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root/radiance/ray/src/hd/holo.h
Revision: 3.16
Committed: Thu Nov 5 09:09:32 1998 UTC (25 years, 4 months ago) by gwlarson
Content type: text/plain
Branch: MAIN
Changes since 3.15: +2 -2 lines
Log Message:
fixed hdflush() and hdclobber() macros

File Contents

# Content
1 /* Copyright (c) 1998 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
18 #define DCINF (unsigned)((1L<<16)-1) /* special value for infinity */
19 #define DCLIN (unsigned)(1L<<11) /* linear depth limit */
20
21 typedef struct {
22 BYTE r[2][2]; /* ray direction index */
23 COLR v; /* color value */
24 unsigned int2 d; /* depth code (from entry wall) */
25 } RAYVAL; /* ray value */
26
27 /*
28 * Walls are ordered: X0 X1 X2 WN
29 * 0 ? ? 0
30 * 1 ? ? 1
31 * ? 0 ? 2
32 * ? 1 ? 3
33 * ? ? 0 4
34 * ? ? 1 5
35 *
36 * Grid on wall WN corresponds to X(WN/2+1)%3 and X(WN/2+2)%3, resp.
37 */
38
39 typedef struct {
40 short w; /* wall number */
41 short i[2]; /* index on wall grid */
42 } GCOORD; /* grid coordinates (two for beam) */
43
44 typedef struct {
45 unsigned int4 nrd; /* number of beam rays bundled on disk */
46 long fo; /* position in file */
47 } BEAMI; /* beam index */
48
49 typedef struct {
50 unsigned int4 nrm; /* number of beam rays bundled in memory */
51 unsigned long tick; /* clock tick for LRU replacement */
52 } BEAM; /* followed by nrm RAYVAL's */
53
54 #define hdbray(bp) ((RAYVAL *)((bp)+1))
55 #define hdbsiz(nr) (sizeof(BEAM)+(nr)*sizeof(RAYVAL))
56
57 typedef struct {
58 FVECT orig; /* prism origin (first) */
59 FVECT xv[3]; /* side vectors (second) */
60 int2 grid[3]; /* grid resolution (third) */
61 } HDGRID; /* holodeck section grid (must match HOLO struct) */
62
63 typedef struct holo {
64 FVECT orig; /* prism origin (first) */
65 FVECT xv[3]; /* side vectors (second) */
66 int2 grid[3]; /* grid resolution (third) */
67 int fd; /* file descriptor */
68 short dirty; /* beam index needs update to file */
69 double tlin; /* linear range for depth encoding */
70 FVECT wg[3]; /* wall grid vectors (derived) */
71 double wo[6]; /* wall grid offsets (derived) */
72 int wi[6]; /* wall super-indices (derived) */
73 char *priv; /* pointer to private client data */
74 BEAM **bl; /* beam pointers (memory cache) */
75 BEAMI bi[1]; /* beam index (extends struct) */
76 } HOLO; /* holodeck section */
77
78 typedef struct {
79 HOLO *h; /* pointer to holodeck */
80 int b; /* beam index */
81 } HDBEAMI; /* holodeck beam index */
82
83 #define nbeams(hp) (((hp)->wi[5]-1)<<1)
84 #define biglob(hp) ((hp)->bi)
85 #define blglob(hp) (*(hp)->bl)
86
87 #define bnrays(hp,i) ((hp)->bl[i]!=NULL ? (hp)->bl[i]->nrm : (hp)->bi[i].nrd)
88
89 #define hdflush(hp) (hdfreebeam(hp,0), hdsync(hp,0))
90 #define hdclobber(hp) (hdkillbeam(hp,0), hdsync(hp,0))
91
92 extern HOLO *hdinit(), *hdalloc();
93 extern BEAM *hdgetbeam();
94 extern RAYVAL *hdnewrays();
95 extern unsigned hdmemuse();
96 extern long hdfiluse(), hdfilen(), hdallocfrag();
97 extern double hdray(), hdinter();
98 extern unsigned hdcode();
99 extern int hdfilord();
100
101 extern unsigned hdcachesize; /* target cache size (bytes) */
102 extern unsigned long hdclock; /* holodeck system clock */
103 extern HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */
104
105 extern float hd_depthmap[]; /* depth conversion map */
106
107 extern int hdwg0[6]; /* wall grid 0 index */
108 extern int hdwg1[6]; /* wall grid 1 index */
109
110 #define hddepth(hp,dc) ( (dc) >= DCINF ? FHUGE : \
111 (hp)->tlin * ( (dc) >= DCLIN ? \
112 hd_depthmap[(dc)-DCLIN] : \
113 ((dc)+.5)/DCLIN ) )
114
115 #define HOLOFMT "Holodeck" /* file format identifier */
116 #define HOLOVERS 0 /* file format version number */
117 #define HOLOMAGIC (323+sizeof(long)+8*HOLOVERS) /* file magic number */
118
119 /*
120 * A holodeck file consists of an information header terminated by a
121 * blank line, with "FORMAT=Holodeck" somewhere in it.
122 * The first integer after the information header is the
123 * above magic number, which includes the file format version number.
124 * The first longword after the magic number is a pointer to the pointer
125 * just before the SECOND holodeck section, or 0 if there is only one.
126 * This longword is immediately followed by the first holodeck
127 * section header and directory.
128 * Similarly, every holodeck section in the file is preceeded by
129 * a pointer to the following section, or 0 for the final section.
130 * Since holodeck files consist of directly written C data structures,
131 * they are not generally portable between different machine architectures.
132 * In particular, different floating point formats or bit/byte ordering
133 * will make the data unusable. This is unfortunate, and may be changed
134 * in future versions, but we thought this would be best for paging speed
135 * in our initial implementation.
136 */