367 lines
12 KiB
C#
367 lines
12 KiB
C#
using System.Collections.Concurrent;
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using System.Linq;
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using OpenTK.Mathematics;
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using Serilog;
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using VoxelEngine.Core;
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using VoxelEngine.World.Blocks;
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using VoxelEngine.World.Chunk;
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using VoxelEngine.World.WorldGen;
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using VoxelChunk = VoxelEngine.World.Chunk.Chunk;
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namespace VoxelEngine.World.Streaming;
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public sealed class ChunkStreamer : IDisposable
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{
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private static readonly ILogger Log = Serilog.Log.ForContext<ChunkStreamer>();
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private readonly Configuration _cfg;
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private readonly IWorld _world;
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private readonly Func<Vector3i, VoxelChunk> _generate;
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private readonly IChunkMesher _mesher;
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private readonly BlockRegistry _registry;
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private readonly IJobExecutor _executor;
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private readonly Func<float[], IChunkRenderer> _rendererFactory;
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private readonly Dictionary<Vector3i, IChunkRenderer> _renderers = new();
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private readonly HashSet<Vector3i> _tracked = new();
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private readonly HashSet<Vector3i> _ready = new();
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private readonly HashSet<Vector3i> _dirty = new();
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private readonly PriorityQueue<Vector3i, int> _pendingLoad = new();
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private readonly ConcurrentQueue<ChunkJobResult> _completed = new();
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private readonly Queue<Vector3i> _pendingUnload = new();
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private Vector3i _lastPlayerChunk = new(int.MinValue, int.MinValue, int.MinValue);
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private int _inFlight;
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private bool _spawnReady;
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private bool _spawnAnchorSet;
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private Vector3i _spawnAnchor;
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public int RendererCount => this._renderers.Count;
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public bool IsReady(Vector3i pos) => this._ready.Contains(pos);
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public bool SpawnReady => this._spawnReady;
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public void MarkDirty(Vector3i chunkPos)
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{
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if (!this._ready.Contains(chunkPos)) return;
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this._dirty.Add(chunkPos);
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}
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public ChunkStreamer(
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Configuration cfg,
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IWorld world,
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Func<Vector3i, VoxelChunk> generate,
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IChunkMesher mesher,
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BlockRegistry registry,
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IJobExecutor executor,
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Func<float[], IChunkRenderer> rendererFactory)
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{
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this._cfg = cfg;
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this._world = world;
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this._generate = generate;
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this._mesher = mesher;
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this._registry = registry;
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this._executor = executor;
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this._rendererFactory = rendererFactory;
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}
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public void Tick(Vector3i playerChunkPos)
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{
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if (playerChunkPos != this._lastPlayerChunk)
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{
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this.RecomputeTargetSet(playerChunkPos);
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this._lastPlayerChunk = playerChunkPos;
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}
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// Unloads first to free in-flight slots, then dispatch BEFORE drain:
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// with a synchronous executor (tests), Submit() runs work to completion
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// before returning, so a single tick must drain its own dispatches.
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// With the production threadpool executor, jobs don't finish in this
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// tick -- Drain harvests results submitted on previous ticks. Either
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// way this ordering is correct.
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this.ProcessUnloads();
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this.DispatchJobs();
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this.DrainCompleted();
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this.UpdateSpawnReady();
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}
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public void DrawAll(Action<Vector3i, IChunkRenderer> drawCallback)
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{
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foreach (var kvp in this._renderers) drawCallback(kvp.Key, kvp.Value);
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}
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public void Dispose()
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{
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foreach (var r in this._renderers.Values) r.Dispose();
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this._renderers.Clear();
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}
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private void RecomputeTargetSet(Vector3i p)
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{
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if (!this._spawnAnchorSet)
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{
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this._spawnAnchor = p;
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this._spawnAnchorSet = true;
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}
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int h = this._cfg.RenderDistanceHorizontal;
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int v = this._cfg.RenderDistanceVertical;
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var target = new HashSet<Vector3i>();
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for (int dx = -h; dx <= h; dx++)
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for (int dy = -v; dy <= v; dy++)
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for (int dz = -h; dz <= h; dz++)
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{
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int cy = p.Y + dy;
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if (cy < 0 || cy >= WorldConstants.WorldHeightChunks) continue;
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target.Add(new Vector3i(p.X + dx, cy, p.Z + dz));
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}
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foreach (var pos in target)
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{
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if (this._tracked.Add(pos))
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{
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int priority = (pos.X - p.X) * (pos.X - p.X)
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+ (pos.Y - p.Y) * (pos.Y - p.Y)
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+ (pos.Z - p.Z) * (pos.Z - p.Z);
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this._pendingLoad.Enqueue(pos, priority);
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}
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}
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// Anything currently tracked but no longer in target → unload.
