The example games failed on the CI runner with "ALSA: Couldn't open audio
device" despite SDL_AUDIODRIVER=dummy sitting right there in their CMake --
because it never reached the process. set_tests_properties parses its
PROPERTIES arguments as name/value pairs, so a semicolon-separated value
list is split and every element after the first is consumed as a bogus
property name: ENVIRONMENT kept only SDL_VIDEODRIVER=dummy, and the
LD_LIBRARY_PATH prepend list kept only its first directory. ctest
--show-only=json-v1 shows the truncation plainly.
Nobody could see it. Video survived because SDL3 falls through its driver
list to dummy on a headless machine with no hint at all; audio survived on
every developer machine because the real device works there; the library
paths survived because RPATH covered them. A runner with no sound card was
the first environment where any of it mattered.
Every list-valued test property now goes through set_property(TEST ...),
which takes real list arguments -- the examples' ENVIRONMENT triplets and
vendored-path modifications, the suites' LD_LIBRARY_PATH prepends, and the
docs harness's driver variables. Verified by property dump (3 environment
entries and all 7 prepends present) and by running the example tests with
ALSA_CONFIG_PATH=/dev/null, which now pass where a real ALSA open would
fail: the dummy driver is finally the one being asked.
Co-Authored-By: Claude Code (Claude Fable 5, claude-fable-5) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KzBDV2fqgnUAcqCKqKvc71
examples/sidescroller and examples/jrpg are complete programs, built with the
library and exercised headless by ctest. The chapters quote them with
`c excerpt=examples/...` blocks rather than restating the code, so a chapter
cannot drift from a program that compiles -- the excerpt check fails the moment
the source moves. 34 excerpts in one chapter, 21 in the other.
The two are complementary. The sidescroller is the physics tutorial: gravity, a
jump, coins, hazards. The JRPG is the content-pipeline tutorial: a town map,
NPCs spawned from map objects, four-way per-facing animation, a text box, a
follower.
Both smoke tests drive real SDL_Events through akgl_controller_handle_event and
step the physics clock at a fixed 1/60s rather than sleeping, so a scripted run
is deterministic and finishes in under five seconds.
Writing them is what turned up most of the defects recorded in the next commit,
because a game exercises paths a unit test does not. Each workaround says in the
chapter which library gap forced it:
- collision is written in a custom movementlogicfunc, because
akgl_physics_arcade_collide raises AKERR_API and akgl_physics_simulate never
calls collide at all;
- the sidescroller cancels the step's own gravity when it blocks downward,
because otherwise a quarter-pixel of penetration makes the *horizontal* sweep
report blocked and the character walks backwards a tile at a time;
- both clear movement_controls_face on every map-spawned actor, because the
default facefunc leaves a stopped actor with no facing bit, no sprite, and no
draw;
- the JRPG's follower gets a renderfunc that nulls obj->parent for the duration
of the draw, because a child's offset is counted twice.
Assets are CC0 from three Kenney packs, vendored with per-pack licence text,
per-file provenance, and the geometry contract in
docs/tutorials/assets/README.md. CC0 specifically rather than merely free: a
reader who copies a tutorial into their own game inherits no obligation.
scripts/fetch_tutorial_assets.sh refreshes them in the shape
mkcontrollermappings.sh was fixed into for 0.5.0 -- it checks curl's status,
refuses a pack page that does not say CC0, verifies the archive and the staged
dimensions, and leaves the tracked bytes untouched on any failure. Both failure
paths were tested, and a no-op refresh is byte-identical.
Co-Authored-By: Claude Code <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
