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Textures larger than 256x256

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Is there anything special I have to do to have textures bigger than 256x256? And also is there a way that I can detect whether or not the users card supports textures above 256x256? For instance, is here a way that I can do something like NeHe did in lesson #25 do detect it?

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you can get the max texture size with:
glGetIntegerv(GL_MAX_TEXTURE_SIZE, int *var);
i think this shloul work. this function returns the max size of your gl implementation.

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