diff --git a/Cargo.lock b/Cargo.lock
index e9f2e42..64d5aa0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,8 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "aho-corasick"
-version = "0.6.10"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -8,12 +10,12 @@ dependencies = [
 
 [[package]]
 name = "andrew"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "line_drawing 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rusttype 0.7.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rusttype 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "xdg 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "xml-rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -29,7 +31,7 @@ name = "approx"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -42,10 +44,9 @@ dependencies = [
 
 [[package]]
 name = "ash"
-version = "0.28.0"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "shared_library 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -54,27 +55,26 @@ name = "atty"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
- "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termion 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "autocfg"
-version = "0.1.2"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "backtrace"
-version = "0.3.14"
+version = "0.3.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -82,8 +82,8 @@ name = "backtrace-sys"
 version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.37 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -96,6 +96,11 @@ name = "block"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "bumpalo"
+version = "2.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byteorder"
 version = "1.3.1"
@@ -103,12 +108,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cc"
-version = "1.0.32"
+version = "1.0.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.7"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -116,8 +121,8 @@ name = "cgl"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gleam 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.6.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -136,7 +141,7 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "block 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -147,16 +152,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "block 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "copyless"
-version = "0.1.2"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -165,16 +170,16 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "core-foundation"
-version = "0.6.3"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -182,7 +187,7 @@ name = "core-foundation-sys"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -198,7 +203,7 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -207,9 +212,9 @@ version = "0.17.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -218,7 +223,7 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -226,9 +231,9 @@ name = "derivative"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -241,7 +246,7 @@ dependencies = [
 
 [[package]]
 name = "downcast-rs"
-version = "1.0.3"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -252,7 +257,7 @@ dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "humantime 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -261,7 +266,7 @@ name = "failure"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -270,10 +275,10 @@ name = "failure_derive"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.29 (registry+https://github.com/rust-lang/crates.io-index)",
- "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synstructure 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -309,90 +314,113 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "gfx-backend-dx11"
-version = "0.1.1"
-source = "git+https://github.com/gfx-rs/gfx#5b84957d47592969507fb9e9b69810af13098819"
+version = "0.2.0"
+source = "git+https://github.com/gfx-rs/gfx#227053cffc56fe20295ff0844ea4a49b52db20bf"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "derivative 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "gfx-hal 0.1.0 (git+https://github.com/gfx-rs/gfx)",
+ "gfx-hal 0.2.0 (git+https://github.com/gfx-rs/gfx)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "range-alloc 0.1.0 (git+https://github.com/gfx-rs/gfx)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "spirv_cross 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "winit 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "wio 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "spirv_cross 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winit 0.19.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wio 0.2.2 (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#5b84957d47592969507fb9e9b69810af13098819"
+version = "0.2.0"
+source = "git+https://github.com/gfx-rs/gfx#227053cffc56fe20295ff0844ea4a49b52db20bf"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "d3d12 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "derivative 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "gfx-hal 0.1.0 (git+https://github.com/gfx-rs/gfx)",
+ "gfx-hal 0.2.0 (git+https://github.com/gfx-rs/gfx)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "range-alloc 0.1.0 (git+https://github.com/gfx-rs/gfx)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "spirv_cross 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "winit 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "spirv_cross 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winit 0.19.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gfx-backend-gl"
+version = "0.2.0"
+source = "git+https://github.com/gfx-rs/gfx#227053cffc56fe20295ff0844ea4a49b52db20bf"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gfx-hal 0.2.0 (git+https://github.com/gfx-rs/gfx)",
+ "gfx_gl 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "spirv_cross 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gfx-backend-metal"
-version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#5b84957d47592969507fb9e9b69810af13098819"
+version = "0.2.0"
+source = "git+https://github.com/gfx-rs/gfx#227053cffc56fe20295ff0844ea4a49b52db20bf"
 dependencies = [
  "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "block 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "cocoa 0.18.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "copyless 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "copyless 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "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)",
+ "gfx-hal 0.2.0 (git+https://github.com/gfx-rs/gfx)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "metal 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "range-alloc 0.1.0 (git+https://github.com/gfx-rs/gfx)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "spirv_cross 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "spirv_cross 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "storage-map 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "winit 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winit 0.19.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gfx-backend-vulkan"
-version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#5b84957d47592969507fb9e9b69810af13098819"
+version = "0.2.0"
+source = "git+https://github.com/gfx-rs/gfx#227053cffc56fe20295ff0844ea4a49b52db20bf"
 dependencies = [
- "ash 0.28.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ash 0.29.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gfx-hal 0.1.0 (git+https://github.com/gfx-rs/gfx)",
+ "derivative 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gfx-hal 0.2.0 (git+https://github.com/gfx-rs/gfx)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "winit 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winit 0.19.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "x11 2.18.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "xcb 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gfx-hal"
-version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#5b84957d47592969507fb9e9b69810af13098819"
+version = "0.2.0"
+source = "git+https://github.com/gfx-rs/gfx#227053cffc56fe20295ff0844ea4a49b52db20bf"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "gfx_gl"
+version = "0.5.0"
+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)",
+]
+
 [[package]]
 name = "gl_generator"
 version = "0.9.0"
@@ -405,20 +433,20 @@ dependencies = [
 
