Here is a list of all variables with links to the files they belong to:

s : font.lua
S< const > : gamma.lua
sampler2DArray : common.h
save : state.lua
score< const > : harvest_moon.lua
serial< const > : serial.lua
serialize : serial.lua
set : camera.lua
set_double_tap_interval : utils.lua
set_fn : img_common.lua
set_follow : camera.lua
set_fov_z : camera.lua
set_limits : img_common.lua
set_max_colliders : collision.lua
set_max_vel : camera.lua
set_perspective : camera.lua
set_resolve : collision.lua
set_rot_axes : camera.lua
setup_hook : common.lua
shift : utils.lua
shift< const > : input.lua
shift_table : utils.lua
show : menu.lua
SIZE< const > : particles.lua, pil.lua, grid.lua
snare0< const > : drums.lua
snare1< const > : drums.lua
snare< const > : lemon.lua
snare_dur< const > : drums.lua
snare_f< const > : drums.lua
SPEED_FAST : textbox.lua
SPEED_NORMAL : textbox.lua
stars< const > : conway.lua
state : cathedral.lua, conway.lua, fe0.lua, fiona.lua, harvest_moon.lua, house0.lua, house1.lua, light.lua, all.lua, map.lua, state.lua
state< const > : conway.lua, chess.lua, animation.lua
stats : timeline.lua
sun : light.lua
sword_bb : zelda.lua