diff --git a/Cargo.lock b/Cargo.lock
index c38b439a..026cde47 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -202,6 +202,24 @@ dependencies = [
  "nix 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "canvas-webgl-minimal"
+version = "0.1.0"
+dependencies = [
+ "pathfinder_canvas 0.5.0",
+ "pathfinder_color 0.5.0",
+ "pathfinder_content 0.5.0",
+ "pathfinder_geometry 0.5.1",
+ "pathfinder_gl 0.5.0",
+ "pathfinder_gpu 0.5.0",
+ "pathfinder_renderer 0.5.0",
+ "pathfinder_resources 0.5.0",
+ "pathfinder_webgl 0.1.0",
+ "wasm-bindgen 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-test 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "web-sys 0.3.37 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "canvas_glutin_minimal"
 version = "0.1.0"
@@ -324,11 +342,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.106 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -460,6 +478,15 @@ dependencies = [
  "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "console_error_panic_hook"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "const-random"
 version = "0.1.8"
@@ -1236,10 +1263,10 @@ dependencies = [
 
 [[package]]
 name = "js-sys"
-version = "0.3.37"
+version = "0.3.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "wasm-bindgen 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1833,6 +1860,7 @@ dependencies = [
  "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "half 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.23.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "instant 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "pathfinder_color 0.5.0",
  "pathfinder_geometry 0.5.1",
@@ -1992,14 +2020,14 @@ name = "pathfinder_webgl"
 version = "0.1.0"
 dependencies = [
  "image 0.23.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "js-sys 0.3.37 (registry+https://github.com/rust-lang/crates.io-index)",
+ "js-sys 0.3.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "pathfinder_geometry 0.5.1",
  "pathfinder_gpu 0.5.0",
  "pathfinder_renderer 0.5.0",
  "pathfinder_resources 0.5.0",
  "pathfinder_simd 0.5.0",
- "wasm-bindgen 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "web-sys 0.3.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2058,7 +2086,7 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.10"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2093,7 +2121,7 @@ name = "quote"
 version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2270,6 +2298,11 @@ dependencies = [
  "winapi-util 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "scoped-tls"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "scoped_threadpool"
 version = "0.1.9"
@@ -2293,9 +2326,9 @@ name = "scroll_derive"
 version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2344,9 +2377,9 @@ name = "serde_derive"
 version = "1.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2590,10 +2623,10 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.17"
+version = "1.0.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2768,53 +2801,86 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.60"
+version = "0.2.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasm-bindgen-macro 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-macro 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.60"
+version = "0.2.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bumpalo 3.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasm-bindgen-shared 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-shared 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wasm-bindgen-futures"
+version = "0.4.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "js-sys 0.3.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "web-sys 0.3.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.60"
+version = "0.2.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasm-bindgen-macro-support 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-macro-support 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.60"
+version = "0.2.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasm-bindgen-backend 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasm-bindgen-shared 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-backend 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-shared 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.60"
+version = "0.2.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "wasm-bindgen-test"
+version = "0.3.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "console_error_panic_hook 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "js-sys 0.3.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scoped-tls 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-futures 0.4.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-test-macro 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wasm-bindgen-test-macro"
+version = "0.3.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "wayland-client"
 version = "0.21.13"
@@ -2938,8 +3004,8 @@ name = "web-sys"
 version = "0.3.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "js-sys 0.3.37 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasm-bindgen 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "js-sys 0.3.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3130,6 +3196,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum color-backtrace 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "65d13f1078cc63c791d0deba0dd43db37c9ec02b311f10bed10b577016f3a957"
 "checksum color_quant 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0dbbb57365263e881e805dc77d94697c9118fd94d8da011240555aa7b23445bd"
 "checksum combine 3.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "da3da6baa321ec19e1cc41d31bf599f00c783d0517095cdaf0332e3fe8d20680"
+"checksum console_error_panic_hook 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "b8d976903543e0c48546a91908f21588a680a8c8f984df9a5d69feccb2b2a211"
 "checksum const-random 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "2f1af9ac737b2dd2d577701e59fd09ba34822f6f2ebdb30a7647405d9e55e16a"
 "checksum const-random-macro 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "25e4c606eb459dd29f7c57b2e0879f2b6f14ee130918c2b78ccb58a9624e6c7a"
 "checksum constant_time_eq 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
@@ -3211,7 +3278,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum jni 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4ba3cd65bd48a02c50381dc90678744e1cc9842d0c957bf5a4660618df10a0c2"
 "checksum jni-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8eaf4bc02d17cbdd7ff4c7438cafcdf7fb9a4613313ad11b4f8fefe7d3fa0130"
 "checksum jpeg-decoder 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)" = "0256f0aec7352539102a9efbcb75543227b7ab1117e0f95450023af730128451"
-"checksum js-sys 0.3.37 (registry+https://github.com/rust-lang/crates.io-index)" = "6a27d435371a2fa5b6d2b028a74bbdb1234f308da363226a2854ca3ff8ba7055"
+"checksum js-sys 0.3.41 (registry+https://github.com/rust-lang/crates.io-index)" = "c4b9172132a62451e56142bff9afc91c8e4a4500aa5b847da36815b63bfda916"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 "checksum khronos 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c0711aaa80e6ba6eb1fa8978f1f46bfcb38ceb2f3f33f3736efbff39dac89f50"
 "checksum khronos_api 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2db585e1d738fc771bf08a151420d3ed193d9d895a36df7f6f8a9456b911ddc"
@@ -3271,7 +3338,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum pretty_env_logger 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "926d36b9553851b8b0005f1275891b392ee4d2d833852c417ed025477350fb9d"
 "checksum proc-macro-hack 0.5.15 (registry+https://github.com/rust-lang/crates.io-index)" = "0d659fe7c6d27f25e9d80a1a094c223f5246f6a6596453e09d7229bf42750b63"
 "checksum proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)" = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
-"checksum proc-macro2 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)" = "df246d292ff63439fea9bc8c0a270bed0e390d5ebd4db4ba15aba81111b5abe3"
+"checksum proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)" = "beae6331a816b1f65d04c45b078fd8e6c93e8071771f41b8163255bbd8d7c8fa"
 "checksum quick-error 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
 "checksum quickcheck 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a44883e74aa97ad63db83c4bf8ca490f02b2fc02f92575e720c8551e843c945f"
 "checksum quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1"
@@ -3297,6 +3364,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum rusttype 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "9f61411055101f7b60ecf1041d87fb74205fb20b0c7a723f07ef39174cf6b4c0"
 "checksum ryu 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535622e6be132bccd223f4bb2b8ac8d53cda3c7a6394944d3b2b33fb974f9d76"
 "checksum same-file 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
+"checksum scoped-tls 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ea6a9290e3c9cf0f18145ef7ffa62d68ee0bf5fcd651017e586dc7fd5da448c2"
 "checksum scoped_threadpool 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1d51f5df5af43ab3f1360b429fa5e0152ac5ce8c0bd6485cae490332e96846a8"
 "checksum scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 "checksum scroll 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "abb2332cb595d33f7edd5700f4cbf94892e680c7f0ae56adab58a35190b66cb1"
@@ -3329,7 +3397,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum swf-fixed 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6b212c20df50b382c442a4098d7d9f1c94f0b040f0f0a5d120fa3a82fa51e302"
 "checksum swf-parser 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "847c41c7add3a5a64524fa5883ba4f2ecaccb2e429df9a3d4ed17ad8e379c15f"
 "checksum swf-types 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b1c05702364986055179557b04f797fecbc0cd1ef12c07536edd254b085b3540"
-"checksum syn 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)" = "0df0eb663f387145cab623dea85b09c2c5b4b0aef44e945d928e682fce71bb03"
+"checksum syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)" = "e8d5d96e8cbb005d6959f119f773bfaebb5684296108fb32600c00cde305b2cd"
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
 "checksum termcolor 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
 "checksum textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
@@ -3352,11 +3420,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 "checksum walkdir 2.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "777182bc735b6424e1a57516d35ed72cb8019d85c8c9bf536dccb3445c1a2f7d"
 "checksum wasi 0.9.0+wasi-snapshot-preview1 (registry+https://github.com/rust-lang/crates.io-index)" = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-"checksum wasm-bindgen 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)" = "2cc57ce05287f8376e998cbddfb4c8cb43b84a7ec55cf4551d7c00eef317a47f"
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-"checksum wasm-bindgen-shared 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)" = "daf76fe7d25ac79748a37538b7daeed1c7a6867c92d3245c12c6222e4a20d639"
+"checksum wasm-bindgen 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)" = "6a634620115e4a229108b71bde263bb4220c483b3f07f5ba514ee8d15064c4c2"
+"checksum wasm-bindgen-backend 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)" = "3e53963b583d18a5aa3aaae4b4c1cb535218246131ba22a71f05b518098571df"
+"checksum wasm-bindgen-futures 0.4.14 (registry+https://github.com/rust-lang/crates.io-index)" = "dba48d66049d2a6cc8488702e7259ab7afc9043ad0dc5448444f46f2a453b362"
+"checksum wasm-bindgen-macro 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)" = "3fcfd5ef6eec85623b4c6e844293d4516470d8f19cd72d0d12246017eb9060b8"
+"checksum wasm-bindgen-macro-support 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)" = "9adff9ee0e94b926ca81b57f57f86d5545cdcb1d259e21ec9bdd95b901754c75"
+"checksum wasm-bindgen-shared 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)" = "7f7b90ea6c632dd06fd765d44542e234d5e63d9bb917ecd64d79778a13bd79ae"
+"checksum wasm-bindgen-test 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "8edfbb0918bc0e8207c38200c9462ba8d03d8276dd99bdca14c08281af61883f"
+"checksum wasm-bindgen-test-macro 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "343d02640a91e4cd89d81dba8b9047991b4bf103657c1a2d18884808c83642fc"
 "checksum wayland-client 0.21.13 (registry+https://github.com/rust-lang/crates.io-index)" = "49963e5f9eeaf637bfcd1b9f0701c99fd5cd05225eb51035550d4272806f2713"
 "checksum wayland-client 0.23.6 (registry+https://github.com/rust-lang/crates.io-index)" = "af1080ebe0efabcf12aef2132152f616038f2d7dcbbccf7b2d8c5270fe14bcda"
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diff --git a/Cargo.toml b/Cargo.toml
index db37ef4d..95c2cddc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,7 @@ members = [
     "examples/canvas_moire",
     "examples/canvas_nanovg",
     "examples/canvas_text",
+    "examples/canvas_webgl_minimal",
     "examples/lottie_basic",
     "examples/swf_basic",
     "geometry",
diff --git a/examples/canvas_webgl_minimal/Cargo.toml b/examples/canvas_webgl_minimal/Cargo.toml
new file mode 100644
index 00000000..501f7ef5
--- /dev/null
+++ b/examples/canvas_webgl_minimal/Cargo.toml
@@ -0,0 +1,52 @@
+[package]
+name = "canvas-webgl-minimal"
+version = "0.1.0"
+authors = ["Patrick Walton <pcwalton@mimiga.net>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = []
+
+[dependencies]
+wasm-bindgen = "0.2.63"
+
+[dependencies.pathfinder_canvas]
+path = "../../canvas"
+
+[dependencies.pathfinder_color]
+path = "../../color"
+
+[dependencies.pathfinder_content]
+path = "../../content"
+
+[dependencies.pathfinder_geometry]
+path = "../../geometry"
+
+[dependencies.pathfinder_gl]
+path = "../../gl"
+
+[dependencies.pathfinder_gpu]
+path = "../../gpu"
+
+[dependencies.pathfinder_renderer]
+path = "../../renderer"
+
+[dependencies.pathfinder_resources]
+path = "../../resources"
+
+[dependencies.pathfinder_webgl]
+path = "../../webgl"
+
+[dependencies.web-sys]
+version = "0.3"
+features = ["Window"]
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3.13"
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"
diff --git a/examples/canvas_webgl_minimal/README.md b/examples/canvas_webgl_minimal/README.md
new file mode 100644
index 00000000..1e4617a6
--- /dev/null
+++ b/examples/canvas_webgl_minimal/README.md
@@ -0,0 +1,69 @@
+<div align="center">
+
+  <h1><code>wasm-pack-template</code></h1>
+
+  <strong>A template for kick starting a Rust and WebAssembly project using <a href="https://github.com/rustwasm/wasm-pack">wasm-pack</a>.</strong>
+
+  <p>
+    <a href="https://travis-ci.org/rustwasm/wasm-pack-template"><img src="https://img.shields.io/travis/rustwasm/wasm-pack-template.svg?style=flat-square" alt="Build Status" /></a>
+  </p>
+
+  <h3>
+    <a href="https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html">Tutorial</a>
+    <span> | </span>
+    <a href="https://discordapp.com/channels/442252698964721669/443151097398296587">Chat</a>
+  </h3>
+
+  <sub>Built with 🦀🕸 by <a href="https://rustwasm.github.io/">The Rust and WebAssembly Working Group</a></sub>
+</div>
+
+## About
+
+[**📚 Read this template tutorial! 📚**][template-docs]
+
