1 |
gregl |
3.1 |
#ifndef lint |
2 |
greg |
3.17 |
static const char RCSid[] = "$Id: vwrays.c,v 3.16 2011/08/20 20:57:52 greg Exp $"; |
3 |
gregl |
3.1 |
#endif |
4 |
|
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/* |
5 |
|
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* Compute rays corresponding to a given picture or view. |
6 |
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*/ |
7 |
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8 |
greg |
3.9 |
#include "platform.h" |
9 |
gregl |
3.1 |
#include "standard.h" |
10 |
greg |
3.12 |
#include "random.h" |
11 |
gregl |
3.1 |
#include "view.h" |
12 |
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|
13 |
schorsch |
3.10 |
typedef void putfunc(FVECT ro, FVECT rd); |
14 |
|
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static putfunc puta; |
15 |
|
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static putfunc putf; |
16 |
|
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static putfunc putd; |
17 |
|
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static void pix2rays(FILE *fp); |
18 |
|
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static void putrays(void); |
19 |
gregl |
3.1 |
|
20 |
schorsch |
3.10 |
static putfunc *putr = puta; |
21 |
gregl |
3.1 |
|
22 |
|
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VIEW vw = STDVIEW; |
23 |
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|
24 |
|
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RESOLU rs = {PIXSTANDARD, 512, 512}; |
25 |
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|
26 |
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double pa = 1.; |
27 |
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|
28 |
greg |
3.12 |
double pj = 0.; |
29 |
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|
30 |
gregl |
3.1 |
int zfd = -1; |
31 |
|
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|
32 |
greg |
3.4 |
int fromstdin = 0; |
33 |
|
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|
34 |
greg |
3.16 |
int unbuffered = 0; |
35 |
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|
36 |
greg |
3.17 |
int repeatcnt = 1; |
37 |
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|
38 |
gregl |
3.1 |
char *progname; |
39 |
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|
40 |
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|
41 |
schorsch |
3.10 |
int |
42 |
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main( |
43 |
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int argc, |
44 |
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char *argv[] |
45 |
|
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) |
46 |
gregl |
3.1 |
{ |
47 |
|
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char *err; |
48 |
|
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int rval, getdim = 0; |
49 |
greg |
3.17 |
int i; |
50 |
gregl |
3.1 |
|
51 |
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progname = argv[0]; |
52 |
|
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if (argc < 2) |
53 |
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goto userr; |
54 |
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for (i = 1; i < argc && argv[i][0] == '-'; i++) |
55 |
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switch (argv[i][1]) { |
56 |
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case 'f': /* output format */ |
57 |
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switch (argv[i][2]) { |
58 |
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case 'a': /* ASCII */ |
59 |
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putr = puta; |
60 |
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break; |
61 |
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case 'f': /* float */ |
62 |
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putr = putf; |
63 |
greg |
3.13 |
SET_FILE_BINARY(stdout); |
64 |
gregl |
3.1 |
break; |
65 |
|
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case 'd': /* double */ |
66 |
|
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putr = putd; |
67 |
greg |
3.13 |
SET_FILE_BINARY(stdout); |
68 |
gregl |
3.1 |
break; |
69 |
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default: |
70 |
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goto userr; |
71 |
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} |
72 |
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break; |
73 |
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case 'v': /* view file or option */ |
74 |
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if (argv[i][2] == 'f') { |
75 |
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rval = viewfile(argv[++i], &vw, NULL); |
76 |
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if (rval <= 0) { |
77 |
