21 files changed, 176 insertions, 50 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 825267a..3cce0ee 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "glutin"
-version = "0.4.6"
-authors = ["tomaka <pierre.krieger1708@gmail.com>"]
+version = "0.4.8"
+authors = ["The glutin contributors, Pierre Krieger <pierre.krieger1708@gmail.com>"]
 description = "Cross-platform OpenGL context provider."
 keywords = ["windowing", "opengl"]
 license = "Apache-2.0"
@@ -19,9 +19,6 @@ shared_library = "0.1.0"
 gl_generator = "0.4"
 khronos_api = "1.0"
 
-[dev-dependencies]
-clock_ticks = "0.1.0"
-
 [target.arm-linux-androideabi.dependencies.android_glue]
 version = "0.1"
 
@@ -107,6 +104,13 @@ wayland-kbd = "0.3.3"
 wayland-window = "0.2.2"
 x11-dl = "~2.3"
 
+[target.armv7-unknown-linux-gnueabihf.dependencies]
+osmesa-sys = "0.0.5"
+wayland-client = { version = "0.5.4", features = ["egl", "dlopen"] }
+wayland-kbd = "0.3.3"
+wayland-window = "0.2.2"
+x11-dl = "~2.3"
+
 [target.aarch64-unknown-linux-gnu.dependencies]
 osmesa-sys = "0.0.5"
 wayland-client = { version = "0.5.4", features = ["egl", "dlopen"] }
diff --git a/examples/support/mod.rs b/examples/support/mod.rs
index ebbe379..a51ca24 100644
--- a/examples/support/mod.rs
+++ b/examples/support/mod.rs
@@ -24,11 +24,11 @@ pub fn load(window: &glutin::Window) -> Context {
 
     unsafe {
         let vs = gl.CreateShader(gl::VERTEX_SHADER);
-        gl.ShaderSource(vs, 1, [VS_SRC.as_ptr() as *const i8].as_ptr(), ptr::null());
+        gl.ShaderSource(vs, 1, [VS_SRC.as_ptr() as *const _].as_ptr(), ptr::null());
         gl.CompileShader(vs);
 
         let fs = gl.CreateShader(gl::FRAGMENT_SHADER);
-        gl.ShaderSource(fs, 1, [FS_SRC.as_ptr() as *const i8].as_ptr(), ptr::null());
+        gl.ShaderSource(fs, 1, [FS_SRC.as_ptr() as *const _].as_ptr(), ptr::null());
         gl.CompileShader(fs);
 
         let program = gl.CreateProgram();
diff --git a/src/api/android/mod.rs b/src/api/android/mod.rs
index f42caeb..433472c 100644
--- a/src/api/android/mod.rs
+++ b/src/api/android/mod.rs
@@ -65,6 +65,11 @@ impl MonitorId {
     }
 }
 
+#[derive(Default)]
+pub struct PlatformSpecificWindowBuilderAttributes;
+#[derive(Default)]
+pub struct PlatformSpecificHeadlessBuilderAttributes;
+
 pub struct PollEventsIterator<'a> {
     window: &'a Window,
 }
@@ -116,7 +121,8 @@ impl<'a> Iterator for WaitEventsIterator<'a> {
 
 impl Window {
     pub fn new(win_attribs: &WindowAttributes, pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&Window>) -> Result<Window, CreationError>
+               opengl: &GlAttributes<&Window>, _: &PlatformSpecificWindowBuilderAttributes)
+               -> Result<Window, CreationError>
     {
         use std::{mem, ptr};
 
