This is what I have done so far to convert the R200 driver to use t_vertex. It is only a conversion for SW TCL, and it's not quite complete. I've managed to clean up all the crashes that I could find, but I've only tested with gears, geartrain, and tunnel. There are some known problems:
- The textures in tunnel are not quite right. They're sort of zig-zaggy.
- The colors of two of the gears in gears are swapped. The red gear is blue and the blue gear is red. The green gear is correct.
I chopped out all of the _r200_render_stage stuff from r200_swtcl.c. It is unused (due to bad interactions with UT2k3), and was only confusing me. When this patch gets committed, that code can go back in, I think.
There are two hacks that I had to do to get things working. Neither of these needed to be done by the i830 or savage drivers. First, I had to add a "viewport" matrix that remains an identity matrix. This is because the Radeon chips do the viewport transform in hardware. tnl_dd/t_dd_vbtmp.h had the ability to handle hardware like this, but t_vertex apparently does not. Second, I had to force TNL to always produce project coordinates. Again, the Radeon hardware can do the final projection in hardware almost all the time, but due to the way the i830 and savage drivers use use tnl->vb.NdcPtr (actually VB->NdcPtr) I couldn't see a way around this. I may just be missing something there.
Ah, ok. I see the problem. Basically this has to do with the fact that choosing the hw vertex format has gone from being something (normally) done ahead of time, prior to actually running the tnl pipeline, to something done after that, and based on its results. The only problem is that by this time, the pipeline has run, and it's too late to decide whether or not to calculate projected coordinates. Oh well, it's not too hard to do that ahead of time.
Keith
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