private void ProcessNode(IBlockAccess level, ChunkColumn chunk, BlockCoordinates coordinates, Queue <BlockCoordinates> lightBfsQueue, HashSet <BlockCoordinates> lightBfSet)
{
//if (section.IsAllAir())
byte currentSkyLight = GetSkyLight(coordinates, chunk);
int sectionIdx = coordinates.Y >> 4;
ChunkBase section = chunk.GetChunk(coordinates.Y);
byte maxSkyLight = currentSkyLight;
if (coordinates.Y < 255)
{
var up = coordinates.BlockUp();
maxSkyLight = Math.Max(maxSkyLight, SetLightLevel(level, chunk, section, sectionIdx, lightBfsQueue, lightBfSet, up, currentSkyLight, up: true));
}
if (coordinates.Y > 0)
{
var down = coordinates.BlockDown();
maxSkyLight = Math.Max(maxSkyLight, SetLightLevel(level, chunk, section, sectionIdx, lightBfsQueue, lightBfSet, down, currentSkyLight, down: true));
}
var west = coordinates.BlockWest();
maxSkyLight = Math.Max(maxSkyLight, SetLightLevel(level, chunk, section, sectionIdx, lightBfsQueue, lightBfSet, west, currentSkyLight));
var east = coordinates.BlockEast();
maxSkyLight = Math.Max(maxSkyLight, SetLightLevel(level, chunk, section, sectionIdx, lightBfsQueue, lightBfSet, east, currentSkyLight));
var south = coordinates.BlockSouth();
maxSkyLight = Math.Max(maxSkyLight, SetLightLevel(level, chunk, section, sectionIdx, lightBfsQueue, lightBfSet, south, currentSkyLight));
var north = coordinates.BlockNorth();
maxSkyLight = Math.Max(maxSkyLight, SetLightLevel(level, chunk, section, sectionIdx, lightBfsQueue, lightBfSet, north, currentSkyLight));
if (IsTransparent(coordinates, section) && currentSkyLight != 15)
{
int diffuseLevel = GetDiffuseLevel(coordinates, section);
maxSkyLight = (byte)Math.Max(currentSkyLight, maxSkyLight - diffuseLevel);
if (maxSkyLight > currentSkyLight)
{
level.SetSkyLight(coordinates, maxSkyLight);
if (!lightBfSet.Contains(coordinates))
{
lightBfsQueue.Enqueue(coordinates);
lightBfSet.Add(coordinates);
}
}
}
}
public static byte GetSkyLight(BlockCoordinates blockCoordinates, ChunkBase chunk)
{
if (chunk == null)
{
return(15);
}
int bx = blockCoordinates.X & 0x0f;
int by = blockCoordinates.Y & 0xff;
int bz = blockCoordinates.Z & 0x0f;
return(chunk.GetSkylight(bx, by - 16 * (by >> 4), bz));
}
public static bool IsTransparent(BlockCoordinates blockCoordinates, ChunkBase section)
{
if (section == null)
{
return(true);
}
int bx = blockCoordinates.X & 0x0f;
int by = blockCoordinates.Y & 0xff;
int bz = blockCoordinates.Z & 0x0f;
int bid = section.GetBlock(bx, by - 16 * (by >> 4), bz);
return(bid == 0 || BlockFactory.TransparentBlocks[bid] == 1);
}
public static int GetDiffuseLevel(BlockCoordinates blockCoordinates, ChunkBase chunk)
{
if (chunk == null)
{
return(15);
}
int bx = blockCoordinates.X & 0x0f;
int by = blockCoordinates.Y & 0xff;
int bz = blockCoordinates.Z & 0x0f;
int bid = chunk.GetBlock(bx, by - 16 * (by >> 4), bz);
return(bid == 8 || bid == 9 ? 3 : bid == 18 && bid == 30 ? 2 : 1);
}
public static int GetDiffuseLevel(BlockCoordinates blockCoordinates, ChunkBase section)
{
//TODO: Figure out if this is really correct. Perhaps should be zero.
if (section == null)
{
return(15);
}
int bx = blockCoordinates.X & 0x0f;
int by = blockCoordinates.Y & 0xff;
int bz = blockCoordinates.Z & 0x0f;
int bid = section.GetBlock(bx, by - 16 * (by >> 4), bz);
return(bid == 8 || bid == 9 ? 3 : bid == 18 || bid == 161 || bid == 30 ? 2 : 1);
}
private byte SetLightLevel(IBlockAccess level, ChunkColumn chunk, ChunkBase section, int sectionIdx, Queue <BlockCoordinates> lightBfsQueue, HashSet <BlockCoordinates> lightBfSet, BlockCoordinates coordinates, byte lightLevel, bool down = false, bool up = false)
{
//Interlocked.Add(ref visits, 1);
if (TrackResults)
{
MakeVisit(coordinates);
}
if (!(up || down) && (chunk.x != coordinates.X >> 4 || chunk.z != coordinates.Z >> 4))
{
chunk = level.GetChunk((ChunkCoordinates)coordinates);
section = null;
}
else
{
if ((up || down) && coordinates.Y >> 4 != sectionIdx)
{
section = null;
}
}
if (chunk == null /* || chunk.chunks == null*/)
{
return(lightLevel);
}
if (!down && !up && coordinates.Y >= GetHeight(coordinates, chunk))
{
if (GetSkyLight(coordinates, section) != 15)
{
SetSkyLight(coordinates, 15, chunk);
if (!lightBfSet.Contains(coordinates))
{
lightBfsQueue.Enqueue(coordinates);
lightBfSet.Add(coordinates);
}
}
return(15);
}
if (section == null)
{
section = chunk.GetChunk(coordinates.Y);
}
bool isTransparent = IsTransparent(coordinates, section);
byte skyLight = GetSkyLight(coordinates, section);
if (down && isTransparent && lightLevel == 15)
{
if (IsNotBlockingSkylight(coordinates, chunk))
{
if (skyLight != 15)
{
SetSkyLight(coordinates, 15, chunk);
}
if (!lightBfSet.Contains(coordinates))
{
lightBfsQueue.Enqueue(coordinates);
lightBfSet.Add(coordinates);
}
return(15);
}
}
if (isTransparent)
{
int diffuseLevel = GetDiffuseLevel(coordinates, section);
if (skyLight + 1 + diffuseLevel <= lightLevel)
{
byte newLevel = (byte)(lightLevel - diffuseLevel);
SetSkyLight(coordinates, newLevel, chunk);
if (!lightBfSet.Contains(coordinates))
{
lightBfsQueue.Enqueue(coordinates);
lightBfSet.Add(coordinates);
}
return(newLevel);
}
}
return(skyLight);
}
