add GSoC'23 wrapup post for Justin Wong

contributor_docs/project_wrapups/README.md

@@ -8,6 +8,7 @@ This folder contains wrap-up reports from p5.js related [Google Summer of Code](
 ### Google Summer of Code 2023
 * [Mobile/Responsive Design Implementation of p5.js Web Editor](https://github.com/processing/p5.js/blob/main/contributor_docs/project_wrapups/dewansDT_gsoc_2023.md) by Dewansh Thakur, 2023
 * [Friendly Error System(FES) and Documentation](https://github.com/processing/p5.js/blob/main/contributor_docs/project_wrapups/ayush23dash_gsoc_2023.md) by Ayush Shankar, 2023
+* [Supporting shader-based filters in p5js](https://github.com/processing/p5.js/blob/main/contributor_docs/project_wrapups/wong_gsoc_2023.md) by Justin Wong, 2023
 
 ### Google Summer of Code 2022
 * [p5 /teach reorganize & update](https://github.com/processing/p5.js/blob/main/contributor_docs/project_wrapups/graciazhang_gsoc_2022.md) by Gracia Zhang, 2022

contributor_docs/project_wrapups/wong_gsoc_2023.md

@@ -0,0 +1,46 @@
+# Supporting shader-based filters in p5js
+
+By [Justin Wong](https://wonger.dev)
+
+| Faster image filters | Less boilerplate for shader code |
+|-|-|
+| <video src="https://github.com/wong-justin/p5.js/assets/28441593/41edb6b9-ef4c-4b2e-8b22-2237da4617d9">filter(), before and after</video> | ![2D shader setup, before and after](https://github.com/wong-justin/p5.js/assets/28441593/6bbd1627-3a01-4911-8c5c-992d63538b96) |
+| [old filter() sketch](https://editor.p5js.org/jwong/sketches/oG9AOomYm) | [old 2D shader sketch](https://editor.p5js.org/jwong/sketches/ehXcWtycm) |
+| [new filter() sketch](https://editor.p5js.org/jwong/sketches/nWmTF8UED) | [new 2D shader sketch](https://editor.p5js.org/jwong/sketches/T96caQxWq) |
+
+My work centered around the `filter()` function because it was too slow.
+I made it faster by using shaders, which are programs that use the GPU for image processing. 
+Now people can use effects like blur without noticing such a drop in performance.
+
+There were some secondary accomplishments as well.
+There's a new function `createFilterShader()` that makes writing shaders easier.
+I helped revise a few documentation pages.
+I also tried to contribute some benchmarking tools, but that was a bit ambitious.
+All of these changes make shaders and image filters more accessible. 
+
+I enjoyed the experience and learned a lot.
+In fact, I learned so much that I wrote [another post](https://wonger.dev/posts/gsoc.html) on my website.
+That post is more about the GSoC experience in general, especially aimed at newcomers, and not so much about p5js details.
+
+Many thanks to my mentors for all their support: Adam Ferriss, Austin Slominski, and So Sun Park. Thanks also to other maintainers like Dave Pagurek, Kenneth Lim, and Qianqian Ye for helping along the way.
+
+## Work Completed
+
+- [Initial pull request](https://github.com/processing/p5.js/pull/6167), just some documentation. Status: merged
+- [Second pull request](https://github.com/processing/p5.js/pull/6237), mostly internal changes to enable new shaders. Status: merged
+- [Third pull request](https://github.com/processing/p5.js/pull/6324), replacing the old filters with new shader filters. Status: merged
+
+### Public documentation pages:
+- [WEBGL](https://p5js.org/reference/#/p5/WEBGL) -  Status: merged, page created
+- [filter()](https://p5js.org/reference/#/p5/filter) - Status: merged, page not updated yet
+- [createFilterShader()](https://p5js.org/reference/#/p5/createFilterShader) - Status: merged, page not created yet
+
+### Performance measuring helpers:
+
+- [JSPerf benchmarks](https://jsperf.app/sideci) for comparing two different p5js builds. Status: flopped. It was difficult to set up the tests inside the sketch, and results were inconclusive
+
+## Potential improvements:
+
+1. I think there should be some refactoring to cut down on all the graphics layers swimming around - maybe by using framebuffers, or maybe just by understanding and wrangling the canvases better. 
+2. There's some alternative blur filters worth investigating. There's an issue opened now to try for a better quality gaussian blur shader that still adjusts according to user input.
+3. Performance could still be improved. Filters in WEBGL mode work well, getting 60 fps on my machine. But transferring filtered content to a default P2D renderer from a hidden WEBGL renderer results in about 20 fps. It also seems like performance suffers on mobile GPUs.