up3

server/internal/packbuilder/items.go

@@ -0,0 +1,70 @@
+package packbuilder
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/df-mc/dragonfly/server/world"
+	"image"
+	"image/png"
+	"os"
+	"path/filepath"
+	"strings"
+	_ "unsafe" // Imported for compiler directives.
+)
+
+// buildItems builds all the item-related files for the resource pack. This includes textures, language
+// entries and item atlas.
+func buildItems(dir string) (count int, lang []string) {
+	if err := os.Mkdir(filepath.Join(dir, "items"), os.ModePerm); err != nil {
+		panic(err)
+	}
+	if err := os.MkdirAll(filepath.Join(dir, "textures/items"), os.ModePerm); err != nil {
+		panic(err)
+	}
+
+	textureData := make(map[string]any)
+	for _, item := range world.CustomItems() {
+		identifier, _ := item.EncodeItem()
+		lang = append(lang, fmt.Sprintf("item.%s.name=%s", identifier, item.Name()))
+
+		name := strings.Split(identifier, ":")[1]
+		textureData[identifier] = map[string]string{"textures": fmt.Sprintf("textures/items/%s.png", name)}
+
+		buildItemTexture(dir, name, item.Texture())
+
+		count++
+	}
+
+	buildItemAtlas(dir, map[string]any{
+		"resource_pack_name": "vanilla",
+		"texture_name":       "atlas.items",
+		"texture_data":       textureData,
+	})
+	return
+}
+
+// buildItemTexture creates a PNG file for the item from the provided image and name and writes it to the pack.
+func buildItemTexture(dir, name string, img image.Image) {
+	texture, err := os.Create(filepath.Join(dir, "textures/items", name+".png"))
+	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)
+	}
+}
+
+// buildItemAtlas creates the identifier to texture mapping and writes it to the pack.
+func buildItemAtlas(dir string, atlas map[string]any) {
+	b, err := json.Marshal(atlas)
+	if err != nil {
+		panic(err)
+	}
+	if err := os.WriteFile(filepath.Join(dir, "textures/item_texture.json"), b, 0666); err != nil {
+		panic(err)
+	}
+}