LightTest code is done for now. Test it here (needs DX9, PixelShader 1.2, VertexShader 1.1, 4 TextureStages, A8R8G8B8 Texture-RenderTarget. It works on my Geforce4, should work on a 3 as well. Probably Newer ATI-cards, too). Features:

• 4 textures w/ 4 combiner-stages (i.e. should run at a minimum of 50% max fillrate)
• lighting performance independent of # vertices of object
• attenuation from light -> object and object -> viewer (no fog needed, ambient retained)
• ambient is done with filtered HDR cubemap (i.e. depends on normal!)
• different attenuation for diffuse and specular light (from object -> viewer)
• directional and point-lights
• decal texture + glossmap
• per pixel diffuse + specular [attenuated for point-lights] (limited to about 6 point lights + 7 directional lights = ~13 per pixel lights!)
• specular power is not fixed in pixel shader
• accurate reflection vector calculation, no halfway vector cheating
• approximates elliptical objects (for point light attenuation)
• specular color is always the same as the diffuse color of a light

Comments? Queries?