🚀 go-pugleaf

Hi,

I'm currently using OpenGL for rasterization only, doing my
own transformations, lighting & clipping calculations. Now
to my question: is it possible to set up OpenGL to compute
the resulting frame buffer color using this formula:

color = texture RGB * iterated RGB + iterated Alpha
(using iterated Alpha as monochrome specular component)

I've done this already with Glide, and AFAIK it's also possible
with Direct3D, but is it possible _without_ using OpenGL's
internal lighting pipeline?

I think I could "emulate" this equation using alpha blending
and multi-pass rendering, but this would cost performance.




Thanks,
Daniel