Batch block updates (#1313)

* Batch block updates

* Apply review change requests

* Allow blockUpdate to carry multiple block updates in single message

* Read until there is nothing left

* Use mesh_storage.BlockUpdate

* Break instead of boolean

* Restore client side neighbor updates

* Move side check in blockUpdate out of the loop

* Update src/utils.zig

* Fix minor issues

* Reverse ownership logic + change contains into liesInChunk

* Update liesInChunk

* No name for upadeBlock param

* Apply review change requests

* Fix formatting

* Restore onBreakClient where it should be

* Update src/renderer/chunk_meshing.zig

* Update src/renderer/chunk_meshing.zig

* Converge formatting with master

* fix formatting (https://github.com/ziglang/zig-spec/issues/38 is so stupid)

---------

Co-authored-by: IntegratedQuantum <jahe788@gmail.com>

src/Inventory.zig

@@ -1654,7 +1654,8 @@ pub const Command = struct { // MARK: Command
 			}) {
 				if(side == .server) {
 					// Inform the client of the actual block:
-					main.network.Protocols.blockUpdate.send(user.?.conn, self.pos[0], self.pos[1], self.pos[2], main.server.world.?.getBlock(self.pos[0], self.pos[1], self.pos[2]) orelse return);
+					const actualBlock = main.server.world.?.getBlock(self.pos[0], self.pos[1], self.pos[2]) orelse return;
+					main.network.Protocols.blockUpdate.send(user.?.conn, &.{.init(self.pos, actualBlock)});
 				}
 				return;
 			}
@@ -1662,7 +1663,7 @@ pub const Command = struct { // MARK: Command
 			if(side == .server) {
 				if(main.server.world.?.cmpxchgBlock(self.pos[0], self.pos[1], self.pos[2], self.oldBlock, self.newBlock)) |actualBlock| {
 					// Inform the client of the actual block:
-					main.network.Protocols.blockUpdate.send(user.?.conn, self.pos[0], self.pos[1], self.pos[2], actualBlock);
+					main.network.Protocols.blockUpdate.send(user.?.conn, &.{.init(self.pos, actualBlock)});
 					return error.serverFailure;
 				}
 			}

src/chunk.zig

@@ -141,6 +141,7 @@ pub fn getIndex(x: i32, y: i32, z: i32) u32 {
 	std.debug.assert((x & chunkMask) == x and (y & chunkMask) == y and (z & chunkMask) == z);
 	return (@as(u32, @intCast(x)) << chunkShift2) | (@as(u32, @intCast(y)) << chunkShift) | @as(u32, @intCast(z));
 }
+
 /// Gets the x coordinate from a given index inside this chunk.
 fn extractXFromIndex(index: usize) i32 {
 	return @intCast(index >> chunkShift2 & chunkMask);
@@ -303,6 +304,11 @@ pub const Chunk = struct { // MARK: Chunk
 		return self.data.getValue(index);
 	}
 
+	/// Checks if the given relative coordinates lie within the bounds of this chunk.
+	pub fn liesInChunk(self: *const Chunk, x: i32, y: i32, z: i32) bool {
+		return x >= 0 and x < self.width and y >= 0 and y < self.width and z >= 0 and z < self.width;
+	}
+
 	pub fn getLocalBlockIndex(self: *const Chunk, worldPos: Vec3i) u32 {
 		return getIndex(
 			(worldPos[0] - self.pos.wx) >> self.voxelSizeShift,
@@ -376,7 +382,7 @@ pub const ServerChunk = struct { // MARK: ServerChunk
 
 	/// Checks if the given relative coordinates lie within the bounds of this chunk.
 	pub fn liesInChunk(self: *const ServerChunk, x: i32, y: i32, z: i32) bool {
-		return x >= 0 and x < self.super.width and y >= 0 and y < self.super.width and z >= 0 and z < self.super.width;
+		return self.super.liesInChunk(x, y, z);
 	}
 
