diff --git a/Cargo.lock b/Cargo.lock
index 41edf6a13..9b808d023 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,3 +1,11 @@
+[[package]]
+name = "aho-corasick"
+version = "0.6.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "andrew"
 version = "0.1.6"
@@ -220,10 +228,23 @@ name = "downcast-rs"
 version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "env_logger"
+version = "0.5.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+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)",
+ "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "examples"
 version = "0.1.0"
 dependencies = [
+ "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "wgpu 0.1.0",
  "wgpu-native 0.1.0",
 ]
@@ -380,6 +401,14 @@ dependencies = [
  "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "humantime"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "itoa"
 version = "0.4.3"
@@ -442,6 +471,15 @@ dependencies = [
  "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.1.3"
+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"
@@ -609,6 +647,11 @@ dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "quick-error"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "quote"
 version = "0.5.2"
@@ -748,6 +791,26 @@ dependencies = [
  "redox_syscall 0.1.51 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "regex"
+version = "1.1.0"
+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)",
+ "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)",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "remove_dir_all"
 version = "0.5.1"
@@ -951,6 +1014,14 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "termcolor"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "termion"
 version = "1.5.1"
@@ -969,6 +1040,14 @@ dependencies = [
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+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)",
+]
+
 [[package]]
 name = "toml"
 version = "0.4.10"
@@ -977,6 +1056,11 @@ dependencies = [
  "serde 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "ucd-util"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "unicode-width"
 version = "0.1.5"
@@ -995,6 +1079,11 @@ dependencies = [
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "utf8-ranges"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "vec_map"
 version = "0.8.1"
@@ -1128,6 +1217,15 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "wincolor"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "winit"
 version = "0.18.1"
@@ -1197,6 +1295,7 @@ 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 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 ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
@@ -1223,6 +1322,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum derivative 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6073e9676dbebdddeabaeb63e3b7cefd23c86f5c41d381ee1237cc77b1079898"
 "checksum dlib 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "77e51249a9d823a4cb79e3eca6dcd756153e8ed0157b6c04775d04bf1b13b76a"
 "checksum downcast-rs 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "18df8ce4470c189d18aa926022da57544f31e154631eb4cfe796aea97051fe6c"
+"checksum env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)" = "15b0a4d2e39f8420210be8b27eeda28029729e2fd4291019455016c348240c38"
 "checksum failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "795bd83d3abeb9220f257e597aa0080a508b27533824adf336529648f6abf7e2"
 "checksum failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "ea1063915fd7ef4309e222a5a07cf9c319fb9c7836b1f89b85458672dbb127e1"
 "checksum foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
@@ -1237,6 +1337,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum gfx-backend-metal 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "68fa011e32280f7566bddbb736734291b685c812087c99bc848d6ac7ae3e0b7f"
 "checksum gfx-backend-vulkan 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "982c618fd9ddeea7e68b2d872b9b6cf13024fc7d4033ba90f0e54ac0d33c798f"
 "checksum gfx-hal 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "84c470bce77fcaaea6854858682a99026ff796b880b0ca30511593a6b2bc77c0"
+"checksum humantime 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3ca7e5f2e110db35f93b837c81797f3714500b81d517bf20c431b16d3ca4f114"
 "checksum itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1306f3464951f30e30d12373d31c79fbd52d236e5e896fd92f96ec7babbbe60b"
 "checksum lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "76f033c7ad61445c5b347c7382dd1237847eb1bce590fe50365dcb33d546be73"
 "checksum lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a374c89b9db55895453a74c1e38861d9deec0b01b405a82516e9d5de4820dea1"
@@ -1246,6 +1347,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "62ebf1391f6acad60e5c8b43706dde4582df75c06698ab44511d15016bc2442c"
 "checksum log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c84ec4b527950aa83a329754b01dbe3f58361d1c5efacd1f6d68c494d08a17c6"
