diff --git a/Cargo.lock b/Cargo.lock
index fad1216..aa9c428 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,9 +1,9 @@
 [[package]]
 name = "aho-corasick"
-version = "0.6.9"
+version = "0.6.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -45,7 +45,7 @@ name = "ash"
 version = "0.27.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "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)",
 ]
 
@@ -54,7 +54,7 @@ name = "atty"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
 ]
@@ -66,13 +66,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "backtrace"
-version = "0.3.13"
+version = "0.3.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "autocfg 0.1.2 (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 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
 ]
@@ -82,8 +82,8 @@ name = "backtrace-sys"
 version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -103,7 +103,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cc"
-version = "1.0.29"
+version = "1.0.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -116,8 +116,8 @@ name = "cgl"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gleam 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -136,7 +136,7 @@ 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 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -150,7 +150,7 @@ dependencies = [
  "core-foundation 0.6.3 (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)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -160,7 +160,7 @@ 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 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -169,7 +169,7 @@ version = "0.6.3"
 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 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -177,7 +177,7 @@ name = "core-foundation-sys"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -193,7 +193,7 @@ 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 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -204,7 +204,7 @@ 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)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -223,7 +223,7 @@ 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 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -247,7 +247,7 @@ 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 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -256,7 +256,7 @@ name = "failure"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -267,7 +267,7 @@ 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 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -305,7 +305,7 @@ 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#f1ad3182a05c01ea38182337a97b7d0676fc527f"
+source = "git+https://github.com/gfx-rs/gfx#8e3864bce2f21fb39676ab068b3bf2651a4db4f4"
 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)",
@@ -313,7 +313,7 @@ dependencies = [
  "log 0.4.6 (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 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "spirv_cross 0.12.1 (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)",
@@ -323,7 +323,7 @@ dependencies = [
 [[package]]
 name = "gfx-backend-dx12"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#f1ad3182a05c01ea38182337a97b7d0676fc527f"
+source = "git+https://github.com/gfx-rs/gfx#8e3864bce2f21fb39676ab068b3bf2651a4db4f4"
 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)",
@@ -331,7 +331,7 @@ dependencies = [
  "gfx-hal 0.1.0 (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 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "spirv_cross 0.12.1 (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)",
@@ -340,7 +340,7 @@ dependencies = [
 [[package]]
 name = "gfx-backend-metal"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#f1ad3182a05c01ea38182337a97b7d0676fc527f"
+source = "git+https://github.com/gfx-rs/gfx#8e3864bce2f21fb39676ab068b3bf2651a4db4f4"
 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)",
@@ -353,7 +353,7 @@ dependencies = [
  "objc 0.2.5 (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 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "spirv_cross 0.12.1 (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)",
@@ -362,14 +362,14 @@ dependencies = [
 [[package]]
 name = "gfx-backend-vulkan"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#f1ad3182a05c01ea38182337a97b7d0676fc527f"
+source = "git+https://github.com/gfx-rs/gfx#8e3864bce2f21fb39676ab068b3bf2651a4db4f4"
 dependencies = [
  "ash 0.27.1 (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)",
- "lazy_static 1.2.0 (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)",
- "smallvec 0.6.8 (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)",
  "x11 2.18.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -379,7 +379,7 @@ dependencies = [
 [[package]]
 name = "gfx-hal"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#f1ad3182a05c01ea38182337a97b7d0676fc527f"
+source = "git+https://github.com/gfx-rs/gfx#8e3864bce2f21fb39676ab068b3bf2651a4db4f4"
 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)",
@@ -408,7 +408,7 @@ dependencies = [
 
 [[package]]
 name = "gleam"
-version = "0.6.8"
+version = "0.6.11"
 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)",
@@ -425,8 +425,8 @@ 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)",
  "gl_generator 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.5 (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)",
@@ -461,12 +461,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lazy_static"
-version = "1.2.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.48"
+version = "0.2.49"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -474,7 +474,7 @@ name = "libloading"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -508,24 +508,20 @@ name = "malloc_buf"
 version = "0.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "memchr"
-version = "2.1.3"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "memmap"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -534,7 +530,7 @@ name = "memmap"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -548,7 +544,7 @@ 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 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc-foundation 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -561,9 +557,9 @@ 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 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -659,10 +655,10 @@ name = "parking_lot_core"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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 0.6.8 (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)",
 ]
 
@@ -671,10 +667,10 @@ name = "parking_lot_core"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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 0.6.8 (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)",
 ]
 
