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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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|
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/* |
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* sm_samp.c |
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*/ |
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#include "standard.h" |
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#include "sm_flag.h" |
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#include "rhd_sample.h" |
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|
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SAMP rsL; |
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int4 *samp_flag=NULL; |
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|
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/* Each sample has a world coord point, and direction, brightness,chrominance, |
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and RGB triples |
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*/ |
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|
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#define TMSIZE sizeof(TMbright) |
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#define SAMPSIZ (3*sizeof(SFLOAT)+sizeof(int4)+ 6*sizeof(BYTE) + TMSIZE + 2*sizeof(int)) |
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|
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/* Extra points world space point, vert flag and qt flag */ |
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#define POINTSIZ (3*sizeof(SFLOAT) + 2*sizeof(int)) |
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|
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/* Clear the flags for all samples */ |
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sClear_all_flags(s) |
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SAMP *s; |
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{ |
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if(samp_flag) |
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bzero((char *)samp_flag,FLAG_BYTES(S_MAX_BASE_PT(s))); |
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} |
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|
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sInit(s) |
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SAMP *s; |
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{ |
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S_REPLACE_SAMP(s) = 0; |
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S_NUM_SAMP(s) = 0; |
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S_TONE_MAP(s) = 0; |
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S_FREE_SAMP(s) = -1; |
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sClear_base_points(s); |
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|
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} |
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|
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sFree(s) |
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SAMP *s; |
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{ |
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if(S_BASE(s)) |
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{ |
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free(S_BASE(s)); |
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S_BASE(s)=NULL; |
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} |
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if(samp_flag) |
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{ |
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free(samp_flag); |
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samp_flag = NULL; |
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} |
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} |
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/* Initialize/clear global smL sample list for at least n samples */ |
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SAMP |
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*sAlloc(nptr,extra_points) |
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int *nptr,extra_points; |
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{ |
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unsigned nbytes; |
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register unsigned i; |
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SAMP *s; |
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int n; |
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|
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s = &rsL; |
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/* round space up to nearest power of 2 */ |
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nbytes = (*nptr)*SAMPSIZ + extra_points*POINTSIZ + 8; |
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for (i = 1024; nbytes > i; i <<= 1) |
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; |
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/* get number of samples that fit in block */ |
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n = (i - 8 - extra_points*POINTSIZ) / SAMPSIZ; |
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|
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S_BASE(s) = (char *)malloc(n*SAMPSIZ + extra_points*POINTSIZ); |
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if (!S_BASE(s)) |
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error(SYSTEM,"sAlloc(): Unable to allocate memory"); |
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|
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/* assign larger alignment types earlier */ |
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S_W_PT(s) = (SFLOAT(*)[3])S_BASE(s); |
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S_W_DIR(s) = (int4 *)(S_W_PT(s) + n + extra_points); |
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S_BRT(s) = (TMbright *)(S_W_DIR(s) + n); |
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S_CHR(s) = (BYTE (*)[3])(S_BRT(s) + n); |
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S_RGB(s) = (BYTE (*)[3])(S_CHR(s) + n); |
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S_INFO(s) = (int *)(S_RGB(s)+n); |
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S_INFO1(s) = (int *)(S_INFO(s)+n+extra_points); |
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S_MAX_SAMP(s) = n; |
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S_MAX_BASE_PT(s) = n + extra_points; |
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|
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/* Allocate memory for a per/sample bit flag */ |
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if(!(samp_flag = (int4 *)malloc(FLAG_BYTES(n+extra_points)))) |
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error(SYSTEM,"sAlloc(): Unable to allocate flag memory"); |
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sInit(s); |
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sClear_all_flags(s); |
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|
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*nptr = n; |
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|
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return(s); |
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} |
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|
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|
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/* Add a base point to the sample structure: only the world point |
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is added: These points are not displayed-they are used to form the |
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initial mesh |
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*/ |
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int |
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sAdd_base_point(s,v) |
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SAMP *s; |
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FVECT v; |
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{ |
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int id; |
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|
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/* Get pointer to next available point */ |
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id = S_NEXT_BASE_PT(s); |
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if(id >= S_MAX_BASE_PT(s)) |
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return(-1); |
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|
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/* Update free aux pointer */ |
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S_NEXT_BASE_PT(s)++; |
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|
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/* Copy vector into point */ |
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VCOPY(S_NTH_W_PT(s,id),v); |
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return(id); |
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} |
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|