 "checksum malloc_buf 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "62bb907fe88d54d8d9ce32a3cceab4218ed2f6b7d35617cafe9adf84e43919cb"
+"checksum memchr 2.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e1dd4eaac298c32ce07eb6ed9242eda7d82955b9170b7d6db59b2e02cc63fcb8"
 "checksum memmap 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6585fd95e7bb50d6cc31e20d4cf9afb4e2ba16c5846fc76793f11218da9c475b"
 "checksum metal 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7de9c2b83c946ab01c9942928388f911d93486b97636d9927541345905fea65d"
 "checksum nix 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "921f61dc817b379d0834e45d5ec45beaacfae97082090a49c2cf30dcbc30206f"
@@ -1265,6 +1367,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "676e8eb2b1b4c9043511a9b7bea0915320d7e502b0a079fb03f9635a5252b18c"
 "checksum proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "1b06e2f335f48d24442b35a19df506a835fb3547bc3c06ef27340da9acf5cae7"
 "checksum proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)" = "38fddd23d98b2144d197c0eca5705632d4fe2667d14a6be5df8934f8d74f1978"
+"checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
 "checksum quote 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9949cfe66888ffe1d53e6ec9d9f3b70714083854be20fd5e271b232a017401e8"
 "checksum quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)" = "cdd8e04bd9c52e0342b406469d494fcb033be4bdbe5c606016defbb1681411e1"
 "checksum rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e464cd887e869cddcae8792a4ee31d23c7edd516700695608f5b98c67ee0131c"
@@ -1281,6 +1384,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
 "checksum redox_syscall 0.1.51 (registry+https://github.com/rust-lang/crates.io-index)" = "423e376fffca3dfa06c9e9790a9ccd282fafb3cc6e6397d01dbf64f9bacc6b85"
 "checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
+"checksum regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "37e7cbbd370869ce2e8dff25c7018702d10b21a20ef7135316f8daecd6c25b7f"
+"checksum regex-syntax 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "8c2f35eedad5295fdf00a63d7d4b238135723f92b434ec06774dad15c7ab0861"
 "checksum remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3488ba1b9a2084d38645c4c08276a1752dcbf2c7130d74f1569681ad5d2799c5"
 "checksum rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "adacaae16d02b6ec37fdc7acfcddf365978de76d1983d3ee22afc260e1ca9619"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
@@ -1305,12 +1410,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)" = "f92e629aa1d9c827b2bb8297046c1ccffc57c99b947a680d3ccff1f136a3bee9"
 "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 termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4096add70612622289f2fdcdbd5086dc81c1e2675e6ae58d6c4f62a16c6d7f2f"
 "checksum termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "689a3bdfaab439fd92bc87df5c4c78417d3cbe537487274e9b0b2dce76e92096"
 "checksum textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "307686869c93e71f94da64286f9a9524c0f308a9e1c87a583de8e9c9039ad3f6"
+"checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
 "checksum toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "758664fc71a3a69038656bee8b6be6477d2a6c315a6b81f7081f591bffa4111f"
+"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"
 "checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 "checksum walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "9d9d7ed3431229a144296213105a390676cc49c9b6a72bd19f3176c98e129fa1"
@@ -1323,6 +1432,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 "checksum winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "afc5508759c5bf4285e61feb862b6083c8480aec864fa17a81fdec6f69b461ab"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+"checksum wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "561ed901ae465d6185fa7864d63fbd5720d0ef718366c9a4dc83cf6170d7e9ba"
 "checksum winit 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c57c15bd4c0ef18dff33e263e452abe32d00e2e05771cacaa410a14cc1c0776"
 "checksum wio 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f8a31e8a268d6941ffb7f8d7989fc93e4692bd3e75a27d400a72b4be1dadb213"
 "checksum x11 2.18.1 (registry+https://github.com/rust-lang/crates.io-index)" = "39697e3123f715483d311b5826e254b6f3cfebdd83cf7ef3358f579c3d68e235"
diff --git a/examples/Cargo.toml b/examples/Cargo.toml
index a180fb5f2..a0a858040 100644
--- a/examples/Cargo.toml
+++ b/examples/Cargo.toml
@@ -23,3 +23,4 @@ vulkan = ["wgpu-native/gfx-backend-vulkan"]
 [dependencies]
 wgpu-native = { path = "../wgpu-native" }
 wgpu = { path = "../wgpu-rs" }
+env_logger = "0.5"
diff --git a/examples/hello_triangle_rust/main.rs b/examples/hello_triangle_rust/main.rs
index 30890d92b..ba6ed735c 100644
--- a/examples/hello_triangle_rust/main.rs
+++ b/examples/hello_triangle_rust/main.rs
@@ -1,7 +1,10 @@
+extern crate env_logger;
 extern crate wgpu;
 extern crate wgpu_native;
 
