Auto merge of #27 - Manishearth:gvr, r=asajeffrey

GoogleVR support

Depends on #25

Not yet finished.

.gitignore

@@ -1,3 +1,10 @@
 *~
 target
 Cargo.lock
+
+.idea
+.vscode
+.gradle/
+build/
+*.iml
+local.properties

.travis.yml

@@ -10,8 +10,10 @@ before_script:
 script:
   - cargo fmt --all -- --check
   - cd webxr
-  - cargo build --features=glwindow,headless
-  - cargo build --features=ipc,glwindow,headless
+  - cargo build --features=glwindow,headless,googlevr
+  - cargo build --features=ipc,glwindow,headless,googlevr
+  - rustup target add arm-linux-androideabi
+  - cargo build --target arm-linux-androideabi --features=ipc,googlevr
 
 notifications:
   webhooks: http://build.servo.org:54856/travis

webxr-api/error.rs

@@ -14,4 +14,5 @@ use serde::{Deserialize, Serialize};
 pub enum Error {
     NoMatchingDevice,
     CommunicationError,
+    BackendSpecific(String),
 }

webxr/Cargo.toml

@@ -22,10 +22,19 @@ path = "lib.rs"
 glwindow = ["glutin"]
 headless = []
 ipc = ["webxr-api/ipc"]
+googlevr = ["gvr-sys", "android_injected_glue"]
+
 
 [dependencies]
 webxr-api = { path = "../webxr-api" }
 euclid = "0.20"
 gleam = "0.6"
 glutin = { version = "0.21", optional = true }
-log = "0.4"
+log = "0.4.6"
+gvr-sys = { version = "0.7", optional = true }
+
+[target.'cfg(target_os = "android")'.dependencies]
+android_injected_glue = { version = "0.2.2", optional = true }
+
+[build-dependencies]
+gl_generator = "0.11"

webxr/build.rs

@@ -0,0 +1,28 @@
+use gl_generator::{Api, Fallbacks, Profile, Registry};
+use std::env;
+use std::fs::{self, File};
+use std::path::Path;
+
+fn main() {
+    // Copy AARs
+    if let Ok(aar_out_dir) = env::var("AAR_OUT_DIR") {
+        fs::copy(
+            &Path::new("googlevr/aar/GVRService.aar"),
+            &Path::new(&aar_out_dir).join("GVRService.aar"),
+        )
+        .unwrap();
+    }
+
+    if !cfg!(feature = "googlevr") {
+        return;
+    }
+
+    let out_dir = env::var("OUT_DIR").unwrap();
+
+    // GLES 2.0 bindings
+    let mut file = File::create(&Path::new(&out_dir).join("gles_bindings.rs")).unwrap();
+    let gles_reg = Registry::new(Api::Gles2, (3, 0), Profile::Core, Fallbacks::All, []);
+    gles_reg
+        .write_bindings(gl_generator::StaticGenerator, &mut file)
+        .unwrap();
+}