 	/// This is useful to convert for loops to work for reduced resolution:

src/network.zig

@@ -20,6 +20,7 @@ const Vec3d = vec.Vec3d;
 const Vec3f = vec.Vec3f;
 const Vec3i = vec.Vec3i;
 const NeverFailingAllocator = main.heap.NeverFailingAllocator;
+const BlockUpdate = renderer.mesh_storage.BlockUpdate;
 
 //TODO: Might want to use SSL or something similar to encode the message
 
@@ -943,23 +944,28 @@ pub const Protocols = struct {
 		pub const id: u8 = 7;
 		pub const asynchronous = false;
 		fn receive(conn: *Connection, reader: *utils.BinaryReader) !void {
-			const x = try reader.readInt(i32);
-			const y = try reader.readInt(i32);
-			const z = try reader.readInt(i32);
-			const newBlock = Block.fromInt(try reader.readInt(u32));
 			if(conn.isServerSide()) {
 				return error.InvalidPacket;
-			} else {
-				renderer.mesh_storage.updateBlock(x, y, z, newBlock);
+			}
+			while(reader.remaining.len != 0) {
+				renderer.mesh_storage.updateBlock(.{
+					.x = try reader.readInt(i32),
+					.y = try reader.readInt(i32),
+					.z = try reader.readInt(i32),
+					.newBlock = Block.fromInt(try reader.readInt(u32)),
+				});
 			}
 		}
-		pub fn send(conn: *Connection, x: i32, y: i32, z: i32, newBlock: Block) void {
+		pub fn send(conn: *Connection, updates: []const BlockUpdate) void {
 			var writer = utils.BinaryWriter.initCapacity(main.stackAllocator, 16);
 			defer writer.deinit();
-			writer.writeInt(i32, x);
-			writer.writeInt(i32, y);
-			writer.writeInt(i32, z);
-			writer.writeInt(u32, newBlock.toInt());
+
+			for(updates) |update| {
+				writer.writeInt(i32, update.x);
+				writer.writeInt(i32, update.y);
+				writer.writeInt(i32, update.z);
+				writer.writeInt(u32, update.newBlock.toInt());
+			}
 			conn.send(.fast, id, writer.data.items);
 		}
 	};

src/renderer.zig

@@ -1111,7 +1111,7 @@ pub const MeshSelection = struct { // MARK: MeshSelection
 				.newBlock = newBlock,
 			},
 		});
-		mesh_storage.updateBlock(x, y, z, newBlock);
+		mesh_storage.updateBlock(.{.x = x, .y = y, .z = z, .newBlock = newBlock});
 	}
 
 	pub fn drawCube(projectionMatrix: Mat4f, viewMatrix: Mat4f, relativePositionToPlayer: Vec3d, min: Vec3f, max: Vec3f) void {

src/renderer/chunk_meshing.zig

@@ -1172,9 +1172,7 @@ pub const ChunkMesh = struct { // MARK: ChunkMesh
 		}
 	}
 
-	pub fn updateBlock(self: *ChunkMesh, _x: i32, _y: i32, _z: i32, _newBlock: Block) void {
-		var lightRefreshList = main.List(*ChunkMesh).init(main.stackAllocator);
-		defer lightRefreshList.deinit();
+	pub fn updateBlock(self: *ChunkMesh, _x: i32, _y: i32, _z: i32, _newBlock: Block, lightRefreshList: *main.List(*ChunkMesh), regenerateMeshList: *main.List(*ChunkMesh)) void {
 		const x: u5 = @intCast(_x & chunk.chunkMask);
 		const y: u5 = @intCast(_y & chunk.chunkMask);
 		const z: u5 = @intCast(_z & chunk.chunkMask);
@@ -1194,36 +1192,41 @@ pub const ChunkMesh = struct { // MARK: ChunkMesh
 