 [[package]]
 name = "gl_generator"
-version = "0.10.0"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "khronos_api 3.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "khronos_api 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "xml-rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gleam"
-version = "0.6.14"
+version = "0.6.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gl_generator 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -433,16 +461,76 @@ dependencies = [
  "core-graphics 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "gl_generator 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "osmesa-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "shared_library 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-client 0.12.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "winit 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "x11-dl 2.18.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "glutin"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "android_glue 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cgl 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cocoa 0.18.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin_egl_sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin_gles2_sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin_glx_sys 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin_wgl_sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libloading 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "osmesa-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shared_library 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-client 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winit 0.19.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "glutin_egl_sys"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "glutin_gles2_sys"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "glutin_glx_sys"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "x11-dl 2.18.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "glutin_wgl_sys"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gl_generator 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "humantime"
 version = "1.2.0"
@@ -451,6 +539,14 @@ dependencies = [
  "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "js-sys"
+version = "0.3.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "wasm-bindgen 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "khronos_api"
 version = "2.2.0"
@@ -458,7 +554,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "khronos_api"
-version = "3.0.0"
+version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -473,7 +569,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.50"
+version = "0.2.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -481,8 +577,8 @@ name = "libloading"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.37 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -490,7 +586,7 @@ name = "line_drawing"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -507,7 +603,7 @@ name = "log"
 version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -515,7 +611,7 @@ name = "malloc_buf"
 version = "0.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -528,8 +624,8 @@ name = "memmap"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -537,8 +633,8 @@ name = "memmap"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -551,34 +647,22 @@ dependencies = [
  "cocoa 0.18.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc-foundation 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc_id 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "nix"
-version = "0.12.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
- "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "nix"
 version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.37 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -589,7 +673,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "num-traits"
-version = "0.2.6"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "numtoa"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -632,7 +724,7 @@ name = "ordered-float"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -674,11 +766,11 @@ name = "parking_lot_core"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -686,11 +778,11 @@ name = "parking_lot_core"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -714,13 +806,14 @@ dependencies = [
 name = "portability-gfx"
 version = "0.1.0"
 dependencies = [
- "copyless 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "copyless 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "gfx-backend-dx11 0.1.1 (git+https://github.com/gfx-rs/gfx)",
- "gfx-backend-dx12 0.1.0 (git+https://github.com/gfx-rs/gfx)",
- "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)",
+ "gfx-backend-dx11 0.2.0 (git+https://github.com/gfx-rs/gfx)",
+ "gfx-backend-dx12 0.2.0 (git+https://github.com/gfx-rs/gfx)",
+ "gfx-backend-gl 0.2.0 (git+https://github.com/gfx-rs/gfx)",
+ "gfx-backend-metal 0.2.0 (git+https://github.com/gfx-rs/gfx)",
+ "gfx-backend-vulkan 0.2.0 (git+https://github.com/gfx-rs/gfx)",
+ "gfx-hal 0.2.0 (git+https://github.com/gfx-rs/gfx)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "renderdoc 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -735,7 +828,7 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.27"
+version = "0.4.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -748,10 +841,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "quote"
-version = "0.6.11"
+version = "0.6.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -761,9 +854,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -771,17 +864,17 @@ name = "rand"
 version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_jitter 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_jitter 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_pcg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -789,7 +882,7 @@ name = "rand_chacha"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -824,12 +917,12 @@ dependencies = [
 
