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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to explain the situation. Im getting some source image at a 320 x 480 resolution and apply the sobel filter for now. But the result in my mtk view is a tiny rectangle at the top right because of this resolution and so I want to resize the texture before applying the sober filter.
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.
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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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