Re: [Algorithms] S/W Clipping - Perspective Correct Vertex Colors

[Ville M. <wi...@hy...>]

Simon, you're absolutely correct.. but I believe that Brian said in his 
original post that on this particular piece of hardware, the color 
values are affinely interpolated.

cheers,
-wili

Simon Fenney wrote:

>Ville Miettinen [mailto:wi...@hy...] wrote:
>  
>
>>Hi Brian,
>>
>>The problem you are facing comes 
>>from the fact that your output is perspective correct, but 
>>you'd want to 
>>"decorrect" some of your attributes, i.e., color values, because they 
>>are linearly interpolated in your graphics hardware.
>>    
>>
>
>I don't think you can assume that the colours are only linearly interpolated
>in graphics hardware. I would think that most of today's systems would use
>the same interpolation hardware for all shading parameters (i.e colour and
>texture coordinates) and hence are possibly perspective correct.
>
>regards
>Simon
>
>
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-- 
Ville Miettinen, CTO
Hybrid Graphics, Ltd.
http://www.hybrid.fi