Reorganize the Linux implementation and split OSMesa and X11

1 files changed, 880 insertions, 15 deletions

diff --git a/src/api/x11/mod.rs b/src/api/x11/mod.rs
index 5aadc94..c4c5a76 100644
--- a/src/api/x11/mod.rs
+++ b/src/api/x11/mod.rs
@@ -1,22 +1,887 @@
-#![cfg(target_os = "linux")]
+#![cfg(all(target_os = "linux", feature = "window"))]
 
-#[cfg(feature = "headless")]
-pub use self::headless::HeadlessContext;
+use {Event, BuilderAttribs, MouseCursor};
+use CreationError;
+use CreationError::OsError;
+use libc;
+use std::{mem, ptr};
+use std::cell::Cell;
+use std::sync::atomic::AtomicBool;
+use std::collections::VecDeque;
+use std::sync::{Arc, Mutex, Once, ONCE_INIT};
 
-#[cfg(feature = "window")]
-pub use self::window::{Window, WindowProxy, MonitorID, get_available_monitors, get_primary_monitor};
-#[cfg(feature = "window")]
-pub use self::window::{WaitEventsIterator, PollEventsIterator};
+use Api;
+use CursorState;
+use GlRequest;
+use PixelFormat;
 
+pub use self::monitor::{MonitorID, get_available_monitors, get_primary_monitor};
+
+mod events;
 mod ffi;
+mod monitor;
+
+static THREAD_INIT: Once = ONCE_INIT;
+
+// XOpenIM doesn't seem to be thread-safe
+lazy_static! {      // TODO: use a static mutex when that's possible, and put me back in my function
+    static ref GLOBAL_XOPENIM_LOCK: Mutex<()> = Mutex::new(());
+}
+
+unsafe extern "C" fn x_error_callback(_: *mut ffi::Display, event: *mut ffi::XErrorEvent) -> libc::c_int {
+    println!("[glutin] x error code={} major={} minor={}!", (*event).error_code, (*event).request_code, (*event).minor_code);
+    0
+}
+
+fn ensure_thread_init() {
+    THREAD_INIT.call_once(|| {
+        unsafe {
+            ffi::XInitThreads();
+            ffi::XSetErrorHandler(Some(x_error_callback));
+        }
+    });
+}
+
+fn with_c_str<F, T>(s: &str, f: F) -> T where F: FnOnce(*const libc::c_char) -> T {
+    use std::ffi::CString;
+    let c_str = CString::new(s.as_bytes().to_vec()).unwrap();
+    f(c_str.as_ptr())
+}
+
+struct XWindow {
+    display: *mut ffi::Display,
+    window: ffi::Window,
+    context: ffi::GLXContext,
+    is_fullscreen: bool,
+    screen_id: libc::c_int,
+    xf86_desk_mode: *mut ffi::XF86VidModeModeInfo,
+    ic: ffi::XIC,
+    im: ffi::XIM,
+}
+
+unsafe impl Send for XWindow {}
+unsafe impl Sync for XWindow {}
+
+unsafe impl Send for Window {}
+unsafe impl Sync for Window {}
+
+impl Drop for XWindow {
+    fn drop(&mut self) {
+        unsafe {
+            // we don't call MakeCurrent(0, 0) because we are not sure that the context
+            // is still the current one
+            ffi::glx::DestroyContext(self.display as *mut _, self.context);
+
+            if self.is_fullscreen {
+                ffi::XF86VidModeSwitchToMode(self.display, self.screen_id, self.xf86_desk_mode);
+                ffi::XF86VidModeSetViewPort(self.display, self.screen_id, 0, 0);
+            }
+
+            ffi::XDestroyIC(self.ic);
+            ffi::XCloseIM(self.im);
+            ffi::XDestroyWindow(self.display, self.window);
+            ffi::XCloseDisplay(self.display);
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct WindowProxy {
+    x: Arc<XWindow>,
+}
+
+impl WindowProxy {
+    pub fn wakeup_event_loop(&self) {
+        let mut xev = ffi::XClientMessageEvent {
+            type_: ffi::ClientMessage,
+            window: self.x.window,
+            format: 32,
+            message_type: 0,
+            serial: 0,
+            send_event: 0,
+            display: self.x.display,
+            data: unsafe { mem::zeroed() },
+        };
+
+        unsafe {
+            ffi::XSendEvent(self.x.display, self.x.window, 0, 0, mem::transmute(&mut xev));
+            ffi::XFlush(self.x.display);
+        }
+    }
+}
+
+pub struct PollEventsIterator<'a> {
+    window: &'a Window,
+}
+
+impl<'a> Iterator for PollEventsIterator<'a> {
+    type Item = Event;
+
+    fn next(&mut self) -> Option<Event> {
+        if let Some(ev) = self.window.pending_events.lock().unwrap().pop_front() {
+            return Some(ev);
+        }
+
+        loop {
+            let mut xev = unsafe { mem::uninitialized() };
