[oden] Assets becomes async load in terms of IO/GFX

src/assets.ts

@@ -1,5 +1,7 @@
-import * as core from "asset-core";
+import * as io from "./io.ts";
+import * as gfx from "./graphics.ts";
 
-export function load_texture(path: string): number {
-  return core.load_texture(path);
+export async function load_texture(path: string): Promise<number> {
+  const buffer = await io.load(path);
+  return gfx.create_texture(buffer, path);
 }

src/main.ts

@@ -1,18 +1,22 @@
 import { cls, print, spr, use_texture } from "./graphics.ts";
 import { load_texture } from "./assets.ts";
 
-let the_texture = 0;
+let the_texture: number | undefined = undefined;
 
 export function init() {
   print("Hello world!");
-  // TODO: Async IO
-  the_texture = load_texture("./src/happy-tree.png");
+
+  // Start this load, but then...
+  load_texture("./src/happy-tree.png").then((n) => (the_texture = n));
 }
 
 export function update() {}
 
 export function draw() {
   cls(0.1, 0.2, 0.3);
-  use_texture(the_texture);
-  spr((320 - 256) / 2, 0, 256, 240, 0, 0);
+  if (the_texture != undefined) {
+    // ...it gets resolved here?
+    use_texture(the_texture);
+    spr((320 - 256) / 2, 0, 256, 240, 0, 0);
+  }
 }

types/asset-core.d.ts

@@ -1 +1,3 @@
+// These are the functions exposed by the native assets module.
+//
 export function load_texture(path: string): number;