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Custom AA shader

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If I am performing a render technique that does not allow multi sampling on the users hardware (HDR, something involving FBO's) I was thinking of offering a fall-back to custom AA option. On possibility is to use a shader like this: (section 9.5 Antialiasing) here it mentions using an 'edge detect' phase to selectively blur possible aliased edges. but how Would I implement a 'Selective' Gaussian filter? Is this the best method? I've heard other people talk about custom AA filters, how could I do this? cheers

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