Upgrade wasi

build/assets/include/js.h

@@ -2,4 +2,4 @@
 
 #define JS_IMPORT(name) __attribute__((import_module("env"), import_name(#name)))
 #define JS_EXPORT_AS(name) __attribute__((export_name(#name)))
-#define JS_EXPORT __attribute__((visibility("default")))
+#define JS_EXPORT extern "C" __attribute__((visibility("default")))

build/plugins/wasmPlugin.ts

@@ -9,16 +9,20 @@ interface WasmLoaderConfig {
 
 interface CompilerWithFlags {
     cc: string;
+    nm: string;
     flags: string[];
 }
 
-const wasiArchiveURL = 'https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-25/wasi-sdk-25.0-x86_64-linux.tar.gz';
+const WASI_VERSION = '32.0';
-const rtURL = 'https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-25/libclang_rt.builtins-wasm32-wasi-25.0.tar.gz';
+const WASI_MAJOR = WASI_VERSION.split('.')[0];
+const wasiArchiveURL = `https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-${WASI_MAJOR}/wasi-sdk-${WASI_VERSION}-x86_64-linux.tar.gz`;
+const rtURL = `https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-${WASI_MAJOR}/libclang_rt-${WASI_VERSION}.tar.gz`;
 
 const getCompiler = async (): Promise<CompilerWithFlags> => {
     const wasiDir = path.resolve(import.meta.dir, '..', '..', 'dist', 'wasi');
     const cc: CompilerWithFlags = {
         cc: 'clang',
+        nm: 'nm',
         flags: [
             '--target=wasm32',
             '--no-standard-libraries',
@@ -28,7 +32,10 @@ const getCompiler = async (): Promise<CompilerWithFlags> => {
 
     await fs.mkdir(wasiDir, { recursive: true });
 
-    if (!await Bun.file(path.resolve(wasiDir, 'VERSION')).exists()) {
+    const installedVersion = (await Bun.file(path.resolve(wasiDir, 'VERSION')).text().catch(() => '')).slice(0, WASI_VERSION.length);
+
+    if (installedVersion !== WASI_VERSION) {
+        console.log(`WASI version mismatch. Downloading WASI SDK ${wasiArchiveURL}...`)
         const response = await fetch(wasiArchiveURL);
 
         if (!response.ok) {
@@ -37,8 +44,10 @@ const getCompiler = async (): Promise<CompilerWithFlags> => {
 
         const bytes = await response.bytes();
 
+        console.log(`Extracting WASI SDK...`);
         await $`tar -xzv -C ${wasiDir} --strip-components=1 < ${bytes}`;
 
+        console.log(`Downloading libclang_rt.builtins-wasm32-wasi-${WASI_VERSION}.0...`);
         const rtResponse = await fetch(rtURL);
 
         if (!rtResponse.ok) {
@@ -47,12 +56,14 @@ const getCompiler = async (): Promise<CompilerWithFlags> => {
 
         const rtBytes = await rtResponse.bytes();
 
+        console.log(`Extracting libclang_rt.builtins-wasm32-wasi-${WASI_VERSION}.0...`);
         await $`tar -xzv -C ${wasiDir} --strip-components=1 < ${rtBytes}`;
     }
 
     cc.cc = `${path.resolve(wasiDir, 'bin', 'clang')}`;
+    cc.nm = `${path.resolve(wasiDir, 'bin', 'nm')}`;
     cc.flags = [
-        '--target=wasm32-wasi',
+        '--target=wasm32-wasip1',
         `--sysroot=${path.resolve(wasiDir, 'share', 'wasi-sysroot')}`,
     ];
 
