Merge pull request #32 from BillyDM/master

Add beginnings of cross-platform window events struct and AppWindow trait.

Cargo.toml

@@ -6,21 +6,22 @@ authors = [
     "Charles Saracco <crsaracco@gmail.com>",
     "Mirko Covizzi <mrkcvzz@gmail.com>",
     "Micah Johnston <micah@glowcoil.com>",
+    "Billy Messenger <billydm@protonmail.com>",
 ]
 edition = "2018"
 
 [dependencies]
-gl = "0.14.0"
+log = "0.4.11"
-log = "0.4.8"
+raw-window-handle = "0.3.3"
 
 [target.'cfg(target_os="linux")'.dependencies]
 xcb = { version = "0.9", features = ["thread", "xlib_xcb", "dri2"] }
-x11 = { version = "2.3", features = ["xlib", "glx"]}
+x11 = { version = "2.18", features = ["xlib"] }
 libc = "0.2"
 
 [target.'cfg(target_os="windows")'.dependencies]
 winapi = { version = "0.3.8", features = ["libloaderapi", "winuser", "windef", "minwindef", "guiddef", "combaseapi", "wingdi", "errhandlingapi"] }
 
 [target.'cfg(target_os="macos")'.dependencies]
-cocoa = "0.20.1"
+cocoa = "0.23.0"
 objc = "0.2.7"

examples/open_window.rs

@@ -1,3 +1,7 @@
+use std::sync::mpsc;
+
+use baseview::Event;
+
 fn main() {
     let window_open_options = baseview::WindowOpenOptions {
         title: "baseview",
@@ -6,5 +10,64 @@ fn main() {
         parent: baseview::Parent::None,
     };
 
-    baseview::Window::open(window_open_options);
+    let (_app_message_tx, app_message_rx) = mpsc::channel::<()>();
+
+    // Send _app_message_tx to a separate thread, then send messages to the GUI thread.
+
+    let _ = baseview::Window::<MyProgram>::open(window_open_options, app_message_rx);
+}
+struct MyProgram {}
+
+impl baseview::AppWindow for MyProgram {
+    type AppMessage = ();
+
+    fn build(_window_handle: baseview::RawWindow, window_info: &baseview::WindowInfo) -> Self {
+        println!("Window info: {:?}", window_info);
+        Self {}
+    }
+
+    fn draw(&mut self) {}
+
+    fn on_event(&mut self, event: Event) {
+        match event {
+            Event::CursorMotion(x, y) => {
+                println!("Cursor moved, x: {}, y: {}", x, y);
+            }
+            Event::MouseDown(button_id) => {
+                println!("Mouse down, button id: {:?}", button_id);
+            }
+            Event::MouseUp(button_id) => {
+                println!("Mouse up, button id: {:?}", button_id);
+            }
+            Event::MouseScroll(mouse_scroll) => {
+                println!("Mouse scroll, {:?}", mouse_scroll);
+            }
+            Event::MouseClick(mouse_click) => {
+                println!("Mouse click, {:?}", mouse_click);
+            }
+            Event::KeyDown(keycode) => {
+                println!("Key down, keycode: {}", keycode);
+            }
+            Event::KeyUp(keycode) => {
+                println!("Key up, keycode: {}", keycode);
+            }
+            Event::CharacterInput(char_code) => {
+                println!("Character input, char_code: {}", char_code);
+            }
+            Event::WindowResized(window_info) => {
+                println!("Window resized, {:?}", window_info);
+            }
+            Event::WindowFocus => {
+                println!("Window focused");
+            }
+            Event::WindowUnfocus => {
+                println!("Window unfocused");
+            }
+            Event::WillClose => {
+                println!("Window will close");
+            }
+        }
+    }
+
+    fn on_app_message(&mut self, _message: Self::AppMessage) {}
 }

src/event.rs

@@ -0,0 +1,46 @@
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+pub enum MouseButtonID {
+    Left,
+    Middle,
+    Right,
+    Back,
+    Forward,
+    Other(u8),
+}
+
+#[derive(Debug, Copy, Clone)]
+pub struct MouseScroll {
+    pub x_delta: f64,
+    pub y_delta: f64,
+}
+
+#[derive(Debug, Copy, Clone)]
+pub struct MouseClick {
+    pub id: MouseButtonID,
+    pub click_count: usize,
+    pub x: i32,
+    pub y: i32,
+}
+
+#[derive(Debug)]
+pub struct WindowInfo {
+    pub width: u32,
+    pub height: u32,
+    pub scale: f64,
+}
+
+#[derive(Debug)]
+pub enum Event {
+    CursorMotion(i32, i32), // new (x, y) relative to window
+    MouseDown(MouseButtonID),
+    MouseUp(MouseButtonID),
+    MouseScroll(MouseScroll),
+    MouseClick(MouseClick),
+    KeyDown(u8),               // keycode
+    KeyUp(u8),                 // keycode
+    CharacterInput(u32),       // character code
+    WindowResized(WindowInfo), // new (width, height)
+    WindowFocus,
+    WindowUnfocus,
+    WillClose,
+}

