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gregl |
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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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/* SCCSid "$SunId$ SGI" */ |
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/* |
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* Header file for holodeck programs |
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* |
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* 9/29/97 GWLarson |
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*/ |
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#include "standard.h" |
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#include "color.h" |
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#ifndef HDMAX |
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#define HDMAX 128 /* maximum active holodeck sections */ |
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#endif |
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#ifndef int2 |
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#define int2 short |
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#endif |
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#ifndef int4 |
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#define int4 long |
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#endif |
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#define DCINF (unsigned)((1L<<16)-1) /* special value for infinity */ |
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#define DCLIN (unsigned)(1L<<11) /* linear depth limit */ |
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typedef struct { |
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BYTE r[2][2]; /* ray direction index */ |
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COLR v; /* value */ |
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unsigned int2 d; /* depth code */ |
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} RAYVAL; /* ray value (from second wall) */ |
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/* |
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* Walls are ordered: X0 X1 X2 WN |
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* 0 ? ? 0 |
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* 1 ? ? 1 |
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* ? 0 ? 2 |
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* ? 1 ? 3 |
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* ? ? 0 4 |
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* ? ? 1 5 |
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* |
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* Grid on wall WN corresponds to X(WN/2+1)%3 and X(WN/2+2)%3, resp. |
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*/ |
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typedef struct { |
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short w; /* wall number */ |
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short i[2]; /* index on wall grid */ |
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} BCOORD[2]; /* beam grid coordinates */ |
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typedef struct { |
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unsigned int4 nrd; /* number of beam rays bundled on disk */ |
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long fo; /* position in file */ |
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} BEAMI; /* beam index */ |
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typedef struct { |
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unsigned int4 nrm; /* number of beam rays bundled in memory */ |
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unsigned long tick; /* clock tick for LRU replacement */ |
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} BEAM; /* followed by nrm RAYVAL's */ |
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#define hdbray(bp) (RAYVAL *)((bp)+1) |
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#define hdbsiz(nr) (sizeof(BEAM)+(nr)*sizeof(RAYVAL)) |
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typedef struct { |
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FVECT orig; /* prism origin (first) */ |
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FVECT xv[3]; /* side vectors (second) */ |
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int2 grid[3]; /* grid resolution (third) */ |
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} HDGRID; /* holodeck section grid (must match HOLO struct) */ |
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typedef struct holo { |
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FVECT orig; /* prism origin (first) */ |
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FVECT xv[3]; /* side vectors (second) */ |
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int2 grid[3]; /* grid resolution (third) */ |
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int fd; /* file descriptor */ |
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short dirty; /* beam index needs update to file */ |
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double tlin; /* linear range for depth encoding */ |
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FVECT wn[3]; /* wall normals (derived) */ |
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double wo[6]; /* wall offsets (derived) */ |
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FVECT gv[3][2]; /* grid coordinate vectors (derived) */ |
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int wi[6]; /* wall super-indices (derived) */ |
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char *priv; /* pointer to private client data */ |
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BEAM **bl; /* beam pointers (memory cache) */ |
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BEAMI bi[1]; /* beam index (extends struct) */ |
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} HOLO; /* holodeck section */ |
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#define nbeams(hp) (2*((hp)->wi[5]-1)) |
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#define biglob(hp) ((hp)->bi) |
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#define blglob(hp) (*(hp)->bl) |
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#define bnrays(hp,i) ((hp)->bl[i]!=NULL ? (hp)->bl[i]->nrm : (hp)->bi[i].nrd) |
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#define hdflush(hp) (hdfreebeam(hp,0) && hdsync(hp)) |
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extern HOLO *hdinit(); |
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extern BEAM *hdgetbeam(); |
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extern RAYVAL *hdnewrays(); |
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extern long hdmemuse(), hdfiluse(); |
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extern double hdray(), hdinter(); |
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extern unsigned hdcode(); |
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extern int hdcachesize; /* target cache size (bytes) */ |
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extern unsigned long hdclock; /* holodeck system clock */ |
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extern HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */ |
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extern float hd_depthmap[]; /* depth conversion map */ |
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#define hddepth(hp,dc) ( (dc) >= DCINF ? FHUGE : \ |
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(hp)->tlin * ( (dc) >= DCLIN ? \ |
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hd_depthmap[(dc)-DCLIN] : \ |
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((dc)+.5)/DCLIN ) ) |
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#define HOLOFMT "Holodeck" /* file format identifier */ |
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#define HOLOVERS 0 /* file format version number */ |
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#define HOLOMAGIC (327+HOLOVERS) /* file magic number */ |
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/* |
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* A holodeck file consists of an information header terminated by a |
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* blank line, with "FORMAT=Holodeck" somewhere in it. |
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* The first integer after the information header is the |
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* above magic number, which includes the file format version number. |
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* The first longword after the magic number is the position |
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* of the SECOND holodeck section, or 0 if there is only one. |
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* This longword is immediately followed by the first holodeck |
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* section header and directory. |
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* Similarly, every holodeck section in the file is preceeded by |
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* a pointer to the following section, or 0 for the final section. |
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* Since holodeck files consist of directly written C data structures, |
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* they are not generally portable between different machine architectures. |
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* In particular, different floating point formats or bit/byte ordering |
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* will make the data unusable. This is unfortunate, and may be changed |
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* in future versions, but we thought this would be best for paging speed |
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* in our initial implementation. |
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*/ |