@@ -302,7 +308,9 @@ pub struct HeadlessContext(EglContext);
 impl HeadlessContext {
     /// See the docs in the crate root file.
     pub fn new(dimensions: (u32, u32), pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&HeadlessContext>) -> Result<HeadlessContext, CreationError>
+               opengl: &GlAttributes<&HeadlessContext>,
+               _: &PlatformSpecificHeadlessBuilderAttributes)
+               -> Result<HeadlessContext, CreationError>
     {
         let opengl = opengl.clone().map_sharing(|c| &c.0);
         let context = try!(EglContext::new(egl::ffi::egl::Egl, pf_reqs, &opengl,
diff --git a/src/api/caca/mod.rs b/src/api/caca/mod.rs
index 687c66f..e73fa6c 100644
--- a/src/api/caca/mod.rs
+++ b/src/api/caca/mod.rs
@@ -1,4 +1,4 @@
-#![cfg(any(target_os = "linux", target_os = "freebsd"))]
+#![cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd"))]
 #![allow(unused_variables, dead_code)]
 
 use libc;
diff --git a/src/api/cocoa/headless.rs b/src/api/cocoa/headless.rs
index 7fe2046..ac6c4e0 100644
--- a/src/api/cocoa/headless.rs
+++ b/src/api/cocoa/headless.rs
@@ -13,6 +13,9 @@ use cocoa::appkit::*;
 use PixelFormat;
 use api::cocoa::helpers;
 
+#[derive(Default)]
+pub struct PlatformSpecificHeadlessBuilderAttributes;
+
 pub struct HeadlessContext {
     width: u32,
     height: u32,
@@ -21,7 +24,9 @@ pub struct HeadlessContext {
 
 impl HeadlessContext {
     pub fn new((width, height): (u32, u32), pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&HeadlessContext>) -> Result<HeadlessContext, CreationError>
+               opengl: &GlAttributes<&HeadlessContext>,
+               _: &PlatformSpecificHeadlessBuilderAttributes)
+               -> Result<HeadlessContext, CreationError>
     {
         let context = unsafe {
 
diff --git a/src/api/cocoa/mod.rs b/src/api/cocoa/mod.rs
index 138a448..4502405 100644
--- a/src/api/cocoa/mod.rs
+++ b/src/api/cocoa/mod.rs
@@ -1,7 +1,5 @@
 #![cfg(target_os = "macos")]
 
-pub use self::headless::HeadlessContext;
-
 use {CreationError, Event, MouseCursor, CursorState};
 use CreationError::OsError;
 use libc;
@@ -50,6 +48,8 @@ use events::MouseButton;
 use events;
 
 pub use self::monitor::{MonitorId, get_available_monitors, get_primary_monitor};
+pub use self::headless::HeadlessContext;
+pub use self::headless::PlatformSpecificHeadlessBuilderAttributes;
 
 mod monitor;
 mod event;
@@ -179,6 +179,9 @@ impl Drop for WindowDelegate {
     }
 }
 
+#[derive(Default)]
+pub struct PlatformSpecificWindowBuilderAttributes;
+
 pub struct Window {
     view: IdRef,
     window: IdRef,
@@ -264,7 +267,8 @@ impl<'a> Iterator for WaitEventsIterator<'a> {
 
 impl Window {
     pub fn new(win_attribs: &WindowAttributes, pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&Window>) -> Result<Window, CreationError>
+               opengl: &GlAttributes<&Window>, _: &PlatformSpecificWindowBuilderAttributes)
+               -> Result<Window, CreationError>
     {
         if opengl.sharing.is_some() {
             unimplemented!()
@@ -837,9 +841,7 @@ unsafe fn NSEventToEvent(window: &Window, nsevent: id) -> Option<Event> {
             let received_c_str = nsevent.characters().UTF8String();
             let received_str = CStr::from_ptr(received_c_str);
             for received_char in from_utf8(received_str.to_bytes()).unwrap().chars() {
-                if received_char.is_ascii() {
-                    events.push_back(ReceivedCharacter(received_char));
-                }
+                events.push_back(ReceivedCharacter(received_char));
             }
 
