Implement headless rendering

17 files changed, 791 insertions, 518 deletions

diff --git a/.travis.yml b/.travis.yml
index f209793..7b05a9a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,11 @@
 language: rust
 
 install:
-  - sudo apt-get install libXxf86vm-dev
+  - sudo apt-get install libXxf86vm-dev libosmesa6-dev
+
+script:
+  - cargo build --verbose
+  - cargo test --verbose --features "headless" --no-default-features
 
 os:
   - linux
diff --git a/Cargo.toml b/Cargo.toml
index e9bcb98..b50db83 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,7 +5,9 @@ version = "0.0.1"
 authors = ["tomaka <pierre.krieger1708@gmail.com>"]
 
 [features]
-default = ["cocoa"]
+default = ["cocoa", "window"]
+window = []
+headless = []
 
 [dependencies.compile_msg]
 git = "https://github.com/huonw/compile_msg"
diff --git a/examples/fullscreen.rs b/examples/fullscreen.rs
index cbe0303..011a7d3 100644
--- a/examples/fullscreen.rs
+++ b/examples/fullscreen.rs
@@ -14,6 +14,10 @@ mod support;
 #[cfg(target_os = "android")]
 android_start!(main)
 
+#[cfg(not(feature = "window"))]
+fn main() { println!("This example requires glutin to be compiled with the `window` feature"); }
+
+#[cfg(feature = "window")]
 fn main() {
     // enumerating monitors
     let monitor = {
diff --git a/examples/multiwindow.rs b/examples/multiwindow.rs
index ad50312..ab48b6b 100644
--- a/examples/multiwindow.rs
+++ b/examples/multiwindow.rs
@@ -12,6 +12,10 @@ mod support;
 #[cfg(target_os = "android")]
 android_start!(main)
 
+#[cfg(not(feature = "window"))]
+fn main() { println!("This example requires glutin to be compiled with the `window` feature"); }
+
+#[cfg(feature = "window")]
 fn main() {
     let window1 = glutin::Window::new().unwrap();
     let window2 = glutin::Window::new().unwrap();
@@ -30,6 +34,7 @@ fn main() {
     });
 }
 
+#[cfg(feature = "window")]
 fn run(window: glutin::Window, color: (f32, f32, f32, f32)) {
     unsafe { window.make_current() };
 
diff --git a/examples/support/mod.rs b/examples/support/mod.rs
index 154b01e..f27c4e7 100644
--- a/examples/support/mod.rs
+++ b/examples/support/mod.rs
@@ -1,3 +1,5 @@
+#![cfg(feature = "window")]
+
 #[phase(plugin)]
 extern crate gl_generator;
 
diff --git a/examples/window.rs b/examples/window.rs
index b2ad82e..769712a 100644
--- a/examples/window.rs
+++ b/examples/window.rs
@@ -12,6 +12,10 @@ mod support;
 #[cfg(target_os = "android")]
 android_start!(main)
 
+#[cfg(not(feature = "window"))]
+fn main() { println!("This example requires glutin to be compiled with the `window` feature"); }
+
+#[cfg(feature = "window")]
 fn main() {
     let window = glutin::Window::new().unwrap();
 
diff --git a/src/lib.rs b/src/lib.rs
index e41d01e..8a318a5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,4 @@
+#![feature(tuple_indexing)]
 #![feature(unsafe_destructor)]
 #![feature(globs)]
 #![feature(phase)]
@@ -17,6 +18,16 @@
 //!
 //! The second way allows you to customize the way your window and GL context
 //!  will look and behave.
+//!
+//! # Features
+//!
+//! This crate has two Cargo features: `window` and `headless`.
+//!
+//!  - `window` allows you to create regular windows and enables the `WindowBuilder` object.
+//!  - `headless` allows you to do headless rendering, and enables
+//!     the `HeadlessRendererBuilder` object.
+//!
+//! By default only `window` is enabled.
 
 #[phase(plugin)] extern crate compile_msg;
 #[phase(plugin)] extern crate gl_generator;
@@ -55,9 +66,11 @@ mod events;
 compile_error!("Only the `windows`, `linux` and `macos` platforms are supported")
 
 /// Identifier for a monitor.
+#[cfg(feature = "window")]
 pub struct MonitorID(winimpl::MonitorID);
 
 /// Object that allows you to build windows.
+#[cfg(feature = "window")]
 pub struct WindowBuilder {
     dimensions: Option<(uint, uint)>,
     title: String,
@@ -65,6 +78,7 @@ pub struct WindowBuilder {
     gl_version: Option<(uint, uint)>,
 }
 
+#[cfg(feature = "window")]
 impl WindowBuilder {
     /// Initializes a new `WindowBuilder` with default values.
     pub fn new() -> WindowBuilder {
@@ -128,6 +142,41 @@ impl WindowBuilder {
     }
 }
 
+/// Object that allows you to build headless contexts.
+#[cfg(feature = "headless")]
+pub struct HeadlessRendererBuilder {
+    dimensions: (uint, uint),
+    gl_version: Option<(uint, uint)>,
+}
+
+#[cfg(feature = "headless")]
+impl HeadlessRendererBuilder {
+    /// Initializes a new `HeadlessRendererBuilder` with default values.
+    pub fn new(width: uint, height: uint) -> HeadlessRendererBuilder {
+        HeadlessRendererBuilder {
+            dimensions: (width, height),
+            gl_version: None,
+        }
+    }
+
+    /// Requests to use a specific OpenGL version.
+    ///
+    /// Version is a (major, minor) pair. For example to request OpenGL 3.3
+    ///  you would pass `(3, 3)`.
+    pub fn with_gl_version(mut self, version: (uint, uint)) -> HeadlessRendererBuilder {
+        self.gl_version = Some(version);
+        self
+    }
+
+    /// Builds the headless context.
+    ///
+    /// Error should be very rare and only occur in case of permission denied, incompatible system,
+    ///  out of memory, etc.
+    pub fn build(self) -> Result<HeadlessContext, String> {
+        winimpl::HeadlessContext::new(self).map(|w| HeadlessContext { context: w })
+    }
+}
+
 /// Represents an OpenGL context and the Window or environment around it.
 ///
 /// # Example
@@ -150,16 +199,19 @@ impl WindowBuilder {
 ///     std::io::timer::sleep(17);
 /// }
 /// ```
+#[cfg(feature = "window")]
 pub struct Window {
     window: winimpl::Window,
 }
 
+#[cfg(feature = "window")]
 impl Default for Window {
     fn default() -> Window {
         Window::new().unwrap()
     }
 }
 
+#[cfg(feature = "window")]
 impl Window {
     /// Creates a new OpenGL context, and a Window for platforms where this is appropriate.
     ///
@@ -168,6 +220,7 @@ impl Window {
     /// Error should be very rare and only occur in case of permission denied, incompatible system,
     ///  out of memory, etc.
     #[inline]
+    #[cfg(feature = "window")]
     pub fn new() -> Result<Window, String> {
         let builder = WindowBuilder::new();
         builder.build()
@@ -295,6 +348,30 @@ impl Window {
     }
 }
 
