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 #include "Math.hpp" 16 17 namespace sw 18 { 19 inline uint64_t FNV_1a(uint64_t hash, unsigned char data) 20 { 21 return (hash ^ data) * 1099511628211; 22 } 23 24 uint64_t FNV_1a(const unsigned char *data, int size) 25 { 26 int64_t hash = 0xCBF29CE484222325; 27 28 for(int i = 0; i < size; i++) 29 { 30 hash = FNV_1a(hash, data[i]); 31 } 32 33 return hash; 34 } 35 36 unsigned char sRGB8toLinear8(unsigned char value) 37 { 38 static unsigned char sRGBtoLinearTable[256] = { 255 }; 39 if(sRGBtoLinearTable[0] == 255) 40 { 41 for(int i = 0; i < 256; i++) 42 { 43 sRGBtoLinearTable[i] = static_cast<unsigned char>(sw::sRGBtoLinear(static_cast<float>(i) / 255.0f) * 255.0f + 0.5f); 44 } 45 } 46 47 return sRGBtoLinearTable[value]; 48 } 49 } 50
