188 lines
8.1 KiB
Markdown
188 lines
8.1 KiB
Markdown
# Station
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A persistent-world, RPG-style station simulation inspired by Space Station 13, built
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with [Bevy](https://bevy.org) in Rust.
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- **ECS** – all game state lives in Bevy entities and components.
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- **Data driven** – items, recipes, buildings and skills are defined in
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[rsn](https://crates.io/crates/rsn) files under `assets/data/`.
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- **Scriptable** – behaviour is written in [Rune](https://rune-rs.github.io) scripts
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under `assets/scripts/`.
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- **Tiled maps** – maps are regular [Tiled](https://www.mapeditor.org) `.tmx` files.
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- **Persistent world** – no rounds. The world and every character (inventory, skills,
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vitals, position) are saved and restored across restarts.
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- **Singleplayer and multiplayer** – one authoritative server simulation, used locally
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in singleplayer and over UDP in multiplayer
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([bevy_replicon](https://crates.io/crates/bevy_replicon) + renet).
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## Crates
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| Crate | Purpose |
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|----------------------|-------------------------------------------------------------------------|
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| `crates/game_core` | Shared data definitions, components, Tiled loader, network protocol |
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| `crates/game_server` | Authoritative simulation, Rune scripting, persistence, `game-server` binary |
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| `crates/game_client` | Rendering, UI and input (`game` binary); embeds the server for singleplayer/host |
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The client never changes game state directly. It sends requests (`Login`, `SetMoveDir`,
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`Interact`, `Craft`, …) and the server replicates the resulting state back. In
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singleplayer the same server systems run inside the client process, so singleplayer and
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multiplayer behave identically.
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## Running
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```sh
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cargo run # singleplayer (world: saves/singleplayer.rsn)
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cargo run -- --host 5000 # singleplayer world that others can join
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cargo run -- --connect 127.0.0.1:5000 # join a server or host
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cargo run -p game_server --bin game-server # dedicated server (world: saves/server.rsn)
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```
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Client options: `--name NAME`, `--save FILE`, `--no-save`, `--map MAP`.
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Server options: `--port PORT`, `--save FILE`, `--no-save`, `--map MAP`.
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On Windows, release builds of the client open no console window, so command-line
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output such as `--help` and logs isn't shown. Use a debug build to see it.
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The world autosaves periodically and on exit (window close, Ctrl-C, SIGTERM).
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Characters are identified by name and are restored when that name logs in again.
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## Controls
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| Key | Action |
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|---------------------|------------------------------------------------------|
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| WASD / arrows | Move (you face the direction you move) |
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| E | Pick up (own tile, otherwise the faced tile) |
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| F / left click | Interact with the faced / clicked building |
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| U | Use the selected item (eat, heal, …) |
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| G | Drop the selected item |
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| X | Deconstruct the faced building |
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| 1–9, 0, mouse wheel | Select an inventory slot |
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| C / B | Crafting / build menu (W/S select, Enter confirm, Esc close) |
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| H | Help |
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## Modding
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All content is loaded from `assets/` at startup. Every `.rsn` file below `assets/data/`
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(recursively) may contain any mix of `items`, `recipes`, `buildings` and `skills`, so a
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feature can ship in a single file. References between prototypes and script hooks are
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validated at load time and errors name the offending file and id.
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### Items
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```rsn
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items: [
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{ id: "apple", name: "Apple", sprite: "sprites/items/apple.png", max_stack: 10,
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tags: ["food"], on_use: Some("food::eat"), consume_on_use: true,
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props: { "nutrition": 15 } },
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]
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```
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Required: `id`, `name`, `sprite`. Optional: `description`, `max_stack` (default 50),
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`tags`, `on_use` (script hook), `consume_on_use`, `props` (numbers readable by scripts).
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### Recipes
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```rsn
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recipes: [
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{ id: "smelt_iron", name: Some("Smelt iron plate"),
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inputs: [("iron_ore", 2)], outputs: [("iron_plate", 1)],
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tools: [], station: Some("furnace"),
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skill: Some({ skill: "smithing", level: 1 }), xp: 10 },
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]
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```
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Required: `id`, `inputs`, `outputs`. Optional: `name`, `tools` (needed but not consumed),
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`station` (a tag provided by a building adjacent to the player), `skill`, `xp`, `on_craft`
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(script hook). Ingredients are written as `("item", count)` or `{ item: "item", count: n }`.