+/// Represents a headless OpenGL context.
+#[cfg(feature = "headless")]
+pub struct HeadlessContext {
+    context: winimpl::HeadlessContext,
+}
+
+#[cfg(feature = "headless")]
+impl HeadlessContext {
+    /// Creates a new OpenGL context
+    /// Sets the context as the current context.
+    #[inline]
+    pub unsafe fn make_current(&self) {
+        self.context.make_current()
+    }
+
+    /// Returns the address of an OpenGL function.
+    ///
+    /// Contrary to `wglGetProcAddress`, all available OpenGL functions return an address.
+    #[inline]
+    pub fn get_proc_address(&self, addr: &str) -> *const libc::c_void {
+        self.context.get_proc_address(addr) as *const libc::c_void
+    }
+}
+
 /// An iterator for the `poll_events` function.
 // Implementation note: we retreive the list once, then serve each element by one by one.
 // This may change in the future.
@@ -324,10 +401,12 @@ impl<'a> Iterator<Event> for WaitEventsIterator<'a> {
 /// An iterator for the list of available monitors.
 // Implementation note: we retreive the list once, then serve each element by one by one.
 // This may change in the future.
+#[cfg(feature = "window")]
 pub struct AvailableMonitorsIter {
     data: Vec<winimpl::MonitorID>,
 }
 
+#[cfg(feature = "window")]
 impl Iterator<MonitorID> for AvailableMonitorsIter {
     fn next(&mut self) -> Option<MonitorID> {
         self.data.remove(0).map(|id| MonitorID(id))
@@ -335,16 +414,19 @@ impl Iterator<MonitorID> for AvailableMonitorsIter {
 }
 
 /// Returns the list of all available monitors.
+#[cfg(feature = "window")]
 pub fn get_available_monitors() -> AvailableMonitorsIter {
     let data = winimpl::get_available_monitors();
     AvailableMonitorsIter{ data: data }
 }
 
 /// Returns the primary monitor of the system.
+#[cfg(feature = "window")]
 pub fn get_primary_monitor() -> MonitorID {
     MonitorID(winimpl::get_primary_monitor())
 }
 
+#[cfg(feature = "window")]
 impl MonitorID {
     /// Returns a human-readable name of the monitor.
     pub fn get_name(&self) -> Option<String> {
diff --git a/src/osx/mod.rs b/src/osx/mod.rs
index d41c9c7..78d147f 100644
--- a/src/osx/mod.rs
+++ b/src/osx/mod.rs
@@ -1,4 +1,10 @@
-use {Event, WindowBuilder};
+use Event;
+
+#[cfg(feature = "window")]
+use WindowBuilder;
+
+#[cfg(feature = "headless")]
+use HeadlessRendererBuilder;
 
 use cocoa::base::{id, NSUInteger, nil};
 use cocoa::appkit::*;
@@ -11,6 +17,14 @@ pub struct Window {
     context: id,
 }
 
+pub struct HeadlessContext(Window);
+
+impl Deref<Window> for HeadlessContext {
+    fn deref(&self) -> &Window {
+        &self.0
+    }
+}
+
 pub struct MonitorID;
 
 pub fn get_available_monitors() -> Vec<MonitorID> {
@@ -31,14 +45,28 @@ impl MonitorID {
     }
 }
 
+#[cfg(feature = "window")]
 impl Window {
-    pub fn new(_builder: WindowBuilder) -> Result<Window, String> {
+    pub fn new(builder: WindowBuilder) -> Result<Window, String> {
+        Window::new_impl(builder.dimensions, builder.title.as_slice(), true)
+    }
+}
+
+#[cfg(feature = "headless")]
+impl HeadlessContext {
+    pub fn new(builder: HeadlessRendererBuilder) -> Result<HeadlessContext, String> {
+        Window::new_impl(Some(builder.dimensions), "", false)
+            .map(|w| HeadlessContext(w))
+    }
+}
 
+impl Window {
+    fn new_impl(dimensions: Option<(uint, uint)>, title: &str, visible: bool) -> Result<Window, String> {
         let app = match Window::create_app() {
             Some(app) => app,
             None      => { return Err(format!("Couldn't create NSApplication")); },
         };
-        let window = match Window::create_window(_builder.dimensions.unwrap_or((800, 600)), _builder.title.as_slice()) {
+        let window = match Window::create_window(dimensions.unwrap_or((800, 600)), title) {
             Some(window) => window,
             None         => { return Err(format!("Couldn't create NSWindow")); },
         };
diff --git a/src/win32/init.rs b/src/win32/init.rs
index 7ad4dca..740bc02 100644
--- a/src/win32/init.rs
+++ b/src/win32/init.rs
@@ -6,7 +6,7 @@ use std::sync::atomics::AtomicBool;
 use std::ptr;
 use super::{event, ffi};
 use super::Window;
-use {Event, WindowBuilder};
+use Event;
 
 /// Stores the current window and its events dispatcher.
 /// 
@@ -14,12 +14,16 @@ use {Event, WindowBuilder};
 ///  receive an event for another window.
 local_data_key!(WINDOW: (ffi::HWND, Sender<Event>))
 
-pub fn new_window(builder: WindowBuilder) -> Result<Window, String> {
+pub fn new_window(builder_dimensions: Option<(uint, uint)>, builder_title: String,
+                  builder_monitor: Option<super::MonitorID>,
+                  builder_gl_version: Option<(uint, uint)>,
+                  builder_headless: bool) -> Result<Window, String>
+{
     use std::mem;
     use std::os;
 
     // initializing variables to be sent to the task
-    let title = builder.title.as_slice().utf16_units()
+    let title = builder_title.as_slice().utf16_units()
         .collect::<Vec<u16>>().append_one(0);    // title to utf16
     //let hints = hints.clone();
     let (tx, rx) = channel();
@@ -59,15 +63,15 @@ pub fn new_window(builder: WindowBuilder) -> Result<Window, String> {
 
         // building a RECT object with coordinates
         let mut rect = ffi::RECT {
-            left: 0, right: builder.dimensions.unwrap_or((1024, 768)).val0() as ffi::LONG,
-            top: 0, bottom: builder.dimensions.unwrap_or((1024, 768)).val1() as ffi::LONG,
+            left: 0, right: builder_dimensions.unwrap_or((1024, 768)).val0() as ffi::LONG,
+            top: 0, bottom: builder_dimensions.unwrap_or((1024, 768)).val1() as ffi::LONG,
         };
 
         // switching to fullscreen if necessary
         // this means adjusting the window's position so that it overlaps the right monitor,
         //  and change the monitor's resolution if necessary
-        if builder.monitor.is_some() {
-            let monitor = builder.monitor.as_ref().unwrap();
+        if builder_monitor.is_some() {
+            let monitor = builder_monitor.as_ref().unwrap();
 