 		var neighborBlocks: [6]Block = undefined;
 		@memset(&neighborBlocks, .{.typ = 0, .data = 0});
+
 		for(chunk.Neighbor.iterable) |neighbor| {
 			const nx = x + neighbor.relX();
 			const ny = y + neighbor.relY();
 			const nz = z + neighbor.relZ();
+
 			if(nx & chunk.chunkMask != nx or ny & chunk.chunkMask != ny or nz & chunk.chunkMask != nz) {
+				const nnx: u5 = @intCast(nx & chunk.chunkMask);
+				const nny: u5 = @intCast(ny & chunk.chunkMask);
+				const nnz: u5 = @intCast(nz & chunk.chunkMask);
+
 				const neighborChunkMesh = mesh_storage.getNeighborAndIncreaseRefCount(self.pos, self.pos.voxelSize, neighbor) orelse continue;
 				defer neighborChunkMesh.decreaseRefCount();
-				const index = chunk.getIndex(nx & chunk.chunkMask, ny & chunk.chunkMask, nz & chunk.chunkMask);
+
+				const index = chunk.getIndex(nnx, nny, nnz);
+
 				neighborChunkMesh.mutex.lock();
 				var neighborBlock = neighborChunkMesh.chunk.data.getValue(index);
-				if(neighborBlock.mode().dependsOnNeighbors) {
-					if(neighborBlock.mode().updateData(&neighborBlock, neighbor.reverse(), newBlock)) {
+
+				if(neighborBlock.mode().dependsOnNeighbors and neighborBlock.mode().updateData(&neighborBlock, neighbor.reverse(), newBlock)) {
 					neighborChunkMesh.chunk.data.setValue(index, neighborBlock);
 					neighborChunkMesh.mutex.unlock();
-						neighborChunkMesh.updateBlockLight(@intCast(nx & chunk.chunkMask), @intCast(ny & chunk.chunkMask), @intCast(nz & chunk.chunkMask), neighborBlock, &lightRefreshList);
-						neighborChunkMesh.generateMesh(&lightRefreshList);
+					neighborChunkMesh.updateBlockLight(nnx, nny, nnz, neighborBlock, lightRefreshList);
+					appendIfNotContained(regenerateMeshList, neighborChunkMesh);
 					neighborChunkMesh.mutex.lock();
 				}
-				}
 				neighborChunkMesh.mutex.unlock();
 				neighborBlocks[neighbor.toInt()] = neighborBlock;
 			} else {
 				const index = chunk.getIndex(nx, ny, nz);
 				self.mutex.lock();
 				var neighborBlock = self.chunk.data.getValue(index);
-				if(neighborBlock.mode().dependsOnNeighbors) {
-					if(neighborBlock.mode().updateData(&neighborBlock, neighbor.reverse(), newBlock)) {
+				if(neighborBlock.mode().dependsOnNeighbors and neighborBlock.mode().updateData(&neighborBlock, neighbor.reverse(), newBlock)) {
 					self.chunk.data.setValue(index, neighborBlock);
-						self.updateBlockLight(@intCast(nx & chunk.chunkMask), @intCast(ny & chunk.chunkMask), @intCast(nz & chunk.chunkMask), neighborBlock, &lightRefreshList);
-					}
+					self.updateBlockLight(@intCast(nx), @intCast(ny), @intCast(nz), neighborBlock, lightRefreshList);
 				}
 				self.mutex.unlock();
 				neighborBlocks[neighbor.toInt()] = neighborBlock;
@@ -1242,9 +1245,9 @@ pub const ChunkMesh = struct { // MARK: ChunkMesh
 			class.onPlaceClient(.{_x, _y, _z}, self.chunk);
 		}
 
