Files
go-mc/level/chunk.go
2021-12-27 20:48:30 +08:00

266 lines
6.7 KiB
Go

package level
import (
"bytes"
"io"
"math/bits"
"strings"
"sync"
"unsafe"
"github.com/Tnze/go-mc/data/block"
pk "github.com/Tnze/go-mc/net/packet"
"github.com/Tnze/go-mc/save"
)
type ChunkPos struct{ X, Z int }
type Chunk struct {
sync.Mutex
Sections []Section
HeightMaps HeightMaps
}
type HeightMaps struct {
MotionBlocking *BitStorage
WorldSurface *BitStorage
}
func EmptyChunk(secs int) *Chunk {
sections := make([]Section, secs)
for i := range sections {
sections[i] = Section{
blockCount: 0,
States: NewStatesPaletteContainer(16*16*16, 0),
Biomes: NewBiomesPaletteContainer(4*4*4, 0),
}
}
return &Chunk{
Sections: sections,
HeightMaps: HeightMaps{
MotionBlocking: NewBitStorage(bits.Len(uint(secs)*16), 16*16, nil),
},
}
}
var biomesIDs = map[string]int{
"the_void": 0,
"plains": 1,
"sunflower_plains": 2,
"snowy_plains": 3,
"ice_spikes": 4,
"desert": 5,
"swamp": 6,
"forest": 7,
"flower_forest": 8,
"birch_forest": 9,
"dark_forest": 10,
"old_growth_birch_forest": 11,
"old_growth_pine_taiga": 12,
"old_growth_spruce_taiga": 13,
"taiga": 14,
"snowy_taiga": 15,
"savanna": 16,
"savanna_plateau": 17,
"windswept_hills": 18,
"windswept_gravelly_hills": 19,
"windswept_forest": 20,
"windswept_savanna": 21,
"jungle": 22,
"sparse_jungle": 23,
"bamboo_jungle": 24,
"badlands": 25,
"eroded_badlands": 26,
"wooded_badlands": 27,
"meadow": 28,
"grove": 29,
"snowy_slopes": 30,
"frozen_peaks": 31,
"jagged_peaks": 32,
"stony_peaks": 33,
"river": 34,
"frozen_river": 35,
"beach": 36,
"snowy_beach": 37,
"stony_shore": 38,
"warm_ocean": 39,
"lukewarm_ocean": 40,
"deep_lukewarm_ocean": 41,
"ocean": 42,
"deep_ocean": 43,
"cold_ocean": 44,
"deep_cold_ocean": 45,
"frozen_ocean": 46,
"deep_frozen_ocean": 47,
"mushroom_fields": 48,
"dripstone_caves": 49,
"lush_caves": 50,
"nether_wastes": 51,
"warped_forest": 52,
"crimson_forest": 53,
"soul_sand_valley": 54,
"basalt_deltas": 55,
"the_end": 56,
"end_highlands": 57,
"end_midlands": 58,
"small_end_islands": 59,
"end_barrens": 60,
}
func ChunkFromSave(c *save.Chunk, secs int) *Chunk {
sections := make([]Section, secs)
for _, v := range c.Sections {
var blockCount int16
stateData := *(*[]uint64)((unsafe.Pointer)(&v.BlockStates.Data))
statePalette := v.BlockStates.Palette
stateRawPalette := make([]int, len(statePalette))
for i, v := range statePalette {
// TODO: Consider the properties of block, not only index the block name
stateRawPalette[i] = int(stateIDs[strings.TrimPrefix(v.Name, "minecraft:")])
if v.Name != "minecraft:air" {
blockCount++
}
}
biomesData := *(*[]uint64)((unsafe.Pointer)(&v.Biomes.Data))
biomesPalette := v.Biomes.Palette
biomesRawPalette := make([]int, len(biomesPalette))
for i, v := range biomesPalette {
biomesRawPalette[i] = biomesIDs[strings.TrimPrefix(v, "minecraft:")]
}
i := int32(int8(v.Y)) - c.YPos
sections[i].blockCount = blockCount
sections[i].States = NewStatesPaletteContainerWithData(16*16*16, stateData, stateRawPalette)
sections[i].Biomes = NewBiomesPaletteContainerWithData(4*4*4, biomesData, biomesRawPalette)
}
for i := range sections {
if sections[i].States == nil {
sections[i] = Section{
blockCount: 0,
States: NewStatesPaletteContainer(16*16*16, 0),
Biomes: NewBiomesPaletteContainer(4*4*4, 0),
}
}
}
motionBlocking := *(*[]uint64)(unsafe.Pointer(&c.Heightmaps.MotionBlocking))
worldSurface := *(*[]uint64)(unsafe.Pointer(&c.Heightmaps.WorldSurface))
return &Chunk{
Sections: sections,
HeightMaps: HeightMaps{
MotionBlocking: NewBitStorage(bits.Len(uint(secs)), 16*16, motionBlocking),
WorldSurface: NewBitStorage(bits.Len(uint(secs)), 16*16, worldSurface),
},
}
}
// TODO: This map should be moved to data/block.