             // adjusting the rect
             {
@@ -96,7 +100,7 @@ pub fn new_window(builder: WindowBuilder) -> Result<Window, String> {
         }
 
         // computing the style and extended style of the window
-        let (ex_style, style) = if builder.monitor.is_some() {
+        let (ex_style, style) = if builder_monitor.is_some() {
             (ffi::WS_EX_APPWINDOW, ffi::WS_POPUP | ffi::WS_CLIPSIBLINGS | ffi::WS_CLIPCHILDREN)
         } else {
             (ffi::WS_EX_APPWINDOW | ffi::WS_EX_WINDOWEDGE,
@@ -227,17 +231,23 @@ pub fn new_window(builder: WindowBuilder) -> Result<Window, String> {
 
         // creating the real window this time
         let real_window = unsafe {
-            let (width, height) = if builder.monitor.is_some() || builder.dimensions.is_some() {
+            let (width, height) = if builder_monitor.is_some() || builder_dimensions.is_some() {
                 (Some(rect.right - rect.left), Some(rect.bottom - rect.top))
             } else {
                 (None, None)
             };
 
+            let style = if builder_headless {
+                style
+            } else {
+                style | ffi::WS_VISIBLE
+            };
+
             let handle = ffi::CreateWindowExW(ex_style, class_name.as_ptr(),
                 title.as_ptr() as ffi::LPCWSTR,
-                style | ffi::WS_VISIBLE | ffi::WS_CLIPSIBLINGS | ffi::WS_CLIPCHILDREN,
-                if builder.monitor.is_some() { 0 } else { ffi::CW_USEDEFAULT },
-                if builder.monitor.is_some() { 0 } else { ffi::CW_USEDEFAULT },
+                style | ffi::WS_CLIPSIBLINGS | ffi::WS_CLIPCHILDREN,
+                if builder_monitor.is_some() { 0 } else { ffi::CW_USEDEFAULT },
+                if builder_monitor.is_some() { 0 } else { ffi::CW_USEDEFAULT },
                 width.unwrap_or(ffi::CW_USEDEFAULT), height.unwrap_or(ffi::CW_USEDEFAULT),
                 ptr::null(), ptr::null(), ffi::GetModuleHandleW(ptr::null()),
                 ptr::null_mut());
@@ -280,8 +290,8 @@ pub fn new_window(builder: WindowBuilder) -> Result<Window, String> {
 
             let mut attributes = Vec::new();
 
-            if builder.gl_version.is_some() {
-                let version = builder.gl_version.as_ref().unwrap();
+            if builder_gl_version.is_some() {
+                let version = builder_gl_version.as_ref().unwrap();
                 attributes.push(ffi::wgl_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
                 attributes.push(version.val0() as libc::c_int);
                 attributes.push(ffi::wgl_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
@@ -310,7 +320,7 @@ pub fn new_window(builder: WindowBuilder) -> Result<Window, String> {
         };
 
         // calling SetForegroundWindow if fullscreen
-        if builder.monitor.is_some() {
+        if builder_monitor.is_some() {
             unsafe { ffi::SetForegroundWindow(real_window) };
         }
 
diff --git a/src/win32/mod.rs b/src/win32/mod.rs
index faff374..af28011 100644
--- a/src/win32/mod.rs
+++ b/src/win32/mod.rs
@@ -1,6 +1,12 @@
 use std::sync::atomics::AtomicBool;
 use std::ptr;
-use {Event, WindowBuilder};
+use Event;
+
+#[cfg(feature = "window")]
+use WindowBuilder;
+
+#[cfg(feature = "headless")]
+use HeadlessRendererBuilder;
 
 pub use self::monitor::{MonitorID, get_available_monitors, get_primary_monitor};
 
@@ -9,6 +15,30 @@ mod ffi;
 mod init;
 mod monitor;
 
+/// 
+#[cfg(feature = "headless")]
+pub struct HeadlessContext(Window);
+
+#[cfg(feature = "headless")]
+impl HeadlessContext {
+    /// See the docs in the crate root file.
+    pub fn new(builder: HeadlessRendererBuilder) -> Result<HeadlessContext, String> {
+        let HeadlessRendererBuilder { dimensions, gl_version } = builder;
+        init::new_window(Some(dimensions), "".to_string(), None, gl_version, true)
+            .map(|w| HeadlessContext(w))
+    }
+
+    /// See the docs in the crate root file.
+    pub unsafe fn make_current(&self) {
+        self.0.make_current()
+    }
+
+    /// See the docs in the crate root file.
+    pub fn get_proc_address(&self, addr: &str) -> *const () {
+        self.0.get_proc_address(addr)
+    }
+}
+
 /// The Win32 implementation of the main `Window` object.
 pub struct Window {
     /// Main handle for the window.
@@ -33,12 +63,16 @@ pub struct Window {
     is_closed: AtomicBool,
 }
 
+#[cfg(feature = "window")]
 impl Window {
     /// See the docs in the crate root file.
     pub fn new(builder: WindowBuilder) -> Result<Window, String> {
-        init::new_window(builder)
+        let WindowBuilder { dimensions, title, monitor, gl_version } = builder;
+        init::new_window(dimensions, title, monitor, gl_version, false)
     }
+}
 
+impl Window {
     /// See the docs in the crate root file.
     pub fn is_closed(&self) -> bool {
         use std::sync::atomics::Relaxed;
@@ -200,6 +234,7 @@ impl Window {
     }
 }
 
+#[cfg(feature = "window")]
 #[unsafe_destructor]
 impl Drop for Window {
     fn drop(&mut self) {
diff --git a/src/x11/ffi.rs b/src/x11/ffi.rs
index 1f72943..71a6cd9 100644
--- a/src/x11/ffi.rs
+++ b/src/x11/ffi.rs
@@ -20,6 +20,7 @@ pub type GLXPixmap = XID;
 pub type GLXWindow = XID;
 pub type KeyCode = libc::c_ulong;
 pub type KeySym = XID;
+pub type OSMesaContext = *const ();
 pub type Pixmap = XID;
 pub type Status = libc::c_int;  // TODO: not sure
 pub type Time = libc::c_ulong;
@@ -1356,6 +1357,29 @@ pub struct XF86VidModeModeInfo {
     private: libc::c_long,
 }
 
