128 lines
2.5 KiB
Go
128 lines
2.5 KiB
Go
package world
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import (
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"fmt"
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"math/rand"
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)
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const (
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// Slice size is the total number of blocks in a horizontal slice of a chunk
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sliceSize = 16 * 16
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)
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type BlockPos struct {
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X int `json:"x"`
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Y uint `json:"y"`
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Z int `json:"z"`
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}
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func RandomBlockPosWithRange(maxRange float64) BlockPos {
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return BlockPos{
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X: int(rand.NormFloat64() * maxRange),
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Y: uint(rand.NormFloat64() * maxRange),
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Z: int(rand.NormFloat64() * maxRange),
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}
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}
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func (b BlockPos) ToChunkPos() ChunkPos {
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return ChunkPos{
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X: b.X / 16,
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Z: b.Z / 16,
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}
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}
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type ChunkData struct {
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Pos ChunkPos `json:"pos"`
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Sections [16]ChunkSection `json:"sections"`
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}
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func (cd *ChunkData) SectionFor(pos BlockPos) *ChunkSection {
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return &cd.Sections[pos.Y%16]
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}
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type ChunkPos struct {
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X int `json:"x"`
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Z int `json:"z"`
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}
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func (cp ChunkPos) ToFileName() string {
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return fmt.Sprintf("p.%d.%d.chunk", cp.X, cp.Z)
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}
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func (cp ChunkPos) StringCoords() string {
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return fmt.Sprintf("%d, %d", cp.X, cp.Z)
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}
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type ChunkSection struct {
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// The count of full blocks in the chunk
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BlockCount uint `json:"block_count"`
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BlockStates [16 * 16 * 16]BlockID `json:"block_states"`
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}
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func rem_euclid(a, b int) int {
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return (a%b + b) % b
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}
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func (cs *ChunkSection) IndexOfBlock(pos BlockPos) int {
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baseX := rem_euclid(pos.X, 16)
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baseY := rem_euclid(int(pos.Y), 16)
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baseZ := rem_euclid(pos.Z, 16)
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return (baseY * sliceSize) + (baseZ * 16) + baseX
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}
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func (cs *ChunkSection) UpdateBlockAtIndex(index int, targetState BlockID) {
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// TODO: Keep track of the block count
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cs.BlockStates[index] = targetState
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}
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func (cs *ChunkSection) UpdateBlock(pos BlockPos, targetState BlockID) {
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cs.BlockStates[cs.IndexOfBlock(pos)] = targetState
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}
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func (cs *ChunkSection) FetchBlock(pos BlockPos) BlockID {
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return cs.BlockStates[cs.IndexOfBlock(pos)]
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}
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type BlockID uint8
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const (
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Empty BlockID = iota
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Generic
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)
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func (b *BlockID) UnmarshalJSON(data []byte) error {
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idName := string(data)
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if len(idName) < 2 {
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return fmt.Errorf("error decoding blockid, input was too short")
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}
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switch idName[1 : len(idName)-1] {
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case "Empty":
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*b = Empty
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case "Generic":
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*b = Generic
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default:
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return fmt.Errorf("unknown block id: %s", string(data))
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}
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return nil
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}
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func (b BlockID) MarshalJSON() ([]byte, error) {
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var encoded []byte
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switch b {
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case Empty:
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encoded = []byte("\"Empty\"")
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case Generic:
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encoded = []byte("\"Generic\"")
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default:
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return []byte{}, fmt.Errorf("could not turn block id %d into data", b)
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}
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return encoded, nil
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}
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