method flush

Source

void flush() {
  if (renderBufferIndex.position > 0 && renderBufferVertex.position > 0) {
    int count = renderBufferIndex.position;
    renderBufferIndex.update();
    renderBufferIndex.position = 0;
    renderBufferIndex.count = 0;
    renderBufferVertex.update();
    renderBufferVertex.position = 0;
    renderBufferVertex.count = 0;
    renderingContext.drawElements(gl.TRIANGLES, count, gl.UNSIGNED_SHORT, 0);
    renderStatistics.drawCount += 1;
  }
}