+            let res = unsafe { ffi::XCheckMaskEvent(self.window.x.display, -1, &mut xev) };
+
+            if res == 0 {
+                let res = unsafe { ffi::XCheckTypedEvent(self.window.x.display, ffi::ClientMessage, &mut xev) };
+
+                if res == 0 {
+                    return None;
+                }
+            }
+
+            match xev.get_type() {
+                ffi::KeymapNotify => {
+                    unsafe { ffi::XRefreshKeyboardMapping(mem::transmute(&xev)); }
+                },
+
+                ffi::ClientMessage => {
+                    use events::Event::{Closed, Awakened};
+                    use std::sync::atomic::Ordering::Relaxed;
+
+                    let client_msg: &ffi::XClientMessageEvent = unsafe { mem::transmute(&xev) };
+
+                    if client_msg.data.get_long(0) == self.window.wm_delete_window as libc::c_long {
+                        self.window.is_closed.store(true, Relaxed);
+                        return Some(Closed);
+                    } else {
+                        return Some(Awakened);
+                    }
+                },
+
+                ffi::ConfigureNotify => {
+                    use events::Event::Resized;
+                    let cfg_event: &ffi::XConfigureEvent = unsafe { mem::transmute(&xev) };
+                    let (current_width, current_height) = self.window.current_size.get();
+                    if current_width != cfg_event.width || current_height != cfg_event.height {
+                        self.window.current_size.set((cfg_event.width, cfg_event.height));
+                        return Some(Resized(cfg_event.width as u32, cfg_event.height as u32));
+                    }
+                },
+
+                ffi::Expose => {
+                    use events::Event::Refresh;
+                    return Some(Refresh);
+                },
+
+                ffi::MotionNotify => {
+                    use events::Event::MouseMoved;
+                    let event: &ffi::XMotionEvent = unsafe { mem::transmute(&xev) };
+                    return Some(MouseMoved((event.x as i32, event.y as i32)));
+                },
+
+                ffi::KeyPress | ffi::KeyRelease => {
+                    use events::Event::{KeyboardInput, ReceivedCharacter};
+                    use events::ElementState::{Pressed, Released};
+                    let event: &mut ffi::XKeyEvent = unsafe { mem::transmute(&xev) };
+
+                    if event.type_ == ffi::KeyPress {
+                        let raw_ev: *mut ffi::XKeyEvent = event;
+                        unsafe { ffi::XFilterEvent(mem::transmute(raw_ev), self.window.x.window) };
+                    }
+
+                    let state = if xev.get_type() == ffi::KeyPress { Pressed } else { Released };
+
+                    let written = unsafe {
+                        use std::str;
+
+                        let mut buffer: [u8; 16] = [mem::uninitialized(); 16];
+                        let raw_ev: *mut ffi::XKeyEvent = event;
+                        let count = ffi::Xutf8LookupString(self.window.x.ic, mem::transmute(raw_ev),
+                            mem::transmute(buffer.as_mut_ptr()),
+                            buffer.len() as libc::c_int, ptr::null_mut(), ptr::null_mut());
+
+                        str::from_utf8(&buffer[..count as usize]).unwrap_or("").to_string()
+                    };
+
+                    {
+                        let mut pending = self.window.pending_events.lock().unwrap();
+                        for chr in written.chars() {
+                            pending.push_back(ReceivedCharacter(chr));
+                        }
+                    }
+
+                    let keysym = unsafe {
+                        ffi::XKeycodeToKeysym(self.window.x.display, event.keycode as ffi::KeyCode, 0)
+                    };
+
+                    let vkey =  events::keycode_to_element(keysym as libc::c_uint);
+
+                    return Some(KeyboardInput(state, event.keycode as u8, vkey));
+                },
+
+                ffi::ButtonPress | ffi::ButtonRelease => {
+                    use events::Event::{MouseInput, MouseWheel};