+This template is designed for compiling Rust libraries into WebAssembly and
+publishing the resulting package to NPM.
+
+Be sure to check out [other `wasm-pack` tutorials online][tutorials] for other
+templates and usages of `wasm-pack`.
+
+[tutorials]: https://rustwasm.github.io/docs/wasm-pack/tutorials/index.html
+[template-docs]: https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html
+
+## 🚴 Usage
+
+### 🐑 Use `cargo generate` to Clone this Template
+
+[Learn more about `cargo generate` here.](https://github.com/ashleygwilliams/cargo-generate)
+
+```
+cargo generate --git https://github.com/rustwasm/wasm-pack-template.git --name my-project
+cd my-project
+```
+
+### 🛠️ Build with `wasm-pack build`
+
+```
+wasm-pack build
+```
+
+### 🔬 Test in Headless Browsers with `wasm-pack test`
+
+```
+wasm-pack test --headless --firefox
+```
+
+### 🎁 Publish to NPM with `wasm-pack publish`
+
+```
+wasm-pack publish
+```
+
+## 🔋 Batteries Included
+
+* [`wasm-bindgen`](https://github.com/rustwasm/wasm-bindgen) for communicating
+  between WebAssembly and JavaScript.
+* [`console_error_panic_hook`](https://github.com/rustwasm/console_error_panic_hook)
+  for logging panic messages to the developer console.
+* [`wee_alloc`](https://github.com/rustwasm/wee_alloc), an allocator optimized
+  for small code size.
diff --git a/examples/canvas_webgl_minimal/src/lib.rs b/examples/canvas_webgl_minimal/src/lib.rs
new file mode 100644
index 00000000..317e3356
--- /dev/null
+++ b/examples/canvas_webgl_minimal/src/lib.rs
@@ -0,0 +1,86 @@
+// pathfinder/examples/canvas_webgl_minimal/src/lib.rs
+//
+// Copyright © 2020 The Pathfinder Project Developers.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use pathfinder_canvas::{Canvas, CanvasFontContext, Path2D};
+use pathfinder_color::ColorF;
+use pathfinder_geometry::rect::RectF;
+use pathfinder_geometry::vector::{vec2f, vec2i};
+use pathfinder_renderer::concurrent::executor::SequentialExecutor;
+use pathfinder_renderer::gpu::options::{DestFramebuffer, RendererMode, RendererOptions};
+use pathfinder_renderer::gpu::renderer::Renderer;
+use pathfinder_renderer::options::BuildOptions;
+use pathfinder_resources::embedded::EmbeddedResourceLoader;
+use pathfinder_webgl::WebGlDevice;
+use wasm_bindgen::JsCast;
+use wasm_bindgen::prelude::*;
+use web_sys::{self, HtmlCanvasElement, WebGl2RenderingContext};
+
+mod utils;
+
+#[wasm_bindgen]
+extern {
+    fn alert(s: &str);
+}
+
+#[wasm_bindgen]
+pub fn rust_main() {
+    utils::set_panic_hook();
+
+    let document = web_sys::window().unwrap().document().unwrap();
+    let canvas = document.get_element_by_id("c").unwrap();
+    let canvas: HtmlCanvasElement = canvas.dyn_into::<HtmlCanvasElement>().unwrap();
+
+    let context = canvas.get_context("webgl2")
+                        .unwrap()
+                        .unwrap()
+                        .dyn_into::<WebGl2RenderingContext>()
+                        .unwrap();
+
+    // Get the real size of the window, taking HiDPI into account.
+    let framebuffer_size = vec2i(canvas.width() as i32, canvas.height() as i32);
+
+    // Create a Pathfinder GL device.
+    let pathfinder_device = WebGlDevice::new(context);
+
+    // Create a Pathfinder renderer.
+    let mode = RendererMode::default_for_device(&pathfinder_device);
+    let options = RendererOptions {
+        dest: DestFramebuffer::full_window(framebuffer_size),
+        background_color: Some(ColorF::white()),
+        ..RendererOptions::default()
+    };
+    let resource_loader = EmbeddedResourceLoader::new();
+    let mut renderer = Renderer::new(pathfinder_device, &resource_loader, mode, options);
+
+    // Make a canvas. We're going to draw a house.
+    let font_context = CanvasFontContext::from_system_source();
+    let mut canvas = Canvas::new(framebuffer_size.to_f32()).get_context_2d(font_context);
+
+    // Set line width.
+    canvas.set_line_width(10.0);
+
+    // Draw walls.
+    canvas.stroke_rect(RectF::new(vec2f(75.0, 140.0), vec2f(150.0, 110.0)));
+
+    // Draw door.
+    canvas.fill_rect(RectF::new(vec2f(130.0, 190.0), vec2f(40.0, 60.0)));
+
+    // Draw roof.
+    let mut path = Path2D::new();
+    path.move_to(vec2f(50.0, 140.0));
+    path.line_to(vec2f(150.0, 60.0));
+    path.line_to(vec2f(250.0, 140.0));
+    path.close_path();
+    canvas.stroke_path(path);
+
+    // Render the canvas to screen.
+    let mut scene = canvas.into_canvas().into_scene();
+    scene.build_and_render(&mut renderer, BuildOptions::default(), SequentialExecutor);
+}
diff --git a/examples/canvas_webgl_minimal/src/utils.rs b/examples/canvas_webgl_minimal/src/utils.rs
new file mode 100644
index 00000000..b1d7929d
--- /dev/null
+++ b/examples/canvas_webgl_minimal/src/utils.rs
@@ -0,0 +1,10 @@
+pub fn set_panic_hook() {
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    #[cfg(feature = "console_error_panic_hook")]
+    console_error_panic_hook::set_once();
+}
diff --git a/examples/canvas_webgl_minimal/tests/web.rs b/examples/canvas_webgl_minimal/tests/web.rs
new file mode 100644
index 00000000..de5c1daf
--- /dev/null
+++ b/examples/canvas_webgl_minimal/tests/web.rs
@@ -0,0 +1,13 @@
+//! Test suite for the Web and headless browsers.
+
+#![cfg(target_arch = "wasm32")]
+
+extern crate wasm_bindgen_test;
+use wasm_bindgen_test::*;
+
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[wasm_bindgen_test]
+fn pass() {
+    assert_eq!(1 + 1, 2);
+}
diff --git a/examples/canvas_webgl_minimal/www/.bin/create-wasm-app.js b/examples/canvas_webgl_minimal/www/.bin/create-wasm-app.js
new file mode 100755
index 00000000..2f42973d
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/.bin/create-wasm-app.js
@@ -0,0 +1,24 @@
+#!/usr/bin/env node
+
+const { spawn } = require("child_process");
+const fs = require("fs");
+
+let folderName = '.';
+
+if (process.argv.length >= 3) {
+  folderName = process.argv[2];
+  if (!fs.existsSync(folderName)) {
+    fs.mkdirSync(folderName);
+  }
+}
+
+const clone = spawn("git", ["clone", "https://github.com/rustwasm/create-wasm-app.git", folderName]);
+
+clone.on("close", code => {
+  if (code !== 0) {
+    console.error("cloning the template failed!")
+    process.exit(code);
+  } else {
+    console.log("🦀 Rust + 🕸 Wasm = ❤");
+  }
+});
diff --git a/examples/canvas_webgl_minimal/www/.travis.yml b/examples/canvas_webgl_minimal/www/.travis.yml
new file mode 100644
index 00000000..04d40b4d
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/.travis.yml
@@ -0,0 +1,5 @@
+language: node_js
+node_js: "10"
+
+script:
+  - ./node_modules/.bin/webpack
diff --git a/examples/canvas_webgl_minimal/www/LICENSE-APACHE b/examples/canvas_webgl_minimal/www/LICENSE-APACHE
new file mode 100644
index 00000000..11069edd
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+   "License" shall mean the terms and conditions for use, reproduction,
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+   "Licensor" shall mean the copyright owner or entity authorized by
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+   "Legal Entity" shall mean the union of the acting entity and all
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+
+   "You" (or "Your") shall mean an individual or Legal Entity
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+   "Work" shall mean the work of authorship, whether in Source or
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+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
diff --git a/examples/canvas_webgl_minimal/www/LICENSE-MIT b/examples/canvas_webgl_minimal/www/LICENSE-MIT
new file mode 100644
index 00000000..7079daea
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) [year] [name]
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/examples/canvas_webgl_minimal/www/README.md b/examples/canvas_webgl_minimal/www/README.md
new file mode 100644
index 00000000..d658bb16
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/README.md
@@ -0,0 +1,67 @@
+<div align="center">
+
+  <h1><code>create-wasm-app</code></h1>
+
+  <strong>An <code>npm init</code> template for kick starting a project that uses NPM packages containing Rust-generated WebAssembly and bundles them with Webpack.</strong>
+
+  <p>
+    <a href="https://travis-ci.org/rustwasm/create-wasm-app"><img src="https://img.shields.io/travis/rustwasm/create-wasm-app.svg?style=flat-square" alt="Build Status" /></a>
+  </p>
+
+  <h3>
+    <a href="#usage">Usage</a>
+    <span> | </span>
+    <a href="https://discordapp.com/channels/442252698964721669/443151097398296587">Chat</a>
+  </h3>
+
+  <sub>Built with 🦀🕸 by <a href="https://rustwasm.github.io/">The Rust and WebAssembly Working Group</a></sub>
+</div>
+
+## About
+
+This template is designed for depending on NPM packages that contain
+Rust-generated WebAssembly and using them to create a Website.
+
+* Want to create an NPM package with Rust and WebAssembly? [Check out
+  `wasm-pack-template`.](https://github.com/rustwasm/wasm-pack-template)
+* Want to make a monorepo-style Website without publishing to NPM? Check out
+  [`rust-webpack-template`](https://github.com/rustwasm/rust-webpack-template)
+  and/or
+  [`rust-parcel-template`](https://github.com/rustwasm/rust-parcel-template).
+
+## 🚴 Usage
+
+```
+npm init wasm-app
+```
+
+## 🔋 Batteries Included
+
+- `.gitignore`: ignores `node_modules`
+- `LICENSE-APACHE` and `LICENSE-MIT`: most Rust projects are licensed this way, so these are included for you
+- `README.md`: the file you are reading now!
+- `index.html`: a bare bones html document that includes the webpack bundle
+- `index.js`: example js file with a comment showing how to import and use a wasm pkg
+- `package.json` and `package-lock.json`:
+  - pulls in devDependencies for using webpack:
+      - [`webpack`](https://www.npmjs.com/package/webpack)
+      - [`webpack-cli`](https://www.npmjs.com/package/webpack-cli)
+      - [`webpack-dev-server`](https://www.npmjs.com/package/webpack-dev-server)
+  - defines a `start` script to run `webpack-dev-server`
+- `webpack.config.js`: configuration file for bundling your js with webpack
+
+## License
+
+Licensed under either of
+
+* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual licensed as above, without any additional terms or
+conditions.
diff --git a/examples/canvas_webgl_minimal/www/bootstrap.js b/examples/canvas_webgl_minimal/www/bootstrap.js
new file mode 100644
index 00000000..b6d16006
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/bootstrap.js
@@ -0,0 +1,5 @@
+// A dependency graph that contains any wasm must all be imported
+// asynchronously. This `bootstrap.js` file does the single async import, so
+// that no one else needs to worry about it again.
+import("./index.js")
+  .catch(e => console.error("Error importing `index.js`:", e, e.stack));
diff --git a/examples/canvas_webgl_minimal/www/index.html b/examples/canvas_webgl_minimal/www/index.html
new file mode 100644
index 00000000..f7e2511f
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/index.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Hello wasm-pack!</title>
+  </head>
+  <body>
+    <noscript>This page contains webassembly and javascript content, please enable javascript in your browser.</noscript>
+    <canvas id=c width=800 height=600></canvas>
+    <script src="./bootstrap.js"></script>
+  </body>
+</html>
diff --git a/examples/canvas_webgl_minimal/www/index.js b/examples/canvas_webgl_minimal/www/index.js
new file mode 100644
index 00000000..b1284f80
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/index.js
@@ -0,0 +1,3 @@
+import * as wasm from "canvas_webgl_minimal";
+
+wasm.rust_main();
diff --git a/examples/canvas_webgl_minimal/www/package-lock.json b/examples/canvas_webgl_minimal/www/package-lock.json
new file mode 100644
index 00000000..4f72c94c
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/package-lock.json
@@ -0,0 +1,5848 @@
+{
+  "name": "create-wasm-app",
+  "version": "0.1.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
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+      "dev": true
+    },
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+      "dev": true,
+      "requires": {
+        "@types/events": "*",
+        "@types/minimatch": "*",
+        "@types/node": "*"
+      }
+    },
+    "@types/minimatch": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
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+    "@types/node": {
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+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "ws": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
+      "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
+      "dev": true,
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "dev": true
+    },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
+    "yallist": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.3.tgz",
+      "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==",
+      "dev": true
+    },
+    "yargs": {
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
+      "dev": true,
+      "requires": {
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.2"
+      }
+    },
+    "yargs-parser": {
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    }
+  }
+}
diff --git a/examples/canvas_webgl_minimal/www/package.json b/examples/canvas_webgl_minimal/www/package.json
new file mode 100644
index 00000000..11a61b3e
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/package.json
@@ -0,0 +1,39 @@
+{
+  "name": "create-wasm-app",
+  "version": "0.1.0",
+  "description": "create an app to consume rust-generated wasm packages",
+  "main": "index.js",
+  "bin": {
+    "create-wasm-app": ".bin/create-wasm-app.js"
+  },
+  "scripts": {
+    "build": "webpack --config webpack.config.js",
+    "start": "webpack-dev-server"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/rustwasm/create-wasm-app.git"
+  },
+  "keywords": [
+    "webassembly",
+    "wasm",
+    "rust",
+    "webpack"
+  ],
+  "author": "Ashley Williams <ashley666ashley@gmail.com>",
+  "license": "(MIT OR Apache-2.0)",
+  "bugs": {
+    "url": "https://github.com/rustwasm/create-wasm-app/issues"
+  },
+  "homepage": "https://github.com/rustwasm/create-wasm-app#readme",
+  "devDependencies": {
+    "hello-wasm-pack": "^0.1.0",
+    "webpack": "^4.29.3",
+    "webpack-cli": "^3.1.0",
+    "webpack-dev-server": "^3.1.5",
+    "copy-webpack-plugin": "^5.0.0"
+  },
+  "dependencies": {
+    "canvas_webgl_minimal": "file:../pkg"
+  }
+}
diff --git a/examples/canvas_webgl_minimal/www/webpack.config.js b/examples/canvas_webgl_minimal/www/webpack.config.js
new file mode 100644
index 00000000..80ad8142
--- /dev/null
+++ b/examples/canvas_webgl_minimal/www/webpack.config.js
@@ -0,0 +1,14 @@
+const CopyWebpackPlugin = require("copy-webpack-plugin");
+const path = require('path');
+
+module.exports = {
+  entry: "./bootstrap.js",
+  output: {
+    path: path.resolve(__dirname, "dist"),
+    filename: "bootstrap.js",
+  },
+  mode: "development",
+  plugins: [
+    new CopyWebpackPlugin(['index.html'])
+  ],
+};
diff --git a/gpu/Cargo.toml b/gpu/Cargo.toml
index 72c023b1..b0f973be 100644
--- a/gpu/Cargo.toml
+++ b/gpu/Cargo.toml
@@ -19,6 +19,10 @@ version = "0.23"
 default-features = false
 features = ["png"]
 
