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using System;
using Microsoft.Xna.Framework;
using Celesteia.Resources;
using System.Collections.Generic;
using System.Linq;
namespace Celesteia.Game.Planets.Generation {
public class TerranPlanetGenerator : IChunkProvider {
private ChunkMap _chunkMap;
private int _seed;
private FastNoiseLite _noise;
public TerranPlanetGenerator(GeneratedPlanet chunkMap) {
_chunkMap = chunkMap;
_noise = new FastNoiseLite(_seed = chunkMap.Seed);
LoadBlockIndices();
}
private byte top;
private byte soil;
private byte stone;
private byte deepstone;
private byte log;
private byte leaves;
private byte planks;
private byte coal_ore;
private byte copper_ore;
private byte iron_ore;
private byte[] foliage;
private byte landing_floor;
private byte cc_base;
private byte cc_frame;
private void LoadBlockIndices() {
top = ResourceManager.Blocks.GetResource(NamespacedKey.Base("grown_soil")).GetID();
soil = ResourceManager.Blocks.GetResource(NamespacedKey.Base("soil")).GetID();
stone = ResourceManager.Blocks.GetResource(NamespacedKey.Base("stone")).GetID();
deepstone = ResourceManager.Blocks.GetResource(NamespacedKey.Base("deepstone")).GetID();
log = ResourceManager.Blocks.GetResource(NamespacedKey.Base("log")).GetID();
leaves = ResourceManager.Blocks.GetResource(NamespacedKey.Base("leaves")).GetID();
planks = ResourceManager.Blocks.GetResource(NamespacedKey.Base("wooden_planks")).GetID();
coal_ore = ResourceManager.Blocks.GetResource(NamespacedKey.Base("coal_ore")).GetID();
copper_ore = ResourceManager.Blocks.GetResource(NamespacedKey.Base("copper_ore")).GetID();
iron_ore = ResourceManager.Blocks.GetResource(NamespacedKey.Base("iron_ore")).GetID();
foliage = new byte[5] {
0,
ResourceManager.Blocks.GetResource(NamespacedKey.Base("grass")).GetID(),
ResourceManager.Blocks.GetResource(NamespacedKey.Base("blue_flower")).GetID(),
ResourceManager.Blocks.GetResource(NamespacedKey.Base("red_flower")).GetID(),
ResourceManager.Blocks.GetResource(NamespacedKey.Base("violet_flower")).GetID()
};
landing_floor = ResourceManager.Blocks.GetResource(NamespacedKey.Base("scorched_soil")).GetID();
cc_base = ResourceManager.Blocks.GetResource(NamespacedKey.Base("crashed_capsule_base")).GetID();
cc_frame = ResourceManager.Blocks.GetResource(NamespacedKey.Base("crashed_capsule_frame")).GetID();
}
public void ProvideChunk(Chunk c) {
byte[] natural;
for (int i = 0; i < Chunk.CHUNK_SIZE; i++)
for (int j = 0; j < Chunk.CHUNK_SIZE; j++) {
natural = GetNaturalBlocks(c.TruePosition.X + i, c.TruePosition.Y + j);
c.SetForeground(i, j, natural[0]);
c.SetBackground(i, j, natural[1]);
}
}
public byte[] GetNaturalBlocks(int x, int y) => ThirdPass(x, y, SecondPass(x, y, FirstPass(x, y)));
public void GenerateStructures(Action<string> progressReport) {
Random rand = new Random(_seed);
progressReport("Planting trees...");
GenerateTrees(rand);
progressReport("Abandoning houses...");
GenerateAbandonedHomes(rand);
progressReport("Planting foliage...");
GenerateFoliage(rand);
progressReport("Landing light...");
GenerateLanding();
}
public Vector2 GetSpawnpoint()
{
float x;
return new Vector2(
x = MathF.Floor(_chunkMap.BlockWidth / 2f) + 0.5f,
(_chunkMap.BlockHeight) - GetHeightValue((int)MathF.Floor(x)) - 2f
);
}
public byte[] FirstPass(int x, int y) {
if (y > _chunkMap.BlockHeight - 5) return new byte[2] { deepstone, deepstone };
byte[] values = new byte[2] { 0, 0 };
int h = GetHeightValue(x);
if (_chunkMap.BlockHeight - y <= h) {
if (_chunkMap.BlockHeight - y == h) { values[0] = top; values[1] = soil; }
else if (_chunkMap.BlockHeight - y >= h - 3) { values[0] = soil; values[1] = soil; }
else { values[0] = stone; values[1] = stone; }
}
return values;
}
public byte[] SecondPass(int x, int y, byte[] values) {
float threshold = 0.667f;
if (values[0] == 0 || values[0] == deepstone) return values;
if (values[0] == soil || values[0] == top) threshold += .2f;
float c = GetCaveValue(x, y);
if (c > threshold) values[0] = 0;
return values;
}
public byte[] ThirdPass(int x, int y, byte[] values) {
if (values[0] != stone) return values;
float coalValue = GetOreValue(x, y, 498538f, 985898f);
if (coalValue > 0.95f) values[0] = coal_ore;
else {
float copperValue = GetOreValue(x, y, 3089279f, 579486f);
if (copperValue > 0.95f) values[0] = copper_ore;
else
{
float ironValue = GetOreValue(x, y, 243984f, 223957f);
if (ironValue > 0.95f) values[0] = iron_ore;
}
}
return values;
}
private int defaultOffset => _chunkMap.BlockHeight / 3;
public int GetHeightValue(int x) => (int)Math.Round((_noise.GetNoise(x / 1f, 0f) * 24f) + defaultOffset);
public float GetCaveValue(int x, int y) => _noise.GetNoise(x / 0.6f, y / 0.7f);
public float GetOreValue(int x, int y, float offsetX, float offsetY) => (_noise.GetNoise((x + offsetX) * 5f, (y + offsetY) * 5f) + 1) / 2f;
private int blocksBetweenTrees = 5;
private int treeGrowthSteps = 15;
public void GenerateTrees(Random rand) {
int j = 0;
int randomNumber = 0;
int lastTree = 0;
for (int i = 0; i < _chunkMap.BlockWidth; i++) {
j = _chunkMap.BlockHeight - GetHeightValue(i);
if (MathF.Abs(i - GetSpawnpoint().X) < 10f) continue; // Don't grow trees too close to spawn.
