| // Copyright 2016 The SwiftShader Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // mathutil.h: Math and bit manipulation functions. |
| |
| #ifndef LIBGLES_CM_MATHUTIL_H_ |
| #define LIBGLES_CM_MATHUTIL_H_ |
| |
| #include "common/debug.h" |
| #include "Common/Math.hpp" |
| |
| namespace es1 |
| { |
| inline bool isPow2(int x) |
| { |
| return (x & (x - 1)) == 0 && (x != 0); |
| } |
| |
| inline int log2(int x) |
| { |
| int r = 0; |
| while((x >> r) > 1) r++; |
| return r; |
| } |
| |
| inline unsigned int ceilPow2(unsigned int x) |
| { |
| if(x != 0) x--; |
| x |= x >> 1; |
| x |= x >> 2; |
| x |= x >> 4; |
| x |= x >> 8; |
| x |= x >> 16; |
| x++; |
| |
| return x; |
| } |
| |
| using sw::clamp; |
| using sw::clamp01; |
| |
| template<const int n> |
| inline unsigned int unorm(float x) |
| { |
| const unsigned int max = 0xFFFFFFFF >> (32 - n); |
| |
| if(x > 1) |
| { |
| return max; |
| } |
| else if(x < 0) |
| { |
| return 0; |
| } |
| else |
| { |
| return (unsigned int)(max * x + 0.5f); |
| } |
| } |
| } |
| |
| #endif // LIBGLES_CM_MATHUTIL_H_ |