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ChunkColumn.js
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ChunkColumn.js
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const SmartBuffer = require('smart-buffer').SmartBuffer
const BitArray = require('../common/BitArrayNoSpan')
const ChunkSection = require('../common/PaletteChunkSection')
const BiomeSection = require('../common/PaletteBiome')
const CommonChunkColumn = require('../common/CommonChunkColumn')
const constants = require('../common/constants')
const neededBits = require('../common/neededBits')
// wrap with func to provide version specific Block
module.exports = (Block, mcData) => {
return class ChunkColumn extends CommonChunkColumn {
static get section () { return ChunkSection }
constructor (options) {
super(mcData)
this.minY = options?.minY ?? 0
this.worldHeight = options?.worldHeight ?? constants.CHUNK_HEIGHT
this.numSections = this.worldHeight >> 4
this.maxBitsPerBlock = neededBits(Object.values(mcData.blocks).reduce((high, block) => Math.max(high, block.maxStateId), 0))
this.maxBitsPerBiome = neededBits(Object.values(mcData.biomes).length)
this.sections = options?.sections ?? Array.from(
{ length: this.numSections }, _ => new ChunkSection({ maxBitsPerBlock: this.maxBitsPerBlock })
)
this.biomes = options?.biomes ?? Array.from(
{ length: this.numSections }, _ => new BiomeSection()
)
this.skyLightMask = options?.skyLightMask ?? new BitArray({
bitsPerValue: 1,
capacity: this.numSections + 2
})
this.emptySkyLightMask = options?.emptySkyLightMask ?? new BitArray({
bitsPerValue: 1,
capacity: this.numSections + 2
})
this.skyLightSections = options?.skyLightSections ?? Array(
this.numSections + 2
).fill(null)
this.blockLightMask = options?.blockLightMask ?? new BitArray({
bitsPerValue: 1,
capacity: this.numSections + 2
})
this.emptyBlockLightMask = options?.emptyBlockLightMask ?? new BitArray({
bitsPerValue: 1,
capacity: this.numSections + 2
})
this.blockLightSections = options?.blockLightSections ?? Array(
this.numSections + 2
).fill(null)
this.blockEntities = options?.blockEntities ?? {}
}
toJson () {
return JSON.stringify({
worldHeight: this.worldHeight,
minY: this.minY,
sections: this.sections.map(section => section.toJson()),
biomes: this.biomes.map(biome => biome.toJson()),
skyLightMask: this.skyLightMask.toLongArray(),
emptySkyLightMask: this.emptySkyLightMask.toLongArray(),
skyLightSections: this.skyLightSections.map(section => section === null ? null : section.toJson()),
blockLightMask: this.blockLightMask.toLongArray(),
emptyBlockLightMask: this.emptyBlockLightMask.toLongArray(),
blockLightSections: this.blockLightSections.map(section => section === null ? null : section.toJson()),
blockEntities: this.blockEntities
})
}
static fromJson (j) {
const parsed = JSON.parse(j)
return new ChunkColumn({
worldHeight: parsed.worldHeight,
minY: parsed.minY,
sections: parsed.sections.map(s => ChunkSection.fromJson(s)),
biomes: parsed.biomes.map(s => BiomeSection.fromJson(s)),
blockEntities: parsed.blockEntities,
skyLightMask: BitArray.fromLongArray(parsed.skyLightMask, 1),
emptySkyLightMask: BitArray.fromLongArray(parsed.emptyBlockLightMask, 1),
skyLightSections: parsed.skyLightSections.map(s => s === null ? null : BitArray.fromJson(s)),
blockLightMask: BitArray.fromLongArray(parsed.blockLightMask, 1),
emptyBlockLightMask: BitArray.fromLongArray(parsed.emptySkyLightMask, 1),
blockLightSections: parsed.blockLightSections.map(s => s === null ? null : BitArray.fromJson(s))
})
}
initialize (func) {
const p = { x: 0, y: 0, z: 0 }
for (p.y = 0; p.y < this.worldHeight; p.y++) {
for (p.z = 0; p.z < constants.SECTION_WIDTH; p.z++) {
for (p.x = 0; p.x < constants.SECTION_WIDTH; p.x++) {
const block = func(p.x, p.y, p.z)
if (block !== null) { this.setBlock(p, block) }
}
}
}
}
getBlock (pos) {