-		self.updateBlockLight(x, y, z, newBlock, &lightRefreshList);
+		self.updateBlockLight(x, y, z, newBlock, lightRefreshList);
+
 		self.mutex.lock();
-		defer self.mutex.unlock();
 		// Update neighbor chunks:
 		if(x == 0) {
 			self.lastNeighborsHigherLod[chunk.Neighbor.dirNegX.toInt()] = null;
@@ -1268,16 +1271,18 @@ pub const ChunkMesh = struct { // MARK: ChunkMesh
 			self.lastNeighborsSameLod[chunk.Neighbor.dirUp.toInt()] = null;
 		}
 		self.mutex.unlock();
-		self.generateMesh(&lightRefreshList); // TODO: Batch mesh updates instead of applying them for each block changes.
-		self.mutex.lock();
-		for(lightRefreshList.items) |other| {
-			if(other.needsLightRefresh.load(.unordered)) {
-				other.scheduleLightRefreshAndDecreaseRefCount1();
-			} else {
-				other.decreaseRefCount();
+
+		appendIfNotContained(regenerateMeshList, self);
+	}
+
+	fn appendIfNotContained(list: *main.List(*ChunkMesh), mesh: *ChunkMesh) void {
+		for(list.items) |other| {
+			if(other == mesh) {
+				return;
 			}
 		}
-		self.uploadData();
+		mesh.increaseRefCount();
+		list.append(mesh);
 	}
 
 	fn clearNeighborA(self: *ChunkMesh, neighbor: chunk.Neighbor, comptime isLod: bool) void {

src/renderer/lighting.zig

@@ -141,16 +141,7 @@ pub const ChannelChunk = struct {
 		}
 		self.data.optimizeLayout();
 		self.lock.unlockWrite();
-		if(mesh_storage.getMeshAndIncreaseRefCount(self.ch.pos)) |mesh| outer: {
-			for(lightRefreshList.items) |other| {
-				if(mesh == other) {
-					mesh.decreaseRefCount();
-					break :outer;
-				}
-			}
-			mesh.needsLightRefresh.store(true, .release);
-			lightRefreshList.append(mesh);
-		}
+		self.addSelfToLightRefreshList(lightRefreshList);
 
 		for(chunk.Neighbor.iterable) |neighbor| {
 			if(neighborLists[neighbor.toInt()].items.len == 0) continue;
@@ -160,6 +151,19 @@ pub const ChannelChunk = struct {
 		}
 	}
 
+	fn addSelfToLightRefreshList(self: *ChannelChunk, lightRefreshList: *main.List(*chunk_meshing.ChunkMesh)) void {
+		if(mesh_storage.getMeshAndIncreaseRefCount(self.ch.pos)) |mesh| {
+			for(lightRefreshList.items) |other| {
+				if(mesh == other) {
+					mesh.decreaseRefCount();
+					return;
+				}
+			}
+			mesh.needsLightRefresh.store(true, .release);
+			lightRefreshList.append(mesh);
+		}
+	}
+
 	fn propagateDestructive(self: *ChannelChunk, lightQueue: *main.utils.CircularBufferQueue(Entry), constructiveEntries: *main.ListUnmanaged(ChunkEntries), isFirstBlock: bool, lightRefreshList: *main.List(*chunk_meshing.ChunkMesh)) main.ListUnmanaged(PositionEntry) {
 		var neighborLists: [6]main.ListUnmanaged(Entry) = @splat(.{});
 		var constructiveList: main.ListUnmanaged(PositionEntry) = .{};
@@ -230,16 +234,7 @@ pub const ChannelChunk = struct {
 			}
 		}
 		self.lock.unlockWrite();
-		if(mesh_storage.getMeshAndIncreaseRefCount(self.ch.pos)) |mesh| outer: {
-			for(lightRefreshList.items) |other| {
-				if(mesh == other) {
-					mesh.decreaseRefCount();
-					break :outer;
-				}
-			}
-			mesh.needsLightRefresh.store(true, .release);
-			lightRefreshList.append(mesh);
-		}
+		self.addSelfToLightRefreshList(lightRefreshList);
 
