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Well, you really need a 3D accelerator for D3D alpha blending. I tried turning acceleration off on mine, and it ran at about 4 fps on my P3 450. That was with a textured and blended polygon though, it was more like 6 or 7 without the texture, but it''d probably be a lot slower with an actual game running behind it, so you might wanna try checking if the user has a 3D card before using it, and if not, write an asm routine to darken and lighten each pixel of the surface one at a time.
I think I had this discussion before (Was it you Deku?
)The more features you add to your game -> The more specs your computers needs -> Your target audience decreases.
Of course you can always make replacement code in asm...