@@ -106,12 +117,11 @@ async function instantiate(url: string) {
     const memory = new WebAssembly.Memory({
         initial: 32,
     });
-    const table = new WebAssembly.Table({ initial: 16, element: 'anyfunc' });
     const decoder = new TextDecoder();
     let buf = '';
     let errBuf = '';
     const { instance } = await WebAssembly.instantiateStreaming(fetch(url), {
-        env: { memory, __indirect_function_table: table },
+        env: { memory },
         wasi_snapshot_preview1: new Proxy({
             random_get: (ptr: number, length: number) => {
                 const data = new DataView(memory.buffer);
@@ -164,9 +174,12 @@ async function instantiate(url: string) {
     });
 
     return {
-        ...instance.exports,
+        ...Object.fromEntries(
+            Object.entries(instance.exports)
+                .filter(([k]) => !k.startsWith('_'))
+        ),
         memory,
-        table,
+        table: instance.exports.__indirect_function_table,
         get data() { return new DataView(memory.buffer); },
     };
 }
@@ -227,13 +240,24 @@ const wasmPlugin = ({ production }: WasmLoaderConfig = {}): BunPlugin => {
                         throw new Error('Compile failed, check output');
                     }
 
+                    const symbolsResult = await $`${cc.nm} ${objPath}`.quiet();
+
+                    if (symbolsResult.exitCode !== 0) {
+                        throw new Error('nm failed, check output');
+                    }
+
+                    const exports = symbolsResult.text().split('\n')
+                        .map(l => l.match(/^-+ T ([a-z][a-z0-9_]*)/i))
+                        .filter(m => m != null)
+                        .map(m => m[1]);
+
                     const linkFlags = [
                         '--strip-all',
                         '--lto-O3',
                         '--no-entry',
                         '--import-memory',
-                        '--import-table',
+                        '--export-table',
-                        '--export-dynamic',
+                        ...exports.flatMap(e => ['--export', e]),
                     ].map(f => `-Wl,${f}`);
 
                     const linkResult = await $`${cc.cc} ${flags} -std=gnu23 ${linkFlags} -lstdc++ -nostartfiles -o ${wasmPath} ${objPath} ${stdlib}`;

build/server.ts

@@ -45,6 +45,7 @@ watcher.on('change', async (_, filename) => {
 // ─────────────────────────────────────────────────────────────────────
 
 Bun.serve<ClientData>({
+    idleTimeout: 0,
     websocket: {
         open(ws) {
             const game = ws.data.game;

compile_flags.txt

@@ -1,6 +1,6 @@
---target=wasm32-wasi
+--target=wasm32-wasip1
 --sysroot=dist/wasi/share/wasi-sysroot
--std=c++26
+-std=gnu++26
 -fno-exceptions
 -I
 build/assets/include

src/common/rpg/components/stat.ts

@@ -52,8 +52,6 @@ export class Stat<T = {}> extends Component<StatState & T> {
     removeModifier(delta: number, field: 'value' | 'max' | 'min' = 'value'): void {
         this.applyModifier(-delta, field);
     }
-
-    get current(): number { return this.value; }
 }
 
 @component

src/games/crawler/index.ts

@@ -1,237 +1,183 @@
-import { Color, Glyphs, isCorner, isHorizontal, isVertical, TextRegion } from "@common/display/text";
+import { AlignHorizontal, TextDisplay, TextRegion, type ColorLike } from "@common/display/text";
 import { gameLoop } from "@common/game";
-import type { Point } from "@common/geometry";
 import Input from "@common/input";
-import { BSP } from "@common/level/bsp";
+import { Attacked, Damage } from "@common/rpg/components/combat";
-import { bresenhamCircleGen } from "@common/navigation/bresenham";
+import { Equipment } from "@common/rpg/components/equipment";
-import { SeededRandom } from "@common/random";
+import { Experience, type LevelUpEvent } from "@common/rpg/components/experience";
-import { Factions } from "@common/rpg/components/faction";
+import { Inventory } from "@common/rpg/components/inventory";
-import { getPosition, move, Position } from "@common/rpg/components/position";
+import { Item, Items } from "@common/rpg/components/item";
-import { createViewport } from "@common/rpg/components/render/viewport";
+import { Name } from "@common/rpg/components/name";
-import { Sprite } from "@common/rpg/components/sprite";
+import { getWorldRandom } from "@common/rpg/components/random";
-import { Serialization } from "@common/rpg/core/serialization";
+import { Health } from "@common/rpg/components/stat";
-import { World } from "@common/rpg/core/world";
+import { Entity, World } from "@common/rpg/core/world";
-import { TextDisplaySystem } from "@common/rpg/systems/render/text";
+import { CombatSystem, type HitEvent } from "@common/rpg/systems/combat";
-import { Resources } from "@common/rpg/utils/resources";
+import { capitalize } from "@common/utils";
-import { resolveVariables } from "@common/rpg/utils/variables";
 