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/* Copy the values of sample n_id into sample id: Note must not call with |
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Base point n_id |
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*/ |
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int |
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sCopy_samp(s,n_id,id) |
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SAMP *s; |
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int n_id,id; |
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{ |
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|
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#ifdef DEBUG |
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if(id <0||id >= S_MAX_SAMP(s)||n_id <0||n_id >= S_MAX_SAMP(s)) |
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{ |
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eputs("smReset_sample():invalid sample id\n"); |
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return(0); |
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} |
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#endif |
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if(n_id == id) |
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return(1); |
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/* Copy vector into point */ |
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VCOPY(S_NTH_W_PT(s,n_id),S_NTH_W_PT(s,id)); |
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S_NTH_W_DIR(s,n_id) = S_NTH_W_DIR(s,id); |
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|
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S_NTH_BRT(s,n_id) = S_NTH_BRT(s,id); |
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S_NTH_CHR(s,n_id)[0] = S_NTH_CHR(s,id)[0]; |
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S_NTH_CHR(s,n_id)[1] = S_NTH_CHR(s,id)[1]; |
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S_NTH_CHR(s,n_id)[2] = S_NTH_CHR(s,id)[2]; |
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|
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return(1); |
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} |
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|
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|
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/* Initialize the sample 'id' to contain world point 'p', direction 'd' and |
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color 'c'. If 'p' is NULL, a direction only is represented in 'd'. In |
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this case, the world point is set to the projection of the direction on |
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the view sphere, and the direction value is set to -1 |
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*/ |
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void |
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sInit_samp(s,id,c,d,p,o_id) |
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SAMP *s; |
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int id; |
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COLR c; |
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FVECT d,p; |
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int o_id; |
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{ |
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|
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if(o_id != INVALID) |
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sCopy_samp(s,id,o_id); |
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else |
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{ |
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/* Copy vector into point */ |
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VCOPY(S_NTH_W_PT(s,id),p); |
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if(d) |
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S_NTH_W_DIR(s,id) = encodedir(d); |
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else |
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S_NTH_W_DIR(s,id) = -1; |
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|
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/* calculate the brightness and chrominance,RGB will be set by |
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tonemapping |
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*/ |
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#ifndef TEST_DRIVER |
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tmCvColrs(&S_NTH_BRT(s,id),S_NTH_CHR(s,id),c,1); |
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#endif |
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} |
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/* Set ACTIVE bit upon creation */ |
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S_SET_FLAG(id); |
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if(id < S_TONE_MAP(s)) |
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tmMapPixels(S_NTH_RGB(s,id),&S_NTH_BRT(s,id),S_NTH_CHR(s,id),1); |
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} |
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|
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|
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/* Allocate a new sample. If an existing sample was replaced: set flag */ |
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int |
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sAlloc_samp(s,replaced) |
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SAMP *s; |
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int *replaced; |
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|
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{ |
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int id; |
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|
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/* First check if there are any freed sample available */ |
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if((id = S_FREE_SAMP(s)) != INVALID) |
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{ |
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*replaced = 0; |
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#if 0 |
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fprintf(stderr,"allocating previously freed sample %d\n",id); |
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#endif |
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S_FREE_SAMP(s) = S_NTH_NEXT(s,id); |
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return(id); |
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} |
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/* If havn't reached end of sample array:return next sample */ |
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if(S_NUM_SAMP(s) < S_MAX_SAMP(s)) |
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{ |
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id = S_NUM_SAMP(s)++; |
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#if 0 |
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fprintf(stderr,"allocating sample %d\n",id); |
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#endif |
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*replaced = 0; |
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return(id); |
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} |
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|
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#ifdef DEBUG |
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{ |
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static int replace = 0; |
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if(replace == 0) |
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{ |
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eputs("Out of samples: using replacement strategy\n"); |
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replace =1 ; |
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} |
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} |
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#endif |
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|
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/* CLOCKED LRU replacement policy: Search through samples starting |
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with S_REPLACE_SAMP for a sample that does not have its active |
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bit set. Clear bit along the way |
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*/ |
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id = S_REPLACE_SAMP(s); |
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while(S_IS_FLAG(id)) |
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{ |
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S_CLR_FLAG(id); |
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id = (id +1)% S_MAX_SAMP(s); |
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} |
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S_REPLACE_SAMP(s) = (id +1)% S_MAX_SAMP(s); |
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*replaced = 1; |
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return(id); |
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} |
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