             let vkey =  event::vkeycode_to_element(NSEvent::keyCode(nsevent));
@@ -881,10 +883,13 @@ unsafe fn NSEventToEvent(window: &Window, nsevent: id) -> Option<Event> {
         },
         NSScrollWheel => {
             use events::MouseScrollDelta::{LineDelta, PixelDelta};
+            let scale_factor = window.hidpi_factor();
             let delta = if nsevent.hasPreciseScrollingDeltas() == YES {
-                PixelDelta(nsevent.scrollingDeltaX() as f32, nsevent.scrollingDeltaY() as f32)
+                PixelDelta(scale_factor * nsevent.scrollingDeltaX() as f32,
+                           scale_factor * nsevent.scrollingDeltaY() as f32)
             } else {
-                LineDelta(nsevent.scrollingDeltaX() as f32, nsevent.scrollingDeltaY() as f32)
+                LineDelta(scale_factor * nsevent.scrollingDeltaX() as f32,
+                          scale_factor * nsevent.scrollingDeltaY() as f32)
             };
             Some(MouseWheel(delta))
         },
diff --git a/src/api/emscripten/mod.rs b/src/api/emscripten/mod.rs
index 61d8c8c..67f57d1 100644
--- a/src/api/emscripten/mod.rs
+++ b/src/api/emscripten/mod.rs
@@ -2,11 +2,17 @@
 
 use std::ffi::CString;
 use libc;
-use {Event, BuilderAttribs, CreationError, MouseCursor};
 use Api;
-use PixelFormat;
+use Event;
+use CreationError;
 use ContextError;
+use CursorState;
+use GlAttributes;
 use GlContext;
+use MouseCursor;
+use PixelFormat;
+use PixelFormatRequirements;
+use WindowAttributes;
 
 use std::collections::VecDeque;
 
@@ -52,6 +58,7 @@ impl WindowProxy {
     }
 }
 
+#[derive(Clone)]
 pub struct MonitorId;
 
 #[inline]
@@ -73,13 +80,20 @@ impl MonitorId {
     }
 
     #[inline]
+    pub fn get_native_identifier(&self) -> ::native_monitor::NativeMonitorId {
+        ::native_monitor::NativeMonitorId::Unavailable
+    }
+
+    #[inline]
     pub fn get_dimensions(&self) -> (u32, u32) {
         unimplemented!()
     }
 }
 
 impl Window {
-    pub fn new(builder: BuilderAttribs) -> Result<Window, CreationError> {
+    pub fn new(window: &WindowAttributes, pf_reqs: &PixelFormatRequirements,
+               opengl: &GlAttributes<&Window>) -> Result<Window, CreationError>
+    {
         // getting the default values of attributes
         let mut attributes = unsafe {
             use std::mem;
@@ -198,14 +212,23 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_cursor(&self, _cursor: MouseCursor) {
-        unimplemented!()
+    pub fn set_cursor(&self, cursor: MouseCursor) {
+    }
+
+    #[inline]
+    pub fn set_cursor_state(&self, state: CursorState) -> Result<(), String> {
+        Ok(())
     }
 
     #[inline]
     pub fn hidpi_factor(&self) -> f32 {
         1.0
     }
+
+    #[inline]
+    pub fn set_cursor_position(&self, x: i32, y: i32) -> Result<(), ()> {
+        Ok(())
+    }
 }
 
 impl GlContext for Window {
@@ -222,11 +245,11 @@ impl GlContext for Window {
     }
 
     fn get_proc_address(&self, addr: &str) -> *const () {
-        let addr = CString::new(addr.as_bytes()).unwrap();
-        let addr = addr.as_ptr();
+        let addr = CString::new(addr).unwrap();
 
         unsafe {
-            ffi::emscripten_GetProcAddress(addr) as *const _
+            // FIXME: if `as_ptr()` is used, then wrong data is passed to emscripten
+            ffi::emscripten_GetProcAddress(addr.into_raw() as *const _) as *const _
         }
     }
 
diff --git a/src/api/ios/mod.rs b/src/api/ios/mod.rs
index 852d97c..afcc6f4 100644
--- a/src/api/ios/mod.rs
+++ b/src/api/ios/mod.rs
@@ -177,10 +177,14 @@ impl MonitorId {
     }
 }
 
