From 4ad3d418c2ff95994fce50adb78aee96fb2c7deb Mon Sep 17 00:00:00 2001
From: Rukai <rubickent@gmail.com>
Date: Mon, 3 Jun 2019 22:40:04 +1000
Subject: [PATCH] Ensure wait_for_fences is never called on 0 fences

---
 wgpu-native/src/device.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wgpu-native/src/device.rs b/wgpu-native/src/device.rs
index 9abded8be..395b695ec 100644
--- a/wgpu-native/src/device.rs
+++ b/wgpu-native/src/device.rs
@@ -177,7 +177,7 @@ impl<B: hal::Backend> PendingResources<B> {
         heaps_mutex: &Mutex<Heaps<B>>,
         force_wait: bool,
     ) -> SubmissionIndex {
-        if force_wait {
+        if force_wait && !self.active.is_empty() {
             let status = unsafe {
                 device.wait_for_fences(
                     self.active.iter().map(|a| &a.fence),