ludic/examples
Orkuncakilkaya 5df0747642 feat(cli): 0.R5 - ludic deps says what a function can come to change (widest_write_reach, --wreach N); a port member and a registry field reach only themselves
A reach through Port.member() follows that member's binding (or its default), and Registry[i].field -
or a local holding Registry[i] - follows that field in each entry, so a question asked of a port or a
table that also holds verbs no longer reaches the verbs. In Maroon Lake that took the valley's
'what is this Thing called' from 47 states it could change to 1. examples/state/write_reach.ludic.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-26 23:19:54 +03:00
..
actions feat(lang): 0.R5 - a reducer writes one state and may read others, declared between its state and the action 2026-09-26 18:23:48 +03:00
ecs refactor(runtime,packages,examples): named constants, package enums, idiom sweep 2026-09-05 01:12:26 +03:00
events wip(0.S3): packages and examples migrated again from their pre-0.S sources in one run 2026-09-25 15:31:34 +03:00
functions wip(0.S3): packages and examples migrated again from their pre-0.S sources in one run 2026-09-25 15:31:34 +03:00
games wip(0.S3): packages and examples migrated again from their pre-0.S sources in one run 2026-09-25 15:31:34 +03:00
lang wip(0.S3): packages and examples migrated again from their pre-0.S sources in one run 2026-09-25 15:31:34 +03:00
library fix(lang): the action drain is the program's; --check runs every check a build makes; a registry key named count is refused; name lookups are tables 2026-09-25 23:34:43 +03:00
modules fix(lang): 0.R4 - ludic.ui's UiAct is its own, and a name that meets a package's export says whose it is 2026-09-26 06:57:35 +03:00
networking examples: net_sync's raw buffer inside unsafe, now that a query's body is checked 2026-09-25 14:43:23 +03:00
rejected feat(lang): 0.R5 - a reducer writes one state and may read others, declared between its state and the action 2026-09-26 18:23:48 +03:00
rendering feat(lang): 0.S - components take states in their header; migrate writes them, never inside a name, never outside the programs given, never into a package's state 2026-09-25 17:11:15 +03:00
state feat(cli): 0.R5 - ludic deps says what a function can come to change (widest_write_reach, --wreach N); a port member and a registry field reach only themselves 2026-09-26 23:19:54 +03:00
README.md refactor(cli)!: split the contributor tool out of the ludic CLI 2026-09-05 23:15:12 +03:00

Examples

A curated tour of Ludic, grouped by intent. Every example here is exercised by the test suite (bin/ludic-dev test / bin/ludic-dev selfhost-test), so nothing in this directory silently rots.

Run any program straight from the repository root (so assets/ resolves):

bin/ludic build examples/games/snake.ludic              # compile + open a real window
bin/ludic build examples/games/snake.ludic --headless   # render one frame to build/out.ppm
bin/ludic examples/lang/offline_rewards.ludic     # compile + run a plain program

games/ — complete, windowed games

Example What it shows
games/snake.ludic A full game from primitives: input, grid, growth, collision, score.
games/menu.ludic A retained-UI title screen — the UI declared as data.
games/chronorift.ludic A 2D co-op JRPG: overworld, dungeon, random encounters, turn battle, boss, save. The entry file imports the modules under games/chronorift/.

rendering/ — drawing primitives

Example What it shows
rendering/draw_prims.ludic The extended Screen.* primitives — line, circle, triangle, fill, sprite.

ecs/ — the entity-component world

Example What it shows
ecs/hello.ludic The smallest program that exercises the ECS pipeline.
ecs/world_get.ludic Reflection: read/write a component by name.
ecs/world_scan.ludic Reflection: scan the world and identify each entity.
ecs/world_query.ludic Reflection: iterate the world by property.
ecs/world_spawn.ludic Reflection: a mod spawns a fresh entity by model id.
ecs/world_mixed.ludic Reflection: get/set through real struct offsets.
ecs/world_dyn.ludic Reflection: register a brand-new component at runtime.

events/ — the event bus

Example What it shows
events/events.ludic EV0: the event-bus core — declare, emit, @On.
events/mod_events.ludic Two listeners on one event, driven from a mod.
events/cancel.ludic EV3: cancellable (decision) events.
events/recurse.ludic EV6: re-entrant emit is depth-bounded — no runaway cycle.
events/promote.ludic EV1: @Public promotes a lifecycle hook to a public event.
events/prop_events.ludic EV1 for properties: attach/detach events.
events/scene_events.ludic EV1 for scenes: on-enter / on-exit events.
events/program_events.ludic EV1 for the program scope: start/quit events.
events/layer_events.ludic EV1 for layers + a public layer's show/hide events.
events/scoped.ludic A despawned entity drops out of subsequent event work.

networking/ — deterministic multiplayer (N0–N6)

Each maps to a stage of the Networking design; all run over the compiler's built-in loopback transport with zero foreign code.

Example What it shows
networking/net_echo.ludic N0: the transport seam.
networking/net_snapshot.ludic N1: whole-world snapshot to a memory buffer.
networking/net_sync.ludic N2: @Sync replication codegen.
networking/net_owner.ludic N3: entity ownership.
networking/net_rpc.ludic N4: remote events / RPCs.
networking/net_roles.ludic N5: handler roles + the drivable sim.
networking/net_demo.ludic N6: a networked game end to end, in pure Ludic.
networking/net_rt.ludic A blessed server-authoritative replication runtime.

lang/ — language & standard-library tour

Example What it shows
lang/annotations.ludic The annotation-first style: @Queries / @Computed / @OnSpawn / @Handles.
lang/qdecl.ludic @Queries desugaring to the query system.
lang/lifecycle.ludic The whole game lifecycle as @-hooks, in firing order.
lang/detach.ludic Structural attach/detach + @OnAttach / @OnDetach.
lang/reason.ludic Reason-carrying teardown (@OnDespawn: Despawned vs Quit).
lang/toggle.ludic enable/disable at the three ECS scopes.
lang/scenes.ludic One active scene at a time, handlers grouped into layers.
lang/strings.ludic Strings as values: compare, join, interpolate, slice.
lang/operators.ludic Compound assignment on every type, unary minus, char escapes, list literals.
lang/rng_demo.ludic The Random.* extensions (value/int/sign).
lang/time_demo.ludic Time.frame / elapsed / delta.
lang/offline_rewards.ludic A worked idle-game example over the Time/Date/Duration stdlib.

library/ — building and linking a shared library

A how-to for compiling a .ludic module to a native .dylib/.so/.dll and linking a second program against it via extern fn:

bin/ludicc examples/library/combat.ludic --shared -o build/libcombat.dylib
bin/ludicc examples/library/arena.ludic  -o build/arena -Lbuild -lcombat
Example What it shows
library/combat.ludic Exported functions callable across the C ABI.
library/arena.ludic A program that links against the shared library.