+#[cfg(feature = "headless")]
+#[link(name = "OSMesa")]
+extern "C" {
+    pub fn OSMesaCreateContext(format: libc::c_uint, sharelist: OSMesaContext) -> OSMesaContext;
+    pub fn OSMesaCreateContextExt(format: libc::c_uint, depthBits: libc::c_int,
+    	stencilBits: libc::c_int, accumBits: libc::c_int, sharelist: OSMesaContext)
+    	-> OSMesaContext;
+    pub fn OSMesaDestroyContext(ctx: OSMesaContext);
+    pub fn OSMesaMakeCurrent(ctx: OSMesaContext, buffer: *mut libc::c_void, type_: libc::c_uint,
+    	width: libc::c_int, height: libc::c_int) -> libc::c_uchar;
+    pub fn OSMesaGetCurrentContext() -> OSMesaContext;
+    pub fn OSMesaPixelStore(pname: libc::c_int, value: libc::c_int);
+    pub fn OSMesaGetIntegerv(pname: libc::c_int, value: *mut libc::c_int);
+    pub fn OSMesaGetDepthBuffer(c: OSMesaContext, width: *mut libc::c_int,
+    	height: *mut libc::c_int, bytesPerValue: *mut libc::c_int,
+    	buffer: *mut *mut libc::c_void);
+    pub fn OSMesaGetColorBuffer(c: OSMesaContext, width: *mut libc::c_int,
+    	height: *mut libc::c_int, format: *mut libc::c_int, buffer: *mut *mut libc::c_void);
+    pub fn OSMesaGetProcAddress(funcName: *const libc::c_char) -> *const libc::c_void;
+    pub fn OSMesaColorClamp(enable: libc::c_uchar);
+}
+
+#[cfg(feature = "window")]
 #[link(name = "GL")]
 #[link(name = "X11")]
 #[link(name = "Xxf86vm")]
diff --git a/src/x11/headless.rs b/src/x11/headless.rs
new file mode 100644
index 0000000..4f4eb16
--- /dev/null
+++ b/src/x11/headless.rs
@@ -0,0 +1,47 @@
+use HeadlessRendererBuilder;
+use libc;
+use std::{mem, ptr};
+use super::ffi;
+
+pub struct HeadlessContext {
+    context: ffi::OSMesaContext,
+    buffer: Vec<u32>,
+    width: uint,
+    height: uint,
+}
+
+impl HeadlessContext {
+    pub fn new(builder: HeadlessRendererBuilder) -> Result<HeadlessContext, String> {
+        Ok(HeadlessContext {
+            width: builder.dimensions.0,
+            height: builder.dimensions.1,
+            buffer: Vec::from_elem(builder.dimensions.0 * builder.dimensions.1, unsafe { mem::uninitialized() }),
+            context: unsafe {
+                // TODO: check errors
+                ffi::OSMesaCreateContext(0x1908, ptr::null())
+            }
+        })
+    }
+
+    pub unsafe fn make_current(&self) {
+        ffi::OSMesaMakeCurrent(self.context,
+            self.buffer.as_ptr() as *mut libc::c_void,
+            0x1401, self.width as libc::c_int, self.height as libc::c_int);
+    }
+
+    pub fn get_proc_address(&self, addr: &str) -> *const () {
+        use std::c_str::ToCStr;
+
+        unsafe {
+            addr.with_c_str(|s| {
+                ffi::OSMesaGetProcAddress(mem::transmute(s)) as *const ()
+            })
+        }
+    }
+}
+
+impl Drop for HeadlessContext {
+    fn drop(&mut self) {
+        unsafe { ffi::OSMesaDestroyContext(self.context) }
+    }
+}
diff --git a/src/x11/mod.rs b/src/x11/mod.rs
index 80a84f7..9d9d25c 100644
--- a/src/x11/mod.rs
+++ b/src/x11/mod.rs
@@ -1,499 +1,13 @@
-use {Event, WindowBuilder};
-use libc;
-use std::{mem, ptr};
-use std::sync::atomics::AtomicBool;
+#[cfg(feature = "headless")]
+pub use self::headless::HeadlessContext;
 
-pub use self::monitor::{MonitorID, get_available_monitors, get_primary_monitor};
+#[cfg(feature = "window")]
+pub use self::window::{Window, MonitorID, get_available_monitors, get_primary_monitor};
 
-mod events;
 mod ffi;
-mod monitor;
 
-pub struct Window {
-    display: *mut ffi::Display,
-    window: ffi::Window,
-    im: ffi::XIM,
-    ic: ffi::XIC,
-    context: ffi::GLXContext,
-    is_closed: AtomicBool,
-    wm_delete_window: ffi::Atom,
-    xf86_desk_mode: *mut ffi::XF86VidModeModeInfo,
-    screen_id: libc::c_int,
-    is_fullscreen: bool,
-}
+#[cfg(feature = "headless")]
+mod headless;
 
