Implement bilateral filter by SkRuntimeEffect？

[Jerry Zhuang]

Hi guys，

I'm new to skia，and I'm curious about can I implement bilateral filter by using SkRuntimeEffect？

Thanks

[Dave M]

i have same question

[Brian Osman]

Certainly. I grabbed the source code for a color-weighted bilateral filter from https://www.shadertoy.com/view/4dfGDH, then tweaked it very slightly to adjust to SkSL's syntax: https://shaders.skia.org/?id=87f4222b2d153782ed322e4058a67ee00a7f442fceb753169090a4fb6b3e7c10

That has the same behavior as the shadertoy version - you can click and drag the mouse to "wipe" the effect on or off. Note that this particular shader is fairly expensive - the original shadertoy has links to a version with the kernel pre-computed, which is much faster. In any case - it's doing 226 texture samples, so it's always going to be somewhat slow. Additionally, when I tested it locally with the CPU backend, it crashes. I haven't been able to debug that yet - but I'm sure we're hitting some limit while JIT'ing the shader (given the size of the program).

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