+[dependencies.instant]
+version = "0.1"
+features = ["wasm-bindgen"]
+
 [dependencies.pathfinder_color]
 path = "../color"
 version = "0.5"
diff --git a/gpu/src/allocator.rs b/gpu/src/allocator.rs
index fd248c1b..0e8ec203 100644
--- a/gpu/src/allocator.rs
+++ b/gpu/src/allocator.rs
@@ -11,12 +11,12 @@
 //! GPU memory management.
 
 use crate::{BufferData, BufferTarget, BufferUploadMode, Device, TextureFormat};
+use instant::Instant;
 use fxhash::FxHashMap;
 use pathfinder_geometry::vector::Vector2I;
 use std::collections::VecDeque;
 use std::default::Default;
 use std::mem;
-use std::time::Instant;
 
 // Everything above 16 MB is allocated exactly.
 const MAX_BUFFER_SIZE_CLASS: u64 = 16 * 1024 * 1024;
@@ -32,11 +32,13 @@ const DECAY_TIME: f32 = 0.250;
 const REUSE_TIME: f32 = 0.015;
 
 pub struct GPUMemoryAllocator<D> where D: Device {
-    buffers_in_use: FxHashMap<BufferID, BufferAllocation<D>>,
+    general_buffers_in_use: FxHashMap<GeneralBufferID, BufferAllocation<D>>,
+    index_buffers_in_use: FxHashMap<IndexBufferID, BufferAllocation<D>>,
     textures_in_use: FxHashMap<TextureID, TextureAllocation<D>>,
     framebuffers_in_use: FxHashMap<FramebufferID, FramebufferAllocation<D>>,
     free_objects: VecDeque<FreeObject<D>>,
-    next_buffer_id: BufferID,
+    next_general_buffer_id: GeneralBufferID,
+    next_index_buffer_id: IndexBufferID,
     next_texture_id: TextureID,
     next_framebuffer_id: FramebufferID,
     bytes_committed: u64,
@@ -67,7 +69,8 @@ struct FreeObject<D> where D: Device {
 }
 
 enum FreeObjectKind<D> where D: Device {
-    Buffer { id: BufferID, allocation: BufferAllocation<D> },
+    GeneralBuffer { id: GeneralBufferID, allocation: BufferAllocation<D> },
+    IndexBuffer { id: IndexBufferID, allocation: BufferAllocation<D> },
     Texture { id: TextureID, allocation: TextureAllocation<D> },
     Framebuffer { id: FramebufferID, allocation: FramebufferAllocation<D> },
 }
@@ -79,8 +82,13 @@ pub struct TextureDescriptor {
     format: TextureFormat,
 }
 
+// Vertex or storage buffers.
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
-pub struct BufferID(pub u64);
+pub struct GeneralBufferID(pub u64);
+
+// Index buffers.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct IndexBufferID(pub u64);
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct TextureID(pub u64);
@@ -103,11 +111,13 @@ pub struct FramebufferTag(pub &'static str);
 impl<D> GPUMemoryAllocator<D> where D: Device {
     pub fn new() -> GPUMemoryAllocator<D> {
         GPUMemoryAllocator {
-            buffers_in_use: FxHashMap::default(),
+            general_buffers_in_use: FxHashMap::default(),
+            index_buffers_in_use: FxHashMap::default(),
             textures_in_use: FxHashMap::default(),
             framebuffers_in_use: FxHashMap::default(),
             free_objects: VecDeque::new(),
-            next_buffer_id: BufferID(0),
+            next_general_buffer_id: GeneralBufferID(0),
+            next_index_buffer_id: IndexBufferID(0),
             next_texture_id: TextureID(0),
             next_framebuffer_id: FramebufferID(0),
             bytes_committed: 0,
@@ -115,7 +125,8 @@ impl<D> GPUMemoryAllocator<D> where D: Device {
         }
     }
 
-    pub fn allocate_buffer<T>(&mut self, device: &D, size: u64, tag: BufferTag) -> BufferID {
+    pub fn allocate_general_buffer<T>(&mut self, device: &D, size: u64, tag: BufferTag)
+                                      -> GeneralBufferID {
         let mut byte_size = size * mem::size_of::<T>() as u64;
         if byte_size < MAX_BUFFER_SIZE_CLASS {
             byte_size = byte_size.next_power_of_two();
@@ -127,14 +138,17 @@ impl<D> GPUMemoryAllocator<D> where D: Device {
             match self.free_objects[free_object_index] {
                 FreeObject {
                     ref timestamp,
-                    kind: FreeObjectKind::Buffer { ref allocation, .. },
+                    kind: FreeObjectKind::GeneralBuffer { ref allocation, .. },
                 } if allocation.size == byte_size &&
                     (now - *timestamp).as_secs_f32() >= REUSE_TIME => {}
                 _ => continue,
             }
 
             let (id, mut allocation) = match self.free_objects.remove(free_object_index) {
-                Some(FreeObject { kind: FreeObjectKind::Buffer { id, allocation }, .. }) => {
+                Some(FreeObject {
+                    kind: FreeObjectKind::GeneralBuffer { id, allocation },
+                    ..
+                }) => {
                     (id, allocation)
                 }
                 _ => unreachable!(),
@@ -142,7 +156,7 @@ impl<D> GPUMemoryAllocator<D> where D: Device {
 
             allocation.tag = tag;
             self.bytes_committed += allocation.size;
-            self.buffers_in_use.insert(id, allocation);
+            self.general_buffers_in_use.insert(id, allocation);
             return id;
         }
 
@@ -151,17 +165,71 @@ impl<D> GPUMemoryAllocator<D> where D: Device {
                                      BufferData::Uninitialized(byte_size as usize),
                                      BufferTarget::Vertex);
 
-        let id = self.next_buffer_id;
-        self.next_buffer_id.0 += 1;
+        let id = self.next_general_buffer_id;
+        self.next_general_buffer_id.0 += 1;
 
-        debug!("mapping buffer: {:?} {} ({}x{}) {:?}",
+        debug!("mapping general buffer: {:?} {} ({}x{}) {:?}",
                id,
                byte_size,
                size,
                mem::size_of::<T>(),
                tag);
 
-        self.buffers_in_use.insert(id, BufferAllocation { buffer, size: byte_size, tag });
+        self.general_buffers_in_use.insert(id, BufferAllocation { buffer, size: byte_size, tag });
+        self.bytes_allocated += byte_size;
+        self.bytes_committed += byte_size;
+
+        id
+    }
+
+    pub fn allocate_index_buffer<T>(&mut self, device: &D, size: u64, tag: BufferTag)
+                                    -> IndexBufferID {
+        let mut byte_size = size * mem::size_of::<T>() as u64;
+        if byte_size < MAX_BUFFER_SIZE_CLASS {
+            byte_size = byte_size.next_power_of_two();
+        }
+
+        let now = Instant::now();
+
+        for free_object_index in 0..self.free_objects.len() {
+            match self.free_objects[free_object_index] {
+                FreeObject {
+                    ref timestamp,
+                    kind: FreeObjectKind::IndexBuffer { ref allocation, .. },
+                } if allocation.size == byte_size &&
+                    (now - *timestamp).as_secs_f32() >= REUSE_TIME => {}
+                _ => continue,
+            }
+
+            let (id, mut allocation) = match self.free_objects.remove(free_object_index) {
+                Some(FreeObject { kind: FreeObjectKind::IndexBuffer { id, allocation }, .. }) => {
+                    (id, allocation)
+                }
+                _ => unreachable!(),
+            };
+
+            allocation.tag = tag;
+            self.bytes_committed += allocation.size;
+            self.index_buffers_in_use.insert(id, allocation);
+            return id;
+        }
+
+        let buffer = device.create_buffer(BufferUploadMode::Dynamic);
+        device.allocate_buffer::<u8>(&buffer,
+                                     BufferData::Uninitialized(byte_size as usize),
+                                     BufferTarget::Index);
+
+        let id = self.next_index_buffer_id;
+        self.next_index_buffer_id.0 += 1;
+
+        debug!("mapping index buffer: {:?} {} ({}x{}) {:?}",
+               id,
+               byte_size,
+               size,
+               mem::size_of::<T>(),
+               tag);
+
+        self.index_buffers_in_use.insert(id, BufferAllocation { buffer, size: byte_size, tag });
         self.bytes_allocated += byte_size;
         self.bytes_committed += byte_size;
 
