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https://github.com/ClassiCube/ClassiCube.git
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392 lines
12 KiB
C#
392 lines
12 KiB
C#
// Copyright 2014-2017 ClassicalSharp | Licensed under BSD-3
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// Based on:
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// https://github.com/UnknownShadow200/ClassicalSharp/wiki/Minecraft-Classic-map-generation-algorithm
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// Thanks to Jerralish for originally reverse engineering classic's algorithm, then preparing a high level overview of the algorithm.
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// I believe this process adheres to clean room reverse engineering.
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using System;
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using System.Collections.Generic;
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namespace ClassicalSharp.Generator {
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public sealed partial class NotchyGenerator : IMapGenerator {
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int width, height, length;
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int waterLevel, oneY;
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byte[] blocks;
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short[] heightmap;
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JavaRandom rnd;
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public override string GeneratorName { get { return "Vanilla classic"; } }
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public override byte[] Generate(int width, int height, int length, int seed) {
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this.width = width;
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this.height = height;
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this.length = length;
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oneY = width * length;
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waterLevel = height / 2;
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blocks = new byte[width * height * length];
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rnd = new JavaRandom(seed);
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CreateHeightmap();
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CreateStrata();
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CarveCaves();
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CarveOreVeins(0.9f, "coal ore", Block.CoalOre);
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CarveOreVeins(0.7f, "iron ore", Block.IronOre);
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CarveOreVeins(0.5f, "gold ore", Block.GoldOre);
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FloodFillWaterBorders();
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FloodFillWater();
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FloodFillLava();
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CreateSurfaceLayer();
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PlantFlowers();
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PlantMushrooms();
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PlantTrees();
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return blocks;
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}
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void CreateHeightmap() {
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Noise n1 = new CombinedNoise(
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new OctaveNoise(8, rnd), new OctaveNoise(8, rnd));
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Noise n2 = new CombinedNoise(
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new OctaveNoise(8, rnd), new OctaveNoise(8, rnd));
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Noise n3 = new OctaveNoise(6, rnd);
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int index = 0;
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short[] hMap = new short[width * length];
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CurrentState = "Building heightmap";
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for (int z = 0; z < length; z++) {
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CurrentProgress = (float)z / length;
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for (int x = 0; x < width; x++) {
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double hLow = n1.Compute(x * 1.3f, z * 1.3f) / 6 - 4;
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double hHigh = n2.Compute(x * 1.3f, z * 1.3f) / 5 + 6;
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double height = n3.Compute(x, z) > 0 ? hLow : Math.Max(hLow, hHigh);
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height *= 0.5;
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if (height < 0) height *= 0.8f;
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hMap[index++] = (short)(height + waterLevel);
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}
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}
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heightmap = hMap;
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}
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void CreateStrata() {
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Noise n = new OctaveNoise(8, rnd);
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CurrentState = "Creating strata";
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int hMapIndex = 0;
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for (int z = 0; z < length; z++) {
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CurrentProgress = (float)z / length;
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for (int x = 0; x < width; x++) {
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int dirtThickness = (int)(n.Compute(x, z) / 24 - 4);
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int dirtHeight = heightmap[hMapIndex++];
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int stoneHeight = dirtHeight + dirtThickness;
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int mapIndex = z * width + x;
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blocks[mapIndex] = Block.Lava;
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mapIndex += oneY;
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for (int y = 1; y < height; y++) {
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byte block = 0;
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if (y <= stoneHeight) block = Block.Stone;
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else if (y <= dirtHeight) block = Block.Dirt;
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blocks[mapIndex] = block;
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mapIndex += oneY;
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}
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}
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}
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}
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void CarveCaves() {
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int cavesCount = blocks.Length / 8192;
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CurrentState = "Carving caves";
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for (int i = 0; i < cavesCount; i++) {
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CurrentProgress = (float)i / cavesCount;
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double caveX = rnd.Next(width);
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double caveY = rnd.Next(height);
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double caveZ = rnd.Next(length);
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int caveLen = (int)(rnd.NextFloat() * rnd.NextFloat() * 200);
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double theta = rnd.NextFloat() * 2 * Math.PI, deltaTheta = 0;
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double phi = rnd.NextFloat() * 2 * Math.PI, deltaPhi = 0;
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double caveRadius = rnd.NextFloat() * rnd.NextFloat();
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for (int j = 0; j < caveLen; j++) {
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caveX += Math.Sin(theta) * Math.Cos(phi);
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caveY += Math.Cos(theta) * Math.Cos(phi);
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caveZ += Math.Sin(phi);
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theta = theta + deltaTheta * 0.2;
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deltaTheta = deltaTheta * 0.9 + rnd.NextFloat() - rnd.NextFloat();
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phi = phi / 2 + deltaPhi / 4;
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deltaPhi = deltaPhi * 0.75 + rnd.NextFloat() - rnd.NextFloat();
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if (rnd.NextFloat() < 0.25) continue;
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int cenX = (int)(caveX + (rnd.Next(4) - 2) * 0.2);
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int cenY = (int)(caveY + (rnd.Next(4) - 2) * 0.2);
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int cenZ = (int)(caveZ + (rnd.Next(4) - 2) * 0.2);
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double radius = (height - cenY) / (double)height;
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radius = 1.2 + (radius * 3.5 + 1) * caveRadius;
