Vap/web/src/index.js

/*
 * Tencent is pleased to support the open source community by making vap available.
 *
 * Copyright (C) 2020 THL A29 Limited, a Tencent company.  All rights reserved.
 *
 * Licensed under the MIT License (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * http://opensource.org/licenses/MIT
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
import WebglRenderVap from './webgl-render-vap'
let isCanWebGL
/**
 * @param options
 * @constructor
 * @return {null}
 */
export default function(options) {
    if (canWebGL()) {
        return new WebglRenderVap(Object.assign({}, options))
    } else {
        throw new Error('your browser not support webgl')
    }
}

function canWebGL() {
    if (typeof isCanWebGL !== 'undefined') {
        return isCanWebGL
    }
    try {
        if (!window.WebGLRenderingContext) {
            return false
        }
        const canvas = document.createElement('canvas')
        let context = canvas.getContext('webgl') || canvas.getContext('experimental-webgl')

        isCanWebGL = !!context
        context = null
    } catch (err) {
        isCanWebGL = false
    }
    return isCanWebGL
}