From 4b930b9e305ff67f26f19cb8bd70430a1d4fff1c Mon Sep 17 00:00:00 2001
From: Manish Goregaokar <manishsmail@gmail.com>
Date: Wed, 29 May 2019 15:59:27 -0700
Subject: [PATCH] Add FakeXRDeviceController.setViews()

---
 .../script/dom/fakexrdevicecontroller.rs      | 58 ++++++++++++++++++-
 .../dom/webidls/FakeXRDeviceController.webidl |  2 +-
 2 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/components/script/dom/fakexrdevicecontroller.rs b/components/script/dom/fakexrdevicecontroller.rs
index 181de822fc7..f690a1bcc43 100644
--- a/components/script/dom/fakexrdevicecontroller.rs
+++ b/components/script/dom/fakexrdevicecontroller.rs
@@ -6,11 +6,16 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use crate::dom::bindings::codegen::Bindings::FakeXRDeviceControllerBinding;
-use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
+use crate::dom::bindings::codegen::Bindings::FakeXRDeviceControllerBinding::{
+    self, FakeXRDeviceControllerMethods, FakeXRViewInit,
+};
+use crate::dom::bindings::codegen::Bindings::XRViewBinding::XREye;
+use crate::dom::bindings::error::{Error, Fallible};
+use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
 use crate::dom::bindings::root::DomRoot;
 use crate::dom::globalscope::GlobalScope;
 use dom_struct::dom_struct;
+use webvr_traits::{MockVRControlMsg, WebVREyeParameters, WebVRMsg};
 
 #[dom_struct]
 pub struct FakeXRDeviceController {
@@ -31,4 +36,53 @@ impl FakeXRDeviceController {
             FakeXRDeviceControllerBinding::Wrap,
         )
     }
+
+    pub fn send_msg(&self, msg: MockVRControlMsg) {
+        self.global()
+            .as_window()
+            .webvr_thread()
+            .unwrap()
+            .send(WebVRMsg::MessageMockDisplay(msg));
+    }
+}
+
+impl FakeXRDeviceControllerMethods for FakeXRDeviceController {
+    // check-tidy: no specs after this line
+    fn SetViews(&self, views: Vec<FakeXRViewInit>) -> Fallible<()> {
+        if views.len() != 2 {
+            return Err(Error::NotSupported);
+        }
+
+        let (left, right) = match (views[0].eye, views[1].eye) {
+            (XREye::Left, XREye::Right) => (&views[0], &views[1]),
+            (XREye::Right, XREye::Left) => (&views[1], &views[0]),
+            _ => return Err(Error::NotSupported),
+        };
+
+        if left.projectionMatrix.len() != 16 ||
+            right.projectionMatrix.len() != 16 ||
+            left.viewOffset.position.len() != 4 ||
+            right.viewOffset.position.len() != 4
+        {
+            return Err(Error::Type("Incorrectly sized matrix".into()));
+        }
+
+        let mut proj_l = [0.; 16];
+        let mut proj_r = [0.; 16];
+        let v: Vec<_> = left.projectionMatrix.iter().map(|x| **x).collect();
+        proj_l.copy_from_slice(&v);
+        let v: Vec<_> = right.projectionMatrix.iter().map(|x| **x).collect();
+        proj_r.copy_from_slice(&v);
+
+        let mut params_l = WebVREyeParameters::default();
+        let mut params_r = WebVREyeParameters::default();
+        let v: Vec<_> = left.viewOffset.position.iter().map(|x| **x).collect();
+        params_l.offset.copy_from_slice(&v);
+        let v: Vec<_> = right.viewOffset.position.iter().map(|x| **x).collect();
+        params_r.offset.copy_from_slice(&v);
+
+        self.send_msg(MockVRControlMsg::SetProjectionMatrices(proj_l, proj_r));
+        self.send_msg(MockVRControlMsg::SetEyeParameters(params_l, params_r));
+        Ok(())
+    }
 }
diff --git a/components/script/dom/webidls/FakeXRDeviceController.webidl b/components/script/dom/webidls/FakeXRDeviceController.webidl
index dbeb93428d7..723088096a0 100644
--- a/components/script/dom/webidls/FakeXRDeviceController.webidl
+++ b/components/script/dom/webidls/FakeXRDeviceController.webidl
@@ -11,7 +11,7 @@ interface FakeXRDeviceController {
 
   // // Sets the values to be used for subsequent
   // // requestAnimationFrame() callbacks.
-  // void setViews(Array<FakeXRViewInit> views);
+  [Throws] void setViews(sequence<FakeXRViewInit> views);
 
   // void setViewerOrigin(FakeXRRigidTransform origin);