src/hd/holo.h

/* RCSid: $Id: holo.h,v 3.22 2003/06/20 00:25:49 greg Exp $ */
/*
 * Header file for holodeck programs
 *
 *      9/29/97 GWLarson
 */
#ifndef _RAD_HOLO_H_
#define _RAD_HOLO_H_

#include "standard.h"
#include "color.h"

#ifdef __cplusplus
extern "C" {
#endif

#ifndef HDMAX
#define HDMAX           128     /* maximum active holodeck sections */
#endif

#ifndef MAXDIRSE
#define MAXDIRSE        32      /* maximum seeks per directory write */
#endif

#define DCINF   (unsigned)((1L<<16)-1)  /* special value for infinity */
#define DCLIN   (unsigned)(1L<<11)      /* linear depth limit */

typedef struct {
        BYTE    r[2][2];        /* ray direction index */
        COLR    v;              /* color value */
        uint16  d;              /* depth code (from entry wall) */
} RAYVAL;               /* ray value */

/*
 * Walls are ordered:           X0      X1      X2      WN
 *                              0       ?       ?       0
 *                              1       ?       ?       1
 *                              ?       0       ?       2
 *                              ?       1       ?       3
 *                              ?       ?       0       4
 *                              ?       ?       1       5
 *
 * Grid on wall WN corresponds to X(WN/2+1)%3 and X(WN/2+2)%3, resp.
 */

typedef struct {
        short   w;              /* wall number */
        short   i[2];           /* index on wall grid */
} GCOORD;               /* grid coordinates (two for beam) */

typedef struct {
        uint32  nrd;            /* number of beam rays bundled on disk */
        off_t   fo;             /* position in file */
} BEAMI;                /* beam index */

typedef struct {
        uint32  nrm;            /* number of beam rays bundled in memory */
        unsigned long   tick;   /* clock tick for LRU replacement */
} BEAM;                 /* followed by nrm RAYVAL's */

#define hdbray(bp)      ((RAYVAL *)((bp)+1))
#define hdbsiz(nr)      (sizeof(BEAM)+(nr)*sizeof(RAYVAL))

typedef struct {
        FVECT   orig;           /* prism origin (first) */
        FVECT   xv[3];          /* side vectors (second) */
        int16   grid[3];        /* grid resolution (third) */
} HDGRID;               /* holodeck section grid (must match HOLO struct) */

typedef struct holo {
        FVECT   orig;           /* prism origin (first) */
        FVECT   xv[3];          /* side vectors (second) */
        int16   grid[3];        /* grid resolution (third) */
        int     fd;             /* file descriptor */
        struct {
                int     s, n;           /* dirty section start, length */
        } dirseg[MAXDIRSE+1];   /* dirty beam index segments */
        short   dirty;          /* number of dirty segments */
        double  tlin;           /* linear range for depth encoding */
        FVECT   wg[3];          /* wall grid vectors (derived) */
        int     wi[6];          /* wall super-indices (derived) */
        char    *priv;          /* pointer to private client data */
        BEAM    **bl;           /* beam pointers (memory cache) */
        BEAMI   bi[1];          /* beam index (extends struct) */
} HOLO;                 /* holodeck section */

typedef struct {
        HOLO    *h;             /* pointer to holodeck */
        int     b;              /* beam index */
} HDBEAMI;              /* holodeck beam index */

#define nbeams(hp)      (((hp)->wi[5]-1)<<1)
#define biglob(hp)      ((hp)->bi)
#define blglob(hp)      (*(hp)->bl)

#define bnrays(hp,i)    ((hp)->bl[i]!=NULL ? (hp)->bl[i]->nrm : (hp)->bi[i].nrd)

#define hdflush(hp)     (hdfreebeam(hp,0), hdsync(hp,0))
#define hdclobber(hp)   (hdkillbeam(hp,0), hdsync(hp,0))

extern HOLO     *hdinit(), *hdalloc();
extern BEAM     *hdgetbeam();
extern RAYVAL   *hdnewrays();
extern unsigned hdmemuse();
extern off_t    hdfiluse(), hdfilen(), hdallocfrag();
extern double   hdray(), hdinter();
extern unsigned hdcode();
extern int      hdfilord();

#define FF_NEVER        0               /* never free fragments */
#define FF_WRITE        01              /* free fragment on write */
#define FF_ALLOC        02              /* free fragment on ray alloc */
#define FF_READ         04              /* free fragment on read */
#define FF_KILL         010             /* free fragment on beam kill */

extern int      hdfragflags;            /* tells when to free fragments */
extern unsigned hdcachesize;            /* target cache size (bytes) */
extern unsigned long    hdclock;        /* holodeck system clock */
extern HOLO     *hdlist[HDMAX+1];       /* holodeck pointers (NULL term.) */

extern float    hd_depthmap[];          /* depth conversion map */

extern int      hdwg0[6];               /* wall grid 0 index */
extern int      hdwg1[6];               /* wall grid 1 index */