@@ -705,7 +701,7 @@ 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 1.2.0 (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)",
  "renderdoc 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -745,7 +741,7 @@ 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 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
 ]
@@ -756,14 +752,14 @@ 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 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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_os 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_pcg 0.1.1 (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)",
 ]
@@ -811,7 +807,7 @@ name = "rand_jitter"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
 ]
@@ -823,7 +819,7 @@ 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 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
@@ -831,11 +827,11 @@ dependencies = [
 
 [[package]]
 name = "rand_pcg"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -849,7 +845,7 @@ dependencies = [
 [[package]]
 name = "range-alloc"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#f1ad3182a05c01ea38182337a97b7d0676fc527f"
+source = "git+https://github.com/gfx-rs/gfx#8e3864bce2f21fb39676ab068b3bf2651a4db4f4"
 
 [[package]]
 name = "rdrand"
@@ -874,11 +870,11 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.1.0"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aho-corasick 0.6.10 (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)",
  "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)",
@@ -968,17 +964,14 @@ name = "shared_library"
 version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "smallvec"
-version = "0.6.8"
+version = "0.6.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "smithay-client-toolkit"
@@ -988,7 +981,7 @@ dependencies = [
  "andrew 0.1.6 (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 1.2.0 (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 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1002,7 +995,7 @@ name = "spirv_cross"
 version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1028,7 +1021,7 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "0.15.26"
+version = "0.15.27"
 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)",
@@ -1043,17 +1036,17 @@ 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 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.27 (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 = "3.0.6"
+version = "3.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1073,7 +1066,7 @@ name = "termion"
 version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1083,7 +1076,7 @@ name = "thread_local"
 version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1101,14 +1094,6 @@ name = "unicode-xid"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "unreachable"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "utf8-ranges"
 version = "1.0.2"
@@ -1135,7 +1120,7 @@ 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 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
@@ -1148,7 +1133,7 @@ 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 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
@@ -1171,7 +1156,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "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 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wayland-client 0.12.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1223,7 +1208,7 @@ 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 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1232,7 +1217,7 @@ version = "0.21.11"
 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 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1241,7 +1226,7 @@ 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 3.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.7 (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)",
 ]
@@ -1291,8 +1276,8 @@ 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 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.5 (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)",
@@ -1309,12 +1294,12 @@ version = "0.18.1"
 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 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.14 (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-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "objc 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1338,7 +1323,7 @@ name = "x11"
 version = "2.18.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1347,8 +1332,8 @@ name = "x11-dl"
 version = "2.18.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1357,7 +1342,7 @@ name = "xcb"
 version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1380,7 +1365,7 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [metadata]
-"checksum aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1e9a933f4e58658d7b12defcf96dc5c720f20832deebe3e0a19efd3b6aaeeb9e"
+"checksum aho-corasick 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "81ce3d38065e618af2d7b77e10c5ad9a069859b4be3c2250f674af3840d9c8a5"
 "checksum andrew 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "142e9e6a99ad0d63a4cf6ce58a4c979f472c5815cbf7e5ca4e47b26a10dc728e"
 "checksum android_glue 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "000444226fcff248f2bc4c7625be32c63caccfecc2723a2b9f78a7487a49c407"
 "checksum approx 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3c57ff1a5b00753647aebbbcf4ea67fa1e711a65ea7a30eb90dbf07de2485aee"
@@ -1388,12 +1373,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum ash 0.27.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6bdd92aa1f43b5a24230055edecf223b51c769903315c94a6fbef6445d4ace50"
