itowns/lib/ThreeExtended/capabilities/WebGL.js

A JS/WebGL framework for 3D geospatial data visualization

class WebGL {
  static isWebGL2Available() {
    try {
      const canvas = document.createElement('canvas');
      return !!(window.WebGL2RenderingContext && canvas.getContext('webgl2'));
    } catch (e) {
      return false;
    }
  }
  static isColorSpaceAvailable(colorSpace) {
    try {
      const canvas = document.createElement('canvas');
      const ctx = window.WebGL2RenderingContext && canvas.getContext('webgl2');
      ctx.drawingBufferColorSpace = colorSpace;
      return ctx.drawingBufferColorSpace === colorSpace; // deepscan-disable-line SAME_OPERAND_VALUE
    } catch (e) {
      return false;
    }
  }
  static getWebGL2ErrorMessage() {
    return this.getErrorMessage(2);
  }
  static getErrorMessage(version) {
    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', {
      1: 'WebGL',
      2: 'WebGL 2'
    }[version]);
    element.innerHTML = message;
    return element;
  }

  // @deprecated, r168

  static isWebGLAvailable() {
    console.warn('isWebGLAvailable() has been deprecated and will be removed in r178. Use isWebGL2Available() instead.');
    try {
      const canvas = document.createElement('canvas');
      return !!(window.WebGLRenderingContext && (canvas.getContext('webgl') || canvas.getContext('experimental-webgl')));
    } catch (e) {
      return false;
    }
  }
  static getWebGLErrorMessage() {
    console.warn('getWebGLErrorMessage() has been deprecated and will be removed in r178. Use getWebGL2ErrorMessage() instead.');
    return this.getErrorMessage(1);
  }
}
export default WebGL;