Re: d3d9/tests: Test NVDB (depth bounds test) behavior

[Henri Verbeet]

This is fine, except for the 8 space indentation. I wonder though if
perhaps it would be more interesting to start with a quad with a depth
gradient from 0.0 to 1.0, bottom to top, then set the min/max depth
bounds, and draw another fullscreen quad. That way you could easily
verify the cutoffs are in roughly the right spots.