Also known as, wee backend for ShaderToy.

Also known as, GLSL implementation of an interpreter or VM for https://github.com/nathanfarlow/wee

Running at https://www.shadertoy.com/view/mdtcW4

• Most wee instructions (mov, swap, add, sub, store, setlt, jmpz)
• MMIO (mouse, keyboard, display)

• Some nonessential wee instructions (getc, putc, exit)

Who needs those instructions anyway? It turns out that the "truly minimal instruction set" can be pruned of this ISA bloat and still be very functional.

• MMIO-based ALU
• Documentation! (standardized MMIO framework)

• The VM is available at https://www.shadertoy.com/view/mdtcW4, with a sample program.
• To run the interpreter on a different program, pipe the wee code to python3 encode.py, and put the output into the "Buffer A" tab. Then, just click the Compile (▶) button and the Reset (⏮) button.
• For example, I used m4 prog.wee.m4 | python3 encode.py | xclip -sel c -i to evaluate the macros, convert from wee to glsl, and copy to clipboard so I can paste on the website.