| 1 | /*************************************************************************** |
| 2 | * Copyright (C) 2010 PCSX4ALL Team * |
| 3 | * Copyright (C) 2010 Unai * |
| 4 | * * |
| 5 | * This program is free software; you can redistribute it and/or modify * |
| 6 | * it under the terms of the GNU General Public License as published by * |
| 7 | * the Free Software Foundation; either version 2 of the License, or * |
| 8 | * (at your option) any later version. * |
| 9 | * * |
| 10 | * This program is distributed in the hope that it will be useful, * |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
| 13 | * GNU General Public License for more details. * |
| 14 | * * |
| 15 | * You should have received a copy of the GNU General Public License * |
| 16 | * along with this program; if not, write to the * |
| 17 | * Free Software Foundation, Inc., * |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA. * |
| 19 | ***************************************************************************/ |
| 20 | |
| 21 | #ifndef FIXED_H |
| 22 | #define FIXED_H |
| 23 | |
| 24 | #include "arm_features.h" |
| 25 | |
| 26 | typedef s32 fixed; |
| 27 | |
| 28 | #ifdef GPU_TABLE_10_BITS |
| 29 | #define TABLE_BITS 10 |
| 30 | #else |
| 31 | #define TABLE_BITS 16 |
| 32 | #endif |
| 33 | |
| 34 | #define FIXED_BITS 16 |
| 35 | |
| 36 | #define fixed_ZERO ((fixed)0) |
| 37 | #define fixed_ONE ((fixed)1<<FIXED_BITS) |
| 38 | #define fixed_TWO ((fixed)2<<FIXED_BITS) |
| 39 | #define fixed_HALF ((fixed)((1<<FIXED_BITS)>>1)) |
| 40 | |
| 41 | // big precision inverse table. |
| 42 | s32 s_invTable[(1<<TABLE_BITS)]; |
| 43 | |
| 44 | INLINE fixed i2x(const int _x) { return ((_x)<<FIXED_BITS); } |
| 45 | INLINE fixed x2i(const fixed _x) { return ((_x)>>FIXED_BITS); } |
| 46 | |
| 47 | /* |
| 48 | INLINE u32 Log2(u32 _a) |
| 49 | { |
| 50 | u32 c = 0; // result of log2(v) will go here |
| 51 | if (_a & 0xFFFF0000) { _a >>= 16; c |= 16; } |
| 52 | if (_a & 0xFF00) { _a >>= 8; c |= 8; } |
| 53 | if (_a & 0xF0) { _a >>= 4; c |= 4; } |
| 54 | if (_a & 0xC) { _a >>= 2; c |= 2; } |
| 55 | if (_a & 0x2) { _a >>= 1; c |= 1; } |
| 56 | return c; |
| 57 | } |
| 58 | */ |
| 59 | |
| 60 | #ifdef HAVE_ARMV5 |
| 61 | INLINE u32 Log2(u32 x) { u32 res; asm("clz %0,%1" : "=r" (res) : "r" (x)); return 32-res; } |
| 62 | #else |
| 63 | INLINE u32 Log2(u32 x) { u32 i = 0; for ( ; x > 0; ++i, x >>= 1); return i - 1; } |
| 64 | #endif |
| 65 | |
| 66 | #ifdef GPU_TABLE_10_BITS |
| 67 | INLINE void xInv (const fixed _b, s32& iFactor_, s32& iShift_) |
| 68 | { |
| 69 | u32 uD = (_b<0) ? -_b : _b ; |
| 70 | u32 uLog = Log2(uD); |
| 71 | uLog = uLog>(TABLE_BITS-1) ? uLog-(TABLE_BITS-1) : 0; |
| 72 | u32 uDen = uD>>uLog; |
| 73 | iFactor_ = s_invTable[uDen]; |
| 74 | iFactor_ = (_b<0) ? -iFactor_ :iFactor_; |
| 75 | iShift_ = 15+uLog; |
| 76 | } |
| 77 | #else |
| 78 | INLINE void xInv (const fixed _b, s32& iFactor_, s32& iShift_) |
| 79 | { |
| 80 | u32 uD = (_b<0) ? -_b : _b; |
| 81 | if(uD>1) |
| 82 | { |
| 83 | u32 uLog = Log2(uD); |
| 84 | uLog = uLog>(TABLE_BITS-1) ? uLog-(TABLE_BITS-1) : 0; |
| 85 | u32 uDen = (uD>>uLog)-1; |
| 86 | iFactor_ = s_invTable[uDen]; |
| 87 | iFactor_ = (_b<0) ? -iFactor_ :iFactor_; |
| 88 | iShift_ = 15+uLog; |
| 89 | } |
| 90 | else |
| 91 | { |
| 92 | iFactor_=_b; |
| 93 | iShift_ = 0; |
| 94 | } |
| 95 | } |
| 96 | #endif |
| 97 | |
| 98 | INLINE fixed xInvMulx (const fixed _a, const s32 _iFact, const s32 _iShift) |
| 99 | { |
| 100 | #ifdef __arm__ |
| 101 | s64 res; |
| 102 | asm ("smull %Q0, %R0, %1, %2" : "=&r" (res) : "r"(_a) , "r"(_iFact)); |
| 103 | return fixed(res>>_iShift); |
| 104 | #else |
| 105 | return fixed( ((s64)(_a)*(s64)(_iFact))>>(_iShift) ); |
| 106 | #endif |
| 107 | } |
| 108 | |
| 109 | INLINE fixed xLoDivx (const fixed _a, const fixed _b) |
| 110 | { |
| 111 | s32 iFact, iShift; |
| 112 | xInv(_b, iFact, iShift); |
| 113 | return xInvMulx(_a, iFact, iShift); |
| 114 | } |
| 115 | |
| 116 | /////////////////////////////////////////////////////////////////////////// |
| 117 | template<typename T> |
| 118 | INLINE T Min2 (const T _a, const T _b) { return (_a<_b)?_a:_b; } |
| 119 | |
| 120 | template<typename T> |
| 121 | INLINE T Min3 (const T _a, const T _b, const T _c) { return Min2(Min2(_a,_b),_c); } |
| 122 | |
| 123 | /////////////////////////////////////////////////////////////////////////// |
| 124 | template<typename T> |
| 125 | INLINE T Max2 (const T _a, const T _b) { return (_a>_b)?_a:_b; } |
| 126 | |
| 127 | template<typename T> |
| 128 | INLINE T Max3 (const T _a, const T _b, const T _c) { return Max2(Max2(_a,_b),_c); } |
| 129 | |
| 130 | /////////////////////////////////////////////////////////////////////////// |
| 131 | #endif //FIXED_H |