ZhongMianAdmin/__test__/bim/js/utils/WebGL.js

class WEBGL {
    static isWebGLAvailable() {
        try {
            const canvas = document.createElement('canvas')
            return !!(window.WebGLRenderingContext && (canvas.getContext('webgl') || canvas.getContext('experimental-webgl')))
        } catch (e) {
            return false
        }
    }

    static isWebGL2Available() {
        try {
            const canvas = document.createElement('canvas')
            return !!(window.WebGL2RenderingContext && canvas.getContext('webgl2'))
        } catch (e) {
            return false
        }
    }

    static getWebGLErrorMessage() {
        return this.getErrorMessage(1)
    }

    static getWebGL2ErrorMessage() {
        return this.getErrorMessage(2)
    }

    static getErrorMessage(version) {
        const names = {
            1: 'WebGL',
            2: 'WebGL 2'
        }

        const contexts = {
            1: window.WebGLRenderingContext,
            2: window.WebGL2RenderingContext
        }

        let message = 'Your $0 does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">$1</a>'

        const element = document.createElement('div')
        element.id = 'webglmessage'
        element.style.fontFamily = 'monospace'
        element.style.fontSize = '13px'
        element.style.fontWeight = 'normal'
        element.style.textAlign = 'center'
        element.style.background = '#fff'
        element.style.color = '#000'
        element.style.padding = '1.5em'
        element.style.width = '400px'
        element.style.margin = '5em auto 0'

        if (contexts[version]) {
            message = message.replace('$0', 'graphics card')
        } else {
            message = message.replace('$0', 'browser')
        }

        message = message.replace('$1', names[version])

        element.innerHTML = message

        return element
    }
}

export { WEBGL }