1/* 2 * Copyright 2009 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Dave Airlie 23 */ 24#ifndef RADEON_FIXED_H 25#define RADEON_FIXED_H 26 27typedef union rfixed { 28 u32 full; 29} fixed20_12; 30 31 32#define rfixed_const(A) (u32)(((A) << 12))/* + ((B + 0.000122)*4096)) */ 33#define rfixed_const_half(A) (u32)(((A) << 12) + 2048) 34#define rfixed_const_666(A) (u32)(((A) << 12) + 2731) 35#define rfixed_const_8(A) (u32)(((A) << 12) + 3277) 36#define rfixed_mul(A, B) ((u64)((u64)(A).full * (B).full + 2048) >> 12) 37#define fixed_init(A) { .full = rfixed_const((A)) } 38#define fixed_init_half(A) { .full = rfixed_const_half((A)) } 39#define rfixed_trunc(A) ((A).full >> 12) 40 41static inline u32 rfixed_div(fixed20_12 A, fixed20_12 B) 42{ 43 u64 tmp = ((u64)A.full << 13); 44 45 do_div(tmp, B.full); 46 tmp += 1; 47 tmp /= 2; 48 return lower_32_bits(tmp); 49} 50#endif 51