@@ -277,8 +345,15 @@ impl<D> GPUMemoryAllocator<D> where D: Device {
             }
             match self.free_objects.pop_front() {
                 None => break,
-                Some(FreeObject { kind: FreeObjectKind::Buffer { allocation, .. }, .. }) => {
-                    debug!("purging buffer: {}", allocation.size);
+                Some(FreeObject {
+                    kind: FreeObjectKind::GeneralBuffer { allocation, .. },
+                    ..
+                }) => {
+                    debug!("purging general buffer: {}", allocation.size);
+                    self.bytes_allocated -= allocation.size;
+                }
+                Some(FreeObject { kind: FreeObjectKind::IndexBuffer { allocation, .. }, .. }) => {
+                    debug!("purging index buffer: {}", allocation.size);
                     self.bytes_allocated -= allocation.size;
                 }
                 Some(FreeObject { kind: FreeObjectKind::Texture { allocation, .. }, .. }) => {
@@ -293,14 +368,25 @@ impl<D> GPUMemoryAllocator<D> where D: Device {
         }
     }
 
-    pub fn free_buffer(&mut self, id: BufferID) {
-        let allocation = self.buffers_in_use
+    pub fn free_general_buffer(&mut self, id: GeneralBufferID) {
+        let allocation = self.general_buffers_in_use
                              .remove(&id)
-                             .expect("Attempted to free unallocated buffer!");
+                             .expect("Attempted to free unallocated general buffer!");
         self.bytes_committed -= allocation.size;
         self.free_objects.push_back(FreeObject {
             timestamp: Instant::now(),
-            kind: FreeObjectKind::Buffer { id, allocation },
+            kind: FreeObjectKind::GeneralBuffer { id, allocation },
+        });
+    }
+
+    pub fn free_index_buffer(&mut self, id: IndexBufferID) {
+        let allocation = self.index_buffers_in_use
+                             .remove(&id)
+                             .expect("Attempted to free unallocated index buffer!");
+        self.bytes_committed -= allocation.size;
+        self.free_objects.push_back(FreeObject {
+            timestamp: Instant::now(),
+            kind: FreeObjectKind::IndexBuffer { id, allocation },
         });
     }
 
@@ -328,8 +414,12 @@ impl<D> GPUMemoryAllocator<D> where D: Device {
         });
     }
 
-    pub fn get_buffer(&self, id: BufferID) -> &D::Buffer {
-        &self.buffers_in_use[&id].buffer
+    pub fn get_general_buffer(&self, id: GeneralBufferID) -> &D::Buffer {
+        &self.general_buffers_in_use[&id].buffer
+    }
+
+    pub fn get_index_buffer(&self, id: IndexBufferID) -> &D::Buffer {
+        &self.index_buffers_in_use[&id].buffer
     }
 
     pub fn get_texture(&self, id: TextureID) -> &D::Texture {
@@ -355,11 +445,19 @@ impl<D> GPUMemoryAllocator<D> where D: Device {
         println!("GPU memory dump");
         println!("---------------");
 
-        println!("Buffers:");
-        let mut ids: Vec<BufferID> = self.buffers_in_use.keys().cloned().collect();
+        println!("General buffers:");
+        let mut ids: Vec<GeneralBufferID> = self.general_buffers_in_use.keys().cloned().collect();
         ids.sort();
         for id in ids {
-            let allocation = &self.buffers_in_use[&id];
+            let allocation = &self.general_buffers_in_use[&id];
+            println!("id {:?}: {:?} ({:?} B)", id, allocation.tag, allocation.size);
+        }
+
+        println!("Index buffers:");
+        let mut ids: Vec<IndexBufferID> = self.index_buffers_in_use.keys().cloned().collect();
+        ids.sort();
+        for id in ids {
+            let allocation = &self.index_buffers_in_use[&id];
             println!("id {:?}: {:?} ({:?} B)", id, allocation.tag, allocation.size);
         }
 
diff --git a/renderer/Cargo.toml b/renderer/Cargo.toml
index 8d84d49e..95d48b8b 100644
--- a/renderer/Cargo.toml
+++ b/renderer/Cargo.toml
@@ -22,7 +22,10 @@ serde = "1.0"
 serde_json = "1.0"
 smallvec = "1.2"
 vec_map = "0.8"
-instant = { version = "0.1.2", features = ["wasm-bindgen"] }
+
+[dependencies.instant]
+version = "0.1"
+features = ["wasm-bindgen"]
 
 [dependencies.pathfinder_color]
 path = "../color"
diff --git a/renderer/src/gpu/d3d11/renderer.rs b/renderer/src/gpu/d3d11/renderer.rs
index 0e4c32c6..f8982f9d 100644
--- a/renderer/src/gpu/d3d11/renderer.rs
+++ b/renderer/src/gpu/d3d11/renderer.rs
@@ -19,7 +19,7 @@ use crate::gpu_data::{TileBatchTexture, TilePathInfoD3D11};
 use byte_slice_cast::AsSliceOf;
 use pathfinder_geometry::transform2d::Transform2F;
 use pathfinder_geometry::vector::Vector2F;
-use pathfinder_gpu::allocator::{BufferID, BufferTag, GPUMemoryAllocator};
+use pathfinder_gpu::allocator::{BufferTag, GeneralBufferID, GPUMemoryAllocator};
 use pathfinder_gpu::{BufferTarget, ComputeDimensions, ComputeState, Device, ImageAccess};
 use pathfinder_gpu::{RenderTarget, UniformData};
 use pathfinder_resources::ResourceLoader;
@@ -62,22 +62,23 @@ impl<D> RendererD3D11<D> where D: Device {
 
     fn bound(&mut self,
              core: &mut RendererCore<D>,
-             tiles_d3d11_buffer_id: BufferID,
+             tiles_d3d11_buffer_id: GeneralBufferID,
              tile_count: u32,
              tile_path_info: &[TilePathInfoD3D11]) {
         let bound_program = &self.programs.bound_program;
 
         let path_info_buffer_id =
-            core.allocator.allocate_buffer::<TilePathInfoD3D11>(&core.device,
-                                                                tile_path_info.len() as u64,
-                                                                BufferTag("TilePathInfoD3D11"));
-        let tile_path_info_buffer = core.allocator.get_buffer(path_info_buffer_id);
+            core.allocator
+                .allocate_general_buffer::<TilePathInfoD3D11>(&core.device,
+                                                              tile_path_info.len() as u64,
+                                                              BufferTag("TilePathInfoD3D11"));
+        let tile_path_info_buffer = core.allocator.get_general_buffer(path_info_buffer_id);
         core.device.upload_to_buffer(tile_path_info_buffer,
                                      0,
                                      tile_path_info,
                                      BufferTarget::Storage);
 
-        let tiles_buffer = core.allocator.get_buffer(tiles_d3d11_buffer_id);
+        let tiles_buffer = core.allocator.get_general_buffer(tiles_d3d11_buffer_id);
 
         let timer_query = core.timer_query_cache.start_timing_draw_call(&core.device,
                                                                         &core.options);
@@ -105,7 +106,7 @@ impl<D> RendererD3D11<D> where D: Device {
         core.finish_timing_draw_call(&timer_query);
         core.current_timer.as_mut().unwrap().push_query(TimeCategory::Other, timer_query);
 
-        core.allocator.free_buffer(path_info_buffer_id);
+        core.allocator.free_general_buffer(path_info_buffer_id);
     }
 
     fn upload_propagate_metadata(&mut self,
@@ -114,20 +115,21 @@ impl<D> RendererD3D11<D> where D: Device {
                                  backdrops: &[BackdropInfoD3D11])
                                  -> PropagateMetadataBufferIDsD3D11 {
         let propagate_metadata_storage_id =
-            core.allocator
-                .allocate_buffer::<PropagateMetadataD3D11>(&core.device,
-                                                           propagate_metadata.len() as u64,
-                                                           BufferTag("PropagateMetadataD3D11"));
-        let propagate_metadata_buffer = core.allocator.get_buffer(propagate_metadata_storage_id);
+            core.allocator.allocate_general_buffer::<PropagateMetadataD3D11>(
+                &core.device,
+                propagate_metadata.len() as u64,
+                BufferTag("PropagateMetadataD3D11"));
+        let propagate_metadata_buffer =
+            core.allocator.get_general_buffer(propagate_metadata_storage_id);
         core.device.upload_to_buffer(propagate_metadata_buffer,
                                      0,
                                      propagate_metadata,
                                      BufferTarget::Storage);
 
-        let backdrops_storage_id =
-            core.allocator.allocate_buffer::<BackdropInfoD3D11>(&core.device,
-                                                                backdrops.len() as u64,
-                                                                BufferTag("BackdropInfoD3D11"));
+        let backdrops_storage_id = core.allocator.allocate_general_buffer::<BackdropInfoD3D11>(
+            &core.device,
+            backdrops.len() as u64,
+            BufferTag("BackdropInfoD3D11"));
 
         PropagateMetadataBufferIDsD3D11 {
              propagate_metadata: propagate_metadata_storage_id,
@@ -137,9 +139,9 @@ impl<D> RendererD3D11<D> where D: Device {
 
     fn upload_initial_backdrops(&self,
                                 core: &RendererCore<D>,
-                                backdrops_buffer_id: BufferID,
+                                backdrops_buffer_id: GeneralBufferID,
                                 backdrops: &[BackdropInfoD3D11]) {
-        let backdrops_buffer = core.allocator.get_buffer(backdrops_buffer_id);
+        let backdrops_buffer = core.allocator.get_general_buffer(backdrops_buffer_id);
         core.device.upload_to_buffer(backdrops_buffer, 0, backdrops, BufferTarget::Storage);
     }
 
@@ -147,28 +149,29 @@ impl<D> RendererD3D11<D> where D: Device {
                     core: &mut RendererCore<D>,
                     microlines_storage: &MicrolinesBufferIDsD3D11,
                     propagate_metadata_buffer_ids: &PropagateMetadataBufferIDsD3D11,
-                    tiles_d3d11_buffer_id: BufferID,
-                    z_buffer_id: BufferID)
+                    tiles_d3d11_buffer_id: GeneralBufferID,
+                    z_buffer_id: GeneralBufferID)
                     -> Option<FillBufferInfoD3D11> {
         let bin_program = &self.programs.bin_program;
 
         let fill_vertex_buffer_id =
-            core.allocator.allocate_buffer::<Fill>(&core.device,
-                                                   self.allocated_fill_count as u64,
-                                                   BufferTag("Fill"));
+            core.allocator.allocate_general_buffer::<Fill>(&core.device,
+                                                           self.allocated_fill_count as u64,
+                                                           BufferTag("Fill"));
 
-        let fill_vertex_buffer = core.allocator.get_buffer(fill_vertex_buffer_id);
-        let microlines_buffer = core.allocator.get_buffer(microlines_storage.buffer_id);
-        let tiles_buffer = core.allocator.get_buffer(tiles_d3d11_buffer_id);
+        let fill_vertex_buffer = core.allocator.get_general_buffer(fill_vertex_buffer_id);
+        let microlines_buffer = core.allocator.get_general_buffer(microlines_storage.buffer_id);
+        let tiles_buffer = core.allocator.get_general_buffer(tiles_d3d11_buffer_id);
         let propagate_metadata_buffer =
-            core.allocator.get_buffer(propagate_metadata_buffer_ids.propagate_metadata);
-        let backdrops_buffer = core.allocator.get_buffer(propagate_metadata_buffer_ids.backdrops);
+            core.allocator.get_general_buffer(propagate_metadata_buffer_ids.propagate_metadata);
+        let backdrops_buffer =
+            core.allocator.get_general_buffer(propagate_metadata_buffer_ids.backdrops);
 
