From 6ef53d7705ec2cbdaf804ce13ce1c89bc4f41b86 Mon Sep 17 00:00:00 2001
From: Tristam MacDonald <tristam@trist.am>
Date: Fri, 1 Mar 2019 20:58:28 -0800
Subject: [PATCH] Convert shadow sample to map_async

---
 .gitignore                          |   1 +
 Cargo.lock                          | 364 ++++++++++++++--------------
 examples/hello_compute_rust/main.rs |  28 +--
 gfx-examples/src/cube.rs            |  74 ++----
 gfx-examples/src/shadow.rs          | 132 +++++-----
 wgpu-native/src/device.rs           |  54 +++--
 wgpu-native/src/resource.rs         |   1 +
 wgpu-rs/src/lib.rs                  |  34 ++-
 8 files changed, 359 insertions(+), 329 deletions(-)

diff --git a/.gitignore b/.gitignore
index 621da21d8..b7894bfb6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@
 **/*.rs.bk
 #Cargo.lock
 .vscode
+.vs
 build
diff --git a/Cargo.lock b/Cargo.lock
index bae74424b..a91d5b151 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,10 +2,10 @@
 # It is not intended for manual editing.
 [[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]]
@@ -15,7 +15,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "line_drawing 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rusttype 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rusttype 0.7.5 (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)",
@@ -61,7 +61,7 @@ version = "0.24.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "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)",
  "shared_library 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -70,7 +70,7 @@ 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)",
 ]
@@ -82,13 +82,13 @@ 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)",
+ "cfg-if 0.1.7 (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)",
 ]
@@ -98,18 +98,18 @@ name = "backtrace-sys"
 version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.28 (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]]
 name = "bincode"
-version = "1.1.1"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -148,22 +148,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.58 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.37 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cc"
-version = "1.0.28"
+version = "1.0.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.6"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -173,7 +173,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "approx 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -203,7 +203,7 @@ name = "cmake"
 version = "0.1.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -216,7 +216,7 @@ 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)",
 ]
 
@@ -226,7 +226,7 @@ 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]]
@@ -242,7 +242,7 @@ 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]]
@@ -251,7 +251,7 @@ version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-utils 0.6.5 (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)",
 ]
 
 [[package]]
@@ -259,8 +259,8 @@ name = "crossbeam-utils"
 version = "0.6.5"
 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)",
- "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -277,9 +277,9 @@ name = "derivative"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "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]]
@@ -311,7 +311,7 @@ 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)",
 ]
 
@@ -329,7 +329,7 @@ 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)",
 ]
 
@@ -338,9 +338,9 @@ name = "failure_derive"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "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)",
 ]
 
@@ -367,6 +367,11 @@ name = "foreign-types-shared"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "fuchsia-cprng"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fuchsia-zircon"
 version = "0.3.3"
@@ -413,7 +418,7 @@ 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 (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)",
  "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)",
@@ -422,7 +427,7 @@ dependencies = [
 
 [[package]]
 name = "gfx-backend-dx12"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -431,7 +436,7 @@ dependencies = [
  "gfx-hal 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "range-alloc 0.1.0 (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)",
  "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)",
@@ -462,7 +467,7 @@ 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 (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)",
  "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)",
@@ -476,9 +481,9 @@ dependencies = [
  "ash 0.24.4 (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 (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)",
  "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)",
@@ -513,7 +518,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cmake 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha2 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -529,24 +534,24 @@ name = "iovec"
 version = "0.1.2"
 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 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "ipc-channel"
-version = "0.11.2"
+version = "0.11.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bincode 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bincode 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (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)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "uuid 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -571,7 +576,7 @@ 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]]
@@ -581,7 +586,7 @@ 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]]
@@ -589,7 +594,7 @@ name = "libloading"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.28 (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)",
 ]
 
@@ -615,7 +620,7 @@ name = "log"
 version = "0.4.6"
 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)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -623,24 +628,20 @@ 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 = "0.7.0"
 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)",
 ]
 
@@ -654,7 +655,7 @@ 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)",
@@ -671,7 +672,7 @@ dependencies = [
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazycell 1.2.1 (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)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -695,8 +696,8 @@ name = "net2"
 version = "0.2.33"
 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)",
+ "cfg-if 0.1.7 (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)",
 ]
 
@@ -706,9 +707,9 @@ 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 1.0.28 (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)",
+ "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -796,10 +797,10 @@ 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)",
- "rand 0.5.5 (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)",
 ]
 
@@ -808,10 +809,10 @@ 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)",
- "rand 0.6.4 (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)",
 ]
 
