1.1 |
if (fflush(stdout) == EOF) |
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goto writerr; |
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} |
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greg |
1.11 |
/* clean up */ |
180 |
greg |
1.16 |
if (zfd != -1) { |
181 |
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if (write(zfd,zbar[0],hresolu*sizeof(float)) |
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< hresolu*sizeof(float)) |
183 |
greg |
1.11 |
goto writerr; |
184 |
greg |
1.16 |
close(zfd); |
185 |
greg |
1.11 |
for (i = 0; i <= psample; i++) |
186 |
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free((char *)zbar[i]); |
187 |
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} |
188 |
greg |
1.15 |
fwritescan(scanbar[0], hresolu, stdout); |
189 |
greg |
1.10 |
if (fflush(stdout) == EOF) |
190 |
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goto writerr; |
191 |
greg |
1.1 |
for (i = 0; i <= psample; i++) |
192 |
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free((char *)scanbar[i]); |
193 |
greg |
1.11 |
pctdone = 100.0; |
194 |
greg |
1.1 |
return; |
195 |
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writerr: |
196 |
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error(SYSTEM, "write error in render"); |
197 |
greg |
1.11 |
memerr: |
198 |
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error(SYSTEM, "out of memory in render"); |
199 |
greg |
1.1 |
} |
200 |
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201 |
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202 |
greg |
1.11 |
fillscanline(scanline, zline, xres, y, xstep) /* fill scan line at y */ |
203 |
greg |
1.1 |
register COLOR *scanline; |
204 |
greg |
1.11 |
register float *zline; |
205 |
greg |
1.9 |
int xres, y, xstep; |
206 |
greg |
1.1 |
{ |
207 |
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int b = xstep; |
208 |
greg |
1.11 |
double z; |
209 |
greg |
1.1 |
register int i; |
210 |
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211 |
greg |
1.11 |
z = pixvalue(scanline[0], 0, y); |
212 |
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if (zline) zline[0] = z; |
213 |
greg |
1.1 |
|
214 |
greg |
1.15 |
for (i = xstep; i < xres-1+xstep; i += xstep) { |
215 |
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if (i >= xres) { |
216 |
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xstep += xres-1-i; |
217 |
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i = xres-1; |
218 |
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} |
219 |
greg |
1.11 |
z = pixvalue(scanline[i], i, y); |
220 |
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if (zline) zline[i] = z; |
221 |
greg |
1.1 |
|
222 |
greg |
1.11 |
b = fillsample(scanline+i-xstep, zline ? zline+i-xstep : NULL, |
223 |
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i-xstep, y, xstep, 0, b/2); |
224 |
greg |
1.1 |
} |
225 |
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} |
226 |
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227 |
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228 |
greg |
1.11 |
fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */ |
229 |
greg |
1.1 |
register COLOR *scanbar[]; |
230 |
greg |
1.11 |
register float *zbar[]; |
231 |
greg |
1.9 |
int xres, y, ysize; |
232 |
greg |
1.1 |
{ |
233 |
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COLOR vline[MAXDIV+1]; |
234 |
greg |
1.11 |
float zline[MAXDIV+1]; |
235 |
greg |
1.1 |
int b = ysize; |
236 |
greg |
1.11 |
double z; |
237 |
greg |
1.1 |
register int i, j; |
238 |
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239 |
greg |
1.8 |
for (i = 0; i < xres; i++) { |
240 |
greg |
1.1 |
|
241 |
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copycolor(vline[0], scanbar[0][i]); |
242 |
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copycolor(vline[ysize], scanbar[ysize][i]); |
243 |
greg |
1.11 |
if (zbar[0]) { |
244 |
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zline[0] = zbar[0][i]; |
245 |
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zline[ysize] = zbar[ysize][i]; |
246 |
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} |
247 |
greg |
1.1 |
|
248 |
greg |
1.11 |
b = fillsample(vline, zbar[0] ? zline : NULL, |
249 |
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i, y, 0, ysize, b/2); |
250 |
greg |
1.1 |
|
251 |
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for (j = 1; j < ysize; j++) |
252 |
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copycolor(scanbar[j][i], vline[j]); |
253 |
greg |
1.11 |
if (zbar[0]) |
254 |
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for (j = 1; j < ysize; j++) |
255 |
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zbar[j][i] = zline[j]; |
256 |
greg |
1.1 |
} |
257 |
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} |
258 |
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259 |
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260 |
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int |
261 |
greg |
1.11 |
fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */ |
262 |
greg |
1.1 |
register COLOR *colline; |
263 |
greg |
1.11 |
register float *zline; |
264 |
greg |
1.1 |
int x, y; |
265 |
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int xlen, ylen; |
266 |
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int b; |
267 |
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{ |
268 |
greg |
1.11 |
extern double fabs(); |
269 |
greg |
1.1 |
double ratio; |
270 |
greg |
1.11 |
double z; |
271 |
greg |
1.1 |
COLOR ctmp; |
272 |
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int ncut; |
273 |
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register int len; |
274 |
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275 |
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if (xlen > 0) /* x or y length is zero */ |
276 |
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len = xlen; |
277 |
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else |
278 |
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len = ylen; |
279 |
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280 |
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if (len <= 1) /* limit recursion */ |
281 |
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return(0); |
282 |
