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#ifndef lint |
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static const char RCSid[] = "$Id: rttree_reduce.c,v 2.13 2016/03/06 01:13:18 schorsch Exp $"; |
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#endif |
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/* |
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* A utility called by genBSDF.pl to reduce tensor tree samples and output |
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* in a standard format as required by XML specification for variable |
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* resolution BSDF data. We are not meant to be run by the user directly. |
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*/ |
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|
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#include "rtio.h" |
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#include "rterror.h" |
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#include "platform.h" |
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#include <stdlib.h> |
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#include <math.h> |
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|
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float *datarr; /* our loaded BSDF data array */ |
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int ttrank = 4; /* tensor tree rank */ |
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int log2g = 4; /* log2 of grid resolution */ |
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int infmt = 'a'; /* input format ('a','f','d') */ |
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double pctcull = 95.; /* target culling percentile */ |
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|
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#define dval3(ix,ox,oy) datarr[((((ix)<<log2g)+(ox))<<log2g)+(oy)] |
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#define dval4(ix,iy,ox,oy) datarr[((((((ix)<<log2g)+(iy))<<log2g)+(ox))<<log2g)+(oy)] |
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|
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/* Tensor tree node */ |
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typedef struct ttree_s { |
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float vmin, vmax; /* value extrema */ |
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float vavg; /* average */ |
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struct ttree_s *kid; /* 2^ttrank children */ |
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} TNODE; |
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|
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#define HISTLEN 300 /* histogram resolution */ |
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#define HISTMAX 10. /* maximum recorded measure in histogram */ |
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|
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int histo[HISTLEN]; /* histogram freq. of variance measure */ |
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|
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double tthresh; /* acceptance threshold (TBD) */ |
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|
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#define var_measure(tp) ( ((tp)->vmax - (tp)->vmin) / \ |
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(sqrt((tp)->vavg) + .03) ) |
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#define above_threshold(tp) (var_measure(tp) > tthresh) |
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|
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/* Allocate a new set of children for the given node (no checks) */ |
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static void |
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new_kids(TNODE *pn) |
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{ |
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pn->kid = (TNODE *)calloc((size_t)1<<ttrank, sizeof(TNODE)); |
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if (pn->kid == NULL) |
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error(SYSTEM, "out of memory in new_kids"); |
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} |
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|
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/* Free children for this node */ |
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static void |
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free_kids(TNODE *pn) |
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{ |
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int i; |
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|
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if (pn->kid == NULL) |
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return; |
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for (i = 1<<ttrank; i--; ) |
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free_kids(pn->kid+i); |
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free(pn->kid); |
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pn->kid = NULL; |
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} |
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|
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/* Build a tensor tree starting from the given hypercube */ |
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static void |
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build_tree(TNODE *tp, const int bmin[], int l2s) |
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{ |
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int bkmin[4]; |
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int i, j; |
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|
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tp->vmin = 1e20; |
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tp->vmax = 0; |
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tp->vavg = 0; |
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if (l2s <= 1) { /* reached upper leaves */ |
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for (i = 1<<ttrank; i--; ) { |
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float val; |
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for (j = ttrank; j--; ) |
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bkmin[j] = bmin[j] + (i>>j & 1); |