@@ -835,7 +836,7 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.26"
+version = "0.4.27"
 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)",
@@ -859,34 +860,35 @@ name = "quote"
 version = "0.6.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand"
-version = "0.5.5"
+version = "0.5.6"
 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-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
 ]
 
 [[package]]
 name = "rand"
-version = "0.6.4"
+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 0.3.0 (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_os 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_pcg 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 0.1.2 (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)",
 ]
@@ -897,20 +899,20 @@ 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)",
- "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand_core"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand_core"
-version = "0.3.0"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -918,7 +920,7 @@ name = "rand_hc"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -926,29 +928,39 @@ name = "rand_isaac"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_jitter"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "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)",
 ]
 
 [[package]]
 name = "rand_os"
-version = "0.1.1"
+version = "0.1.2"
 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-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
 ]
 
 [[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 0.3.0 (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]]
@@ -956,7 +968,7 @@ name = "rand_xorshift"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -969,7 +981,7 @@ name = "rdrand"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -987,11 +999,11 @@ 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)",
@@ -1028,13 +1040,13 @@ dependencies = [
 
 [[package]]
 name = "rusttype"
-version = "0.7.3"
+version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "approx 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "ordered-float 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "stb_truetype 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "stb_truetype 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1047,7 +1059,7 @@ name = "same-file"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1070,7 +1082,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.85"
+version = "1.0.89"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "serde_derive 1.0.58 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1088,12 +1100,12 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.37"
+version = "1.0.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1112,8 +1124,8 @@ 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]]
@@ -1123,11 +1135,8 @@ source = "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"
@@ -1137,10 +1146,10 @@ 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 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.5 (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)",
@@ -1151,7 +1160,7 @@ name = "spirv_cross"
 version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1161,7 +1170,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "stb_truetype"
-version = "0.2.5"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1192,10 +1201,10 @@ 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 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "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)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1205,20 +1214,20 @@ name = "synstructure"
 version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "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 = "3.0.5"
+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)",
- "rand 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.49 (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)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1237,7 +1246,7 @@ 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)",
 ]
@@ -1255,7 +1264,7 @@ 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]]
@@ -1263,7 +1272,7 @@ name = "toml"
 version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1286,14 +1295,6 @@ 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"
@@ -1304,7 +1305,7 @@ name = "uuid"
 version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1324,7 +1325,7 @@ 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-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1334,7 +1335,7 @@ 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)",
@@ -1367,7 +1368,7 @@ name = "wayland-scanner"
 version = "0.21.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "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)",
  "xml-rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -1378,7 +1379,7 @@ 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]]
@@ -1403,15 +1404,15 @@ dependencies = [
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- "gfx-backend-dx12 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gfx-backend-dx12 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
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- "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)",
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  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -1420,10 +1421,10 @@ dependencies = [
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 version = "0.1.0"
 dependencies = [
- "ipc-channel 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "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)",
- "serde 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
  "wgpu-native 0.1.0",
 ]
 
@@ -1453,7 +1454,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
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-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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@@ -1470,7 +1471,7 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1479,12 +1480,12 @@ 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)",
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- "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)",
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@@ -1517,7 +1518,7 @@ name = "x11"
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 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)",
 ]
 
@@ -1526,8 +1527,8 @@ name = "x11-dl"
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 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)",
 ]
 
@@ -1536,7 +1537,7 @@ name = "xcb"
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 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)",
 ]
 
@@ -1551,7 +1552,7 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
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@@ -1561,17 +1562,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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 "checksum cgmath 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)" = "283944cdecc44bf0b8dd010ec9af888d3b4f142844fdbe026c20ef68148d6fe7"
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@@ -1594,13 +1595,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
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@@ -1608,19 +1610,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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 "checksum synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "73687139bf99285483c96ac0add482c3776528beac1d97d444f6e91f203a2015"
-"checksum tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "7e91405c14320e5c79b3d148e1c86f40749a36e490642202a31689cb1a3452b2"
+"checksum tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "b86c784c88d98c801132806dadd3819ed29d8600836c4088e855cdf3e178ed8a"
 "checksum termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4096add70612622289f2fdcdbd5086dc81c1e2675e6ae58d6c4f62a16c6d7f2f"
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@@ -1697,7 +1700,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
 "checksum unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "882386231c45df4700b275c7ff55b6f3698780a650026380e72dabe76fa46526"
 "checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
-"checksum unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
 "checksum utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "796f7e48bef87609f7ade7e06495a87d5cd06c7866e6a5cbfceffc558a243737"
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@@ -1712,7 +1714,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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-"checksum winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "afc5508759c5bf4285e61feb862b6083c8480aec864fa17a81fdec6f69b461ab"
+"checksum winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7168bab6e1daee33b4557efd0e95d5ca70a03706d39fa5f3fe7a236f584b03c9"
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 "checksum winit 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c57c15bd4c0ef18dff33e263e452abe32d00e2e05771cacaa410a14cc1c0776"
diff --git a/examples/hello_compute_rust/main.rs b/examples/hello_compute_rust/main.rs
index 7761828e3..ef5bdef87 100644
--- a/examples/hello_compute_rust/main.rs
+++ b/examples/hello_compute_rust/main.rs
@@ -4,14 +4,6 @@ extern crate wgpu_native;
 
