diff --git a/Cargo.lock b/Cargo.lock
index 965ba82..ac4ce8c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -297,7 +297,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "gfx-backend-dx11"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#9bcdcade4005cfa8aca23ca2fa06ae8a0166d400"
+source = "git+https://github.com/gfx-rs/gfx#b1d4dc52a1e357a892cb08a634e1b9ac2ae7b400"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "derivative 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -314,7 +314,7 @@ dependencies = [
 [[package]]
 name = "gfx-backend-dx12"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#9bcdcade4005cfa8aca23ca2fa06ae8a0166d400"
+source = "git+https://github.com/gfx-rs/gfx#b1d4dc52a1e357a892cb08a634e1b9ac2ae7b400"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "derivative 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -330,7 +330,7 @@ dependencies = [
 [[package]]
 name = "gfx-backend-metal"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#9bcdcade4005cfa8aca23ca2fa06ae8a0166d400"
+source = "git+https://github.com/gfx-rs/gfx#b1d4dc52a1e357a892cb08a634e1b9ac2ae7b400"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "block 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -339,7 +339,7 @@ dependencies = [
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx-hal 0.1.0 (git+https://github.com/gfx-rs/gfx)",
  "log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "metal 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "metal 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -351,7 +351,7 @@ dependencies = [
 [[package]]
 name = "gfx-backend-vulkan"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#9bcdcade4005cfa8aca23ca2fa06ae8a0166d400"
+source = "git+https://github.com/gfx-rs/gfx#b1d4dc52a1e357a892cb08a634e1b9ac2ae7b400"
 dependencies = [
  "ash 0.24.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -368,7 +368,7 @@ dependencies = [
 [[package]]
 name = "gfx-hal"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#9bcdcade4005cfa8aca23ca2fa06ae8a0166d400"
+source = "git+https://github.com/gfx-rs/gfx#b1d4dc52a1e357a892cb08a634e1b9ac2ae7b400"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -508,7 +508,7 @@ dependencies = [
 
 [[package]]
 name = "metal"
-version = "0.11.0"
+version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1219,7 +1219,7 @@ dependencies = [
 "checksum malloc_buf 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "62bb907fe88d54d8d9ce32a3cceab4218ed2f6b7d35617cafe9adf84e43919cb"
 "checksum memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "796fba70e76612589ed2ce7f45282f5af869e0fdd7cc6199fa1aa1f1d591ba9d"
 "checksum memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e2ffa2c986de11a9df78620c01eeaaf27d94d3ff02bf81bfcca953102dd0c6ff"
-"checksum metal 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8151cbdf907826778c8979626f0e76ea5f855e81433f098219914a7ea8e87e21"
+"checksum metal 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cfcaa9d93f108f30a65a7ae5617e6a78e1ef5ca2c05e59e84d950274ec6743ea"
 "checksum nix 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d37e713a259ff641624b6cb20e3b12b2952313ba36b6823c0f16e6cfd9e5de17"
 "checksum objc 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "9833ab0efe5361b1e2122a0544a5d3359576911a42cb098c2e59be8650807367"
 "checksum objc-foundation 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1add1b659e36c9607c7aab864a76c7a4c2760cd0cd2e120f3fb8b952c7e22bf9"
diff --git a/Makefile b/Makefile
index 10623d3..310cd37 100644
--- a/Makefile
+++ b/Makefile
@@ -73,6 +73,9 @@ version-release:
 
 
 dota-debug: version-debug $(DOTA_EXE)
+	DYLD_LIBRARY_PATH=$(CURDIR)/target/debug:$(CURDIR)/$(DOTA_DIR) $(DOTA_EXE) $(DOTA_PARAMS_GFX)
+
+dota-debugger: version-debug $(DOTA_EXE)
 	echo "env DYLD_LIBRARY_PATH=$(CURDIR)/target/debug:$(CURDIR)/$(DOTA_DIR)" >.lldbinit
 	DYLD_LIBRARY_PATH=$(CURDIR)/target/debug:$(CURDIR)/$(DOTA_DIR) $(DEBUGGER) $(DOTA_EXE) $(DOTA_PARAMS_GFX)
 
@@ -94,6 +97,13 @@ dota-bench-orig: $(DOTA_EXE)
 dota-bench-gl: $(DOTA_EXE)
 	DYLD_LIBRARY_PATH=$(CURDIR)/target/release:$(CURDIR)/$(DOTA_DIR) $(DOTA_EXE) $(DOTA_BENCHMARK) -gl
 
+ifeq ($(UNAME_S),Darwin)
+target/debug/libMoltenVK.dylib: version-debug
+	cd target/debug && ln -sf libportability.dylib libMoltenVK.dylib
+target/release/libMoltenVK.dylib: version-release
+	cd target/release && ln -sf libportability.dylib libMoltenVK.dylib
+molten-links: target/debug/libMoltenVK.dylib target/release/libMoltenVK.dylib
+endif
 
 binding: $(BINDING)
 
diff --git a/libportability-gfx/src/impls.rs b/libportability-gfx/src/impls.rs
index 6ea5adb..63c1fa6 100644
--- a/libportability-gfx/src/impls.rs
+++ b/libportability-gfx/src/impls.rs
@@ -692,7 +692,7 @@ pub extern "C" fn gfxCreateDevice(
                         //"remote" => OnlineRecording::Remote(dispatch::QueuePriority::Default),
                         other => panic!("unknown recording option: {}", other),
                     };
-                    println!("GFX: environment override {:?}", gpu.device.online_recording);
+                    println!("GFX: recording override {:?}", gpu.device.online_recording);
                 }
             }
 
@@ -949,6 +949,23 @@ pub extern "C" fn gfxGetDeviceQueue(
     let queue = gpu.queues
         .get(&queueFamilyIndex)
         .unwrap()[queueIndex as usize];
+
+        #[cfg(feature = "gfx-backend-metal")]
+        {
+            use std::env;
+
+            if let Ok(value) = env::var("GFX_METAL_STITCHING") {
+                let mut q = queue;
+                q.stitch_deferred = match value.to_lowercase().as_str() {
+                    "yes" => true,
+                    "no" => false,
+                    other => panic!("unknown stitching option: {}", other),
+                };
+                println!("GFX: stitching override {:?}", q.stitch_deferred);
+            }
+        }
+
+
     unsafe {
         *pQueue = queue;
     }