diff --git a/Cargo.lock b/Cargo.lock
index 20308b3e..bbad588e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -74,6 +74,11 @@ name = "arrayvec"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "ascii"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "atty"
 version = "0.2.13"
@@ -255,6 +260,11 @@ name = "cc"
 version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "cesu8"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "cfg-if"
 version = "0.1.10"
@@ -269,6 +279,16 @@ dependencies = [
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "chrono"
+version = "0.4.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-integer 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "clap"
 version = "2.33.0"
@@ -313,11 +333,32 @@ dependencies = [
  "objc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "color-backtrace"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.3.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "term 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "color_quant"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "combine"
+version = "3.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ascii 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "constant_time_eq"
 version = "0.1.4"
@@ -384,6 +425,14 @@ dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "crossbeam-channel"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crossbeam-deque"
 version = "0.7.2"
@@ -459,6 +508,27 @@ dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "demo"
+version = "0.1.0"
+dependencies = [
+ "color-backtrace 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gl 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "jemallocator 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "metal 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nfd 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pathfinder_demo 0.1.0",
+ "pathfinder_geometry 0.3.0",
+ "pathfinder_gl 0.1.0",
+ "pathfinder_gpu 0.1.0",
+ "pathfinder_metal 0.1.0",
+ "pathfinder_simd 0.3.0",
+ "pretty_env_logger 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sdl2 0.32.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sdl2-sys 0.32.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "derivative"
 version = "1.0.3"
@@ -502,6 +572,15 @@ dependencies = [
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "egl"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "khronos 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "either"
 version = "1.5.3"
@@ -512,8 +591,20 @@ name = "env_logger"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "atty 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "humantime 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termcolor 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "error-chain"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.3.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -628,6 +719,11 @@ dependencies = [
  "servo-freetype-sys 4.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "fs_extra"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fuchsia-cprng"
 version = "0.1.1"
@@ -684,6 +780,16 @@ dependencies = [
  "xml-rs 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "gl_generator"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "khronos_api 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "xml-rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "gl_generator"
 version = "0.11.0"
@@ -712,6 +818,28 @@ dependencies = [
  "gl_generator 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "glutin"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "android_glue 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cgl 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cocoa 0.18.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gl_generator 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "objc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "osmesa-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shared_library 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wayland-client 0.21.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winit 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "x11-dl 2.18.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "glutin"
 version = "0.21.1"
@@ -836,6 +964,14 @@ name = "hex"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "humantime"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "image"
 version = "0.19.0"
@@ -879,6 +1015,43 @@ name = "itoa"
 version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "jemalloc-sys"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fs_extra 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "jemallocator"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "jemalloc-sys 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "jni"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cesu8 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "combine 3.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "jni-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 2.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "jni-sys"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "jpeg-decoder"
 version = "0.1.16"
@@ -888,6 +1061,14 @@ dependencies = [
  "rayon 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "khronos"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "khronos_api"
 version = "2.2.0"
@@ -911,6 +1092,11 @@ name = "lazy_static"
 version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "libc"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "libc"
 version = "0.2.65"
@@ -944,6 +1130,15 @@ dependencies = [
  "num-traits 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "lock_api"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "owning_ref 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.3.1"
@@ -1065,6 +1260,14 @@ dependencies = [
  "objc_id 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "nfd"
+version = "0.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "nix"
 version = "0.14.1"
@@ -1217,6 +1420,23 @@ dependencies = [
  "shared_library 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "owning_ref"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "parking_lot"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "parking_lot"
 version = "0.9.0"
@@ -1227,6 +1447,18 @@ dependencies = [
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "parking_lot_core"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "parking_lot_core"
 version = "0.6.2"
@@ -1241,6 +1473,20 @@ dependencies = [
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "pathfinder_android_demo"
+version = "0.1.0"
+dependencies = [
+ "egl 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gl 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "jni 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pathfinder_demo 0.1.0",
+ "pathfinder_geometry 0.3.0",
+ "pathfinder_gl 0.1.0",
+ "pathfinder_gpu 0.1.0",
+]
+
 [[package]]
 name = "pathfinder_c"
 version = "0.1.0"
@@ -1285,6 +1531,29 @@ dependencies = [
  "smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "pathfinder_demo"
+version = "0.1.0"
+dependencies = [
+ "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gl 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "image 0.21.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "metal 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pathfinder_content 0.1.0",
+ "pathfinder_export 0.1.0",
+ "pathfinder_geometry 0.3.0",
+ "pathfinder_gl 0.1.0",
+ "pathfinder_gpu 0.1.0",
+ "pathfinder_metal 0.1.0",
+ "pathfinder_renderer 0.1.0",
+ "pathfinder_simd 0.3.0",
+ "pathfinder_svg 0.1.0",
+ "pathfinder_ui 0.1.0",
+ "rayon 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "usvg 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "pathfinder_export"
 version = "0.1.0"
@@ -1332,6 +1601,29 @@ dependencies = [
  "serde_json 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "pathfinder_magicleap_demo"
+version = "0.1.0"
+dependencies = [
+ "crossbeam-channel 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "egl 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gl 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glutin 0.19.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pathfinder_content 0.1.0",
+ "pathfinder_demo 0.1.0",
+ "pathfinder_geometry 0.3.0",
+ "pathfinder_gl 0.1.0",
+ "pathfinder_gpu 0.1.0",
+ "pathfinder_renderer 0.1.0",
+ "pathfinder_simd 0.3.0",
+ "pathfinder_svg 0.1.0",
+ "pathfinder_ui 0.1.0",
+ "rayon 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "usvg 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "pathfinder_metal"
 version = "0.1.0"
@@ -1427,6 +1719,11 @@ dependencies = [
  "serde_json 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "percent-encoding"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "percent-encoding"
 version = "2.1.0"
@@ -1480,6 +1777,16 @@ name = "ppv-lite86"
 version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "pretty_env_logger"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "chrono 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "env_logger 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "0.4.30"
@@ -1496,6 +1803,11 @@ dependencies = [
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "quick-error"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "quickcheck"
 version = "0.8.5"
@@ -1974,6 +2286,11 @@ dependencies = [
  "wayland-protocols 0.21.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "stable_deref_trait"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "stb_truetype"
 version = "0.3.0"
@@ -2116,6 +2433,24 @@ dependencies = [
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "term"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dirs 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "termcolor"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "wincolor 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -2132,6 +2467,16 @@ dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "time"
+version = "0.1.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "toml"
 version = "0.4.10"
@@ -2186,6 +2531,14 @@ name = "unicode-xid"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "unreachable"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "usvg"
 version = "0.7.0"
@@ -2317,6 +2670,37 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "wincolor"
+version = "1.0.2"
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@@ -2514,8 +2922,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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+"checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
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@@ -2572,6 +2982,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
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+"checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8"
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@@ -2584,8 +2995,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)" = "67656ea1dc1b41b1451851562ea232ec2e5a80242139f7e679ceccfb5d61f545"
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@@ -2595,6 +3009,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/geometry/src/transform3d.rs b/geometry/src/transform3d.rs
index e8c41ad5..99b60957 100644
--- a/geometry/src/transform3d.rs
+++ b/geometry/src/transform3d.rs
@@ -10,7 +10,7 @@
 