 use std::str::FromStr;
 
-// TODO: deduplicate this with the copy in gfx-examples/framework
-pub fn cast_slice<T>(data: &[T]) -> &[u8] {
-    use std::mem::size_of;
-    use std::slice::from_raw_parts;
-
-    unsafe { from_raw_parts(data.as_ptr() as *const u8, data.len() * size_of::<T>()) }
-}
-
 fn main() {
     env_logger::init();
 
@@ -39,16 +31,17 @@ fn main() {
     let cs_bytes = include_bytes!("./../data/collatz.comp.spv");
     let cs_module = device.create_shader_module(cs_bytes);
 
-    let staging_buffer = device.create_buffer(&wgpu::BufferDescriptor {
-        size,
-        usage: wgpu::BufferUsageFlags::MAP_READ
-            | wgpu::BufferUsageFlags::TRANSFER_DST
-            | wgpu::BufferUsageFlags::TRANSFER_SRC,
-    });
-    staging_buffer.set_sub_data(0, cast_slice(&numbers));
+    let staging_buffer = device
+        .create_buffer_mapped(
+            numbers.len(),
+            wgpu::BufferUsageFlags::MAP_READ
+                | wgpu::BufferUsageFlags::TRANSFER_DST
+                | wgpu::BufferUsageFlags::TRANSFER_SRC,
+        )
+        .fill_from_slice(&numbers);
 
     let storage_buffer = device.create_buffer(&wgpu::BufferDescriptor {
-        size: (numbers.len() * std::mem::size_of::<u32>()) as u32,
+        size,
         usage: wgpu::BufferUsageFlags::STORAGE
             | wgpu::BufferUsageFlags::TRANSFER_DST
             | wgpu::BufferUsageFlags::TRANSFER_SRC,
@@ -68,7 +61,7 @@ fn main() {
             binding: 0,
             resource: wgpu::BindingResource::Buffer {
                 buffer: &storage_buffer,
-                range: 0..(numbers.len() as u32),
+                range: 0..size,
             },
         }],
     });
@@ -95,7 +88,6 @@ fn main() {
     }
     encoder.copy_buffer_to_buffer(&storage_buffer, 0, &staging_buffer, 0, size);
 
-
     staging_buffer.map_read_async(0, size, |result: wgpu::BufferMapAsyncResult<&[u32]>| {
         if let wgpu::BufferMapAsyncResult::Success(data) = result {
             println!("Times: {:?}", data);
diff --git a/gfx-examples/src/cube.rs b/gfx-examples/src/cube.rs
index 8d84e4407..cd9e5ea3e 100644
--- a/gfx-examples/src/cube.rs
+++ b/gfx-examples/src/cube.rs
@@ -3,14 +3,14 @@ mod framework;
 
 #[derive(Clone, Copy)]
 struct Vertex {
-    pos: [f32; 4],
-    tex_coord: [f32; 2],
+    _pos: [f32; 4],
+    _tex_coord: [f32; 2],
 }
 
 fn vertex(pos: [i8; 3], tc: [i8; 2]) -> Vertex {
     Vertex {
-        pos: [pos[0] as f32, pos[1] as f32, pos[2] as f32, 1.0],
-        tex_coord: [tc[0] as f32, tc[1] as f32],
+        _pos: [pos[0] as f32, pos[1] as f32, pos[2] as f32, 1.0],
+        _tex_coord: [tc[0] as f32, tc[1] as f32],
     }
 }
 
