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https://github.com/id-Software/DOOM-3-BFG.git
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93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
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/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code 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. See the
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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 Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#include "Precompiled.h"
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#include "globaldata.h"
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#include "stdlib.h"
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#include "doomtype.h"
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#include "i_system.h"
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#ifdef __GNUG__
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#pragma implementation "m_fixed.h"
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#endif
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#include "m_fixed.h"
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// Fixme. __USE_C_FIXED__ or something.
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fixed_t
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FixedMul
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( fixed_t a,
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fixed_t b )
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{
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return fixed_t( ((long long) a * (long long) b) >> FRACBITS );
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}
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//
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// FixedDiv, C version.
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//
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fixed_t
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FixedDiv
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( fixed_t a,
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fixed_t b )
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{
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if ( (abs(a)>>14) >= abs(b))
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return (a^b)<0 ? MININT : MAXINT;
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return FixedDiv2 (a,b);
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}
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fixed_t
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FixedDiv2
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( fixed_t a,
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fixed_t b )
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{
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#if 0
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long long c;
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c = ((long long)a<<16) / ((long long)b);
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return (fixed_t) c;
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#endif
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double c;
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c = ((double)a) / ((double)b) * FRACUNIT;
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if (c >= 2147483648.0 || c < -2147483648.0)
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I_Error("FixedDiv: divide by zero");
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return (fixed_t) c;
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}
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