为 LightGame 提供素材转换工具和转换后的头文件

tools/pack_tile_atlas.py

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+"""
+将多个独立 tile PNG 按 JSON 配置打包为 tile atlas，生成 C++ header。
+
+用法:
+    python tools/pack_tile_atlas.py config.json output.h
+
+JSON 格式:
+{
+    "tile_size": 32,
+    "columns": 4,
+    "tiles": [
+        { "id": 0, "file": "empty.png" },
+        { "id": 1, "file": "ground_top.png" },
+        ...
+    ]
+}
+
+- tile_size: 每个 tile 的像素尺寸（正方形）
+- columns: atlas 每行放几个 tile
+- tiles: 按 tile_id 排序的列表，id 从 0 开始连续
+- file: 相对于 config.json 所在目录的 PNG 路径
+- 未指定的 tile_id 自动填充透明
+"""
+
+import json
+import os
+import sys
+import math
+
+from PIL import Image
+
+
+def pack(config_path: str, output_path: str):
+    config_dir = os.path.dirname(os.path.abspath(config_path))
+
+    with open(config_path, "r", encoding="utf-8") as f:
+        cfg = json.load(f)
+
+    tile_size = cfg["tile_size"]
+    columns = cfg["columns"]
+    tiles = cfg["tiles"]
+
+    max_id = max(t["id"] for t in tiles)
+    tile_count = max_id + 1
+    rows = (tile_count + columns - 1) // columns
+
+    atlas_w = columns * tile_size
+    atlas_h = rows * tile_size
+
+    atlas = Image.new("RGBA", (atlas_w, atlas_h), (0, 0, 0, 0))
+
+    tile_map = {t["id"]: t for t in tiles}
+
+    for tid in range(tile_count):
+        col = tid % columns
+        row = tid // columns
+        x = col * tile_size
+        y = row * tile_size
+
+        if tid in tile_map:
+            png_path = os.path.join(config_dir, tile_map[tid]["file"])
+            img = Image.open(png_path).convert("RGBA")
+            if img.size != (tile_size, tile_size):
+                img = img.resize((tile_size, tile_size), Image.NEAREST)
+            atlas.paste(img, (x, y))
+
+    var_name = os.path.splitext(os.path.basename(output_path))[0]
+
+    pixels = list(atlas.getdata())
+    packed = []
+    for r, g, b, a in pixels:
+        packed.append(
+            ((r >> 3) << 11)
+            | ((g >> 3) << 6)
+            | ((b >> 3) << 1)
+            | (1 if a else 0)
+        )
+
+    with open(output_path, "w", encoding="utf-8") as f:
+        f.write("// Auto-generated by tools/pack_tile_atlas.py\n")
+        f.write(f"#pragma once\n#include <cstdint>\n#include \"Image.h\"\n\n")
+        f.write(f"static const int32_t {var_name}_width = {atlas_w};\n")
+        f.write(f"static const int32_t {var_name}_height = {atlas_h};\n")
+        f.write(f"static const int32_t {var_name}_tile_size = {tile_size};\n")
+        f.write(f"static const int32_t {var_name}_columns = {columns};\n\n")
+        f.write(f"static const uint16_t {var_name}_pixels[] = {{\n")
+
+        for i in range(0, len(packed), 16):
+            chunk = packed[i : i + 16]
+            line = ", ".join(f"0x{p:04X}" for p in chunk)
+            f.write(f"    {line},\n")
+
+        f.write("};\n\n")
+        f.write(f"static const RenderData::Image {var_name}_image({var_name}_pixels, {var_name}_width, {var_name}_height);\n")
+
+    print(f"已生成: {output_path}")
+    print(f"  atlas: {atlas_w}x{atlas_h}, {tile_count} tiles ({columns}x{rows})")
+    print(f"  var: {var_name}")
+
+
+def main():
+    if len(sys.argv) < 3:
+        print(f"用法: {sys.argv[0]} config.json output.h")
+        sys.exit(1)
+
+    pack(sys.argv[1], sys.argv[2])
+
+
+if __name__ == "__main__":
+    main()