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78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
#include "minecraft/util/Mth.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <array>
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#include <numbers>
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#include <sstream>
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#include <string>
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#include "java/Random.h"
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constexpr size_t SIN_TAB_CNT = 65536;
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constexpr float SIN_SCALE = SIN_TAB_CNT / (std::numbers::pi_v<float> * 2.0f);
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static std::array<float, SIN_TAB_CNT> makeSinTable() {
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std::array<float, SIN_TAB_CNT> t{};
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for (size_t i = 0; i < SIN_TAB_CNT; i++)
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t[i] = (float)::sin(i * std::numbers::pi * 2.0 / (double)SIN_TAB_CNT);
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return t;
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}
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static const std::array<float, SIN_TAB_CNT> sinTable = makeSinTable();
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float Mth::sin(float i) {
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return sinTable[(int32_t)::fmodf(i * SIN_SCALE, (float)SIN_TAB_CNT) &
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(SIN_TAB_CNT - 1)];
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}
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float Mth::cos(float i) {
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return sinTable[(int32_t)::fmodf(i * SIN_SCALE + (float)SIN_TAB_CNT / 4,
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(float)SIN_TAB_CNT) &
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(SIN_TAB_CNT - 1)];
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}
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// 4J Changed this to remove the use of the actual UUID type
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std::wstring Mth::createInsecureUUID(Random* random) {
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wchar_t output[33];
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output[32] = 0;
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int64_t high = (random->nextLong() & ~UUID_VERSION) | UUID_VERSION_TYPE_4;
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int64_t low = (random->nextLong() & ~UUID_VARIANT) | UUID_VARIANT_2;
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for (int i = 0; i < 16; i++) {
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wchar_t nybbleHigh = high & 0xf;
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wchar_t nybbleLow = low & 0xf;
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nybbleHigh =
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(nybbleHigh > 9) ? (nybbleHigh + (L'a' - 10)) : (nybbleHigh + L'0');
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nybbleLow =
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(nybbleLow > 9) ? (nybbleLow + (L'a' - 10)) : (nybbleLow + L'0');
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high >>= 4;
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low >>= 4;
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output[31 - i] = nybbleLow;
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output[15 - i] = nybbleHigh;
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}
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return std::wstring(output);
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}
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int Mth::getInt(const std::wstring& input, int def) {
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std::wistringstream stream(input);
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int result;
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return (stream >> result) ? result : def;
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}
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int Mth::getInt(const std::wstring& input, int def, int min) {
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int result = getInt(input, def);
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return result < min ? min : result;
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}
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double Mth::getDouble(const std::wstring& input, double def) {
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std::wistringstream stream(input);
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double result;
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return (stream >> result) ? result : def;
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}
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double Mth::getDouble(const std::wstring& input, double def, double min) {
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double result = getDouble(input, def);
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return result < min ? min : result;
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}
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