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I am trying to detect whether a particular pixel is filled or not in OpenGL in order to implement the flood fill algorithm. So, I searched and found the glreadpixel function but I don’t get how I can use this function and whether or not it can solve my problem.
The proper way is probably not to read back pixels. Instead, you should do all manipulations in a bitmap that you manage on your own. Then you request OpenGL to show this bitmap.