-const WALL = '#';
+const createPlayer = (world: World, weapon: Entity): Entity => {
-const PLAYER = '@';
+    const player = world.createEntity();
+    player.add(new Health({ value: 100, max: 100 }));
+    const inv = player.add(new Inventory());
+    player.add(new Equipment('weapon'));
+    player.add(new Experience({ base: 50, factor: 1.5 }));
+    player.add(new Name("Player"));
 
-function createMap(world: World, random: SeededRandom) {
+    inv.add(weapon);
-    const MAP_SIZE = 100;
+    inv.equip(weapon);
-    const mapData = new Array(MAP_SIZE * MAP_SIZE).fill(WALL);
-
-    BSP.generateLevel(MAP_SIZE, MAP_SIZE, (x, y) => { mapData[x + y * MAP_SIZE] = '.'; }, {
-        minWidth: 10,
-        minHeight: 8,
-        depth: 10,
-        random,
-    });
-    const mapDataString: string[] = [];
-    const maskDataString: string[] = [];
-    for (let i = 0; i < MAP_SIZE; i++) {
-        mapDataString.push(mapData.slice(i * MAP_SIZE, (i + 1) * MAP_SIZE).join(''));
-    }
-    for (let i = 0; i < MAP_SIZE * 3; i++) {
-        maskDataString.push(Array.from({ length: MAP_SIZE * 3 }, () => ' ').join(''));
-    }
-
-    const map = world.createEntity('map');
-    map.add(new Sprite(Resources.add('map', new TextRegion(mapDataString))));
-    map.add(new Position(0, 0, -2));
-
-    const mask = world.createEntity('mask');
-    mask.add(new Sprite(Resources.add('mask', new TextRegion(maskDataString))));
-    mask.add(new Position(-MAP_SIZE, -MAP_SIZE, 100));
-
-    return { map, mask };
-}
-
-function createPlayer(world: World, x: number, y: number) {
-    const player = world.createEntity('player');
-    player.add(new Position(x, y, 10));
-    player.add(new Sprite(Resources.add('player', new TextRegion(PLAYER, Color.YELLOW))));
-    Factions.join(player, 'players');
 
     return player;
 }
 
-function createEnemy(world: World, x: number, y: number, sprite: string, ...factions: string[]) {
+const createEnemy = (world: World, level: number): Entity => {
-    const enemy = world.createEntity('enemy_*');
+    const enemy = world.createEntity();
-    enemy.add(new Position(x, y, 9));
+    const inv = enemy.add(new Inventory());
-    enemy.add(new Sprite(sprite));
+    enemy.add(new Equipment('weapon'));
-    factions.forEach(faction => Factions.join(enemy, faction));
+
+    const random = getWorldRandom(world);
+    enemy.add(new Name(random.nextName({ maxLength: 7 }) + ' The Goblin'));
+
+    const hp = random.nextInt(level * 10, level * 20);
+    enemy.add(new Health({ value: hp, max: hp }));
+
+    const attack = random.nextInt(level * 3, level * 6);
+
+    const weaponName = random.choice(['sword', 'axe', 'dagger', 'mace']);
+    const weapon = createWeapon(world, weaponName, attack, level);
+
+    inv.add(weapon);
+    inv.equip(weapon);
 
     return enemy;
 }
 
-function handleMovement() {
+const createWeapon = (world: World, id: string, damage: number, variance: number): Entity => {
-    let dx = 0;
+    const name = id.split(/[-_ ]+/).map(capitalize).join(' ');
-    let dy = 0;
+    const weapon = Items.register(world, `${id}_*`, name, { equippable: { slotType: 'weapon' } });
 
-    const isReleasedOrRepeated = (...keys: Input.KeyCode[]) =>
+    weapon.add(new Damage({ value: damage, variance }));
-        keys.some(key => Input.isReleased(key) || Input.isRepeated(key));
 
