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root/radiance/ray/src/hd/holo.h
Revision: 3.2
Committed: Thu Nov 6 16:37:45 1997 UTC (26 years, 4 months ago) by gregl
Content type: text/plain
Branch: MAIN
Changes since 3.1: +1 -1 lines
Log Message:
changed BCOORD to GCOORD[2]

File Contents

# Content
1 /* Copyright (c) 1997 Silicon Graphics, Inc. */
2
3 /* SCCSid "$SunId$ SGI" */
4
5 /*
6 * Header file for holodeck programs
7 *
8 * 9/29/97 GWLarson
9 */
10
11 #include "standard.h"
12 #include "color.h"
13
14 #ifndef HDMAX
15 #define HDMAX 128 /* maximum active holodeck sections */
16 #endif
17 #ifndef int2
18 #define int2 short
19 #endif
20 #ifndef int4
21 #define int4 long
22 #endif
23
24 #define DCINF (unsigned)((1L<<16)-1) /* special value for infinity */
25 #define DCLIN (unsigned)(1L<<11) /* linear depth limit */
26
27 typedef struct {
28 BYTE r[2][2]; /* ray direction index */
29 COLR v; /* value */
30 unsigned int2 d; /* depth code */
31 } RAYVAL; /* ray value (from second wall) */
32
33 /*
34 * Walls are ordered: X0 X1 X2 WN
35 * 0 ? ? 0
36 * 1 ? ? 1
37 * ? 0 ? 2
38 * ? 1 ? 3
39 * ? ? 0 4
40 * ? ? 1 5
41 *
42 * Grid on wall WN corresponds to X(WN/2+1)%3 and X(WN/2+2)%3, resp.
43 */
44
45 typedef struct {
46 short w; /* wall number */
47 short i[2]; /* index on wall grid */
48 } GCOORD; /* grid coordinates (two for beam) */
49
50 typedef struct {
51 unsigned int4 nrd; /* number of beam rays bundled on disk */
52 long fo; /* position in file */
53 } BEAMI; /* beam index */
54
55 typedef struct {
56 unsigned int4 nrm; /* number of beam rays bundled in memory */
57 unsigned long tick; /* clock tick for LRU replacement */
58 } BEAM; /* followed by nrm RAYVAL's */
59
60 #define hdbray(bp) (RAYVAL *)((bp)+1)
61 #define hdbsiz(nr) (sizeof(BEAM)+(nr)*sizeof(RAYVAL))
62
63 typedef struct {
64 FVECT orig; /* prism origin (first) */
65 FVECT xv[3]; /* side vectors (second) */
66 int2 grid[3]; /* grid resolution (third) */
67 } HDGRID; /* holodeck section grid (must match HOLO struct) */
68
69 typedef struct holo {
70 FVECT orig; /* prism origin (first) */
71 FVECT xv[3]; /* side vectors (second) */
72 int2 grid[3]; /* grid resolution (third) */
73 int fd; /* file descriptor */
74 short dirty; /* beam index needs update to file */
75 double tlin; /* linear range for depth encoding */
76 FVECT wn[3]; /* wall normals (derived) */
77 double wo[6]; /* wall offsets (derived) */
78 FVECT gv[3][2]; /* grid coordinate vectors (derived) */
79 int wi[6]; /* wall super-indices (derived) */
80 char *priv; /* pointer to private client data */
81 BEAM **bl; /* beam pointers (memory cache) */
82 BEAMI bi[1]; /* beam index (extends struct) */
83 } HOLO; /* holodeck section */
84
85 #define nbeams(hp) (2*((hp)->wi[5]-1))
86 #define biglob(hp) ((hp)->bi)
87 #define blglob(hp) (*(hp)->bl)
88
89 #define bnrays(hp,i) ((hp)->bl[i]!=NULL ? (hp)->bl[i]->nrm : (hp)->bi[i].nrd)
90
91 #define hdflush(hp) (hdfreebeam(hp,0) && hdsync(hp))
92
93 extern HOLO *hdinit();
94 extern BEAM *hdgetbeam();
95 extern RAYVAL *hdnewrays();
96 extern long hdmemuse(), hdfiluse();
97 extern double hdray(), hdinter();
98 extern unsigned hdcode();
99
100 extern int hdcachesize; /* target cache size (bytes) */
101 extern unsigned long hdclock; /* holodeck system clock */
102 extern HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */
103
104 extern float hd_depthmap[]; /* depth conversion map */
105
106 #define hddepth(hp,dc) ( (dc) >= DCINF ? FHUGE : \
107 (hp)->tlin * ( (dc) >= DCLIN ? \
108 hd_depthmap[(dc)-DCLIN] : \
109 ((dc)+.5)/DCLIN ) )
110
111 #define HOLOFMT "Holodeck" /* file format identifier */
112 #define HOLOVERS 0 /* file format version number */
113 #define HOLOMAGIC (327+HOLOVERS) /* file magic number */
114
115 /*
116 * A holodeck file consists of an information header terminated by a
117 * blank line, with "FORMAT=Holodeck" somewhere in it.
118 * The first integer after the information header is the
119 * above magic number, which includes the file format version number.
120 * The first longword after the magic number is the position
121 * of the SECOND holodeck section, or 0 if there is only one.
122 * This longword is immediately followed by the first holodeck
123 * section header and directory.
124 * Similarly, every holodeck section in the file is preceeded by
125 * a pointer to the following section, or 0 for the final section.
126 * Since holodeck files consist of directly written C data structures,
127 * they are not generally portable between different machine architectures.
128 * In particular, different floating point formats or bit/byte ordering
129 * will make the data unusable. This is unfortunate, and may be changed
130 * in future versions, but we thought this would be best for paging speed
131 * in our initial implementation.
132 */