103 lines
3.8 KiB
Java
103 lines
3.8 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.Vector3d;
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import com.flowpowered.math.vector.Vector3f;
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import com.flowpowered.math.vector.Vector3i;
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import com.flowpowered.math.vector.Vector4f;
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public class MathUtil {
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private MathUtil() {}
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public static Vector3d getSurfaceNormal(Vector3d p1, Vector3d p2, Vector3d p3){
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Vector3d u = p2.sub(p1);
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Vector3d v = p3.sub(p1);
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double nX = u.getY() * v.getZ() - u.getZ() * v.getY();
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double nY = u.getZ() * v.getX() - u.getX() * v.getZ();
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double nZ = u.getX() * v.getY() - u.getY() * v.getX();
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return new Vector3d(nX, nY, nZ);
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}
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public static Vector3f getSurfaceNormal(Vector3f p1, Vector3f p2, Vector3f p3) {
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Vector3f u = p2.sub(p1);
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Vector3f v = p3.sub(p1);
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float nX = u.getY() * v.getZ() - u.getZ() * v.getY();
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float nY = u.getZ() * v.getX() - u.getX() * v.getZ();
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float nZ = u.getX() * v.getY() - u.getY() * v.getX();
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Vector3f n = new Vector3f(nX, nY, nZ);
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n = n.normalize();
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return n;
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}
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public static float hashToFloat(Vector3i pos, long seed) {
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return hashToFloat(pos.getX(), pos.getY(), pos.getZ(), seed);
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}
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/**
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* Adapted from https://github.com/SpongePowered/SpongeAPI/blob/ecd761a70219e467dea47a09fc310e8238e9911f/src/main/java/org/spongepowered/api/extra/skylands/SkylandsUtil.java
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*/
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public static float hashToFloat(int x, int y, int z, long seed) {
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final long hash = x * 73428767 ^ y * 9122569 ^ z * 4382893 ^ seed * 457;
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return (hash * (hash + 456149) & 0x00ffffff) / (float) 0x01000000;
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}
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public static Vector4f blendColors(Vector4f top, Vector4f bottom){
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if (top.getW() > 0 && bottom.getW() > 0){
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float a = 1 - (1 - top.getW()) * (1 - bottom.getW());
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float r = (top.getX() * top.getW() / a) + (bottom.getX() * bottom.getW() * (1 - top.getW()) / a);
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float g = (top.getY() * top.getW() / a) + (bottom.getY() * bottom.getW() * (1 - top.getW()) / a);
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float b = (top.getZ() * top.getW() / a) + (bottom.getZ() * bottom.getW() * (1 - top.getW()) / a);
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return new Vector4f(r, g, b, a);
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} else if (bottom.getW() > 0) {
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return bottom;
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} else {
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return top;
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}
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}
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public static Vector4f overlayColors(Vector4f top, Vector4f bottom){
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if (top.getW() > 0 && bottom.getW() > 0){
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float p = (1 - top.getW()) * bottom.getW();
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float a = p + top.getW();
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float r = (p * bottom.getX() + top.getW() * top.getX()) / a;
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float g = (p * bottom.getY() + top.getW() * top.getY()) / a;
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float b = (p * bottom.getZ() + top.getW() * top.getZ()) / a;
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return new Vector4f(r, g, b, a);
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} else if (bottom.getW() > 0) {
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return bottom;
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} else {
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return top;
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}
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}
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}
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