private BlockDistribution GenerateBlockDistribution(ChunkPos pos)
{
var rnd = new System.Random(persistor.GetSeed() - pos.x * 31 - pos.z * 23);
double height;
BlockDistribution blocks = new BlockDistribution();
bool hasTree = false;
for (int x = 0; x < TerrainChunk.CHUNK_SIZE + 2; x++)
{
for (int z = 0; z < TerrainChunk.CHUNK_SIZE + 2; z++)
{
height = Math.Floor(ComputeHeightAt(pos.x + x - 1, pos.z + z - 1));
for (int y = 0; y < TerrainChunk.CHUNK_HEIGHT; y++)
{
blocks[x, y, z] = GetForHeight(y, height);
}
if (!hasTree && x > 4 && x < 12 && z > 4 && z < 12)
{
int r = rnd.Next(1, 115 + (int)Math.Pow(height, height / 65.0));
if (r == 2)
{
hasTree = true;
GenerateTree(rnd, blocks, x, (int)height + 1, z);
}
}
}
}
return(blocks);
}
private Action <Stream> BlocksToBytes(BlockDistribution blocks) => str =>
{
foreach (BlockType b in blocks)
{
str.WriteByte((byte)b);
}
str.Flush();
};
private void CacheChunk(ChunkPos pos, BlockDistribution blocks)
{
cache.AddFirst(pos);
chunkBlocks.Add(pos, blocks);
if (cache.Count > CACHE_SIZE)
{
SaveChunk(pos, chunkBlocks[pos]);
var toRemove = cache.Last.Value;
chunkBlocks.Remove(toRemove);
cache.RemoveLast();
}
}
private void SaveChunk(ChunkPos pos, BlockDistribution blocks)
{
if (blocks == null)
{
throw new ApplicationException("Chunk not loaded");
}
if (!blocks.Dirty)
{
return;
}
blocks.Dirty = false;
Save(GetChunkFile(pos), BlocksToBytes(blocks));
}
private BlockDistribution BytesToBlocks(byte[] bytes)
{
BlockDistribution blocks = new BlockDistribution();
long i = 0;
for (int x = 1; x < BlockDistribution.SIDE - 1; x++)
{
for (int z = 1; z < BlockDistribution.SIDE - 1; z++)
{
for (int y = 0; y < BlockDistribution.HEIGHT; y++)
{
blocks[x, y, z] = (BlockType)bytes[i++];
}
}
}
return(blocks);
}
private void GenerateTree(System.Random r, BlockDistribution blocks, int x, int y, int z)
{
int t = r.Next(2, 5);
int h = r.Next(4, 6);
int w = r.Next(1, 4);
int w2 = r.Next(1, 4);
int hh = w + w2 >= 4 ? 1 : 0;
for (int k = y + 2 + hh; k <= y + h + hh; k++)
{
if (k == y + h)
{
w2 -= Math.Min(1, r.Next(3));
w -= r.Next(2);
}
else if (k == y + h - 1 && r.Next(3) < 2)
{
w2 -= Math.Max(0, r.Next(-1, 2));
w -= Math.Max(0, r.Next(-1, 2));
}
for (int i = x - w2; i <= x + w; i++)
{
for (int j = z - w; j <= z + w2; j++)
{
blocks[i, k, j] = BlockType.Leaves;
}
}
}
for (int i = 0; i < t + hh; i++)
{
blocks[x - 1, y + i, z] = BlockType.Log;
}
}