@@ -115,27 +115,13 @@ impl framework::Example for Example {
         // Create the vertex and index buffers
         let vertex_size = mem::size_of::<Vertex>();
         let (vertex_data, index_data) = create_vertices();
-        let vertex_buffer_length = vertex_data.len() * vertex_size;
-        let index_buffer_length = index_data.len() * mem::size_of::<u16>();
-        let vertex_buf = {
-            let (vertex_buf, vertex_buf_data) = device.create_buffer_mapped(&wgpu::BufferDescriptor {
-                size: vertex_buffer_length as u32,
-                usage: wgpu::BufferUsageFlags::VERTEX | wgpu::BufferUsageFlags::TRANSFER_DST | wgpu::BufferUsageFlags::MAP_WRITE,
-            });
-            vertex_buf_data.copy_from_slice(&vertex_data);
-            vertex_buf.unmap();
-            vertex_buf
-        };
+        let vertex_buf =
+            device.create_buffer_mapped(vertex_data.len(), wgpu::BufferUsageFlags::VERTEX)
+            .fill_from_slice(&vertex_data);
 
-        let index_buf = {
-            let (index_buf, index_buf_data) = device.create_buffer_mapped(&wgpu::BufferDescriptor {
-                size: index_buffer_length as u32,
-                usage: wgpu::BufferUsageFlags::INDEX | wgpu::BufferUsageFlags::TRANSFER_DST | wgpu::BufferUsageFlags::MAP_WRITE,
-            });
-            index_buf_data.copy_from_slice(&index_data);
-            index_buf.unmap();
-            index_buf
-        };
+        let index_buf =
+            device.create_buffer_mapped(index_data.len(), wgpu::BufferUsageFlags::INDEX)
+            .fill_from_slice(&index_data);
 
         // Create pipeline layout
         let bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
@@ -177,15 +163,9 @@ impl framework::Example for Example {
             usage: wgpu::TextureUsageFlags::SAMPLED | wgpu::TextureUsageFlags::TRANSFER_DST,
         });
         let texture_view = texture.create_default_view();
-        let temp_buf = {
-            let (temp_buf, temp_buf_data) = device.create_buffer_mapped(&wgpu::BufferDescriptor {
-                size: texels.len() as u32,
-                usage: wgpu::BufferUsageFlags::TRANSFER_SRC | wgpu::BufferUsageFlags::TRANSFER_DST | wgpu::BufferUsageFlags::MAP_WRITE,
-            });
-            temp_buf_data.copy_from_slice(&texels);
-            temp_buf.unmap();
-            temp_buf
-        };
+        let temp_buf =
+            device.create_buffer_mapped(texels.len(), wgpu::BufferUsageFlags::TRANSFER_SRC)
+            .fill_from_slice(&texels);
         init_encoder.copy_buffer_to_texture(
             wgpu::BufferCopyView {
                 buffer: &temp_buf,
@@ -222,15 +202,9 @@ impl framework::Example for Example {
         });
         let mx_total = Self::generate_matrix(sc_desc.width as f32 / sc_desc.height as f32);
         let mx_ref: &[f32; 16] = mx_total.as_ref();
-        let uniform_buf = {
-            let (uniform_buf, uniform_buf_data) = device.create_buffer_mapped(&wgpu::BufferDescriptor {
-                size: 64,
-                usage: wgpu::BufferUsageFlags::UNIFORM | wgpu::BufferUsageFlags::TRANSFER_DST | wgpu::BufferUsageFlags::MAP_WRITE,
-            });
-            uniform_buf_data.copy_from_slice(mx_ref);
-            uniform_buf.unmap();
-            uniform_buf
-        };
+        let uniform_buf =
+            device.create_buffer_mapped(16, wgpu::BufferUsageFlags::UNIFORM | wgpu::BufferUsageFlags::TRANSFER_DST)
+            .fill_from_slice(mx_ref);
 
         // Create bind group
         let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
@@ -326,17 +300,17 @@ impl framework::Example for Example {
         //empty
     }
 
-    fn resize(&mut self, sc_desc: &wgpu::SwapChainDescriptor, _device: &mut wgpu::Device) {
+    fn resize(&mut self, sc_desc: &wgpu::SwapChainDescriptor, device: &mut wgpu::Device) {
         let mx_total = Self::generate_matrix(sc_desc.width as f32 / sc_desc.height as f32);
         let mx_ref: &[f32; 16] = mx_total.as_ref();
-        // self.uniform_buf.set_sub_data(0, framework::cast_slice(&mx_ref[..]));
-        self.uniform_buf.map_write_async(0, 64, |result: wgpu::BufferMapAsyncResult<&mut [f32]>| {
-            if let wgpu::BufferMapAsyncResult::Success(data) = result {
-                data.copy_from_slice(mx_ref);
-            }
 
