feat: add Plains/Desert/Mountains/Forest biomes and registry

World/WorldGen/Biomes/PlainsBiome.cs

@@ -0,0 +1,25 @@
+using VoxelEngine.World.Blocks;
+
+namespace VoxelEngine.World.WorldGen.Biomes;
+
+public sealed class PlainsBiome : IBiome
+{
+    private readonly FastNoiseLite _detail;
+
+    public string Name => "Plains";
+    public SurfacePalette Surface { get; }
+
+    public PlainsBiome(int seed, BlockRegistry blocks)
+    {
+        this._detail = new FastNoiseLite(seed + 100);
+        this._detail.SetNoiseType(FastNoiseLite.NoiseType.OpenSimplex2);
+        this._detail.SetFrequency(0.02f);
+        this.Surface = new SurfacePalette(blocks.Grass, blocks.Dirt, blocks.Stone);
+    }
+
+    public float SampleHeight(NoiseSource noise, float worldX, float worldZ)
+        => WorldConstants.SeaLevel + 6f * noise.Continent(worldX, worldZ)
+                                   + 2f * this._detail.GetNoise(worldX, worldZ);
+
+    public IBlock TopBlock(int worldY) => this.Surface.Top;
+}