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109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
//-------------------------------------------------------------------------
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/*
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Copyright (C) 1997, 2005 - 3D Realms Entertainment
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This file is part of Shadow Warrior version 1.2
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Shadow Warrior is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Original Source: 1997 - Frank Maddin and Jim Norwood
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Prepared for public release: 03/28/2005 - Charlie Wiederhold, 3D Realms
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*/
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//-------------------------------------------------------------------------
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#include "compat.h"
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#include "pragmas.h"
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#include "interp.h"
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#define SHORT_MAXINTERPOLATIONS 256
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short short_numinterpolations = 0, short_startofdynamicinterpolations = 0;
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short short_oldipos[SHORT_MAXINTERPOLATIONS];
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short short_bakipos[SHORT_MAXINTERPOLATIONS];
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short *short_curipos[SHORT_MAXINTERPOLATIONS];
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void short_setinterpolation(short *posptr)
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{
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int i;
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if (short_numinterpolations >= SHORT_MAXINTERPOLATIONS)
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return;
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for (i = short_numinterpolations - 1; i >= 0; i--)
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{
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if (short_curipos[i] == posptr)
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return;
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}
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short_curipos[short_numinterpolations] = posptr;
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short_oldipos[short_numinterpolations] = *posptr;
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short_numinterpolations++;
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}
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void short_stopinterpolation(short *posptr)
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{
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int i;
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for (i = short_numinterpolations - 1; i >= short_startofdynamicinterpolations; i--)
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{
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if (short_curipos[i] == posptr)
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{
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short_numinterpolations--;
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short_oldipos[i] = short_oldipos[short_numinterpolations];
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short_bakipos[i] = short_bakipos[short_numinterpolations];
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short_curipos[i] = short_curipos[short_numinterpolations];
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}
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}
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}
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void short_updateinterpolations(void) // Stick at beginning of domovethings
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{
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int i;
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for (i = short_numinterpolations - 1; i >= 0; i--)
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short_oldipos[i] = *short_curipos[i];
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}
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// must call restore for every do interpolations
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// make sure you don't exit
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void short_dointerpolations(int smoothratio) // Stick at beginning of drawscreen
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{
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int i, j, odelta, ndelta;
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ndelta = 0;
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j = 0;
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for (i = short_numinterpolations - 1; i >= 0; i--)
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{
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short_bakipos[i] = *short_curipos[i];
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odelta = ndelta;
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ndelta = (*short_curipos[i]) - short_oldipos[i];
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if (odelta != ndelta)
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j = mulscale16(ndelta, smoothratio);
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*short_curipos[i] = short_oldipos[i] + j;
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}
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}
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void short_restoreinterpolations(void) // Stick at end of drawscreen
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{
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int i;
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for (i = short_numinterpolations - 1; i >= 0; i--)
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*short_curipos[i] = short_bakipos[i];
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}
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