-    const left = isReleasedOrRepeated(Input.KeyCode.LEFT, Input.KeyCode.H);
+    return weapon;
-    const right = isReleasedOrRepeated(Input.KeyCode.RIGHT, Input.KeyCode.L);
+}
-    const up = isReleasedOrRepeated(Input.KeyCode.UP, Input.KeyCode.K);
-    const down = isReleasedOrRepeated(Input.KeyCode.DOWN, Input.KeyCode.J);
 
-    const upLeft = isReleasedOrRepeated(Input.KeyCode.Y);
+const drawEntity = (display: TextDisplay, entity: Entity, x: number, y: number, anchorH: AlignHorizontal) => {
-    const upRight = isReleasedOrRepeated(Input.KeyCode.U);
+    const { value: hp, max: maxHp } = entity.get(Health)!;
-    const downLeft = isReleasedOrRepeated(Input.KeyCode.B);
+    let text = `HP: ${hp}/${maxHp}`;
-    const downRight = isReleasedOrRepeated(Input.KeyCode.N);
 
-    if (left) dx -= 1;
+    const xp = entity.get(Experience);
-    if (right) dx += 1;
+    if (xp) {
-    if (up) dy -= 1;
+        text += `\nLevel: ${xp.level}`;
-    if (down) dy += 1;
+        text += `\nXP: ${xp.xp}/${xp.xpForNext}`;
-
-    if (upLeft) {
-        dx -= 1;
-        dy -= 1;
-    }
-    if (upRight) {
-        dx += 1;
-        dy -= 1;
-    }
-    if (downLeft) {
-        dx -= 1;
-        dy += 1;
-    }
-    if (downRight) {
-        dx += 1;
-        dy += 1;
     }
 
-    return { dx, dy };
+    const title = entity.get(Name)?.state ?? entity.id;
+
+    display.drawStringInBox(text, x, y, { title, anchorH });
+
+    const weapon = entity.get(Equipment)!.getItem('weapon');
+
+    if (weapon) {
+        const { value: damage, variance } = weapon.get(Damage)!;
+        const minDamage = damage - variance;
+        const maxDamage = damage + variance;
+        display.drawStringInBox(`Damage: ${minDamage}-${maxDamage}`, x, y + (xp ? 5 : 3), { title: weapon.get(Item)!.name, anchorH });
+    }
 }
 
 export default gameLoop(() => {
-    Input.setRepeatInterval(50);
     const world = new World();
-    const display = world.addSystem(new TextDisplaySystem(100, 25)).display;
 
-    const random = new SeededRandom();
+    world.addSystem(new CombatSystem());
-    const { map, mask } = createMap(world, random);
+    const display = new TextDisplay();
 
-    const mapData = Resources.get(TextRegion, map.get(Sprite)!.image)!;
+    const fists = createWeapon(world, 'fists', 7, 2);
-    const emptyCells: Point[] = [];
+    const player = createPlayer(world, fists);
-    for (let x = 0; x < mapData.width; x++) {
+    const enemy = createEnemy(world, 1);
-        for (let y = 0; y < mapData.height; y++) {
-            if (mapData.get(x, y)[0] === '.') {
-                emptyCells.push({ x, y });
-            }
-        }
-    }
 