 		for(chunk.Neighbor.iterable) |neighbor| {
 			if(neighborLists[neighbor.toInt()].items.len == 0) continue;

src/renderer/mesh_storage.zig

@@ -19,6 +19,7 @@ const Mat4f = vec.Mat4f;
 const EventStatus = main.entity_data.EventStatus;
 
 const chunk_meshing = @import("chunk_meshing.zig");
+const ChunkMesh = chunk_meshing.ChunkMesh;
 
 const ChunkMeshNode = struct {
 	mesh: ?*chunk_meshing.ChunkMesh = null,
@@ -44,12 +45,18 @@ var lastPy: i32 = 0;
 var lastPz: i32 = 0;
 var lastRD: u16 = 0;
 var mutex: std.Thread.Mutex = .{};
-const BlockUpdate = struct {
+
+pub const BlockUpdate = struct {
 	x: i32,
 	y: i32,
 	z: i32,
 	newBlock: blocks.Block,
+
+	pub fn init(pos: Vec3i, block: blocks.Block) BlockUpdate {
+		return .{.x = pos[0], .y = pos[1], .z = pos[2], .newBlock = block};
+	}
 };
+
 var blockUpdateList: main.utils.ConcurrentQueue(BlockUpdate) = undefined;
 
 var meshMemoryPool: main.heap.MemoryPool(chunk_meshing.ChunkMesh) = undefined;
@@ -758,15 +765,8 @@ pub noinline fn updateAndGetRenderChunks(conn: *network.Connection, frustum: *co
 	return meshList.items;
 }
 
-pub fn updateMeshes(targetTime: i64) void { // MARK: updateMeshes()
-	// First of all process all the block updates:
-	while(blockUpdateList.dequeue()) |blockUpdate| {
-		const pos = chunk.ChunkPosition{.wx = blockUpdate.x, .wy = blockUpdate.y, .wz = blockUpdate.z, .voxelSize = 1};
-		if(getMeshAndIncreaseRefCount(pos)) |mesh| {
-			defer mesh.decreaseRefCount();
-			mesh.updateBlock(blockUpdate.x, blockUpdate.y, blockUpdate.z, blockUpdate.newBlock);
-		} // TODO: It seems like we simply ignore the block update if we don't have the mesh yet.
-	}
+pub fn updateMeshes(targetTime: i64) void { // MARK: updateMeshes()=
+	if(!blockUpdateList.empty()) batchUpdateBlocks();
 
 	mutex.lock();
 	defer mutex.unlock();
@@ -859,6 +859,39 @@ pub fn updateMeshes(targetTime: i64) void { // MARK: updateMeshes()
 	}
 }
 
+fn batchUpdateBlocks() void {
+	var lightRefreshList = main.List(*ChunkMesh).init(main.stackAllocator);
+	defer lightRefreshList.deinit();
+
+	var regenerateMeshList = main.List(*ChunkMesh).init(main.stackAllocator);
+	defer regenerateMeshList.deinit();
+
+	// First of all process all the block updates:
+	while(blockUpdateList.dequeue()) |blockUpdate| {
+		const pos = chunk.ChunkPosition{.wx = blockUpdate.x, .wy = blockUpdate.y, .wz = blockUpdate.z, .voxelSize = 1};
+		if(getMeshAndIncreaseRefCount(pos)) |mesh| {
+			mesh.updateBlock(blockUpdate.x, blockUpdate.y, blockUpdate.z, blockUpdate.newBlock, &lightRefreshList, &regenerateMeshList);
+			mesh.decreaseRefCount();
+		} // TODO: It seems like we simply ignore the block update if we don't have the mesh yet.
+	}
+	for(regenerateMeshList.items) |mesh| {
+		mesh.generateMesh(&lightRefreshList);
+	}
+	{
+		for(lightRefreshList.items) |mesh| {
+			if(mesh.needsLightRefresh.load(.unordered)) {
+				mesh.scheduleLightRefreshAndDecreaseRefCount1();
+			} else {
+				mesh.decreaseRefCount();
+			}
+		}
+	}
+	for(regenerateMeshList.items) |mesh| {
+		mesh.uploadData();
+		mesh.decreaseRefCount();
+	}
+}
+
 // MARK: adders
 
