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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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/* SCCSid "$SunId$ SGI" */ |
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/* RCSid: $Id$ */ |
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/* |
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* Header file for holodeck programs |
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* |
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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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#ifndef MAXDIRSE |
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#define MAXDIRSE 32 /* maximum seeks per directory write */ |
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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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COLR v; /* color value */ |
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unsigned int2 d; /* depth code (from entry wall) */ |
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} RAYVAL; /* ray value */ |
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/* |
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* Walls are ordered: X0 X1 X2 WN |
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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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off_t fo; /* position in file */ |
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} BEAMI; /* beam index */ |
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typedef struct { |
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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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struct { |
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int s, n; /* dirty section start, length */ |
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} dirseg[MAXDIRSE+1]; /* dirty beam index segments */ |
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short dirty; /* number of dirty segments */ |
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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 wg[3]; /* wall grid multipliers (derived) */ |
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double wo[6]; /* wall offsets (derived) */ |
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FVECT wg[3]; /* wall grid 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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int b; /* beam index */ |
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} HDBEAMI; /* holodeck beam index */ |
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#define nbeams(hp) (2*((hp)->wi[5]-1)) |
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#define nbeams(hp) (((hp)->wi[5]-1)<<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,0)) |
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#define hdclobber(hp) (hdkillbeam(hp,0) && hdsync(hp,0)) |
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#define hdflush(hp) (hdfreebeam(hp,0), hdsync(hp,0)) |
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#define hdclobber(hp) (hdkillbeam(hp,0), hdsync(hp,0)) |
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extern HOLO *hdinit(), *hdalloc(); |
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extern BEAM *hdgetbeam(); |
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extern RAYVAL *hdnewrays(); |
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extern unsigned hdmemuse(); |
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extern long hdfiluse(), hdfilen(); |
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extern off_t hdfiluse(), hdfilen(), hdallocfrag(); |
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extern double hdray(), hdinter(); |
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extern unsigned hdcode(); |
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extern int hdfilord(); |
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#define FF_NEVER 0 /* never free fragments */ |
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#define FF_WRITE 01 /* free fragment on write */ |
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#define FF_ALLOC 02 /* free fragment on ray alloc */ |
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#define FF_READ 04 /* free fragment on read */ |
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#define FF_KILL 010 /* free fragment on beam kill */ |
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extern int hdfragflags; /* tells when to free fragments */ |
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extern unsigned 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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extern int hdwg0[6]; /* wall grid 0 index */ |
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extern int hdwg1[6]; /* wall grid 1 index */ |
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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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#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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#define HOLOMAGIC (323+sizeof(off_t)+8*HOLOVERS) /* file magic number */ |
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/* |
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* A holodeck file consists of an information header terminated by a |