+#[derive(Default)]
+pub struct PlatformSpecificWindowBuilderAttributes;
 
 impl Window {
 
-    pub fn new(builder: &WindowAttributes, _: &PixelFormatRequirements, _: &GlAttributes<&Window>) -> Result<Window, CreationError> {
+    pub fn new(builder: &WindowAttributes, _: &PixelFormatRequirements, _: &GlAttributes<&Window>,
+               _: &PlatformSpecificWindowBuilderAttributes) -> Result<Window, CreationError>
+    {
         unsafe {
             if setjmp(mem::transmute(&mut jmpbuf)) != 0 {
                 let app: id = msg_send![Class::get("UIApplication").unwrap(), sharedApplication];
diff --git a/src/api/osmesa/mod.rs b/src/api/osmesa/mod.rs
index 02c43a1..7ef243a 100644
--- a/src/api/osmesa/mod.rs
+++ b/src/api/osmesa/mod.rs
@@ -1,4 +1,4 @@
-#![cfg(any(target_os = "linux", target_os = "freebsd", target_os = "dragonfly"))]
+#![cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd"))]
 
 extern crate osmesa_sys;
 
diff --git a/src/api/x11/window.rs b/src/api/x11/window.rs
index 4b78c4a..8cae2be 100644
--- a/src/api/x11/window.rs
+++ b/src/api/x11/window.rs
@@ -469,10 +469,6 @@ impl Window {
             display.check_errors().expect("Failed to call XInternAtom");
             (display.xlib.XSetWMProtocols)(display.display, window, &mut wm_delete_window, 1);
             display.check_errors().expect("Failed to call XSetWMProtocols");
-            with_c_str(&*window_attrs.title, |title| {;
-                (display.xlib.XStoreName)(display.display, window, title);
-            });
-            display.check_errors().expect("Failed to call XStoreName");
             (display.xlib.XFlush)(display.display);
             display.check_errors().expect("Failed to call XFlush");
 
@@ -636,6 +632,8 @@ impl Window {
             input_handler: Mutex::new(XInputEventHandler::new(display, window, ic, window_attrs))
         };
 
+        window.set_title(&window_attrs.title);
+
         if window_attrs.visible {
             unsafe {
                 let ref x_window: &XWindow = window.x.borrow();
@@ -669,12 +667,27 @@ impl Window {
     }
 
     pub fn set_title(&self, title: &str) {
-        with_c_str(title, |title| unsafe {
-            (self.x.display.xlib.XStoreName)(self.x.display.display, self.x.window, title);
+        let wm_name = unsafe {
+            (self.x.display.xlib.XInternAtom)(self.x.display.display, b"_NET_WM_NAME\0".as_ptr() as *const _, 0)
+        };
+        self.x.display.check_errors().expect("Failed to call XInternAtom");
+
+        let wm_utf8_string = unsafe {
+            (self.x.display.xlib.XInternAtom)(self.x.display.display, b"UTF8_STRING\0".as_ptr() as *const _, 0)
+        };
+        self.x.display.check_errors().expect("Failed to call XInternAtom");
+
+        with_c_str(title, |c_title| unsafe {
+            (self.x.display.xlib.XStoreName)(self.x.display.display, self.x.window, c_title);
+
+            let len = title.as_bytes().len();
+            (self.x.display.xlib.XChangeProperty)(self.x.display.display, self.x.window,
+                                            wm_name, wm_utf8_string, 8, ffi::PropModeReplace,
+                                            c_title as *const u8, len as libc::c_int);
             (self.x.display.xlib.XFlush)(self.x.display.display);
         });
+        self.x.display.check_errors().expect("Failed to set window title");
 
-        self.x.display.check_errors().expect("Failed to call XStoreName");
     }
 
     pub fn show(&self) {
diff --git a/src/headless.rs b/src/headless.rs
index 67ea8da..8ea4141 100644
--- a/src/headless.rs
+++ b/src/headless.rs
@@ -20,6 +20,9 @@ pub struct HeadlessRendererBuilder<'a> {
 
