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go - Get a pixel array from from golang image.Image

I need to get a pixel array in the form of []byte to be passed to the texImage2D method of a Contex from the /mobile/gl package.

It needs a pixel array where rgba values of each pixel is appended in the order of pixels left to right, top to bottom. Currently I have an image loaded from a file.

a, err := asset.Open("key.jpeg")
if err != nil {
    log.Fatal(err)
}
defer a.Close()

img, _, err := image.Decode(a)
if err != nil {
    log.Fatal(err)
}

I am looking for something like img.Pixels()

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