Support ktx2 loader

package.json

@@ -7,7 +7,7 @@
     "preinstall": "npx only-allow pnpm",
     "test": "cross-env TS_NODE_PROJECT=tsconfig.tests.json floss --path tests -r ts-node/register",
     "test-debug": "cross-env TS_NODE_PROJECT=tsconfig.tests.json floss --path tests -r ts-node/register --debug",
-    "test-cov": "cross-env TS_NODE_PROJECT=tsconfig.tests.json nyc --reporter=lcov floss --path tests -r ts-node/register",
+    "test-cov": "cross-env TS_NODE_PROJECT=tsconfig.tests.json IS_COV=1 nyc --reporter=lcov floss --path tests -r ts-node/register",
     "build": "npm run b:module && npm run b:types",
     "lint": "eslint packages/*/src --ext .ts",
     "watch": "cross-env NODE_ENV=development BUILD_TYPE=MODULE rollup -cw -m inline",

packages/core/src/Engine.ts

@@ -565,16 +565,23 @@ export class Engine extends EventDispatcher {
    */
   protected _initialize(configuration: EngineConfiguration): Promise<Engine> {
     const physics = configuration.physics;
+    const initializePromises: Promise<any>[] = [];
     if (physics) {
-      return physics.initialize().then(() => {
-        PhysicsScene._nativePhysics = physics;
-        this._nativePhysicsManager = physics.createPhysicsManager();
-        this._physicsInitialized = true;
-        return this;
-      });
-    } else {
-      return Promise.resolve(this);
+      initializePromises.push(
+        physics.initialize().then(() => {
+          PhysicsScene._nativePhysics = physics;
+          this._nativePhysicsManager = physics.createPhysicsManager();
+          this._physicsInitialized = true;
+          return this;
+        })
+      );
+    }
+    const loaders = ResourceManager._loaders;
+    for (let key in loaders) {
+      const loader = loaders[key];
+      if (loader.initialize) initializePromises.push(loader.initialize(this, configuration));
     }
+    return Promise.all(initializePromises).then(() => this);
   }
 
   private _createSpriteMaterial(): Material {

packages/core/src/asset/AssetType.ts

@@ -35,6 +35,8 @@ export enum AssetType {
   KTX = "KTX",
   /** Cube Compress Texture. */
   KTXCube = "KTXCube",
+  /** KTX2 Compress Texture */
+  KTX2 = "KTX2",
   /** Sprite. */
   Sprite = "Sprite",
   /** Sprite Atlas. */

packages/core/src/asset/Loader.ts

@@ -1,3 +1,4 @@
+import { Engine, EngineConfiguration } from "../Engine";
 import { AssetPromise } from "./AssetPromise";
 import { LoadItem } from "./LoadItem";
 import { request, RequestConfig } from "./request";
@@ -27,7 +28,7 @@ export abstract class Loader<T> {
   private static _engineObjects: { [key: string]: any } = {};
 
   constructor(public readonly useCache: boolean) {}
-
-  request: <U>(url: string, config: RequestConfig) => AssetPromise<U> = request;
+  initialize?(engine: Engine, configuration: EngineConfiguration): Promise<void>;
   abstract load(item: LoadItem, resourceManager: ResourceManager): AssetPromise<T> | Record<string, AssetPromise<any>>;
+  request: <U>(url: string, config: RequestConfig) => AssetPromise<U> = request;
 }

packages/core/src/asset/ResourceManager.ts

@@ -9,8 +9,8 @@ import { ReferResource } from "./ReferResource";
  * ResourceManager
  */
 export class ResourceManager {
-  /** Loader collection. */
-  private static _loaders: { [key: string]: Loader<any> } = {};
+  /** @internal */
+  static _loaders: { [key: string]: Loader<any> } = {};
   private static _extTypeMapping: { [key: string]: string } = {};
 
   /**

packages/core/src/texture/enums/TextureFormat.ts

@@ -2,61 +2,61 @@
  * Texture format enumeration.
  */
 export enum TextureFormat {
-  /** RGB format,8 bits per channel. */
+  /** RGB format, 8 bits per channel. */
   R8G8B8,
-  /** RGBA format,8 bits per channel. */
+  /** RGBA format, 8 bits per channel. */
   R8G8B8A8,
-  /** RGBA format,4 bits per channel. */
+  /** RGBA format, 4 bits per channel. */
   R4G4B4A4,
-  /** RGBA format,5 bits in R channel,5 bits in G channel,5 bits in B channel, 1 bit in A channel. */
+  /** RGBA format, 5 bits in R channel, 5 bits in G channel, 5 bits in B channel, 1 bit in A channel. */
   R5G5B5A1,
-  /** RGB format,5 bits in R channel,6 bits in G channel,5 bits in B channel. */
+  /** RGB format, 5 bits in R channel, 6 bits in G channel, 5 bits in B channel. */
   R5G6B5,
-  /** Transparent format,8 bits. */
+  /** Transparent format, 8 bits. */
   Alpha8,
   /** Luminance/alpha in RGB channel, alpha in A channel. */
   LuminanceAlpha,
-  /** RGBA format,16 bits per channel. */
+  /** RGBA format, 16 bits per channel. */
   R16G16B16A16,
-  /** RGBA format,32 bits per channel. */
+  /** RGBA format, 32 bits per channel. */
   R32G32B32A32,
 
