From 46501f296a02846a87010fd6d5123877e76e3c1b Mon Sep 17 00:00:00 2001
From: m4b <m4b.github.io@gmail.com>
Date: Sun, 15 Sep 2019 12:30:38 -0700
Subject: [PATCH] print usage required during device usage validation

fixes #339
---
 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 7dad53fb9..79a2d7271 100644
--- a/wgpu-native/src/device.rs
+++ b/wgpu-native/src/device.rs
@@ -1215,7 +1215,7 @@ pub fn device_create_bind_group<B: GfxBackend>(
                         .buffers
                         .use_extend(&*buffer_guard, bb.buffer, (), usage)
                         .unwrap();
-                    assert!(buffer.usage.contains(usage));
+                    assert!(buffer.usage.contains(usage), "Expected buffer usage {:?}", usage);
 
                     let end = if bb.size == 0 {
                         None