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66 lines
1.5 KiB
C++
66 lines
1.5 KiB
C++
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// Copyright(C) 1993-1996 Id Software, Inc.
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// Copyright(C) 2005 Simon Howard
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//
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// This program 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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//
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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. See the
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// GNU General Public License for more details.
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//
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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., 59 Temple Place - Suite 330, Boston, MA
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// 02111-1307, USA.
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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 "vpo_local.h"
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namespace vpo
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{
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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 ((int64_t) a * (int64_t) 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 FixedDiv(fixed_t a, fixed_t b)
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{
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if ((abs(a) >> 14) >= abs(b))
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{
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return (a^b) < 0 ? INT_MIN : INT_MAX;
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}
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else
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{
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int64_t result;
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result = ((int64_t) a << 16) / b;
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return (fixed_t) result;
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}
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}
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} // namespace vpo
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