     // Should be made public once it's stabilized.
     pf_reqs: PixelFormatRequirements,
+
+    /// Platform-specific configuration.
+    platform_specific: platform::PlatformSpecificHeadlessBuilderAttributes,
 }
 
 impl<'a> HeadlessRendererBuilder<'a> {
@@ -30,6 +33,7 @@ impl<'a> HeadlessRendererBuilder<'a> {
             dimensions: (width, height),
             pf_reqs: Default::default(),
             opengl: Default::default(),
+            platform_specific: Default::default(),
         }
     }
 
@@ -63,7 +67,8 @@ impl<'a> HeadlessRendererBuilder<'a> {
     ///  out of memory, etc.
     #[inline]
     pub fn build(self) -> Result<HeadlessContext, CreationError> {
-        platform::HeadlessContext::new(self.dimensions, &self.pf_reqs, &self.opengl)
+        platform::HeadlessContext::new(self.dimensions, &self.pf_reqs, &self.opengl,
+                                       &self.platform_specific)
                 .map(|w| HeadlessContext { context: w })
     }
 
diff --git a/src/lib.rs b/src/lib.rs
index 2bd7fe3..a27aa72 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -54,7 +54,7 @@ extern crate cocoa;
 extern crate core_foundation;
 #[cfg(target_os = "macos")]
 extern crate core_graphics;
-#[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "dragonfly"))]
+#[cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd"))]
 extern crate x11_dl;
 #[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "dragonfly"))]
 #[macro_use(wayland_env)]
diff --git a/src/os/unix.rs b/src/os/unix.rs
index d206351..f42b3c6 100644
--- a/src/os/unix.rs
+++ b/src/os/unix.rs
@@ -3,8 +3,9 @@
 use libc;
 use Window;
 use platform::Window as LinuxWindow;
+use WindowBuilder;
 
-/// Additional methods on `Window` that are specific to unix.
+/// Additional methods on `Window` that are specific to Unix.
 pub trait WindowExt {
     /// Returns a pointer to the `Window` object of xlib that is used by this window.
     ///
@@ -38,3 +39,11 @@ impl WindowExt for Window {
         }
     }
 }
+
+/// Additional methods on `WindowBuilder` that are specific to Unix.
+pub trait WindowBuilderExt {
+
+}
+
+impl<'a> WindowBuilderExt for WindowBuilder<'a> {
+}
diff --git a/src/os/windows.rs b/src/os/windows.rs
index e9ab056..02a76e2 100644
--- a/src/os/windows.rs
+++ b/src/os/windows.rs
@@ -2,8 +2,9 @@
 
 use libc;
 use Window;
+use WindowBuilder;
 
-/// Additional methods on `Window` that are specific to unix.
+/// Additional methods on `Window` that are specific to Windows.
 pub trait WindowExt {
     /// Returns a pointer to the `Window` object of xlib that is used by this window.
     ///
@@ -19,3 +20,11 @@ impl WindowExt for Window {
         self.window.platform_window()
     }
 }
+
+/// Additional methods on `WindowBuilder` that are specific to Windows.
+pub trait WindowBuilderExt {
+
+}
+
+impl<'a> WindowBuilderExt for WindowBuilder<'a> {
+}
diff --git a/src/platform/emscripten/mod.rs b/src/platform/emscripten/mod.rs
index 270cdaf..ce8d201 100644
--- a/src/platform/emscripten/mod.rs
+++ b/src/platform/emscripten/mod.rs
@@ -1,7 +1,12 @@
 #![cfg(target_os = "emscripten")]
 
