[Mesa3d-dev] writing line emulation for hw driver?

[<ran...@gm...>]

Hello all!

I recently plugged in old TNT2 (nv05) card and started to playing with it. 
This hardware can do quads and triangles, but not lines or points ....  So, i 
need to emulate them.

utah-glx has some code exactly for this generation of hardware:

http://utah-glx.cvs.sourceforge.net/viewvc/utah-glx/glx-xf3/servGL/hwglx/nv/riva_prim.c?revision=1.11&view=markup

I tried to  cook up something like this for current nouveau driver, but nearly 
failed.

Lack of hardware PolygonOffset support lead me into 
src/mesa/tnl_dd/t_dd_tritmp.h , used in many drivers. Currently, it can only 
DE-compose triangles, but can (or better - should) it be abjusted for 
creating additional vertex info (2->4, 1->4) ?

Should one still use this file in modern world? On non-hw-tcl capable hw .....