make game framework more functional

examples/ts_game/src/entity.ts

@@ -1,19 +1,19 @@
 
-export interface HasIdentity  {
+export interface HasIdentity {
     id: number
 }
 
 export interface Drawable<T> {
-    draw: (entity: T) => void 
+    draw: (entity: T) => void
 }
 
 export interface Updatable<T> {
-    update: (entity: T) => void 
+    update: (entity: T) => void
 }
 
 export interface HasResources<T> {
-    load: (entity: T) => void 
-    unload: (entity: T) => void 
+    load: (entity: T) => void
+    unload: (entity: T) => void
 }
 
 export interface HasPosition {
@@ -24,7 +24,7 @@ export interface HasColor {
     color: Color
 }
 
-export type EntityOf<T> = HasIdentity & Partial<HasResources<T>> & Partial<Updatable<T>> & Partial<Drawable<T>> & T
+export type EntityOf<T> = HasIdentity & Partial<HasResources<EntityOf<T>>> & Partial<Updatable<EntityOf<T>>> & Partial<Drawable<EntityOf<T>>> & T
 
 let ID = 0
 export const makeEntity = () => ({
@@ -32,13 +32,16 @@ export const makeEntity = () => ({
 })
 
 export const makePosition = (x = 0, y = 0) => ({
-    position: new Vector2(x,y)
+    position: new Vector2(x, y)
 })
 
 export const makeColorRgb = (r = 255, g = 255, b = 255, a = 255) => ({
-    color: new Color(r,g,b,a)
+    color: new Color(r, g, b, a)
 })
 
 export const makeColorClone = (c = WHITE) => ({
-    color: new Color(c.r,c.g,c.b,c.a)
+    color: new Color(c.r, c.g, c.b, c.a)
 })
+
+
+

examples/ts_game/src/game.ts

@@ -1,4 +1,9 @@
+import { EntityOf } from "./entity";
+import { resourceUnloadAll } from "./resource";
+
 const promiseUpdateList: (()=>boolean)[] = []
+const entitiyList: EntityOf<any>[] = []
+
 
 const dispatchPromises = () => {
     for (var i = promiseUpdateList.length - 1; i >= 0; i--) {
@@ -23,34 +28,37 @@ export const makeUpdateablePromise = (updateFn: () => boolean) => {
     return promise
 }
 
+export const entityAdd = (entity: EntityOf<any>) => {
+    if (entity.load) entity.load(entity)
+    entitiyList.push(entity)
+}
 
-export abstract class Game {
-    public clearColor = BLACK
-    private quit = false
-
-    constructor(public readonly width: number, 
-        public readonly height: number, 
-        public readonly title: string){
+export const entityRemove = (entity: EntityOf<any>) => {
+    // TODO: Do this cached
+    const i = entitiyList.findIndex(x => x.id === entity.id)
+    if (i !== -1) {
+        const e = entitiyList[i]
+        if (e.unload) e.unload(entity)
+        entitiyList.splice(i, 1)
     }
+}
 
-    public run(){
-        initWindow(this.width,this.height,this.title)
-        setTargetFPS(60)
-        this.load()
-        while(!(this.quit = windowShouldClose())){
-            dispatchPromises()
-            this.update()
-            beginDrawing()
-            clearBackground(this.clearColor)
-            this.draw()
-            endDrawing()
+export const runGame = (width: number, height: number, title: string, startupCallback: () => void) => {
+    initWindow(width, height, title)
+    setTargetFPS(60)
+    startupCallback()
+    while(!windowShouldClose()){
+        dispatchPromises()
+        for (const entity of entitiyList) {
+            if (entity.update) entity.update(entity)
         }
-        this.unload()
-        closeWindow()
+        beginDrawing()
+        clearBackground(BLACK)
+        for (const entity of entitiyList) {
+            if (entity.draw) entity.draw(entity)
+        }
+        endDrawing()
     }
-
-    abstract draw(): void;
-    abstract update(): void;
-    abstract load(): void;
-    abstract unload(): void;
+    resourceUnloadAll()
+    closeWindow()
 }

examples/ts_game/src/index.ts

@@ -1,47 +1,23 @@
 import { fadeIn, fadeOut, wait } from "./animation";
-import { EntityOf } from "./entity";
-import { Game, makeUpdateablePromise } from "./game";
+import { entityAdd, entityRemove, runGame } from "./game";
 import { TextEntity, makeTextEntity } from "./text";
 
