Entropie

100% Vibecode – but tested.

The beginnings of a festival builder in C (SDL3 + OpenGL 3.3). You arrive at a farm with friends, set up camp and get the site ready, together with the people living there.

• Everything in detail, and what's still open: STATE.md
• How the code is built: ARCHITECTURE.md
• Rules for changing it: RULES.md

What's in it

• The site: Homburgshöhe at Geflügelhof Oderland, traced from the real

map (about 340 x 340 m): the farmyard, the house, your garages, the barn, forest, roads. Painted in the rotoscope style of Waking Life

• Berlin: the story starts at the kitchen table in Grossbeerenstrasse

37 (a festival - where, its name), then the Herberge bar with the whole crew (who leads which floor, the cash box). Every weekend on the ground ends Sunday at six: back to the Herberge (how far it got, open floors, what next weekend is for), Friday at five on the ground again

• Arriving: by car with Volkram, Jana and Toni. Say hello to Kurti and

his sons, unload the car, pitch the tents. A golden marker shows who or what's next; Kurti shows you all the way up to the camping meadow

• People: everyone has their own temperament, build, skills, walk and

habits. They eat, drink, smoke, pee, sleep, work, chat and say no

• The festival: the crew turns up over the first day. Four floors get

built step by step (clearing, frame from logs, deck, roof, paint) by their lead and helpers - or by you (hold left click at a stage). Talk to people about it (X, then 4): praise them, ask someone to lead, take a lead over. Fed up, people give up leading or helping

• Why questions: why do festivals hand out Urinellas, have an awareness

team, say "no shirt, no service"? See it happen, ask who knows, decide at the Herberge. Your notebook (J) keeps track

• The festival: the sixth weekend. 36 guests camp beyond the wood and

dance at every floor that got built, each with its own music. Saturday afternoon a storm: get everybody inside in time (X, then 1: shout it). Sunday they leave, and the crew sums it up at the fire

• The clean-up and home: the guests leave litter. Supporters work two

shifts for their free ticket. Monday everyone still keen picks up, Kurti has a look (clean, or a bill), then it's into Volkram's car and back to Berlin - the end

• Side jobs: mow the Kartoffelacker with the scythe, rescue the

protected vineyard snails before the regulatory office comes (or pay a fine), bring Kerry logs to carve into figures with the chainsaw

• The big old tree: Enrico from Go-Darmstadt fells it with the

chainsaw. You throw the rope up as high as you can, the others pull it away from the phone line. Not enough pull and it comes down on the line

• Injuries: a falling tree or a hard fall can twist an ankle or break

an arm or a leg. Landing, you bounce into the knees and roll if you're moving; too high and something gives. Broken: the ambulance comes, they're back days later with a cast, and slower

• People and touch: E / Q reaches out and holds on - a post, a thing, or

somebody. Where you hold them and how they feel about you decides how they take it: walk hand in hand, calm them, or get told off. Harassment gets noticed, and the more aware the place, the likelier someone steps in. Intimacy stays off screen

• Any tree can be felled - the protected ones and Kurti's apple trees

cost dearly

• Money and shopping: a cash box of 1200 EUR. Send Volkram to the

hardware store for boards, nails, screws, paint and food. The stages need that material; the crew fetches it from the store

• Moving: real steps, stepping over and onto things, jumping, climbing

(several ways up), ladders, stumbles and falls

• Work: fell trees, cut and split firewood, stack it, clean up, carry

heavy things together. Ask for help (G) or give someone a job (X)

• Campfire: build it, light it, grill on it, put it out, sit round it
• Water: hose, watering can, puddles and mud
• Weather: dry spells, clouds coming over, rain, thunderstorms, and wind

that blows tents, paper and pullovers away. Hoods go up, umbrellas get fetched; long rain turns the trodden paths to mud

• Drinks: crates of beer, water, soda and mate. Empties go back into

their crates; bottles in the wrong crate get sorted out

• Sound: steps on every ground, wind, rain, thunder, the fire, axe and

chainsaw, glass, voices, Alice barking, birds by day and crickets at night (all made up on the fly)

• Drink: too much and you sway, stumble, get sick or pass out
• Alice: the dachshund. She fetches, begs and loves being petted
• Saves: autosave, quick save and named saves. Old saves keep working

Controls

The game starts in third person. Heavy things need help: the strength of everyone holding adds up.

Build

Needs a C23 compiler (GCC 9+ or Clang 9+), make, pkg-config, SDL3, SDL3_ttf and OpenGL 3.3. On Debian (or any Linux with these packages):

sudo apt install build-essential pkg-config libsdl3-dev libsdl3-ttf-dev libgl-dev
make
./entropie

Install

sudo make install     # binary to /usr/bin, assets to /usr/share/entropie
sudo make uninstall   # removes both
make clean            # removes build output

Use PREFIX=/usr/local to install elsewhere. Saves live in ~/.local/share/entropie/entropie/saves.

Layout

assets/        shaders, font and its license
src/core/      window, GL loader, input
src/math/      vectors, matrices, view frustum
src/render/    renderer, ink pass, meshes, shapes, figures, camera, sky, UI
src/world/     world, objects, physics, terrain, water, site, scene, tools, ...
src/people/    bodies, hands, climbing, AI, talking, needs, the dog
src/game/      the frame, player actions, talking, saves
src/main.c     main loop and menus

Dependencies point downward: main → game → world/people → render → core/math.

Version

make version prints e.g. entropie 2.50.0 (build 6409893). The build id is an md5 of all sources and assets.