An empty world at the game's size held 51839 KB of Jolt's heap (200000 bodies, 65536 pairs, 20480
contacts, a 32 MB temp heap), the jolt= floor under every walk. Pairs and contacts come from what
moves - drops, boats, a few walkers - and a valley's still things make none. Now 11743 KB at 200000
bodies and 8461 KB at the 98304 the game opens for (jolt_floor_test holds it under 16 MB). The temp heap
still falls back to malloc for a step that wants more.
lib/macos-arm64 rebuilt; lib/windows-x64 needs native/build.sh on the PC (jph_world_new's new sizes).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Jolt's Allocate/Reallocate/Free/AlignedAllocate/AlignedFree go to libc's malloc with the size in a
16-byte header, and atomic counters keep live bytes, the peak and the blocks asked for (its job
threads allocate too). The fence reads the three exports extern_weak to judge Jolt by its plateau.
jolt_heap_test: a ground in and out 1100 times holds 46,482,514 bytes after the first 100 and after
all of them, the peak does not move, and a closed world gives back every byte it took. The macOS
library is rebuilt; the Windows DLL still has to be rebuilt on the PC.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The package keeps the rules and hands them over each step: speed and heading, whether a jump
leaves, CHAR_STEP and the boots' slope limit. The walker (Jolt CharacterVirtual) does gravity,
landing, steps, slopes and following the ground down. Too steep is ground too steep facing the way
the body wanted to go; stepping off an edge is not. ludic.physics: phys_walker_move (follow the body
if something else moved it, then step), the slope limit, the jump always honoured. The character's
tests run on a real Jolt walker over the same fake world: 15 pass, a knee-high boulder now a step.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Five new tests: stand and walk at the asked speed, a low stone is a step and a tall one a wall, a
jump up and back, a crate shoved aside, a hull turned by a torque and carried by a force.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Our own shim (native/shim/jph_shim.cpp) over Jolt built from the pinned tag with cross-platform
determinism and no fp contraction: shapes as handles (box, sphere, capsule, cylinder, dome,
offset, heightfield, mesh), still/kinematic/dynamic bodies by id with real removal, rays,
top_at and push (what CharacterGround asks), overlaps, buoyancy against the PhysWater port,
contacts recorded in C and drained as PHYS_HIT / PHYS_SPLASH facts. Fixed 1/60 steps, at most four
a frame. Nine tests against the real library, including a pile run twice to the bit.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
