- libs/game/sim/dynamics.rs: box3d world inside GameWorld, body mirror
RECONCILED against the sorted entity list per tick (merge-walk), so
retain/rollback/reset are correct by construction. Statics + kinematics
mirrored (kinematics via target transforms so resting rigids inherit
platform velocity); smooth terrain as a box3d heightfield
- New BodyKind::Rigid + body:"rigid" with density/friction/restitution;
game.push = mass-scaled impulse; set_pos/set_vel detected via bit-exact
pose caches (no new dispatch arms). Sphere rigids roll on real spheres
- Entity.orient quat read back per tick; renderer builds quat instance
transforms for rigids (no shader change). Step order: mover sweep
verbatim -> reconcile -> world_step(dt, 4) -> readback; rigid-free
worlds skip the solver
- GameWorld stays Clone via box3d snapshot round-trip (bit-identical
continuation proven by test)
- Determinism: double-run equality + golden hash 0xa8a2baf71e4a564f
(aarch64, debug and release). Perf: 0.038 ms/tick for 100 movers +
50 rigids + 65x65 terrain (budget 2 ms)
- Tape probe BYTE_IDENTICAL; box3d crate untouched; arcade demo gains a
kicked crate stack (captures verified: settles upright, then topples
with rotated resting poses)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
- libs/game/math: cross-arch bit-deterministic f32 kernel (f64-internal
fdlibm-style polynomial kernels, exactly-rounded IEEE ops only, zero
platform-libm transcendentals). Parity golden hashes recorded on aarch64;
equal hashes on every other target IS the determinism test
- libs/game/sim: the gamemaker world moved verbatim (entity/terrain/world/
queries/step — float expression order preserved so tapes replay
bit-identically). No Cx, no draw types, no ScriptObjectRef: script
callbacks are CallbackSlots resolved through a generation-tagged
host-side CallbackTable in game_view.rs; sim reset no longer touches audio
- examples/gamemaker: game_view.rs 5545 -> 4640 lines (script boundary,
rendering, input devices, host I/O remain); per-tick args/input objects
built via unchecked pushes + release_transient (flat-heap tick path)
- apps/arcade: Makepad Arcade app shell + workspace membership
- Verified: headless sandbox3d fixture (90 entities) boots end-to-end;
gamemaker/sim/math/script-test suites green
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