+use Api;
 use ContextError;
+use CreationError;
+use GlAttributes;
 use GlContext;
+use PixelFormat;
+use PixelFormatRequirements;
 
 pub use api::emscripten::{Window, WindowProxy, MonitorId, get_available_monitors};
 pub use api::emscripten::{get_primary_monitor, WaitEventsIterator, PollEventsIterator};
@@ -11,8 +16,10 @@ pub struct HeadlessContext(Window);
 impl HeadlessContext {
     /// See the docs in the crate root file.
     #[inline]
-    pub fn new(builder: BuilderAttribs) -> Result<HeadlessContext, CreationError> {
-        Window::new(builder).map(|w| HeadlessContext(w))
+    pub fn new(_: (u32, u32), _: &PixelFormatRequirements, _: &GlAttributes<&HeadlessContext>)
+               -> Result<HeadlessContext, CreationError>
+    {
+        unimplemented!()
     }
 }
 
@@ -50,3 +57,8 @@ impl GlContext for HeadlessContext {
 
 unsafe impl Send for HeadlessContext {}
 unsafe impl Sync for HeadlessContext {}
+
+#[derive(Default)]
+pub struct PlatformSpecificWindowBuilderAttributes;
+#[derive(Default)]
+pub struct PlatformSpecificHeadlessBuilderAttributes;
diff --git a/src/platform/ios/mod.rs b/src/platform/ios/mod.rs
index aeaebc3..2e6fbec 100644
--- a/src/platform/ios/mod.rs
+++ b/src/platform/ios/mod.rs
@@ -8,12 +8,17 @@ use ContextError;
 
 pub use api::ios::*;
 
+#[derive(Default)]
+pub struct PlatformSpecificHeadlessBuilderAttributes;
+
 pub struct HeadlessContext(i32);
 
 impl HeadlessContext {
     /// See the docs in the crate root file.
-    pub fn new(_: (u32, u32), _: &PixelFormatRequirements, _: &GlAttributes<&HeadlessContext>)
-            -> Result<HeadlessContext, CreationError> {
+    pub fn new(_: (u32, u32), _: &PixelFormatRequirements, _: &GlAttributes<&HeadlessContext>,
+               _: &PlatformSpecificHeadlessBuilderAttributes)
+               -> Result<HeadlessContext, CreationError>
+    {
         unimplemented!()
     }
 
diff --git a/src/platform/linux/api_dispatch.rs b/src/platform/linux/api_dispatch.rs
index 2373770..2e135e2 100644
--- a/src/platform/linux/api_dispatch.rs
+++ b/src/platform/linux/api_dispatch.rs
@@ -22,6 +22,9 @@ use api::x11::XConnection;
 use api::x11::XError;
 use api::x11::XNotSupported;
 
+#[derive(Default)]
+pub struct PlatformSpecificWindowBuilderAttributes;
+
 enum Backend {
     X(Arc<XConnection>),
     Wayland,
@@ -172,7 +175,8 @@ impl<'a> Iterator for WaitEventsIterator<'a> {
 impl Window {
     #[inline]
     pub fn new(window: &WindowAttributes, pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&Window>) -> Result<Window, CreationError>
+               opengl: &GlAttributes<&Window>, _: &PlatformSpecificWindowBuilderAttributes)
+               -> Result<Window, CreationError>
     {
         match *BACKEND {
             Backend::Wayland => {
diff --git a/src/platform/linux/mod.rs b/src/platform/linux/mod.rs
index d010a89..9a9eb3f 100644
--- a/src/platform/linux/mod.rs
+++ b/src/platform/linux/mod.rs
@@ -12,13 +12,19 @@ use api::osmesa::{self, OsMesaContext};
 
 pub use self::api_dispatch::{Window, WindowProxy, MonitorId, get_available_monitors, get_primary_monitor};
 pub use self::api_dispatch::{WaitEventsIterator, PollEventsIterator};
+pub use self::api_dispatch::PlatformSpecificWindowBuilderAttributes;
 mod api_dispatch;
 
