[Bug 31260] Tomb Raider 4 Broken Lighting

https://bugs.winehq.org/show_bug.cgi?id=31260

--- Comment #22 from Henri Verbeet  ---
(In reply to Matteo Bruni from comment #21)
> It seems more likely that this bug has to do with:
>
> err:d3d:process_vertices_strided No diffuse color in source, but destination
> has one
> err:d3d:process_vertices_strided No specular color in source, but
> destination has one
>
> i.e. lighting is unimplemented in process_vertices_strided().

For what it's worth, if someone wanted to have a go at that, the GLSL
implementation (shader_glsl_ffp_vertex_lighting() in particular) may be a
useful reference.