-impl Window {
-    pub fn new(builder: WindowBuilder) -> Result<Window, String> {
-        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(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 {
-            static VISUAL_ATTRIBUTES: [libc::c_int, ..23] = [
-                ffi::GLX_X_RENDERABLE,  1,
-                ffi::GLX_DRAWABLE_TYPE, ffi::GLX_WINDOW_BIT,
-                ffi::GLX_RENDER_TYPE,   ffi::GLX_RGBA_BIT,
-                ffi::GLX_X_VISUAL_TYPE, ffi::GLX_TRUE_COLOR,
-                ffi::GLX_RED_SIZE,      8,
-                ffi::GLX_GREEN_SIZE,    8,
-                ffi::GLX_BLUE_SIZE,     8,
-                ffi::GLX_ALPHA_SIZE,    8,
-                ffi::GLX_DEPTH_SIZE,    24,
-                ffi::GLX_STENCIL_SIZE,  8,
-                ffi::GLX_DOUBLEBUFFER,  1,
-                0
-            ];
-
-            let mut num_fb: libc::c_int = mem::uninitialized();
-
-            let fb = ffi::glXChooseFBConfig(display, ffi::XDefaultScreen(display),
-                VISUAL_ATTRIBUTES.as_ptr(), &mut num_fb);
-            if fb.is_null() {
-                return Err(format!("glXChooseFBConfig failed"));
-            }
-            let preferred_fb = *fb;     // TODO: choose more wisely
-            ffi::XFree(fb as *const libc::c_void);
-            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(format!("Could not query the video modes"));
-            }
-
-            for i in range(0, mode_num) {
-                let mode: ffi::XF86VidModeModeInfo = **modes.offset(i as int);
-                if mode.hdisplay == dimensions.val0() as u16 && mode.vdisplay == dimensions.val1() as u16 {
-                    best_mode = i;
-                }
-            };
-            if best_mode == -1 {
-                return Err(format!("Could not find a suitable graphics mode"));
-            }
-
-           modes
-        };
-
-        let xf86_desk_mode = unsafe {
-            *modes.offset(0)
-        };
-
-        // getting the visual infos
-        let visual_infos = unsafe {
-            let vi = ffi::glXGetVisualFromFBConfig(display, fb_config);
-            if vi.is_null() {
-                return Err(format!("glXChooseVisual failed"));
-            }
-            let vi_copy = *vi;
-            ffi::XFree(vi as *const libc::c_void);
-            vi_copy
-        };
-
-        // 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, 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::ResizeRedirectMask |
-                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 int));
-                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.val0() as libc::c_uint,
-                dimensions.val1() as libc::c_uint, 0, visual_infos.depth, ffi::InputOutput,
-                visual_infos.visual, window_attributes,
-                &mut set_win_attr);
-            win
-        };
-
-        // creating window, step 2
-        let wm_delete_window = unsafe {
-            use std::c_str::ToCStr;
-
-            ffi::XMapWindow(display, window);
-            let mut wm_delete_window = ffi::XInternAtom(display,
-                "WM_DELETE_WINDOW".to_c_str().as_ptr() as *const libc::c_char, 0);
-            ffi::XSetWMProtocols(display, window, &mut wm_delete_window, 1);
-            ffi::XStoreName(display, window, mem::transmute(builder.title.as_slice().as_ptr()));
-            ffi::XFlush(display);
-
-            wm_delete_window
-        };
-
-        // getting the pointer to glXCreateContextAttribs
-        let create_context_attribs = unsafe {
-            let mut addr = ffi::glXGetProcAddress(b"glXCreateContextAttribs".as_ptr()
-                as *const u8) as *const ();
-
-            if addr.is_null() {
-                addr = ffi::glXGetProcAddress(b"glXCreateContextAttribsARB".as_ptr()
-                    as *const u8) as *const ();
-            }
-
-            addr.as_ref().map(|addr| {
-                let addr: extern "system" fn(*mut ffi::Display, ffi::GLXFBConfig, ffi::GLXContext,
-                    ffi::Bool, *const libc::c_int) -> ffi::GLXContext = mem::transmute(addr);
-                addr
-            })
-        };
-
-        // creating IM
-        let im = unsafe {
-            let im = ffi::XOpenIM(display, ptr::null(), ptr::null_mut(), ptr::null_mut());
-            if im.is_null() {
-                return Err(format!("XOpenIM failed"));
-            }
-            im
-        };
-
-        // creating input context
-        let ic = unsafe {
-            use std::c_str::ToCStr;
-
-            let ic = ffi::XCreateIC(im, "inputStyle".to_c_str().as_ptr(),
-                ffi::XIMPreeditNothing | ffi::XIMStatusNothing, "clientWindow".to_c_str().as_ptr(),
-                window, ptr::null());
-            if ic.is_null() {
-                return Err(format!("XCreateIC failed"));
-            }
-            ffi::XSetICFocus(ic);
-            ic
-        };
-
-        // Attempt to make keyboard input repeat detectable
-        unsafe {
-            let mut supported_ptr = false;
-            ffi::XkbSetDetectableAutoRepeat(display, true, &mut supported_ptr);
-            if !supported_ptr {
-                return Err(format!("XkbSetDetectableAutoRepeat failed"));
-            }
-        }
-
-
-        // creating GL context
-        let context = unsafe {
-            let mut attributes = Vec::new();
-
-            if builder.gl_version.is_some() {
-                let version = builder.gl_version.as_ref().unwrap();
-                attributes.push(ffi::GLX_CONTEXT_MAJOR_VERSION);
-                attributes.push(version.val0() as libc::c_int);
-                attributes.push(ffi::GLX_CONTEXT_MINOR_VERSION);
-                attributes.push(version.val1() as libc::c_int);
-            }
-
-            attributes.push(0);
-
-            let context = if create_context_attribs.is_some() {
-                let create_context_attribs = create_context_attribs.unwrap();
-                create_context_attribs(display, fb_config, ptr::null(), 1,
-                    attributes.as_ptr())
-            } else {
-                ffi::glXCreateContext(display, &visual_infos, ptr::null(), 1)
-            };
-
-            if context.is_null() {
-                return Err(format!("GL context creation failed"));
-            }
-
-            context
-        };
-
-        // creating the window object
-        let window = Window {
-            display: display,
-            window: window,
-            im: im,
-            ic: ic,
-            context: context,
-            is_closed: AtomicBool::new(false),
-            wm_delete_window: wm_delete_window,
-            xf86_desk_mode: xf86_desk_mode,
-            screen_id: screen_id,
-            is_fullscreen: builder.monitor.is_some(),
-        };
-
-        // calling glViewport
-        unsafe {
-            let ptr = window.get_proc_address("glViewport");
-            assert!(!ptr.is_null());
-            let ptr: extern "system" fn(libc::c_int, libc::c_int, libc::c_int, libc::c_int) =
-                mem::transmute(ptr);
-            let dimensions = window.get_inner_size().unwrap();
-            ptr(0, 0, dimensions.val0() as libc::c_int, dimensions.val1() as libc::c_int);
-        }
-
-        // returning