src/lib.rs

@@ -15,6 +15,9 @@ mod macos;
 #[cfg(target_os = "macos")]
 pub use macos::*;
 
+mod event;
+pub use event::*;
+
 pub enum Parent {
     None,
     AsIfParented,
@@ -29,3 +32,25 @@ pub struct WindowOpenOptions<'a> {
 
     pub parent: Parent,
 }
+
+pub trait AppWindow {
+    type AppMessage;
+
+    fn build(window_handle: RawWindow, window_info: &WindowInfo) -> Self;
+
+    fn draw(&mut self);
+    fn on_event(&mut self, event: Event);
+    fn on_app_message(&mut self, message: Self::AppMessage);
+}
+
+/// A wrapper for a `RawWindowHandle`. Some context creators expect an `&impl HasRawWindowHandle`.
+#[derive(Debug, Copy, Clone)]
+pub struct RawWindow {
+    pub raw_window_handle: raw_window_handle::RawWindowHandle,
+}
+
+unsafe impl raw_window_handle::HasRawWindowHandle for RawWindow {
+    fn raw_window_handle(&self) -> raw_window_handle::RawWindowHandle {
+        self.raw_window_handle
+    }
+}

src/macos/window.rs

@@ -6,12 +6,19 @@ use cocoa::appkit::{
 use cocoa::base::{nil, NO};
 use cocoa::foundation::{NSAutoreleasePool, NSPoint, NSRect, NSSize, NSString};
 
-use crate::WindowOpenOptions;
+use crate::{AppWindow, Event, MouseButtonID, MouseScroll, WindowOpenOptions};
 
-pub struct Window;
+pub struct Window<A: AppWindow> {
+    app_window: A,
+    app_message_rx: mpsc::Receiver<A::AppMessage>,
+}
 
-impl Window {
+impl<A: Application> Window<A> {
-    pub fn open(options: WindowOpenOptions) -> Self {
+    pub fn open(
+        options: WindowOpenOptions,
+        app_window: A,
+        app_message_rx: mpsc::Receiver<A::AppMessage>,
+    ) -> Self {
         unsafe {
             let _pool = NSAutoreleasePool::new(nil);
 
@@ -42,7 +49,10 @@ impl Window {
             current_app.activateWithOptions_(NSApplicationActivateIgnoringOtherApps);
             app.run();
 
-            Window
+            Window {
+                app_window,
+                app_message_rx,
+            }
         }
     }
 }

src/win/window.rs

@@ -2,6 +2,7 @@ extern crate winapi;
 
 use std::ffi::CString;
 use std::ptr::null_mut;
+use std::sync::mpsc;
 
 use self::winapi::shared::guiddef::GUID;
 use self::winapi::shared::minwindef::{ATOM, FALSE, LPARAM, LRESULT, UINT, WPARAM};
@@ -14,23 +15,24 @@ use self::winapi::um::wingdi::{
     PFD_TYPE_RGBA, PIXELFORMATDESCRIPTOR,
 };
 use self::winapi::um::winuser::{
-    AdjustWindowRectEx, CreateWindowExA, DefWindowProcA, DestroyWindow, DispatchMessageA, GetDC,
+    AdjustWindowRectEx, CreateWindowExA, DefWindowProcA, DestroyWindow, DispatchEventA, EventBoxA,
-    GetMessageA, GetWindowLongPtrA, MessageBoxA, PeekMessageA, PostMessageA, RegisterClassA,
+    GetDC, GetEventA, GetWindowLongPtrA, PeekEventA, PostEventA, RegisterClassA, ReleaseDC,
-    ReleaseDC, SetTimer, SetWindowLongPtrA, TranslateMessage, UnregisterClassA, CS_OWNDC,
+    SetTimer, SetWindowLongPtrA, TranslateEvent, UnregisterClassA, CS_OWNDC, GWLP_USERDATA,
-    GWLP_USERDATA, MB_ICONERROR, MB_OK, MB_TOPMOST, MSG, PM_REMOVE, WM_CREATE, WM_QUIT,
+    MB_ICONERROR, MB_OK, MB_TOPMOST, MSG, PM_REMOVE, WM_CREATE, WM_QUIT, WM_SHOWWINDOW, WM_TIMER,
-    WM_SHOWWINDOW, WM_TIMER, WNDCLASSA, WS_CAPTION, WS_CHILD, WS_CLIPSIBLINGS, WS_MAXIMIZEBOX,
+    WNDCLASSA, WS_CAPTION, WS_CHILD, WS_CLIPSIBLINGS, WS_MAXIMIZEBOX, WS_MINIMIZEBOX,
-    WS_MINIMIZEBOX, WS_POPUPWINDOW, WS_SIZEBOX, WS_VISIBLE,
+    WS_POPUPWINDOW, WS_SIZEBOX, WS_VISIBLE,
 };
 
