add networking, 3d improvements, reorganize src structure

demo/mod/vfx.fnl

@@ -0,0 +1,75 @@
+(local vfx {})
+
+(fn vfx.explosion [ps x y ?opts]
+  (let [opts (or ?opts {})
+        color (or opts.color 208)
+        force (or opts.force 200)]
+    (ps:set_position x y)
+    (ps:set_colors color (+ color 15))
+    (ps:set_velocity (- force) force (- force) force)
+    (ps:set_gravity 0 100)
+    (ps:set_life 0.3 0.8)
+    (ps:set_size 1 3)
+    (ps:set_drag 0.98)
+    (ps:set_spawn_rate 0)
+    (ps:emit (or opts.count 50))))
+
+(fn vfx.fire [ps x y ?opts]
+  (let [opts (or ?opts {})
+        width (or opts.width 50)
+        color (or opts.color 208)]
+    (ps:set_position x y)
+    (ps:set_spread width 5)
+    (ps:set_colors color (+ color 15))
+    (ps:set_velocity -20 20 -80 -40)
+    (ps:set_gravity 0 -30)
+    (ps:set_life 0.5 1.5)
+    (ps:set_size 1 2)
+    (ps:set_turbulence 30)
+    (ps:set_drag 0.95)
+    (ps:set_spawn_rate (or opts.rate 50))))
+
+(fn vfx.rain [ps width ?opts]
+  (let [opts (or ?opts {})
+        wind (or opts.wind 0)
+        color (or opts.color 153)]
+    (ps:set_position (/ width 2) -10)
+    (ps:set_spread width 0)
+    (ps:set_colors color (+ color 3))
+    (ps:set_velocity (- wind 10) (+ wind 10) 300 400)
+    (ps:set_gravity 0 200)
+    (ps:set_life 1 2)
+    (ps:set_size 1 1)
+    (ps:set_drag 1)
+    (ps:set_spawn_rate (or opts.rate 100))))
+
+(fn vfx.smoke [ps x y ?opts]
+  (let [opts (or ?opts {})
+        color (or opts.color 248)]
+    (ps:set_position x y)
+    (ps:set_spread 10 5)
+    (ps:set_colors color (+ color 7))
+    (ps:set_velocity -15 15 -30 -10)
+    (ps:set_gravity 0 -20)
+    (ps:set_life 1 3)
+    (ps:set_size 2 4)
+    (ps:set_turbulence 20)
+    (ps:set_drag 0.98)
+    (ps:set_spawn_rate (or opts.rate 20))))
+
+(fn vfx.snow [ps width ?opts]
+  (let [opts (or ?opts {})
+        wind (or opts.wind 10)
+        color (or opts.color 15)]
+    (ps:set_position (/ width 2) -10)
+    (ps:set_spread width 0)
+    (ps:set_colors color color)
+    (ps:set_velocity (- wind 20) (+ wind 20) 30 60)
+    (ps:set_gravity 0 10)
+    (ps:set_life 3 6)
+    (ps:set_size 1 2)
+    (ps:set_turbulence 15)
+    (ps:set_drag 0.99)
+    (ps:set_spawn_rate (or opts.rate 30))))
+
+vfx