End-of-game scores are POSTed to a configurable backend URL; the main menu
gains a "Global Leaderboard" entry that fetches and renders the top N for
the current board. Default `global_leaderboard=0` ships the code dormant
until the backend at leaderboard_url is live.
Architecture:
- httpclient.h: thin async interface. http_post_json / http_get fire and
forget; the user callback runs from http_pump() (native) or the
Emscripten runtime (web). No blocking calls.
- httpclient_native.cpp: libcurl-multi, polled per frame.
- httpclient_web.cpp: emscripten_fetch (-sFETCH=1 link option).
- leaderboard.{h,cpp}: portable game-side module. Hand-rolled JSON
build/parse for the tiny fixed-shape wire format; no JSON dep.
Identity: player name + a player-typed "board name" (shared room code).
A per-install RFC-4122-v4 UUID `client_id` is auto-generated on first run
via SDL_rand_bits and stored in the config — server uses it for rate
limiting / dedup, not as a public identity.
Wire format (informational, server is out-of-tree):
POST /api/scores body: {board, name, client_id, score, skill,
gametype, end_scene, end_lives, end_health,
playtime, start_date, end_date}
resp: {rank, total}
GET /api/scores?board=&limit=50
resp: {board, total, scores:[{name,score,end_scene}]}
Hook points:
- manage.cpp game_start: populate hi.start_date; reset_submission().
- manage.cpp game_stop: populate hi.end_date and the profile name on hi,
then leaderboard::submit_score after scorefile.record.
- kobo.cpp main: http_init/http_shutdown around the run; generate
client_id on first run when empty.
- kobo.cpp kobo_gfxengine_t::frame: http_pump() before gsm.frame().
- states.cpp st_game_over post_render: renders "Submitting…" / "Rank #N of M"
/ "(offline)" under "GAME OVER".
- states.cpp main_menu: "Global Leaderboard" button (only when enabled
+ board name set).
- states.cpp st_global_leaderboard_t: new browser state listing top 16.
- options.cpp game_options: onoff toggle.
Out of scope for this commit (left as follow-ups):
- In-game text editor for board name / URL (form toolkit has no free-text
widget; users edit via config file or CLI flags for now).
- Retry queue across sessions.
- Server implementation. tools/mock-leaderboard.py is a 100-line Python
scratch server for local testing only.
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Co-Authored-By: Claude <noreply@anthropic.com>
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Co-Authored-By: Claude <noreply@anthropic.com>