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val = (ttrank == 3) ? dval3(bkmin[0],bkmin[1],bkmin[2]) |
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: dval4(bkmin[0],bkmin[1],bkmin[2],bkmin[3]); |
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if (val < tp->vmin) |
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tp->vmin = val; |
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if (val > tp->vmax) |
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tp->vmax = val; |
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tp->vavg += val; |
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} |
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tp->vavg /= (float)(1<<ttrank); |
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/* record stats */ |
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i = (HISTLEN/HISTMAX) * var_measure(tp); |
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if (i >= HISTLEN) i = HISTLEN-1; |
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++histo[i]; |
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return; |
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} |
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--l2s; /* else still branching */ |
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new_kids(tp); /* grow recursively */ |
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for (i = 1<<ttrank; i--; ) { |
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for (j = ttrank; j--; ) |
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bkmin[j] = bmin[j] + ((i>>j & 1)<<l2s); |
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build_tree(tp->kid+i, bkmin, l2s); |
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if (tp->kid[i].vmin < tp->vmin) |
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tp->vmin = tp->kid[i].vmin; |
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if (tp->kid[i].vmax > tp->vmax) |
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tp->vmax = tp->kid[i].vmax; |
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tp->vavg += tp->kid[i].vavg; |
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} |
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tp->vavg /= (float)(1<<ttrank); |
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} |
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|
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/* Set our trimming threshold */ |
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static void |
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set_threshold(void) |
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{ |
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int hsum = 0; |
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int i; |
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|
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for (i = HISTLEN; i--; ) |
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hsum += histo[i]; |
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hsum = pctcull*.01 * (double)hsum; |
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for (i = 0; hsum > 0; i++) |
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hsum -= histo[i]; |
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tthresh = (HISTMAX/HISTLEN) * i; |
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} |
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|
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/* Trim our tree according to the current threshold */ |
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static void |
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trim_tree(TNODE *tp) |
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{ |
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if (tp->kid == NULL) |
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return; |
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if (above_threshold(tp)) { /* keeping branches? */ |
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int i = 1<<ttrank; |
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while (i--) |
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trim_tree(tp->kid+i); |
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return; |
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} |
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free_kids(tp); /* else trim at this point */ |
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} |
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|
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/* Print a tensor tree from the given hypercube */ |
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static void |
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print_tree(const TNODE *tp, const int bmin[], int l2s) |
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{ |
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int bkmin[4]; |
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int i, j; |
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|
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for (j = log2g-l2s; j--; ) /* indent based on branch level */ |
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fputs(" ", stdout); |
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fputc('{', stdout); /* special case for upper leaves */ |
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if (l2s <= 1 && above_threshold(tp)) { |
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for (i = 0; i < 1<<ttrank; i++) { |
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float val; |
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for (j = ttrank; j--; ) |
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bkmin[j] = bmin[j] + (i>>(ttrank-1-j) & 1); |
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val = (ttrank == 3) ? dval3(bkmin[0],bkmin[1],bkmin[2]) |
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: dval4(bkmin[0],bkmin[1],bkmin[2],bkmin[3]); |
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printf((0.001<=val)&(val<10.) ? " %.7f" : " %.3e", val); |
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} |
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fputs(" }\n", stdout); |
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return; |
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} |
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if (tp->kid == NULL) { /* trimmed limb */ |
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printf(" %.6e }\n", tp->vavg); |
