BitonicPixelSorter

GPU-accelerated pixel sorter with bitonic sorting for Unity.

Live Demo (WebGPU port)

The screenshot below shows it running on an NVIDIA GeForce RTX 4070 and it keeps over 1000 FPS at FHD resolution.

Installation

Use UPM git dependencies.

1. Open Package Manager and click + > Add package from git URL...

2. Enter https://github.com/ruccho/BitonicPixelSorter.git?path=/Packages/com.ruccho.bitonicpixelsorter#release

3. (Optional) To use a RendererFeature for UniversalRP, also install https://github.com/ruccho/BitonicPixelSorter.git?path=/Packages/com.ruccho.bitonicpixelsorter.urp#release

BitonicPixelSorter Component

Property	Type	Description
Use As Image Effect	bool	It works as an image effect when attached to the camera. This is only active when you are using builtin render pipeline.
Shader	ComputeShader	Set BoitonicPixelSorter.compute.
Direction	bool	Switches sorting direction between horizontal / vertical.
Ascending	bool	Switches ordering.
Threshold Min	float	Lower threshold of the brightness.
Threshold Max	float	Upper threshold of the brightness.

Use from code

var sorter = GetComponent<BitonicPixelSorter>();

//BitonicPixelSorter.Execute(Texture src, RenderTexture dst)
sorter.Execute(sourceTexture, destinationTexture);

Use RendererFeature for UniversalRP

In your renderer asset, add Bitonic Pixel Sorting Feature to the renderer feature list.

References

https://github.com/hiroakioishi/UnityGPUBitonicSort

https://www.inf.hs-flensburg.de/lang/algorithmen/sortieren/bitonic/oddn.htm