106 lines
3.2 KiB
C++
106 lines
3.2 KiB
C++
/*
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* Copyright (c) 2018, Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#include <cstdint>
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namespace OCLRT {
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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>((1U << IntegerBits) - 1) + (static_cast<FloatingType>((1U << FractionalBits) - 1) / (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 OCLRT
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