I'm using a screen with 60Hz refresh rate. And I call present(0,0) once per 33ms. The tearing still occur. Why? How does a screen to show a picture? Does it scan the window last for 16.6ms or may be just in 2ms?
I'm using windows fullscreen exclusive mode. And I believe that I can control the display so if I send frames with a steady interval, tearing are not expected to occur. However, the pictures are always tearing.