public void RebuildBlockSkyLight()
{
IBoundedLitBlockCollection[,] chunkMap = LocalBlockLightMap();
int[,] heightMap = LocalHeightMap(chunkMap);
int xdim = _xdim;
int ydim = _ydim;
int zdim = _zdim;
// Optimization - only need to queue at level of highest neighbor's height
for (int x = 0; x < xdim; x++)
{
for (int z = 0; z < zdim; z++)
{
int xi = x + xdim;
int zi = z + zdim;
int h = heightMap[xi, zi];
h = Math.Max(h, heightMap[xi, zi - 1]);
h = Math.Max(h, heightMap[xi - 1, zi]);
h = Math.Max(h, heightMap[xi + 1, zi]);
h = Math.Max(h, heightMap[xi, zi + 1]);
for (int y = h + 1; y < ydim; y++)
{
_blockset.SetSkyLight(x, y, z, BlockInfo.MAX_LUMINANCE);
}
//QueueRelight(new BlockKey(x, h, z));
SpreadSkyLight(chunkMap, heightMap, x, h, z);
}
}
}
private void SpreadSkyLight(IBoundedLitBlockCollection[,] chunkMap, int[,] heightMap, int lx, int ly, int lz)
{
BlockInfo primary = _blockset.GetInfo(lx, ly, lz);
int primaryLight = _blockset.GetSkyLight(lx, ly, lz);
int priLum = Math.Max(BlockInfo.MAX_LUMINANCE - primary.Opacity, 0);
if (primaryLight < priLum)
{
_blockset.SetSkyLight(lx, ly, lz, priLum);
}
if (primaryLight > BlockInfo.MAX_LUMINANCE - 1 || !primary.TransmitsLight)
{
return;
}
Queue <LightRecord> spread = new Queue <LightRecord>();
int xdim = _xdim;
int ydim = _ydim;
int zdim = _zdim;
int lxi = lx + xdim;
int lzi = lz + zdim;
int strength = (primary.Opacity > 0) ? priLum : priLum - 1;
if (ly > 0)
{
if (heightMap[lxi, lzi] > ly - 1)
{
spread.Enqueue(new LightRecord(lx, ly - 1, lz, strength));
}
else
{
spread.Enqueue(new LightRecord(lx, ly - 1, lz, priLum));
}
}
if (ly < ydim - 1)
{
if (heightMap[lxi, lzi] > ly + 1)
{
spread.Enqueue(new LightRecord(lx, ly + 1, lz, strength));
}
}
if (heightMap[lxi - 1, lzi] > ly)
{
spread.Enqueue(new LightRecord(lx - 1, ly, lz, strength));
}
if (heightMap[lxi + 1, lzi] > ly)
{
spread.Enqueue(new LightRecord(lx + 1, ly, lz, strength));
}
if (heightMap[lxi, lzi - 1] > ly)
{
spread.Enqueue(new LightRecord(lx, ly, lz - 1, strength));
}
if (heightMap[lxi, lzi + 1] > ly)
{
spread.Enqueue(new LightRecord(lx, ly, lz + 1, strength));
}
while (spread.Count > 0)
{
LightRecord rec = spread.Dequeue();
int xi = rec.x + xdim;
int zi = rec.z + zdim;
IBoundedLitBlockCollection cc = chunkMap[xi / xdim, zi / zdim];
if (cc == null)
{
continue;
}
int x = xi % xdim;
int y = rec.y;
int z = zi % zdim;
BlockInfo info = cc.GetInfo(x, y, z);
int light = cc.GetSkyLight(x, y, z);
int dimStr = Math.Max(rec.str - info.Opacity, 0);
if (dimStr > light)
{
cc.SetSkyLight(x, y, z, dimStr);
if (info.TransmitsLight)
{
strength = (info.Opacity > 0) ? dimStr : dimStr - 1;
if (rec.y > 0)
{
if (heightMap[xi, zi] > rec.y - 1)
{
spread.Enqueue(new LightRecord(rec.x, rec.y - 1, rec.z, strength));
}
else
{
spread.Enqueue(new LightRecord(rec.x, rec.y - 1, rec.z, dimStr));
}
}
if (rec.y < ydim - 1)
{
if (heightMap[xi, zi] > rec.y + 1)
{
spread.Enqueue(new LightRecord(rec.x, rec.y + 1, rec.z, strength));
}
}
if (heightMap[xi - 1, zi] > rec.y)
{
spread.Enqueue(new LightRecord(rec.x - 1, rec.y, rec.z, strength));
}
if (heightMap[xi + 1, zi] > rec.y)
{
spread.Enqueue(new LightRecord(rec.x + 1, rec.y, rec.z, strength));
}
if (heightMap[xi, zi - 1] > rec.y)
{
spread.Enqueue(new LightRecord(rec.x, rec.y, rec.z - 1, strength));
}
if (heightMap[xi, zi + 1] > rec.y)
{
spread.Enqueue(new LightRecord(rec.x, rec.y, rec.z + 1, strength));
}
}
}
}
}
private void UpdateBlockSkyLight()
{
IBoundedLitBlockCollection[,] chunkMap = LocalBlockLightMap();
int xdim = _xdim;
int ydim = _ydim;
int zdim = _zdim;
while (_update.Count > 0)
{
BlockKey k = _update.Dequeue();
int index = LightBitmapIndex(k);
_lightbit[index] = false;
int xi = k.x + xdim;
int zi = k.z + zdim;
IBoundedLitBlockCollection cc = chunkMap[xi / xdim, zi / zdim];
if (cc == null)
{
continue;
}
int x = xi % xdim;
int y = k.y;
int z = zi % zdim;
int lightval = cc.GetSkyLight(x, y, z);
BlockInfo info = cc.GetInfo(x, y, z);
int light = BlockInfo.MIN_LUMINANCE;
if (cc.GetHeight(x, z) <= y)
{
light = BlockInfo.MAX_LUMINANCE;
}
else
{
int lle = NeighborSkyLight(chunkMap, k.x, k.y, k.z - 1);
int lln = NeighborSkyLight(chunkMap, k.x - 1, k.y, k.z);
int lls = NeighborSkyLight(chunkMap, k.x, k.y, k.z + 1);
int llw = NeighborSkyLight(chunkMap, k.x + 1, k.y, k.z);
int lld = NeighborSkyLight(chunkMap, k.x, k.y - 1, k.z);
int llu = NeighborSkyLight(chunkMap, k.x, k.y + 1, k.z);
light = Math.Max(light, lle);
light = Math.Max(light, lln);
light = Math.Max(light, lls);
light = Math.Max(light, llw);
light = Math.Max(light, lld);
light = Math.Max(light, llu);
}
light = Math.Max(light - info.Opacity, 0);
if (light != lightval)
{
//Console.WriteLine("Block SkyLight: ({0},{1},{2}) " + lightval + " -> " + light, k.x, k.y, k.z);
cc.SetSkyLight(x, y, z, light);
if (info.TransmitsLight)
{
if (k.y > 0)
{
QueueRelight(new BlockKey(k.x, k.y - 1, k.z));
}
if (k.y < ydim - 1)
{
QueueRelight(new BlockKey(k.x, k.y + 1, k.z));
}
QueueRelight(new BlockKey(k.x - 1, k.y, k.z));
QueueRelight(new BlockKey(k.x + 1, k.y, k.z));
QueueRelight(new BlockKey(k.x, k.y, k.z - 1));
QueueRelight(new BlockKey(k.x, k.y, k.z + 1));
}
}
}
}