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### Buildings
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Anything placed on the grid: walls, doors, machines, trees, rocks.
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```rsn
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buildings: [
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{ id: "door", name: "Door", sprite: "sprites/buildings/door_closed.png",
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variants: { "open": "sprites/buildings/door_open.png" },
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construction: Some({ materials: [("iron_plate", 2), ("plank", 1)],
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tools: ["screwdriver"], xp: 10,
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skill: Some({ skill: "construction", level: 1 }) }),
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on_interact: Some("door::toggle") },
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]
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```
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Required: `id`, `name`, `sprite`. Optional: `description`, `variants` (name → sprite),
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`solid` (default true), `max_health`, `stations` (tags for recipes), `construction`
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(makes it buildable from the build menu), `deconstructible` (default true; refunds
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materials), `on_interact` (script hook), `vars` (integer state, persisted per building).
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### Skills
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```rsn
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skills: [ { id: "smithing", name: "Smithing" } ]
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```
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### Scripts
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Each `.rn` file in `assets/scripts/` is a module named after its path
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(`scripts/door.rn` → `door`, `scripts/npc/guard.rn` → `npc::guard`). Data files refer to
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public functions as `"module::function"`. Every hook receives one argument, `ctx`;
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returning `false` signals failure (for example, a used item is then not consumed).
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Script errors are logged and have no effect on the world.
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```rune
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// assets/scripts/door.rn
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pub fn toggle(ctx) {
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if ctx.is_solid() {
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ctx.set_solid(false);
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ctx.set_variant("open");
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ctx.message("You open the door.");
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} else {
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ctx.set_solid(true);
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ctx.set_variant("");
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ctx.message("You close the door.");
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}
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}
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```
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`ctx` methods:
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| Area | Methods |
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|-----------|---------|
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| Actor | `actor_name()`, `message(text)` |
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| Inventory | `item_count(id)`, `has_item(id, n)`, `give_item(id, n)`, `take_item(id, n) -> bool`, `spawn_item(id, n)` (on the ground) |
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| Vitals | `health()`, `max_health()`, `heal(n)`, `damage(n)`, `nutrition()`, `feed(n)` (integers) |
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| Skills | `skill_level(id)`, `add_xp(id, n)` |
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| Used item | `item_id()`, `item_prop(key)` |
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| Building | `target_name()`, `get_var(key)`, `set_var(key, n)`, `is_solid()`, `set_solid(b)`, `variant()`, `set_variant(name)` (`""` = default sprite), `destroy_target()` |
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| Misc | `random(max)` → `0..max` |
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### Maps (Tiled)
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Maps are orthogonal `.tmx` files with embedded or external tilesets. Each map cell is one
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game tile (drawn at 32×32; 32 px tilesets look best).
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- Tile layers are rendered in order. A tile is solid if the tile has the boolean custom
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property `solid = true` in its tileset, or its layer has `solid = true`.
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- Object layers spawn gameplay entities by object **class**:
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- `spawn` – player spawn point.
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- `building` – custom property `proto` = building id; any integer properties
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override the building's `vars`.
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- `item` – custom property `proto` = item id and optional `count`.
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- Objects are placed on the tile containing their position (point objects work well).
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A map is only used to create a new world; after that the save file is authoritative.
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Delete the save file to start a fresh world.
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`tools/gen_placeholder_assets.py` regenerates the placeholder sprites and example map.
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## Development
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```sh
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cargo nextest run --workspace # unit tests + headless full-simulation test
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cargo clippy --workspace --all-targets
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```
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Tests run with [cargo-nextest](https://nexte.st) (`cargo install cargo-nextest --locked`);
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its configuration is in `.config/nextest.toml`. CI uses `--profile ci`, which writes a
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JUnit report to `target/nextest/ci/junit.xml`.
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