riversong code showcase

Source/Riversong/Game/WorldGen/ChunkGenerators/GrassChunkMeshGenerator.cs

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+using Unity.Collections;
+using Unity.Jobs;
+using Unity.Mathematics;
+using UnityEngine;
+using UnityEngine.Rendering;
+using Random = Unity.Mathematics.Random;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public class GrassChunkMeshGenerator : GrassChunkMeshGeneratorBase<GrassTileMask>
+    {
+        public GrassChunkMeshGenerator(World world, GameConfig config) : base(world, config)
+        {
+        }
+
+        protected override int GetLodCount()
+        {
+            return Config.Terrain.GrassLODs.Length;
+        }
+
+        protected override string GetGameObjectName(string chunkName, int2 chunkCoords, int lod)
+        {
+            return $"{chunkName}_Grass_LOD{lod}";
+        }
+
+        protected override void InitializeChunk(TerrainChunk chunk, int lod, GameObject gameObject, Mesh mesh, Renderer renderer)
+        {
+            base.InitializeChunk(chunk, lod, gameObject, mesh, renderer);
+
+            renderer.shadowCastingMode = ShadowCastingMode.Off;
+
+            chunk.GrassLODs[lod] = new TerrainChunk.RenderData(mesh, renderer);
+        }
+
+        protected override Mesh GetMesh(TerrainChunk chunk, int lod)
+        {
+            return chunk.GrassLODs[lod].Mesh;
+        }
+
+        protected override JobHandle ScheduleJob(ChunkGenerationJobState jobState, NativeArray<int2> chunkCoords, NativeArray<Random> randomArray)
+        {
+            var job = new GenerateGrassChunkJob<GrassTileMask>();
+            PrepareJob(jobState, chunkCoords, randomArray, jobState.Lod, ref job);
+            return job.Schedule(chunkCoords.Length, Config.WorldGen.ChunksPerThread);
+        }
+
+        protected override Renderer GetRenderer(TerrainChunk chunk, int lod)
+        {
+            return chunk.GrassLODs[lod].Renderer;
+        }
+
+        protected override Material GetMaterial(int lod)
+        {
+            return Config.Terrain.GrassMaterial;
+        }
+
+        protected override GameConfig.WorldGenConfig.GrassConfig GetGrassGenerationConfig()
+        {
+            return Config.WorldGen.Grass;
+        }
+
+        protected override GrassTileMask GetMask()
+        {
+            var heightmap = World.Heightmap.GetNativeArray();
+            var fertility = World.Fertility.GetNativeArray();
+            return new GrassTileMask
+            {
+                Heightmap = heightmap,
+                Fertility = fertility
+            };
+        }
+
+        protected override int GetDensityForLOD(int lod)
+        {
+            return Config.Terrain.GrassLODs[lod].Density;
+        }
+    }
+}