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/* Copyright (c) 1998 Silicon Graphics, Inc. */
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/* SCCSid "$SunId$ SGI" */
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/*
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* Sample data structures for holodeck display drivers.
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*/
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#include "color.h"
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#include "tonemap.h"
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#include "rhdriver.h"
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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 int
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#endif
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#ifndef INVALID
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#define INVALID -1
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#endif
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typedef struct samp {
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float (*wp)[3]; /* world intersection point array */
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int4 *wd; /* world direction array */
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#ifndef HP_VERSION
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TMbright *brt; /* encoded brightness array */
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#endif
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BYTE (*chr)[3]; /* encoded chrominance array */
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BYTE (*rgb)[3]; /* tone-mapped color array */
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int max_samp; /* maximum number of samples */
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int max_base_pt; /* maximum number of aux points */
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int next_base_pt; /* next auxilliary point to add */
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int replace_samp; /* next sample to free */
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int num_samp; /* current number of samples */
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int tone_map; /* pointer to next value(s)t tonemap*/
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int free_samp; /* Available sample */
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char *base; /* base of allocated memory */
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} SAMP;
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/* Sample field access macros */
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#define S_W_PT(s) ((s)->wp)
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#define S_W_DIR(s) ((s)->wd)
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#define S_BRT(s) ((s)->brt)
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#define S_CHR(s) ((s)->chr)
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#define S_RGB(s) ((s)->rgb)
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#define S_MAX_SAMP(s) ((s)->max_samp)
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#define S_MAX_BASE_PT(s) ((s)->max_base_pt)
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#define S_NEXT_BASE_PT(s) ((s)->next_base_pt)
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#define S_REPLACE_SAMP(s) ((s)->replace_samp)
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#define S_NUM_SAMP(s) ((s)->num_samp)
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#define S_TONE_MAP(s) ((s)->tone_map)
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#define S_FREE_SAMP(s) ((s)->free_samp)
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#define S_BASE(s) ((s)->base)
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#define S_MAX_POINTS(s) ((s)->max_base_pt)
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#define S_NTH_W_PT(s,n) (S_W_PT(s)[(n)])
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#define S_NTH_W_DIR(s,n) (S_W_DIR(s)[(n)])
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#define S_NTH_RGB(s,n) (S_RGB(s)[(n)])
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#define S_NTH_CHR(s,n) (S_CHR(s)[(n)])
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#ifndef HP_VERSION
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#define S_NTH_BRT(s,n) (S_BRT(s)[(n)])
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#endif
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/* Sample Flag macros */
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#define S_IS_FLAG(s) IS_FLAG(samp_flag,s)
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#define S_SET_FLAG(s) SET_FLAG(samp_flag,s)
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#define S_CLR_FLAG(s) CLR_FLAG(samp_flag,s)
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#define sUnalloc_samp(s,sid) (S_FREE_SAMP(s) = sid)
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#define sClear_base_points(s) (S_NEXT_BASE_PT(s) = S_MAX_SAMP(s))
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#define sClear(s) sInit(s)
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/* Max allowed angle of sample dir from current view */
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#define MAXANG 20
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#define MAXDIFF2 ( MAXANG*MAXANG * (PI*PI/180./180.))
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extern SAMP rsL;
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extern double sDepthEps; /* epsilon to compare depths (z fraction) */
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extern int4 encodedir(); /* Encodes FVECT direction */
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extern void decodedir(); /* Decodes dir-> FVECT */
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extern double fdir2diff(), dir2diff(); /* Compare dir and FVECT */
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extern int4 *samp_flag; /* Per/sample flags s */
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/* These values are set by the driver, and used in the OGL call for glFrustum*/
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extern double dev_zmin,dev_zmax;
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extern SAMP *sAlloc();
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