| 0,0 → 1,87 |
|---|
| // Emacs style mode select -*- C++ -*- |
| //----------------------------------------------------------------------------- |
| // |
| // $Id:$ |
| // |
| // Copyright (C) 1993-1996 by id Software, Inc. |
| // |
| // This source is available for distribution and/or modification |
| // only under the terms of the DOOM Source Code License as |
| // published by id Software. All rights reserved. |
| // |
| // The source is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License |
| // for more details. |
| // |
| // $Log:$ |
| // |
| // DESCRIPTION: |
| // Fixed point implementation. |
| // |
| //----------------------------------------------------------------------------- |
| |
| |
| static const char |
| rcsid[] = "$Id: m_bbox.c,v 1.1 1997/02/03 22:45:10 b1 Exp $"; |
| |
| #include "stdlib.h" |
| |
| #include "doomtype.h" |
| #include "i_system.h" |
| |
| #ifdef __GNUG__ |
| #pragma implementation "m_fixed.h" |
| #endif |
| #include "m_fixed.h" |
| |
| |
| |
| |
| // Fixme. __USE_C_FIXED__ or something. |
| |
| fixed_t |
| FixedMul |
| ( fixed_t a, |
| fixed_t b ) |
| { |
| return ((long long) a * (long long) b) >> FRACBITS; |
| } |
| |
| |
| |
| // |
| // FixedDiv, C version. |
| // |
| |
| fixed_t |
| FixedDiv |
| ( fixed_t a, |
| fixed_t b ) |
| { |
| if ( (abs(a)>>14) >= abs(b)) |
| return (a^b)<0 ? MININT : MAXINT; |
| return FixedDiv2 (a,b); |
| } |
| |
| |
| |
| fixed_t |
| FixedDiv2 |
| ( fixed_t a, |
| fixed_t b ) |
| { |
| #if 0 |
| long long c; |
| c = ((long long)a<<16) / ((long long)b); |
| return (fixed_t) c; |
| #endif |
| |
| double c; |
| |
| c = ((double)a) / ((double)b) * FRACUNIT; |
| |
| if (c >= 2147483648.0 || c < -2147483648.0) |
| I_Error("FixedDiv: divide by zero"); |
| return (fixed_t) c; |
| } |