+#[derive(Default)]
+pub struct PlatformSpecificHeadlessBuilderAttributes;
+
 pub struct HeadlessContext(OsMesaContext);
 
 impl HeadlessContext {
     pub fn new(dimensions: (u32, u32), pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&HeadlessContext>) -> Result<HeadlessContext, CreationError>
+               opengl: &GlAttributes<&HeadlessContext>,
+               _: &PlatformSpecificHeadlessBuilderAttributes)
+               -> Result<HeadlessContext, CreationError>
     {
         let opengl = opengl.clone().map_sharing(|c| &c.0);
 
diff --git a/src/platform/mod.rs b/src/platform/mod.rs
index 4855765..8527da2 100644
--- a/src/platform/mod.rs
+++ b/src/platform/mod.rs
@@ -15,8 +15,11 @@ mod platform;
 #[cfg(target_os = "ios")]
 #[path="ios/mod.rs"]
 mod platform;
+#[cfg(target_os = "emscripten")]
+#[path="emscripten/mod.rs"]
+mod platform;
 
 #[cfg(all(not(target_os = "ios"), not(target_os = "windows"), not(target_os = "linux"),
   not(target_os = "macos"), not(target_os = "android"), not(target_os = "dragonfly"),
-  not(target_os = "freebsd")))]
+  not(target_os = "freebsd"), not(target_os = "emscripten")))]
 use this_platform_is_not_supported;
diff --git a/src/platform/windows/mod.rs b/src/platform/windows/mod.rs
index 246ca51..0c78322 100644
--- a/src/platform/windows/mod.rs
+++ b/src/platform/windows/mod.rs
@@ -51,6 +51,10 @@ lazy_static! {
     };
 }
 
+#[derive(Default)]
+pub struct PlatformSpecificWindowBuilderAttributes;
+#[derive(Default)]
+pub struct PlatformSpecificHeadlessBuilderAttributes;
 
 /// The Win32 implementation of the main `Window` object.
 pub struct Window(win32::Window);
@@ -59,7 +63,8 @@ impl Window {
     /// See the docs in the crate root file.
     #[inline]
     pub fn new(window: &WindowAttributes, pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&Window>) -> Result<Window, CreationError>
+               opengl: &GlAttributes<&Window>, _: &PlatformSpecificWindowBuilderAttributes)
+               -> Result<Window, CreationError>
     {
         win32::Window::new(window, pf_reqs, &opengl.clone().map_sharing(|w| &w.0),
                            EGL.as_ref().map(|w| &w.0)).map(|w| Window(w))
@@ -92,7 +97,9 @@ pub enum HeadlessContext {
 
 impl HeadlessContext {
     pub fn new(dimensions: (u32, u32), pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&HeadlessContext>) -> Result<HeadlessContext, CreationError>
+               opengl: &GlAttributes<&HeadlessContext>,
+               _: &PlatformSpecificHeadlessBuilderAttributes)
+               -> Result<HeadlessContext, CreationError>
     {
         // if EGL is available, we try using EGL first
         // if EGL returns an error, we try the hidden window method
diff --git a/src/window.rs b/src/window.rs
index f672ed5..6d2f0d3 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -31,6 +31,9 @@ pub struct WindowBuilder<'a> {
 
     // Should be made public once it's stabilized.
     pf_reqs: PixelFormatRequirements,
+
+    /// Platform-specific configuration.
+    platform_specific: platform::PlatformSpecificWindowBuilderAttributes,
 }
 
 impl<'a> WindowBuilder<'a> {
@@ -41,6 +44,7 @@ impl<'a> WindowBuilder<'a> {
             pf_reqs: Default::default(),
             window: Default::default(),
             opengl: Default::default(),
+            platform_specific: Default::default(),
         }
     }
 
@@ -227,7 +231,7 @@ impl<'a> WindowBuilder<'a> {
         }
 
         // building
-        platform::Window::new(&self.window, &self.pf_reqs, &self.opengl)
+        platform::Window::new(&self.window, &self.pf_reqs, &self.opengl, &self.platform_specific)
                             .map(|w| Window { window: w })
     }