In short:
wglSwapIntervalEXT(0) - disables vsync, OK
wglSwapIntervalEXT(1) - adaptive vsync, NOT OK !
wglSwapIntervalEXT(-1) - adaptive vsync, OK
wglSwapIntervalEXT(-2) - adaptive vsync half rate, OK
затем число 0b001 (-l/2,-l/2,+l/2)
затем число 0b010 (-l/2,+l/2,-l/2)
затем число 0b011 (-l/2,+l/2,+l/2)