init method
      
void
init()
      
     
    
    
Implementation
void init() {
  getExtension( 'EXT_color_buffer_float' );
  getExtension( 'WEBGL_clip_cull_distance' );
  getExtension( 'OES_texture_float_linear' );
  getExtension( 'EXT_color_buffer_half_float' );
  getExtension( 'WEBGL_multisampled_render_to_texture' );
  getExtension( 'WEBGL_render_shared_exponent' );
}