 "checksum atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "9a7d5b8723950951411ee34d271d99dddcc2035a16ab25310ea2c8cfd4369652"
 "checksum autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a6d640bee2da49f60a4068a7fae53acde8982514ab7bae8b8cea9e88cbcfd799"
-"checksum backtrace 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)" = "b5b493b66e03090ebc4343eb02f94ff944e0cbc9ac6571491d170ba026741eb5"
+"checksum backtrace 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "cd5a90e2b463010cd0e0ce9a11d4a9d5d58d9f41d4a6ba3dcaf9e68b466e88b4"
 "checksum backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)" = "797c830ac25ccc92a7f8a7b9862bde440715531514594a6154e3d4a54dd769b6"
 "checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
 "checksum block 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0d8c1fef690941d3e7788d328517591fecc684c084084702d6ff1641e993699a"
 "checksum byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a019b10a2a7cdeb292db131fc8113e57ea2a908f6e7894b0c3c671893b65dbeb"
-"checksum cc 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)" = "4390a3b5f4f6bce9c1d0c00128379df433e53777fdd30e92f16a529332baec4e"
+"checksum cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)" = "d01c69d08ff207f231f07196e30f84c70f1c815b04f980f8b7b01ff01f05eb92"
 "checksum cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "082bb9b28e00d3c9d39cc03e64ce4cea0f1bb9b3fde493f0cbc008472d22bdf4"
 "checksum cgl 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "55e7ec0b74fe5897894cbc207092c577e87c52f8a59e8ca8d97ef37551f60a49"
 "checksum cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
@@ -1424,20 +1409,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum gfx-hal 0.1.0 (git+https://github.com/gfx-rs/gfx)" = "<none>"
 "checksum gl_generator 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a0ffaf173cf76c73a73e080366bf556b4776ece104b06961766ff11449f38604"
 "checksum gl_generator 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a795170cbd85b5a7baa58d6d7525cae6a03e486859860c220f7ebbbdd379d0a"
-"checksum gleam 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)" = "4b47f5b15742aee359c7895ab98cf2cceecc89bb4feb6f4e42f802d7899877da"
+"checksum gleam 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)" = "b93018064928ec67c429c9c9416affd93660419dbf84767fff6b8a99fbe9c277"
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 "checksum range-alloc 0.1.0 (git+https://github.com/gfx-rs/gfx)" = "<none>"
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-"checksum regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "37e7cbbd370869ce2e8dff25c7018702d10b21a20ef7135316f8daecd6c25b7f"
+"checksum regex 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "53ee8cfdddb2e0291adfb9f13d31d3bbe0a03c9a402c01b1e24188d86c35b24f"
 "checksum regex-syntax 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "8c2f35eedad5295fdf00a63d7d4b238135723f92b434ec06774dad15c7ab0861"
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@@ -1487,22 +1472,21 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
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diff --git a/libportability-gfx/src/conv.rs b/libportability-gfx/src/conv.rs
index 13dead8..9cff8f6 100644
--- a/libportability-gfx/src/conv.rs
+++ b/libportability-gfx/src/conv.rs
@@ -18,6 +18,7 @@ pub fn limits_from_hal(limits: Limits) -> VkPhysicalDeviceLimits {
         maxTessellationPatchSize: limits.max_patch_size as _,
         maxPushConstantsSize: 0x80, //TODO
         maxViewports: limits.max_viewports as _,
+        maxViewportDimensions: [limits.max_texture_size as u32; 2],
         maxVertexInputAttributes: limits.max_vertex_input_attributes as _,
         maxVertexInputBindings: limits.max_vertex_input_bindings as _,
         maxVertexInputAttributeOffset: limits.max_vertex_input_attribute_offset as _,
diff --git a/libportability-gfx/src/impls.rs b/libportability-gfx/src/impls.rs
index 42769dc..10792d0 100644
--- a/libportability-gfx/src/impls.rs
+++ b/libportability-gfx/src/impls.rs
@@ -188,9 +188,9 @@ pub extern "C" fn gfxGetPhysicalDeviceQueueFamilyProperties(
             queueCount: family.max_queues() as _,
             timestampValidBits: 0, //TODO
             minImageTransferGranularity: VkExtent3D {
-                width: 0,
-                height: 0,
-                depth: 0,
+                width: 1,
+                height: 1,
+                depth: 1,
             }, //TODO
         }
     }
@@ -1058,33 +1058,58 @@ pub extern "C" fn gfxQueueSubmit(
     pSubmits: *const VkSubmitInfo,
     fence: VkFence,
 ) -> VkResult {
-    assert_eq!(submitCount, 1); // TODO;
-
-    let submission = unsafe { *pSubmits };
-    let cmd_slice = unsafe {
-        slice::from_raw_parts(submission.pCommandBuffers, submission.commandBufferCount as _)
+    let submits = unsafe {
+        slice::from_raw_parts(pSubmits, submitCount as usize)
     };
-    let wait_semaphores = unsafe {
-        let semaphores = slice::from_raw_parts(submission.pWaitSemaphores, submission.waitSemaphoreCount as _);
-        let stages = slice::from_raw_parts(submission.pWaitDstStageMask, submission.waitSemaphoreCount as _);
+    for (i, submission) in submits.iter().enumerate() {
+        let cmd_slice = unsafe {
+            slice::from_raw_parts(submission.pCommandBuffers, submission.commandBufferCount as _)
+        };
+        let wait_semaphores = unsafe {
+            let semaphores = slice::from_raw_parts(submission.pWaitSemaphores, submission.waitSemaphoreCount as _);
+            let stages = slice::from_raw_parts(submission.pWaitDstStageMask, submission.waitSemaphoreCount as _);
 