 use self::winapi::ctypes::c_void;
 use crate::Parent::WithParent;
 use crate::{handle_message, WindowOpenOptions};
+use crate::{AppWindow, Event, MouseButtonID, MouseScroll};
 use std::sync::{Arc, Mutex};
 
 unsafe fn message_box(title: &str, msg: &str) {
     let title = (title.to_owned() + "\0").as_ptr() as *const i8;
     let msg = (msg.to_owned() + "\0").as_ptr() as *const i8;
-    MessageBoxA(null_mut(), msg, title, MB_ICONERROR | MB_OK | MB_TOPMOST);
+    EventBoxA(null_mut(), msg, title, MB_ICONERROR | MB_OK | MB_TOPMOST);
 }
 
 unsafe fn generate_guid() -> String {
@@ -61,7 +63,7 @@ unsafe extern "system" fn wnd_proc(
     let win_ptr = GetWindowLongPtrA(hwnd, GWLP_USERDATA) as *const c_void;
     match msg {
         WM_CREATE => {
-            PostMessageA(hwnd, WM_SHOWWINDOW, 0, 0);
+            PostEventA(hwnd, WM_SHOWWINDOW, 0, 0);
             0
         }
         _ => {
@@ -111,24 +113,34 @@ unsafe fn unregister_wnd_class(wnd_class: ATOM) {
 
 unsafe fn init_gl_context() {}
 
-pub struct Window {
+pub struct Window<A: AppWindow> {
     pub(crate) hwnd: HWND,
     hdc: HDC,
     gl_context: HGLRC,
     window_class: ATOM,
+    app_window: A,
+    app_message_rx: mpsc::Receiver<A::AppMessage>,
+    scaling: Option<f64>, // DPI scale, 96.0 is "default".
     r: f32,
     g: f32,
     b: f32,
 }
 
-impl Window {
+impl<A: AppWindow> Window<A> {
-    pub fn open(options: WindowOpenOptions) {
+    pub fn open(
+        options: WindowOpenOptions,
+        app_window: A,
+        app_message_rx: mpsc::Receiver<A::AppMessage>,
+    ) {
         unsafe {
             let mut window = Window {
                 hwnd: null_mut(),
                 hdc: null_mut(),
                 gl_context: null_mut(),
                 window_class: 0,
+                app_window,
+                app_message_rx,
+                scaling: None,
                 r: 0.3,
                 g: 0.8,
                 b: 0.3,
@@ -240,11 +252,11 @@ impl Window {
             if parent.is_null() {
                 let mut msg: MSG = std::mem::zeroed();
                 loop {
-                    let status = GetMessageA(&mut msg, hwnd, 0, 0);
+                    let status = GetEventA(&mut msg, hwnd, 0, 0);
                     if status == -1 {
                         break;
                     }
-                    TranslateMessage(&mut msg);
+                    TranslateEvent(&mut msg);
                     handle_message(Arc::clone(&win_p), msg.message, msg.wParam, msg.lParam);
                 }
             }
@@ -252,6 +264,8 @@ impl Window {
     }
 
     pub fn close(&self) {
+        self.app_window.on_event(Event::WillClose);
+
         // todo: see https://github.com/wrl/rutabaga/blob/f30ff67e157375cafdbafe5fb549f1790443a3a8/src/platform/win/window.c#L402
         unsafe {
             wglMakeCurrent(null_mut(), null_mut());
@@ -270,10 +284,11 @@ impl Window {
     }
 
     pub(crate) fn handle_mouse_motion(&mut self, x: i32, y: i32) {
-        println!("{}, {}", x, y);
         let r = (x as f32) / 1000.0;
         let g = (y as f32) / 1000.0;
         self.r = r;
         self.g = g;
+
+        self.app_window.on_message(Event::CursorMotion(x, y));
     }
 }

src/x11/mod.rs

@@ -1,7 +1,5 @@
-mod window;
-pub use window::*;
-
 mod xcb_connection;
 use xcb_connection::XcbConnection;
 
