66 lines
2.0 KiB
C++
66 lines
2.0 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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#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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// 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 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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static const Char* sizes[] = { TEXT("B"), TEXT("KB"), TEXT("MB"), TEXT("GB"), TEXT("TB") };
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uint64 i = 0;
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double dblSByte = static_cast<double>(bytes);
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for (; static_cast<uint64>(bytes / 1024.0) > 0; i++, bytes /= 1024)
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dblSByte = bytes / 1024.0;
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if (i >= ARRAY_COUNT(sizes))
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return String::Empty;
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return String::Format(TEXT("{0} {1}"), RoundTo2DecimalPlaces(dblSByte), sizes[i]);
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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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