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return; |
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} |
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--l2s; /* else still branching */ |
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fputc('\n', stdout); |
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for (i = 0; i < 1<<ttrank; i++) { |
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for (j = ttrank; j--; ) |
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bkmin[j] = bmin[j] + ((i>>j & 1)<<l2s); |
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print_tree(tp->kid+i, bkmin, l2s); |
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} |
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++l2s; |
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for (j = log2g-l2s; j--; ) |
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fputs(" ", stdout); |
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fputs("}\n", stdout); |
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} |
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|
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/* Read a row of data in ASCII */ |
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static int |
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read_ascii(float *rowp, int n) |
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{ |
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int n2go; |
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|
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if ((rowp == NULL) | (n <= 0)) |
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return(0); |
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for (n2go = n; n2go; n2go--) |
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if (scanf("%f", rowp++) != 1) |
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break; |
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if (n2go) |
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error(USER, "unexpected EOD on ascii input"); |
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return(n-n2go); |
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} |
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|
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/* Read a row of float data */ |
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static int |
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read_float(float *rowp, int n) |
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{ |
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int nread; |
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|
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if ((rowp == NULL) | (n <= 0)) |
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return(0); |
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nread = fread(rowp, sizeof(float), n, stdin); |
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if (nread != n) |
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error(USER, "unexpected EOF on float input"); |
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return(nread); |
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} |
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|
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/* Read a row of double data */ |
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static int |
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read_double(float *rowp, int n) |
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{ |
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static double *rowbuf = NULL; |
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static int rblen = 0; |
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int nread, i; |
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|
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if ((rowp == NULL) | (n <= 0)) { |
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if (rblen) { |
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free(rowbuf); |
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rowbuf = NULL; rblen = 0; |
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} |
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return(0); |
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} |
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if (rblen < n) { |
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rowbuf = (double *)realloc(rowbuf, sizeof(double)*(rblen=n)); |
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if (rowbuf == NULL) |
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error(SYSTEM, "out of memory in read_double"); |
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} |
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nread = fread(rowbuf, sizeof(double), n, stdin); |
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if (nread != n) |
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error(USER, "unexpected EOF on double input"); |
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for (i = 0; i < nread; i++) |
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*rowp++ = rowbuf[i]; |
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return(nread); |
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} |
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|
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/* Truncate any negative values to zero */ |
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static void |
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noneg(float *varr, int n) |
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{ |
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int nnan = 0; |
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|
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while (n-- > 0) { |
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#ifdef isnan |
| 246 |
if (isnan(*varr)) { |
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*varr = 0; |
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++nnan; |
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} else |
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#endif |
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if (*varr < 0) *varr = 0; |
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++varr; |
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} |
| 254 |
if (nnan) |
