140 lines
3.1 KiB
C++
140 lines
3.1 KiB
C++
/*
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* The 3D Studio File Format Library
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* Copyright (C) 1996-2001 by J.E. Hoffmann <je-h@gmx.net>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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#define LIB3DS_EXPORT
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#include <tcb.h>
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#include <readwrite.h>
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#include <math.h>
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/*!
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* \defgroup tcb Tension/Continuity/Bias Splines
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*
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* \author J.E. Hoffmann <je-h@gmx.net>
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*/
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/*!
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* \ingroup tcb
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*/
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void
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lib3ds_tcb(Lib3dsTcb *p, Lib3dsTcb *pc, Lib3dsTcb *c, Lib3dsTcb *nc, Lib3dsTcb *n,
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Lib3dsFloat *ksm, Lib3dsFloat *ksp, Lib3dsFloat *kdm, Lib3dsFloat *kdp)
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{
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Lib3dsFloat tm,cm,cp,bm,bp,tmcm,tmcp,cc;
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Lib3dsFloat dt,fp,fn;
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if (!pc) {
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pc=c;
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}
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if (!nc) {
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nc=c;
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}
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fp=fn=1.0f;
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if (p&&n) {
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dt=0.5f*(Lib3dsFloat)(pc->frame-p->frame+n->frame-nc->frame);
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fp=((Lib3dsFloat)(pc->frame-p->frame))/dt;
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fn=((Lib3dsFloat)(n->frame-nc->frame))/dt;
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cc=(Lib3dsFloat)fabs(c->cont);
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fp=fp+cc-cc*fp;
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fn=fn+cc-cc*fn;
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}
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cm=1.0f-c->cont;
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tm=0.5f*(1.0f-c->tens);
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cp=2.0f-cm;
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bm=1.0f-c->bias;
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bp=2.0f-bm;
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tmcm=tm*cm;
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tmcp=tm*cp;
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*ksm=tmcm*bp*fp;
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*ksp=tmcp*bm*fp;
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*kdm=tmcp*bp*fn;
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*kdp=tmcm*bm*fn;
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}
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/*!
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* \ingroup tcb
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*/
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Lib3dsBool
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lib3ds_tcb_read(Lib3dsTcb *tcb, FILE *f)
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{
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Lib3dsWord flags;
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tcb->frame=lib3ds_intd_read(f);
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tcb->flags=flags=lib3ds_word_read(f);
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if (flags&LIB3DS_USE_TENSION) {
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tcb->tens=lib3ds_float_read(f);
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}
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if (flags&LIB3DS_USE_CONTINUITY) {
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tcb->cont=lib3ds_float_read(f);
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}
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if (flags&LIB3DS_USE_BIAS) {
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tcb->bias=lib3ds_float_read(f);
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}
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if (flags&LIB3DS_USE_EASE_TO) {
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tcb->ease_to=lib3ds_float_read(f);
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}
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if (flags&LIB3DS_USE_EASE_FROM) {
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tcb->ease_from=lib3ds_float_read(f);
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}
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if (ferror(f)) {
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return(LIB3DS_FALSE);
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}
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return(LIB3DS_TRUE);
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}
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/*!
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* \ingroup tcb
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*/
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Lib3dsBool
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lib3ds_tcb_write(Lib3dsTcb *tcb, FILE *f)
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{
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lib3ds_intd_write(tcb->frame,f);
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lib3ds_word_write(tcb->flags,f);
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if (tcb->flags&LIB3DS_USE_TENSION) {
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lib3ds_float_write(tcb->tens,f);
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}
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if (tcb->flags&LIB3DS_USE_CONTINUITY) {
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lib3ds_float_write(tcb->cont,f);
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}
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if (tcb->flags&LIB3DS_USE_BIAS) {
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lib3ds_float_write(tcb->bias,f);
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}
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if (tcb->flags&LIB3DS_USE_EASE_TO) {
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lib3ds_float_write(tcb->ease_to,f);
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}
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if (tcb->flags&LIB3DS_USE_EASE_FROM) {
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lib3ds_float_write(tcb->ease_from,f);
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}
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if (ferror(f)) {
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return(LIB3DS_FALSE);
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}
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return(LIB3DS_TRUE);
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}
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