anvil chunk to real chunk conversion things

level/anvil/chunk.go

@@ -1,5 +1,14 @@
 package anvil
 
+import (
+	"strings"
+	"unsafe"
+
+	"github.com/admin-else/strom/data"
+	"github.com/admin-else/strom/level"
+	"github.com/admin-else/strom/util"
+)
+
 type Chunk struct {
 	DataVersion      int32
 	Heightmaps       map[string][]int64
@@ -8,17 +17,64 @@ type Chunk struct {
 	Sections         []Section
 }
 
+const McPrefix = "minecraft:"
+
+func (c Chunk) ToStorage(version string) (toChunk *level.Chunk, err error) {
+	f := level.MakeBlockFormat(version)
+	toChunk = new(level.Chunk)
+
+	toChunk.Sections = make([]level.Section, len(c.Sections))
+	for i, s := range c.Sections {
+		pallete := make([]int32, len(s.BlockStates.Palette))
+		for j, p := range s.BlockStates.Palette {
+			pallete[j], err = data.StateIdFromBlocKAndStateMap(version, strings.TrimPrefix(p.Name, McPrefix), p.Properties)
+			if err != nil {
+				return
+			}
+		}
+		// this is probably fine
+		uintSlice := unsafe.Slice((*uint64)(unsafe.Pointer(unsafe.SliceData(s.BlockStates.Data))), len(s.BlockStates.Data))
+
+		toChunk.Sections[i].Blocks, err = f.Import(uintSlice, util.BpeByNum(float64(len(s.BlockStates.Palette))), pallete)
+		if err != nil {
+			return
+		}
+		toChunk.Sections[i].BlockCount = int16(level.CountStorage(toChunk.Sections[i].Blocks, 0))
+	}
+
+	for i, s := range c.Sections {
+		pallete := make([]int32, len(s.Biomes.Palette))
+		for j, p := range s.Biomes.Palette {
+			var b *data.Biome
+			b, ok := data.LookupBiomeByName(version, strings.TrimPrefix(p, McPrefix))
+			if !ok {
+				err = data.UnknownBiomeNameErr
+				return
+			}
+			pallete[j] = b.Id
+		}
+		// this is probably fine
+		uintSlice := unsafe.Slice((*uint64)(unsafe.Pointer(unsafe.SliceData(s.Biomes.Data))), len(s.Biomes.Data))
+
+		toChunk.Sections[i].Biomes, err = f.Import(uintSlice, util.BpeByNum(float64(len(s.BlockStates.Palette))), pallete)
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+
 type Section struct {
 	Y           int8
 	BlockStates struct {
-		Data    []int64
+		Data    []int64 `nbt:"data,omitempty"`
 		Palette []struct {
 			Name       string
 			Properties map[string]string `nbt:"properties,omitempty"`
 		}
 	}
-	Biomes []struct {
-		Data    []int64
+	Biomes struct {
+		Data    []int64 `nbt:"data,omitempty"`
 		Palette []string
 	}
 }