// 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.
|
|
#include "Math.hpp"
|
|
namespace sw
|
{
|
inline uint64_t FNV_1a(uint64_t hash, unsigned char data)
|
{
|
return (hash ^ data) * 1099511628211;
|
}
|
|
uint64_t FNV_1a(const unsigned char *data, int size)
|
{
|
int64_t hash = 0xCBF29CE484222325;
|
|
for(int i = 0; i < size; i++)
|
{
|
hash = FNV_1a(hash, data[i]);
|
}
|
|
return hash;
|
}
|
|
unsigned char sRGB8toLinear8(unsigned char value)
|
{
|
static unsigned char sRGBtoLinearTable[256] = { 255 };
|
if(sRGBtoLinearTable[0] == 255)
|
{
|
for(int i = 0; i < 256; i++)
|
{
|
sRGBtoLinearTable[i] = static_cast<unsigned char>(sw::sRGBtoLinear(static_cast<float>(i) / 255.0f) * 255.0f + 0.5f);
|
}
|
}
|
|
return sRGBtoLinearTable[value];
|
}
|
}
|
