Add RuntimeShader Support.

[kkwpsv]

Description of Change

Add RuntimeShader support. See https://github.com/mono/SkiaSharp/issues/3137.

Bugs Fixed

None.

API Changes

Added:

• SKImageFilter SKImageFilter.CreateRuntimeShader(SKRuntimeShaderBuilder builder, string childShaderName, SKImageFilter? input)
• SKImageFilter SKImageFilter.CreateRuntimeShader (SKRuntimeShaderBuilder builder, float maxSampleRadius, string childShaderName, SKImageFilter? input)
• SKImageFilter SKImageFilter.CreateRuntimeShader (SKRuntimeShaderBuilder builder, float maxSampleRadius, string[] childShaderNames, SKImageFilter?[] inputs)
• SKRuntimeEffectUniforms (SKRuntimeEffectUniforms effectUniforms)
• SKRuntimeEffectChildren (SKRuntimeEffectChildren effectChildren)
• SKRuntimeEffectBuilder (SKRuntimeEffectBuilder builder)
• SKRuntimeShaderBuilder (SKRuntimeShaderBuilder builder)

Behavioral Changes

None.

Required skia PR

https://github.com/mono/skia/pull/145

PR Checklist

• [ ] Has tests (if omitted, state reason in description)
• [ ] Rebased on top of main at time of PR
• [ ] Merged related skia PRs
• [ ] Changes adhere to coding standard
• [ ] Updated documentation

[kkwpsv]

@dotnet-policy-service agree

[kkwpsv]

Here is a demo. https://github.com/kkwpsv/AvaloniaSkiaRuntimeShaderDemo

[kkwpsv]

I wonder if instead of putting the code in SKImageFilter, we rather add a SKRuntimeImageFilterBuilder and in fact mirror most of what we do for SKShader but instead of using the word shader like in C++ we use the word ImageFilter. I would even go so far as to add a CreateImageFilter method that just calls into CreateShader. And then also make a BuildImageFilter that then calls that - which would mean it really is just a shader. The Build() method on this would then call the image filter code in the C API and return a new SKImageFilter

I think there is no problem with your idea. What I am doing now is just to make the API close to C++.

[mattleibow]

@kkwpsv are you able to make the changes?

[taublast]

Need any help? This all sounds very exciting!

[OptimusPi]

Any updates? I tried the example repo, curious if it could handle the Balatro background effect shader.

https://github.com/kkwpsv/AvaloniaSkiaRuntimeShaderDemo/pull/1

Works super well :)