Using Metal Shading Language for Custom CIKernels - Metal & Swift
While there are plenty of built-in Core Image filters (CIFilter) provided by Apple, one may want to touch each pixel of still images or video images on his/her own. That's why we have Metal Shading Language to implement our custom CIKernels and subsequently CIFilters of our own.
Metal Shading Language Extensions
Core Image provides a set of language extensions to MSL in CIKernelMetalLib.h. These extensions include three new data types for working with images: sampler (for accessing the input image), sample_t (represents a single color sample from the input image), and destination (for accessing the output image). The extensions also include convenience functions such as color conversion and premultiply / unpremultiply. Whereas in CIKL, you typically called global functions when working with, for example, coordinates and samples, these functions are implemented as member functions on the new types. The following table shows a summary of CIKL global functions and their equivalent MSL functions.
- CIColorKernel is specialized kernels for processing single samples (i.e. pixels), not whole samplers (i.e. textures).
Filters and Utilities for Core Image. Contribute to YuAo/Vivid development by creating an account on GitHub.
Metal series of tutorials (2) - Metal implementation of LUT filters
Simple filter In our usual image processing process, the longest thing to do is to change the overall image of a certain color. Let's take an example. If we change the R value of all RGB to 0.5 times the original value, according to the previous wiki, the process of drawing a graph is vertex anUTF-8...