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Tnze
2022-03-09 17:21:28 +08:00
parent aa8e611644
commit 0bbd279dd1
8 changed files with 73 additions and 34320 deletions
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33857
data/block/block.go
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152
data/block/gen_block.go
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@ -1,152 +0,0 @@
//go:build generate
// +build generate
// gen_blocks.go generates block information.
package main
import (
"encoding/json"
"fmt"
"net/http"
"os"
"text/template"
"github.com/iancoleman/strcase"
)
const (
version = "1.17"
infoURL = "https://raw.githubusercontent.com/PrismarineJS/minecraft-data/master/data/pc/" + version + "/blocks.json"
//language=gohtml
blockTmpl = `// Code generated by gen_block.go; DO NOT EDIT.
// Package block stores information about blocks in Minecraft.
package block
import (
"math/bits"
)
// BitsPerBlock indicates how many bits are needed to represent all possible
// block states. This value is used to determine the size of the global palette.
var BitsPerBlock = bits.Len(uint(len(StateID)))
// ID describes the numeric ID of a block.
type ID uint32
// Block describes information about a type of block.
type Block struct {
ID ID
DisplayName string
Name string
Hardness float64
Diggable bool
DropIDs []uint32
NeedsTools map[uint32]bool
MinStateID uint32
MaxStateID uint32
Transparent bool
FilterLightLevel int
EmitLightLevel int
}
var (
{{- range .}}
{{.CamelName}} = Block{
ID: {{.ID}},
DisplayName: "{{.DisplayName}}",
Name: "{{.Name}}",
Hardness: {{.Hardness}},
Diggable: {{.Diggable}},
DropIDs: []uint32{ {{- range .DropIDs}}{{.}},{{end -}} },
NeedsTools: map[uint32]bool{ {{- range $key, $val := .NeedsTools}}{{$key}}: {{$val}},{{end -}} },
MinStateID: {{.MinStateID}},
MaxStateID: {{.MaxStateID}},
Transparent: {{.Transparent}},
FilterLightLevel: {{.FilterLightLevel}},
EmitLightLevel: {{.EmitLightLevel}},
}{{end}}
)
// ByID is an index of minecraft blocks by their ID.
var ByID = map[ID]*Block{ {{range .}}
{{.ID}}: &{{.CamelName}},{{end}}
}
// StateID maps all possible state IDs to a corresponding block ID.
var StateID = map[uint32]ID{ {{range $block := .}}
{{- range .States}}
{{.}}: {{$block.ID}},
{{- end}}{{end}}
}`
)
type Block struct {
ID uint32 `json:"id"`
CamelName string `json:"-"`
DisplayName string `json:"displayName"`
Name string `json:"name"`
Hardness float64 `json:"hardness"`
Diggable bool `json:"diggable"`
DropIDs []uint32 `json:"drops"`
NeedsTools map[uint32]bool `json:"harvestTools"`
MinStateID uint32 `json:"minStateId"`
MaxStateID uint32 `json:"maxStateId"`
Transparent bool `json:"transparent"`
FilterLightLevel int `json:"filterLight"`
EmitLightLevel int `json:"emitLight"`
}
func (b Block) States() []uint32 {
if b.MinStateID == b.MaxStateID {
return []uint32{b.MinStateID}
}
states := make([]uint32, 0)
for i := b.MinStateID; i <= b.MaxStateID; i++ {
states = append(states, i)
}
return states
}
func downloadInfo() ([]*Block, error) {
resp, err := http.Get(infoURL)
if err != nil {
return nil, err
}
defer resp.Body.Close()
var data []*Block
if err := json.NewDecoder(resp.Body).Decode(&data); err != nil {
return nil, err
}
for _, d := range data {
d.CamelName = strcase.ToCamel(d.Name)
}
return data, nil
}
//go:generate go run $GOFILE
//go:generate go fmt block.go
func main() {
fmt.Println("generating block.go")
