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only showing part of a texture?

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I am trying do something similar to do a lighting effect similar to this:


Unfortunately, that is in flash and I would like to do it using either SDL or openGL. I am running into a bit of a snag of how something like that would be accomplished.

I was thinking that I would have my bottom texture for the board, then a full black shape covering it, then put a polygon with an alpha on 0 on top of that for the 'lighting'. However, after searching for quite some time, I have come up with nothing.

Would anyone be able to help point me in the right direction?

Thank you in advance!

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