1 // Copyright 2016 The SwiftShader Authors. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 // mathutil.h: Math and bit manipulation functions. 16 17 #ifndef LIBGLES_CM_MATHUTIL_H_ 18 #define LIBGLES_CM_MATHUTIL_H_ 19 20 #include "common/debug.h" 21 #include "Common/Math.hpp" 22 23 namespace es1 24 { 25 inline bool isPow2(int x) 26 { 27 return (x & (x - 1)) == 0 && (x != 0); 28 } 29 30 inline int log2(int x) 31 { 32 int r = 0; 33 while((x >> r) > 1) r++; 34 return r; 35 } 36 37 inline unsigned int ceilPow2(unsigned int x) 38 { 39 if(x != 0) x--; 40 x |= x >> 1; 41 x |= x >> 2; 42 x |= x >> 4; 43 x |= x >> 8; 44 x |= x >> 16; 45 x++; 46 47 return x; 48 } 49 50 using sw::clamp; 51 using sw::clamp01; 52 53 template<const int n> 54 inline unsigned int unorm(float x) 55 { 56 const unsigned int max = 0xFFFFFFFF >> (32 - n); 57 58 if(x > 1) 59 { 60 return max; 61 } 62 else if(x < 0) 63 { 64 return 0; 65 } 66 else 67 { 68 return (unsigned int)(max * x + 0.5f); 69 } 70 } 71 } 72 73 #endif // LIBGLES_CM_MATHUTIL_H_ 74
