98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
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#pragma once
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#include "Types/BaseTypes.h"
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#include "Types/String.h"
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#include "Types/Span.h"
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#if _MSC_VER && PLATFORM_SIMD_SSE4_2
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#include <intrin.h>
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#endif
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namespace Utilities
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{
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struct Private
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{
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static FLAXENGINE_API Span<const Char*> BytesSizes;
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static FLAXENGINE_API Span<const Char*> HertzSizes;
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};
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// Round floating point value up to 1 decimal place
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template<typename T>
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FORCE_INLINE T RoundTo1DecimalPlace(T value)
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{
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return (T)round((double)value * 10) / (T)10;
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}
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// Round floating point value up to 2 decimal places
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template<typename T>
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FORCE_INLINE T RoundTo2DecimalPlaces(T value)
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{
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return (T)round((double)value * 100.0) / (T)100;
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}
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// Round floating point value up to 3 decimal places
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template<typename T>
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FORCE_INLINE T RoundTo3DecimalPlaces(T value)
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{
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return (T)round((double)value * 1000.0) / (T)1000;
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}
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// Converts units to the best fitting human-readable denominator
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// @param units Units count
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// @param divider Amount of units required for the next size
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// @param sizes Array with human-readable sizes to convert from
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// @return The best fitting string of the units
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template<typename T>
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String UnitsToText(T units, int32 divider, const Span<const Char*> sizes)
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{
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if (sizes.Length() == 0)
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return String::Format(TEXT("{0}"), units);
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int32 i = 0;
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double dblSUnits = static_cast<double>(units);
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for (; static_cast<uint64>(units / static_cast<double>(divider)) > 0; i++, units /= divider)
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dblSUnits = (double)units / (double)divider;
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if (i >= sizes.Length())
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i = 0;
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String text = String::Format(TEXT("{}"), RoundTo2DecimalPlaces(dblSUnits));
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const int32 dot = text.FindLast('.');
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if (dot != -1)
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text = text.Left(dot + 3);
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return String::Format(TEXT("{0} {1}"), text, sizes[i]);
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}
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// Converts size of the file (in bytes) to the best fitting string
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// @param bytes Size of the file in bytes
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// @return The best fitting string of the file size
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template<typename T>
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String BytesToText(T bytes)
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{
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return UnitsToText(bytes, 1024, Private::BytesSizes);
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}
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// Converts hertz to the best fitting string
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// @param hertz Hertz for convertion
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// @return The best fitting string
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template<typename T>
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String HertzToText(T hertz)
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{
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return UnitsToText(hertz, 1000, Private::HertzSizes);
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}
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// Returns the amount of set bits in 32-bit integer.
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inline int32 CountBits(uint32 x)
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{
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// [Reference: https://stackoverflow.com/questions/109023/how-to-count-the-number-of-set-bits-in-a-32-bit-integer]
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#ifdef __GNUC_
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return __builtin_popcount(x);
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#elif _MSC_VER && PLATFORM_SIMD_SSE4_2
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return __popcnt(x);
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#else
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x = x - ((x >> 1) & 0x55555555);
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x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
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x = (x + (x >> 4)) & 0x0F0F0F0F;
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return (x * 0x01010101) >> 24;
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#endif
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}
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}
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