From 7329880f405ea3d7574409ea4ed401bea5da319c Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Wed, 19 Aug 2020 21:13:05 +0900
Subject: [PATCH] restorable: Make the image stale when volatile state changes

---
 internal/restorable/image.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/internal/restorable/image.go b/internal/restorable/image.go
index 2a072e5c2..6147a26e8 100644
--- a/internal/restorable/image.go
+++ b/internal/restorable/image.go
@@ -154,7 +154,11 @@ func NewImage(width, height int) *Image {
 // reading pixels from GPU are expensive operations. Volatile images can skip such oprations, but the image content
 // is cleared every frame instead.
 func (i *Image) SetVolatile(volatile bool) {
+	changed := i.volatile != volatile
 	i.volatile = volatile
+	if changed {
+		i.makeStale()
+	}
 }
 
 // Extend extends the image by the given size.