 fn main() {
+    env_logger::init();
+
     let instance = wgpu::Instance::new();
     let adapter = instance.get_adapter(&wgpu::AdapterDescriptor {
         power_preference: wgpu::PowerPreference::LowPower,
@@ -66,7 +69,7 @@ fn main() {
 
         let surface = instance.create_surface(&window);
         let swap_chain = device.create_swap_chain(&surface, &wgpu::SwapChainDescriptor {
-            usage: wgpu::TextureUsageFlags::OUTPUT_ATTACHMENT | wgpu::TextureUsageFlags::PRESENT,
+            usage: wgpu::TextureUsageFlags::OUTPUT_ATTACHMENT,
             format: wgpu::TextureFormat::B8g8r8a8Unorm,
             width: size.width as u32,
             height: size.height as u32,
diff --git a/wgpu-bindings/wgpu.h b/wgpu-bindings/wgpu.h
index 15b1a4604..8435b4c84 100644
--- a/wgpu-bindings/wgpu.h
+++ b/wgpu-bindings/wgpu.h
@@ -436,8 +436,6 @@ typedef struct {
 
 #define WGPUTextureUsageFlags_OUTPUT_ATTACHMENT 16
 
-#define WGPUTextureUsageFlags_PRESENT 32
-
 #define WGPUTextureUsageFlags_SAMPLED 4
 
 #define WGPUTextureUsageFlags_STORAGE 8
@@ -455,6 +453,11 @@ WGPUDeviceId wgpu_adapter_create_device(WGPUAdapterId adapter_id,
 
 void wgpu_buffer_destroy(WGPUBufferId buffer_id);
 
+void wgpu_buffer_set_sub_data(WGPUBufferId buffer_id,
+                              uint32_t start,
+                              uint32_t count,
+                              const uint8_t *data);
+
 WGPUComputePassId wgpu_command_buffer_begin_compute_pass(WGPUCommandBufferId command_buffer_id);
 
 WGPURenderPassId wgpu_command_buffer_begin_render_pass(WGPUCommandBufferId command_buffer_id,
diff --git a/wgpu-native/src/command/mod.rs b/wgpu-native/src/command/mod.rs
index cff0871e9..61e36b71c 100644
--- a/wgpu-native/src/command/mod.rs
+++ b/wgpu-native/src/command/mod.rs
@@ -7,7 +7,10 @@ pub(crate) use self::allocator::CommandAllocator;
 pub use self::compute::*;
 pub use self::render::*;
 