-mod opengl_util;
+mod window;
+pub use window::*;

src/x11/opengl_util.rs

@@ -1,66 +0,0 @@
-use std::ffi::CString;
-use std::os::raw::{c_int, c_void};
-
-use ::x11::{glx, xlib};
-
-use super::XcbConnection;
-
-pub type GlXCreateContextAttribsARBProc = unsafe extern "C" fn(
-    dpy: *mut xlib::Display,
-    fbc: glx::GLXFBConfig,
-    share_context: glx::GLXContext,
-    direct: xlib::Bool,
-    attribs: *const c_int,
-) -> glx::GLXContext;
-
-// Check to make sure this system supports the correct version of GLX (>= 1.3 for now)
-// For now it just panics if not, but TODO: do correct error handling
-pub fn check_glx_version(xcb_connection: &XcbConnection) {
-    let raw_display = xcb_connection.conn.get_raw_dpy();
-    let mut maj: c_int = 0;
-    let mut min: c_int = 0;
-
-    unsafe {
-        if glx::glXQueryVersion(raw_display, &mut maj as *mut c_int, &mut min as *mut c_int) == 0 {
-            panic!("Cannot get GLX version");
-        }
-        if (maj < 1) || (maj == 1 && min < 3) {
-            panic!("GLX version >= 1.3 required! (have {}.{})", maj, min);
-        }
-    }
-}
-
-// Get GLX framebuffer config
-// History: https://stackoverflow.com/questions/51558473/whats-the-difference-between-a-glx-visual-and-a-fbconfig
-pub fn get_glxfbconfig(xcb_connection: &XcbConnection, visual_attribs: &[i32]) -> glx::GLXFBConfig {
-    let raw_display = xcb_connection.conn.get_raw_dpy();
-    let xlib_display = xcb_connection.xlib_display;
-
-    unsafe {
-        let mut fbcount: c_int = 0;
-        let fbcs = glx::glXChooseFBConfig(
-            raw_display,
-            xlib_display,
-            visual_attribs.as_ptr(),
-            &mut fbcount as *mut c_int,
-        );
-
-        if fbcount == 0 {
-            panic!("Could not find compatible GLX FB config.");
-        }
-
-        // If we get more than one, any of the different configs work. Just choose the first one.
-        let fbc = *fbcs;
-        xlib::XFree(fbcs as *mut c_void);
-        fbc
-    }
-}
-
-pub unsafe fn load_gl_func(name: &str) -> *mut c_void {
-    let cname = CString::new(name).unwrap();
-    let ptr: *mut c_void = std::mem::transmute(glx::glXGetProcAddress(cname.as_ptr() as *const u8));
-    if ptr.is_null() {
-        panic!("could not load {}", name);
-    }
-    ptr
-}

src/x11/window.rs

@@ -1,29 +1,23 @@
-// TODO: messy for now, will refactor when I have more of an idea of the API/architecture
-// TODO: close window
-// TODO: proper error handling (no bare `unwrap`s, no panics)
-// TODO: move more OpenGL-related stuff into opengl_util.rs
-// TODO: consider researching all unsafe calls here and figuring out what invariants need to be upheld.
-//       (write safe wrappers?)
-
 use std::ffi::CStr;
-use std::os::raw::{c_int, c_void};
+use std::os::raw::{c_ulong, c_void};
-use std::ptr::null_mut;
+use std::sync::mpsc;
 
-use ::x11::{glx, xlib};
-// use xcb::dri2; // needed later
-
-use super::opengl_util;
 use super::XcbConnection;
-use crate::Parent;
+use crate::{
-use crate::WindowOpenOptions;
+    AppWindow, Event, MouseButtonID, MouseScroll, Parent, RawWindow, WindowInfo, WindowOpenOptions,
+};
 
-pub struct Window {
+use raw_window_handle::RawWindowHandle;
+
+pub struct Window<A: AppWindow> {
+    scaling: f64,
     xcb_connection: XcbConnection,
-    scaling: Option<f64>, // DPI scale, 96.0 is "default".
+    app_window: A,
+    app_message_rx: mpsc::Receiver<A::AppMessage>,
 }
 
