Making progress orienting the OpenGL virtual camera, and fixed the rotation of the image so it's [very nearly] square to the virtual camera. Note to self: degrees are not the same as radians.
In theory, all I need to do is make some fine adjustments to the image orientation to compensate for the pan and tilt of the real camera (when the picture was actually taken). And then get it to scale properly- the image should take up the whole gray area. And hopefully the perspective will correct itself with the scaling... hopefully being the key word.
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