#define hddepth(hp,dc)  ( (dc) >= DCINF ? FHUGE : \
                                (hp)->tlin * ( (dc) >= DCLIN ? \
                                        hd_depthmap[(dc)-DCLIN] : \
                                        ((dc)+.5)/DCLIN ) )

#define HOLOFMT         "Holodeck"      /* file format identifier */
#define HOLOVERS        0               /* file format version number */
#define HOLOMAGIC       (323+sizeof(off_t)+8*HOLOVERS)  /* file magic number */

/*
 * A holodeck file consists of an information header terminated by a
 * blank line, with "FORMAT=Holodeck" somewhere in it.
 * The first integer after the information header is the
 * above magic number, which includes the file format version number.
 * The first longword after the magic number is a pointer to the pointer
 * just before the SECOND holodeck section, or 0 if there is only one.
 * This longword is immediately followed by the first holodeck
 * section header and directory.
 * Similarly, every holodeck section in the file is preceeded by
 * a pointer to the following section, or 0 for the final section.
 * Since holodeck files consist of directly written C data structures, 
 * they are not generally portable between different machine architectures.
 * In particular, different floating point formats or bit/byte ordering
 * will make the data unusable.  This is unfortunate, and may be changed
 * in future versions, but we thought this would be best for paging speed
 * in our initial implementation.
 */


