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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 S_NTH_NEXT(s,n) S_NTH_W_DIR(s,n) |
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#define sUnalloc_samp(s,n) (S_NTH_NEXT(s,n) = S_FREE_SAMP(s),S_FREE_SAMP(s)=n) |
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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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