+                    use events::ElementState::{Pressed, Released};
+                    use events::MouseButton::{Left, Right, Middle};
+
+                    let event: &ffi::XButtonEvent = unsafe { mem::transmute(&xev) };
+
+                    let state = if xev.get_type() == ffi::ButtonPress { Pressed } else { Released };
+
+                    let button = match event.button {
+                        ffi::Button1 => Some(Left),
+                        ffi::Button2 => Some(Middle),
+                        ffi::Button3 => Some(Right),
+                        ffi::Button4 => {
+                            self.window.pending_events.lock().unwrap().push_back(MouseWheel(1));
+                            None
+                        }
+                        ffi::Button5 => {
+                            self.window.pending_events.lock().unwrap().push_back(MouseWheel(-1));
+                            None
+                        }
+                        _ => None
+                    };
+
+                    match button {
+                        Some(button) =>
+                            return Some(MouseInput(state, button)),
+                        None => ()
+                    };
+                },
+
+                _ => ()
+            };
+        }
+    }
+}
+
+pub struct WaitEventsIterator<'a> {
+    window: &'a Window,
+}
+
+impl<'a> Iterator for WaitEventsIterator<'a> {
+    type Item = Event;
+
+    fn next(&mut self) -> Option<Event> {
+        use std::mem;
+
+        while !self.window.is_closed() {
+            if let Some(ev) = self.window.pending_events.lock().unwrap().pop_front() {
+                return Some(ev);
+            }
+
+            // this will block until an event arrives, but doesn't remove
+            // it from the queue
+            let mut xev = unsafe { mem::uninitialized() };
+            unsafe { ffi::XPeekEvent(self.window.x.display, &mut xev) };
+
+            // calling poll_events()
+            if let Some(ev) = self.window.poll_events().next() {
+                return Some(ev);
+            }
+        }
+
+        None
+    }
+}
+
+pub struct Window {
+    x: Arc<XWindow>,
+    is_closed: AtomicBool,
+    wm_delete_window: ffi::Atom,
+    current_size: Cell<(libc::c_int, libc::c_int)>,
+    pixel_format: PixelFormat,
+    /// Events that have been retreived with XLib but not dispatched with iterators yet
+    pending_events: Mutex<VecDeque<Event>>,
+    cursor_state: Mutex<CursorState>,
+}
+
+impl Window {
+    pub fn new(builder: BuilderAttribs) -> Result<Window, CreationError> {
+        ensure_thread_init();
+        let dimensions = builder.dimensions.unwrap_or((800, 600));
+
+        // calling XOpenDisplay
+        let display = unsafe {
+            let display = ffi::XOpenDisplay(ptr::null());
+            if display.is_null() {
+                return Err(OsError(format!("XOpenDisplay failed")));
+            }
+            display
+        };
+
+        let screen_id = match builder.monitor {
+            Some(MonitorID(monitor)) => monitor as i32,
+            None => unsafe { ffi::XDefaultScreen(display) },
+        };
+
+        // getting the FBConfig
+        let fb_config = unsafe {
+            let mut visual_attributes = vec![
+                ffi::glx::X_RENDERABLE as libc::c_int,  1,
+                ffi::glx::DRAWABLE_TYPE as libc::c_int, ffi::glx::WINDOW_BIT as libc::c_int,
+                ffi::glx::RENDER_TYPE as libc::c_int,   ffi::glx::RGBA_BIT as libc::c_int,
+                ffi::glx::X_VISUAL_TYPE as libc::c_int, ffi::glx::TRUE_COLOR as libc::c_int,
+                ffi::glx::RED_SIZE as libc::c_int,      8,
+                ffi::glx::GREEN_SIZE as libc::c_int,    8,
+                ffi::glx::BLUE_SIZE as libc::c_int,     8,
+                ffi::glx::ALPHA_SIZE as libc::c_int,    8,
+                ffi::glx::DEPTH_SIZE as libc::c_int,    24,
+                ffi::glx::STENCIL_SIZE as libc::c_int,  8,
+                ffi::glx::DOUBLEBUFFER as libc::c_int,  1,
+            ];
+
+            if let Some(val) = builder.multisampling {
+                visual_attributes.push(ffi::glx::SAMPLE_BUFFERS as libc::c_int);