#ifdef __cplusplus
}
#endif
#endif /* _RAD_HOLO_H_ */

Revision:	3.23
Committed:	Mon Jul 14 22:24:00 2003 UTC (22 years, 3 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 3.22:	+14 -1 lines
Log Message:	Instrumented headers against multiple inclusion and for use from C++. Moved includes in headers out of "C" scope.
#	User	Rev	Content
1	schorsch	3.23	/* RCSid: $Id: holo.h,v 3.22 2003/06/20 00:25:49 greg Exp $ */
2	gregl	3.1	/*
3			* Header file for holodeck programs
4			*
5			* 9/29/97 GWLarson
6			*/
7	schorsch	3.23	#ifndef _RAD_HOLO_H_
8			#define _RAD_HOLO_H_
9	gregl	3.1
10			#include "standard.h"
11			#include "color.h"
12
13	schorsch	3.23	#ifdef __cplusplus
14			extern "C" {
15			#endif
16
17	gregl	3.1	#ifndef HDMAX
18			#define HDMAX 128 /* maximum active holodeck sections */
19			#endif
20
21	gwlarson	3.17	#ifndef MAXDIRSE
22			#define MAXDIRSE 32 /* maximum seeks per directory write */
23			#endif
24
25	gregl	3.1	#define DCINF (unsigned)((1L<<16)-1) /* special value for infinity */
26			#define DCLIN (unsigned)(1L<<11) /* linear depth limit */
27
28			typedef struct {
29			BYTE r[2][2]; /* ray direction index */
30	gwlarson	3.15	COLR v; /* color value */
31	greg	3.22	uint16 d; /* depth code (from entry wall) */
32	gwlarson	3.15	} RAYVAL; /* ray value */
33	gregl	3.1
34			/*
35			* Walls are ordered: X0 X1 X2 WN
36			* 0 ? ? 0
37			* 1 ? ? 1
38			* ? 0 ? 2
39			* ? 1 ? 3
40			* ? ? 0 4
41			* ? ? 1 5
42			*
43			* Grid on wall WN corresponds to X(WN/2+1)%3 and X(WN/2+2)%3, resp.
44			*/
45
46			typedef struct {
47			short w; /* wall number */
48			short i[2]; /* index on wall grid */
49	gregl	3.2	} GCOORD; /* grid coordinates (two for beam) */
50	gregl	3.1
51			typedef struct {
52	greg	3.22	uint32 nrd; /* number of beam rays bundled on disk */
53	greg	3.21	off_t fo; /* position in file */
54	gregl	3.1	} BEAMI; /* beam index */
55
56			typedef struct {
57	greg	3.22	uint32 nrm; /* number of beam rays bundled in memory */
58	gregl	3.1	unsigned long tick; /* clock tick for LRU replacement */
59			} BEAM; /* followed by nrm RAYVAL's */
60
61	gregl	3.3	#define hdbray(bp) ((RAYVAL *)((bp)+1))
62	gregl	3.1	#define hdbsiz(nr) (sizeof(BEAM)+(nr)*sizeof(RAYVAL))
63
64			typedef struct {
65			FVECT orig; /* prism origin (first) */
66			FVECT xv[3]; /* side vectors (second) */
67	greg	3.22	int16 grid[3]; /* grid resolution (third) */
68	gregl	3.1	} HDGRID; /* holodeck section grid (must match HOLO struct) */
69
70			typedef struct holo {
71			FVECT orig; /* prism origin (first) */
72			FVECT xv[3]; /* side vectors (second) */
73	greg	3.22	int16 grid[3]; /* grid resolution (third) */
74	gregl	3.1	int fd; /* file descriptor */
75	gwlarson	3.17	struct {
76			int s, n; /* dirty section start, length */
77			} dirseg[MAXDIRSE+1]; /* dirty beam index segments */
78			short dirty; /* number of dirty segments */
79	gregl	3.1	double tlin; /* linear range for depth encoding */
80	gregl	3.13	FVECT wg[3]; /* wall grid vectors (derived) */
81	gregl	3.1	int wi[6]; /* wall super-indices (derived) */
82			char priv; / pointer to private client data */
83			BEAM *bl; / beam pointers (memory cache) */
84			BEAMI bi[1]; /* beam index (extends struct) */
85			} HOLO; /* holodeck section */
86
87	gregl	3.9	typedef struct {
88			HOLO h; / pointer to holodeck */
89			int b; /* beam index */
90			} HDBEAMI; /* holodeck beam index */
91
92	gregl	3.14	#define nbeams(hp) (((hp)->wi[5]-1)<<1)
93	gregl	3.1	#define biglob(hp) ((hp)->bi)
94			#define blglob(hp) (*(hp)->bl)
95
96			#define bnrays(hp,i) ((hp)->bl[i]!=NULL ? (hp)->bl[i]->nrm : (hp)->bi[i].nrd)
97
98	gwlarson	3.16	#define hdflush(hp) (hdfreebeam(hp,0), hdsync(hp,0))
99			#define hdclobber(hp) (hdkillbeam(hp,0), hdsync(hp,0))
100	gregl	3.1
101	gregl	3.4	extern HOLO hdinit(), hdalloc();
102	gregl	3.1	extern BEAM *hdgetbeam();
103			extern RAYVAL *hdnewrays();
104	gregl	3.9	extern unsigned hdmemuse();
105	greg	3.21	extern off_t hdfiluse(), hdfilen(), hdallocfrag();
106	gregl	3.1	extern double hdray(), hdinter();
107			extern unsigned hdcode();
108	gregl	3.14	extern int hdfilord();
109	gregl	3.1
110	gwlarson	3.19	#define FF_NEVER 0 /* never free fragments */
111			#define FF_WRITE 01 /* free fragment on write */
112			#define FF_ALLOC 02 /* free fragment on ray alloc */
113			#define FF_READ 04 /* free fragment on read */
114			#define FF_KILL 010 /* free fragment on beam kill */
115
116			extern int hdfragflags; /* tells when to free fragments */
117	gregl	3.9	extern unsigned hdcachesize; /* target cache size (bytes) */
118	gregl	3.1	extern unsigned long hdclock; /* holodeck system clock */
119			extern HOLO hdlist[HDMAX+1]; / holodeck pointers (NULL term.) */
120
121			extern float hd_depthmap[]; /* depth conversion map */
122	gregl	3.13
123			extern int hdwg0[6]; /* wall grid 0 index */
124			extern int hdwg1[6]; /* wall grid 1 index */
125	gregl	3.1
126			#define hddepth(hp,dc) ( (dc) >= DCINF ? FHUGE : \
127			(hp)->tlin * ( (dc) >= DCLIN ? \
128			hd_depthmap[(dc)-DCLIN] : \
129			((dc)+.5)/DCLIN ) )
130
131			#define HOLOFMT "Holodeck" /* file format identifier */
132			#define HOLOVERS 0 /* file format version number */
133	greg	3.21	#define HOLOMAGIC (323+sizeof(off_t)+8HOLOVERS) / file magic number */
134	gregl	3.1
135			/*
136			* A holodeck file consists of an information header terminated by a
137			* blank line, with "FORMAT=Holodeck" somewhere in it.
138			* The first integer after the information header is the
139			* above magic number, which includes the file format version number.
140	gregl	3.6	* The first longword after the magic number is a pointer to the pointer
141			* just before the SECOND holodeck section, or 0 if there is only one.
142	gregl	3.1	* This longword is immediately followed by the first holodeck
143			* section header and directory.
144			* Similarly, every holodeck section in the file is preceeded by
145			* a pointer to the following section, or 0 for the final section.
146			* Since holodeck files consist of directly written C data structures,
147			* they are not generally portable between different machine architectures.
148			* In particular, different floating point formats or bit/byte ordering
149			* will make the data unusable. This is unfortunate, and may be changed
150			* in future versions, but we thought this would be best for paging speed
151			* in our initial implementation.
152			*/
153	schorsch	3.23
154
155			#ifdef __cplusplus
156			}
157			#endif
158			#endif /* _RAD_HOLO_H_ */
159