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fprintf(stderr, |
78 |
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"%s: no view in file\n", |
79 |
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argv[i]); |
80 |
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exit(1); |
81 |
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} |
82 |
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break; |
83 |
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} |
84 |
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rval = getviewopt(&vw, argc-i, argv+i); |
85 |
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if (rval < 0) |
86 |
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goto userr; |
87 |
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i += rval; |
88 |
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break; |
89 |
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case 'd': /* report dimensions only */ |
90 |
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getdim++; |
91 |
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break; |
92 |
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case 'x': /* x resolution */ |
93 |
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rs.xr = atoi(argv[++i]); |
94 |
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if (rs.xr <= 0) { |
95 |
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fprintf(stderr, "%s: bad x resolution\n", |
96 |
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progname); |
97 |
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exit(1); |
98 |
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} |
99 |
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break; |
100 |
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case 'y': /* y resolution */ |
101 |
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rs.yr = atoi(argv[++i]); |
102 |
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if (rs.yr <= 0) { |
103 |
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fprintf(stderr, "%s: bad y resolution\n", |
104 |
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progname); |
105 |
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exit(1); |
106 |
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} |
107 |
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break; |
108 |
greg |
3.17 |
case 'c': /* repeat count */ |
109 |
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repeatcnt = atoi(argv[++i]); |
110 |
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break; |
111 |
greg |
3.12 |
case 'p': /* pixel aspect or jitter */ |
112 |
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if (argv[i][2] == 'a') |
113 |
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pa = atof(argv[++i]); |
114 |
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else if (argv[i][2] == 'j') |
115 |
greg |
3.15 |
pj = atof(argv[++i]); |
116 |
greg |
3.12 |
else |
117 |
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goto userr; |
118 |
gregl |
3.1 |
break; |
119 |
greg |
3.4 |
case 'i': /* get pixels from stdin */ |
120 |
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fromstdin = 1; |
121 |
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break; |
122 |
greg |
3.16 |
case 'u': /* unbuffered output */ |
123 |
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unbuffered = 1; |
124 |
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break; |
125 |
gregl |
3.1 |
default: |
126 |
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goto userr; |
127 |
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} |
128 |
schorsch |
3.7 |
if ((i > argc) | (i+2 < argc)) |
129 |
gregl |
3.1 |
goto userr; |
130 |
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if (i < argc) { |
131 |
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rval = viewfile(argv[i], &vw, &rs); |
132 |
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if (rval <= 0) { |
133 |
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fprintf(stderr, "%s: no view in picture\n", argv[i]); |
134 |
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exit(1); |
135 |
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} |
136 |
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if (i+1 < argc) { |
137 |
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zfd = open(argv[i+1], O_RDONLY); |
138 |
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if (zfd < 0) { |
139 |
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fprintf(stderr, |
140 |
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"%s: cannot open depth buffer\n", |
141 |
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argv[i+1]); |
142 |
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exit(1); |
143 |
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} |