-            self.uniform_buf.unmap();
-        });
+        let temp_buf =
+            device.create_buffer_mapped(16, wgpu::BufferUsageFlags::TRANSFER_SRC)
+            .fill_from_slice(mx_ref);
+
+        let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor { todo: 0 });
+        encoder.copy_buffer_to_buffer(&temp_buf, 0, &self.uniform_buf, 0, 64);
+        device.get_queue().submit(&[encoder.finish()]);
     }
 
     fn render(&mut self, frame: &wgpu::SwapChainOutput, device: &mut wgpu::Device) {
diff --git a/gfx-examples/src/shadow.rs b/gfx-examples/src/shadow.rs
index 976a1f84e..3a818fecc 100644
--- a/gfx-examples/src/shadow.rs
+++ b/gfx-examples/src/shadow.rs
@@ -5,16 +5,16 @@ use std::rc::Rc;
 mod framework;
 
 
-#[derive(Clone)]
+#[derive(Clone, Copy)]
 struct Vertex {
-    pos: [i8; 4],
-    normal: [i8; 4],
+    _pos: [i8; 4],
+    _normal: [i8; 4],
 }
 
 fn vertex(pos: [i8; 3], nor: [i8; 3]) -> Vertex {
     Vertex {
-        pos: [pos[0], pos[1], pos[2], 1],
-        normal: [nor[0], nor[1], nor[2], 0],
+        _pos: [pos[0], pos[1], pos[2], 1],
+        _normal: [nor[0], nor[1], nor[2], 0],
     }
 }
 
@@ -101,6 +101,7 @@ struct Light {
 }
 
 #[repr(C)]
+#[derive(Clone, Copy)]
 struct LightRaw {
     proj: [[f32; 4]; 4],
     pos: [f32; 4],
@@ -132,14 +133,16 @@ impl Light {
 }
 
 #[repr(C)]
+#[derive(Clone, Copy)]
 struct ForwardUniforms {
     proj: [[f32; 4]; 4],
     num_lights: [u32; 4],
 }
 
 #[repr(C)]
+#[derive(Clone, Copy)]
 struct EntityUniforms {
-    model: [[f32; 4]; 4],
+    model: cgmath::Matrix4<f32>,
     color: [f32; 4],
 }
 
@@ -190,28 +193,25 @@ impl framework::Example for Example {
         // Create the vertex and index buffers
         let vertex_size = mem::size_of::<Vertex>();
         let (cube_vertex_data, cube_index_data) = create_cube();
-        let cube_vertex_buf = Rc::new(device.create_buffer(&wgpu::BufferDescriptor {
-            size: (cube_vertex_data.len() * vertex_size) as u32,
-            usage: wgpu::BufferUsageFlags::VERTEX | wgpu::BufferUsageFlags::TRANSFER_DST,
-        }));
-        cube_vertex_buf.set_sub_data(0, framework::cast_slice(&cube_vertex_data));
-        let cube_index_buf = Rc::new(device.create_buffer(&wgpu::BufferDescriptor {
-            size: (cube_index_data.len() * 2) as u32,
-            usage: wgpu::BufferUsageFlags::INDEX | wgpu::BufferUsageFlags::TRANSFER_DST,
-        }));
-        cube_index_buf.set_sub_data(0, framework::cast_slice(&cube_index_data));
+        let cube_vertex_buf = Rc::new(
+            device.create_buffer_mapped(cube_vertex_data.len(), wgpu::BufferUsageFlags::VERTEX)
+            .fill_from_slice(&cube_vertex_data)
+        );
+
+        let cube_index_buf = Rc::new(
+            device.create_buffer_mapped(cube_index_data.len(), wgpu::BufferUsageFlags::INDEX)
+            .fill_from_slice(&cube_index_data)
+        );
 
         let (plane_vertex_data, plane_index_data) = create_plane(7);
-        let plane_vertex_buf = device.create_buffer(&wgpu::BufferDescriptor {
-            size: (plane_vertex_data.len() * vertex_size) as u32,
-            usage: wgpu::BufferUsageFlags::VERTEX | wgpu::BufferUsageFlags::TRANSFER_DST,
-        });
-        plane_vertex_buf.set_sub_data(0, framework::cast_slice(&plane_vertex_data));
-        let plane_index_buf = device.create_buffer(&wgpu::BufferDescriptor {
-            size: (plane_index_data.len() * 2) as u32,
-            usage: wgpu::BufferUsageFlags::INDEX | wgpu::BufferUsageFlags::TRANSFER_DST,
-        });
-        plane_index_buf.set_sub_data(0, framework::cast_slice(&plane_index_data));
+        let plane_vertex_buf =
+            device.create_buffer_mapped(plane_vertex_data.len(), wgpu::BufferUsageFlags::VERTEX)
+            .fill_from_slice(&plane_vertex_data);
+
+        let plane_index_buf =
+            device.create_buffer_mapped(plane_index_data.len(), wgpu::BufferUsageFlags::INDEX)
+            .fill_from_slice(&plane_index_data);
+
         let entity_uniform_size = mem::size_of::<EntityUniforms>() as u32;
         let plane_uniform_buf = device.create_buffer(&wgpu::BufferDescriptor {
             size: entity_uniform_size,
@@ -517,17 +517,15 @@ impl framework::Example for Example {
                 ],
             });
 
