func deserializeChunkData(raw []byte) (*mapgen.Chunk, error) {
offset := 0
version := raw[offset]
offset++
if version != 1 {
return nil, errors.New("Persist: Unrecognized chunk version.")
}
chunk := &mapgen.Chunk{}
for i := 0; i < coords.BlocksPerChunk; i++ {
chunk.SetBlock(coords.IndexOffset(i), mapgen.Block(raw[offset]))
offset++
}
return chunk, nil
}
func (fw *FlatWorld) Block(bc coords.Block) mapgen.Block {
blockSeed := int64(bc.X)
blockSeed += int64(bc.Y) << 32
blockSeed += int64(bc.Z) << 16
blockSeed += int64(fw.seed)
randGen := rand.New(rand.NewSource(blockSeed))
if bc.X == 0 && bc.Y == 16 && bc.Z == 0 {
return mapgen.BLOCK_SPAWN
}
if bc.Y < 15 {
return mapgen.BLOCK_DIRT
}
if bc.Y == 15 {
return mapgen.BLOCK_GRASS
}
if bc.X%4 == 0 && bc.Z%4 == 0 && bc.Y < 17 {
randBlock := 5 + randGen.Int()%9
return mapgen.Block(randBlock)
}
return mapgen.BLOCK_AIR
}