Companion

The depth test always passes.

The depth test passes if the incoming depth is equal to the stored depth.

The depth test passes if the incoming depth is greater than the stored depth.

The depth test passes if the incoming depth is greater than or equal to the stored depth.

The depth test passes if the incoming depth is less than the stored depth.

The depth test passes if the incoming depth is less than or equal to the stored depth.

The depth test never passes.

The depth test passes if the incoming depth is not equal to the stored depth.