-        stages.into_iter()
-            .zip(semaphores)
-            .map(|(stage, semaphore)| (&**semaphore, conv::map_pipeline_stage_flags(*stage)))
-    };
-    let signal_semaphores = unsafe {
-        slice::from_raw_parts(submission.pSignalSemaphores, submission.signalSemaphoreCount as _)
-            .into_iter()
-            .map(|semaphore| &**semaphore)
-    };
+            stages.into_iter()
+                .zip(semaphores)
+                .map(|(stage, semaphore)| (&**semaphore, conv::map_pipeline_stage_flags(*stage)))
+        };
+        let signal_semaphores = unsafe {
+            slice::from_raw_parts(submission.pSignalSemaphores, submission.signalSemaphoreCount as _)
+                .into_iter()
+                .map(|semaphore| &**semaphore)
+        };
 
-    let submission = hal::queue::Submission {
-        command_buffers: cmd_slice.iter(),
-        wait_semaphores,
-        signal_semaphores,
-    };
+        let submission = hal::queue::Submission {
+            command_buffers: cmd_slice.iter(),
+            wait_semaphores,
+            signal_semaphores,
+        };
 
-    unsafe { queue.submit(submission, fence.as_ref()); }
+        // only provide the fence for the last submission
+        //TODO: support multiple submissions at gfx-hal level
+        let fence = if i + 1 == submits.len() {
+            fence.as_ref()
+        } else {
+            None
+        };
+        unsafe { queue.submit(submission, fence); }
+    }
+
+    // sometimes, all you need is a fence...
+    if submits.is_empty() {
+        use std::iter::empty;
+        let submission = hal::queue::Submission {
+            command_buffers: empty(),
+            wait_semaphores: empty(),
+            signal_semaphores: empty(),
+        };
+        unsafe {
+            queue.submit::<VkCommandBuffer, _, VkSemaphore, _, _>(
+                submission,
+                fence.as_ref(),
+            )
+        };
+    }
 
     VkResult::VK_SUCCESS
 }
@@ -1384,21 +1409,29 @@ pub extern "C" fn gfxWaitForFences(
     waitAll: VkBool32,
     timeout: u64,
 ) -> VkResult {
-    let fence_slice = unsafe {
-        slice::from_raw_parts(pFences, fenceCount as _)
-    };
-    let fences = fence_slice
-        .into_iter()
-        .map(|fence| &**fence);
-
-    let wait_for = match waitAll {
-        VK_FALSE => WaitFor::Any,
-        _ => WaitFor::All,
+    let result = match fenceCount {
+        0 => Ok(true),
+        1 => unsafe {
+            gpu.device.wait_for_fence(&**pFences, timeout)
+        },
+        _ => {
+            let fence_slice = unsafe {
+                slice::from_raw_parts(pFences, fenceCount as _)
+            };
+            let fences = fence_slice
+                .into_iter()
+                .map(|fence| &**fence);
+            let wait_for = match waitAll {
+                VK_FALSE => WaitFor::Any,
+                _ => WaitFor::All,
+            };
+            unsafe {
+                gpu.device.wait_for_fences(fences, wait_for, timeout)
+            }
+        }
     };
 
-    match unsafe {
-        gpu.device.wait_for_fences(fences, wait_for, timeout as _)
-    } {
+    match result {
         Ok(true) => VkResult::VK_SUCCESS,
         Ok(false) => VkResult::VK_TIMEOUT,
         Err(hal::device::OomOrDeviceLost::OutOfMemory(oom)) => map_oom(oom),
@@ -1972,8 +2005,8 @@ pub extern "C" fn gfxCreateGraphicsPipelines(
                 .iter()
                 .map(|binding| {
                     let rate = match binding.inputRate {
-                        VkVertexInputRate::VK_VERTEX_INPUT_RATE_VERTEX => 0,
-                        VkVertexInputRate::VK_VERTEX_INPUT_RATE_INSTANCE => 1,
+                        VkVertexInputRate::VK_VERTEX_INPUT_RATE_VERTEX => pso::VertexInputRate::Vertex,
+                        VkVertexInputRate::VK_VERTEX_INPUT_RATE_INSTANCE => pso::VertexInputRate::Instance(1),
                         rate => panic!("Unexpected input rate: {:?}", rate),
                     };
 
@@ -2588,7 +2621,11 @@ pub extern "C" fn gfxCreateDescriptorPool(
 
     let pool = super::DescriptorPool {
         raw: match unsafe {
-            gpu.device.create_descriptor_pool(max_sets, ranges)
+            gpu.device.create_descriptor_pool(
+                max_sets,
+                ranges,
+                pso::DescriptorPoolCreateFlags::from_bits_truncate(info.flags),
+            )
         } {
             Ok(pool) => pool,
             Err(oom) => return map_oom(oom),