blocks, err := downloadInfo()
if err != nil {
panic(err)
}
f, err := os.Create("block.go")
if err != nil {
panic(err)
}
defer f.Close()
if err := template.Must(template.New("").Parse(blockTmpl)).Execute(f, blocks); err != nil {
panic(err)
}
}

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examples/genmaps/colors.gob
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219
examples/genmaps/genmaps.go
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@ -1,219 +0,0 @@
package main
import (
"flag"
"fmt"
"image"
"image/color"
"image/draw"
"log"
"os"
"path/filepath"
"runtime"
"strings"
"sync"
"unsafe"
"github.com/Tnze/go-mc/data/block"
"github.com/Tnze/go-mc/level"
"github.com/Tnze/go-mc/save"
"github.com/Tnze/go-mc/save/region"
)
var colors []color.RGBA64
var sectionWorkerNum = 1
var (
regionWorkerNum = flag.Int("workers", runtime.NumCPU(), "worker numbers")
regionsFold = flag.String("region", filepath.Join(os.Getenv("AppData"), ".minecraft", "saves", "World", "region"), "region directory path")
drawBigPicture = flag.Bool("bigmap", true, "draw the big map")
)
func main() {
flag.Parse()
de, err := os.ReadDir(*regionsFold)
if err != nil {
log.Fatal(err)
}
var min, max [2]int
updateMinMax := func(pos [2]int) {
mkmax(&max[0], &pos[0])
mkmax(&max[1], &pos[1])
mkmin(&min[0], &pos[0])
mkmin(&min[1], &pos[1])
}
if *drawBigPicture {
for _, dir := range de {
name := dir.Name()
var pos [2]int // {x, z}
if _, err := fmt.Sscanf(name, "r.%d.%d.mca", &pos[0], &pos[1]); err != nil {
log.Printf("Error parsing file name of %s: %v, ignoring", name, err)
continue
}
updateMinMax(pos)
}
}
type regions struct {
pos [2]int
*region.Region
}
// Open mca files
var rs = make(chan regions, *regionWorkerNum)
go func() {
for _, dir := range de {
name := dir.Name()
path := filepath.Join(*regionsFold, name)
var pos [2]int // {x, z}
if _, err := fmt.Sscanf(name, "r.%d.%d.mca", &pos[0], &pos[1]); err != nil {
log.Printf("Error parsing file name of %s: %v, ignoring", name, err)
continue
}
r, err := region.Open(path)
if err != nil {
log.Printf("Error when opening %s: %v, ignoring", name, err)
continue
}
rs <- regions{pos: pos, Region: r}
}
close(rs)
}()
var bigPicture *image.RGBA
if *drawBigPicture {
bigPicture = image.NewRGBA(image.Rect(min[0]*512, min[1]*512, max[0]*512+512, max[1]*512+512))
}
var bigWg sync.WaitGroup
// draw columns
for r := range rs {
img := image.NewRGBA(image.Rect(0, 0, 32*16, 32*16))
type task struct {
data []byte
pos [2]int
}
c := make(chan task)
var wg sync.WaitGroup
for i := 0; i < *regionWorkerNum; i++ {
go func() {
var column save.Chunk
for task := range c {
if err := column.Load(task.data); err != nil {
log.Printf("UnmarshalNBT column (%d.%d) error: %v", task.pos[0], task.pos[1], err)
}
//pos := [2]int{int(column.Level.PosX), int(column.Level.PosZ)}
//if pos != task.pos {
// fmt.Printf("chunk position not match: want %v, get %v\n", task.pos, pos)
//}
draw.Draw(
img, image.Rect(task.pos[0]*16, task.pos[1]*16, task.pos[0]*16+16, task.pos[1]*16+16),
drawColumn(&column), image.Pt(0, 0),
draw.Over,
)
wg.Done()
}
}()
}
for x := 0; x < 32; x++ {
for z := 0; z < 32; z++ {
if !r.ExistSector(x, z) {
continue
}
data, err := r.ReadSector(x, z)
if err != nil {
log.Printf("Read sector (%d.%d) error: %v", x, z, err)
}
wg.Add(1)
c <- task{data: data, pos: [2]int{x, z}}
}
}
close(c)
wg.Wait()
// Save pictures
bigWg.Add(1)
log.Print("Draw: ", r.pos)