-impl Window {
+impl<A: AppWindow> Window<A> {
-    pub fn open(options: WindowOpenOptions) -> Self {
+    pub fn open(options: WindowOpenOptions, app_message_rx: mpsc::Receiver<A::AppMessage>) -> Self {
         // Convert the parent to a X11 window ID if we're given one
         let parent = match options.parent {
             Parent::None => None,
@@ -34,49 +28,14 @@ impl Window {
         // Connect to the X server
         let xcb_connection = XcbConnection::new();
 
-        // Check GLX version (>= 1.3 needed)
-        opengl_util::check_glx_version(&xcb_connection);
-
-        // Get GLX framebuffer config (requires GLX >= 1.3)
-        #[rustfmt::skip]
-        let fb_config = opengl_util::get_glxfbconfig(
-            &xcb_connection,
-            &[
-                glx::GLX_X_RENDERABLE,  1,
-                glx::GLX_DRAWABLE_TYPE, glx::GLX_WINDOW_BIT,
-                glx::GLX_RENDER_TYPE,   glx::GLX_RGBA_BIT,
-                glx::GLX_X_VISUAL_TYPE, glx::GLX_TRUE_COLOR,
-                glx::GLX_RED_SIZE,      8,
-                glx::GLX_GREEN_SIZE,    8,
-                glx::GLX_BLUE_SIZE,     8,
-                glx::GLX_ALPHA_SIZE,    8,
-                glx::GLX_DEPTH_SIZE,    24,
-                glx::GLX_STENCIL_SIZE,  8,
-                glx::GLX_DOUBLEBUFFER,  1,
-                0
-            ],
-        );
-
-        // The GLX framebuffer config holds an XVisualInfo, which we'll need for other X operations.
-        let x_visual_info: *const xlib::XVisualInfo =
-            unsafe { glx::glXGetVisualFromFBConfig(xcb_connection.conn.get_raw_dpy(), fb_config) };
-
-        // Load up DRI2 extensions.
-        // See also: https://www.x.org/releases/X11R7.7/doc/dri2proto/dri2proto.txt
-        /*
-        // needed later when we handle events
-        let dri2_ev = {
-            xcb_connection.conn.prefetch_extension_data(dri2::id());
-            match xcb_connection.conn.get_extension_data(dri2::id()) {
-                None => panic!("could not load dri2 extension"),
-                Some(r) => r.first_event(),
-            }
-        };
-        */
-
         // Get screen information (?)
         let setup = xcb_connection.conn.get_setup();
-        let screen = unsafe { setup.roots().nth((*x_visual_info).screen as usize).unwrap() };
+        let screen = setup
+            .roots()
+            .nth(xcb_connection.xlib_display as usize)
+            .unwrap();
+
+        let foreground = xcb_connection.conn.generate_id();
 
         // Convert parent into something that X understands
         let parent_id = if let Some(p) = parent {
@@ -85,24 +44,30 @@ impl Window {
             screen.root()
         };
 
-        // Create a colormap
+        xcb::create_gc(
-        let colormap = xcb_connection.conn.generate_id();
-        unsafe {
-            xcb::create_colormap(
             &xcb_connection.conn,
-                xcb::COLORMAP_ALLOC_NONE as u8,
+            foreground,
-                colormap,
             parent_id,
-                (*x_visual_info).visualid as u32,
+            &[
+                (xcb::GC_FOREGROUND, screen.black_pixel()),
+                (xcb::GC_GRAPHICS_EXPOSURES, 0),
+            ],
         );
-        }
 