 [[package]]
 name = "rand_jitter"
-version = "0.1.3"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -839,10 +932,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -850,7 +943,7 @@ name = "rand_pcg"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -865,7 +958,7 @@ dependencies = [
 [[package]]
 name = "range-alloc"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#5b84957d47592969507fb9e9b69810af13098819"
+source = "git+https://github.com/gfx-rs/gfx#227053cffc56fe20295ff0844ea4a49b52db20bf"
 
 [[package]]
 name = "rdrand"
@@ -877,7 +970,7 @@ dependencies = [
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.51"
+version = "0.1.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -885,24 +978,24 @@ name = "redox_termios"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "redox_syscall 0.1.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex"
-version = "1.1.2"
+version = "1.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "aho-corasick 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aho-corasick 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.5"
+version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -913,7 +1006,7 @@ name = "remove_dir_all"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -925,13 +1018,13 @@ dependencies = [
  "glutin 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "shared_library 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "wio 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wio 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rustc-demangle"
-version = "0.1.13"
+version = "0.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -944,7 +1037,7 @@ dependencies = [
 
 [[package]]
 name = "rusttype"
-version = "0.7.5"
+version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "approx 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -985,7 +1078,7 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -998,23 +1091,25 @@ name = "smithay-client-toolkit"
 version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "andrew 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "andrew 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "dlib 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memmap 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-client 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-commons 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-protocols 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-client 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-commons 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-protocols 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "spirv_cross"
-version = "0.12.1"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.37 (registry+https://github.com/rust-lang/crates.io-index)",
+ "js-sys 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1040,36 +1135,36 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "0.15.29"
+version = "0.15.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "synstructure"
-version = "0.10.1"
+version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tempfile"
-version = "3.0.7"
+version = "3.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1082,11 +1177,12 @@ dependencies = [
 
 [[package]]
 name = "termion"
-version = "1.5.1"
+version = "1.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
+ "numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1129,17 +1225,65 @@ version = "2.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "same-file 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "wasm-bindgen-macro 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bumpalo 2.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-shared 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-macro-support 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-backend 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-shared 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "wayland-client"
 version = "0.12.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "token_store 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-scanner 0.12.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-sys 0.12.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1147,25 +1291,25 @@ dependencies = [
 
 [[package]]
 name = "wayland-client"
-version = "0.21.11"
+version = "0.21.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "downcast-rs 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
- "nix 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-commons 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-scanner 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-sys 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "downcast-rs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nix 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-commons 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-scanner 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-sys 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "wayland-commons"
-version = "0.21.11"
+version = "0.21.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nix 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-sys 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nix 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-sys 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1193,14 +1337,14 @@ dependencies = [
 
 [[package]]
 name = "wayland-protocols"
-version = "0.21.11"
+version = "0.21.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-client 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-commons 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-scanner 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-sys 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-client 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-commons 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-scanner 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-sys 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1213,11 +1357,11 @@ dependencies = [
 
 [[package]]
 name = "wayland-scanner"
-version = "0.21.11"
+version = "0.21.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "xml-rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1232,7 +1376,7 @@ dependencies = [
 
