50 lines
1.9 KiB
Java
50 lines
1.9 KiB
Java
/*
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* This file is part of BlueMap, licensed under the MIT License (MIT).
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*
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* Copyright (c) Blue (Lukas Rieger) <https://bluecolored.de>
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* Copyright (c) contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* 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 in
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* 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 OR
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* 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 THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package de.bluecolored.bluemap.core.util;
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import com.flowpowered.math.vector.Vector2i;
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public class Vector2iCache {
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private static final int CACHE_SIZE = 0x4000;
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private static final int CACHE_MASK = CACHE_SIZE - 1;
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private final Vector2i[] cache;
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public Vector2iCache() {
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this.cache = new Vector2i[CACHE_SIZE];
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}
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public Vector2i get(int x, int y) {
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int cacheIndex = (x * 1456 ^ y * 948375892) & CACHE_MASK;
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Vector2i possibleMatch = cache[cacheIndex];
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if (possibleMatch != null && possibleMatch.getX() == x && possibleMatch.getY() == y) {
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return possibleMatch;
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}
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return cache[cacheIndex] = new Vector2i(x, y);
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}
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}
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