1 |
gregl |
3.1 |
#ifndef lint |
2 |
schorsch |
3.10 |
static const char RCSid[] = "$Id: vwrays.c,v 3.9 2003/10/22 02:06:35 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 |
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#include "view.h" |
11 |
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12 |
schorsch |
3.10 |
typedef void putfunc(FVECT ro, FVECT rd); |
13 |
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static putfunc puta; |
14 |
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static putfunc putf; |
15 |
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static putfunc putd; |
16 |
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static void pix2rays(FILE *fp); |
17 |
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static void putrays(void); |
18 |
gregl |
3.1 |
|
19 |
schorsch |
3.10 |
static putfunc *putr = puta; |
20 |
gregl |
3.1 |
|
21 |
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VIEW vw = STDVIEW; |
22 |
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23 |
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RESOLU rs = {PIXSTANDARD, 512, 512}; |
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25 |
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double pa = 1.; |
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27 |
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int zfd = -1; |
28 |
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29 |
greg |
3.4 |
int fromstdin = 0; |
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31 |
gregl |
3.1 |
char *progname; |
32 |
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33 |
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34 |
schorsch |
3.10 |
int |
35 |
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main( |
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int argc, |
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char *argv[] |
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) |
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gregl |
3.1 |
{ |
40 |
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char *err; |
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int rval, getdim = 0; |
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register int i; |
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44 |
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progname = argv[0]; |
45 |
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if (argc < 2) |
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goto userr; |
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for (i = 1; i < argc && argv[i][0] == '-'; i++) |
48 |
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switch (argv[i][1]) { |
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case 'f': /* output format */ |
50 |
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switch (argv[i][2]) { |
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case 'a': /* ASCII */ |
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putr = puta; |
53 |
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break; |
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case 'f': /* float */ |
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putr = putf; |
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break; |
57 |
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case 'd': /* double */ |
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putr = putd; |
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break; |
60 |
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default: |
61 |
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goto userr; |
62 |
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} |
63 |
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break; |
64 |
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case 'v': /* view file or option */ |
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if (argv[i][2] == 'f') { |
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rval = viewfile(argv[++i], &vw, NULL); |
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if (rval <= 0) { |
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fprintf(stderr, |
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"%s: no view in file\n", |
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argv[i]); |
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exit(1); |
72 |
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} |
73 |
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break; |
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} |
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rval = getviewopt(&vw, argc-i, argv+i); |
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if (rval < 0) |
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goto userr; |
78 |
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i += rval; |
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break; |
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case 'd': /* report dimensions only */ |
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getdim++; |
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break; |
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case 'x': /* x resolution */ |
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rs.xr = atoi(argv[++i]); |
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if (rs.xr <= 0) { |
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fprintf(stderr, "%s: bad x resolution\n", |
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progname); |
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exit(1); |
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} |
90 |
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break; |
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case 'y': /* y resolution */ |
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rs.yr = atoi(argv[++i]); |
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if (rs.yr <= 0) { |
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fprintf(stderr, "%s: bad y resolution\n", |
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progname); |
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exit(1); |
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} |
98 |
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break; |
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case 'p': /* pixel aspect ratio */ |
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pa = atof(argv[++i]); |
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break; |
102 |
greg |
3.4 |
case 'i': /* get pixels from stdin */ |