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var toRemove = new List<Vector3i>();
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foreach (var tracked in this._tracked)
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{
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if (!target.Contains(tracked)) toRemove.Add(tracked);
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}
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foreach (var pos in toRemove)
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{
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this._tracked.Remove(pos);
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this._pendingUnload.Enqueue(pos);
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}
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}
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private void DrainCompleted()
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{
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int budget = this._cfg.MaxMeshUploadsPerFrame;
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while (budget > 0 && this._completed.TryDequeue(out ChunkJobResult? result))
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{
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this._inFlight--;
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budget--;
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this.InstallResult(result);
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}
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}
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private void ProcessUnloads()
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{
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while (this._pendingUnload.TryDequeue(out Vector3i pos))
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{
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if (this._renderers.TryGetValue(pos, out IChunkRenderer? renderer))
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{
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renderer.Dispose();
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this._renderers.Remove(pos);
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}
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this._world.RemoveChunk(pos);
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this._ready.Remove(pos);
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Log.Debug("Unloaded {Pos}", pos);
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}
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}
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private void UpdateSpawnReady()
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{
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if (this._spawnReady || !this._spawnAnchorSet) return;
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int hs = this._cfg.SpawnReadyRadiusHorizontal;
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int v = this._cfg.RenderDistanceVertical;
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Vector3i a = this._spawnAnchor;
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for (int dx = -hs; dx <= hs; dx++)
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for (int dy = -v; dy <= v; dy++)
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for (int dz = -hs; dz <= hs; dz++)
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{
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int cy = a.Y + dy;
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if (cy < 0 || cy >= WorldConstants.WorldHeightChunks) continue;
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if (!this._ready.Contains(new Vector3i(a.X + dx, cy, a.Z + dz))) return;
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}
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this._spawnReady = true;
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Log.Information("Spawn area ready at anchor {Anchor}", a);
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}
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private void InstallResult(ChunkJobResult result)
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{
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if (result.Error != null || result.Mesh == null)
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{
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Log.Error(result.Error, "Chunk {Pos} failed to load", result.Pos);
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return;
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}
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if (!result.IsRemeshOnly)
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{
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if (result.Chunk == null) { Log.Error("Load result for {Pos} had null chunk", result.Pos); return; }
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this._world.SetChunk(result.Pos, result.Chunk);
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}
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if (this._renderers.TryGetValue(result.Pos, out IChunkRenderer? old))
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{
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old.Dispose();
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}
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this._renderers[result.Pos] = this._rendererFactory(result.Mesh);
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this._ready.Add(result.Pos);
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this._dirty.Remove(result.Pos);
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if (!result.IsRemeshOnly)
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{
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this.MarkCardinalNeighborsDirty(result.Pos);
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Log.Debug("Loaded {Pos}", result.Pos);
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}
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else
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{
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Log.Debug("Remeshed {Pos}", result.Pos);
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}
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}
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private void MarkCardinalNeighborsDirty(Vector3i pos)
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{
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Vector3i[] offsets =
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{
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new(-1, 0, 0), new(1, 0, 0),
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new(0, -1, 0), new(0, 1, 0),
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new(0, 0, -1), new(0, 0, 1),
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};
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foreach (var off in offsets)
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{
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var neighbor = pos + off;
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if (this._ready.Contains(neighbor)) this._dirty.Add(neighbor);
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}
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}
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private void DispatchJobs()
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{
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// Dirty re-meshes first (correctness), then new loads (player view).
