I'll need to try this as an OpenGL (ES) shader in an app I work on regularly. I've been meaning to replace the default bilinear filtering with something a bit n

I'll need to try this as an OpenGL (ES) shader in an app I work on regularly. I've been meaning to replace the default bilinear filtering with something a bit nicer-looking for ages, and this seems like it fits the bill nicely, as it avoids the usual ringing and moiré issues. (I don't need to worry about perspective correction as the app is 2D only)