-    const maskData = Resources.get(TextRegion, mask.get(Sprite)!.image)!;
+    const log: TextRegion[] = [];
-    const startCell = random.choice(emptyCells);
-
-    const enemyCell = random.choice(emptyCells.filter(c => c !== startCell));
-
-    const viewport = createViewport(world, {
-        width: display.width,
-        height: display.height,
-        worldX: startCell.x - (display.width >> 1),
-        worldY: startCell.y - (display.height >> 1),
-        screenX: 0,
-        screenY: 0,
-    });
-    const player = createPlayer(world, startCell.x, startCell.y);
-
-    Resources.add('goblin', new TextRegion('g', Color.DARK_GREEN));
-    const goblins = Factions.getFaction(world, 'goblins');
-    const monsters = Factions.getFaction(world, 'monsters');
-
-    Factions.setReputationOf(goblins.entity, 'players', -100);
-    Factions.setReputationOf(monsters.entity, 'players', -100);
-
-    Factions.setReputationOf(goblins.entity, 'monsters', 100);
-    Factions.setReputationOf(monsters.entity, 'goblins', 100);
-
-    const enemy = createEnemy(world, enemyCell.x, enemyCell.y, 'goblin', 'goblins', 'monsters');
     const state = {
-        display,
         world,
-        map, mapData,
+        display,
-        mask, maskData, maskDirty: true,
-        random,
-        viewport,
         player,
         enemy,
-        isWall: (x: number, y: number): boolean => {
+        needUpdate: true,
-            const [ch] = state.mapData.get(x, y);
+        blocked: false,
-            return ch === WALL || isVertical(ch) || isHorizontal(ch) || isCorner(ch);
+        log,
-        },
+        addLog(text: string, color?: ColorLike) {
-        updateMask: () => {
+            log.push(new TextRegion(text, color));
-            if (!state.maskDirty) return;
+            if (log.length > 10) {
-
+                log.shift();
-            const { mapData, maskData, player, isWall } = state;
-
-            const playerPos = getPosition(player)!;
-            for (let x = 0; x < mapData.width; x++) {
-                for (let y = 0; y < mapData.height; y++) {
-                    const [ch, fg] = maskData.get(x + mapData.width, y + mapData.height);
-                    if (ch !== ' ' && fg !== Color.GRAY) {
-                        maskData.set(x + mapData.width, y + mapData.height, [mapData.get(x, y)[0], Color.GRAY]);
-                    }
-                }
             }
-            for (const { x, y } of bresenhamCircleGen(playerPos.x, playerPos.y, 10, { fill: 'shadow', breaker: isWall })) {
+            state.needUpdate = true;
-                maskData.set(x + mapData.width, y + mapData.height, '\0');
-            }
-            state.maskDirty = false;
         }
     };
 
-    Factions.setReputationIn(player, 'monsters', 5);
+    world.on<HitEvent>('Combat.hit', ({ target, data }) => {
-    console.log(Factions.getReputation(enemy, player));
+        if (target instanceof Entity) {
+            const targetName = target === player ? "Player" : target.get(Name)?.state ?? target.id;
+            state.addLog(`${targetName} hit by ${data.amount}`);
+        }
+    });
+
+    world.on('Combat.killed', ({ target }) => {
+        if (target instanceof Entity) {
+            target.destroy();
+            player.get(Experience)!.award(10);
+            state.addLog("Enemy killed!");
+        }
+    });
+
+    player.on<LevelUpEvent>('Experience.levelup', ({ data }) => {
+        const health = player.get(Health)!;
+
+        health.applyModifier(Math.round(health.max! * 0.1), 'max');
+        health.set(health.max!);
+
+        state.addLog(`Player leveled up to level ${data.level}`);
+    })
 
     return state;
-}, (dt, state) => {
+}, (_dt, state) => {
-    const {
+    if (Input.isReleased(Input.KeyCode.SPACE, Input.KeyCode.MOUSE_LEFT) && !state.blocked) {
-        world,
+        const weapon = state.player.get(Equipment)!.getItem('weapon')!;
-        viewport,
+        state.enemy.add(new Attacked({ attackerId: state.player.id, sourceId: weapon.id }));
-        player,
+        state.blocked = true;
-        updateMask,
-        isWall,
-    } = state;
 
-    const hasInput = Input.hasReleased() || Input.hasRepeated();
+        setTimeout(() => {
-    const playerPos = getPosition(player)!;
+            if (state.enemy.destroyed) {
-
+                state.enemy = createEnemy(state.world, state.player.get(Experience)!.level);
-    if (hasInput) {
+            } else {
-        if (Input.isHeld(Input.KeyCode.SHIFT)) {
+                const enemyWeapon = state.enemy.get(Equipment)!.getItem('weapon')!;
-        } else {
+                state.player.add(new Attacked({ attackerId: state.enemy.id, sourceId: enemyWeapon.id }));
-            let { dx, dy } = handleMovement();
-
-            if (isWall(playerPos.x + dx, playerPos.y)) {
-                dx = 0;
-            }
-            if (isWall(playerPos.x, playerPos.y + dy)) {
-                dy = 0;
-            }
-            if (isWall(playerPos.x + dx, playerPos.y + dy)) {
-                dx = 0
-                dy = 0;
             }
+            state.blocked = false;
+            state.needUpdate = true;
+        }, 500);
 