-        Ok(window)
-    }
-
-    pub fn is_closed(&self) -> bool {
-        use std::sync::atomics::Relaxed;
-        self.is_closed.load(Relaxed)
-    }
-
-    pub fn set_title(&self, title: &str) {
-        unsafe {
-            ffi::XStoreName(self.display, self.window,
-                mem::transmute(title.as_slice().as_ptr()));
-        }
-    }
-
-    fn get_geometry(&self) -> Option<(int, int, uint, uint)> {
-        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.display, self.window,
-                &mut root, &mut x, &mut y, &mut width, &mut height,
-                &mut border, &mut depth) == 0
-            {
-                return None;
-            }
-
-            Some((x as int, y as int, width as uint, height as uint))
-        }
-    }
-
-    pub fn get_position(&self) -> Option<(int, int)> {
-        self.get_geometry().map(|(x, y, _, _)| (x, y))
-    }
-
-    pub fn set_position(&self, x: int, y: int) {
-        unsafe { ffi::XMoveWindow(self.display, self.window, x as libc::c_int, y as libc::c_int) }
-    }
-
-    pub fn get_inner_size(&self) -> Option<(uint, uint)> {
-        self.get_geometry().map(|(_, _, w, h)| (w, h))
-    }
-
-    pub fn get_outer_size(&self) -> Option<(uint, uint)> {
-        unimplemented!()
-    }
-
-    pub fn set_inner_size(&self, _x: uint, _y: uint) {
-        unimplemented!()
-    }
-
-    pub fn poll_events(&self) -> Vec<Event> {
-        use std::mem;
-
-        let mut events = Vec::new();
-
-        loop {
-            use std::num::Bounded;
-
-            let mut xev = unsafe { mem::uninitialized() };
-            let res = unsafe { ffi::XCheckMaskEvent(self.display, Bounded::max_value(), &mut xev) };
-
-            if res == 0 {
-                let res = unsafe { ffi::XCheckTypedEvent(self.display, ffi::ClientMessage, &mut xev) };
-
-                if res == 0 {
-                    break
-                }
-            }
-
-            match xev.type_ {
-                ffi::KeymapNotify => {
-                    unsafe { ffi::XRefreshKeyboardMapping(&xev) }
-                },
-
-                ffi::ClientMessage => {
-                    use Closed;
-                    use std::sync::atomics::Relaxed;
-
-                    let client_msg: &ffi::XClientMessageEvent = unsafe { mem::transmute(&xev) };
-
-                    if client_msg.l[0] == self.wm_delete_window as libc::c_long {
-                        self.is_closed.store(true, Relaxed);
-                        events.push(Closed);
-                    }
-                },
-
-                ffi::ResizeRequest => {
-                    use Resized;
-                    let rs_event: &ffi::XResizeRequestEvent = unsafe { mem::transmute(&xev) };
-                    events.push(Resized(rs_event.width as uint, rs_event.height as uint));
-                },
-
-                ffi::MotionNotify => {
-                    use MouseMoved;
-                    let event: &ffi::XMotionEvent = unsafe { mem::transmute(&xev) };
-                    events.push(MouseMoved((event.x as int, event.y as int)));
-                },
-
-                ffi::KeyPress | ffi::KeyRelease => {
-                    use {KeyboardInput, Pressed, Released, ReceivedCharacter, KeyModifiers};
-                    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) };
-                    }
-
-                    let state = if xev.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.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.as_slice().slice_to(count as uint))
-                            .unwrap_or("").to_string()
-                    };
-
-                    for chr in written.as_slice().chars() {
-                        events.push(ReceivedCharacter(chr));
-                    }
-
-                    let keysym = unsafe {
-                        ffi::XKeycodeToKeysym(self.display, event.keycode as ffi::KeyCode, 0)
-                    };
-
-                    let vkey =  events::keycode_to_element(keysym as libc::c_uint);
-
-                    events.push(KeyboardInput(state, event.keycode as u8,
-                        vkey, KeyModifiers::empty()));
-                    //
-                },
-
-                ffi::ButtonPress | ffi::ButtonRelease => {
-                    use {MouseInput, Pressed, Released};
-                    use {LeftMouseButton, RightMouseButton, MiddleMouseButton, OtherMouseButton};
-                    let event: &ffi::XButtonEvent = unsafe { mem::transmute(&xev) };
-
-                    let state = if xev.type_ == ffi::ButtonPress { Pressed } else { Released };
-
-                    let button = match event.button {
-                        ffi::Button1 => Some(LeftMouseButton),
-                        ffi::Button2 => Some(MiddleMouseButton),
-                        ffi::Button3 => Some(RightMouseButton),
-                        ffi::Button4 => Some(OtherMouseButton(4)),
-                        ffi::Button5 => Some(OtherMouseButton(5)),
-                        _ => None
-                    };
-
-                    match button {
-                        Some(button) =>
-                            events.push(MouseInput(state, button)),
-                        None => ()
-                    };
-                },
-
-                _ => ()
-            }
-        }
-
-        events
-    }
-
-    pub fn wait_events(&self) -> Vec<Event> {
-        use std::mem;
-
-        loop {
-            // 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.display, &mut xev) };
-
-            // calling poll_events()
-            let ev = self.poll_events();
-            if ev.len() >= 1 {
-                return ev;
-            }
-        }
-    }
-
-    pub unsafe fn make_current(&self) {
-        let res = ffi::glXMakeCurrent(self.display, self.window, self.context);
-        if res == 0 {
-            fail!("glXMakeCurrent failed");
-        }
-    }
-
-    pub fn get_proc_address(&self, addr: &str) -> *const () {
-        use std::c_str::ToCStr;
-        use std::mem;
-
-        unsafe {
-            addr.with_c_str(|s| {
-                ffi::glXGetProcAddress(mem::transmute(s)) as *const ()
-            })
-        }
-    }
-
-    pub fn swap_buffers(&self) {
-        unsafe { ffi::glXSwapBuffers(self.display, self.window) }
-    }
-}
-
-impl Drop for Window {
-    fn drop(&mut self) {
-        unsafe { ffi::glXMakeCurrent(self.display, 0, ptr::null()); }
-        unsafe { ffi::glXDestroyContext(self.display, self.context); }
-
-        if self.is_fullscreen {
-            unsafe { ffi::XF86VidModeSwitchToMode(self.display, self.screen_id, self.xf86_desk_mode); }
-            unsafe { ffi::XF86VidModeSetViewPort(self.display, self.screen_id, 0, 0); }
-        }
-
-        unsafe { ffi::XDestroyIC(self.ic); }
-        unsafe { ffi::XCloseIM(self.im); }
-        unsafe { ffi::XDestroyWindow(self.display, self.window); }
-        unsafe { ffi::XCloseDisplay(self.display); }
-    }
-}
+#[cfg(feature = "window")]
+mod window;
diff --git a/src/x11/events.rs b/src/x11/window/events.rs
index d5b559a..4d74eed 100644
--- a/src/x11/events.rs
+++ b/src/x11/window/events.rs
@@ -1,5 +1,5 @@
 use {events, libc};
-use super::ffi;
+use super::super::ffi;
 use VirtualKeyCode;
 
