How to use

getContext

function

in

gl

initContext() {
  return getContext(2, 2, {
   preserveDrawingBuffer: true
  });
 }

static setupFeatureChecks() {
  testCanvas = null;
  testExtensions = null;
  if (typeof getContext !== 'function') return;
  try { // just in case, edge cases
   testContext = getContext(2, 2, {
    preserveDrawingBuffer: true
   });
   if (!testContext || !testContext.getExtension) return;
   testExtensions = {
    STACKGL_resize_drawingbuffer: testContext.getExtension('STACKGL_resize_drawingbuffer'),
    STACKGL_destroy_context: testContext.getExtension('STACKGL_destroy_context'),
    OES_texture_float: testContext.getExtension('OES_texture_float'),
    OES_texture_float_linear: testContext.getExtension('OES_texture_float_linear'),
    OES_element_index_uint: testContext.getExtension('OES_element_index_uint'),
    WEBGL_draw_buffers: testContext.getExtension('WEBGL_draw_buffers'),
    WEBGL_color_buffer_float: testContext.getExtension('WEBGL_color_buffer_float'),
   };
   features = this.getFeatures();
  } catch (e) {
   console.warn(e);
  }
 }