ref: deee694456cec537794d959c90e770dac0b2afde
dir: /src/m_fixed.c/
// // Copyright(C) 1993-1996 Id Software, Inc. // Copyright(C) 2005-2014 Simon Howard // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // DESCRIPTION: // Fixed point implementation. // #include "stdlib.h" #include "doomtype.h" #include "i_system.h" #include "m_fixed.h" // Fixme. __USE_C_FIXED__ or something. fixed_t FixedMul ( fixed_t a, fixed_t b ) { return ((int64_t) a * (int64_t) b) >> FRACBITS; } // // FixedDiv, C version. // fixed_t FixedDiv(fixed_t a, fixed_t b) { if ((abs(a) >> 14) >= abs(b)) { return (a^b) < 0 ? INT_MIN : INT_MAX; } else { int64_t result; result = ((int64_t) a << FRACBITS) / b; return (fixed_t) result; } }