diff --git a/Cargo.lock b/Cargo.lock
index 6ebec47..8fcc68c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13,7 +13,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "ash"
-version = "0.24.2"
+version = "0.24.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -36,7 +36,7 @@ name = "backtrace"
 version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace-sys 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-demangle 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -45,11 +45,12 @@ dependencies = [
 
 [[package]]
 name = "backtrace-sys"
-version = "0.1.19"
+version = "0.1.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -69,7 +70,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cc"
-version = "1.0.15"
+version = "1.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -82,7 +83,7 @@ name = "cgl"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -252,7 +253,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "gfx-backend-dx12"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#448cbebc020961c31fda456b9633273262bbb720"
+source = "git+https://github.com/gfx-rs/gfx#6d295a541bfe173890a8ccb450b8a759b71786b2"
 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)",
@@ -268,7 +269,7 @@ dependencies = [
 [[package]]
 name = "gfx-backend-metal"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#448cbebc020961c31fda456b9633273262bbb720"
+source = "git+https://github.com/gfx-rs/gfx#6d295a541bfe173890a8ccb450b8a759b71786b2"
 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)",
@@ -289,12 +290,12 @@ dependencies = [
 [[package]]
 name = "gfx-backend-vulkan"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#448cbebc020961c31fda456b9633273262bbb720"
+source = "git+https://github.com/gfx-rs/gfx#6d295a541bfe173890a8ccb450b8a759b71786b2"
 dependencies = [
- "ash 0.24.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ash 0.24.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx-hal 0.1.0 (git+https://github.com/gfx-rs/gfx)",
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "shared_library 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -307,7 +308,7 @@ dependencies = [
 [[package]]
 name = "gfx-hal"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#448cbebc020961c31fda456b9633273262bbb720"
+source = "git+https://github.com/gfx-rs/gfx#6d295a541bfe173890a8ccb450b8a759b71786b2"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -334,7 +335,7 @@ dependencies = [
 
 [[package]]
 name = "gleam"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "gl_generator 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -345,7 +346,7 @@ name = "humantime"
 version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "quick-error 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -380,7 +381,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lazy_static"
-version = "1.0.0"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -406,7 +407,7 @@ name = "libloading"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -520,7 +521,7 @@ dependencies = [
  "gfx-backend-metal 0.1.0 (git+https://github.com/gfx-rs/gfx)",
  "gfx-backend-vulkan 0.1.0 (git+https://github.com/gfx-rs/gfx)",
  "gfx-hal 0.1.0 (git+https://github.com/gfx-rs/gfx)",
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -533,7 +534,7 @@ dependencies = [
 
