_f_a_c_t_o_r specifies a scale factor which is used to create a variable
offset for each polygon.
_b_i_a_s specifies a constant which is added to each polygon's
_z offset.
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
When GGGGLLLL____PPPPOOOOLLLLYYYYGGGGOOOONNNN____OOOOFFFFFFFFSSSSEEEETTTT____EEEEXXXXTTTT is enabled, each fragment's _z value will be
offset after it is interpolated from the _z values of the appropriate
vertices. The value of the offset is _f_a_c_t_o_r * DZ + _b_i_a_s, where DZ is a
measurement of the change in _z relative to the screen area of the
polygon. The offset is added before the Depth Test is performed and
before the value is written into the Depth Buffer.
Initially GGGGLLLL____PPPPOOOOLLLLYYYYGGGGOOOONNNN____OOOOFFFFFFFFSSSSEEEETTTT____FFFFAAAACCCCTTTTOOOORRRR____EEEEXXXXTTTT and GGGGLLLL____PPPPOOOOLLLLYYYYGGGGOOOONNNN____OOOOFFFFFFFFSSSSEEEETTTT____BBBBIIIIAAAASSSS____EEEEXXXXTTTT
are both set to 0.0.
This is useful for rendering hidden line images, for applying decals to
surfaces, and for rendering solids with highlighted edges.
NNNNOOOOTTTTEEEESSSS
ggggllllPPPPoooollllyyyyggggoooonnnnOOOOffffffffsssseeeettttEEEEXXXXTTTT is part of the EEEEXXXXTTTT____ppppoooollllyyyyggggoooonnnn____ooooffffffffsssseeeetttt extension, not part
of the core GL command set. If GGGGLLLL____EEEEXXXXTTTT____ppppoooollllyyyyggggoooonnnn____ooooffffffffsssseeeetttt is included in the
string returned by ggggllllGGGGeeeettttSSSSttttrrrriiiinnnngggg, when called with argument GGGGLLLL____EEEEXXXXTTTTEEEENNNNSSSSIIIIOOOONNNNSSSS,
extension EEEEXXXXTTTT____ppppoooollllyyyyggggoooonnnn____ooooffffffffsssseeeetttt is supported by the connection.
EEEERRRRRRRROOOORRRRSSSS
GGGGLLLL____IIIINNNNVVVVAAAALLLLIIIIDDDD____OOOOPPPPEEEERRRRAAAATTTTIIIIOOOONNNN is generated if ggggllllPPPPoooollllyyyyggggoooonnnnOOOOffffffffsssseeeettttEEEEXXXXTTTT is executed
between the execution of ggggllllBBBBeeeeggggiiiinnnn and the corresponding execution of
