how to create custom cifilter using metal

To create a custom CIFilter using Metal, you can follow these general steps:

Set Up Your Metal Environment: Ensure you have a Metal environment set up in your project. This includes creating a Metal device, command queue, and other necessary components.
Create a Custom Metal Shader: Write your custom shader in the Metal Shading Language (MSL). This shader will define how each pixel is processed.
Integrate with Core Image: Use the CIKernel class to create a custom kernel from your Metal shader. You can then create a CIFilter subclass that uses this kernel.
Apply the Filter: Use your custom CIFilter in your image processing pipeline.

For a practical example of how to use Metal shaders within SwiftUI, you can refer to the session Create custom visual effects with SwiftUI (20:10). This session demonstrates how to instantiate a shader in SwiftUI, pass parameters, and apply the effect to a view.

For more detailed information on displaying images using Core Image and Metal, you can refer to the session Use HDR for dynamic image experiences in your app (26:48). This session covers setting up an MTK view for extended range content, applying filters, and rendering the resulting image.

Relevant Sessions:

If you need more specific details or code examples, please let me know!