111 lines
2.2 KiB
Markdown
111 lines
2.2 KiB
Markdown
# Lua game package format
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A game package is a manifest plus Lua scripts and optional assets.
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Typical structure:
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```text
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assets/games/<gameId>/
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manifest.json
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scripts/
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main.lua
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state.lua
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ui.lua
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runtime_defs.lua
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assets/
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image.png
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audio/
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click.wav
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```
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## Manifest modules
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Lua modules must be declared in `manifest.json`.
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```json
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{
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"id": "template",
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"version": "0.1.0",
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"entry": "main",
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"modules": {
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"main": "scripts/main.lua",
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"state": "scripts/state.lua",
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"ui": "scripts/ui.lua",
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"runtime_ui": "runtime:runtime_ui.lua",
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"runtime_widgets": "runtime:runtime_widgets.lua",
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"runtime_commands": "runtime:runtime_commands.lua",
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"layout": "runtime:layout.lua"
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}
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}
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```
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Lua imports by module name:
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```lua
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local ui = runtime.import("ui")
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local widgets = runtime.import("runtime_widgets")
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```
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Do not use `require`, `package`, `dofile`, `loadfile`, or `os`.
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## Path rules
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Package-local module paths:
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```text
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scripts/*.lua
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```
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Runtime shared module paths:
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```text
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runtime:*.lua
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```
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`runtime:` paths must not contain `/`, `..`, or an empty filename.
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## Entry module
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The manifest `entry` module should expose lifecycle/event functions expected by the script engine. Keep game-specific state in Lua modules and return runtime diffs/commands through the approved protocol.
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## Runtime helper modules
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Shared helpers are provided by the runtime package:
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```text
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assets/runtime/lua/runtime_ui.lua
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assets/runtime/lua/runtime_widgets.lua
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assets/runtime/lua/runtime_commands.lua
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assets/runtime/lua/layout.lua
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```
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Use helpers for authoring convenience, but remember helpers must normalize into supported Runtime protocol nodes/commands before Dart validation.
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## Generated Lua definitions
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`runtime_defs.lua` files are generated from common definitions. After changing helper APIs, run:
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```bash
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dart run tool/generate_lua_runtime_defs.dart
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```
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Check without rewriting:
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```bash
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dart run tool/generate_lua_runtime_defs.dart --check
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```
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## Package validation
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A host repository can validate a game package with:
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```bash
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dart run tool/check_runtime_package.dart assets/games/template packages/flame_lua_runtime/assets/runtime/lua
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```
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Within this package repo, example game packages live under:
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```text
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example/assets/games/
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```
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