Function sandbox is a program which displays a very large number of "grains of sand", where each one is pushed around by some "wind", with the velocity of the wind at each point being determined by a function of the point's coordinates. It does all its computations on your GPU!
You can go to https://pommicket.itch.io/function-sandbox to get executables for Windows/Linux.
On Linux you might need to install SDL2 (there's a very good chance you already have it installed). On Debian/Ubuntu,
you can do this with sudo apt install 'libsdl2-2*'.
Use W/A/S/D/Q/E or arrow keys/page up/page down to move.
You can check out the pre-installed sandboxes. Keep in mind that some of them use a very large number
of grains, so if your GPU isn't very good, it might not be able to handle some of them.
If you want to make your own sandboxes, check out sandboxes/EXAMPLE.txt for a well-documented
example.
I really recommend to just play around with functions and see what you get.
All the pre-installed sandboxes were just made with trial and error.
On Linux, install SDL2 with
sudo apt install libsdl2-dev
or equivalent, then run make release.
On Windows, download Visual Studio, the VC development libraries for SDL2,
extract it, rename the folder to SDL2, and place it in the same folder
as the source code.
Then add vcvarsall.bat to your PATH, and run make.bat release.
Finally you'll need to copy SDL2\lib\x64\SDL2.dll to the same folder as
sandbox.exe.
Alternatively, you can just compile main.c with any C compiler, making sure that SDL.h is in your include path (and you're linking with SDL2).
You can report a bug to pommicket at pommicket.com
The code for function sandbox and all the example sandboxes are in the public domain.