-            if (dx || dy) {
+        state.needUpdate = true;
-                move(player, dx, dy);
-                move(viewport, dx, dy);
-
-                playerPos.x + dx;
-                playerPos.y + dy;
-            }
-        }
-
-        // TODO environment step
-
-        state.maskDirty = true;
     }
 
-    updateMask();
+    if (state.needUpdate) {
-    world.update(dt);
+        state.world.update(1);
+
+        state.display.fillBox(
+            0,
+            0,
+            state.display.width,
+            state.display.height,
+            ' ',
+        );
+
+        drawEntity(state.display, state.player, 0, 0, AlignHorizontal.LEFT);
+        if (!state.enemy.destroyed) {
+            drawEntity(state.display, state.enemy, state.display.width - 1, 0, AlignHorizontal.RIGHT);
+        }
+
+        for (let i = 0; i < state.log.length; i++) {
+            const entry = state.log[i];
+            state.display.setRegion(entry, 0, state.display.height - state.log.length + i);
+        }
+
+        state.needUpdate = false;
+    }
+
+    state.display.update();
 });

src/games/playground/awoo.cpp

@@ -4,7 +4,6 @@
 #include <format>
 #include <iostream>
 #include <js.h>
-#include <stdlib.h>
 #include <string>
 #include <utility>
 

src/games/playground/index.tsx

@@ -1,183 +1,5 @@
-import { AlignHorizontal, TextDisplay, TextRegion, type ColorLike } from "@common/display/text";
+import awoo from './awoo.cpp';
-import { gameLoop } from "@common/game";
-import Input from "@common/input";
-import { Attacked, Damage } from "@common/rpg/components/combat";
-import { Equipment } from "@common/rpg/components/equipment";
-import { Experience, type LevelUpEvent } from "@common/rpg/components/experience";
-import { Inventory } from "@common/rpg/components/inventory";
-import { Item, Items } from "@common/rpg/components/item";
-import { Name } from "@common/rpg/components/name";
-import { getWorldRandom } from "@common/rpg/components/random";
-import { Health } from "@common/rpg/components/stat";
-import { Entity, World } from "@common/rpg/core/world";
-import { CombatSystem, type HitEvent } from "@common/rpg/systems/combat";
-import { capitalize } from "@common/utils";
 
