blender/intern/opennl/superlu/scopy_to_ucol.c
Brecht Van Lommel 0b12e61040 OpenNL: modify SuperLU to use doubles rather than floats, for better precision.
This helps to improve the accuracy of UV unwrapping and laplacian deform for
high poly meshes, which could get warped quite badly. It's not much slower,
doubles are pretty fast on modern CPUs, but it does double memory usage. This
seems acceptable as otherwise high poly meshes would not work correctly anyway.

Fixes T39004.
2014-09-26 00:04:10 +02:00

109 lines
2.7 KiB
C

/** \file opennl/superlu/scopy_to_ucol.c
* \ingroup opennl
*/
/*
* -- SuperLU routine (version 2.0) --
* Univ. of California Berkeley, Xerox Palo Alto Research Center,
* and Lawrence Berkeley National Lab.
* November 15, 1997
*
*/
/*
Copyright (c) 1994 by Xerox Corporation. All rights reserved.
THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
Permission is hereby granted to use or copy this program for any
purpose, provided the above notices are retained on all copies.
Permission to modify the code and to distribute modified code is
granted, provided the above notices are retained, and a notice that
the code was modified is included with the above copyright notice.
*/
#include "ssp_defs.h"
#include "util.h"
int
scopy_to_ucol(
int jcol, /* in */
int nseg, /* in */
int *segrep, /* in */
int *repfnz, /* in */
int *perm_r, /* in */
double *dense, /* modified - reset to zero on return */
GlobalLU_t *Glu /* modified */
)
{
/*
* Gather from SPA dense[*] to global ucol[*].
*/
int ksub, krep, ksupno;
int i, k, kfnz, segsze;
int fsupc, isub, irow;
int jsupno, nextu;
int new_next, mem_error;
int *xsup, *supno;
int *lsub, *xlsub;
double *ucol;
int *usub, *xusub;
int nzumax;
double zero = 0.0;
xsup = Glu->xsup;
supno = Glu->supno;
lsub = Glu->lsub;
xlsub = Glu->xlsub;
ucol = Glu->ucol;
usub = Glu->usub;
xusub = Glu->xusub;
nzumax = Glu->nzumax;
jsupno = supno[jcol];
nextu = xusub[jcol];
k = nseg - 1;
for (ksub = 0; ksub < nseg; ksub++) {
krep = segrep[k--];
ksupno = supno[krep];
if ( ksupno != jsupno ) { /* Should go into ucol[] */
kfnz = repfnz[krep];
if ( kfnz != EMPTY ) { /* Nonzero U-segment */
fsupc = xsup[ksupno];
isub = xlsub[fsupc] + kfnz - fsupc;
segsze = krep - kfnz + 1;
new_next = nextu + segsze;
while ( new_next > nzumax ) {
if ((mem_error = sLUMemXpand(jcol, nextu, UCOL, &nzumax, Glu)))
return (mem_error);
ucol = Glu->ucol;
if ((mem_error = sLUMemXpand(jcol, nextu, USUB, &nzumax, Glu)))
return (mem_error);
usub = Glu->usub;
lsub = Glu->lsub;
}
for (i = 0; i < segsze; i++) {
irow = lsub[isub];
usub[nextu] = perm_r[irow];
ucol[nextu] = dense[irow];
dense[irow] = zero;
nextu++;
isub++;
}
}
}
} /* for each segment... */
xusub[jcol + 1] = nextu; /* Close U[*,jcol] */
return 0;
}