public static void Find()
{
var octree = new ChunkedOctree <bool>(3);
octree.Update(new(0, 0, 0), (int level, ReadOnlySpan <bool> children, ref bool parent) => parent = true);
octree.Update(new(-1, -1, -1), (int level, ReadOnlySpan <bool> children, ref bool parent) => parent = true);
octree.Update(new(2, 2, 2), (int level, ReadOnlySpan <bool> children, ref bool parent) => parent = true);
var searchFrom = new Vector3(8, 8, 8);
var(px, py, pz) = searchFrom;
var enumerator = octree.Find(
(level, pos, state) => {
if (!state)
{
return(null);
}
var(minX, minY, minZ) = pos << level << 4;
var maxX = minX + (1 << 4 << level);
var maxY = minY + (1 << 4 << level);
var maxZ = minZ + (1 << 4 << level);
var dx = (px < minX) ? minX - px : (px > maxX) ? maxX - px : 0.0F;
var dy = (py < minY) ? minY - py : (py > maxY) ? maxY - py : 0.0F;
var dz = (pz < minZ) ? minZ - pz : (pz > maxZ) ? maxZ - pz : 0.0F;
return(dx * dx + dy * dy + dz * dz);
}, searchFrom.ToChunkPos())
.GetEnumerator();
Assert.True(enumerator.MoveNext()); var first = enumerator.Current;
Assert.True(enumerator.MoveNext()); var second = enumerator.Current;
Assert.True(enumerator.MoveNext()); var third = enumerator.Current;
Assert.False(enumerator.MoveNext());
Assert.Equal(new(0, 0, 0), first.ChunkPos);
Assert.Equal(0, first.Weight);
Assert.True(first.Value);
Assert.Equal(new(-1, -1, -1), second.ChunkPos);
Assert.Equal(8 * 8 + 8 * 8 + 8 * 8, second.Weight);
Assert.True(second.Value);
Assert.Equal(new(2, 2, 2), third.ChunkPos);
Assert.Equal(24 * 24 + 24 * 24 + 24 * 24, third.Weight);
Assert.True(third.Value);
}
public void Work()
{
var octree = new ChunkedOctree<State>(5);
while (true) {
var (px, py, pz) = _playerPosition;
// TODO: Re-use the enumerator if position is still (roughly) the same octree wasn't modified.
var enumerator = octree.Find(
(level, pos, state) => {
if ((state & State.GeneratedAll) == State.GeneratedAll) return null;
var (minX, minY, minZ) = pos << Chunk.BIT_SHIFT << level;
var maxX = minX + (1 << Chunk.BIT_SHIFT << level);
var maxY = minY + (1 << Chunk.BIT_SHIFT << level);
var maxZ = minZ + (1 << Chunk.BIT_SHIFT << level);
var dx = (px < minX) ? minX - px : (px > maxX) ? maxX - px : 0.0F;
var dy = (py < minY) ? minY - py : (py > maxY) ? maxY - py : 0.0F;
var dz = (pz < minZ) ? minZ - pz : (pz > maxZ) ? maxZ - pz : 0.0F;
return dx * dx + dy * dy + dz * dz;
},
_playerPosition.ToChunkPos())
.Where(x => x.Weight <= DISTANCE_SQUARED)
.GetEnumerator();
while (enumerator.MoveNext()) {
var (chunkPos, _, _) = enumerator.Current;
var chunk = (Chunk)_chunks.GetChunkOrCreate(chunkPos);
// TODO: This is cobbled together. Would not work if chunks are created outside of this class.
if (chunk.NumGeneratedNeighbors < 0)
chunk.NumGeneratedNeighbors = Neighbors.ALL.Select(n => chunkPos + n)
.Count(pos => (octree.Get(pos) & State.GeneratedAll) == State.GeneratedAll);
// Find the generator that needs to be applied next.
var generator = Generators
.Where(g => !chunk.AppliedGenerators.Contains(g.Identifier))
.FirstOrNull();
if (generator != null) {
// TODO: Instead of skipping this chunk if dependent neighboring chunks
// haven't been generated, immediately start to generate that chunk.
// In the same line, generate as much of the chunk as possible?
if (!generator.NeighborDependencies.All(
dep => _chunks.GetChunkOrNull(chunkPos + dep.Neighbor)
?.AppliedGenerators.Contains(dep.Generator) == true))
continue;
// TODO: This doesn't seem safe to run in a thread?
generator.Populate(chunk);
chunk.AppliedGenerators.Add(generator.Identifier);
break;
} else {
// If no generator was found, the chunk has completed generating.
octree.Update(chunkPos,
(int level, ReadOnlySpan<State> children, ref State parent) => {
var mask = State.GeneratedAll;
foreach (var childState in children)
if ((childState & State.GeneratedAll) != State.GeneratedAll)
{ mask = State.GeneratedSome; break; }
parent |= mask;
});
foreach (var neighbor in chunk.Neighbors)
if (++neighbor.NumGeneratedNeighbors == Neighbors.ALL.Count)
_world.Schedule(() => ((ChunkManager)_chunks).InvokeChunkReady(neighbor));
break;
}
}
Thread.Sleep(0);
}
}