[AD] better pixelshader

[tom st denis <tomstdenis@xxxxxxxxxx>]

I hope this is helpful.

I modified my pixelshader routine to use the hardware-independant RGB
format.  It uses the same RGB format the polygon3d routines use.  Here
is the code

unsigned long pixelshade(unsigned long col, unsigned long level)
{
    return
        (((col&255)*level)>>8)|
        ((((col>>8)&255)*level)&0xFF00)|
        (((((col>>16)&255)*level)&0xFF00)<<8);
}



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