+                visual_attributes.push(1);
+                visual_attributes.push(ffi::glx::SAMPLES as libc::c_int);
+                visual_attributes.push(val as libc::c_int);
+            }
+
+            if let Some(val) = builder.srgb {
+                visual_attributes.push(ffi::glx_extra::FRAMEBUFFER_SRGB_CAPABLE_ARB as libc::c_int);
+                visual_attributes.push(if val {1} else {0});
+            }
+
+            visual_attributes.push(0);
+
+            let mut num_fb: libc::c_int = mem::uninitialized();
+
+            let fb = ffi::glx::ChooseFBConfig(display as *mut _, ffi::XDefaultScreen(display),
+                visual_attributes.as_ptr(), &mut num_fb);
+            if fb.is_null() {
+                return Err(OsError(format!("glx::ChooseFBConfig failed")));
+            }
+            let preferred_fb = *fb;     // TODO: choose more wisely
+            ffi::XFree(fb as *mut _);
+            preferred_fb
+        };
+
+        let mut best_mode = -1;
+        let modes = unsafe {
+            let mut mode_num: libc::c_int = mem::uninitialized();
+            let mut modes: *mut *mut ffi::XF86VidModeModeInfo = mem::uninitialized();
+            if ffi::XF86VidModeGetAllModeLines(display, screen_id, &mut mode_num, &mut modes) == 0 {
+                return Err(OsError(format!("Could not query the video modes")));
+            }
+
+            for i in 0..mode_num {
+                let mode: ffi::XF86VidModeModeInfo = ptr::read(*modes.offset(i as isize) as *const _);
+                if mode.hdisplay == dimensions.0 as u16 && mode.vdisplay == dimensions.1 as u16 {
+                    best_mode = i;
+                }
+            };
+            if best_mode == -1 && builder.monitor.is_some() {
+                return Err(OsError(format!("Could not find a suitable graphics mode")));
+            }
+
+            modes
+        };
+
+        let xf86_desk_mode = unsafe {
+            *modes.offset(0)
+        };
+
+        // getting the visual infos
+        let mut visual_infos: ffi::glx::types::XVisualInfo = unsafe {
+            let vi = ffi::glx::GetVisualFromFBConfig(display as *mut _, fb_config);
+            if vi.is_null() {
+                return Err(OsError(format!("glx::ChooseVisual failed")));
+            }
+            let vi_copy = ptr::read(vi as *const _);
+            ffi::XFree(vi as *mut _);
+            vi_copy
+        };
+
+        // querying the chosen pixel format
+        let pixel_format = {
+            let get_attrib = |attrib: libc::c_int| -> i32 {
+                let mut value = 0;
+                unsafe { ffi::glx::GetFBConfigAttrib(display as *mut _, fb_config, attrib, &mut value); }
+                value
+            };
+
+            PixelFormat {
+                hardware_accelerated: true,
+                red_bits: get_attrib(ffi::glx::RED_SIZE as libc::c_int) as u8,
+                green_bits: get_attrib(ffi::glx::GREEN_SIZE as libc::c_int) as u8,
+                blue_bits: get_attrib(ffi::glx::BLUE_SIZE as libc::c_int) as u8,
+                alpha_bits: get_attrib(ffi::glx::ALPHA_SIZE as libc::c_int) as u8,
+                depth_bits: get_attrib(ffi::glx::DEPTH_SIZE as libc::c_int) as u8,
+                stencil_bits: get_attrib(ffi::glx::STENCIL_SIZE as libc::c_int) as u8,
+                stereoscopy: get_attrib(ffi::glx::STEREO as libc::c_int) != 0,
+                double_buffer: get_attrib(ffi::glx::DOUBLEBUFFER as libc::c_int) != 0,
+                multisampling: if get_attrib(ffi::glx::SAMPLE_BUFFERS as libc::c_int) != 0 {
+                    Some(get_attrib(ffi::glx::SAMPLES as libc::c_int) as u16)
+                }else { None },
+                srgb: get_attrib(ffi::glx_extra::FRAMEBUFFER_SRGB_CAPABLE_ARB as libc::c_int) != 0,
+            }
+        };
+
+        // getting the root window
+        let root = unsafe { ffi::XDefaultRootWindow(display) };
+
+        // creating the color map
+        let cmap = unsafe {
+            let cmap = ffi::XCreateColormap(display, root,
+                visual_infos.visual as *mut _, ffi::AllocNone);
+            // TODO: error checking?
