signed distance field tilemap

controls:
WASD - movement
Shift - speed 3x
Tab - examine "chassis" with its "modules"
K - debug mode
Space - build mode
 - E - increase brush size
 - LMB - break
 - RMB - build
otherwise - shoot mode
 - LMB - shoot projectile each tick (accurate)
 - RMB - shoot multiple projectiles with cooldown (inaccurate)

using:
C++, SDL2, OpenGL, EnTT, Emscripten