144 |
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} |
145 |
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} |
146 |
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if ((err = setview(&vw)) != NULL) { |
147 |
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fprintf(stderr, "%s: %s\n", progname, err); |
148 |
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exit(1); |
149 |
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} |
150 |
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if (i == argc) |
151 |
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normaspect(viewaspect(&vw), &pa, &rs.xr, &rs.yr); |
152 |
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if (getdim) { |
153 |
gregl |
3.3 |
printf("-x %d -y %d -ld%c\n", rs.xr, rs.yr, |
154 |
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vw.vaft > FTINY ? '+' : '-'); |
155 |
gregl |
3.1 |
exit(0); |
156 |
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} |
157 |
greg |
3.4 |
if (fromstdin) |
158 |
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pix2rays(stdin); |
159 |
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else |
160 |
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putrays(); |
161 |
gregl |
3.1 |
exit(0); |
162 |
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userr: |
163 |
|
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fprintf(stderr, |
164 |
greg |
3.17 |
"Usage: %s [ -i -u -f{a|f|d} -c rept | -d ] { view opts .. | picture [zbuf] }\n", |
165 |
gregl |
3.1 |
progname); |
166 |
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exit(1); |
167 |
|
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} |
168 |
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169 |
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|
170 |
schorsch |
3.10 |
static void |
171 |
greg |
3.12 |
jitterloc( |
172 |
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RREAL loc[2] |
173 |
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) |
174 |
|
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{ |
175 |
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if (pj > FTINY) { |
176 |
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loc[0] += pj*(.5 - frandom())/rs.xr; |
177 |
|
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loc[1] += pj*(.5 - frandom())/rs.yr; |
178 |
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} |
179 |
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} |
180 |
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|
181 |
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|
182 |
|
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static void |
183 |
schorsch |
3.10 |
pix2rays( |
184 |
|
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FILE *fp |
185 |
|
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) |
186 |
greg |
3.4 |
{ |
187 |
|
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static FVECT rorg, rdir; |
188 |
|
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float zval; |
189 |
|
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double px, py; |
190 |
greg |
3.12 |
RREAL loc[2]; |
191 |
greg |
3.4 |
int pp[2]; |
192 |
|
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double d; |
193 |
greg |
3.17 |
int i; |
194 |
greg |
3.4 |
|
195 |
|
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while (fscanf(fp, "%lf %lf", &px, &py) == 2) { |
196 |
greg |
3.11 |
px += .5; py += .5; |
197 |
greg |
3.12 |
loc[0] = px/rs.xr; loc[1] = py/rs.yr; |
198 |
greg |
3.4 |
if (zfd >= 0) { |
199 |
greg |
3.12 |
loc2pix(pp, &rs, loc[0], loc[1]); |
200 |
greg |
3.4 |
if (lseek(zfd, |
201 |
greg |
3.8 |
(pp[1]*scanlen(&rs)+pp[0])*sizeof(float), |
202 |
|
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SEEK_SET) < 0 || |
203 |
greg |
3.4 |
read(zfd, &zval, sizeof(float)) |
204 |
greg |
3.8 |
< sizeof(float)) { |
205 |
greg |
3.4 |
fprintf(stderr, "%s: depth buffer read error\n", |
206 |
|
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progname); |
207 |
|
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exit(1); |
208 |
|
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} |
209 |
|
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} |
210 |
greg |
3.12 |
jitterloc(loc); |
211 |
|
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d = viewray(rorg, rdir, &vw, loc[0], loc[1]); |
212 |
greg |
3.4 |
if (d < -FTINY) |
213 |
|
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rorg[0] = rorg[1] = rorg[2] = |
214 |
|
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rdir[0] = rdir[1] = rdir[2] = 0.; |
215 |
|
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else if (zfd >= 0) |
216 |
|
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for (i = 0; i < 3; i++) { |
217 |
|
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rorg[i] += rdir[i]*zval; |