         // Upload fill indirect draw params to header of the Z-buffer.
         //
         // This is in the Z-buffer, not its own buffer, to work around the 8 SSBO limitation on
         // some drivers (#373).
-        let z_buffer = core.allocator.get_buffer(z_buffer_id);
+        let z_buffer = core.allocator.get_general_buffer(z_buffer_id);
         let indirect_draw_params = [6, 0, 0, 0, 0, microlines_storage.count, 0, 0];
         core.device.upload_to_buffer::<u32>(&z_buffer,
                                             0,
@@ -233,10 +236,10 @@ impl<D> RendererD3D11<D> where D: Device {
         self.scene_buffers.upload(&mut core.allocator, &core.device, draw_segments, clip_segments);
     }
 
-    fn allocate_tiles(&mut self, core: &mut RendererCore<D>, tile_count: u32) -> BufferID {
-        core.allocator.allocate_buffer::<TileD3D11>(&core.device,
-                                                    tile_count as u64,
-                                                    BufferTag("TileD3D11"))
+    fn allocate_tiles(&mut self, core: &mut RendererCore<D>, tile_count: u32) -> GeneralBufferID {
+        core.allocator.allocate_general_buffer::<TileD3D11>(&core.device,
+                                                            tile_count as u64,
+                                                            BufferTag("TileD3D11"))
     }
 
     fn dice_segments(&mut self,
@@ -248,23 +251,24 @@ impl<D> RendererD3D11<D> where D: Device {
                      -> Option<MicrolinesBufferIDsD3D11> {
         let dice_program = &self.programs.dice_program;
 
-        let microlines_buffer_id =
-            core.allocator.allocate_buffer::<MicrolineD3D11>(&core.device,
-                                                             self.allocated_microline_count as u64,
-                                                             BufferTag("MicrolineD3D11"));
-        let dice_metadata_buffer_id =
-            core.allocator.allocate_buffer::<DiceMetadataD3D11>(&core.device,
-                                                                dice_metadata.len() as u64,
-                                                                BufferTag("DiceMetadataD3D11"));
-        let dice_indirect_draw_params_buffer_id =
-            core.allocator.allocate_buffer::<u32>(&core.device,
-                                                  8,
-                                                  BufferTag("DiceIndirectDrawParamsD3D11"));
+        let microlines_buffer_id = core.allocator.allocate_general_buffer::<MicrolineD3D11>(
+            &core.device,
+            self.allocated_microline_count as u64,
+            BufferTag("MicrolineD3D11"));
+        let dice_metadata_buffer_id = core.allocator.allocate_general_buffer::<DiceMetadataD3D11>(
+            &core.device,
+            dice_metadata.len() as u64,
+            BufferTag("DiceMetadataD3D11"));
+        let dice_indirect_draw_params_buffer_id = core.allocator.allocate_general_buffer::<u32>(
+            &core.device,
+            8,
+            BufferTag("DiceIndirectDrawParamsD3D11"));
 
-        let microlines_buffer = core.allocator.get_buffer(microlines_buffer_id);
-        let dice_metadata_storage_buffer = core.allocator.get_buffer(dice_metadata_buffer_id);
+        let microlines_buffer = core.allocator.get_general_buffer(microlines_buffer_id);
+        let dice_metadata_storage_buffer =
+            core.allocator.get_general_buffer(dice_metadata_buffer_id);
         let dice_indirect_draw_params_buffer =
-            core.allocator.get_buffer(dice_indirect_draw_params_buffer_id);
+            core.allocator.get_general_buffer(dice_indirect_draw_params_buffer_id);
 
         let scene_buffers = &self.scene_buffers;
         let scene_source_buffers = match path_source {
@@ -278,11 +282,10 @@ impl<D> RendererD3D11<D> where D: Device {
             ..
         } = *scene_source_buffers;
 
-        let points_buffer =
-            core.allocator.get_buffer(points_buffer_id.expect("Where's the points buffer?"));
-        let point_indices_buffer =
-            core.allocator
-                .get_buffer(point_indices_buffer_id.expect("Where's the point indices buffer?"));
+        let points_buffer = core.allocator.get_general_buffer(
+            points_buffer_id.expect("Where's the points buffer?"));
+        let point_indices_buffer = core.allocator.get_general_buffer(
+            point_indices_buffer_id.expect("Where's the point indices buffer?"));
 
         core.device.upload_to_buffer(dice_indirect_draw_params_buffer,
                                      0,
@@ -335,8 +338,8 @@ impl<D> RendererD3D11<D> where D: Device {
         let indirect_compute_params = core.device.recv_buffer(&indirect_compute_params_receiver);
         let indirect_compute_params: &[u32] = indirect_compute_params.as_slice_of().unwrap();
 
-        core.allocator.free_buffer(dice_metadata_buffer_id);
-        core.allocator.free_buffer(dice_indirect_draw_params_buffer_id);
+        core.allocator.free_general_buffer(dice_metadata_buffer_id);
+        core.allocator.free_general_buffer(dice_indirect_draw_params_buffer_id);
 
         let microline_count =
             indirect_compute_params[BIN_INDIRECT_DRAW_PARAMS_MICROLINE_COUNT_INDEX];
@@ -351,22 +354,22 @@ impl<D> RendererD3D11<D> where D: Device {
     fn draw_fills(&mut self,
                   core: &mut RendererCore<D>,
                   fill_storage_info: &FillBufferInfoD3D11,
-                  tiles_d3d11_buffer_id: BufferID,
-                  alpha_tiles_buffer_id: BufferID,
+                  tiles_d3d11_buffer_id: GeneralBufferID,
+                  alpha_tiles_buffer_id: GeneralBufferID,
                   propagate_tiles_info: &PropagateTilesInfoD3D11) {
         let &FillBufferInfoD3D11 { fill_vertex_buffer_id } = fill_storage_info;
         let &PropagateTilesInfoD3D11 { ref alpha_tile_range } = propagate_tiles_info;
 
         let fill_program = &self.programs.fill_program;
-        let fill_vertex_buffer = core.allocator.get_buffer(fill_vertex_buffer_id);
+        let fill_vertex_buffer = core.allocator.get_general_buffer(fill_vertex_buffer_id);
 
         let mask_storage = core.mask_storage.as_ref().expect("Where's the mask storage?");
         let mask_framebuffer_id = mask_storage.framebuffer_id;
         let mask_framebuffer = core.allocator.get_framebuffer(mask_framebuffer_id);
         let image_texture = core.device.framebuffer_texture(mask_framebuffer);
 
-        let tiles_d3d11_buffer = core.allocator.get_buffer(tiles_d3d11_buffer_id);
-        let alpha_tiles_buffer = core.allocator.get_buffer(alpha_tiles_buffer_id);
+        let tiles_d3d11_buffer = core.allocator.get_general_buffer(tiles_d3d11_buffer_id);
+        let alpha_tiles_buffer = core.allocator.get_general_buffer(alpha_tiles_buffer_id);
 
         let area_lut_texture = core.allocator.get_texture(core.area_lut_texture_id);
 
@@ -491,7 +494,7 @@ impl<D> RendererD3D11<D> where D: Device {
         let fill_buffer_info =
             fill_buffer_info.expect("Ran out of space for fills when binning!");
 
-        core.allocator.free_buffer(microlines_storage.buffer_id);
+        core.allocator.free_general_buffer(microlines_storage.buffer_id);
 
         // TODO(pcwalton): If we run out of space for alpha tile indices, propagate
         // multiple times.
@@ -508,7 +511,7 @@ impl<D> RendererD3D11<D> where D: Device {
                                  &propagate_metadata_buffer_ids,
                                  clip_buffer_ids.as_ref());
 
-        core.allocator.free_buffer(propagate_metadata_buffer_ids.backdrops);
+        core.allocator.free_general_buffer(propagate_metadata_buffer_ids.backdrops);
 
         // FIXME(pcwalton): Don't unconditionally pass true for copying here.
         core.reallocate_alpha_tile_pages_if_necessary(true);
@@ -518,8 +521,8 @@ impl<D> RendererD3D11<D> where D: Device {
                         alpha_tiles_buffer_id,
                         &propagate_tiles_info);
 
-        core.allocator.free_buffer(fill_buffer_info.fill_vertex_buffer_id);
-        core.allocator.free_buffer(alpha_tiles_buffer_id);
+        core.allocator.free_general_buffer(fill_buffer_info.fill_vertex_buffer_id);
+        core.allocator.free_general_buffer(alpha_tiles_buffer_id);
 
         // FIXME(pcwalton): This seems like the wrong place to do this...
         self.sort_tiles(core, tiles_d3d11_buffer_id, first_tile_map_buffer_id, z_buffer_id);
@@ -537,35 +540,36 @@ impl<D> RendererD3D11<D> where D: Device {
     fn propagate_tiles(&mut self,
                        core: &mut RendererCore<D>,
                        column_count: u32,
-                       tiles_d3d11_buffer_id: BufferID,
-                       z_buffer_id: BufferID,
-                       first_tile_map_buffer_id: BufferID,
-                       alpha_tiles_buffer_id: BufferID,
+                       tiles_d3d11_buffer_id: GeneralBufferID,
+                       z_buffer_id: GeneralBufferID,
+                       first_tile_map_buffer_id: GeneralBufferID,
+                       alpha_tiles_buffer_id: GeneralBufferID,
                        propagate_metadata_buffer_ids: &PropagateMetadataBufferIDsD3D11,
                        clip_buffer_ids: Option<&ClipBufferIDs>)
                        -> PropagateTilesInfoD3D11 {
         let propagate_program = &self.programs.propagate_program;
 
-        let tiles_d3d11_buffer = core.allocator.get_buffer(tiles_d3d11_buffer_id);
+        let tiles_d3d11_buffer = core.allocator.get_general_buffer(tiles_d3d11_buffer_id);
         let propagate_metadata_storage_buffer =
-            core.allocator.get_buffer(propagate_metadata_buffer_ids.propagate_metadata);
+            core.allocator.get_general_buffer(propagate_metadata_buffer_ids.propagate_metadata);
         let backdrops_storage_buffer =
-            core.allocator.get_buffer(propagate_metadata_buffer_ids.backdrops);
+            core.allocator.get_general_buffer(propagate_metadata_buffer_ids.backdrops);
 
         // TODO(pcwalton): Zero out the Z-buffer on GPU?
-        let z_buffer = core.allocator.get_buffer(z_buffer_id);
+        let z_buffer = core.allocator.get_general_buffer(z_buffer_id);
         let z_buffer_size = core.tile_size();
         let tile_area = z_buffer_size.area() as usize;
         core.device.upload_to_buffer(z_buffer, 0, &vec![0i32; tile_area], BufferTarget::Storage);
 
         // TODO(pcwalton): Initialize the first tiles buffer on GPU?
-        let first_tile_map_storage_buffer = core.allocator.get_buffer(first_tile_map_buffer_id);
+        let first_tile_map_storage_buffer = core.allocator
+                                                .get_general_buffer(first_tile_map_buffer_id);
         core.device.upload_to_buffer::<FirstTileD3D11>(&first_tile_map_storage_buffer,
                                                        0,
                                                        &vec![FirstTileD3D11::default(); tile_area],
                                                        BufferTarget::Storage);
 
-        let alpha_tiles_storage_buffer = core.allocator.get_buffer(alpha_tiles_buffer_id);
+        let alpha_tiles_storage_buffer = core.allocator.get_general_buffer(alpha_tiles_buffer_id);
 
         let mut storage_buffers = vec![
             (&propagate_program.draw_metadata_storage_buffer, propagate_metadata_storage_buffer),
@@ -580,8 +584,9 @@ impl<D> RendererD3D11<D> where D: Device {
             Some(clip_buffer_ids) => {
                 let clip_metadata_buffer_id =
                     clip_buffer_ids.metadata.expect("Where's the clip metadata storage?");
-                let clip_metadata_buffer = core.allocator.get_buffer(clip_metadata_buffer_id);
-                let clip_tile_buffer = core.allocator.get_buffer(clip_buffer_ids.tiles);
+                let clip_metadata_buffer = core.allocator
+                                               .get_general_buffer(clip_metadata_buffer_id);
+                let clip_tile_buffer = core.allocator.get_general_buffer(clip_buffer_ids.tiles);
                 storage_buffers.push((&propagate_program.clip_metadata_storage_buffer,
                                     clip_metadata_buffer));
                 storage_buffers.push((&propagate_program.clip_tiles_storage_buffer,
@@ -641,14 +646,14 @@ impl<D> RendererD3D11<D> where D: Device {
 
     fn sort_tiles(&mut self,
                   core: &mut RendererCore<D>,
-                  tiles_d3d11_buffer_id: BufferID,
-                  first_tile_map_buffer_id: BufferID,
-                  z_buffer_id: BufferID) {
+                  tiles_d3d11_buffer_id: GeneralBufferID,
+                  first_tile_map_buffer_id: GeneralBufferID,
+                  z_buffer_id: GeneralBufferID) {
         let sort_program = &self.programs.sort_program;
 
