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glReadPixels

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My window is 256x256; I draw a full red quad covering the screen. My code: float data[256]; glReadPixels(0,0, 1, 256, GL_RED, GL_FLOAT, &data); I output the data and the last 20 or so pixels that it reads aren't "1" but stuff like: 5.94044e-039 5.88879e-039 Any idea what I did wrong?

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When I call the CreateWindow function (or whichever one it is) I told windows to give me 256x256, does it count the top of the window (blue part) as part of the window? Cuz that would make sense then since its about 20 pixels.

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