#34 Employ plane equations for rasterization

[Hans-Martin Will]

What I mean is for the parameter interpolation
>part (equation 6 and 7). For example, for red color, it
is interpolated
>along the three edges fist (3 divisions by 3 different
dy), and then
>interpolated across the horizontal span (1 division per
scanline). For
>plane equation implementation, only 1 division (notice
the denominators are
>just negative of each other, no need to divide again)...