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283 |
greg |
1.11 |
if (b > 0 |
284 |
|
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|| (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
285 |
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|| bigdiff(colline[0], colline[len], maxdiff)) { |
286 |
greg |
1.1 |
|
287 |
greg |
1.11 |
z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
288 |
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if (zline) zline[len>>1] = z; |
289 |
greg |
1.1 |
ncut = 1; |
290 |
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|
291 |
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} else { /* interpolate */ |
292 |
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293 |
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copycolor(colline[len>>1], colline[len]); |
294 |
|
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ratio = (double)(len>>1) / len; |
295 |
|
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scalecolor(colline[len>>1], ratio); |
296 |
greg |
1.11 |
if (zline) zline[len>>1] = zline[len] * ratio; |
297 |
|
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ratio = 1.0 - ratio; |
298 |
greg |
1.1 |
copycolor(ctmp, colline[0]); |
299 |
|
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scalecolor(ctmp, ratio); |
300 |
|
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addcolor(colline[len>>1], ctmp); |
301 |
greg |
1.11 |
if (zline) zline[len>>1] += zline[0] * ratio; |
302 |
greg |
1.1 |
ncut = 0; |
303 |
|
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} |
304 |
|
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/* recurse */ |
305 |
greg |
1.11 |
ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
306 |
greg |
1.1 |
|
307 |
greg |
1.11 |
ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL, |
308 |
|
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x+(xlen>>1), y+(ylen>>1), |
309 |
|
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xlen-(xlen>>1), ylen-(ylen>>1), b/2); |
310 |
greg |
1.1 |
|
311 |
|
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return(ncut); |
312 |
|
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} |
313 |
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314 |
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|
315 |
greg |
1.11 |
double |
316 |
greg |
1.1 |
pixvalue(col, x, y) /* compute pixel value */ |
317 |
|
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COLOR col; /* returned color */ |
318 |
|
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int x, y; /* pixel position */ |
319 |
|
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{ |
320 |
|
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static RAY thisray; /* our ray for this pixel */ |
321 |
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|
322 |
greg |
1.12 |
viewray(thisray.rorg, thisray.rdir, &ourview, |
323 |
|
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(x+pixjitter())/hresolu, (y+pixjitter())/vresolu); |
324 |
greg |
1.1 |
|
325 |
|
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
326 |
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|
327 |
|
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rayvalue(&thisray); /* trace ray */ |
328 |
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|
329 |
|
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copycolor(col, thisray.rcol); /* return color */ |
330 |
greg |
1.11 |
|
331 |
|
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return(thisray.rot); /* return distance */ |
332 |
greg |
1.1 |
} |
333 |
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|
334 |
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|
335 |
|
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int |
336 |
|
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salvage(oldfile) /* salvage scanlines from killed program */ |
337 |
|
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char *oldfile; |
338 |
|
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{ |
339 |
|
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COLR *scanline; |
340 |
|
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FILE *fp; |
341 |
|
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int x, y; |
342 |
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|
343 |
|
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if (oldfile == NULL) |
344 |
|
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return(0); |
345 |
greg |
1.9 |
|
346 |
|
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if ((fp = fopen(oldfile, "r")) == NULL) { |
347 |
greg |
1.1 |
sprintf(errmsg, "cannot open recover file \"%s\"", oldfile); |
348 |
|
|
error(WARNING, errmsg); |
349 |
|
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return(0); |
350 |
|
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} |
351 |
|
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/* discard header */ |
352 |
|
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getheader(fp, NULL); |
353 |
|
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/* get picture size */ |
354 |
greg |
1.7 |
if (fgetresolu(&x, &y, fp) != (YMAJOR|YDECR)) { |
355 |
greg |
1.2 |
sprintf(errmsg, "bad recover file \"%s\"", oldfile); |
356 |
|
|
error(WARNING, errmsg); |
357 |
greg |
1.1 |
fclose(fp); |
358 |
|
|
return(0); |
359 |
|
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} |
360 |
|
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|
361 |
greg |
1.12 |
if (x != hresolu || y != vresolu) { |
362 |
greg |
1.1 |
sprintf(errmsg, "resolution mismatch in recover file \"%s\"", |
363 |
|
|
oldfile); |
364 |
|
|
error(USER, errmsg); |
365 |
|
|
} |
366 |
|
|
|
367 |
greg |
1.12 |
scanline = (COLR *)malloc(hresolu*sizeof(COLR)); |
368 |
greg |
1.1 |
if (scanline == NULL) |
369 |
|
|
error(SYSTEM, "out of memory in salvage"); |
370 |
greg |
1.12 |
for (y = 0; y < vresolu; y++) { |
371 |
|
|
if (freadcolrs(scanline, hresolu, fp) < 0) |
372 |
greg |
1.1 |
break; |
373 |
greg |
1.12 |
if (fwritecolrs(scanline, hresolu, stdout) < 0) |
374 |
greg |
1.1 |
goto writerr; |
375 |
|
|
} |
376 |
|
|
if (fflush(stdout) == EOF) |
377 |
|
|
goto writerr; |
378 |
|
|
free((char *)scanline); |
379 |
|
|
fclose(fp); |
380 |
|
|
unlink(oldfile); |
381 |
|
|
return(y); |
382 |
|
|
writerr: |
383 |
|
|
error(SYSTEM, "write error in salvage"); |
384 |
|
|
} |