public bool TryGetLocalWithNeighborChunk(int i, int j, int k, out VoxelChunkAddress address, out Voxel voxel)
{
if (j < 0)
{
address = VoxelChunkAddress.Zero;
voxel = Voxel.Bedrock;
return(false);
}
var cx = (int)(-((i & 0b10000000_00000000_00000000_00000000) >> 31) + ((i / SizeXy)));
var cy = (int)(-((k & 0b10000000_00000000_00000000_00000000) >> 31) + ((k / SizeXy)));
var chunk = GetNeighbor(cx, cy);
if (chunk.CurrentHeight <= j)
{
address = VoxelChunkAddress.Zero;
voxel = Voxel.SunBlock;
return(false);
}
else
{
address = new VoxelChunkAddress(chunk, new Int3(i & (SizeXy - 1), j, k & (SizeXy - 1)));
voxel = chunk.GetVoxel(address.RelativeVoxelIndex.X, j, address.RelativeVoxelIndex.Z);
return(true);
}
}
public static IEnumerable<VoxelChunkAddress> GetAllLightSourceNeighbor(VoxelChunkAddress targetAddress, Voxel targetVoxel)
{
foreach (var direction in LightDirections.All)
{
var sourceIndex = targetAddress.RelativeVoxelIndex + direction.Step;
if (targetAddress.Chunk.TryGetLocalWithNeighborChunk(sourceIndex, out var sourceAddress, out var sourceVoxel) && sourceVoxel.CompositeLight > 0)
{
var sourceDefinition = sourceVoxel.GetDefinition();
var targetDefinition = targetVoxel.GetDefinition();
var brightnessLoss = VoxelDefinition.GetBrightnessLoss(sourceDefinition, targetDefinition, direction.Direction);
if (brightnessLoss > 0)
{
yield return sourceAddress;
}
}
}
}
private void UpdateLighting(VoxelChunkAddress address, Voxel oldVoxel, Voxel newVoxel)
{
// there are multiple steps which are generating dark spots
var darknessSources = new Queue <DarknessSource>();
// SUNLIGHT DARKENING: in case the lower voxel is/was under the sky, the sunlight must be deleted downward
if (address.RelativeVoxelIndex.Y > 1 && address.Chunk.GetVoxel(address.RelativeVoxelIndex - Int3.UnitY).Sunlight == 15)
{
foreach (var sunlightRelativeIndex in LightingService.Sunlight(address, 0, true))
{
darknessSources.Enqueue(new DarknessSource(new VoxelChunkAddress(address.Chunk, sunlightRelativeIndex), oldVoxel.SetSunlight(15)));
}
}
// ROOT DARKENING: the root cause voxel always suspect of darkening
darknessSources.Enqueue(new DarknessSource(address, oldVoxel));
// PROPAGATE DARKNESS
var lightSources = LightingService.GlobalPropagateDarkness(darknessSources);
// SUNLIGHT PROPAGATION: in case the upper voxel is/was under the sky, the sunlight must be propagated
var upperVoxelIndex = address.RelativeVoxelIndex + Int3.UnitY;
if (upperVoxelIndex.Y < address.Chunk.CurrentHeight - 1 && address.Chunk.GetVoxel(upperVoxelIndex).Sunlight == 15)
{
foreach (var sunlightSources in LightingService.Sunlight(address.Chunk, upperVoxelIndex, 15, true))
{
lightSources.Add(new VoxelChunkAddress(address.Chunk, sunlightSources));
}
}
// NEIGHBOR SOURCES: in case a block was removed and was not under the sky, all the neighbors are potential light sources
foreach (var neighborLightSourceAddress in LightingService.GetAllLightSourceNeighbor(address, newVoxel))
{
lightSources.Add(neighborLightSourceAddress);
}
// ROOT PROPAGATE: the root case voxel always suspect of propagation
lightSources.Add(address);
foreach (var lightSource in lightSources)
{
LightingService.GlobalPropagate(lightSource);
}
}
public bool TryGetVoxelAddress(Int3 absoluteVoxelIndex, out VoxelChunkAddress address)
{
if (!TryGetChunkIndexByAbsoluteVoxelIndex(absoluteVoxelIndex, out var chunkIndex))
{
address = VoxelChunkAddress.Zero;
return(false);
}
if (!TryGetChunk(chunkIndex, out var chunk))
{
address = VoxelChunkAddress.Zero;
return(false);
}
var voxelIndex = new Int3(absoluteVoxelIndex.X & Chunk.SizeXy - 1, absoluteVoxelIndex.Y, absoluteVoxelIndex.Z & Chunk.SizeXy - 1);
address = new VoxelChunkAddress(chunk, voxelIndex);
return(true);
}
public static void GlobalPropagate(VoxelChunkAddress address) => GlobalPropagate(new Queue<VoxelChunkAddress>(new[] {address}));
public static IEnumerable<Int3> Sunlight(VoxelChunkAddress address, byte toLightness, bool isChangeTracking = false) => Sunlight(address.Chunk, address.RelativeVoxelIndex, toLightness, isChangeTracking);
public bool TryGetLocalWithNeighborChunk(Int3 ijk, out VoxelChunkAddress address, out Voxel voxel) => TryGetLocalWithNeighborChunk(ijk.X, ijk.Y, ijk.Z, out address, out voxel);