-        // Create window, connecting to the parent if we have one
         let window_id = xcb_connection.conn.generate_id();
-        let cw_values = [
+        xcb::create_window(
-            (xcb::CW_BACK_PIXEL, screen.white_pixel()),
+            &xcb_connection.conn,
-            (xcb::CW_BORDER_PIXEL, screen.black_pixel()),
+            xcb::COPY_FROM_PARENT as u8,
-            (
+            window_id,
+            parent_id,
+            0,                     // x coordinate of the new window
+            0,                     // y coordinate of the new window
+            options.width as u16,  // window width
+            options.height as u16, // window height
+            0,                     // window border
+            xcb::WINDOW_CLASS_INPUT_OUTPUT as u16,
+            screen.root_visual(),
+            &[(
                 xcb::CW_EVENT_MASK,
                 xcb::EVENT_MASK_EXPOSURE
                     | xcb::EVENT_MASK_POINTER_MOTION
@@ -110,40 +75,9 @@ impl Window {
                     | xcb::EVENT_MASK_BUTTON_RELEASE
                     | xcb::EVENT_MASK_KEY_PRESS
                     | xcb::EVENT_MASK_KEY_RELEASE,
-            ),
+            )],
-            (xcb::CW_COLORMAP, colormap),
-        ];
-        xcb::create_window(
-            // Connection
-            &xcb_connection.conn,
-            // Depth
-            unsafe { *x_visual_info }.depth as u8,
-            // Window ID
-            window_id,
-            // Parent ID
-            parent_id,
-            // x
-            0,
-            // y
-            0,
-            // width
-            options.width as u16,
-            // height
-            options.height as u16,
-            // border width
-            0,
-            // class
-            xcb::WINDOW_CLASS_INPUT_OUTPUT as u16,
-            // visual
-            unsafe { *x_visual_info }.visualid as u32,
-            // value list
-            &cw_values,
         );
-
+        xcb::map_window(&xcb_connection.conn, window_id);
-        // Don't need the visual info anymore
-        unsafe {
-            xlib::XFree(x_visual_info as *mut c_void);
-        }
 
         // Change window title
         let title = options.title;
@@ -153,103 +87,51 @@ impl Window {
             window_id,
             xcb::ATOM_WM_NAME,
             xcb::ATOM_STRING,
-            8,
+            8, // view data as 8-bit
             title.as_bytes(),
         );
 
-        // Load GLX extensions
-        // We need at least `GLX_ARB_create_context`
-        let glx_extensions = unsafe {
-            CStr::from_ptr(glx::glXQueryExtensionsString(
-                xcb_connection.conn.get_raw_dpy(),
-                xcb_connection.xlib_display,
-            ))
-            .to_str()
-            .unwrap()
-        };
-        glx_extensions
-            .find("GLX_ARB_create_context")
-            .expect("could not find GLX extension GLX_ARB_create_context");
-
-        // With GLX, we don't need a context pre-created in order to load symbols.
-        // Otherwise, we would need to create a temporary legacy (dummy) GL context to load them.
-        // (something that has at least GlXCreateContextAttribsARB)
-        let glx_create_context_attribs: opengl_util::GlXCreateContextAttribsARBProc =
-            unsafe { std::mem::transmute(opengl_util::load_gl_func("glXCreateContextAttribsARB")) };
-
-        // Load all other symbols
-        unsafe {
-            gl::load_with(|n| opengl_util::load_gl_func(&n));
-        }
-
-        // Check GL3 support
-        if !gl::GenVertexArrays::is_loaded() {
-            panic!("no GL3 support available!");
-        }
-
-        // TODO: This requires a global, which is a no. Figure out if there's a better way to do it.
-        /*
-        // installing an event handler to check if error is generated
-        unsafe {
-            ctx_error_occurred = false;
-        }
-        let old_handler = unsafe {
-            xlib::XSetErrorHandler(Some(ctx_error_handler))
-        };
-        */
-
-        // Create GLX context attributes. (?)
-        let context_attribs: [c_int; 5] = [
-            glx::arb::GLX_CONTEXT_MAJOR_VERSION_ARB as c_int,
-            3,
-            glx::arb::GLX_CONTEXT_MINOR_VERSION_ARB as c_int,
-            0,
-            0,
-        ];
-        let ctx = unsafe {
-            glx_create_context_attribs(
-                xcb_connection.conn.get_raw_dpy(),
-                fb_config,
-                null_mut(),
-                xlib::True,
-                &context_attribs[0] as *const c_int,
-            )
-        };
-
-        if ctx.is_null()
-        /* || ctx_error_occurred */
-        {
-            panic!("Error when creating a GL 3.0 context");
-        }
-        if unsafe { glx::glXIsDirect(xcb_connection.conn.get_raw_dpy(), ctx) } == 0 {
-            panic!("Obtained indirect rendering context");
-        }
-
-        // Display the window
-        xcb::map_window(&xcb_connection.conn, window_id);
         xcb_connection.conn.flush();
-        unsafe {
+
-            xlib::XSync(xcb_connection.conn.get_raw_dpy(), xlib::False);
+        let raw_handle = RawWindowHandle::Xlib(raw_window_handle::unix::XlibHandle {
-        }
+            window: window_id as c_ulong,
+            display: xcb_connection.conn.get_raw_dpy() as *mut c_void,
+            ..raw_window_handle::unix::XlibHandle::empty()
+        });
+
+        let raw_window = RawWindow {
+            raw_window_handle: raw_handle,
+        };
+
+        let scaling = get_scaling_xft(&xcb_connection)
+            .or(get_scaling_screen_dimensions(&xcb_connection))
+            .unwrap_or(1.0);
+
+        let window_info = WindowInfo {
+            width: options.width as u32,
+            height: options.height as u32,
+            scale: scaling,
+        };
+
+        let app_window = A::build(raw_window, &window_info);
 
         let mut x11_window = Self {
+            scaling,
             xcb_connection,
-            scaling: None,
+            app_window,
+            app_message_rx,
         };
 