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fprintf(stderr, "Warning: BSDF data contains %d NaN values\n", |
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nnan); |
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} |
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|
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/* Load data array, filling zeroes for rank 3 demi-tensor */ |
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static void |
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load_data(void) |
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{ |
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int (*readf)(float *, int) = NULL; |
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|
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switch (infmt) { |
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case 'a': |
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readf = &read_ascii; |
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break; |
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case 'f': |
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readf = &read_float; |
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break; |
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case 'd': |
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readf = &read_double; |
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break; |
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default: |
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error(COMMAND, "unsupported input format"); |
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break; |
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} |
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/* XXX VC warns about 32 bit shift coerced to 64 bit */ |
| 280 |
datarr = (float *)calloc(1<<(log2g*ttrank), sizeof(float)); |
| 281 |
if (datarr == NULL) |
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error(SYSTEM, "out of memory in load_data"); |
| 283 |
if (ttrank == 3) { |
| 284 |
int ix, ox; |
| 285 |
for (ix = 0; ix < 1<<(log2g-1); ix++) |
| 286 |
for (ox = 0; ox < 1<<log2g; ox++) |
| 287 |
(*readf)(datarr+(((ix<<log2g)+ox)<<log2g), |
| 288 |
1<<log2g); |
| 289 |
} else /* ttrank == 4 */ { |
| 290 |
int ix, iy, ox; |
| 291 |
for (ix = 0; ix < 1<<log2g; ix++) |
| 292 |
for (iy = 0; iy < 1<<log2g; iy++) |
| 293 |
for (ox = 0; ox < 1<<log2g; ox++) |
| 294 |
(*readf)(datarr + |
| 295 |
(((((ix<<log2g)+iy)<<log2g)+ox)<<log2g), |
| 296 |
1<<log2g); |
| 297 |
} |
| 298 |
(*readf)(NULL, 0); /* releases any buffers */ |
| 299 |
if (infmt == 'a') { |
| 300 |
int c; |
| 301 |
while ((c = getc(stdin)) != EOF) { |
| 302 |
switch (c) { |
| 303 |
case ' ': |
| 304 |
case '\t': |
| 305 |
case '\r': |
| 306 |
case '\n': |
| 307 |
continue; |
| 308 |
} |
| 309 |
error(WARNING, "data past end of expected input"); |
| 310 |
break; |
| 311 |
} |
| 312 |
} else if (getc(stdin) != EOF) |
| 313 |
error(WARNING, "binary data past end of expected input"); |
| 314 |
|
| 315 |
noneg(datarr, 1<<(log2g*ttrank)); /* take precautions */ |
| 316 |
} |
| 317 |
|
| 318 |
/* Enforce reciprocity by averaging data values */ |
| 319 |
static void |
| 320 |
do_reciprocity(void) |
| 321 |
{ |
| 322 |
const int siz = 1<<log2g; |
| 323 |
float *v1p, *v2p; |
| 324 |
|
| 325 |
if (ttrank == 3) { |
| 326 |
int ix, ox, oy; |
| 327 |
for (ix = 0; ix < siz>>1; ix++) |
| 328 |
for (ox = 0; ox < siz; ox++) |
| 329 |
for (oy = 0; oy < siz>>1; oy++) { |
| 330 |
v1p = &dval3(ix,ox,oy); |
| 331 |
v2p = &dval3(ix,ox,siz-1-oy); |
| 332 |
*v1p = *v2p = .5f*( *v1p + *v2p ); |
| 333 |
} |
| 334 |
} else /* ttrank == 4 */ { |
| 335 |
int ix, iy, ox, oy; |
| 336 |
for (ix = 1; ix < siz; ix++) |
| 337 |
for (iy = 1; iy < siz; iy++) |
| 338 |
for (ox = 0; ox < ix; ox++) |
| 339 |
for (oy = 0; oy < iy; oy++) { |
| 340 |
v1p = &dval4(siz-1-ix,siz-1-iy,ox,oy); |
| 341 |
v2p = &dval4(siz-1-ox,siz-1-oy,ix,iy); |
| 342 |
*v1p = *v2p = .5f*( *v1p + *v2p ); |
| 343 |
} |
| 344 |
} |
| 345 |
} |
| 346 |
|
| 347 |
/* Load BSDF array, coalesce uniform regions and format as tensor tree */ |
| 348 |
int |
| 349 |
main(int argc, char *argv[]) |
| 350 |
{ |
| 351 |
int doheader = 1; |
| 352 |
int recipavg = 0; |
| 353 |
int bmin[4]; |
| 354 |
TNODE gtree; |
| 355 |
int i; |
| 356 |
/* get options and parameters */ |
| 357 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
| 358 |
switch (argv[i][1]) { |
| 359 |
case 'a': |
| 360 |
recipavg = !recipavg; |
| 361 |
break; |
| 362 |
case 'h': |
| 363 |
doheader = !doheader; |
| 364 |
break; |
| 365 |
case 'r': |
| 366 |
ttrank = atoi(argv[++i]); |
| 367 |
if (ttrank != 3 && ttrank != 4) |
| 368 |
goto userr; |
| 369 |
break; |
| 370 |
case 'g': |
| 371 |
log2g = atoi(argv[++i]); |
| 372 |
if (log2g <= 1) |
| 373 |
goto userr; |
| 374 |
break; |
| 375 |
case 't': |
| 376 |
pctcull = atof(argv[++i]); |
| 377 |
if ((pctcull < 0) | (pctcull >= 100.)) |
| 378 |
goto userr; |
| 379 |
break; |
| 380 |
case 'f': |
| 381 |
infmt = argv[i][2]; |
| 382 |
if (!infmt || strchr("afd", infmt) == NULL) |
| 383 |
goto userr; |
| 384 |
break; |
| 385 |
default: |
| 386 |
goto userr; |
| 387 |
} |
| 388 |
if (i < argc-1) |
| 389 |
goto userr; |
| 390 |
/* load input data */ |
| 391 |
if (i == argc-1 && freopen(argv[i], "r", stdin) == NULL) { |
| 392 |
sprintf(errmsg, "cannot open input file '%s'", argv[i]); |
| 393 |
error(SYSTEM, errmsg); |
| 394 |
} |
| 395 |
if (infmt != 'a') |
| 396 |
SET_FILE_BINARY(stdin); |
| 397 |
#ifdef getc_unlocked /* avoid lock/unlock overhead */ |
| 398 |
flockfile(stdin); |
| 399 |
#endif |
| 400 |
load_data(); |
| 401 |
if (recipavg) |
| 402 |
do_reciprocity(); |
| 403 |
if (doheader) { |
| 404 |
for (i = 0; i < argc; i++) { |
| 405 |
fputs(argv[i], stdout); |
| 406 |
fputc(i < argc-1 ? ' ' : '\n', stdout); |
| 407 |
} |
| 408 |
fputc('\n', stdout); |
| 409 |
} |
| 410 |
gtree.kid = NULL; /* create our tree */ |
| 411 |
bmin[0] = bmin[1] = bmin[2] = bmin[3] = 0; |
| 412 |
build_tree(>ree, bmin, log2g); |
| 413 |
/* compute threshold & trim tree */ |
| 414 |
set_threshold(); |
| 415 |
trim_tree(>ree); |
| 416 |
/* format to stdout */ |
| 417 |
print_tree(>ree, bmin, log2g); |
| 418 |
/* Clean up isn't necessary for main()... |
| 419 |
free_kids(>ree); |
| 420 |
free(datarr); |
| 421 |
*/ |
| 422 |
return(0); |
| 423 |
userr: |
| 424 |
fprintf(stderr, "Usage: %s [-h][-a][-f{a|f|d}][-r {3|4}][-g log2grid][-t trim%%] [input]\n", |
| 425 |
argv[0]); |
| 426 |
return(1); |
| 427 |
} |