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radius = radius + Math.Sin(j * Math.PI / caveLen);
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FillOblateSpheroid(cenX, cenY, cenZ, (float)radius, Block.Air);
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}
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}
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}
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void CarveOreVeins(float abundance, string blockName, byte block) {
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int numVeins = (int)(blocks.Length * abundance / 16384);
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CurrentState = "Carving " + blockName;
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for (int i = 0; i < numVeins; i++) {
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CurrentProgress = (float)i / numVeins;
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double veinX = rnd.Next(width);
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double veinY = rnd.Next(height);
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double veinZ = rnd.Next(length);
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int veinLen = (int)(rnd.NextFloat() * rnd.NextFloat() * 75 * abundance);
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double theta = rnd.NextFloat() * 2 * Math.PI, deltaTheta = 0;
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double phi = rnd.NextFloat() * 2 * Math.PI, deltaPhi = 0;
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for (int j = 0; j < veinLen; j++) {
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veinX += Math.Sin(theta) * Math.Cos(phi);
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veinY += Math.Cos(theta) * Math.Cos(phi);
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veinZ += Math.Sin(phi);
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theta = deltaTheta * 0.2;
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deltaTheta = deltaTheta * 0.9 + rnd.NextFloat() - rnd.NextFloat();
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phi = phi / 2 + deltaPhi / 4;
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deltaPhi = deltaPhi * 0.9 + rnd.NextFloat() - rnd.NextFloat();
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float radius = abundance * (float)Math.Sin(j * Math.PI / veinLen) + 1;
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FillOblateSpheroid((int)veinX, (int)veinY, (int)veinZ, radius, block);
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}
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}
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}
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void FloodFillWaterBorders() {
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int waterY = waterLevel - 1;
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int index1 = (waterY * length + 0) * width + 0;
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int index2 = (waterY * length + (length - 1)) * width + 0;
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CurrentState = "Flooding edge water";
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for (int x = 0; x < width; x++) {
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CurrentProgress = 0 + ((float)x / width) * 0.5f;
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FloodFill(index1, Block.Water);
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FloodFill(index2, Block.Water);
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index1++; index2++;
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}
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index1 = (waterY * length + 0) * width + 0;
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index2 = (waterY * length + 0) * width + (width - 1);
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for (int z = 0; z < length; z++) {
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CurrentProgress = 0.5f + ((float)z / length) * 0.5f;
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FloodFill(index1, Block.Water);
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FloodFill(index2, Block.Water);
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index1 += width; index2 += width;
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}
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}
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void FloodFillWater() {
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int numSources = width * length / 800;
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CurrentState = "Flooding water";
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for (int i = 0; i < numSources; i++) {
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CurrentProgress = (float)i / numSources;
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int x = rnd.Next(width), z = rnd.Next(length);
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int y = waterLevel - rnd.Next(1, 3);
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FloodFill((y * length + z) * width + x, Block.Water);
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}
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}
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void FloodFillLava() {
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int numSources = width * length / 20000;
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CurrentState = "Flooding lava";
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for (int i = 0; i < numSources; i++) {
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CurrentProgress = (float)i / numSources;
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int x = rnd.Next(width), z = rnd.Next(length);
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int y = (int)((waterLevel - 3) * rnd.NextFloat() * rnd.NextFloat());
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FloodFill((y * length + z) * width + x, Block.Lava);
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}
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}
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void CreateSurfaceLayer() {
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Noise n1 = new OctaveNoise(8, rnd), n2 = new OctaveNoise(8, rnd);
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CurrentState = "Creating surface";
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// TODO: update heightmap
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int hMapIndex = 0;
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for (int z = 0; z < length; z++) {
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CurrentProgress = (float)z / length;
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for (int x = 0; x < width; x++) {
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bool sand = n1.Compute(x, z) > 8;
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bool gravel = n2.Compute(x, z) > 12;
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int y = heightmap[hMapIndex++];
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if (y >= height) continue;
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int index = (y * length + z) * width + x;
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byte blockAbove = y >= (height - 1) ? Block.Air : blocks[index + oneY];
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if (blockAbove == Block.Water && gravel) {
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blocks[index] = Block.Gravel;
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} else if (blockAbove == Block.Air) {
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blocks[index] = (y <= waterLevel && sand) ? Block.Sand : Block.Grass;
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}
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}
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}
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}
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void PlantFlowers() {
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int numPatches = width * length / 3000;
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CurrentState = "Planting flowers";
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for (int i = 0; i < numPatches; i++) {
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CurrentProgress = (float)i / numPatches;
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byte type = (byte)(Block.Dandelion + rnd.Next(2));
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int patchX = rnd.Next(width), patchZ = rnd.Next(length);
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for (int j = 0; j < 10; j++) {
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int flowerX = patchX, flowerZ = patchZ;
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for (int k = 0; k < 5; k++) {
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flowerX += rnd.Next(6) - rnd.Next(6);
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flowerZ += rnd.Next(6) - rnd.Next(6);
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if (flowerX < 0 || flowerZ < 0 || flowerX >= width || flowerZ >= length)
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continue;
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int flowerY = heightmap[flowerZ * width + flowerX] + 1;
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int index = (flowerY * length + flowerZ) * width + flowerX;
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if (blocks[index] == Block.Air && blocks[index - oneY] == Block.Grass)