var stateIDs = make(map[string]uint32)
func init() {
for i, v := range block.StateID {
name := block.ByID[v].Name
if _, ok := stateIDs[name]; !ok {
stateIDs[name] = i
}
}
}
func (c *Chunk) WriteTo(w io.Writer) (int64, error) {
data, err := c.Data()
if err != nil {
return 0, err
}
return pk.Tuple{
// Heightmaps
pk.NBT(struct {
MotionBlocking []uint64 `nbt:"MOTION_BLOCKING"`
WorldSurface []uint64 `nbt:"WORLD_SURFACE"`
}{
MotionBlocking: c.HeightMaps.MotionBlocking.Raw(),
WorldSurface: c.HeightMaps.MotionBlocking.Raw(),
}),
pk.ByteArray(data),
pk.VarInt(0), // TODO: Block Entity
&lightData{
SkyLightMask: make(pk.BitSet, (16*16*16-1)>>6+1),
BlockLightMask: make(pk.BitSet, (16*16*16-1)>>6+1),
SkyLight: []pk.ByteArray{},
BlockLight: []pk.ByteArray{},
},
}.WriteTo(w)
}
func (c *Chunk) Data() ([]byte, error) {
var buff bytes.Buffer
for _, section := range c.Sections {
_, err := section.WriteTo(&buff)
if err != nil {
return nil, err
}
}
return buff.Bytes(), nil
}
type Section struct {
blockCount int16
States *PaletteContainer
Biomes *PaletteContainer
}
func (s *Section) GetBlock(i int) int {
return s.States.Get(i)
}
func (s *Section) SetBlock(i int, v int) {
// TODO: Handle cave air and void air
if s.States.Get(i) != 0 {
s.blockCount--
}
if v != 0 {
s.blockCount++
}
s.States.Set(i, v)
}
func (s *Section) WriteTo(w io.Writer) (int64, error) {
return pk.Tuple{
pk.Short(s.blockCount),
s.States,
s.Biomes,
}.WriteTo(w)
}
func (s *Section) ReadFrom(r io.Reader) (int64, error) {
return pk.Tuple{
(*pk.Short)(&s.blockCount),
s.States,
s.Biomes,
}.ReadFrom(r)
}
type lightData struct {
SkyLightMask pk.BitSet
BlockLightMask pk.BitSet
SkyLight []pk.ByteArray
BlockLight []pk.ByteArray
}
func bitSetRev(set pk.BitSet) pk.BitSet {
rev := make(pk.BitSet, len(set))
for i := range rev {
rev[i] = ^set[i]
}
return rev
}
func (l *lightData) WriteTo(w io.Writer) (int64, error) {
return pk.Tuple{
pk.Boolean(true), // Trust Edges
l.SkyLightMask,
l.BlockLightMask,
bitSetRev(l.SkyLightMask),
bitSetRev(l.BlockLightMask),
pk.Array(l.SkyLight),
pk.Array(l.BlockLight),
}.WriteTo(w)
}