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while (this._inFlight < this._cfg.MaxGenerateJobsInFlight && this._dirty.Count > 0)
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{
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Vector3i pos = this._dirty.First();
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this._dirty.Remove(pos);
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this.DispatchRemesh(pos);
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}
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while (this._inFlight < this._cfg.MaxGenerateJobsInFlight && this._pendingLoad.Count > 0)
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{
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Vector3i pos = this._pendingLoad.Dequeue();
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this.DispatchLoad(pos);
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}
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}
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private void DispatchRemesh(Vector3i pos)
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{
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VoxelChunk? chunk = this._world.GetChunk(pos);
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if (chunk == null) return; // got unloaded between MarkDirty and now
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NeighborSnapshots neighbors = this.SnapshotNeighbors(pos);
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VoxelChunk snapshotChunk = ChunkStreamer.CopyChunk(chunk); // worker reads from copy
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this._inFlight++;
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IChunkMesher mesher = this._mesher;
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BlockRegistry registry = this._registry;
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var completed = this._completed;
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this._executor.Submit(() =>
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{
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try
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{
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float[] mesh = mesher.Build(snapshotChunk, registry, (nx, ny, nz) =>
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neighbors.IsOpaqueOutside(nx, ny, nz, id => registry.Get(id).IsOpaque));
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completed.Enqueue(new ChunkJobResult(pos, snapshotChunk, mesh, Error: null, IsRemeshOnly: true));
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}
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catch (Exception ex)
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{
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completed.Enqueue(new ChunkJobResult(pos, Chunk: null, Mesh: null, Error: ex, IsRemeshOnly: true));
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}
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});
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}
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private static VoxelChunk CopyChunk(VoxelChunk source)
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{
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var copy = new VoxelChunk();
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for (int x = 0; x < VoxelChunk.Size; x++)
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for (int y = 0; y < VoxelChunk.Size; y++)
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for (int z = 0; z < VoxelChunk.Size; z++)
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{
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copy[x, y, z] = source[x, y, z];
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}
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return copy;
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}
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private void DispatchLoad(Vector3i pos)
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{
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NeighborSnapshots neighbors = this.SnapshotNeighbors(pos);
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IReadOnlyDictionary<int, ushort>? diff = null;
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if (this._world.ModificationStore.TryGetDiff(pos, out var d) && d != null)
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{
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// Copy: TryGetDiff returns the live internal dictionary, which the
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// main thread may mutate via World.SetBlock while the worker iterates.
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diff = new Dictionary<int, ushort>(d);
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}
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var job = new ChunkJob(pos, ExistingChunk: null, neighbors, diff);
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this._inFlight++;
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IChunkMesher mesher = this._mesher;
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BlockRegistry registry = this._registry;
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var generate = this._generate;
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var completed = this._completed;
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this._executor.Submit(() =>
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{
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try
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{
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VoxelChunk chunk = generate(job.Pos);
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if (job.Diff != null)
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{
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foreach (var (idx, id) in job.Diff)
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{
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int lx = idx / (VoxelChunk.Size * VoxelChunk.Size);
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int ly = (idx / VoxelChunk.Size) % VoxelChunk.Size;
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int lz = idx % VoxelChunk.Size;
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chunk[lx, ly, lz] = id;
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}
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}
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float[] mesh = mesher.Build(chunk, registry, (nx, ny, nz) =>
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job.Neighbors.IsOpaqueOutside(nx, ny, nz, id => registry.Get(id).IsOpaque));
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completed.Enqueue(new ChunkJobResult(job.Pos, chunk, mesh, Error: null, IsRemeshOnly: false));
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}
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catch (Exception ex)
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{
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completed.Enqueue(new ChunkJobResult(job.Pos, Chunk: null, Mesh: null, Error: ex, IsRemeshOnly: false));
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}
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});
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}
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private NeighborSnapshots SnapshotNeighbors(Vector3i pos)
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{
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ushort[]? Snap(Vector3i p)
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{
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VoxelChunk? c = this._world.GetChunk(p);
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if (c == null) return null;
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var copy = new ushort[VoxelChunk.Size * VoxelChunk.Size * VoxelChunk.Size];
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for (int x = 0; x < VoxelChunk.Size; x++)
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for (int y = 0; y < VoxelChunk.Size; y++)
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for (int z = 0; z < VoxelChunk.Size; z++)
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{
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copy[(x * VoxelChunk.Size + y) * VoxelChunk.Size + z] = c[x, y, z];
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}
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return copy;
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}
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return new NeighborSnapshots(
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negX: Snap(pos + new Vector3i(-1, 0, 0)),
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posX: Snap(pos + new Vector3i(1, 0, 0)),
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negY: Snap(pos + new Vector3i(0, -1, 0)),
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posY: Snap(pos + new Vector3i(0, 1, 0)),
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negZ: Snap(pos + new Vector3i(0, 0, -1)),
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posZ: Snap(pos + new Vector3i(0, 0, 1)));
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}
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}
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