1 files changed, 131 insertions, 0 deletions
diff --git a/components/script/dom/gamepadpose.rs b/components/script/dom/gamepadpose.rs
new file mode 100644
index 00000000000..10d770ea68a
--- /dev/null
+++ b/components/script/dom/gamepadpose.rs
@@ -0,0 +1,131 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * 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::GamepadPoseBinding::GamepadPoseMethods;
+use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::globalscope::GlobalScope;
+use crate::script_runtime::JSContext;
+use dom_struct::dom_struct;
+use js::jsapi::{Heap, JSObject};
+use js::typedarray::{CreateWith, Float32Array};
+use std::ptr;
+use std::ptr::NonNull;
+
+#[dom_struct]
+pub struct GamepadPose {
+    reflector_: Reflector,
+    #[ignore_malloc_size_of = "mozjs"]
+    position: Heap<*mut JSObject>,
+    #[ignore_malloc_size_of = "mozjs"]
+    orientation: Heap<*mut JSObject>,
+    #[ignore_malloc_size_of = "mozjs"]
+    linear_vel: Heap<*mut JSObject>,
+    #[ignore_malloc_size_of = "mozjs"]
+    angular_vel: Heap<*mut JSObject>,
+    #[ignore_malloc_size_of = "mozjs"]
+    linear_acc: Heap<*mut JSObject>,
+    #[ignore_malloc_size_of = "mozjs"]
+    angular_acc: Heap<*mut JSObject>,
+}
+
+// TODO: support gamepad discovery
+#[allow(dead_code)]
+#[allow(unsafe_code)]
+fn update_or_create_typed_array(cx: JSContext, src: Option<&[f32]>, dst: &Heap<*mut JSObject>) {
+    match src {
+        Some(data) => {
+            if dst.get().is_null() {
+                rooted!(in (*cx) let mut array = ptr::null_mut::<JSObject>());
+                let _ = unsafe {
+                    Float32Array::create(*cx, CreateWith::Slice(data), array.handle_mut())
+                };
+                (*dst).set(array.get());
+            } else {
+                typedarray!(in(*cx) let array: Float32Array = dst.get());
+                if let Ok(mut array) = array {
+                    unsafe { array.update(data) };
+                }
+            }
+        },
+        None => {
+            if !dst.get().is_null() {
+                dst.set(ptr::null_mut());
+            }
+        },
+    }
+}
+
+#[inline]
+#[allow(unsafe_code)]
+fn heap_to_option(heap: &Heap<*mut JSObject>) -> Option<NonNull<JSObject>> {
+    let js_object = heap.get();
+    if js_object.is_null() {
+        None
+    } else {
+        unsafe { Some(NonNull::new_unchecked(js_object)) }
+    }
+}
+
+// TODO: support gamepad discovery
+#[allow(dead_code)]
+impl GamepadPose {
+    fn new_inherited() -> GamepadPose {
+        GamepadPose {
+            reflector_: Reflector::new(),
+            position: Heap::default(),
+            orientation: Heap::default(),
+            linear_vel: Heap::default(),
+            angular_vel: Heap::default(),
+            linear_acc: Heap::default(),
+            angular_acc: Heap::default(),
+        }
+    }
+
+    pub fn new(global: &GlobalScope) -> DomRoot<GamepadPose> {
+        reflect_dom_object(Box::new(GamepadPose::new_inherited()), global)
+    }
+}
+
+impl GamepadPoseMethods for GamepadPose {
+    // https://w3c.github.io/gamepad/extensions.html#dom-gamepadpose-position
+    fn GetPosition(&self, _cx: JSContext) -> Option<NonNull<JSObject>> {
+        heap_to_option(&self.position)
+    }
+
+    // https://w3c.github.io/gamepad/extensions.html#dom-gamepadpose-hasposition
+    fn HasPosition(&self) -> bool {
+        !self.position.get().is_null()
+    }
+
+    // https://w3c.github.io/gamepad/extensions.html#dom-gamepadpose-linearvelocity
+    fn GetLinearVelocity(&self, _cx: JSContext) -> Option<NonNull<JSObject>> {
+        heap_to_option(&self.linear_vel)
+    }
+
+    // https://w3c.github.io/gamepad/extensions.html#dom-gamepadpose-linearacceleration
+    fn GetLinearAcceleration(&self, _cx: JSContext) -> Option<NonNull<JSObject>> {
+        heap_to_option(&self.linear_acc)
+    }
+
+    // https://w3c.github.io/gamepad/extensions.html#dom-gamepadpose-orientation
+    fn GetOrientation(&self, _cx: JSContext) -> Option<NonNull<JSObject>> {
+        heap_to_option(&self.orientation)
+    }
+
+    // https://w3c.github.io/gamepad/extensions.html#dom-gamepadpose-orientation
+    fn HasOrientation(&self) -> bool {
+        !self.orientation.get().is_null()
+    }
+
+    // https://w3c.github.io/gamepad/extensions.html#dom-gamepadpose-angularvelocity
+    fn GetAngularVelocity(&self, _cx: JSContext) -> Option<NonNull<JSObject>> {
+        heap_to_option(&self.angular_vel)
+    }
+
+    // https://w3c.github.io/gamepad/extensions.html#dom-gamepadpose-angularacceleration
+    fn GetAngularAcceleration(&self, _cx: JSContext) -> Option<NonNull<JSObject>> {
+        heap_to_option(&self.angular_acc)
+    }
+}