if (i < 10 || i > _chunkMap.BlockWidth - 10) continue; // Don't grow trees too close to world borders.
if (_chunkMap.GetForeground(i, j).BlockID != top) continue; // Only grow trees on grass.
if (i - lastTree < blocksBetweenTrees) continue; // Force a certain number of blocks between trees.
lastTree = i;
randomNumber = rand.Next(0, 6);
if (randomNumber == 1) GrowTreeRecursively(i, j - 1, treeGrowthSteps - rand.Next(0, 7), rand, false);
}
}
public void GrowTreeRecursively(int x, int y, int steps, Random rand, bool branch) {
if (steps == 0) {
for (int i = -2; i <= 2; i++)
for (int j = -2; j <= 2; j++) {
if (_chunkMap.GetForeground(x + i, y + j).Empty) _chunkMap.SetForegroundID(x + i, y + j, leaves);
}
return;
}
if (!_chunkMap.GetForeground(x, y).Empty) return;
_chunkMap.SetForegroundID(x, y, log);
if (!branch) GrowTreeRecursively(x, y - 1, steps - 1, rand, false); // Grow upwards.
if (rand.Next(0, 6) > steps) GrowTreeRecursively(x - 1, y, steps - 1, rand, true); // Grow to the left.
if (rand.Next(0, 6) > steps) GrowTreeRecursively(x + 1, y, steps - 1, rand, true); // Grow to the right.
}
private int blocksBetweenHomes = 150;
public void GenerateAbandonedHomes(Random rand) {
int j = 0;
int randomNumber = 0;
int lastHome = 0;
for (int i = 0; i < _chunkMap.BlockWidth; i++) {
j = _chunkMap.BlockHeight - GetHeightValue(i);
if (MathF.Abs(i - GetSpawnpoint().X) < 10f) continue; // Don't grow trees too close to spawn.
if (i < 10 || i > _chunkMap.BlockWidth - 10) continue; // Don't grow trees too close to world borders.
if (i - lastHome < blocksBetweenHomes) continue; // Force a certain number of blocks between trees.
int homeWidth = rand.Next(10, 15);
int homeHeight = rand.Next(6, 10);
int buryAmount = rand.Next(15, 40);
j -= homeHeight; // Raise the home to be built on the ground first.
j += buryAmount; // Bury the home by a random amount.
lastHome = i;
randomNumber = rand.Next(0, 5);
if (randomNumber == 1) BuildAbandonedHome(i, j, homeWidth, homeHeight, rand);
}
}
public void BuildAbandonedHome(int originX, int originY, int homeWidth, int homeHeight, Random rand) {
int maxX = originX + homeWidth;
for (int i = originX; i < maxX; i++) originY = Math.Max(originY, _chunkMap.BlockHeight - GetHeightValue(i));
int maxY = originY + homeHeight;
for (int i = originX; i < maxX; i++)
for (int j = originY; j < maxY; j++) {
_chunkMap.SetBackgroundID(i, j, planks);
_chunkMap.SetForegroundID(i, j, 0);
// Apply some random decay by skipping tiles at random.
if (rand.Next(0, 5) > 3) {
continue;
}
if (j == originY || j == maxY - 1) _chunkMap.SetForegroundID(i, j, planks);
if (i == originX || i == maxX - 1) _chunkMap.SetForegroundID(i, j, log);
}
}
private Dictionary<double, int> foliageDistribution = new Dictionary<double, int> {
{ 0.3, 0 },
{ 0.6, 1 },
{ 0.7, 2 },
{ 0.85, 4 },
{ 0.99, 3 },
};
public void GenerateFoliage(Random rand) {
int j = 0;
double randomNumber = 0;
int foliageIndex = 0;
for (int i = 0; i < _chunkMap.BlockWidth; i++) {
j = _chunkMap.BlockHeight - GetHeightValue(i);
if (_chunkMap.GetForeground(i, j).BlockID != top) continue; // If there is anything but foreground grown soil, continue.
if (!_chunkMap.GetForeground(i, j - 1).Empty) continue; // If the foreground is already taken, continue.
randomNumber = rand.NextDouble();
for (int f = 0; f < foliageDistribution.Keys.Count; f++) {
if (randomNumber > foliageDistribution.Keys.ElementAt(f)) foliageIndex = foliageDistribution[foliageDistribution.Keys.ElementAt(f)];
}
_chunkMap.SetForegroundID(i, j - 1, foliage[foliageIndex]);
}
}
public void GenerateLanding() {
int x = GetSpawnpoint().ToPoint().X;
int j = _chunkMap.BlockHeight - GetHeightValue(x);
for (int i = -1; i <= 1; i++) {
_chunkMap.SetForegroundID(x + i, j + 1, soil);
_chunkMap.SetForegroundID(x + i, j, landing_floor);
for (int h = 1; h <= 3; h++) {
_chunkMap.SetForegroundID(x + i, j - h, cc_frame);
_chunkMap.SetBackgroundID(x + i, j - h, 0);
}
}
_chunkMap.SetForegroundID(x, j - 1, cc_base);
}
}
}
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