feat: add WorldGenerator filling vertical chunk stacks

2026-05-31 22:08:41 +02:00
parent 6196b38cc8
commit 03cf0ceb07
2 changed files with 131 additions and 0 deletions
--- a/World/WorldGen/WorldGenerator.cs
+++ b/World/WorldGen/WorldGenerator.cs
@@ -0,0 +1,61 @@
+using OpenTK.Mathematics;
+using VoxelEngine.World.Blocks;
+using VoxelChunk = VoxelEngine.World.Chunk.Chunk;
+
+namespace VoxelEngine.World.WorldGen;
+
+public sealed class WorldGenerator
+{
+    private const int FillerDepth = 3;
+    private const float CellSize = 96f;
+
+    private readonly BlockRegistry _blocks;
+    private readonly BiomeMap _biomeMap;
+    private readonly TerrainSampler _terrain;
+
+    public WorldGenerator(int seed, BlockRegistry blocks)
+    {
+        this._blocks = blocks;
+        NoiseSource noise = new(seed);
+        VoronoiCells cells = new(seed, WorldGenerator.CellSize);
+        BiomeRegistry biomes = new(seed, blocks);
+        this._biomeMap = new BiomeMap(noise, cells, biomes);
+        this._terrain = new TerrainSampler(noise, this._biomeMap);
+    }
+
+    public VoxelChunk Generate(Vector3i chunkPos)
+    {
+        VoxelChunk chunk = new();
+        int baseX = chunkPos.X * VoxelChunk.Size;
+        int baseY = chunkPos.Y * VoxelChunk.Size;
+        int baseZ = chunkPos.Z * VoxelChunk.Size;
+
+        for (int x = 0; x < VoxelChunk.Size; x++)
+        for (int z = 0; z < VoxelChunk.Size; z++)
+        {
+            int worldX = baseX + x;
+            int worldZ = baseZ + z;
+            int height = this._terrain.HeightAt(worldX, worldZ);
+            IBiome biome = this._biomeMap.BiomeAt(worldX, worldZ);
+
+            for (int y = 0; y < VoxelChunk.Size; y++)
+            {
+                int worldY = baseY + y;
+                chunk[x, y, z] = WorldGenerator.BlockAt(worldY, height, biome, this._blocks);
+            }
+        }
+        return chunk;
+    }
+
+    // Pure column fill rule, extracted for testability.
+    public static ushort BlockAt(int worldY, int surfaceHeight, IBiome biome, BlockRegistry blocks)
+    {
+        if (worldY > surfaceHeight)
+            return worldY <= WorldConstants.SeaLevel ? blocks.Water.Id : blocks.Air.Id;
+        if (worldY == surfaceHeight)
+            return biome.TopBlock(worldY).Id;
+        if (worldY >= surfaceHeight - WorldGenerator.FillerDepth)
+            return biome.Surface.Filler.Id;
+        return biome.Surface.Under.Id;
+    }
+}