--- ray/src/hd/holo.h	1997/11/11 16:59:34	3.5
+++ ray/src/hd/holo.h	2003/02/22 02:07:24	3.20
@@ -1,7 +1,4 @@
-/* Copyright (c) 1997 Silicon Graphics, Inc. */
-
-/* SCCSid "$SunId$ SGI" */
-
+/* RCSid: $Id: holo.h,v 3.20 2003/02/22 02:07:24 greg Exp $ */
 /*
  * Header file for holodeck programs
  *
@@ -14,21 +11,19 @@
 #ifndef HDMAX
 #define HDMAX		128	/* maximum active holodeck sections */
 #endif
-#ifndef int2
-#define int2	short
+
+#ifndef MAXDIRSE
+#define MAXDIRSE	32	/* maximum seeks per directory write */
 #endif
-#ifndef int4
-#define int4	long
-#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;		/* value */
-	unsigned int2	d;	/* depth code */
-} RAYVAL;		/* ray value (from second wall) */
+	COLR 	v;		/* color value */
+	unsigned int2	d;	/* depth code (from entry wall) */
+} RAYVAL;		/* ray value */
 
 /*
  * Walls are ordered:		X0	X1	X2	WN
@@ -71,38 +66,57 @@ typedef struct holo {
 	FVECT	xv[3];		/* side vectors (second) */
 	int2	grid[3];	/* grid resolution (third) */
 	int	fd;		/* file descriptor */
-	short	dirty;		/* beam index needs update to file */
+	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	wn[3];		/* wall normals (derived) */
-	double	wg[3];		/* wall grid multipliers (derived) */
-	double	wo[6];		/* wall offsets (derived) */
+	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 */
 
-#define nbeams(hp)	(2*((hp)->wi[5]-1))
+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))
+#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 long	hdmemuse(), hdfiluse();
+extern unsigned	hdmemuse();
+extern long	hdfiluse(), hdfilen(), hdallocfrag();
 extern double	hdray(), hdinter();
 extern unsigned	hdcode();
+extern int	hdfilord();
 
-extern int	hdcachesize;		/* target cache size (bytes) */
+#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] : \
@@ -110,15 +124,15 @@ extern float	hd_depthmap[];		/* depth conversion map *
 
 #define HOLOFMT		"Holodeck"	/* file format identifier */
 #define HOLOVERS	0		/* file format version number */
-#define HOLOMAGIC	(327+HOLOVERS)	/* file magic number */
+#define HOLOMAGIC	(323+sizeof(long)+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 the position
- * of the SECOND holodeck section, or 0 if there is only one.
+ * 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