New fields for fat struct.

src/entity.odin

@@ -6,6 +6,7 @@ import rl "vendor:raylib"
 // Generic base structure shared by all world objects.
 // Fields are populated selectively based on entity type.
 // ------------------------------------------------------------------------------
+MAX_TRAILS :: 8
 
 Entity_Type :: enum {
     Player,
@@ -23,17 +24,26 @@ Entity :: struct {
     active:     bool,
     pos:        rl.Vector2,
     shape:      Shape_Type,
+    color:      rl.Color,
+
     // width / height or diameter / diameter
     size:       rl.Vector2,
+
 	// Fixed input speed (paddles)
     speed:      f32,        
     max_speed:  f32,
+
 	// 2D momentum & direction (ball / physics)
     vel:        rl.Vector2,    
     target_y:   f32,
-    reaction_timer: f32
+    reaction_timer: f32,
-}
 
-// ------------------------------------------------------------------------------
+    // animation options
-// @todo: entity dispatchers
+    tween_duration: f32,
-// ------------------------------------------------------------------------------
+    tween_elapsed: f32,
+
+    // trail effect
+    trail_positions: [MAX_TRAILS]rl.Vector2,
+    trail_count:     int,
+    trail_timer:     f32,
+}