 //! 3D transforms that can be applied to paths.
 
-use crate::vector::{Vector2F, Vector2I, Vector4F};
+use crate::vector::{Vector2F, Vector2I, Vector3F, Vector4F};
 use crate::rect::RectF;
 use crate::transform2d::Matrix2x2F;
 use pathfinder_simd::default::F32x4;
@@ -201,6 +201,25 @@ impl Transform4F {
         )
     }
 
+    /// Just like `gluLookAt()`.
+    #[inline]
+    pub fn looking_at(eye: Vector3F, center: Vector3F, mut up: Vector3F) -> Transform4F {
+        let f = (center - eye).normalize();
+        up = up.normalize();
+        let s = f.cross(up);
+        let u = s.normalize().cross(f);
+        let minus_f = -f;
+
+        // TODO(pcwalton): Use SIMD. This needs a matrix transpose:
+        // https://fgiesen.wordpress.com/2013/07/09/simd-transposes-1/
+        let transform = Transform4F::row_major(s.x(),       s.y(),       s.z(),       0.0,
+                                               u.x(),       u.y(),       u.z(),       0.0,
+                                               minus_f.x(), minus_f.y(), minus_f.z(), 0.0,
+                                               0.0,         0.0,         0.0,         1.0) *
+                        Transform4F::from_translation((-eye).to_4d());
+        transform
+    }
+
     //     +-     -+
     //     |  A B  |
     //     |  C D  |
diff --git a/geometry/src/vector.rs b/geometry/src/vector.rs
index 03e190fe..80e1f1ef 100644
--- a/geometry/src/vector.rs
+++ b/geometry/src/vector.rs
@@ -318,6 +318,26 @@ impl Vector3F {
     pub fn normalize(self) -> Vector3F {
         Vector3F(self.0 * F32x4::splat(1.0 / self.length()))
     }
+
+    #[inline]
+    pub fn x(self) -> f32 {
+        self.0[0]
+    }
+
+    #[inline]
+    pub fn y(self) -> f32 {
+        self.0[1]
+    }
+
+    #[inline]
+    pub fn z(self) -> f32 {
+        self.0[2]
+    }
+
+    #[inline]
+    pub fn scale(self, factor: f32) -> Vector3F {
+        Vector3F(self.0 * F32x4::splat(factor))
+    }
 }
 
 impl Add<Vector3F> for Vector3F {
@@ -335,6 +355,14 @@ impl AddAssign for Vector3F {
     }
 }
 
+impl Neg for Vector3F {
+    type Output = Vector3F;
+    #[inline]
+    fn neg(self) -> Vector3F {
+        Vector3F(self.0 * F32x4::new(-1.0, -1.0, -1.0, 0.0))
+    }
+}
+
 impl Sub<Vector3F> for Vector3F {
     type Output = Vector3F;
     #[inline]