-            let uniform_size = mem::size_of::<ForwardUniforms>() as u32;
-            let uniform_buf = device.create_buffer(&wgpu::BufferDescriptor {
-                size: uniform_size,
-                usage: wgpu::BufferUsageFlags::UNIFORM | wgpu::BufferUsageFlags::TRANSFER_DST,
-            });
             let mx_total = Self::generate_matrix(sc_desc.width as f32 / sc_desc.height as f32);
-            let data = ForwardUniforms {
+            let forward_uniforms = ForwardUniforms {
                 proj: *mx_total.as_ref(),
                 num_lights: [lights.len() as u32, 0, 0, 0],
             };
-            uniform_buf.set_sub_data(0, framework::cast_slice(&[data]));
+            let uniform_size = mem::size_of::<ForwardUniforms>() as u32;
+            let uniform_buf =
+                device.create_buffer_mapped(1, wgpu::BufferUsageFlags::UNIFORM | wgpu::BufferUsageFlags::TRANSFER_DST)
+                .fill_from_slice(&[forward_uniforms]);
 
             // Create bind group
             let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
@@ -639,9 +637,17 @@ impl framework::Example for Example {
     }
 
     fn resize(&mut self, sc_desc: &wgpu::SwapChainDescriptor, device: &mut wgpu::Device) {
-        let mx_total = Self::generate_matrix(sc_desc.width as f32 / sc_desc.height as f32);
-        let mx_ref: &[f32; 16] = mx_total.as_ref();
-        self.forward_pass.uniform_buf.set_sub_data(0, framework::cast_slice(&mx_ref[..]));
+        {
+            let mx_total = Self::generate_matrix(sc_desc.width as f32 / sc_desc.height as f32);
+            let mx_ref: &[f32; 16] = mx_total.as_ref();
+            let temp_buf =
+                device.create_buffer_mapped(16, wgpu::BufferUsageFlags::TRANSFER_SRC)
+                .fill_from_slice(mx_ref);
+
+            let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor { todo: 0 });
+            encoder.copy_buffer_to_buffer(&temp_buf, 0, &self.forward_pass.uniform_buf, 0, 64);
+            device.get_queue().submit(&[encoder.finish()]);
+        }
 
         let depth_texture = device.create_texture(&wgpu::TextureDescriptor {
             size: wgpu::Extent3d {
@@ -658,28 +664,42 @@ impl framework::Example for Example {
     }
 
     fn render(&mut self, frame: &wgpu::SwapChainOutput, device: &mut wgpu::Device) {
-        for entity in &mut self.entities {
-            if entity.rotation_speed != 0.0 {
-                let rotation = cgmath::Matrix4::from_angle_x(cgmath::Deg(entity.rotation_speed));
-                entity.mx_world = entity.mx_world * rotation;
-            }
-            let data = EntityUniforms {
-                model: *entity.mx_world.as_ref(),
-                color: [entity.color.r, entity.color.g, entity.color.b, entity.color.a],
-            };
-            entity.uniform_buf.set_sub_data(0, framework::cast_slice(&[data]));
-        }
-        if self.lights_are_dirty {
-            self.lights_are_dirty = false;
-            let raw = self.lights
-                .iter()
-                .map(|light| light.to_raw())
-                .collect::<Vec<_>>();
-            self.light_uniform_buf.set_sub_data(0, framework::cast_slice(&raw));
-        }
-
         let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor { todo: 0 });
 