+            cmap
+        };
+
+        // creating
+        let mut set_win_attr = {
+            let mut swa: ffi::XSetWindowAttributes = unsafe { mem::zeroed() };
+            swa.colormap = cmap;
+            swa.event_mask = ffi::ExposureMask | ffi::StructureNotifyMask |
+                ffi::VisibilityChangeMask | ffi::KeyPressMask | ffi::PointerMotionMask |
+                ffi::KeyReleaseMask | ffi::ButtonPressMask |
+                ffi::ButtonReleaseMask | ffi::KeymapStateMask;
+            swa.border_pixel = 0;
+            swa.override_redirect = 0;
+            swa
+        };
+
+        let mut window_attributes = ffi::CWBorderPixel | ffi::CWColormap | ffi:: CWEventMask;
+        if builder.monitor.is_some() {
+            window_attributes |= ffi::CWOverrideRedirect;
+            unsafe {
+                ffi::XF86VidModeSwitchToMode(display, screen_id, *modes.offset(best_mode as isize));
+                ffi::XF86VidModeSetViewPort(display, screen_id, 0, 0);
+                set_win_attr.override_redirect = 1;
+            }
+        }
+
+        // finally creating the window
+        let window = unsafe {
+            let win = ffi::XCreateWindow(display, root, 0, 0, dimensions.0 as libc::c_uint,
+                dimensions.1 as libc::c_uint, 0, visual_infos.depth, ffi::InputOutput as libc::c_uint,
+                visual_infos.visual as *mut _, window_attributes,
+                &mut set_win_attr);
+            win
+        };
+
+        // set visibility
+        if builder.visible {
+            unsafe {
+                ffi::XMapRaised(display, window);
+                ffi::XFlush(display);
+            }
+        }
+
+        // creating window, step 2
+        let wm_delete_window = unsafe {
+            let mut wm_delete_window = with_c_str("WM_DELETE_WINDOW", |delete_window|
+                ffi::XInternAtom(display, delete_window, 0)
+            );
+            ffi::XSetWMProtocols(display, window, &mut wm_delete_window, 1);
+            with_c_str(&*builder.title, |title| {;
+                ffi::XStoreName(display, window, title);
+            });
+            ffi::XFlush(display);
+
+            wm_delete_window
+        };
+
+        // creating IM
+        let im = unsafe {
+            let _lock = GLOBAL_XOPENIM_LOCK.lock().unwrap();
+
+            let im = ffi::XOpenIM(display, ptr::null_mut(), ptr::null_mut(), ptr::null_mut());
+            if im.is_null() {
+                return Err(OsError(format!("XOpenIM failed")));
+            }
+            im
+        };
+
+        // creating input context
+        let ic = unsafe {
+            let ic = with_c_str("inputStyle", |input_style|
+                with_c_str("clientWindow", |client_window|
+                    ffi::XCreateIC(
+                        im, input_style,
+                        ffi::XIMPreeditNothing | ffi::XIMStatusNothing, client_window,
+                        window, ptr::null::<()>()
+                    )
+                )
+            );
+            if ic.is_null() {
+                return Err(OsError(format!("XCreateIC failed")));
+            }
+            ffi::XSetICFocus(ic);
+            ic
+        };
+
+        // Attempt to make keyboard input repeat detectable
+        unsafe {
+            let mut supported_ptr = ffi::False;
+            ffi::XkbSetDetectableAutoRepeat(display, ffi::True, &mut supported_ptr);
+            if supported_ptr == ffi::False {
+                return Err(OsError(format!("XkbSetDetectableAutoRepeat failed")));
+            }
+        }
+
+        // Set ICCCM WM_CLASS property based on initial window title
+        unsafe {
+            with_c_str(&*builder.title, |c_name| {
+                let hint = ffi::XAllocClassHint();
+                (*hint).res_name = c_name as *mut i8;
+                (*hint).res_class = c_name as *mut i8;
+                ffi::XSetClassHint(display, window, hint);
+                ffi::XFree(hint as *mut libc::c_void);
+            });
+        }
+
+        // creating GL context
+        let (context, extra_functions) = unsafe {
+            let mut attributes = Vec::new();
+
+            match builder.gl_version {
+                GlRequest::Latest => {},
