93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
/*
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* Copyright (C) 2018-2023 Intel Corporation
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*
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* SPDX-License-Identifier: MIT
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*
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*/
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#pragma once
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#include "shared/source/helpers/constants.h"
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#include <cstdint>
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namespace NEO {
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template <uint8_t numBits>
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struct StorageType;
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template <>
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struct StorageType<8> {
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using Type = uint8_t;
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};
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template <>
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struct StorageType<16> {
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using Type = uint16_t;
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};
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template <>
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struct StorageType<32> {
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using Type = uint32_t;
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};
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template <>
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struct StorageType<64> {
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using Type = uint64_t;
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};
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template <uint8_t numBits>
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struct StorageType {
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using Type = typename StorageType<numBits + 1>::Type;
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};
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template <uint8_t numBits>
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using StorageTypeT = typename StorageType<numBits>::Type;
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template <uint8_t integerBits, uint8_t fractionalBits, uint8_t totalBits = integerBits + fractionalBits>
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struct UnsignedFixedPointValue {
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UnsignedFixedPointValue(float v) {
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fromFloatingPoint(v);
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}
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StorageTypeT<totalBits> &getRawAccess() {
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return storage;
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}
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static constexpr float getMaxRepresentableFloat() {
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return getMaxRepresentableFloatingPointValue<float>();
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}
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float asFloat() {
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return asFloatPointType<float>();
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}
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protected:
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template <typename FloatingType>
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static constexpr FloatingType getMaxRepresentableFloatingPointValue() {
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return static_cast<FloatingType>(
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static_cast<FloatingType>(maxNBitValue(integerBits)) + (static_cast<FloatingType>(maxNBitValue(fractionalBits)) / (1U << fractionalBits)));
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}
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template <typename FloatingType>
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void fromFloatingPoint(FloatingType val) {
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auto maxFloatVal = getMaxRepresentableFloatingPointValue<FloatingType>();
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// clamp to [0, maxFloatVal]
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val = (val < FloatingType{0}) ? FloatingType{0} : val;
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val = (val > maxFloatVal) ? maxFloatVal : val;
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// scale to fixed point representation
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this->storage = static_cast<StorageTypeT<totalBits>>(val * (1U << fractionalBits));
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}
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template <typename FloatingType>
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FloatingType asFloatPointType() {
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return static_cast<FloatingType>(storage) / (1U << fractionalBits);
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}
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StorageTypeT<totalBits> storage = 0;
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};
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using FixedU4D8 = UnsignedFixedPointValue<4, 8>;
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} // namespace NEO
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