 [[package]]
 name = "wayland-sys"
-version = "0.21.11"
+version = "0.21.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dlib 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1245,14 +1389,14 @@ version = "0.13.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-client 0.12.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-protocols 0.12.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "winapi"
-version = "0.3.6"
+version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1269,7 +1413,7 @@ name = "winapi-util"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1282,7 +1426,7 @@ name = "wincolor"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1296,45 +1440,46 @@ dependencies = [
  "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 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-client 0.12.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-kbd 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-protocols 0.12.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-window 0.13.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "x11-dl 2.18.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "winit"
-version = "0.18.1"
+version = "0.19.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "android_glue 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "backtrace 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "cocoa 0.18.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "smithay-client-toolkit 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "wayland-client 0.21.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-client 0.21.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "x11-dl 2.18.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "wio"
-version = "0.2.0"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1342,7 +1487,7 @@ name = "x11"
 version = "2.18.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1352,7 +1497,7 @@ version = "2.18.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1361,7 +1506,7 @@ name = "xcb"
 version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1384,28 +1529,29 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [metadata]
-"checksum aho-corasick 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "81ce3d38065e618af2d7b77e10c5ad9a069859b4be3c2250f674af3840d9c8a5"
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diff --git a/libportability-gfx/Cargo.toml b/libportability-gfx/Cargo.toml
index fe6c46c..ba7cf6c 100644
--- a/libportability-gfx/Cargo.toml
+++ b/libportability-gfx/Cargo.toml
@@ -53,3 +53,8 @@ optional = true
 git = "https://github.com/gfx-rs/gfx"
 #path = "../../gfx/src/backend/metal"
 optional = true
+
+[dependencies.gfx-backend-gl]
+git = "https://github.com/gfx-rs/gfx"
+#path = "../../gfx/src/backend/gl"
+optional = true
diff --git a/libportability-gfx/src/impls.rs b/libportability-gfx/src/impls.rs
index 65d9f56..788ae35 100644
--- a/libportability-gfx/src/impls.rs
+++ b/libportability-gfx/src/impls.rs
@@ -9,6 +9,7 @@ use hal::device::WaitFor;
 use hal::pool::RawCommandPool;
 use hal::queue::RawCommandQueue;
 
+use std::borrow::Cow;
 #[cfg(feature = "gfx-backend-metal")]
 use std::env;
 use std::ffi::{CStr, CString};
@@ -387,13 +388,22 @@ pub extern "C" fn gfxGetPhysicalDeviceProperties(
         unsafe { mem::transmute(name) }
     };
 
+    use hal::adapter::DeviceType;
+    let device_type = match adapter.info.device_type {
+        DeviceType::IntegratedGpu => VkPhysicalDeviceType::VK_PHYSICAL_DEVICE_TYPE_INTEGRATED_GPU,
+        DeviceType::DiscreteGpu => VkPhysicalDeviceType::VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU,
+        DeviceType::VirtualGpu => VkPhysicalDeviceType::VK_PHYSICAL_DEVICE_TYPE_VIRTUAL_GPU,
+        DeviceType::Other => VkPhysicalDeviceType::VK_PHYSICAL_DEVICE_TYPE_OTHER,
+        DeviceType::Cpu => VkPhysicalDeviceType::VK_PHYSICAL_DEVICE_TYPE_CPU,
+    };
+
     unsafe {
         *pProperties = VkPhysicalDeviceProperties {
             apiVersion: (major << 22) | (minor << 12) | patch,
             driverVersion: DRIVER_VERSION,
             vendorID: adapter_info.vendor as _,
             deviceID: adapter_info.device as _,
-            deviceType: VkPhysicalDeviceType::VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU, // TODO
+            deviceType: device_type,
             deviceName: device_name,
             pipelineCacheUUID: [0; 16usize],
             limits,
@@ -1958,8 +1968,8 @@ pub extern "C" fn gfxCreateGraphicsPipelines(
                     entry: name.to_str().unwrap(),
                     module: &*stage.module,
                     specialization: pso::Specialization {
-                        constants: &spec_constants[cur_specialization .. cur_specialization + spec_count],
-                        data: &spec_data,
+                        constants: Cow::from(&spec_constants[cur_specialization .. cur_specialization + spec_count]),
+                        data: Cow::from(&spec_data),
                     },
                 };
                 cur_specialization += spec_count;
@@ -2349,8 +2359,8 @@ pub extern "C" fn gfxCreateComputePipelines(
                 entry: name.to_str().unwrap(),
                 module: &*info.stage.module,
                 specialization: pso::Specialization {
-                    constants: &spec_constants[cur_specialization .. cur_specialization + spec_count],
-                    data: &spec_data,
+                    constants: Cow::from(&spec_constants[cur_specialization .. cur_specialization + spec_count]),
+                    data: Cow::from(&spec_data),
                 },
             };
             cur_specialization += spec_count;
@@ -4290,19 +4300,14 @@ pub extern "C" fn gfxCreateSwapchainKHR(
         }
     }
 