 pub fn addMeshToClearListAndDecreaseRefCount(mesh: *chunk_meshing.ChunkMesh) void {
@@ -953,8 +986,8 @@ pub const MeshGenerationTask = struct { // MARK: MeshGenerationTask
 
 // MARK: updaters
 
-pub fn updateBlock(x: i32, y: i32, z: i32, newBlock: blocks.Block) void {
-	blockUpdateList.enqueue(.{.x = x, .y = y, .z = z, .newBlock = newBlock});
+pub fn updateBlock(update: BlockUpdate) void {
+	blockUpdateList.enqueue(update);
 }
 
 pub fn updateChunkMesh(mesh: *chunk.Chunk) void {

src/server/world.zig

@@ -1045,13 +1045,14 @@ pub const ServerWorld = struct { // MARK: ServerWorld
 			}
 		}
 		baseChunk.mutex.unlock();
+
 		var newBlock = _newBlock;
 		for(chunk.Neighbor.iterable) |neighbor| {
 			const nx = x + neighbor.relX();
 			const ny = y + neighbor.relY();
 			const nz = z + neighbor.relZ();
 			var ch = baseChunk;
-			if(nx & chunk.chunkMask != nx or ny & chunk.chunkMask != ny or nz & chunk.chunkMask != nz) {
+			if(!ch.liesInChunk(nx, ny, nz)) {
 				ch = ChunkManager.getOrGenerateChunkAndIncreaseRefCount(.{
 					.wx = baseChunk.super.pos.wx + nx & ~@as(i32, chunk.chunkMask),
 					.wy = baseChunk.super.pos.wy + ny & ~@as(i32, chunk.chunkMask),
@@ -1062,25 +1063,28 @@ pub const ServerWorld = struct { // MARK: ServerWorld
 			defer if(ch != baseChunk) {
 				ch.decreaseRefCount();
 			};
+
 			ch.mutex.lock();
 			defer ch.mutex.unlock();
+
 			var neighborBlock = ch.getBlock(nx & chunk.chunkMask, ny & chunk.chunkMask, nz & chunk.chunkMask);
-			if(neighborBlock.mode().dependsOnNeighbors) {
-				if(neighborBlock.mode().updateData(&neighborBlock, neighbor.reverse(), newBlock)) {
+			if(neighborBlock.mode().dependsOnNeighbors and neighborBlock.mode().updateData(&neighborBlock, neighbor.reverse(), newBlock)) {
 				ch.updateBlockAndSetChanged(nx & chunk.chunkMask, ny & chunk.chunkMask, nz & chunk.chunkMask, neighborBlock);
 			}
-			}
 			if(newBlock.mode().dependsOnNeighbors) {
 				_ = newBlock.mode().updateData(&newBlock, neighbor, neighborBlock);
 			}
 		}
 		baseChunk.mutex.lock();
 		defer baseChunk.mutex.unlock();
+
 		baseChunk.updateBlockAndSetChanged(x, y, z, newBlock);
+
 		const userList = server.getUserListAndIncreaseRefCount(main.stackAllocator);
 		defer server.freeUserListAndDecreaseRefCount(main.stackAllocator, userList);
+
 		for(userList) |user| {
-			main.network.Protocols.blockUpdate.send(user.conn, wx, wy, wz, _newBlock);
+			main.network.Protocols.blockUpdate.send(user.conn, &.{.{.x = wx, .y = wy, .z = wz, .newBlock = newBlock}});
 		}
 		return null;
 	}