Add live-reload for shaders

Recompiling the entire program whenever a shader changes is slow, and it
can interrupt flow. Shader reloads are essentially instantaneous now. If
the new shader fails to compile, no state is changed; the previous
program continues to be used.

1 files changed, 150 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 16457c20..565684bc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,6 +8,7 @@ dependencies = [
  "gl_generator 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "glutin 0.4.9 (git+https://github.com/jwilm/glutin?rev=c95e6973ace3cbf321123a64588b27f032675be9)",
  "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "notify 2.5.5 (git+https://github.com/jwilm/rsnotify?branch=add-ignore-op)",
  "servo-fontconfig 0.2.0 (git+https://github.com/jwilm/rust-fontconfig)",
 ]
 
@@ -23,6 +24,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bitflags"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "bitflags"
 version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
@@ -37,6 +43,16 @@ version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "bytes"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "cfg-if"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "cgl"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -143,6 +159,14 @@ dependencies = [
 ]
 
 [[package]]
+name = "filetime"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "freetype-rs"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -173,6 +197,24 @@ dependencies = [
 ]
 
 [[package]]
+name = "fsevent"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fsevent-sys 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "fsevent-sys"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "gcc"
 version = "0.3.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -243,6 +285,14 @@ dependencies = [
 ]
 
 [[package]]
+name = "inotify"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "kernel32-sys"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -321,6 +371,73 @@ dependencies = [
 ]
 
 [[package]]
+name = "mio"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "miow 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nix 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "miow"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "net2"
+version = "0.2.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "nix"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "notify"
+version = "2.5.5"
+source = "git+https://github.com/jwilm/rsnotify?branch=add-ignore-op#0ca41a4807c427e6cf47d7e75735df62d2e86708"
+dependencies = [
+ "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fsevent 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fsevent-sys 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "inotify 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "num"
 version = "0.1.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -478,6 +595,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "slab"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "tempfile"
 version = "2.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -490,6 +612,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "time"
+version = "0.1.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "user32-sys"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -499,6 +631,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "walkdir"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "wayland-client"
 version = "0.5.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -561,6 +702,15 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "ws2_32-sys"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "x11-dl"
 version = "2.4.0"
 source = "git+https://github.com/jwilm/x11-rs?rev=40f08df7b4408980b922b3c6e258c9c6765c2c24#40f08df7b4408980b922b3c6e258c9c6765c2c24"