-const createPlayer = (world: World, weapon: Entity): Entity => {
+export default function main() {
-    const player = world.createEntity();
+    console.log(awoo);
-    player.add(new Health({ value: 100, max: 100 }));
-    const inv = player.add(new Inventory());
-    player.add(new Equipment('weapon'));
-    player.add(new Experience({ base: 50, factor: 1.5 }));
-    player.add(new Name("Player"));
-
-    inv.add(weapon);
-    inv.equip(weapon);
-
-    return player;
 }
-
-const createEnemy = (world: World, level: number): Entity => {
-    const enemy = world.createEntity();
-    const inv = enemy.add(new Inventory());
-    enemy.add(new Equipment('weapon'));
-
-    const random = getWorldRandom(world);
-    enemy.add(new Name(random.nextName({ maxLength: 7 }) + ' The Goblin'));
-
-    const hp = random.nextInt(level * 10, level * 20);
-    enemy.add(new Health({ value: hp, max: hp }));
-
-    const attack = random.nextInt(level * 3, level * 6);
-
-    const weaponName = random.choice(['sword', 'axe', 'dagger', 'mace']);
-    const weapon = createWeapon(world, weaponName, attack, level);
-
-    inv.add(weapon);
-    inv.equip(weapon);
-
-    return enemy;
-}
-
-const createWeapon = (world: World, id: string, damage: number, variance: number): Entity => {
-    const name = id.split(/[-_ ]+/).map(capitalize).join(' ');
-    const weapon = Items.register(world, `${id}_*`, name, { equippable: { slotType: 'weapon' } });
-
-    weapon.add(new Damage({ value: damage, variance }));
-
-    return weapon;
-}
-
-const drawEntity = (display: TextDisplay, entity: Entity, x: number, y: number, anchorH: AlignHorizontal) => {
-    const { value: hp, max: maxHp } = entity.get(Health)!;
-    let text = `HP: ${hp}/${maxHp}`;
-
-    const xp = entity.get(Experience);
-    if (xp) {
-        text += `\nLevel: ${xp.level}`;
-        text += `\nXP: ${xp.xp}/${xp.xpForNext}`;
-    }
-
-    const title = entity.get(Name)?.state ?? entity.id;
-
-    display.drawStringInBox(text, x, y, { title, anchorH });
-
-    const weapon = entity.get(Equipment)!.getItem('weapon');
-
-    if (weapon) {
-        const { value: damage, variance } = weapon.get(Damage)!;
-        const minDamage = damage - variance;
-        const maxDamage = damage + variance;
-        display.drawStringInBox(`Damage: ${minDamage}-${maxDamage}`, x, y + (xp ? 5 : 3), { title: weapon.get(Item)!.name, anchorH });
-    }
-}
-
-export default gameLoop(() => {
-    const world = new World();
-
-    world.addSystem(new CombatSystem());
-    const display = new TextDisplay();
-
-    const fists = createWeapon(world, 'fists', 7, 2);
-    const player = createPlayer(world, fists);
-    const enemy = createEnemy(world, 1);
-
-    const log: TextRegion[] = [];
-    const state = {
-        world,
-        display,
-        player,
-        enemy,
-        needUpdate: true,
-        blocked: false,
-        log,
-        addLog(text: string, color?: ColorLike) {
-            log.push(new TextRegion(text, color));
-            if (log.length > 10) {
-                log.shift();
-            }
-            state.needUpdate = true;
-        }
-    };
-
-    world.on<HitEvent>('Combat.hit', ({ target, data }) => {
-        if (target instanceof Entity) {
-            const targetName = target === player ? "Player" : target.get(Name)?.state ?? target.id;
-            state.addLog(`${targetName} hit by ${data.amount}`);
-        }
-    });
-
-    world.on('Combat.killed', ({ target }) => {
-        if (target instanceof Entity) {
-            target.destroy();
-            player.get(Experience)!.award(10);
-            state.addLog("Enemy killed!");
-        }
-    });
-
-    player.on<LevelUpEvent>('Experience.levelup', ({ data }) => {
-        const health = player.get(Health)!;
-
-        health.applyModifier(Math.round(health.max! * 0.1), 'max');
-        health.set(health.max!);
-
-        state.addLog(`Player leveled up to level ${data.level}`);
-    })
-
-    return state;
-}, (_dt, state) => {
-    if (Input.isReleased(Input.KeyCode.SPACE, Input.KeyCode.MOUSE_LEFT) && !state.blocked) {
-        const weapon = state.player.get(Equipment)!.getItem('weapon')!;
-        state.enemy.add(new Attacked({ attackerId: state.player.id, sourceId: weapon.id }));
-        state.blocked = true;
-
-        setTimeout(() => {
-            if (state.enemy.destroyed) {
-                state.enemy = createEnemy(state.world, state.player.get(Experience)!.level);
-            } else {
-                const enemyWeapon = state.enemy.get(Equipment)!.getItem('weapon')!;
-                state.player.add(new Attacked({ attackerId: state.enemy.id, sourceId: enemyWeapon.id }));
-            }
-            state.blocked = false;
-            state.needUpdate = true;
-        }, 500);
-
-        state.needUpdate = true;
-    }
-
-    if (state.needUpdate) {
-        state.world.update(1);
-
-        state.display.fillBox(
-            0,
-            0,
-            state.display.width,
-            state.display.height,
-            ' ',
-        );
-
-        drawEntity(state.display, state.player, 0, 0, AlignHorizontal.LEFT);
-        if (!state.enemy.destroyed) {
-            drawEntity(state.display, state.enemy, state.display.width - 1, 0, AlignHorizontal.RIGHT);
-        }
-
-        for (let i = 0; i < state.log.length; i++) {
-            const entry = state.log[i];
-            state.display.setRegion(entry, 0, state.display.height - state.log.length + i);
-        }
-
-        state.needUpdate = false;
-    }
-
-    state.display.update();
-});