ref: fdf020f1309bffde33554f5a13c7b3a1a3fb1891
dir: /sys/src/games/doom/m_fixed.c/
// 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 "doomdef.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 ((long long)a << FRACBITS) / (long long)b; }