 pub fn keycode_to_element(scancode: libc::c_uint) -> Option<VirtualKeyCode> {
diff --git a/src/x11/window/mod.rs b/src/x11/window/mod.rs
new file mode 100644
index 0000000..58439e8
--- /dev/null
+++ b/src/x11/window/mod.rs
@@ -0,0 +1,499 @@
+use {Event, WindowBuilder};
+use libc;
+use std::{mem, ptr};
+use std::sync::atomics::AtomicBool;
+use super::ffi;
+
+pub use self::monitor::{MonitorID, get_available_monitors, get_primary_monitor};
+
+mod events;
+mod monitor;
+
+pub struct Window {
+    display: *mut ffi::Display,
+    window: ffi::Window,
+    im: ffi::XIM,
+    ic: ffi::XIC,
+    context: ffi::GLXContext,
+    is_closed: AtomicBool,
+    wm_delete_window: ffi::Atom,
+    xf86_desk_mode: *mut ffi::XF86VidModeModeInfo,
+    screen_id: libc::c_int,
+    is_fullscreen: bool,
+}
+
+impl Window {
+    pub fn new(builder: WindowBuilder) -> Result<Window, String> {
+        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(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 {
+            static VISUAL_ATTRIBUTES: [libc::c_int, ..23] = [
+                ffi::GLX_X_RENDERABLE,  1,
+                ffi::GLX_DRAWABLE_TYPE, ffi::GLX_WINDOW_BIT,
+                ffi::GLX_RENDER_TYPE,   ffi::GLX_RGBA_BIT,
+                ffi::GLX_X_VISUAL_TYPE, ffi::GLX_TRUE_COLOR,
+                ffi::GLX_RED_SIZE,      8,
+                ffi::GLX_GREEN_SIZE,    8,
+                ffi::GLX_BLUE_SIZE,     8,
+                ffi::GLX_ALPHA_SIZE,    8,
+                ffi::GLX_DEPTH_SIZE,    24,
+                ffi::GLX_STENCIL_SIZE,  8,
+                ffi::GLX_DOUBLEBUFFER,  1,
+                0
+            ];
+
+            let mut num_fb: libc::c_int = mem::uninitialized();
+
+            let fb = ffi::glXChooseFBConfig(display, ffi::XDefaultScreen(display),
+                VISUAL_ATTRIBUTES.as_ptr(), &mut num_fb);
+            if fb.is_null() {
+                return Err(format!("glXChooseFBConfig failed"));
+            }
+            let preferred_fb = *fb;     // TODO: choose more wisely
+            ffi::XFree(fb as *const libc::c_void);
+            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(format!("Could not query the video modes"));
+            }
+
+            for i in range(0, mode_num) {
+                let mode: ffi::XF86VidModeModeInfo = **modes.offset(i as int);
+                if mode.hdisplay == dimensions.val0() as u16 && mode.vdisplay == dimensions.val1() as u16 {
+                    best_mode = i;
+                }
+            };
+            if best_mode == -1 {
+                return Err(format!("Could not find a suitable graphics mode"));
+            }
+
+           modes
+        };
+
+        let xf86_desk_mode = unsafe {
+            *modes.offset(0)
+        };
+
+        // getting the visual infos
+        let visual_infos = unsafe {
+            let vi = ffi::glXGetVisualFromFBConfig(display, fb_config);
+            if vi.is_null() {
+                return Err(format!("glXChooseVisual failed"));
+            }
+            let vi_copy = *vi;
+            ffi::XFree(vi as *const libc::c_void);
+            vi_copy
+        };
+
+        // 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, 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::ResizeRedirectMask |
+                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 int));
+                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.val0() as libc::c_uint,
+                dimensions.val1() as libc::c_uint, 0, visual_infos.depth, ffi::InputOutput,
+                visual_infos.visual, window_attributes,
+                &mut set_win_attr);
+            win
+        };
+
+        // creating window, step 2
+        let wm_delete_window = unsafe {
+            use std::c_str::ToCStr;
+
+            ffi::XMapWindow(display, window);
+            let mut wm_delete_window = ffi::XInternAtom(display,
+                "WM_DELETE_WINDOW".to_c_str().as_ptr() as *const libc::c_char, 0);
+            ffi::XSetWMProtocols(display, window, &mut wm_delete_window, 1);
+            ffi::XStoreName(display, window, mem::transmute(builder.title.as_slice().as_ptr()));
+            ffi::XFlush(display);
+
+            wm_delete_window
+        };
+
+        // getting the pointer to glXCreateContextAttribs
+        let create_context_attribs = unsafe {
+            let mut addr = ffi::glXGetProcAddress(b"glXCreateContextAttribs".as_ptr()
+                as *const u8) as *const ();
+
+            if addr.is_null() {
+                addr = ffi::glXGetProcAddress(b"glXCreateContextAttribsARB".as_ptr()
+                    as *const u8) as *const ();
+            }
+
+            addr.as_ref().map(|addr| {
+                let addr: extern "system" fn(*mut ffi::Display, ffi::GLXFBConfig, ffi::GLXContext,
+                    ffi::Bool, *const libc::c_int) -> ffi::GLXContext = mem::transmute(addr);
+                addr
+            })
+        };
+
+        // creating IM
+        let im = unsafe {
+            let im = ffi::XOpenIM(display, ptr::null(), ptr::null_mut(), ptr::null_mut());
+            if im.is_null() {
+                return Err(format!("XOpenIM failed"));
+            }
+            im
+        };
+
+        // creating input context
+        let ic = unsafe {
+            use std::c_str::ToCStr;
+
+            let ic = ffi::XCreateIC(im, "inputStyle".to_c_str().as_ptr(),
+                ffi::XIMPreeditNothing | ffi::XIMStatusNothing, "clientWindow".to_c_str().as_ptr(),
+                window, ptr::null());
+            if ic.is_null() {
+                return Err(format!("XCreateIC failed"));
+            }
+            ffi::XSetICFocus(ic);
+            ic
+        };
+
+        // Attempt to make keyboard input repeat detectable
+        unsafe {
+            let mut supported_ptr = false;
+            ffi::XkbSetDetectableAutoRepeat(display, true, &mut supported_ptr);
+            if !supported_ptr {
+                return Err(format!("XkbSetDetectableAutoRepeat failed"));
+            }
+        }
+
+
+        // creating GL context
+        let context = unsafe {
+            let mut attributes = Vec::new();
+
+            if builder.gl_version.is_some() {
+                let version = builder.gl_version.as_ref().unwrap();
+                attributes.push(ffi::GLX_CONTEXT_MAJOR_VERSION);
+                attributes.push(version.val0() as libc::c_int);
+                attributes.push(ffi::GLX_CONTEXT_MINOR_VERSION);
+                attributes.push(version.val1() as libc::c_int);
+            }
+
+            attributes.push(0);
+
+            let context = if create_context_attribs.is_some() {
+                let create_context_attribs = create_context_attribs.unwrap();
+                create_context_attribs(display, fb_config, ptr::null(), 1,
+                    attributes.as_ptr())
+            } else {
+                ffi::glXCreateContext(display, &visual_infos, ptr::null(), 1)
+            };
+
+            if context.is_null() {
+                return Err(format!("GL context creation failed"));
+            }
+
+            context
+        };
+
+        // creating the window object
+        let window = Window {
+            display: display,
+            window: window,
+            im: im,
+            ic: ic,
+            context: context,
+            is_closed: AtomicBool::new(false),
+            wm_delete_window: wm_delete_window,
+            xf86_desk_mode: xf86_desk_mode,
+            screen_id: screen_id,
+            is_fullscreen: builder.monitor.is_some(),
+        };
+
+        // calling glViewport
+        unsafe {
+            let ptr = window.get_proc_address("glViewport");
+            assert!(!ptr.is_null());
+            let ptr: extern "system" fn(libc::c_int, libc::c_int, libc::c_int, libc::c_int) =
+                mem::transmute(ptr);