-        let tiles_d3d11_buffer = core.allocator.get_buffer(tiles_d3d11_buffer_id);
-        let first_tile_map_buffer = core.allocator.get_buffer(first_tile_map_buffer_id);
-        let z_buffer = core.allocator.get_buffer(z_buffer_id);
+        let tiles_d3d11_buffer = core.allocator.get_general_buffer(tiles_d3d11_buffer_id);
+        let first_tile_map_buffer = core.allocator.get_general_buffer(first_tile_map_buffer_id);
+        let z_buffer = core.allocator.get_general_buffer(z_buffer_id);
 
         let tile_count = core.framebuffer_tile_size().area();
 
@@ -677,30 +682,32 @@ impl<D> RendererD3D11<D> where D: Device {
         core.current_timer.as_mut().unwrap().push_query(TimeCategory::Other, timer_query);
     }
 
-    fn allocate_first_tile_map(&mut self, core: &mut RendererCore<D>) -> BufferID {
-        core.allocator.allocate_buffer::<FirstTileD3D11>(&core.device,
-                                                         core.tile_size().area() as u64,
-                                                         BufferTag("FirstTileD3D11"))
+    fn allocate_first_tile_map(&mut self, core: &mut RendererCore<D>) -> GeneralBufferID {
+        core.allocator.allocate_general_buffer::<FirstTileD3D11>(&core.device,
+                                                                 core.tile_size().area() as u64,
+                                                                 BufferTag("FirstTileD3D11"))
     }
 
     fn allocate_alpha_tile_info(&mut self, core: &mut RendererCore<D>, index_count: u32)
-                                -> BufferID {
-        core.allocator.allocate_buffer::<AlphaTileD3D11>(&core.device,
-                                                         index_count as u64,
-                                                         BufferTag("AlphaTileD3D11"))
+                                -> GeneralBufferID {
+        core.allocator.allocate_general_buffer::<AlphaTileD3D11>(&core.device,
+                                                                 index_count as u64,
+                                                                 BufferTag("AlphaTileD3D11"))
     }
 
-    fn allocate_z_buffer(&mut self, core: &mut RendererCore<D>) -> BufferID {
+    fn allocate_z_buffer(&mut self, core: &mut RendererCore<D>) -> GeneralBufferID {
         // This includes the fill indirect draw params because some drivers limit the number of
         // SSBOs to 8 (#373).
         let size = core.tile_size().area() as u64 + FILL_INDIRECT_DRAW_PARAMS_SIZE as u64;
-        core.allocator.allocate_buffer::<i32>( &core.device, size, BufferTag("ZBufferD3D11"))
+        core.allocator.allocate_general_buffer::<i32>(&core.device,
+                                                      size,
+                                                      BufferTag("ZBufferD3D11"))
     }
 
     pub(crate) fn draw_tiles(&mut self,
                              core: &mut RendererCore<D>,
-                             tiles_d3d11_buffer_id: BufferID,
-                             first_tile_map_buffer_id: BufferID,
+                             tiles_d3d11_buffer_id: GeneralBufferID,
+                             first_tile_map_buffer_id: GeneralBufferID,
                              color_texture_0: Option<TileBatchTexture>) {
         let timer_query = core.timer_query_cache.start_timing_draw_call(&core.device,
                                                                         &core.options);
@@ -741,8 +748,9 @@ impl<D> RendererD3D11<D> where D: Device {
             }
         }
 
-        let tiles_d3d11_buffer = core.allocator.get_buffer(tiles_d3d11_buffer_id);
-        let first_tile_map_storage_buffer = core.allocator.get_buffer(first_tile_map_buffer_id);
+        let tiles_d3d11_buffer = core.allocator.get_general_buffer(tiles_d3d11_buffer_id);
+        let first_tile_map_storage_buffer = core.allocator
+                                                .get_general_buffer(first_tile_map_buffer_id);
 
         let framebuffer_tile_size = core.framebuffer_tile_size().0;
         let compute_dimensions = ComputeDimensions {
@@ -775,10 +783,10 @@ impl<D> RendererD3D11<D> where D: Device {
 
     fn free_tile_batch_buffers(&mut self, core: &mut RendererCore<D>) {
         for (_, tile_batch_info) in self.tile_batch_info.drain() {
-            core.allocator.free_buffer(tile_batch_info.z_buffer_id);
-            core.allocator.free_buffer(tile_batch_info.tiles_d3d11_buffer_id);
-            core.allocator.free_buffer(tile_batch_info.propagate_metadata_buffer_id);
-            core.allocator.free_buffer(tile_batch_info.first_tile_map_buffer_id);
+            core.allocator.free_general_buffer(tile_batch_info.z_buffer_id);
+            core.allocator.free_general_buffer(tile_batch_info.tiles_d3d11_buffer_id);
+            core.allocator.free_general_buffer(tile_batch_info.propagate_metadata_buffer_id);
+            core.allocator.free_general_buffer(tile_batch_info.first_tile_map_buffer_id);
         }
     }
 }
@@ -788,32 +796,32 @@ impl<D> RendererD3D11<D> where D: Device {
 #[derive(Clone)]
 struct TileBatchInfoD3D11 {
     tile_count: u32,
-    z_buffer_id: BufferID,
-    tiles_d3d11_buffer_id: BufferID,
-    propagate_metadata_buffer_id: BufferID,
-    first_tile_map_buffer_id: BufferID,
+    z_buffer_id: GeneralBufferID,
+    tiles_d3d11_buffer_id: GeneralBufferID,
+    propagate_metadata_buffer_id: GeneralBufferID,
+    first_tile_map_buffer_id: GeneralBufferID,
 }
 
 #[derive(Clone)]
 struct FillBufferInfoD3D11 {
-    fill_vertex_buffer_id: BufferID,
+    fill_vertex_buffer_id: GeneralBufferID,
 }
 
 #[derive(Debug)]
 struct PropagateMetadataBufferIDsD3D11 {
-    propagate_metadata: BufferID,
-    backdrops: BufferID,
+    propagate_metadata: GeneralBufferID,
+    backdrops: GeneralBufferID,
 }
 
 struct MicrolinesBufferIDsD3D11 {
-    buffer_id: BufferID,
+    buffer_id: GeneralBufferID,
     count: u32,
 }
 
 #[derive(Clone, Debug)]
 struct ClipBufferIDs {
-    metadata: Option<BufferID>,
-    tiles: BufferID,
+    metadata: Option<GeneralBufferID>,
+    tiles: GeneralBufferID,
 }
 
 struct SceneBuffers {
@@ -822,9 +830,9 @@ struct SceneBuffers {
 }
 
 struct SceneSourceBuffers {
-    points_buffer: Option<BufferID>,
+    points_buffer: Option<GeneralBufferID>,
     points_capacity: u32,
-    point_indices_buffer: Option<BufferID>,
+    point_indices_buffer: Option<GeneralBufferID>,
     point_indices_count: u32,
     point_indices_capacity: u32,
 }
@@ -870,23 +878,24 @@ impl SceneSourceBuffers {
         let needed_point_indices_capacity = (segments.indices.len() as u32).next_power_of_two();
         if self.points_capacity < needed_points_capacity {
             self.points_buffer =
-                Some(allocator.allocate_buffer::<Vector2F>(device,
-                                                           needed_points_capacity as u64,
-                                                           BufferTag("PointsD3D11")));
+                Some(allocator.allocate_general_buffer::<Vector2F>(device,
+                                                                   needed_points_capacity as u64,
+                                                                   BufferTag("PointsD3D11")));
             self.points_capacity = needed_points_capacity;
         }
         if self.point_indices_capacity < needed_point_indices_capacity {
-            self.point_indices_buffer = Some(allocator.allocate_buffer::<SegmentIndicesD3D11>(
-                device,
-                needed_point_indices_capacity as u64,
-                BufferTag("PointIndicesD3D11")));
+            self.point_indices_buffer =
+                Some(allocator.allocate_general_buffer::<SegmentIndicesD3D11>(
+                    device,
+                    needed_point_indices_capacity as u64,
+                    BufferTag("PointIndicesD3D11")));
             self.point_indices_capacity = needed_point_indices_capacity;
         }
-        device.upload_to_buffer(allocator.get_buffer(self.points_buffer.unwrap()),
+        device.upload_to_buffer(allocator.get_general_buffer(self.points_buffer.unwrap()),
                                 0,
                                 &segments.points,
                                 BufferTarget::Storage);
-        device.upload_to_buffer(allocator.get_buffer(self.point_indices_buffer.unwrap()),
+        device.upload_to_buffer(allocator.get_general_buffer(self.point_indices_buffer.unwrap()),
                                 0,
                                 &segments.indices,
                                 BufferTarget::Storage);
diff --git a/renderer/src/gpu/d3d9/renderer.rs b/renderer/src/gpu/d3d9/renderer.rs
index 57bf2c36..5c134e97 100644
--- a/renderer/src/gpu/d3d9/renderer.rs
+++ b/renderer/src/gpu/d3d9/renderer.rs
@@ -24,8 +24,8 @@ use pathfinder_content::effects::BlendMode;
 use pathfinder_geometry::rect::RectI;
 use pathfinder_geometry::transform3d::Transform4F;
 use pathfinder_geometry::vector::{Vector2I, Vector4F, vec2i};
-use pathfinder_gpu::allocator::{BufferID, BufferTag, FramebufferID, FramebufferTag};
-use pathfinder_gpu::allocator::{TextureID, TextureTag};
+use pathfinder_gpu::allocator::{BufferTag, FramebufferID, FramebufferTag, GeneralBufferID};
+use pathfinder_gpu::allocator::{IndexBufferID, TextureID, TextureTag};
 use pathfinder_gpu::{BlendFactor, BlendState, BufferTarget, ClearOps, Device, Primitive};
 use pathfinder_gpu::{RenderOptions, RenderState, RenderTarget, StencilFunc, StencilState};
 use pathfinder_gpu::{TextureDataRef, TextureFormat, UniformData};
@@ -38,7 +38,7 @@ const MAX_FILLS_PER_BATCH: usize = 0x10000;
 pub(crate) struct RendererD3D9<D> where D: Device {
     // Basic data
     programs: ProgramsD3D9<D>,
-    quads_vertex_indices_buffer_id: Option<BufferID>,
+    quads_vertex_indices_buffer_id: Option<IndexBufferID>,
     quads_vertex_indices_length: usize,
 
     // Fills.
@@ -79,7 +79,7 @@ impl<D> RendererD3D9<D> where D: Device {
         if !batch.clips.is_empty() {
             let clip_buffer_info = self.upload_clip_tiles(core, &batch.clips);
             self.clip_tiles(core, &clip_buffer_info);
-            core.allocator.free_buffer(clip_buffer_info.clip_buffer_id);
+            core.allocator.free_general_buffer(clip_buffer_info.clip_buffer_id);
         }
 
         let tile_buffer = self.upload_tiles(core, &batch.tiles);
@@ -93,16 +93,16 @@ impl<D> RendererD3D9<D> where D: Device {
                         z_buffer_texture_id);
 
         core.allocator.free_texture(z_buffer_texture_id);
-        core.allocator.free_buffer(tile_buffer.tile_vertex_buffer_id);
+        core.allocator.free_general_buffer(tile_buffer.tile_vertex_buffer_id);
     }
 
     fn upload_tiles(&mut self, core: &mut RendererCore<D>, tiles: &[TileObjectPrimitive])
                     -> TileBufferD3D9 {
         let tile_vertex_buffer_id =
-            core.allocator.allocate_buffer::<TileObjectPrimitive>(&core.device,
-                                                                  tiles.len() as u64,
-                                                                  BufferTag("TileD3D9"));
-        let tile_vertex_buffer = &core.allocator.get_buffer(tile_vertex_buffer_id);
+            core.allocator.allocate_general_buffer::<TileObjectPrimitive>(&core.device,
+                                                                          tiles.len() as u64,
+                                                                          BufferTag("TileD3D9"));
+        let tile_vertex_buffer = &core.allocator.get_general_buffer(tile_vertex_buffer_id);
         core.device.upload_to_buffer(tile_vertex_buffer, 0, tiles, BufferTarget::Vertex);
         self.ensure_index_buffer(core, tiles.len());
 