+        {
+            let size = mem::size_of::<EntityUniforms>() as u32;
+            let temp_buf_data =
+                device.create_buffer_mapped(self.entities.len(), wgpu::BufferUsageFlags::TRANSFER_SRC);
+
+            for (i, entity) in self.entities.iter_mut().enumerate() {
+                if entity.rotation_speed != 0.0 {
+                    let rotation = cgmath::Matrix4::from_angle_x(cgmath::Deg(entity.rotation_speed));
+                    entity.mx_world = entity.mx_world * rotation;
+                }
+                temp_buf_data.data[i] = EntityUniforms {
+                    model: entity.mx_world.clone(),
+                    color: [entity.color.r, entity.color.g, entity.color.b, entity.color.a],
+                };
+            }
+
+            let temp_buf = temp_buf_data.finish();
+
+            for (i, entity) in self.entities.iter().enumerate() {
+                encoder.copy_buffer_to_buffer(&temp_buf, i as u32 * size, &entity.uniform_buf, 0, size);
+            }
+        }
+
+        if self.lights_are_dirty {
+            self.lights_are_dirty = false;
+            let size = (self.lights.len() * mem::size_of::<LightRaw>()) as u32;
+            let temp_buf_data =
+                device.create_buffer_mapped(self.lights.len(), wgpu::BufferUsageFlags::TRANSFER_SRC);
+            for (i, light) in self.lights.iter().enumerate() {
+                temp_buf_data.data[i] = light.to_raw();
+            }
+            encoder.copy_buffer_to_buffer(&temp_buf_data.finish(), 0, &self.light_uniform_buf, 0, size);
+        }
+        
         for (i, light) in self.lights.iter().enumerate() {
             // The light uniform buffer already has the projection,
             // let's just copy it over to the shadow uniform buffer.
diff --git a/wgpu-native/src/device.rs b/wgpu-native/src/device.rs
index 64273143e..b209f133b 100644
--- a/wgpu-native/src/device.rs
+++ b/wgpu-native/src/device.rs
@@ -277,27 +277,25 @@ impl DestroyedResources<back::Backend> {
             let mut operation = None;
             let (result, ptr) = {
                 let mut buffer_guard = HUB.buffers.write();
-                let buffer = &mut buffer_guard[buffer_id];
+                let mut buffer = &mut buffer_guard[buffer_id];
                 std::mem::swap(&mut operation, &mut buffer.pending_map_operation);
                 match operation.clone().unwrap() {
                     BufferMapOperation::Read(range, ..) => {
-                        if let Ok(ptr) = unsafe { raw.map_memory(&buffer.memory, range.clone()) } {
-                            if !buffer.memory_properties.contains(hal::memory::Properties::COHERENT) {
-                                unsafe { raw.invalidate_mapped_memory_ranges(iter::once((&buffer.memory, range.clone()))).unwrap()  }; // TODO
+                        match map_buffer(raw, &mut buffer, range.clone(), true, false) {
+                            Ok(ptr) => (BufferMapAsyncStatus::Success, Some(ptr)),
+                            Err(e) => {
+                                log::error!("failed to map buffer for reading: {}", e);
+                                (BufferMapAsyncStatus::Error, None)
                             }
-                            (BufferMapAsyncStatus::Success, Some(ptr))
-                        } else {
-                            (BufferMapAsyncStatus::Error, None)
                         }
                     },
                     BufferMapOperation::Write(range, ..) => {
-                        if let Ok(ptr) = unsafe { raw.map_memory(&buffer.memory, range.clone()) } {
-                            if !buffer.memory_properties.contains(hal::memory::Properties::COHERENT) {
-                                buffer.mapped_write_ranges.push(range.clone());
+                        match map_buffer(raw, &mut buffer, range.clone(), false, true) {
+                            Ok(ptr) => (BufferMapAsyncStatus::Success, Some(ptr)),
+                            Err(e) => {
+                                log::error!("failed to map buffer for writing: {}", e);
+                                (BufferMapAsyncStatus::Error, None)
                             }
-                            (BufferMapAsyncStatus::Success, Some(ptr))
-                        } else {
-                            (BufferMapAsyncStatus::Error, None)
                         }
                     },
                 }
@@ -311,6 +309,23 @@ impl DestroyedResources<back::Backend> {
     }
 }
 