-class MyGame<T> extends Game {
-    entities: EntityOf<T>[] = []
-
-    draw(): void {
-        for (const entity of this.entities) {
-            if(entity.draw) entity.draw(entity)
-        }
-    }
-    update(): void {
-        for (const entity of this.entities) {
-            if(entity.update) entity.update(entity)
-        }
-    }
-    load(): void {
-    }
-    unload(): void {
-    }
-
-    addEntity(entity: EntityOf<T>){
-        this.entities.push(entity)
-    }
-}
-
-const game = new MyGame<TextEntity>(800,450,"Typescript Game")
-
-const main = async () => {
+runGame(800,400, "Typescript Game", async () => {
     const text = <TextEntity>{ 
         ...makeTextEntity("Welcome to rayjs!"),
         size: 80,
-        position: new Vector2(100, game.height/2 - 40)
+        position: new Vector2(100, getScreenHeight()/2 - 40),
+        font: 'resources/anonymous_pro_bold.ttf'
     }
-    game.addEntity(text)
-    await fadeIn(text, 2)
-    await wait(2)
-    await fadeOut(text, 2)
-    text.position.x += 75
-    text.text = "This Summer!"
-    await fadeIn(text, 2)
-}
-
-main()
-game.run()
+    let quit = false
+    entityAdd(text)
+    while(!quit){
+        await fadeIn(text, 2)
+        await wait(2)
+        await fadeOut(text, 2)
+        text.text = "This Summer!"
+        await fadeIn(text, 2)
+        await fadeOut(text, 3)
+        entityRemove(text)
+    }
+})

examples/ts_game/src/resource.ts

@@ -0,0 +1,47 @@
+type ResourceType = 'texture' | 'image' | 'shader' | 'font'
+
+const resourceList = new Map<string, Resource>()
+
+interface Resource {
+    refcount: number,
+    id: string,
+    resource: any
+    unload: (t: any) => void
+}
+
+function loadResourceFunc<T>(loader: (filename: string) => T, unloader: (resource: T) => void){
+    return (filename: string) => {
+        if(resourceList.has(filename)){
+            const res = resourceList.get(filename)
+            res!.refcount++
+            return <T>res?.resource
+        } else {
+            traceLog(LOG_INFO, "here")
+            const resource = loader(filename)
+            traceLog(LOG_INFO, <string>resource)
+            resourceList.set(filename, {
+                refcount: 1,
+                id: filename,
+                resource: resource,
+                unload: unloader
+            })
+            return resource
+        }
+    }
+}
+export const resourceUnload = (id: string) => {
+    const res = resourceList.get(id)
+    if(res){
+        res.refcount--
+        if(res.refcount === 0){
+            res.unload(res.resource)
+        }
+    }
+}
+export const resourceUnloadAll = () => {
+    for (const res of resourceList.entries()) {
+        res[1].unload(res[1].resource)
+    }
+}
+export const textureLoad = loadResourceFunc<Texture>(loadTexture,unloadTexture)
+export const fontLoad = loadResourceFunc<Font>(loadFont,unloadFont)

examples/ts_game/src/text.ts

@@ -1,34 +1,41 @@
 import { EntityOf, HasColor, HasPosition, makeColorRgb, makeEntity, makePosition } from "./entity"
+import { fontLoad, resourceUnload } from "./resource"
 
 export interface Text extends HasPosition, HasColor {
     text: string,
-    font: Font,
+    font?: string,
     size: number,
     spacing: number
 }
 
 export interface TextEntity extends EntityOf<Text> {
     type: "text"
+    fontResource?: Font
 }
 
-export const makeText = (text = "", size = 20, font = null, spacing = 1) => (<Text>{
+export const makeText = (text = "", size = 20, font: string | null = null, spacing = 1) => (<Text>{
     ...makePosition(),
     ...makeColorRgb(),
     text: text,
-    font: font === null ? getFontDefault() : loadFont(font),
+    font: font,
     size: size,
     spacing: spacing
 })
 
-export const textDraw = (t: Text) => {
-    return drawTextEx(t.font, t.text, t.position, t.size, t.spacing, t.color);
+export const textDrawFn = (t: TextEntity) => drawTextEx(t.fontResource!, t.text, t.position, t.size, t.spacing, t.color);
+export const textLoadFn = (t: TextEntity) => {
+    t.fontResource = (t.font ? fontLoad(t.font) : getFontDefault())
+    return
 }
+export const textUnloadFn = (t: TextEntity) => t.font ? resourceUnload(t.font) : undefined
 
 export const makeTextEntity = (text: string = "") => (<TextEntity>{
     ...makeEntity(),
     ...makeText(text),
     type: "text",
-    draw: textDraw,
+    draw: textDrawFn,
+    load: textLoadFn,
+    unload: textUnloadFn
 })