floodfill algorithm using openGL

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I need to paint a polygon using  floodfill algorithm.
The input values are any pixel positions inside the polygon and fill color.
The algorithm works as follows:
First it has to get the color of the given pixel.Then comapare the color
with the fillcolor.
?If not  paint with new color in a 4-connected manner.

I need help to find out the corresponding function to get the color of
specified pixels.
In Turbo C we use getPixel().
Using openGL in linux which is the function to be used...
Can anyone help me out.
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