-    let images = match backbuffers {
-        hal::Backbuffer::Images(images) => images
-            .into_iter()
-            .map(|raw| Handle::new(Image {
-                raw,
-                mip_levels: 1,
-                array_layers: 1,
-            }))
-            .collect(),
-        hal::Backbuffer::Framebuffer(_) => panic!(
-            "Expected backbuffer images. Backends returning only framebuffers are not supported!"
-        ),
-    };
+    let images = backbuffers
+        .into_iter()
+        .map(|raw| Handle::new(Image {
+            raw,
+            mip_levels: 1,
+            array_layers: 1,
+        }))
+        .collect();
 
     let swapchain = Swapchain {
         raw: Some(swapchain),
@@ -4579,16 +4584,21 @@ pub extern "C" fn gfxAcquireNextImageKHR(
         None => return VkResult::VK_ERROR_OUT_OF_DATE_KHR,
     };
 
+    use hal::device::OutOfMemory::{OutOfDeviceMemory, OutOfHostMemory};
+
     match unsafe {
         raw.acquire_image(timeout, semaphore.as_ref(), fence.as_ref())
     } {
         Ok(frame) => {
-            unsafe { *pImageIndex = frame; }
+            unsafe { *pImageIndex = frame.0; }
             VkResult::VK_SUCCESS
         }
         Err(hal::AcquireError::NotReady) => VkResult::VK_NOT_READY,
         Err(hal::AcquireError::OutOfDate) => VkResult::VK_ERROR_OUT_OF_DATE_KHR,
         Err(hal::AcquireError::SurfaceLost(_)) => VkResult::VK_ERROR_SURFACE_LOST_KHR,
+        Err(hal::AcquireError::DeviceLost(_)) => VkResult::VK_ERROR_DEVICE_LOST,
+        Err(hal::AcquireError::OutOfMemory(OutOfDeviceMemory)) => VkResult::VK_ERROR_OUT_OF_DEVICE_MEMORY,
+        Err(hal::AcquireError::OutOfMemory(OutOfHostMemory)) => VkResult::VK_ERROR_OUT_OF_HOST_MEMORY,
     }
 }
 #[inline]
diff --git a/libportability-gfx/src/lib.rs b/libportability-gfx/src/lib.rs
index fa4cbfe..c623e4e 100644
--- a/libportability-gfx/src/lib.rs
+++ b/libportability-gfx/src/lib.rs
@@ -13,6 +13,8 @@ extern crate gfx_backend_dx11 as back;
 extern crate gfx_backend_metal as back;
 #[cfg(feature = "gfx-backend-vulkan")]
 extern crate gfx_backend_vulkan as back;
+#[cfg(feature = "gfx-backend-gl")]
+extern crate gfx_backend_gl as back;
 
 extern crate copyless;
 #[macro_use]
diff --git a/libportability-icd/Cargo.toml b/libportability-icd/Cargo.toml
index 0891a52..1095114 100644
--- a/libportability-icd/Cargo.toml
+++ b/libportability-icd/Cargo.toml
@@ -17,6 +17,7 @@ dx12 = ["portability-gfx/gfx-backend-dx12"]
 dx11 = ["portability-gfx/gfx-backend-dx11"]
 metal = ["portability-gfx/gfx-backend-metal"]
 vulkan = ["portability-gfx/gfx-backend-vulkan"]
+gl = ["portability-gfx/gfx-backend-gl"]
 
 [dependencies]
 portability-gfx = { path = "../libportability-gfx", features = ["dispatch"] }
diff --git a/libportability-icd/portability-linux-debug.json b/libportability-icd/portability-linux-debug.json
new file mode 100644
index 0000000..9a05e8b
--- /dev/null
+++ b/libportability-icd/portability-linux-debug.json
@@ -0,0 +1,7 @@
+{
+   "file_format_version": "1.0.0",
+   "ICD": {
+      "library_path": "../target/debug/libportability_icd.so",
+      "api_version": "1.0.0"
+   }
+}
diff --git a/libportability/Cargo.toml b/libportability/Cargo.toml
index 863bea4..a25aac3 100644
--- a/libportability/Cargo.toml
+++ b/libportability/Cargo.toml
@@ -18,6 +18,7 @@ dx12 = ["portability-gfx/gfx-backend-dx12"]
 dx11 = ["portability-gfx/gfx-backend-dx11"]
 metal = ["portability-gfx/gfx-backend-metal"]
 vulkan = ["portability-gfx/gfx-backend-vulkan"]
+gl = ["portability-gfx/gfx-backend-gl"]
 
 [dependencies]
 portability-gfx = { path = "../libportability-gfx" }