-use crate::device::{FramebufferKey, RenderPassKey};
+use crate::device::{
+    FramebufferKey, RenderPassKey,
+    all_buffer_stages, all_image_stages,
+};
 use crate::registry::{Items, HUB};
 use crate::swap_chain::{SwapChainLink, SwapImageEpoch};
 use crate::track::{BufferTracker, TextureTracker};
@@ -21,7 +24,7 @@ use crate::{
 };
 
 use hal::command::RawCommandBuffer;
-use hal::Device;
+use hal::{Device as _Device};
 use log::trace;
 
 use std::collections::hash_map::Entry;
@@ -109,6 +112,7 @@ impl CommandBuffer<B> {
         Gb: Items<resource::Buffer<B>>,
         Gt: Items<resource::Texture<B>>,
     {
+
         let buffer_barriers = buffer_iter.map(|(id, transit)| {
             let b = buffer_guard.get(id);
             trace!("transit {:?} {:?}", id, transit);
@@ -134,9 +138,11 @@ impl CommandBuffer<B> {
                 families: None,
             }
         });
+
+        let stages = all_buffer_stages() | all_image_stages();
         unsafe {
             raw.pipeline_barrier(
-                hal::pso::PipelineStage::TOP_OF_PIPE..hal::pso::PipelineStage::BOTTOM_OF_PIPE,
+                stages .. stages,
                 hal::memory::Dependencies::empty(),
                 buffer_barriers.chain(texture_barriers),
             );
diff --git a/wgpu-native/src/conv.rs b/wgpu-native/src/conv.rs
index 0838f3a75..4e9c02e87 100644
--- a/wgpu-native/src/conv.rs
+++ b/wgpu-native/src/conv.rs
@@ -356,7 +356,7 @@ pub fn map_texture_state(
 
     let is_color = aspects.contains(hal::format::Aspects::COLOR);
     let layout = match usage {
-        W::WRITE_ALL => return (A::empty(), L::Undefined), // special value
+        W::UNINITIALIZED => return (A::empty(), L::Undefined),
         W::TRANSFER_SRC => L::TransferSrcOptimal,
         W::TRANSFER_DST => L::TransferDstOptimal,
         W::SAMPLED => L::ShaderReadOnlyOptimal,
diff --git a/wgpu-native/src/device.rs b/wgpu-native/src/device.rs
index 9565af3e5..e187c3356 100644
--- a/wgpu-native/src/device.rs
+++ b/wgpu-native/src/device.rs
@@ -26,6 +26,27 @@ use std::collections::hash_map::{Entry, HashMap};
 use std::sync::atomic::Ordering;
 
 
+pub fn all_buffer_stages() -> hal::pso::PipelineStage {
+    use hal::pso::PipelineStage as Ps;
+    Ps::DRAW_INDIRECT |
+    Ps::VERTEX_INPUT |
+    Ps::VERTEX_SHADER |
+    Ps::FRAGMENT_SHADER |
+    Ps::COMPUTE_SHADER |
+    Ps::TRANSFER |
+    Ps::HOST
+}
+pub fn all_image_stages() -> hal::pso::PipelineStage {
+    use hal::pso::PipelineStage as Ps;
+    Ps::EARLY_FRAGMENT_TESTS |
+    Ps::LATE_FRAGMENT_TESTS |
+    Ps::COLOR_ATTACHMENT_OUTPUT |
+    Ps::VERTEX_SHADER |
+    Ps::FRAGMENT_SHADER |
+    Ps::COMPUTE_SHADER |
+    Ps::TRANSFER
+}
+
 #[derive(Hash, PartialEq)]
 pub(crate) struct RenderPassKey {
     pub attachments: Vec<hal::pass::Attachment>,
@@ -236,6 +257,7 @@ impl<B: hal::Backend> Device<B> {
     }
 }
 
+
 pub(crate) struct ShaderModule<B: hal::Backend> {
     pub raw: B::ShaderModule,
 }
@@ -297,7 +319,7 @@ pub extern "C" fn wgpu_device_create_buffer(
         .lock()
         .query(
             &Stored { value: id, ref_count },
-            resource::BufferUsageFlags::WRITE_ALL,
+            resource::BufferUsageFlags::empty(),
         );
     assert!(query.initialized);
 
