Hey @warrenm, I was playing around with MPS from your tutorial http://metalbyexample.com/metal-performance-shaders-in-swift/ … now I want to try and chain some filters, Sobel and Resize for example but I'm not sure where to start. Any tips?
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Oh, you want to upsample from the source first? In that case, MPSImageScale up to the desired size (yes, you have to compute the dest size manually); at worst use Lanczos (you probably don’t need it); then feed that to your Sobel.
Sorry if this is obtuse; I really should write a new article about all of this 
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Ah I didn't even know sobel is only applied to 1:1 aspect images, I'm using it on something 320 x 240. But yes that's exactly what I'm trying to do. So the thing to do is have one intermediate texture of the same size as my drawable?
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So I can encode the resize with the image as source and intermediate texture as destination, and the sobel filter with the intermediate as source and drawable as destination. Is that correct?
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Bingo, yes. Just make sure the drawable is coming from a layer/view whose framebufferOnly property is set to false.
End of conversation
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