teodorszeltins/swiftui-metal-blur

A demo SwiftUI app using Metal shaders to apply a custom blur filters.

Blur filters:

• Gaussian Blur – yields a more natural, soft-edged result, but slow.
• Box Blur – damn fast, but can produces a harsher effect for larger radius.

Preview

TODO

• Use different edge sampling for Gaussian blur. Right now, edges are "clamped", which is better than nothing, but they still show some artifacts. I should switch to skipping out-of-bounds values or “bouncing” at the edges for a better looking blur.
• Improve performance for Gaussian blur. Using a 1D (separable) algorithm instead of a 2D convolution would be the way to go.

Why?

I just wanted to play around with blur algorithms and see how difficult they are.

Credit

• Photo by Wes Tindel on Unsplash