const stateId = this.getBlockStateId(pos)
const biome = this.getBiome(pos)
const block = Block.fromStateId(stateId, biome)
block.light = this.getBlockLight(pos)
block.skyLight = this.getSkyLight(pos)
block.entity = this.getBlockEntity(pos)
return block
}
setBlock (pos, block) {
if (typeof block.stateId !== 'undefined') {
this.setBlockStateId(pos, block.stateId)
}
if (typeof block.biome !== 'undefined') {
this.setBiome(pos, block.biome.id)
}
if (typeof block.skyLight !== 'undefined') {
this.setSkyLight(pos, block.skyLight)
}
if (typeof block.light !== 'undefined') {
this.setBlockLight(pos, block.light)
}
// TODO: assert here if setting a block that should have an associated block entity
if (block.entity) {
this.setBlockEntity(pos, block.entity)
} else {
this.removeBlockEntity(pos)
}
}
getBlockType (pos) {
const blockStateId = this.getBlockStateId(pos)
return mcData.blocksByStateId[blockStateId].id
}
getBlockData (pos) {
const blockStateId = this.getBlockStateId(pos)
return mcData.blocksByStateId[blockStateId].metadata
}
getBlockStateId (pos) {
const section = this.sections[(pos.y - this.minY) >> 4]
return section ? section.get(toSectionPos(pos, this.minY)) : 0
}
getBlockLight (pos) {
const section = this.blockLightSections[getLightSectionIndex(pos, this.minY)]
return section ? section.get(getSectionBlockIndex(pos, this.minY)) : 0
}
getSkyLight (pos) {
const section = this.skyLightSections[getLightSectionIndex(pos, this.minY)]
return section ? section.get(getSectionBlockIndex(pos, this.minY)) : 0
}
getBiome (pos) {
const biome = this.biomes[(pos.y - this.minY) >> 4]
return biome ? biome.get(toBiomePos(pos, this.minY)) : 0
}
setBlockType (pos, id) {
this.setBlockStateId(pos, mcData.blocks[id].minStateId)
}
setBlockData (pos, data) {
this.setBlockStateId(pos, mcData.blocksByStateId[this.getBlockStateId(pos)].minStateId + data)
}
setBlockStateId (pos, stateId) {
const section = this.sections[(pos.y - this.minY) >> 4]
if (section) { section.set(toSectionPos(pos, this.minY), stateId) }
}
setBlockLight (pos, light) {
const sectionIndex = getLightSectionIndex(pos, this.minY)
let section = this.blockLightSections[sectionIndex]
if (section === null) {
if (light === 0) {
return
}
section = new BitArray({
bitsPerValue: 4,
capacity: 4096
})
if (sectionIndex > this.blockLightMask.capacity) {
this.blockLightMask = this.blockLightMask.resize(sectionIndex)
}
this.blockLightMask.set(sectionIndex, 1)
this.blockLightSections[sectionIndex] = section
}
section.set(getSectionBlockIndex(pos, this.minY), light)
}
setSkyLight (pos, light) {
const sectionIndex = getLightSectionIndex(pos, this.minY)
let section = this.skyLightSections[sectionIndex]
if (section === null) {
if (light === 0) {
return
}
section = new BitArray({
bitsPerValue: 4,
capacity: 4096
})
this.skyLightMask.set(sectionIndex, 1)
this.skyLightSections[sectionIndex] = section
}
section.set(getSectionBlockIndex(pos, this.minY), light)
}
setBiome (pos, biomeId) {
const biome = this.biomes[(pos.y - this.minY) >> 4]
if (biome) { biome.set(toBiomePos(pos), biomeId) }
}
getMask () {
return undefined
}
dump () {
const smartBuffer = new SmartBuffer()
for (let i = 0; i < this.numSections; ++i) {
this.sections[i].write(smartBuffer)
this.biomes[i].write(smartBuffer)
}
return smartBuffer.toBuffer()
}
loadBiomes (biomes) {
}
dumpBiomes (biomes) {
return undefined
}
load (data) {
const reader = SmartBuffer.fromBuffer(data)
for (let i = 0; i < this.numSections; ++i) {
this.sections[i] = ChunkSection.read(reader, this.maxBitsPerBlock)
this.biomes[i] = BiomeSection.read(reader, this.maxBitsPerBiome)
}
}
loadParsedLight (skyLight, blockLight, skyLightMask, blockLightMask, emptySkyLightMask, emptyBlockLightMask) {
function readSection (sections, data, lightMask, pLightMask, emptyMask, pEmptyMask) {
let currentSectionIndex = 0
const incomingLightMask = BitArray.fromLongArray(pLightMask, 1)
