Lighting experiments

internal/hero/hero.go

@@ -90,6 +90,10 @@ type Hero struct {
 	lastAnimKey   animationKey
 
 	ProjectileConfig projectile.ProjectileConfig
+
+	// Lighting state
+	InShadow        bool
+	ShadowIntensity float64
 }
 
 type Config struct {
@@ -358,6 +362,11 @@ func (h *Hero) Draw(screen *ebiten.Image) {
 			// no color modification for idle
 		}
 
+		if h.InShadow {
+			darkness := 1.0 - h.ShadowIntensity
+			op.ColorScale.Scale(float32(darkness), float32(darkness), float32(darkness), 1.0)
+		}
+
 		op.Filter = ebiten.FilterNearest
 		screen.DrawImage(sprite, op)
 	}