* Helper function to perform a 1px math calculation in order to determine WebGL capabilities. * From https://webglfundamentals.org/ * @private

* Call tick() from your render loop to measure the FPS of your application. * Internally, this does some low pass filtering to give consistent resul

* Used internally, see GPULayer.clone() for public API. * @private

* Get (and cache) positions buffer for rendering lines on boundary. * @private

* Get fragment shader for GPUProgram, compile new one if needed. * Used internally. * @private

* Set internal fragment shader uniforms for GPUProgram. * @private

* Set output for draw command. * @private

* Test whether the current buffer index has override enabled. * @private