go func(img image.Image, pos [2]int) {
savePng(img, fmt.Sprintf("r.%d.%d.png", pos[0], pos[1]))
if *drawBigPicture {
draw.Draw(
bigPicture, image.Rect(pos[0]*512, pos[1]*512, pos[0]*512+512, pos[1]*512+512),
img, image.Pt(0, 0), draw.Src,
)
}
bigWg.Done()
}(img, r.pos)
// To close mca files
if err := r.Close(); err != nil {
log.Printf("Close r.%d.%d.mca error: %v", r.pos[0], r.pos[1], err)
}
}
bigWg.Wait()
if *drawBigPicture {
savePng(bigPicture, "maps.png")
}
}
func drawColumn(column *save.Chunk) (img *image.RGBA) {
img = image.NewRGBA(image.Rect(0, 0, 16, 16))
s := column.Sections
c := make(chan *save.Section)
var wg sync.WaitGroup
for i := 0; i < sectionWorkerNum; i++ {
go func() {
for s := range c {
drawSection(s, img)
wg.Done()
}
}()
}
defer close(c)
wg.Add(len(s))
for i := range s {
c <- &s[i]
}
wg.Wait()
return
}
func drawSection(s *save.Section, img *image.RGBA) {
data := *(*[]uint64)((unsafe.Pointer)(&s.BlockStates.Data))
palette := s.BlockStates.Palette
rawPalette := make([]int, len(palette))
for i, v := range palette {
// TODO: Consider the properties of block, not only index the block name
rawPalette[i] = int(stateIDs[strings.TrimPrefix(v.Name, "minecraft:")])
}
c := level.NewStatesPaletteContainerWithData(16*16*16, data, rawPalette)
for y := 0; y < 16; y++ {
layerImg := image.NewRGBA(image.Rect(0, 0, 16, 16))
for i := 16*16 - 1; i >= 0; i-- {
var bid block.ID
bid = block.ID(c.Get(i))
c := colors[block.ByID[bid].ID]
layerImg.Set(i%16, i/16, c)
}
draw.Draw(
img, image.Rect(0, 0, 16, 16),
layerImg, image.Pt(0, 0),
draw.Over,
)
}
return
}
// TODO: This map should be moved to data/block.
var stateIDs map[string]uint32
func init() {
for i, v := range block.StateID {
name := block.ByID[v].Name
if _, ok := stateIDs[name]; !ok {
stateIDs[name] = i
}
}
}

56
examples/genmaps/util_funcs.go
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@ -1,56 +0,0 @@
package main
import (
"bytes"
_ "embed"
"encoding/gob"
"github.com/Tnze/go-mc/data/block"
"image"
"image/png"
"log"
"os"
)
func savePng(img image.Image, name string) {
f, err := os.Create(name)
if err != nil {
log.Fatal(err)
}
if err := png.Encode(f, img); err != nil {
f.Close()
log.Fatal(err)
}
if err := f.Close(); err != nil {
log.Fatal(err)
}
}
//go:embed colors.gob
var colorsBin []byte // gob([]color.RGBA64)
func init() {
if err := gob.NewDecoder(bytes.NewReader(colorsBin)).Decode(&colors); err != nil {
panic(err)
}
}
func mkmax(c, n *int) {
if *c < *n {
*c = *n
}
}
func mkmin(c, n *int) {
if *c > *n {
*c = *n
}
}
var idByName = make(map[string]uint32, len(block.ByID))
func init() {
for _, v := range block.ByID {
idByName["minecraft:"+v.Name] = uint32(v.ID)
}
}

49
level/block/block.go
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@ -5,6 +5,7 @@ import (
"compress/zlib"
_ "embed"
"fmt"
"math/bits"
"github.com/Tnze/go-mc/nbt"
)
@ -17,21 +18,20 @@ type Block interface {
//go:embed block_states.nbt
var blockStates []byte
var toStateID = make(map[Block]int)
var toStateID map[Block]int
var fromStateID []Block
func init() {
regState := func(s Block) {
if _, ok := toStateID[s]; ok {
panic(fmt.Errorf("state %#v already exist", s))
}
toStateID[s] = len(fromStateID)
fromStateID = append(fromStateID, s)
}
var states []struct {
// BitsPerBlock indicates how many bits are needed to represent all possible
// block states. This value is used to determine the size of the global palette.