+            let dimensions = window.get_inner_size().unwrap();
+            ptr(0, 0, dimensions.val0() as libc::c_int, dimensions.val1() as libc::c_int);
+        }
+
+        // returning
+        Ok(window)
+    }
+
+    pub fn is_closed(&self) -> bool {
+        use std::sync::atomics::Relaxed;
+        self.is_closed.load(Relaxed)
+    }
+
+    pub fn set_title(&self, title: &str) {
+        unsafe {
+            ffi::XStoreName(self.display, self.window,
+                mem::transmute(title.as_slice().as_ptr()));
+        }
+    }
+
+    fn get_geometry(&self) -> Option<(int, int, uint, uint)> {
+        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.display, self.window,
+                &mut root, &mut x, &mut y, &mut width, &mut height,
+                &mut border, &mut depth) == 0
+            {
+                return None;
+            }
+
+            Some((x as int, y as int, width as uint, height as uint))
+        }
+    }
+
+    pub fn get_position(&self) -> Option<(int, int)> {
+        self.get_geometry().map(|(x, y, _, _)| (x, y))
+    }
+
+    pub fn set_position(&self, x: int, y: int) {
+        unsafe { ffi::XMoveWindow(self.display, self.window, x as libc::c_int, y as libc::c_int) }
+    }
+
+    pub fn get_inner_size(&self) -> Option<(uint, uint)> {
+        self.get_geometry().map(|(_, _, w, h)| (w, h))
+    }
+
+    pub fn get_outer_size(&self) -> Option<(uint, uint)> {
+        unimplemented!()
+    }
+
+    pub fn set_inner_size(&self, _x: uint, _y: uint) {
+        unimplemented!()
+    }
+
+    pub fn poll_events(&self) -> Vec<Event> {
+        use std::mem;
+
+        let mut events = Vec::new();
+
+        loop {
+            use std::num::Bounded;
+
+            let mut xev = unsafe { mem::uninitialized() };
+            let res = unsafe { ffi::XCheckMaskEvent(self.display, Bounded::max_value(), &mut xev) };
+
+            if res == 0 {
+                let res = unsafe { ffi::XCheckTypedEvent(self.display, ffi::ClientMessage, &mut xev) };
+
+                if res == 0 {
+                    break
+                }
+            }
+
+            match xev.type_ {
+                ffi::KeymapNotify => {
+                    unsafe { ffi::XRefreshKeyboardMapping(&xev) }
+                },
+
+                ffi::ClientMessage => {
+                    use Closed;
+                    use std::sync::atomics::Relaxed;
+
+                    let client_msg: &ffi::XClientMessageEvent = unsafe { mem::transmute(&xev) };
+
+                    if client_msg.l[0] == self.wm_delete_window as libc::c_long {
+                        self.is_closed.store(true, Relaxed);
+                        events.push(Closed);
+                    }
+                },
+
+                ffi::ResizeRequest => {
+                    use Resized;
+                    let rs_event: &ffi::XResizeRequestEvent = unsafe { mem::transmute(&xev) };
+                    events.push(Resized(rs_event.width as uint, rs_event.height as uint));
+                },
+
+                ffi::MotionNotify => {
+                    use MouseMoved;
+                    let event: &ffi::XMotionEvent = unsafe { mem::transmute(&xev) };
+                    events.push(MouseMoved((event.x as int, event.y as int)));
+                },
+
+                ffi::KeyPress | ffi::KeyRelease => {
+                    use {KeyboardInput, Pressed, Released, ReceivedCharacter, KeyModifiers};
+                    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) };
+                    }
+
+                    let state = if xev.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.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.as_slice().slice_to(count as uint))
+                            .unwrap_or("").to_string()
+                    };
+
+                    for chr in written.as_slice().chars() {
+                        events.push(ReceivedCharacter(chr));
+                    }
+
+                    let keysym = unsafe {
+                        ffi::XKeycodeToKeysym(self.display, event.keycode as ffi::KeyCode, 0)
+                    };
+
+                    let vkey =  events::keycode_to_element(keysym as libc::c_uint);
+
+                    events.push(KeyboardInput(state, event.keycode as u8,
+                        vkey, KeyModifiers::empty()));
+                    //
+                },
+
+                ffi::ButtonPress | ffi::ButtonRelease => {
+                    use {MouseInput, Pressed, Released};
+                    use {LeftMouseButton, RightMouseButton, MiddleMouseButton, OtherMouseButton};
+                    let event: &ffi::XButtonEvent = unsafe { mem::transmute(&xev) };
+
+                    let state = if xev.type_ == ffi::ButtonPress { Pressed } else { Released };
+
+                    let button = match event.button {
+                        ffi::Button1 => Some(LeftMouseButton),
+                        ffi::Button2 => Some(MiddleMouseButton),
+                        ffi::Button3 => Some(RightMouseButton),
+                        ffi::Button4 => Some(OtherMouseButton(4)),
+                        ffi::Button5 => Some(OtherMouseButton(5)),
+                        _ => None
+                    };
+
+                    match button {
+                        Some(button) =>
+                            events.push(MouseInput(state, button)),
+                        None => ()
+                    };
+                },
+
+                _ => ()
+            }
+        }
+
+        events
+    }
+
+    pub fn wait_events(&self) -> Vec<Event> {
+        use std::mem;
+
+        loop {
+            // 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.display, &mut xev) };
+
+            // calling poll_events()
+            let ev = self.poll_events();
+            if ev.len() >= 1 {
+                return ev;
+            }
+        }
+    }
+
+    pub unsafe fn make_current(&self) {
+        let res = ffi::glXMakeCurrent(self.display, self.window, self.context);
+        if res == 0 {
+            fail!("glXMakeCurrent failed");
+        }
+    }
+
+    pub fn get_proc_address(&self, addr: &str) -> *const () {
+        use std::c_str::ToCStr;
+        use std::mem;
+
+        unsafe {
+            addr.with_c_str(|s| {
+                ffi::glXGetProcAddress(mem::transmute(s)) as *const ()
+            })
+        }
+    }
+
+    pub fn swap_buffers(&self) {
+        unsafe { ffi::glXSwapBuffers(self.display, self.window) }
+    }
+}
+
+impl Drop for Window {
+    fn drop(&mut self) {
+        unsafe { ffi::glXMakeCurrent(self.display, 0, ptr::null()); }
+        unsafe { ffi::glXDestroyContext(self.display, self.context); }
+
+        if self.is_fullscreen {
+            unsafe { ffi::XF86VidModeSwitchToMode(self.display, self.screen_id, self.xf86_desk_mode); }
+            unsafe { ffi::XF86VidModeSetViewPort(self.display, self.screen_id, 0, 0); }
+        }
+
+        unsafe { ffi::XDestroyIC(self.ic); }
+        unsafe { ffi::XCloseIM(self.im); }
+        unsafe { ffi::XDestroyWindow(self.display, self.window); }
+        unsafe { ffi::XCloseDisplay(self.display); }
+    }
+}
diff --git a/src/x11/monitor.rs b/src/x11/window/monitor.rs
index 3b382c2..b72ed15 100644
--- a/src/x11/monitor.rs
+++ b/src/x11/window/monitor.rs
@@ -1,5 +1,5 @@
 use std::{ptr};
-use super::ffi;
+use super::super::ffi;
 
 pub struct MonitorID(pub uint);
 
diff --git a/tests/headless.rs b/tests/headless.rs
new file mode 100644
index 0000000..b9ae598
--- /dev/null
+++ b/tests/headless.rs
@@ -0,0 +1,13 @@
+#![feature(phase)]
+#![feature(tuple_indexing)]
+
+extern crate glutin;
+
+#[cfg(feature = "headless")]
+#[test]
+fn main() {
+    let window = glutin::HeadlessRendererBuilder::new(1024, 768).build().unwrap();
+
+    unsafe { window.make_current() };
+
+}