 [[package]]
 name = "quick-error"
-version = "1.2.1"
+version = "1.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -602,7 +603,7 @@ name = "shared_library"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -616,7 +617,7 @@ name = "spirv_cross"
 version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -624,7 +625,7 @@ name = "spirv_cross"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -698,7 +699,7 @@ name = "thread_local"
 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -754,7 +755,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "dlib 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-client 0.12.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -784,7 +785,7 @@ version = "0.12.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dlib 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -834,7 +835,7 @@ dependencies = [
  "cocoa 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -868,7 +869,7 @@ name = "x11-dl"
 version = "2.17.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -893,14 +894,14 @@ dependencies = [
 [metadata]
 "checksum aho-corasick 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d6531d44de723825aa81398a6415283229725a00fa30713812ab9323faa82fc4"
 "checksum android_glue 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "000444226fcff248f2bc4c7625be32c63caccfecc2723a2b9f78a7487a49c407"
-"checksum ash 0.24.2 (registry+https://github.com/rust-lang/crates.io-index)" = "5c8a478185c0a8ceea60c8cfb7a2e7420e6e30e95550384a77c2a9386c7c111c"
+"checksum ash 0.24.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fb9df6efb2ee4200129dc4e7f0ac7065a0eabc03adfc22494689a73c410eae82"
 "checksum atty 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "2fc4a1aa4c24c0718a250f0681885c1af91419d242f29eb8f2ab28502d80dbd1"
 "checksum backtrace 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "dbdd17cd962b570302f5297aea8648d5923e22e555c2ed2d8b2e34eca646bf6d"
-"checksum backtrace-sys 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)" = "3951a5d75651d5817056daf3132ed9cd7918bc7f2afc313b379009e832209a4d"
+"checksum backtrace-sys 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)" = "5fd343a2466c4603f76f38de264bc0526cffc7fa38ba52fb9f13237eccc1ced2"
 "checksum bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "d0c54bb8f454c567f21197eefcdbf5679d0bd99f2ddbe52e84c77061952e6789"
 "checksum block 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0d8c1fef690941d3e7788d328517591fecc684c084084702d6ff1641e993699a"
 "checksum byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "74c0b906e9446b0a2e4f760cdb3fa4b2c48cdc6db8766a845c54b6ff063fd2e9"
-"checksum cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)" = "0ebb87d1116151416c0cf66a0e3fb6430cccd120fd6300794b4dfaa050ac40ba"
+"checksum cc 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)" = "49ec142f5768efb5b7622aebc3fdbdbb8950a4b9ba996393cb76ef7466e8747d"
 "checksum cfg-if 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "405216fd8fe65f718daa7102ea808a946b6ce40c742998fbfd3463645552de18"
 "checksum cgl 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "80f05e25f9631fdee56693110feda284a49308ca1e768857a0ad3906cfc1502a"
 "checksum cocoa 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b0c23085dde1ef4429df6e5896b89356d35cdd321fb43afe3e378d010bb5adc6"
@@ -928,13 +929,13 @@ dependencies = [
 "checksum gfx-hal 0.1.0 (git+https://github.com/gfx-rs/gfx)" = "<none>"
 "checksum gl_generator 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a795170cbd85b5a7baa58d6d7525cae6a03e486859860c220f7ebbbdd379d0a"
 "checksum gleam 0.4.34 (registry+https://github.com/rust-lang/crates.io-index)" = "b4e5e2cdcadecdf3886e7808b6a38eae0a48dfe98c5c12b776fc861b80edf4a2"
-"checksum gleam 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e47b39459e47b76be4d2c82702932cdc66df09dcb8f813424167991adb8b3380"
+"checksum gleam 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "12b793fcf40a23dd372f184c228ab3eb96f88c50bb4fba8319c483aa025a4e45"
 "checksum humantime 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0484fda3e7007f2a4a0d9c3a703ca38c71c54c55602ce4660c419fd32e188c9e"
 "checksum io-surface 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dd46b8bb9528ad2b433e4be99f949ab7bce7bc46fbe6c54cd556d3d18b5930af"
 "checksum itertools 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4833d6978da405305126af4ac88569b5d71ff758581ce5a987dbfa3755f694fc"
 "checksum khronos_api 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "037ab472c33f67b5fbd3e9163a2645319e5356fcd355efa6d4eb7fff4bbcb554"
 "checksum lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "76f033c7ad61445c5b347c7382dd1237847eb1bce590fe50365dcb33d546be73"
-"checksum lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c8f31047daa365f19be14b47c29df4f7c3b581832407daabe6ae77397619237d"
+"checksum lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e6412c5e2ad9584b0b8e979393122026cdd6d2a80b933f890dcd694ddbe73739"
 "checksum leak 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bd100e01f1154f2908dfa7d02219aeab25d0b9c7fa955164192e3245255a0c73"
 "checksum leaky-cow 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "40a8225d44241fd324a8af2806ba635fc7c8a7e9a7de4d5cf3ef54e71f5926fc"
 "checksum libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)" = "ac8ebf8343a981e2fa97042b14768f02ed3e1d602eac06cae6166df3c8ced206"
@@ -950,7 +951,7 @@ dependencies = [
 "checksum objc_id 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e4730aa1c64d722db45f7ccc4113a3e2c465d018de6db4d3e7dfe031e8c8a297"
 "checksum percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
 "checksum pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)" = "110d5ee3593dbb73f56294327fe5668bcc997897097cbc76b51e7aed3f52452f"
-"checksum quick-error 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "eda5fe9b71976e62bc81b781206aaa076401769b2143379d3eb2118388babac4"
+"checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
 "checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
 "checksum rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "eba5f8cb59cc50ed56be8880a5c7b496bfd9bd26394e176bc67884094145c2c5"
 "checksum redox_syscall 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)" = "0a12d51a5b5fd700e6c757f15877685bfa04fd7eb60c108f01d045cafa0073c2"
diff --git a/libportability-gfx/src/impls.rs b/libportability-gfx/src/impls.rs
index 6e33679..67513d2 100644
--- a/libportability-gfx/src/impls.rs
+++ b/libportability-gfx/src/impls.rs
@@ -2678,12 +2678,16 @@ pub extern "C" fn gfxCmdSetLineWidth(mut commandBuffer: VkCommandBuffer, lineWid
 }
 #[inline]
 pub extern "C" fn gfxCmdSetDepthBias(
-    _commandBuffer: VkCommandBuffer,
-    _depthBiasConstantFactor: f32,
-    _depthBiasClamp: f32,
-    _depthBiasSlopeFactor: f32,
+    mut commandBuffer: VkCommandBuffer,
+    depthBiasConstantFactor: f32,
+    depthBiasClamp: f32,
+    depthBiasSlopeFactor: f32,
 ) {
-    unimplemented!()
+    commandBuffer.set_depth_bias(pso::DepthBias {
+        const_factor: depthBiasConstantFactor,
+        clamp: depthBiasClamp,
+        slope_factor: depthBiasSlopeFactor,
+    });
 }
 #[inline]
 pub extern "C" fn gfxCmdSetBlendConstants(