From e727fd90180bb1175330f3eb9eb64a8a70998f62 Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Mon, 24 Jun 2019 11:45:44 -0700
Subject: [PATCH] Try to work around #199

---
 metal/src/lib.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/metal/src/lib.rs b/metal/src/lib.rs
index 13f157bc..41a11c80 100644
--- a/metal/src/lib.rs
+++ b/metal/src/lib.rs
@@ -868,6 +868,11 @@ impl MetalDevice {
 
         render_command_encoder.use_resource(&data_buffer, MTLResourceUsage::Read);
 
+        // Metal expects the data buffer to remain live. (Issue #199.)
+        // FIXME(pcwalton): When do we deallocate this? What are the expected
+        // lifetime semantics?
+        mem::forget(data_buffer);
+
         if let Some(vertex_argument_buffer) = vertex_argument_buffer {
             let range = NSRange::new(0, vertex_argument_buffer.length());
             vertex_argument_buffer.did_modify_range(range);