Note that there'd be utility functions

std.func

@@ -23,6 +23,7 @@ type Time = Time Real # Unix time
 type Duration = Duration Real # In seconds
 type Timeline a = Change Duration a Timeline a | Future Duration Timeline a | End
 
+# Inputs
 type MouseButton = Primary | Secondary | Middle
 type Coord = Coord Real Real
 type Mouse = Scroll Signed Signed |
@@ -32,7 +33,10 @@ type Keyboard = Down Char | Up Char | Press Char
 type Touch = Down Coord | Move Coord | Up Coord
 type GameControl = # TODO
 
-type Color = Color Byte Byte Byte Byte
+# Outputs
+type Color = Color Byte Byte Byte Byte # red green blue opacity
 type Rect = Rect Coord Coord # topleft size
 type Image = Fill Color Rect | Sprite Image Image # foreground background, with foreground clipped to background
-type Sound = Sound List Tuple Real Real
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+type Sound = Sound List Tuple Real Real
+
+# TODO functions to operate on these types
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