93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
/*
|
|
* Copyright (C) 2018-2020 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: MIT
|
|
*
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "shared/source/helpers/constants.h"
|
|
|
|
#include <cstdint>
|
|
|
|
namespace NEO {
|
|
|
|
template <uint8_t NumBits>
|
|
struct StorageType;
|
|
|
|
template <>
|
|
struct StorageType<8> {
|
|
using Type = uint8_t;
|
|
};
|
|
|
|
template <>
|
|
struct StorageType<16> {
|
|
using Type = uint16_t;
|
|
};
|
|
|
|
template <>
|
|
struct StorageType<32> {
|
|
using Type = uint32_t;
|
|
};
|
|
|
|
template <>
|
|
struct StorageType<64> {
|
|
using Type = uint64_t;
|
|
};
|
|
|
|
template <uint8_t NumBits>
|
|
struct StorageType {
|
|
using Type = typename StorageType<NumBits + 1>::Type;
|
|
};
|
|
|
|
template <uint8_t NumBits>
|
|
using StorageTypeT = typename StorageType<NumBits>::Type;
|
|
|
|
template <uint8_t IntegerBits, uint8_t FractionalBits, uint8_t TotalBits = IntegerBits + FractionalBits>
|
|
struct UnsignedFixedPointValue {
|
|
UnsignedFixedPointValue(float v) {
|
|
fromFloatingPoint(v);
|
|
}
|
|
|
|
StorageTypeT<TotalBits> &getRawAccess() {
|
|
return storage;
|
|
}
|
|
|
|
static constexpr float getMaxRepresentableFloat() {
|
|
return getMaxRepresentableFloatingPointValue<float>();
|
|
}
|
|
|
|
float asFloat() {
|
|
return asFloatPointType<float>();
|
|
}
|
|
|
|
protected:
|
|
template <typename FloatingType>
|
|
static constexpr FloatingType getMaxRepresentableFloatingPointValue() {
|
|
return static_cast<FloatingType>(
|
|
static_cast<FloatingType>(maxNBitValue(IntegerBits)) + (static_cast<FloatingType>(maxNBitValue(FractionalBits)) / (1U << FractionalBits)));
|
|
}
|
|
|
|
template <typename FloatingType>
|
|
void fromFloatingPoint(FloatingType val) {
|
|
auto maxFloatVal = getMaxRepresentableFloatingPointValue<FloatingType>();
|
|
// clamp to [0, maxFloatVal]
|
|
val = (val < FloatingType{0}) ? FloatingType{0} : val;
|
|
val = (val > maxFloatVal) ? maxFloatVal : val;
|
|
|
|
// scale to fixed point representation
|
|
this->storage = static_cast<StorageTypeT<TotalBits>>(val * (1U << FractionalBits));
|
|
}
|
|
|
|
template <typename FloatingType>
|
|
FloatingType asFloatPointType() {
|
|
return static_cast<FloatingType>(storage) / (1U << FractionalBits);
|
|
}
|
|
|
|
StorageTypeT<TotalBits> storage = 0;
|
|
};
|
|
|
|
using FixedU4D8 = UnsignedFixedPointValue<4, 8>;
|
|
} // namespace NEO
|