+                GlRequest::Specific(Api::OpenGl, (major, minor)) => {
+                    attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
+                    attributes.push(major as libc::c_int);
+                    attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
+                    attributes.push(minor as libc::c_int);
+                },
+                GlRequest::Specific(_, _) => panic!("Only OpenGL is supported"),
+                GlRequest::GlThenGles { opengl_version: (major, minor), .. } => {
+                    attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
+                    attributes.push(major as libc::c_int);
+                    attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
+                    attributes.push(minor as libc::c_int);
+                },
+            }
+
+            if builder.gl_debug {
+                attributes.push(ffi::glx_extra::CONTEXT_FLAGS_ARB as libc::c_int);
+                attributes.push(ffi::glx_extra::CONTEXT_DEBUG_BIT_ARB as libc::c_int);
+            }
+
+            attributes.push(0);
+
+            // loading the extra GLX functions
+            let extra_functions = ffi::glx_extra::Glx::load_with(|addr| {
+                with_c_str(addr, |s| {
+                    use libc;
+                    ffi::glx::GetProcAddress(s as *const u8) as *const libc::c_void
+                })
+            });
+
+            let share = if let Some(win) = builder.sharing {
+                win.x.context
+            } else {
+                ptr::null()
+            };
+
+            let mut context = if extra_functions.CreateContextAttribsARB.is_loaded() {
+                extra_functions.CreateContextAttribsARB(display as *mut ffi::glx_extra::types::Display,
+                    fb_config, share, 1, attributes.as_ptr())
+            } else {
+                ptr::null()
+            };
+
+            if context.is_null() {
+                context = ffi::glx::CreateContext(display as *mut _, &mut visual_infos, share, 1)
+            }
+
+            if context.is_null() {
+                return Err(OsError(format!("GL context creation failed")));
+            }
+
+            (context, extra_functions)
+        };
+
+        // vsync
+        if builder.vsync {
+            unsafe { ffi::glx::MakeCurrent(display as *mut _, window, context) };
+
+            if extra_functions.SwapIntervalEXT.is_loaded() {
+                // this should be the most common extension
+                unsafe {
+                    extra_functions.SwapIntervalEXT(display as *mut _, window, 1);
+                }
+
+                // checking that it worked
+                if builder.strict {
+                    let mut swap = unsafe { mem::uninitialized() };
+                    unsafe {
+                        ffi::glx::QueryDrawable(display as *mut _, window,
+                                                ffi::glx_extra::SWAP_INTERVAL_EXT as i32,
+                                                &mut swap);
+                    }
+
+                    if swap != 1 {
+                        return Err(OsError(format!("Couldn't setup vsync: expected \
+                                                    interval `1` but got `{}`", swap)));
+                    }
+                }
+
+            // GLX_MESA_swap_control is not official
+            /*} else if extra_functions.SwapIntervalMESA.is_loaded() {
+                unsafe {
+                    extra_functions.SwapIntervalMESA(1);
+                }*/
+
+            } else if extra_functions.SwapIntervalSGI.is_loaded() {
+                unsafe {
+                    extra_functions.SwapIntervalSGI(1);
+                }
+
+            } else if builder.strict {
+                return Err(OsError(format!("Couldn't find any available vsync extension")));
+            }
+
+            unsafe { ffi::glx::MakeCurrent(display as *mut _, 0, ptr::null()) };
+        }
+
+        // creating the window object
+        let window = Window {
+            x: Arc::new(XWindow {
+                display: display,
+                window: window,
+                im: im,
+                ic: ic,