-        x11_window.scaling = x11_window
+        x11_window.run_event_loop();
-            .get_scaling_xft()
-            .or(x11_window.get_scaling_screen_dimensions());
-        println!("Scale factor: {:?}", x11_window.scaling);
-        x11_window.handle_events(window_id, ctx);
 
-        return x11_window;
+        x11_window
     }
 
     // Event loop
-    fn handle_events(&self, window_id: u32, ctx: *mut x11::glx::__GLXcontextRec) {
+    fn run_event_loop(&mut self) {
-        let raw_display = self.xcb_connection.conn.get_raw_dpy();
         loop {
+            // somehow poll self.app_message_rx for messages at the same time
+
             let ev = self.xcb_connection.conn.wait_for_event();
             if let Some(event) = ev {
                 let event_type = event.response_type() & !0x80;
@@ -275,65 +157,63 @@ impl Window {
                 //   http://rtbo.github.io/rust-xcb/src/xcb/ffi/xproto.rs.html#445
 
                 match event_type {
-                    xcb::EXPOSE => unsafe {
+                    xcb::EXPOSE => {
-                        glx::glXMakeCurrent(raw_display, window_id as xlib::XID, ctx);
+                        self.app_window.draw();
-                        gl::ClearColor(0.3, 0.8, 0.3, 1.0);
+                    }
-                        gl::Clear(gl::COLOR_BUFFER_BIT);
-                        gl::Flush();
-                        glx::glXSwapBuffers(raw_display, window_id as xlib::XID);
-                        glx::glXMakeCurrent(raw_display, 0, null_mut());
-                    },
                     xcb::MOTION_NOTIFY => {
                         let event = unsafe { xcb::cast_event::<xcb::MotionNotifyEvent>(&event) };
-                        let x = event.event_x();
-                        let y = event.event_y();
                         let detail = event.detail();
-                        let state = event.state();
+
-                        println!("Mouse motion: ({}, {}) -- {} / {}", x, y, detail, state);
+                        if detail != 4 && detail != 5 {
+                            self.app_window.on_event(Event::CursorMotion(
+                                event.event_x() as i32,
+                                event.event_y() as i32,
+                            ));
+                        }
                     }
                     xcb::BUTTON_PRESS => {
                         let event = unsafe { xcb::cast_event::<xcb::ButtonPressEvent>(&event) };
-                        let x = event.event_x();
-                        let y = event.event_y();
                         let detail = event.detail();
-                        let state = event.state();
+
-                        println!(
+                        match detail {
-                            "Mouse button pressed: ({}, {}) -- {} / {}",
+                            4 => {
-                            x, y, detail, state
+                                self.app_window.on_event(Event::MouseScroll(MouseScroll {
-                        );
+                                    x_delta: 0.0,
+                                    y_delta: 1.0,
+                                }));
+                            }
+                            5 => {
+                                self.app_window.on_event(Event::MouseScroll(MouseScroll {
+                                    x_delta: 0.0,
+                                    y_delta: -1.0,
+                                }));
+                            }
+                            detail => {
+                                let button_id = mouse_id(detail);
+                                self.app_window.on_event(Event::MouseDown(button_id));
+                            }
+                        }
                     }
                     xcb::BUTTON_RELEASE => {
-                        let event = unsafe { xcb::cast_event::<xcb::ButtonReleaseEvent>(&event) };
+                        let event = unsafe { xcb::cast_event::<xcb::ButtonPressEvent>(&event) };
-                        let x = event.event_x();
-                        let y = event.event_y();
                         let detail = event.detail();
-                        let state = event.state();
+
-                        println!(
+                        if detail != 4 && detail != 5 {
-                            "Mouse button released: ({}, {}) -- {} / {}",
+                            let button_id = mouse_id(detail);
-                            x, y, detail, state
+                            self.app_window.on_event(Event::MouseUp(button_id));
-                        );
+                        }
                     }
                     xcb::KEY_PRESS => {
                         let event = unsafe { xcb::cast_event::<xcb::KeyPressEvent>(&event) };
-                        let x = event.event_x();
-                        let y = event.event_y();
                         let detail = event.detail();
-                        let state = event.state();
+
-                        println!(
+                        self.app_window.on_event(Event::KeyDown(detail));
-                            "Keyboard key pressed: ({}, {}) -- {} / {}",
-                            x, y, detail, state
-                        );
                     }
                     xcb::KEY_RELEASE => {
                         let event = unsafe { xcb::cast_event::<xcb::KeyReleaseEvent>(&event) };
-                        let x = event.event_x();
-                        let y = event.event_y();
                         let detail = event.detail();
-                        let state = event.state();
+
-                        println!(
+                        self.app_window.on_event(Event::KeyUp(detail));
-                            "Keyboard key released: ({}, {}) -- {} / {}",
-                            x, y, detail, state
-                        );
                     }
                     _ => {
                         println!("Unhandled event type: {:?}", event_type);
@@ -342,18 +222,18 @@ impl Window {
             }
         }
     }
+}
 