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fromstdin = 1; |
104 |
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break; |
105 |
gregl |
3.1 |
default: |
106 |
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goto userr; |
107 |
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} |
108 |
schorsch |
3.7 |
if ((i > argc) | (i+2 < argc)) |
109 |
gregl |
3.1 |
goto userr; |
110 |
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if (i < argc) { |
111 |
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rval = viewfile(argv[i], &vw, &rs); |
112 |
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if (rval <= 0) { |
113 |
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fprintf(stderr, "%s: no view in picture\n", argv[i]); |
114 |
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exit(1); |
115 |
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} |
116 |
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if (i+1 < argc) { |
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zfd = open(argv[i+1], O_RDONLY); |
118 |
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if (zfd < 0) { |
119 |
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fprintf(stderr, |
120 |
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"%s: cannot open depth buffer\n", |
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argv[i+1]); |
122 |
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exit(1); |
123 |
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} |
124 |
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} |
125 |
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} |
126 |
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if ((err = setview(&vw)) != NULL) { |
127 |
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fprintf(stderr, "%s: %s\n", progname, err); |
128 |
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exit(1); |
129 |
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} |
130 |
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if (i == argc) |
131 |
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normaspect(viewaspect(&vw), &pa, &rs.xr, &rs.yr); |
132 |
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if (getdim) { |
133 |
gregl |
3.3 |
printf("-x %d -y %d -ld%c\n", rs.xr, rs.yr, |
134 |
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vw.vaft > FTINY ? '+' : '-'); |
135 |
gregl |
3.1 |
exit(0); |
136 |
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} |
137 |
greg |
3.4 |
if (fromstdin) |
138 |
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pix2rays(stdin); |
139 |
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else |
140 |
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putrays(); |
141 |
gregl |
3.1 |
exit(0); |
142 |
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userr: |
143 |
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fprintf(stderr, |
144 |
greg |
3.4 |
"Usage: %s [ -i -f{a|f|d} | -d ] { view opts .. | picture [zbuf] }\n", |
145 |
gregl |
3.1 |
progname); |
146 |
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exit(1); |
147 |
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} |
148 |
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149 |
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150 |
schorsch |
3.10 |
static void |
151 |
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pix2rays( |
152 |
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FILE *fp |
153 |
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) |
154 |
greg |
3.4 |
{ |
155 |
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static FVECT rorg, rdir; |
156 |
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float zval; |
157 |
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double px, py; |
158 |
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int pp[2]; |
159 |
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double d; |
160 |
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register int i; |
161 |
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162 |
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while (fscanf(fp, "%lf %lf", &px, &py) == 2) { |
163 |
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if (px < 0 || px >= rs.xr || |
164 |
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py < 0 || py >= rs.yr) { |
165 |
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fprintf(stderr, |
166 |
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"%s: (x,y) pair (%.0f,%.0f) out of range\n", |
167 |
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progname, px, py); |
168 |
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exit(1); |
169 |
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} |
170 |
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if (zfd >= 0) { |
171 |
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loc2pix(pp, &rs, px/rs.xr, py/rs.yr); |
172 |
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if (lseek(zfd, |
173 |
greg |
3.8 |
(pp[1]*scanlen(&rs)+pp[0])*sizeof(float), |
174 |
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SEEK_SET) < 0 || |
175 |
greg |
3.4 |
read(zfd, &zval, sizeof(float)) |
176 |
greg |
3.8 |
< sizeof(float)) { |
177 |
greg |
3.4 |
fprintf(stderr, "%s: depth buffer read error\n", |
178 |
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progname); |
179 |
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exit(1); |
180 |
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} |
181 |
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} |
182 |
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d = viewray(rorg, rdir, &vw, px/rs.xr, py/rs.yr); |
183 |
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if (d < -FTINY) |
184 |
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rorg[0] = rorg[1] = rorg[2] = |
185 |
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rdir[0] = rdir[1] = rdir[2] = 0.; |
186 |
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else if (zfd >= 0) |
187 |
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for (i = 0; i < 3; i++) { |
188 |
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rorg[i] += rdir[i]*zval; |
189 |
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rdir[i] = -rdir[i]; |
190 |
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} |
191 |
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else if (d > FTINY) { |
192 |
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rdir[0] *= d; rdir[1] *= d; rdir[2] *= d; |
193 |
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} |
194 |
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(*putr)(rorg, rdir); |
