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FBO support and free texture size

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Hi, In old graphics cards texture sizes had to be a power of 2. Also FBO didn't exist yet. Is it a relatively precise assumption that I do if I assume that the free texture sizes are not supported if FBO is not supported? or, is there a function which tells me if the graphic card supports free texture sizes (not constrained to be a power of 2)? Right now I can check for FBO and if not present, then I also constain texture sizes to be a power of 2.

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