Implementing custom texture filtering

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I would like to implement alternate texture filters (e.g. 2xSAI, Hq2x, etc). I am at a loss for where I would start with this or if it is even possible without lower level access to the rendering engine in Unity. Does anyone know how one might attempt to accomplish this?

1 Answer

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here are most of the original scaling and interpolation shaders including 2xSAI, shouldnt be to hard to convert one of them into a fragment shader that you can apply to a material in unity.

http://www.si-gamer.net/gulikoza/dosbox.html

i have done somthing similar with my own implementation of SAI in webGL