const incomingEmptyMask = BitArray.fromLongArray(pEmptyMask, 1)
for (let y = 0; y < sections.length; y++) {
const isEmpty = incomingEmptyMask.get(y)
if (!incomingLightMask.get(y) && !isEmpty) { continue }
emptyMask.set(y, isEmpty)
lightMask.set(y, 1 - isEmpty)
const bitArray = new BitArray({
bitsPerValue: 4,
capacity: 4096
})
sections[y] = bitArray
if (!isEmpty) {
const sectionReader = Buffer.from(data[currentSectionIndex++])
bitArray.readBuffer(SmartBuffer.fromBuffer(sectionReader))
}
}
}
readSection(this.skyLightSections, skyLight, this.skyLightMask, skyLightMask, this.emptySkyLightMask, emptySkyLightMask)
readSection(this.blockLightSections, blockLight, this.blockLightMask, blockLightMask, this.emptyBlockLightMask, emptyBlockLightMask)
}
_loadBlockLightNibbles (y, buffer) {
if (buffer.length !== 2048) throw new Error('Invalid light nibble buffer length ' + buffer.length)
const minCY = this.minY >> 4
this.blockLightMask.set(y + minCY + 1, 1) // minCY + 1 extra layer below
this.blockLightSections[y - (this.minY >> 4) + 1] = new BitArray({
bitsPerValue: 4,
capacity: 4096,
data: new Int8Array(buffer).buffer
})
}
_loadSkyLightNibbles (y, buffer) {
if (buffer.length !== 2048) throw new Error('Invalid light nibble buffer length: ' + buffer.length)
const minCY = this.minY >> 4
this.skyLightMask.set(y + minCY + 1, 1) // minCY + 1 extra layer below
this.skyLightSections[y - minCY + 1] = new BitArray({
bitsPerValue: 4,
capacity: 4096,
data: new Int8Array(buffer).buffer
})
}
// Loads an disk serialized chunk
loadSection (y, blockStates, biomes, blockLight, skyLight) {
const minCY = Math.abs(this.minY >> 4)
const raiseUnknownBlock = block => { throw new Error(`Failed to map ${JSON.stringify(block)} to a block state ID`) }
// TOOD: we should probably not fail, but because we use numerical biome IDs in pchunk we need to fail
const raiseUnknownBiome = biome => { throw new Error(`Failed to map ${JSON.stringify(biome)} to a biome ID`) }
this.sections[y + minCY] = ChunkSection.fromLocalPalette({
data: BitArray.fromLongArray(blockStates.data || {}, blockStates.bitsPerBlock),
palette: blockStates.palette
.map(e => Block.fromProperties(e.Name.replace('minecraft:', ''), e.Properties || {}) ?? raiseUnknownBlock(e))
.map(e => e.stateId)
})
this.biomes[y + minCY] = BiomeSection.fromLocalPalette({
data: BitArray.fromLongArray(biomes.data || {}, biomes.bitsPerBiome),
palette: biomes.palette
.map(e => mcData.biomesByName[e.replace('minecraft:', '')] ?? raiseUnknownBiome(e))
.map(e => e.id)
})
if (blockLight) this._loadBlockLightNibbles(y, blockLight)
if (skyLight) this._loadSkyLightNibbles(y, skyLight)
}
dumpLight () {
const skyLight = []
const blockLight = []
this.skyLightSections.forEach((section, index) => {
if (section !== null && this.skyLightMask.get(index)) {
const smartBuffer = new SmartBuffer()
section.writeBuffer(smartBuffer)
skyLight.push(Uint8Array.from(smartBuffer.toBuffer()))
}
})
this.blockLightSections.forEach((section, index) => {
if (section !== null && this.blockLightMask.get(index)) {
const smartBuffer = new SmartBuffer()
section.writeBuffer(smartBuffer)
blockLight.push(Uint8Array.from(smartBuffer.toBuffer()))
}
})
return {
skyLight,
blockLight,
skyLightMask: this.skyLightMask.toLongArray(),
blockLightMask: this.blockLightMask.toLongArray(),
emptySkyLightMask: this.emptySkyLightMask.toLongArray(),
emptyBlockLightMask: this.emptyBlockLightMask.toLongArray()
}
}
}
}
function getLightSectionIndex (pos, minY) {
return Math.floor((pos.y - minY) / 16) + 1
}
function toBiomePos (pos, minY) {
return { x: pos.x >> 2, y: ((pos.y - minY) & 0xF) >> 2, z: pos.z >> 2 }
}
function toSectionPos (pos, minY) {
return { x: pos.x, y: (pos.y - minY) & 0xF, z: pos.z }
}
function getSectionBlockIndex (pos, minY) {
return (((pos.y - minY) & 15) << 8) | (pos.z << 4) | pos.x
}