-    // Try to get the scaling with this function first.
+// Try to get the scaling with this function first.
-    // If this gives you `None`, fall back to `get_scaling_screen_dimensions`.
+// If this gives you `None`, fall back to `get_scaling_screen_dimensions`.
-    // If neither work, I guess just assume 96.0 and don't do any scaling.
+// If neither work, I guess just assume 96.0 and don't do any scaling.
-    fn get_scaling_xft(&self) -> Option<f64> {
+fn get_scaling_xft(xcb_connection: &XcbConnection) -> Option<f64> {
     use std::ffi::CString;
     use x11::xlib::{
-            XResourceManagerString, XrmDestroyDatabase, XrmGetResource, XrmGetStringDatabase,
+        XResourceManagerString, XrmDestroyDatabase, XrmGetResource, XrmGetStringDatabase, XrmValue,
-            XrmValue,
     };
 
-        let display = self.xcb_connection.conn.get_raw_dpy();
+    let display = xcb_connection.conn.get_raw_dpy();
     unsafe {
         let rms = XResourceManagerString(display);
         if !rms.is_null() {
@@ -380,8 +260,9 @@ impl Window {
                     let value_addr: &CStr = CStr::from_ptr(value.addr);
                     value_addr.to_str().ok();
                     let value_str = value_addr.to_str().ok()?;
-                        let value_f64 = value_str.parse().ok()?;
+                    let value_f64: f64 = value_str.parse().ok()?;
-                        Some(value_f64)
+                    let dpi_to_scale = value_f64 / 96.0;
+                    Some(dpi_to_scale)
                 } else {
                     None
                 };
@@ -392,17 +273,17 @@ impl Window {
         }
     }
     None
-    }
+}
 
-    // Try to get the scaling with `get_scaling_xft` first.
+// Try to get the scaling with `get_scaling_xft` first.
-    // Only use this function as a fallback.
+// Only use this function as a fallback.
-    // If neither work, I guess just assume 96.0 and don't do any scaling.
+// If neither work, I guess just assume 96.0 and don't do any scaling.
-    fn get_scaling_screen_dimensions(&self) -> Option<f64> {
+fn get_scaling_screen_dimensions(xcb_connection: &XcbConnection) -> Option<f64> {
     // Figure out screen information
-        let setup = self.xcb_connection.conn.get_setup();
+    let setup = xcb_connection.conn.get_setup();
     let screen = setup
         .roots()
-            .nth(self.xcb_connection.xlib_display as usize)
+        .nth(xcb_connection.xlib_display as usize)
         .unwrap();
 
     // Get the DPI from the screen struct
@@ -418,7 +299,19 @@ impl Window {
     let _xres = width_px * 25.4 / width_mm;
     let yres = height_px * 25.4 / height_mm;
 
+    let yscale = yres / 96.0;
+
     // TODO: choose between `xres` and `yres`? (probably both are the same?)
-        Some(yres)
+    Some(yscale)
+}
+
+fn mouse_id(id: u8) -> MouseButtonID {
+    match id {
+        1 => MouseButtonID::Left,
+        2 => MouseButtonID::Middle,
+        3 => MouseButtonID::Right,
+        6 => MouseButtonID::Back,
+        7 => MouseButtonID::Forward,
+        id => MouseButtonID::Other(id),
     }
 }