var BitsPerBlock int
type State struct {
Name string
Properties nbt.RawMessage
}
}
func init() {
var states []State
// decompress
z, err := zlib.NewReader(bytes.NewReader(blockStates))
if err != nil {
@ -41,6 +41,8 @@ func init() {
if _, err = nbt.NewDecoder(z).Decode(&states); err != nil {
panic(err)
}
toStateID = make(map[Block]int, len(states))
fromStateID = make([]Block, 0, len(states))
for _, state := range states {
block := fromID[state.Name]
if state.Properties.Type != nbt.TagEnd {
@ -49,14 +51,29 @@ func init() {
panic(err)
}
}
regState(block)
if _, ok := toStateID[block]; ok {
panic(fmt.Errorf("state %#v already exist", block))
}
toStateID[block] = len(fromStateID)
fromStateID = append(fromStateID, block)
}
BitsPerBlock = bits.Len(uint(len(fromStateID)))
}
func FromStateID(stateID int) Block {
return fromStateID[stateID]
func FromStateID(stateID int) (b Block, ok bool) {
if stateID >= 0 && stateID < len(fromStateID) {
b = fromStateID[stateID]
ok = true
}
return
}
func ToStateID(b Block) int {
return toStateID[b]
func DefaultBlock(id string) (b Block, ok bool) {
b, ok = fromID[id]
return
}
func ToStateID(b Block) (i int, ok bool) {
i, ok = toStateID[b]
return
}

41
level/chunk.go
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@ -2,13 +2,14 @@ package level
import (
"bytes"
"fmt"
"io"
"math/bits"
"strings"
"sync"
"unsafe"
"github.com/Tnze/go-mc/data/block"
"github.com/Tnze/go-mc/level/block"
pk "github.com/Tnze/go-mc/net/packet"
"github.com/Tnze/go-mc/save"
)
@ -113,11 +114,18 @@ func ChunkFromSave(c *save.Chunk, secs int) *Chunk {
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" {
b := v.Block()
if b == nil {
panic(fmt.Errorf("block not found: %#v", v))
}
if !isAir(b) {
blockCount++
}
var ok bool
stateRawPalette[i], ok = block.ToStateID(b)
if !ok {
panic(fmt.Errorf("state id not found: %#v", b))
}
}
biomesData := *(*[]uint64)((unsafe.Pointer)(&v.Biomes.Data))
@ -153,18 +161,6 @@ func ChunkFromSave(c *save.Chunk, secs int) *Chunk {
}
}
// 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 {
@ -211,8 +207,8 @@ 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 {
b, _ := block.FromStateID(s.States.Get(i))
if isAir(b) {
s.blockCount--
}
if v != 0 {
@ -263,3 +259,12 @@ func (l *lightData) WriteTo(w io.Writer) (int64, error) {
pk.Array(l.BlockLight),
}.WriteTo(w)
}
func isAir(b block.Block) bool {
switch b.(type) {
case block.Air, block.CaveAir, block.VoidAir:
return true
default:
return false
}
}

17
save/chunk.go
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@ -5,8 +5,10 @@ import (
"compress/gzip"
"compress/zlib"
"errors"
"github.com/Tnze/go-mc/nbt"
"io"
"github.com/Tnze/go-mc/level/block"
"github.com/Tnze/go-mc/nbt"
)
// Chunk is 16* chunk
@ -45,6 +47,19 @@ type BlockState struct {
Properties nbt.RawMessage
}
func (s *BlockState) Block() block.Block {
b, ok := block.DefaultBlock(s.Name)
if !ok {
return nil
}
if s.Properties.Type != nbt.TagEnd {
if err := s.Properties.Unmarshal(&b); err != nil {
return nil
}
}
return b
}
// Load read column data from []byte
func (c *Chunk) Load(data []byte) (err error) {
var r io.Reader = bytes.NewReader(data[1:])