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https://github.com/ZDoom/qzdoom.git
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66 lines
1.4 KiB
C++
66 lines
1.4 KiB
C++
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source 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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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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// $Log:$
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//
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// DESCRIPTION:
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// Fixed point implementation.
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//
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//-----------------------------------------------------------------------------
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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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#include "m_fixed.h"
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#ifndef USEASM
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// C routines
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fixed_t FixedMul_C (fixed_t a, fixed_t b)
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{
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return (fixed_t)(((__int64) a * (__int64) b) >> FRACBITS);
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}
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fixed_t FixedDiv_C (fixed_t a, 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 ? FIXED_MIN : FIXED_MAX;
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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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/*
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if (c >= 2147483648.0 || c < -2147483648.0)
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I_FatalError("FixedDiv: divide by zero");
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*/
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return (fixed_t) c;
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}
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}
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#endif
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