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Implements win-condition path (c): destroy the enemy reactor by cutting
its supports so it falls. Previously devices sat at fixed map coordinates,
structurally immune to collapse.
- BuildGraph gains MountedDevice tracking: mount_device/unmount_device,
is_device_alive/get_device_hp/damage_device, nearest_device, with a
break_node index-shift fix so mount references stay correct as other
geometry on the same fort is destroyed. update_fire now also damages
any device mounted on a burning strut.
- app.cpp mounts devices onto the nearest strut (within 2 units) at both
map-load and interactive placement, and after each tick's structural
collapse pass, zeroes a device's HP if its mount didn't survive -- which
flows through the existing win-condition/cleanup code unchanged.
- tools/device_collapse_test.cpp: 15 headless tests covering collapse,
partial support loss, splash/beam/fire-through-mount damage, multiple
devices, index stability, and clean unmount.
Verified: full test suite passes (15/15), sim_check shows zero regressions
across all 3 maps.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Open-source Forts clone: custom C++20 engine + data-driven (Lua) 2D physics
artillery RTS.
- Building: node/strut graph on a stiff mass-spring solver (canon Forts model),
triangulation rigidity, axial + 30-degree angle-stress breaking, cascading
collapse, fire (DoT + spread), ground destroys debris.
- Weapons (M4): cannon (ballistic) + laser (beam/ignite) with select-and-aim-in-
arc UX; splash / beam damage; bg-brace passthrough.
- Devices + economy (M5): reactors + win/loss + restart, mines/turbines/battery,
metal deposits, storage caps, per-shot energy cost.
- Data-driven via Lua/sol2 with a layered mod loader; enemy-fort scenario mod.
- Renderer: SDL3 + textures + ImGui dev UI. stb_image + ImGui vendored.
- Assets: CC0 placeholders only; real game art loaded at runtime from the user's
own install via forts: paths (bring-your-own; nothing copyrighted committed).
See README.md / CLAUDE.md and research/ + requirements/ for detail.
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