+                context: context,
+                screen_id: screen_id,
+                is_fullscreen: builder.monitor.is_some(),
+                xf86_desk_mode: xf86_desk_mode,
+            }),
+            is_closed: AtomicBool::new(false),
+            wm_delete_window: wm_delete_window,
+            current_size: Cell::new((0, 0)),
+            pixel_format: pixel_format,
+            pending_events: Mutex::new(VecDeque::new()),
+            cursor_state: Mutex::new(CursorState::Normal),
+        };
+
+        // returning
+        Ok(window)
+    }
+
+    pub fn is_closed(&self) -> bool {
+        use std::sync::atomic::Ordering::Relaxed;
+        self.is_closed.load(Relaxed)
+    }
+
+    pub fn set_title(&self, title: &str) {
+        with_c_str(title, |title| unsafe {
+            ffi::XStoreName(self.x.display, self.x.window, title);
+            ffi::XFlush(self.x.display);
+        })
+    }
+
+    pub fn show(&self) {
+        unsafe {
+            ffi::XMapRaised(self.x.display, self.x.window);
+            ffi::XFlush(self.x.display);
+        }
+    }
+
+    pub fn hide(&self) {
+        unsafe {
+            ffi::XUnmapWindow(self.x.display, self.x.window);
+            ffi::XFlush(self.x.display);
+        }
+    }
+
+    fn get_geometry(&self) -> Option<(i32, i32, u32, u32, u32)> {
+        unsafe {
+            use std::mem;
+
+            let mut root: ffi::Window = mem::uninitialized();
+            let mut x: libc::c_int = mem::uninitialized();
+            let mut y: libc::c_int = mem::uninitialized();
+            let mut width: libc::c_uint = mem::uninitialized();
+            let mut height: libc::c_uint = mem::uninitialized();
+            let mut border: libc::c_uint = mem::uninitialized();
+            let mut depth: libc::c_uint = mem::uninitialized();
+
+            if ffi::XGetGeometry(self.x.display, self.x.window,
+                &mut root, &mut x, &mut y, &mut width, &mut height,
+                &mut border, &mut depth) == 0
+            {
+                return None;
+            }
+
+            Some((x as i32, y as i32, width as u32, height as u32, border as u32))
+        }
+    }
+
+    pub fn get_position(&self) -> Option<(i32, i32)> {
+        self.get_geometry().map(|(x, y, _, _, _)| (x, y))
+    }
+
+    pub fn set_position(&self, x: i32, y: i32) {
+        unsafe { ffi::XMoveWindow(self.x.display, self.x.window, x as libc::c_int, y as libc::c_int); }
+    }
+
+    pub fn get_inner_size(&self) -> Option<(u32, u32)> {
+        self.get_geometry().map(|(_, _, w, h, _)| (w, h))
+    }
+
+    pub fn get_outer_size(&self) -> Option<(u32, u32)> {
+        self.get_geometry().map(|(_, _, w, h, b)| (w + b, h + b))       // TODO: is this really outside?
+    }
+
+    pub fn set_inner_size(&self, _x: u32, _y: u32) {
+        unimplemented!()
+    }
+
+    pub fn create_window_proxy(&self) -> WindowProxy {
+        WindowProxy {
+            x: self.x.clone()
+        }
+    }
+
+    pub fn poll_events(&self) -> PollEventsIterator {
+        PollEventsIterator {
+            window: self
+        }
+    }
+
+    pub fn wait_events(&self) -> WaitEventsIterator {
+        WaitEventsIterator {
+            window: self
+        }
+    }
+
+    pub unsafe fn make_current(&self) {
+        let res = ffi::glx::MakeCurrent(self.x.display as *mut _, self.x.window, self.x.context);
+        if res == 0 {
+            panic!("glx::MakeCurrent failed");
+        }
+    }
+
+    pub fn is_current(&self) -> bool {
+        unsafe { ffi::glx::GetCurrentContext() == self.x.context }
+    }
+
+    pub fn get_proc_address(&self, addr: &str) -> *const () {
+        use std::mem;
+
+        unsafe {
+            with_c_str(addr, |s| {
+                ffi::glx::GetProcAddress(mem::transmute(s)) as *const ()
+            })
+        }
+    }
+
+    pub fn swap_buffers(&self) {
+        unsafe { ffi::glx::SwapBuffers(self.x.display as *mut _, self.x.window) }
+    }
+
+    pub fn platform_display(&self) -> *mut libc::c_void {
+        self.x.display as *mut libc::c_void
+    }
+
+    pub fn platform_window(&self) -> *mut libc::c_void {
+        unimplemented!()
+    }
+
+    /// See the docs in the crate root file.