@@ -394,7 +416,7 @@ pub extern "C" fn wgpu_device_create_texture(
         .lock()
         .query(
             &Stored { value: id, ref_count },
-            resource::TextureUsageFlags::WRITE_ALL,
+            resource::TextureUsageFlags::UNINITIALIZED,
         );
     assert!(query.initialized);
 
@@ -1173,7 +1195,7 @@ pub extern "C" fn wgpu_device_create_swap_chain(
         };
         device.texture_tracker
             .lock()
-            .query(&texture_id, resource::TextureUsageFlags::WRITE_ALL);
+            .query(&texture_id, resource::TextureUsageFlags::UNINITIALIZED);
 
         let view = resource::TextureView {
             raw: view_raw,
@@ -1241,7 +1263,7 @@ pub extern "C" fn wgpu_buffer_set_sub_data(
             hal::command::CommandBufferInheritanceInfo::default(),
         );
         raw.pipeline_barrier(
-            hal::pso::PipelineStage::TOP_OF_PIPE .. hal::pso::PipelineStage::TRANSFER,
+            all_buffer_stages() .. hal::pso::PipelineStage::TRANSFER,
             hal::memory::Dependencies::empty(),
             barrier,
         );
diff --git a/wgpu-native/src/resource.rs b/wgpu-native/src/resource.rs
index 0bc835e8a..aa5e30254 100644
--- a/wgpu-native/src/resource.rs
+++ b/wgpu-native/src/resource.rs
@@ -72,9 +72,9 @@ bitflags! {
         const SAMPLED = 4;
         const STORAGE = 8;
         const OUTPUT_ATTACHMENT = 16;
-        const PRESENT = 32;
         const NONE = 0;
         const WRITE_ALL = 2 + 8 + 16;
+        const UNINITIALIZED = 0xFFFF;
     }
 }
 
diff --git a/wgpu-native/src/swap_chain.rs b/wgpu-native/src/swap_chain.rs
index bb692cbc9..e9cabeb94 100644
--- a/wgpu-native/src/swap_chain.rs
+++ b/wgpu-native/src/swap_chain.rs
@@ -2,6 +2,7 @@ use crate::{Stored, WeaklyStored,
     DeviceId, SwapChainId, TextureId, TextureViewId,
 };
 use crate::{conv, resource};
+use crate::device::all_image_stages;
 use crate::registry::{HUB, Items};
 use crate::track::{TrackPermit};
 
@@ -115,20 +116,22 @@ pub extern "C" fn wgpu_swap_chain_present(
         None => unreachable!(),
     }
 
+    //TODO: support for swapchain being sampled or read by the shader?
+
     trace!("transit {:?} to present", frame.texture_id.value);
     let barrier = device.texture_tracker
         .lock()
         .transit(
             frame.texture_id.value,
             &texture.life_guard.ref_count,
-            resource::TextureUsageFlags::PRESENT,
+            resource::TextureUsageFlags::UNINITIALIZED,
             TrackPermit::REPLACE,
         )
         .unwrap()
         .into_source()
         .map(|old| hal::memory::Barrier::Image {
             states: conv::map_texture_state(old, hal::format::Aspects::COLOR) ..
-                (hal::image::Access::empty(), hal::image::Layout::Present),
+                (hal::image::Access::COLOR_ATTACHMENT_WRITE, hal::image::Layout::Present),
             target: &texture.raw,
             families: None,
             range: texture.full_range.clone(),
@@ -137,7 +140,7 @@ pub extern "C" fn wgpu_swap_chain_present(
     unsafe {
         frame.comb.begin(false);
         frame.comb.pipeline_barrier(
-            hal::pso::PipelineStage::TOP_OF_PIPE .. hal::pso::PipelineStage::BOTTOM_OF_PIPE,
+            all_image_stages() .. hal::pso::PipelineStage::COLOR_ATTACHMENT_OUTPUT,
             hal::memory::Dependencies::empty(),
             barrier,
         );