-  /** RGB compressed format。*/
+  /** RGB compressed format. */
   DXT1,
-  /** RGBA compressed format。*/
+  /** RGBA compressed format. */
   DXT5,
-  /** RGB compressed format,4 bits per pixel。*/
+  /** RGB compressed format, 4 bits per pixel. */
   ETC1_RGB,
-  /** RGB compressed format,4 bits per pixel。*/
+  /** RGB compressed format, 4 bits per pixel. */
   ETC2_RGB,
-  /** RGBA compressed format,5 bits per pixel,4 bit in RGB, 1 bit in A. */
+  /** RGBA compressed format, 5 bits per pixel, 4 bit in RGB, 1 bit in A. */
   ETC2_RGBA5,
-  /** RGB compressed format,8 bits per pixel. */
+  /** RGB compressed format, 8 bits per pixel. */
   ETC2_RGBA8,
-  /** RGB compressed format,2 bits per pixel. */
+  /** RGB compressed format, 2 bits per pixel. */
   PVRTC_RGB2,
-  /** RGBA compressed format,2 bits per pixel. */
+  /** RGBA compressed format, 2 bits per pixel. */
   PVRTC_RGBA2,
-  /** RGB compressed format,4 bits per pixel. */
+  /** RGB compressed format, 4 bits per pixel. */
   PVRTC_RGB4,
-  /** RGBA compressed format,4 bits per pixel. */
+  /** RGBA compressed format, 4 bits per pixel. */
   PVRTC_RGBA4,
-  /** RGB(A) compressed format,128 bits per 4x4 pixel block. */
+  /** RGB(A) compressed format, 128 bits per 4x4 pixel block. */
   ASTC_4x4,
-  /** RGB(A) compressed format,128 bits per 5x5 pixel block. */
+  /** RGB(A) compressed format, 128 bits per 5x5 pixel block. */
   ASTC_5x5,
-  /** RGB(A) compressed format,128 bits per 6x6 pixel block. */
+  /** RGB(A) compressed format, 128 bits per 6x6 pixel block. */
   ASTC_6x6,
-  /** RGB(A) compressed format,128 bits per 8x8 pixel block. */
+  /** RGB(A) compressed format, 128 bits per 8x8 pixel block. */
   ASTC_8x8,
-  /** RGB(A) compressed format,128 bits per 10x10 pixel block. */
+  /** RGB(A) compressed format, 128 bits per 10x10 pixel block. */
   ASTC_10x10,
-  /** RGB(A) compressed format,128 bits per 12x12 pixel block. */
+  /** RGB(A) compressed format, 128 bits per 12x12 pixel block. */
   ASTC_12x12,
 
-  /** Automatic depth format,engine will automatically select the supported precision. */
+  /** Automatic depth format, engine will automatically select the supported precision. */
   Depth,
-  /** Automatic depth setncil format, engine will automatically select the supported precision. */
+  /** Automatic depth stencil format, engine will automatically select the supported precision. */
   DepthStencil,
   /** 16-bit depth format. */
   Depth16,

packages/loader/src/index.ts

@@ -1,3 +1,4 @@
+import "./AnimationClipLoader";
 import "./AnimatorControllerLoader";
 import "./BufferLoader";
 import "./EnvLoader";
@@ -14,11 +15,13 @@ import "./SpriteAtlasLoader";
 import "./SpriteLoader";
 import "./Texture2DLoader";
 import "./TextureCubeLoader";
-import "./AnimationClipLoader";
+import "./ktx2/KTX2Loader";
 
-export { parseSingleKTX } from "./compressed-texture";
 export type { GLTFParams } from "./GLTFLoader";
-export * from "./resource-deserialize";
 export * from "./SceneLoader";
 export type { Texture2DParams } from "./Texture2DLoader";
+export { parseSingleKTX } from "./compressed-texture";
 export * from "./gltf";
+export { KTX2Loader } from "./ktx2/KTX2Loader";
+export { KTX2TargetFormat } from "./ktx2/KTX2TargetFormat";
+export * from "./resource-deserialize";