@@ -126,14 +126,14 @@ impl<D> RendererD3D9<D> where D: Device {
         }
 
         if let Some(quads_vertex_indices_buffer_id) = self.quads_vertex_indices_buffer_id.take() {
-            core.allocator.free_buffer(quads_vertex_indices_buffer_id);
+            core.allocator.free_index_buffer(quads_vertex_indices_buffer_id);
         }
         let quads_vertex_indices_buffer_id =
-            core.allocator.allocate_buffer::<u32>(&core.device,
-                                                  indices.len() as u64,
-                                                  BufferTag("QuadsVertexIndicesD3D9"));
+            core.allocator.allocate_index_buffer::<u32>(&core.device,
+                                                        indices.len() as u64,
+                                                        BufferTag("QuadsVertexIndicesD3D9"));
         let quads_vertex_indices_buffer =
-            core.allocator.get_buffer(quads_vertex_indices_buffer_id);
+            core.allocator.get_index_buffer(quads_vertex_indices_buffer_id);
         core.device.upload_to_buffer(quads_vertex_indices_buffer,
                                      0,
                                      &indices,
@@ -175,17 +175,18 @@ impl<D> RendererD3D9<D> where D: Device {
 
         let fill_storage_info = self.upload_buffered_fills(core);
         self.draw_fills(core, fill_storage_info.fill_buffer_id, fill_storage_info.fill_count);
-        core.allocator.free_buffer(fill_storage_info.fill_buffer_id);
+        core.allocator.free_general_buffer(fill_storage_info.fill_buffer_id);
     }
 
     fn upload_buffered_fills(&mut self, core: &mut RendererCore<D>) -> FillBufferInfoD3D9 {
         let buffered_fills = &mut self.buffered_fills;
         debug_assert!(!buffered_fills.is_empty());
 
-        let fill_buffer_id = core.allocator.allocate_buffer::<Fill>(&core.device,
-                                                                    MAX_FILLS_PER_BATCH as u64,
-                                                                    BufferTag("Fill"));
-        let fill_vertex_buffer = core.allocator.get_buffer(fill_buffer_id);
+        let fill_buffer_id = core.allocator
+                                 .allocate_general_buffer::<Fill>(&core.device,
+                                                                  MAX_FILLS_PER_BATCH as u64,
+                                                                  BufferTag("Fill"));
+        let fill_vertex_buffer = core.allocator.get_general_buffer(fill_buffer_id);
         debug_assert!(buffered_fills.len() <= u32::MAX as usize);
         core.device.upload_to_buffer(fill_vertex_buffer, 0, &buffered_fills, BufferTarget::Vertex);
 
@@ -197,15 +198,15 @@ impl<D> RendererD3D9<D> where D: Device {
 
     fn draw_fills(&mut self,
                   core: &mut RendererCore<D>,
-                  fill_buffer_id: BufferID,
+                  fill_buffer_id: GeneralBufferID,
                   fill_count: u32) {
         let fill_raster_program = &self.programs.fill_program;
 
-        let fill_vertex_buffer = core.allocator.get_buffer(fill_buffer_id);
-        let quad_vertex_positions_buffer = core.allocator
-                                               .get_buffer(core.quad_vertex_positions_buffer_id);
+        let fill_vertex_buffer = core.allocator.get_general_buffer(fill_buffer_id);
+        let quad_vertex_positions_buffer =
+            core.allocator.get_general_buffer(core.quad_vertex_positions_buffer_id);
         let quad_vertex_indices_buffer = core.allocator
-                                             .get_buffer(core.quad_vertex_indices_buffer_id);
+                                             .get_index_buffer(core.quad_vertex_indices_buffer_id);
 
         let area_lut_texture = core.allocator.get_texture(core.area_lut_texture_id);
 
@@ -278,11 +279,12 @@ impl<D> RendererD3D9<D> where D: Device {
         let mask_texture = core.device.framebuffer_texture(mask_framebuffer);
         let mask_texture_size = core.device.texture_size(&mask_texture);
 
-        let clip_vertex_buffer = core.allocator.get_buffer(clip_buffer_info.clip_buffer_id);
-        let quad_vertex_positions_buffer = core.allocator
-                                               .get_buffer(core.quad_vertex_positions_buffer_id);
+        let clip_vertex_buffer = core.allocator
+                                     .get_general_buffer(clip_buffer_info.clip_buffer_id);
+        let quad_vertex_positions_buffer =
+            core.allocator.get_general_buffer(core.quad_vertex_positions_buffer_id);
         let quad_vertex_indices_buffer = core.allocator
-                                             .get_buffer(core.quad_vertex_indices_buffer_id);
+                                             .get_index_buffer(core.quad_vertex_indices_buffer_id);
 
         let tile_clip_copy_vertex_array =   
             ClipTileCopyVertexArrayD3D9::new(&core.device,
@@ -372,10 +374,10 @@ impl<D> RendererD3D9<D> where D: Device {
 
     // Uploads clip tiles from CPU to GPU.
     fn upload_clip_tiles(&mut self, core: &mut RendererCore<D>, clips: &[Clip]) -> ClipBufferInfo {
-        let clip_buffer_id = core.allocator.allocate_buffer::<Clip>(&core.device,
-                                                                    clips.len() as u64,
-                                                                    BufferTag("ClipD3D9"));
-        let clip_buffer = core.allocator.get_buffer(clip_buffer_id);
+        let clip_buffer_id = core.allocator.allocate_general_buffer::<Clip>(&core.device,
+                                                                            clips.len() as u64,
+                                                                            BufferTag("ClipD3D9"));
+        let clip_buffer = core.allocator.get_general_buffer(clip_buffer_id);
         core.device.upload_to_buffer(clip_buffer, 0, clips, BufferTarget::Vertex);
         ClipBufferInfo { clip_buffer_id, clip_count: clips.len() as u32 }
     }
@@ -383,7 +385,7 @@ impl<D> RendererD3D9<D> where D: Device {
     fn draw_tiles(&mut self,
                   core: &mut RendererCore<D>,
                   tile_count: u32,
-                  tile_vertex_buffer_id: BufferID,
+                  tile_vertex_buffer_id: GeneralBufferID,
                   color_texture_0: Option<TileBatchTexture>,
                   blend_mode: BlendMode,
                   z_buffer_texture_id: TextureID) {
@@ -408,11 +410,11 @@ impl<D> RendererD3D9<D> where D: Device {
 
         let tile_raster_program = &self.programs.tile_program;
 
-        let tile_vertex_buffer = core.allocator.get_buffer(tile_vertex_buffer_id);
-        let quad_vertex_positions_buffer = core.allocator
-                                               .get_buffer(core.quad_vertex_positions_buffer_id);
+        let tile_vertex_buffer = core.allocator.get_general_buffer(tile_vertex_buffer_id);
+        let quad_vertex_positions_buffer =
+            core.allocator.get_general_buffer(core.quad_vertex_positions_buffer_id);
         let quad_vertex_indices_buffer = core.allocator
-                                             .get_buffer(core.quad_vertex_indices_buffer_id);
+                                             .get_index_buffer(core.quad_vertex_indices_buffer_id);
         let dest_blend_framebuffer = core.allocator
                                          .get_framebuffer(self.dest_blend_framebuffer_id);
 
@@ -467,7 +469,7 @@ impl<D> RendererD3D9<D> where D: Device {
     fn copy_alpha_tiles_to_dest_blend_texture(&mut self,
                                               core: &mut RendererCore<D>,
                                               tile_count: u32,
-                                              vertex_buffer_id: BufferID) {
+                                              vertex_buffer_id: GeneralBufferID) {
         let draw_viewport = core.draw_viewport();
 
         let mut textures = vec![];
@@ -491,8 +493,8 @@ impl<D> RendererD3D9<D> where D: Device {
         let quads_vertex_indices_buffer_id = self.quads_vertex_indices_buffer_id
                                                  .expect("Where's the quads vertex buffer?");
         let quads_vertex_indices_buffer = core.allocator
-                                              .get_buffer(quads_vertex_indices_buffer_id);
-        let vertex_buffer = core.allocator.get_buffer(vertex_buffer_id);
+                                              .get_index_buffer(quads_vertex_indices_buffer_id);
+        let vertex_buffer = core.allocator.get_general_buffer(vertex_buffer_id);
 
         let tile_copy_vertex_array = CopyTileVertexArray::new(&core.device,
                                                               &self.programs.tile_copy_program,
@@ -556,21 +558,21 @@ impl<D> RendererD3D9<D> where D: Device {
 #[derive(Clone)]
 pub(crate) struct TileBatchInfoD3D9 {
     pub(crate) tile_count: u32,
-    pub(crate) z_buffer_id: BufferID,
-    tile_vertex_buffer_id: BufferID,
+    pub(crate) z_buffer_id: GeneralBufferID,
+    tile_vertex_buffer_id: GeneralBufferID,
 }
 
 #[derive(Clone)]
 struct FillBufferInfoD3D9 {
-    fill_buffer_id: BufferID,
+    fill_buffer_id: GeneralBufferID,
     fill_count: u32,
 }
 
 struct TileBufferD3D9 {
-    tile_vertex_buffer_id: BufferID,
+    tile_vertex_buffer_id: GeneralBufferID,
 }
 
 struct ClipBufferInfo {
-    clip_buffer_id: BufferID,
+    clip_buffer_id: GeneralBufferID,
     clip_count: u32,
 }
diff --git a/renderer/src/gpu/renderer.rs b/renderer/src/gpu/renderer.rs
index 2fd72360..01a54912 100644
--- a/renderer/src/gpu/renderer.rs
+++ b/renderer/src/gpu/renderer.rs
@@ -29,8 +29,8 @@ use pathfinder_geometry::rect::{RectF, RectI};
 use pathfinder_geometry::transform3d::Transform4F;
 use pathfinder_geometry::util;
 use pathfinder_geometry::vector::{Vector2F, Vector2I, Vector4F, vec2f, vec2i};
-use pathfinder_gpu::allocator::{BufferID, BufferTag, FramebufferID, FramebufferTag};
-use pathfinder_gpu::allocator::{GPUMemoryAllocator, TextureID, TextureTag};
+use pathfinder_gpu::allocator::{BufferTag, FramebufferID, FramebufferTag, GeneralBufferID};
+use pathfinder_gpu::allocator::{GPUMemoryAllocator, IndexBufferID, TextureID, TextureTag};
 use pathfinder_gpu::{BufferData, BufferTarget, ClearOps, DepthFunc, DepthState, Device, Primitive};
 use pathfinder_gpu::{RenderOptions, RenderState, RenderTarget, StencilFunc, StencilState};
 use pathfinder_gpu::{TextureBinding, TextureDataRef, TextureFormat, UniformBinding, UniformData};
@@ -111,8 +111,8 @@ pub(crate) struct RendererCore<D> where D: Device {
     pub(crate) vertex_arrays: VertexArraysCore<D>,
 
     // Read-only static core resources
-    pub(crate) quad_vertex_positions_buffer_id: BufferID,
-    pub(crate) quad_vertex_indices_buffer_id: BufferID,
+    pub(crate) quad_vertex_positions_buffer_id: GeneralBufferID,
+    pub(crate) quad_vertex_indices_buffer_id: IndexBufferID,
     pub(crate) area_lut_texture_id: TextureID,
     pub(crate) gamma_lut_texture_id: TextureID,
 