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blocks[index] = type;
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}
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}
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}
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}
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void PlantMushrooms() {
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int numPatches = width * length / 2000;
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CurrentState = "Planting mushrooms";
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for (int i = 0; i < numPatches; i++) {
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CurrentProgress = (float)i / numPatches;
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byte type = (byte)(Block.BrownMushroom + rnd.Next(2));
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int patchX = rnd.Next(width);
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int patchY = rnd.Next(height);
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int patchZ = rnd.Next(length);
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for (int j = 0; j < 20; j++) {
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int mushX = patchX, mushY = patchY, mushZ = patchZ;
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for (int k = 0; k < 5; k++) {
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mushX += rnd.Next(6) - rnd.Next(6);
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mushZ += rnd.Next(6) - rnd.Next(6);
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if (mushX < 0 || mushZ < 0 || mushX >= width || mushZ >= length)
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continue;
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int solidHeight = heightmap[mushZ * width + mushX];
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if (mushY >= (solidHeight - 1))
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continue;
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int index = (mushY * length + mushZ) * width + mushX;
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if (blocks[index] == Block.Air && blocks[index - oneY] == Block.Stone)
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blocks[index] = type;
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}
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}
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}
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}
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void PlantTrees() {
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int numPatches = width * length / 4000;
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CurrentState = "Planting tress";
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for (int i = 0; i < numPatches; i++) {
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CurrentProgress = (float)i / numPatches;
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int patchX = rnd.Next(width), patchZ = rnd.Next(length);
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for (int j = 0; j < 20; j++) {
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int treeX = patchX, treeZ = patchZ;
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for (int k = 0; k < 20; k++) {
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treeX += rnd.Next(6) - rnd.Next(6);
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treeZ += rnd.Next(6) - rnd.Next(6);
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if (treeX < 0 || treeZ < 0 || treeX >= width ||
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treeZ >= length || rnd.NextFloat() >= 0.25)
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continue;
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int treeY = heightmap[treeZ * width + treeX] + 1;
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int treeHeight = 5 + rnd.Next(3);
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if (CanGrowTree(treeX, treeY, treeZ, treeHeight)) {
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GrowTree(treeX, treeY, treeZ, treeHeight);
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}
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}
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}
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}
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}
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bool CanGrowTree(int treeX, int treeY, int treeZ, int treeHeight) {
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// check tree base
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int baseHeight = treeHeight - 4;
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for (int y = treeY; y < treeY + baseHeight; y++)
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for (int z = treeZ - 1; z <= treeZ + 1; z++)
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for (int x = treeX - 1; x <= treeX + 1; x++)
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{
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if (x < 0 || y < 0 || z < 0 || x >= width || y >= height || z >= length)
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return false;
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int index = (y * length + z) * width + x;
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if (blocks[index] != 0) return false;
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}
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// and also check canopy
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for (int y = treeY + baseHeight; y < treeY + treeHeight; y++)
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for (int z = treeZ - 2; z <= treeZ + 2; z++)
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for (int x = treeX - 2; x <= treeX + 2; x++)
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{
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if (x < 0 || y < 0 || z < 0 || x >= width || y >= height || z >= length)
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return false;
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int index = (y * length + z) * width + x;
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if (blocks[index] != 0) return false;
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}
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return true;
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}
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void GrowTree(int treeX, int treeY, int treeZ, int height) {
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int baseHeight = height - 4;
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int index = 0;
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// leaves bottom layer
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for (int y = treeY + baseHeight; y < treeY + baseHeight + 2; y++)
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for (int zz = -2; zz <= 2; zz++)
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for (int xx = -2; xx <= 2; xx++)
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{
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int x = xx + treeX, z = zz + treeZ;
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index = (y * length + z) * width + x;
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if (Math.Abs(xx) == 2 && Math.Abs(zz) == 2) {
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if (rnd.NextFloat() >= 0.5)
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blocks[index] = Block.Leaves;
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} else {
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blocks[index] = Block.Leaves;
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}
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}
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// leaves top layer
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int bottomY = treeY + baseHeight + 2;
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for (int y = treeY + baseHeight + 2; y < treeY + height; y++)
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for (int zz = -1; zz <= 1; zz++)
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for (int xx = -1; xx <= 1; xx++)
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{
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int x = xx + treeX, z = zz + treeZ;
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index = (y * length + z) * width + x;
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if (xx == 0 || zz == 0) {
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blocks[index] = Block.Leaves;
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} else if (y == bottomY && rnd.NextFloat() >= 0.5) {
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blocks[index] = Block.Leaves;
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}
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}
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// then place trunk
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index = (treeY * length + treeZ) * width + treeX;
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for (int y = 0; y < height - 1; y++) {
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blocks[index] = Block.Log;
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index += oneY;
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}
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}
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}
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} |