up3

server/internal/packbuilder/blocks.go

@@ -0,0 +1,81 @@
+package packbuilder
+
+import (
+	"encoding/json"
+	"fmt"
+	"image"
+	"image/png"
+	"os"
+	"path/filepath"
+	"strings"
+	_ "unsafe" // Imported for compiler directives.
+
+	"github.com/df-mc/dragonfly/server/world"
+)
+
+// buildBlocks builds all the block-related files for the resource pack. This includes textures, geometries, language
+// entries and terrain texture atlas.
+func buildBlocks(reg world.BlockRegistry, dir string) (count int, lang []string) {
+	if err := os.MkdirAll(filepath.Join(dir, "models/blocks"), os.ModePerm); err != nil {
+		panic(err)
+	}
+	if err := os.MkdirAll(filepath.Join(dir, "textures/blocks"), os.ModePerm); err != nil {
+		panic(err)
+	}
+
+	textureData := make(map[string]any)
+	for identifier, blk := range reg.CustomBlocks() {
+		b, ok := blk.(world.CustomBlockBuildable)
+		if !ok {
+			continue
+		}
+
+		name := strings.Split(identifier, ":")[1]
+		lang = append(lang, fmt.Sprintf("tile.%s.name=%s", identifier, b.Name()))
+		for name, texture := range b.Textures() {
+			textureData[name] = map[string]string{"textures": "textures/blocks/" + name}
+			buildBlockTexture(dir, name, texture)
+		}
+		if b.Geometry() != nil {
+			if err := os.WriteFile(filepath.Join(dir, "models/blocks", fmt.Sprintf("%s.geo.json", name)), b.Geometry(), 0666); err != nil {
+				panic(err)
+			}
+		}
+		count++
+	}
+
+	buildBlockAtlas(dir, map[string]any{
+		"resource_pack_name": "vanilla",
+		"texture_name":       "atlas.terrain",
+		"padding":            8,
+		"num_mip_levels":     4,
+		"texture_data":       textureData,
+	})
+	return
+}
+
+// buildBlockTexture creates a PNG file for the block from the provided image and name and writes it to the pack.
+func buildBlockTexture(dir, name string, img image.Image) {
+	texture, err := os.Create(filepath.Join(dir, fmt.Sprintf("textures/blocks/%s.png", name)))
+	if err != nil {
+		panic(err)
+	}
+	if err := png.Encode(texture, img); err != nil {
+		_ = texture.Close()
+		panic(err)
+	}
+	if err := texture.Close(); err != nil {
+		panic(err)
+	}
+}
+
+// buildBlockAtlas creates the identifier to texture mapping and writes it to the pack.
+func buildBlockAtlas(dir string, atlas map[string]any) {
+	b, err := json.Marshal(atlas)
+	if err != nil {
+		panic(err)
+	}
+	if err := os.WriteFile(filepath.Join(dir, "textures/terrain_texture.json"), b, 0666); err != nil {
+		panic(err)
+	}
+}