@@ -154,18 +154,18 @@ impl<D> Renderer<D> where D: Device {
         device.begin_commands();
 
         let quad_vertex_positions_buffer_id =
-            allocator.allocate_buffer::<u16>(&device,
-                                             QUAD_VERTEX_POSITIONS.len() as u64,
-                                             BufferTag("QuadVertexPositions"));
-        device.upload_to_buffer(allocator.get_buffer(quad_vertex_positions_buffer_id),
+            allocator.allocate_general_buffer::<u16>(&device,
+                                                     QUAD_VERTEX_POSITIONS.len() as u64,
+                                                     BufferTag("QuadVertexPositions"));
+        device.upload_to_buffer(allocator.get_general_buffer(quad_vertex_positions_buffer_id),
                                 0,
                                 &QUAD_VERTEX_POSITIONS,
                                 BufferTarget::Vertex);
         let quad_vertex_indices_buffer_id =
-            allocator.allocate_buffer::<u32>(&device,
-                                             QUAD_VERTEX_INDICES.len() as u64,
-                                             BufferTag("QuadVertexIndices"));
-        device.upload_to_buffer(allocator.get_buffer(quad_vertex_indices_buffer_id),
+            allocator.allocate_index_buffer::<u32>(&device,
+                                                   QUAD_VERTEX_INDICES.len() as u64,
+                                                   BufferTag("QuadVertexIndices"));
+        device.upload_to_buffer(allocator.get_index_buffer(quad_vertex_indices_buffer_id),
                                 0,
                                 &QUAD_VERTEX_INDICES,
                                 BufferTarget::Index);
@@ -206,8 +206,8 @@ impl<D> Renderer<D> where D: Device {
         let core_vertex_arrays =
              VertexArraysCore::new(&device,
                                    &core_programs,
-                                   allocator.get_buffer(quad_vertex_positions_buffer_id),
-                                   allocator.get_buffer(quad_vertex_indices_buffer_id));
+                                   allocator.get_general_buffer(quad_vertex_positions_buffer_id),
+                                   allocator.get_index_buffer(quad_vertex_indices_buffer_id));
 
         let mut core = RendererCore {
             device,
@@ -508,12 +508,12 @@ impl<D> Renderer<D> where D: Device {
 
     #[inline]
     pub fn quad_vertex_positions_buffer(&self) -> &D::Buffer {
-        self.core.allocator.get_buffer(self.core.quad_vertex_positions_buffer_id)
+        self.core.allocator.get_general_buffer(self.core.quad_vertex_positions_buffer_id)
     }
 
     #[inline]
     pub fn quad_vertex_indices_buffer(&self) -> &D::Buffer {
-        self.core.allocator.get_buffer(self.core.quad_vertex_indices_buffer_id)
+        self.core.allocator.get_index_buffer(self.core.quad_vertex_indices_buffer_id)
     }
 
     fn allocate_pattern_texture_page(&mut self,
@@ -1146,11 +1146,13 @@ impl<D> Frame<D> where D: Device {
            clear_program: &ClearProgram<D>,
            reprojection_program: &ReprojectionProgram<D>,
            stencil_program: &StencilProgram<D>,
-           quad_vertex_positions_buffer_id: BufferID,
-           quad_vertex_indices_buffer_id: BufferID)
+           quad_vertex_positions_buffer_id: GeneralBufferID,
+           quad_vertex_indices_buffer_id: IndexBufferID)
            -> Frame<D> {
-        let quad_vertex_positions_buffer = allocator.get_buffer(quad_vertex_positions_buffer_id);
-        let quad_vertex_indices_buffer = allocator.get_buffer(quad_vertex_indices_buffer_id);
+        let quad_vertex_positions_buffer =
+            allocator.get_general_buffer(quad_vertex_positions_buffer_id);
+        let quad_vertex_indices_buffer =
+            allocator.get_index_buffer(quad_vertex_indices_buffer_id);
 
         let blit_vertex_array = BlitVertexArray::new(device,
                                                      &blit_program,
diff --git a/renderer/src/scene.rs b/renderer/src/scene.rs
index d536fe01..693abb13 100644
--- a/renderer/src/scene.rs
+++ b/renderer/src/scene.rs
@@ -13,6 +13,8 @@
 use crate::builder::SceneBuilder;
 use crate::concurrent::executor::Executor;
 use crate::gpu::options::RendererLevel;
+use crate::gpu::renderer::Renderer;
+use crate::gpu_data::RenderCommand;
 use crate::options::{BuildOptions, PreparedBuildOptions};
 use crate::options::{PreparedRenderTransform, RenderCommandListener};
 use crate::paint::{MergedPaletteInfo, Paint, PaintId, PaintInfo, Palette};
@@ -23,8 +25,11 @@ use pathfinder_content::render_target::RenderTargetId;
 use pathfinder_geometry::rect::RectF;
 use pathfinder_geometry::transform2d::Transform2F;
 use pathfinder_geometry::vector::{Vector2I, vec2f};
+use pathfinder_gpu::Device;
+use std::mem;
 use std::ops::Range;
 use std::sync::atomic::{AtomicUsize, Ordering};
+use std::sync::{Arc, Mutex};
 use std::u64;
 
 static NEXT_SCENE_ID: AtomicUsize = AtomicUsize::new(0);
@@ -289,6 +294,37 @@ impl Scene {
     pub fn epoch(&self) -> SceneEpoch {
         self.epoch
     }
+
+    /// A convenience method to build a scene and accumulate commands into a vector.
+    pub fn build_into_vector<D, E>(&mut self,
+                                   renderer: &mut Renderer<D>,
+                                   build_options: BuildOptions,
+                                   executor: E)
+                                   -> Vec<RenderCommand>
+                                   where D: Device, E: Executor {
+        let commands = Arc::new(Mutex::new(vec![]));
+        let commands_for_listener = commands.clone();
+        let listener = RenderCommandListener::new(Box::new(move |command| {
+            commands_for_listener.lock().unwrap().push(command)
+        }));
+        let mut sink = SceneSink::new(listener, renderer.mode().level);
+        self.build(build_options, &mut sink, &executor);
+        let mut commands = commands.lock().unwrap();
+        mem::replace(&mut *commands, vec![])
+    }
+
+    /// A convenience method to build a scene and send the resulting commands to the given
+    /// renderer.
+    pub fn build_and_render<D, E>(&mut self,
+                                  renderer: &mut Renderer<D>,
+                                  build_options: BuildOptions,
+                                  executor: E)
+                                  where D: Device, E: Executor {
+        let commands = self.build_into_vector(renderer, build_options, executor);
+        renderer.begin_scene();
+        commands.into_iter().for_each(|command| renderer.render_command(&command));
+        renderer.end_scene();
+    }
 }
 
 pub struct SceneSink<'a> {
diff --git a/renderer/src/tiles.rs b/renderer/src/tiles.rs
index e1a1bc61..aa5b80df 100644
--- a/renderer/src/tiles.rs
+++ b/renderer/src/tiles.rs
@@ -11,7 +11,6 @@
 use crate::gpu_data::{TILE_CTRL_MASK_0_SHIFT, TILE_CTRL_MASK_EVEN_ODD};
 use crate::gpu_data::{TILE_CTRL_MASK_WINDING, TileObjectPrimitive};
 use crate::paint::PaintId;
-use crate::scene::ClipPathId;
 use pathfinder_content::effects::BlendMode;
 use pathfinder_content::fill::FillRule;
 use pathfinder_geometry::rect::{RectF, RectI};
diff --git a/ui/src/lib.rs b/ui/src/lib.rs
index c9558cb5..dc4bf940 100644
--- a/ui/src/lib.rs
+++ b/ui/src/lib.rs
@@ -177,15 +177,15 @@ impl<D> UIPresenter<D> where D: Device {
                                          color: ColorU,
                                          filled: bool) {
         let vertex_buffer_id =
-            allocator.allocate_buffer::<DebugSolidVertex>(device,
-                                                          vertex_data.len() as u64,
-                                                          BufferTag("SolidVertexDebug"));
-        let index_buffer_id = allocator.allocate_buffer::<u32>(device,
-                                                               index_data.len() as u64,
-                                                               BufferTag("SolidIndexDebug"));
+            allocator.allocate_general_buffer::<DebugSolidVertex>(device,
+                                                                  vertex_data.len() as u64,
+                                                                  BufferTag("SolidVertexDebug"));
+        let index_buffer_id = allocator.allocate_index_buffer::<u32>(device,
+                                                                     index_data.len() as u64,
+                                                                     BufferTag("SolidIndexDebug"));
         {
-            let vertex_buffer = allocator.get_buffer(vertex_buffer_id);
-            let index_buffer = allocator.get_buffer(index_buffer_id);
+            let vertex_buffer = allocator.get_general_buffer(vertex_buffer_id);
+            let index_buffer = allocator.get_index_buffer(index_buffer_id);
             device.upload_to_buffer(&vertex_buffer, 0, vertex_data, BufferTarget::Vertex);
             device.upload_to_buffer(&index_buffer, 0, index_data, BufferTarget::Index);
             let solid_vertex_array = DebugSolidVertexArray::new(device,
@@ -215,8 +215,8 @@ impl<D> UIPresenter<D> where D: Device {
             });
         }
 
-        allocator.free_buffer(index_buffer_id);
-        allocator.free_buffer(vertex_buffer_id);
+        allocator.free_index_buffer(index_buffer_id);
+        allocator.free_general_buffer(vertex_buffer_id);
     }
 
     pub fn draw_text(&self,
@@ -465,16 +465,17 @@ impl<D> UIPresenter<D> where D: Device {
                                      index_data: &[u32],
                                      texture: &D::Texture,
                                      color: ColorU) {
-        let vertex_buffer_id =
-            allocator.allocate_buffer::<DebugTextureVertex>(device,
-                                                            vertex_data.len() as u64,
-                                                            BufferTag("TextureVertexDebug"));
-        let index_buffer_id = allocator.allocate_buffer::<u32>(device,
-                                                               index_data.len() as u64,
-                                                               BufferTag("TextureIndexDebug"));
+        let vertex_buffer_id = allocator.allocate_general_buffer::<DebugTextureVertex>(
+            device,
+            vertex_data.len() as u64,
+            BufferTag("TextureVertexDebug"));
+        let index_buffer_id =
+            allocator.allocate_index_buffer::<u32>(device,
+                                                   index_data.len() as u64,
+                                                   BufferTag("TextureIndexDebug"));
         {
-            let vertex_buffer = allocator.get_buffer(vertex_buffer_id);
-            let index_buffer = allocator.get_buffer(index_buffer_id);
+            let vertex_buffer = allocator.get_general_buffer(vertex_buffer_id);
+            let index_buffer = allocator.get_index_buffer(index_buffer_id);
             device.upload_to_buffer(&vertex_buffer, 0, vertex_data, BufferTarget::Vertex);
             device.upload_to_buffer(&index_buffer, 0, index_data, BufferTarget::Index);
 
@@ -506,8 +507,8 @@ impl<D> UIPresenter<D> where D: Device {
             });
         }
 
-        allocator.free_buffer(index_buffer_id);
-        allocator.free_buffer(vertex_buffer_id);
+        allocator.free_index_buffer(index_buffer_id);
+        allocator.free_general_buffer(vertex_buffer_id);
     }
 
     pub fn draw_button(&mut self,
diff --git a/webgl/src/lib.rs b/webgl/src/lib.rs
index dc5c0464..b828bebd 100644
--- a/webgl/src/lib.rs
+++ b/webgl/src/lib.rs
@@ -375,11 +375,6 @@ impl WebGlDevice {
             pos = end_index + 2;
         }
         output.push_str(&source[pos..]);
-        /*
-        for (line_nr, line) in output.lines().enumerate() {
-            debug!("{:3}: {}", line_nr + 1, line);
-        }
-        */
         output
     }
 }
@@ -442,6 +437,17 @@ impl Device for WebGlDevice {
     type VertexArray = WebGlVertexArray;
     type VertexAttr = WebGlVertexAttr;
 
+    #[inline]
+    fn backend_name(&self) -> &'static str {
+        "WebGL"
+    }
+
+    #[inline]
+    fn device_name(&self) -> String {
+        // TODO(pcwalton): Use `WEBGL_debug_renderer_info` if available.
+        "WebGL Device".to_owned()
+    }
+
     #[inline]
     fn feature_level(&self) -> FeatureLevel {
         FeatureLevel::D3D10