_d_e_p_t_h Specifies the depth value used when the depth buffer is cleared.
The initial value is 1.
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
ggggllllCCCClllleeeeaaaarrrrDDDDeeeepppptttthhhh specifies the depth value used by ggggllllCCCClllleeeeaaaarrrr to clear the depth
buffer. Values specified by ggggllllCCCClllleeeeaaaarrrrDDDDeeeepppptttthhhh are clamped to the range
[0, 1].
EEEERRRRRRRROOOORRRRSSSS
GGGGLLLL____IIIINNNNVVVVAAAALLLLIIIIDDDD____OOOOPPPPEEEERRRRAAAATTTTIIIIOOOONNNN is generated if ggggllllCCCClllleeeeaaaarrrrDDDDeeeepppptttthhhh is executed between the
execution of ggggllllBBBBeeeeggggiiiinnnn and the corresponding execution of ggggllllEEEEnnnndddd.