218 |
|
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rdir[i] = -rdir[i]; |
219 |
|
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} |
220 |
|
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else if (d > FTINY) { |
221 |
|
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rdir[0] *= d; rdir[1] *= d; rdir[2] *= d; |
222 |
|
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} |
223 |
|
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(*putr)(rorg, rdir); |
224 |
greg |
3.16 |
if (unbuffered) |
225 |
|
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fflush(stdout); |
226 |
greg |
3.4 |
} |
227 |
|
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if (!feof(fp)) { |
228 |
|
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fprintf(stderr, "%s: expected px py on input\n", progname); |
229 |
|
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exit(1); |
230 |
|
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} |
231 |
|
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} |
232 |
|
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|
233 |
|
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|
234 |
schorsch |
3.10 |
static void |
235 |
|
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putrays(void) |
236 |
gregl |
3.1 |
{ |
237 |
greg |
3.12 |
RREAL loc[2]; |
238 |
|
|
FVECT rorg, rdir; |
239 |
schorsch |
3.10 |
float *zbuf = NULL; |
240 |
gregl |
3.1 |
int sc; |
241 |
gregl |
3.2 |
double d; |
242 |
greg |
3.17 |
int si, i, c; |
243 |
gregl |
3.1 |
|
244 |
|
|
if (zfd >= 0) { |
245 |
|
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zbuf = (float *)malloc(scanlen(&rs)*sizeof(float)); |
246 |
|
|
if (zbuf == NULL) { |
247 |
|
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fprintf(stderr, "%s: not enough memory\n", progname); |
248 |
|
|
exit(1); |
249 |
|
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} |
250 |
|
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} |
251 |
|
|
for (sc = 0; sc < numscans(&rs); sc++) { |
252 |
|
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if (zfd >= 0) { |
253 |
|
|
if (read(zfd, zbuf, scanlen(&rs)*sizeof(float)) < |
254 |
|
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scanlen(&rs)*sizeof(float)) { |
255 |
|
|
fprintf(stderr, "%s: depth buffer read error\n", |
256 |
|
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progname); |
257 |
|
|
exit(1); |
258 |
|
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} |
259 |
|
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} |
260 |
|
|
for (si = 0; si < scanlen(&rs); si++) { |
261 |
greg |
3.17 |
for (c = repeatcnt; c-- > 0; ) { |
262 |
gregl |
3.1 |
pix2loc(loc, &rs, si, sc); |
263 |
greg |
3.12 |
jitterloc(loc); |
264 |
gregl |
3.2 |
d = viewray(rorg, rdir, &vw, loc[0], loc[1]); |
265 |
|
|
if (d < -FTINY) |
266 |
gregl |
3.1 |
rorg[0] = rorg[1] = rorg[2] = |
267 |
|
|
rdir[0] = rdir[1] = rdir[2] = 0.; |
268 |
|
|
else if (zfd >= 0) |
269 |
|
|
for (i = 0; i < 3; i++) { |
270 |
|
|
rorg[i] += rdir[i]*zbuf[si]; |
271 |
|
|
rdir[i] = -rdir[i]; |
272 |
|
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} |
273 |
gregl |
3.2 |
else if (d > FTINY) { |
274 |
|
|
rdir[0] *= d; rdir[1] *= d; rdir[2] *= d; |
275 |
|
|
} |
276 |
gregl |
3.1 |
(*putr)(rorg, rdir); |
277 |
greg |
3.17 |
} |
278 |
gregl |
3.1 |
} |
279 |
|
|
} |
280 |
|
|
if (zfd >= 0) |
281 |
greg |
3.4 |
free((void *)zbuf); |
282 |
gregl |
3.1 |
} |
283 |
|
|
|
284 |
|
|
|
285 |
schorsch |
3.10 |
static void |
286 |
|
|
puta( /* put out ray in ASCII format */ |
287 |
|
|
FVECT ro, |
288 |
|
|
FVECT rd |
289 |
|
|
) |
290 |
gregl |
3.1 |
{ |
291 |
|
|
printf("%.5e %.5e %.5e %.5e %.5e %.5e\n", |
292 |
|
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ro[0], ro[1], ro[2], |
293 |
|
|
rd[0], rd[1], rd[2]); |
294 |
|
|
} |
295 |
|
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|
296 |
|
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|
297 |
schorsch |
3.10 |
static void |
298 |
|
|
putf( /* put out ray in float format */ |
299 |
|
|
FVECT ro, |
300 |
|
|
FVECT rd |
301 |
|
|
) |
302 |
gregl |
3.1 |
{ |
303 |
|
|
float v[6]; |
304 |
|
|
|
305 |
|
|
v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2]; |
306 |
|
|
v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2]; |
307 |
|
|
fwrite(v, sizeof(float), 6, stdout); |
308 |
|
|
} |
309 |
|
|
|
310 |
|
|
|
311 |
schorsch |
3.10 |
static void |
312 |
|
|
putd( /* put out ray in double format */ |
313 |
|
|
FVECT ro, |
314 |
|
|
FVECT rd |
315 |
|
|
) |
316 |
gregl |
3.1 |
{ |
317 |
|
|
double v[6]; |
318 |
|
|
|
319 |
|
|
v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2]; |
320 |
|
|
v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2]; |
321 |
|
|
fwrite(v, sizeof(double), 6, stdout); |
322 |
|
|
} |