195 |
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} |
196 |
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if (!feof(fp)) { |
197 |
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fprintf(stderr, "%s: expected px py on input\n", progname); |
198 |
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exit(1); |
199 |
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} |
200 |
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} |
201 |
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202 |
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203 |
schorsch |
3.10 |
static void |
204 |
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putrays(void) |
205 |
gregl |
3.1 |
{ |
206 |
schorsch |
3.5 |
static RREAL loc[2]; |
207 |
gregl |
3.2 |
static FVECT rorg, rdir; |
208 |
schorsch |
3.10 |
float *zbuf = NULL; |
209 |
gregl |
3.1 |
int sc; |
210 |
gregl |
3.2 |
double d; |
211 |
gregl |
3.1 |
register int si, i; |
212 |
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213 |
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if (zfd >= 0) { |
214 |
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zbuf = (float *)malloc(scanlen(&rs)*sizeof(float)); |
215 |
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if (zbuf == NULL) { |
216 |
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fprintf(stderr, "%s: not enough memory\n", progname); |
217 |
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exit(1); |
218 |
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} |
219 |
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} |
220 |
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for (sc = 0; sc < numscans(&rs); sc++) { |
221 |
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if (zfd >= 0) { |
222 |
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if (read(zfd, zbuf, scanlen(&rs)*sizeof(float)) < |
223 |
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scanlen(&rs)*sizeof(float)) { |
224 |
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fprintf(stderr, "%s: depth buffer read error\n", |
225 |
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progname); |
226 |
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exit(1); |
227 |
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} |
228 |
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} |
229 |
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for (si = 0; si < scanlen(&rs); si++) { |
230 |
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pix2loc(loc, &rs, si, sc); |
231 |
gregl |
3.2 |
d = viewray(rorg, rdir, &vw, loc[0], loc[1]); |
232 |
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if (d < -FTINY) |
233 |
gregl |
3.1 |
rorg[0] = rorg[1] = rorg[2] = |
234 |
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rdir[0] = rdir[1] = rdir[2] = 0.; |
235 |
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else if (zfd >= 0) |
236 |
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for (i = 0; i < 3; i++) { |
237 |
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rorg[i] += rdir[i]*zbuf[si]; |
238 |
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rdir[i] = -rdir[i]; |
239 |
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} |
240 |
gregl |
3.2 |
else if (d > FTINY) { |
241 |
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rdir[0] *= d; rdir[1] *= d; rdir[2] *= d; |
242 |
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} |
243 |
gregl |
3.1 |
(*putr)(rorg, rdir); |
244 |
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} |
245 |
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} |
246 |
|
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if (zfd >= 0) |
247 |
greg |
3.4 |
free((void *)zbuf); |
248 |
gregl |
3.1 |
} |
249 |
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|
250 |
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|
251 |
schorsch |
3.10 |
static void |
252 |
|
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puta( /* put out ray in ASCII format */ |
253 |
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FVECT ro, |
254 |
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FVECT rd |
255 |
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) |
256 |
gregl |
3.1 |
{ |
257 |
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printf("%.5e %.5e %.5e %.5e %.5e %.5e\n", |
258 |
|
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ro[0], ro[1], ro[2], |
259 |
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rd[0], rd[1], rd[2]); |
260 |
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} |
261 |
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262 |
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263 |
schorsch |
3.10 |
static void |
264 |
|
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putf( /* put out ray in float format */ |
265 |
|
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FVECT ro, |
266 |
|
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FVECT rd |
267 |
|
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) |
268 |
gregl |
3.1 |
{ |
269 |
|
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float v[6]; |
270 |
|
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|
271 |
|
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v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2]; |
272 |
|
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v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2]; |
273 |
|
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fwrite(v, sizeof(float), 6, stdout); |
274 |
|
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} |
275 |
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|
276 |
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|
277 |
schorsch |
3.10 |
static void |
278 |
|
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putd( /* put out ray in double format */ |
279 |
|
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FVECT ro, |
280 |
|
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FVECT rd |
281 |
|
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) |
282 |
gregl |
3.1 |
{ |
283 |
|
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double v[6]; |
284 |
|
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|
285 |
|
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v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2]; |
286 |
|
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v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2]; |
287 |
|
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fwrite(v, sizeof(double), 6, stdout); |
288 |
|
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} |