app/node_modules/@babylonjs/loaders/glTF/2.0/Extensions/KHR_materials_specular.js

import { PBRMaterial } from "@babylonjs/core/Materials/PBR/pbrMaterial.js";
import { GLTFLoader } from "../glTFLoader.js";
import { Color3 } from "@babylonjs/core/Maths/math.color.js";
const NAME = "KHR_materials_specular";
/**
 * [Specification](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Khronos/KHR_materials_specular/README.md)
 */
// eslint-disable-next-line @typescript-eslint/naming-convention
export class KHR_materials_specular {
    /**
     * @internal
     */
    constructor(loader) {
        /**
         * The name of this extension.
         */
        this.name = NAME;
        /**
         * Defines a number that determines the order the extensions are applied.
         */
        this.order = 190;
        this._loader = loader;
        this.enabled = this._loader.isExtensionUsed(NAME);
    }
    /** @internal */
    dispose() {
        this._loader = null;
    }
    /**
     * @internal
     */
    loadMaterialPropertiesAsync(context, material, babylonMaterial) {
        return GLTFLoader.LoadExtensionAsync(context, material, this.name, (extensionContext, extension) => {
            const promises = new Array();
            promises.push(this._loader.loadMaterialPropertiesAsync(context, material, babylonMaterial));
            promises.push(this._loadSpecularPropertiesAsync(extensionContext, extension, babylonMaterial));
            return Promise.all(promises).then(() => { });
        });
    }
    _loadSpecularPropertiesAsync(context, properties, babylonMaterial) {
        if (!(babylonMaterial instanceof PBRMaterial)) {
            throw new Error(`${context}: Material type not supported`);
        }
        const promises = new Array();
        if (properties.specularFactor !== undefined) {
            babylonMaterial.metallicF0Factor = properties.specularFactor;
        }
        if (properties.specularColorFactor !== undefined) {
            babylonMaterial.metallicReflectanceColor = Color3.FromArray(properties.specularColorFactor);
        }
        if (properties.specularTexture) {
            properties.specularTexture.nonColorData = true;
            promises.push(this._loader.loadTextureInfoAsync(`${context}/specularTexture`, properties.specularTexture, (texture) => {
                texture.name = `${babylonMaterial.name} (Specular F0 Strength)`;
                babylonMaterial.metallicReflectanceTexture = texture;
                babylonMaterial.useOnlyMetallicFromMetallicReflectanceTexture = true;
            }));
        }
        if (properties.specularColorTexture) {
            promises.push(this._loader.loadTextureInfoAsync(`${context}/specularColorTexture`, properties.specularColorTexture, (texture) => {
                texture.name = `${babylonMaterial.name} (Specular F0 Color)`;
                babylonMaterial.reflectanceTexture = texture;
            }));
        }
        return Promise.all(promises).then(() => { });
    }
}
GLTFLoader.RegisterExtension(NAME, (loader) => new KHR_materials_specular(loader));
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