+fn map_buffer(
+    raw: &<back::Backend as hal::Backend>::Device,
+    buffer: &mut resource::Buffer<back::Backend>,
+    range: std::ops::Range<u64>,
+    read: bool,
+    write: bool,
+) -> Result<*mut u8, hal::mapping::Error> {
+    let pointer = unsafe { raw.map_memory(&buffer.memory, range.clone()) }?;
+    if read && !buffer.memory_properties.contains(hal::memory::Properties::COHERENT) {
+        unsafe { raw.invalidate_mapped_memory_ranges(iter::once((&buffer.memory, range.clone()))).unwrap()  }; // TODO
+    }
+    if write && !buffer.memory_properties.contains(hal::memory::Properties::COHERENT) {
+        buffer.mapped_write_ranges.push(range.clone());
+    }
+    Ok(pointer)
+}
+
 pub struct Device<B: hal::Backend> {
     pub(crate) raw: B::Device,
     adapter_id: AdapterId,
@@ -502,19 +517,24 @@ pub extern "C" fn wgpu_device_create_buffer_mapped(
     desc: &resource::BufferDescriptor,
     mapped_ptr_out: *mut *mut u8
 ) -> BufferId {
-    let buffer = device_create_buffer(device_id, desc);
+    let mut desc = desc.clone();
+    desc.usage |= resource::BufferUsageFlags::MAP_WRITE;
+    let mut buffer = device_create_buffer(device_id, &desc);
 
     let device_guard = HUB.devices.read();
     let device = &device_guard[device_id];
 
-    if let Ok(ptr) = unsafe { device.raw.map_memory(&buffer.memory, 0..(desc.size as u64)) } {
-        unsafe{ *mapped_ptr_out = ptr; }    
+    match map_buffer(&device.raw, &mut buffer, 0..(desc.size as u64), false, true) {
+        Ok(ptr) => unsafe { *mapped_ptr_out = ptr; }
+        Err(e) => {
+            log::error!("failed to create buffer in a mapped state: {}", e);
+            unsafe { *mapped_ptr_out = std::ptr::null_mut(); }
+        }
     }
 
     let ref_count = buffer.life_guard.ref_count.clone();
     let id = HUB.buffers.register_local(buffer);
     device_track_buffer(device_id, id, ref_count, resource::BufferUsageFlags::MAP_WRITE);
-
     id
 }
 
diff --git a/wgpu-native/src/resource.rs b/wgpu-native/src/resource.rs
index 97a6a278e..20bce19ee 100644
--- a/wgpu-native/src/resource.rs
+++ b/wgpu-native/src/resource.rs
@@ -28,6 +28,7 @@ bitflags! {
 }
 
 #[repr(C)]
+#[derive(Clone)]
 pub struct BufferDescriptor {
     pub size: u32,
     pub usage: BufferUsageFlags,
diff --git a/wgpu-rs/src/lib.rs b/wgpu-rs/src/lib.rs
index e52a1948a..9ffe4f341 100644
--- a/wgpu-rs/src/lib.rs
+++ b/wgpu-rs/src/lib.rs
@@ -233,6 +233,25 @@ impl<'a> TextureCopyView<'a> {
     }
 }
 
+pub struct CreateBufferMapped<'a, T> {
+    id: wgn::BufferId,
+    pub data: &'a mut [T],
+}
+
+impl<'a, T> CreateBufferMapped<'a, T>
+        where T: Copy {
+    pub fn fill_from_slice(self, slice: &[T]) -> Buffer {
+        self.data.copy_from_slice(slice);
+        self.finish()
+    }
+
+    pub fn finish(self) -> Buffer {
+        wgn::wgpu_buffer_unmap(self.id);
+        Buffer {
+            id: self.id,
+        }
+    }
+}
 
 impl Instance {
     pub fn new() -> Self {
@@ -432,21 +451,22 @@ impl Device {
         }
     }
 
-    pub fn create_buffer_mapped<T>(&self, desc: &BufferDescriptor) -> (Buffer, &mut [T])
+    pub fn create_buffer_mapped<'a, T>(&self, count: usize, usage: BufferUsageFlags) -> CreateBufferMapped<'a, T>
             where T: 'static + Copy {
         let type_size = std::mem::size_of::<T>() as u32;
         assert_ne!(type_size, 0);
-        assert_eq!(desc.size % type_size, 0);
 
+        let desc = BufferDescriptor{
+            size: type_size * count as u32,
+            usage,
+        };
         let mut ptr : *mut u8 = std::ptr::null_mut();
 
-        let buffer = Buffer {
-            id: wgn::wgpu_device_create_buffer_mapped(self.id, desc, &mut ptr as *mut *mut u8),
-        };
+        let id = wgn::wgpu_device_create_buffer_mapped(self.id, &desc, &mut ptr as *mut *mut u8);
 
-        let data = unsafe { std::slice::from_raw_parts_mut(ptr as *mut T, desc.size as usize / std::mem::size_of::<T>()) };
+        let data = unsafe { std::slice::from_raw_parts_mut(ptr as *mut T, count) };
 
-        (buffer, data)
+        CreateBufferMapped{id, data}
     }
 
     pub fn create_texture(&self, desc: &TextureDescriptor) -> Texture {