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 #include "CPUID.hpp" 18 19 namespace sw 20 { FNV_1a(uint64_t hash,unsigned char data)21 inline uint64_t FNV_1a(uint64_t hash, unsigned char data) 22 { 23 return (hash ^ data) * 1099511628211; 24 } 25 FNV_1a(const unsigned char * data,int size)26 uint64_t FNV_1a(const unsigned char *data, int size) 27 { 28 int64_t hash = 0xCBF29CE484222325; 29 30 for(int i = 0; i < size; i++) 31 { 32 hash = FNV_1a(hash, data[i]); 33 } 34 35 return hash; 36 } 37 sRGB8toLinear8(unsigned char value)38 unsigned char sRGB8toLinear8(unsigned char value) 39 { 40 static unsigned char sRGBtoLinearTable[256] = { 255 }; 41 if(sRGBtoLinearTable[0] == 255) 42 { 43 for(int i = 0; i < 256; i++) 44 { 45 sRGBtoLinearTable[i] = static_cast<unsigned char>(sw::sRGBtoLinear(static_cast<float>(i) / 255.0f) * 255.0f + 0.5f); 46 } 47 } 48 49 return sRGBtoLinearTable[value]; 50 } 51 } 52