+    pub fn get_api(&self) -> ::Api {
+        ::Api::OpenGl
+    }
+
+    pub fn get_pixel_format(&self) -> PixelFormat {
+        self.pixel_format.clone()
+    }
+
+    pub fn set_window_resize_callback(&mut self, _: Option<fn(u32, u32)>) {
+    }
+
+    pub fn set_cursor(&self, cursor: MouseCursor) {
+        unsafe {
+            use std::ffi::CString;
+            let cursor_name = match cursor {
+                MouseCursor::Alias => "link",
+                MouseCursor::Arrow => "arrow",
+                MouseCursor::Cell => "plus",
+                MouseCursor::Copy => "copy",
+                MouseCursor::Crosshair => "crosshair",
+                MouseCursor::Default => "left_ptr",
+                MouseCursor::Grabbing => "grabbing",
+                MouseCursor::Hand | MouseCursor::Grab => "hand",
+                MouseCursor::Help => "question_arrow",
+                MouseCursor::Move => "move",
+                MouseCursor::NoDrop => "circle",
+                MouseCursor::NotAllowed => "crossed_circle",
+                MouseCursor::Progress => "left_ptr_watch",
+
+                /// Resize cursors
+                MouseCursor::EResize => "right_side",
+                MouseCursor::NResize => "top_side",
+                MouseCursor::NeResize => "top_right_corner",
+                MouseCursor::NwResize => "top_left_corner",
+                MouseCursor::SResize => "bottom_side",
+                MouseCursor::SeResize => "bottom_right_corner",
+                MouseCursor::SwResize => "bottom_left_corner",
+                MouseCursor::WResize => "left_side",
+                MouseCursor::EwResize | MouseCursor::ColResize => "h_double_arrow",
+                MouseCursor::NsResize | MouseCursor::RowResize => "v_double_arrow",
+                MouseCursor::NwseResize => "bd_double_arrow",
+                MouseCursor::NeswResize => "fd_double_arrow",
+
+                MouseCursor::Text | MouseCursor::VerticalText => "xterm",
+                MouseCursor::Wait => "watch",
+
+                /// TODO: Find matching X11 cursors
+                MouseCursor::ContextMenu | MouseCursor::NoneCursor |
+                MouseCursor::AllScroll | MouseCursor::ZoomIn |
+                MouseCursor::ZoomOut => "left_ptr",
+            };
+            let c_string = CString::new(cursor_name.as_bytes().to_vec()).unwrap();
+            let xcursor = ffi::XcursorLibraryLoadCursor(self.x.display, c_string.as_ptr());
+            ffi::XDefineCursor (self.x.display, self.x.window, xcursor);
+            ffi::XFlush(self.x.display);
+        }
+    }
+
+    pub fn set_cursor_state(&self, state: CursorState) -> Result<(), String> {
+        let mut cursor_state = self.cursor_state.lock().unwrap();
+
+        match (state, *cursor_state) {
+            (CursorState::Normal, CursorState::Grab) => {
+                unsafe {
+                    ffi::XUngrabPointer(self.x.display, ffi::CurrentTime);
+                    *cursor_state = CursorState::Normal;
+                    Ok(())
+                }
+            },
+
+            (CursorState::Grab, CursorState::Normal) => {
+                unsafe {
+                    *cursor_state = CursorState::Grab;
+
+                    match ffi::XGrabPointer(
+                        self.x.display, self.x.window, ffi::False,
+                        (ffi::ButtonPressMask | ffi::ButtonReleaseMask | ffi::EnterWindowMask |
+                        ffi::LeaveWindowMask | ffi::PointerMotionMask | ffi::PointerMotionHintMask |
+                        ffi::Button1MotionMask | ffi::Button2MotionMask | ffi::Button3MotionMask |
+                        ffi::Button4MotionMask | ffi::Button5MotionMask | ffi::ButtonMotionMask |
+                        ffi::KeymapStateMask) as libc::c_uint,
+                        ffi::GrabModeAsync, ffi::GrabModeAsync,
+                        self.x.window, 0, ffi::CurrentTime
+                    ) {
+                        ffi::GrabSuccess => Ok(()),
+                        ffi::AlreadyGrabbed | ffi::GrabInvalidTime |
+                        ffi::GrabNotViewable | ffi::GrabFrozen
+                            => Err("cursor could not be grabbed".to_string()),
+                        _ => unreachable!(),
+                    }
+                }
+            },
+
+            _ => unimplemented!(),
+        }
+    }
 
-#[cfg(feature = "headless")]
-mod headless;
+    pub fn hidpi_factor(&self) -> f32 {
+        1.0
+    }
 
-#[cfg(feature = "window")]
-mod window;
+    pub fn set_cursor_position(&self, x: i32, y: i32) -> Result<(), ()> {
+        unsafe {
+            ffi::XWarpPointer(self.x.display, 0, self.x.window, 0, 0, 0, 0, x, y);
+        }
 
-#[cfg(not(feature = "window"))]
-pub type Window = ();       // TODO: hack to make things work
-#[cfg(not(feature = "window"))]
-pub type MonitorID = ();       // TODO: hack to make things work
+        Ok(())
+    }
+}