Per-vertex colors are broken

[rickgaiser]

There are 3 VU1 renderers that should be able to handle per-vertex colors.
See vu1/general_pv_diff*.vcl

I think they work under specific conditions only:

• color material needed?
• lighting needed?

A good example to test the per-vertex colors is the "examples/nehe/lesson03", that should show a triangle with 3 different colors per vertex:

The left is how it should look (pc rendered), the right is how it looks currently (pcsx2 rendered).

Another related issue:
If enabling glEnable(GL_COLOR_MATERIAL); in the above example, ps2gl will mismatch the used vu1 renderer and the data sent to that renderer, causing a corrupted image to show. Probably caused by an unsupported feature that is not handled correctly.

Also broke becouse of the same issue:

• examples/nehe/lesson04
• examples/nehe/lesson05

[DC925928496]

I'd like to work on this issue. I'll look at the VU1 renderers in vu1/general_pv_diff*.vcl and the examples/nehe/lesson03 to understand how per-vertex colors should work and fix the broken behavior.