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

World/WorldGen/Biomes/MountainsBiome.cs

@@ -0,0 +1,32 @@
+using VoxelEngine.World.Blocks;
+
+namespace VoxelEngine.World.WorldGen.Biomes;
+
+public sealed class MountainsBiome : IBiome
+{
+    private const int SnowLine = 96;
+    private readonly FastNoiseLite _ridged;
+    private readonly IBlock _stone;
+    private readonly IBlock _snow;
+
+    public string Name => "Mountains";
+    public SurfacePalette Surface { get; }
+
+    public MountainsBiome(int seed, BlockRegistry blocks)
+    {
+        this._ridged = new FastNoiseLite(seed + 102);
+        this._ridged.SetNoiseType(FastNoiseLite.NoiseType.OpenSimplex2);
+        this._ridged.SetFractalType(FastNoiseLite.FractalType.Ridged);
+        this._ridged.SetFractalOctaves(4);
+        this._ridged.SetFrequency(0.01f);
+        this._stone = blocks.Stone;
+        this._snow = blocks.Snow;
+        this.Surface = new SurfacePalette(blocks.Stone, blocks.Stone, blocks.Stone);
+    }
+
+    public float SampleHeight(NoiseSource noise, float worldX, float worldZ)
+        => WorldConstants.SeaLevel + 10f * noise.Continent(worldX, worldZ)
+                                   + 45f * this._ridged.GetNoise(worldX, worldZ);
+
+    public IBlock TopBlock(int worldY) => worldY >= MountainsBiome.SnowLine ? this._snow : this._stone;
+}