Merge pull request #477 from rozaliev/feature/ios

[WIP] ios support

1 files changed, 420 insertions, 0 deletions

diff --git a/src/api/ios/mod.rs b/src/api/ios/mod.rs
new file mode 100644
index 0000000..9d1b527
--- /dev/null
+++ b/src/api/ios/mod.rs
@@ -0,0 +1,420 @@
+//! iOS support
+//!
+//! # Building app
+//! To build ios app you will need rustc built for this targets:
+//!
+//!  - armv7-apple-ios
+//!  - armv7s-apple-ios
+//!  - i386-apple-ios
+//!  - aarch64-apple-ios
+//!  - x86_64-apple-ios
+//!
+//! Then
+//!
+//! ```
+//! cargo build --target=...
+//! ```
+//! The simplest way to integrate your app into xcode environment is to build it
+//! as a static library. Wrap your main function and export it.
+//!
+//! ```rust, ignore
+//! #[no_mangle]
+//! pub extern fn start_glutin_app() {
+//!     start_inner()
+//! }
+//!
+//! fn start_inner() {
+//!    ...
+//! }
+//!
+//! ```
+//!
+//! Compile project and then drag resulting .a into Xcode project. Add glutin.h to xcode.
+//!
+//! ```c
+//! void start_glutin_app();
+//! ```
+//!
+//! Use start_glutin_app inside your xcode's main function.
+//!
+//!
+//! # App lifecycle and events
+//!
+//! iOS environment is very different from other platforms and you must be very
+//! careful with it's events. Familiarize yourself with [app lifecycle](https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIApplicationDelegate_Protocol/).
+//!
+//!
+//! This is how those event are represented in glutin:
+//!
+//!  - applicationDidBecomeActive is Focused(true)
+//!  - applicationWillResignActive is Focused(false)
+//!  - applicationDidEnterBackground is Suspended(true)
+//!  - applicationWillEnterForeground is Suspended(false)
+//!  - applicationWillTerminate is Closed
+//!
+//! Keep in mind that after Closed event is received every attempt to draw with opengl will result in segfault.
+//!
+//! Also note that app will not receive Closed event if suspended, it will be SIGKILL'ed
+
+
+
+
+#![cfg(target_os = "ios")]
+#![deny(warnings)]
+
+use std::collections::VecDeque;
+use std::ptr;
+use std::mem;
+use std::ffi::CString;
+
+use libc;
+use objc::runtime::{Class, BOOL, YES, NO };
+
+use native_monitor::NativeMonitorId;
+use { Api, PixelFormat, CreationError, BuilderAttribs, GlContext, CursorState, MouseCursor, Event };
+use CreationError::OsError;
+
+mod delegate;
+use self::delegate::{ create_delegate_class, create_view_class };
+
+mod ffi;
+use self::ffi::{
+    gles,
+    setjmp,
+    dlopen,
+    dlsym,
+    UIApplicationMain,
+    kEAGLColorFormatRGB565,
+    CFTimeInterval,
+    CFRunLoopRunInMode,
+    kCFRunLoopDefaultMode,
+    kCFRunLoopRunHandledSource,
+    kEAGLDrawablePropertyRetainedBacking,
+    kEAGLDrawablePropertyColorFormat,
+    RTLD_LAZY,
+    RTLD_GLOBAL,
+    id,
+    nil,
+    NSString,
+    CGFloat
+ };
+
+
+static mut jmpbuf: [libc::c_int;27] = [0;27];
+
+pub struct MonitorID;
+
+pub struct Window {
+    eagl_context: id,
+    delegate_state: *mut DelegateState
+}
+
+#[derive(Clone)]
+pub struct WindowProxy;
+
+pub struct PollEventsIterator<'a> {
+    window: &'a Window,
+}
+
+pub struct WaitEventsIterator<'a> {
+    window: &'a Window,
+}
+
+#[derive(Debug)]
+struct DelegateState {
+    events_queue: VecDeque<Event>,
+    window: id,
+    controller: id,
+    view: id,
+    size: (u32,u32),
+    scale: f32
+}
+
+
+impl DelegateState {
+    fn new(window: id, controller:id, view: id, size: (u32,u32), scale: f32) -> DelegateState {
+        DelegateState {
+            events_queue: VecDeque::new(),
+            window: window,
+            controller: controller,
+            view: view,
+            size: size,
+            scale: scale
+        }
+    }
+}
+
+
+pub fn get_available_monitors() -> VecDeque<MonitorID> {
+    let mut rb = VecDeque::new();
+    rb.push_back(MonitorID);
+    rb
+}
+
+pub fn get_primary_monitor() -> MonitorID {
+    MonitorID
+}
+
+impl MonitorID {
+    pub fn get_name(&self) -> Option<String> {
+        Some("Primary".to_string())
+    }
+
+    pub fn get_native_identifier(&self) -> NativeMonitorId {
+        NativeMonitorId::Unavailable
+    }
+
+    pub fn get_dimensions(&self) -> (u32, u32) {
+        unimplemented!()
+    }
+}
+
+
+impl Window {
+
+    pub fn new(builder: BuilderAttribs) -> Result<Window, CreationError> {
+        unsafe {
+            if setjmp(mem::transmute(&mut jmpbuf)) != 0 {
+                let app: id = msg_send![Class::get("UIApplication").unwrap(), sharedApplication];
+                let delegate: id = msg_send![app, delegate];
+                let state: *mut libc::c_void = *(&*delegate).get_ivar("glutinState");
+                let state = state as *mut DelegateState;
+
+                let context = Window::create_context();
+
+                let mut window = Window {
+                    eagl_context: context,
+                    delegate_state: state
+                };
+
+                window.init_context(builder);
+
+                return Ok(window)
+            }
+        }
+
+        create_delegate_class();
+        create_view_class();
+        Window::start_app();
+
+        Err(CreationError::OsError(format!("Couldn't create UIApplication")))
+    }
+
+    unsafe fn init_context(&mut self, builder: BuilderAttribs) {
+        let draw_props: id = msg_send![Class::get("NSDictionary").unwrap(), alloc];
+            let draw_props: id = msg_send![draw_props,
+                    initWithObjects:
+                        vec![
+                            msg_send![Class::get("NSNumber").unwrap(), numberWithBool: NO],
+                            kEAGLColorFormatRGB565
+                        ].as_ptr()
+                    forKeys:
+                        vec![
+                            kEAGLDrawablePropertyRetainedBacking,
+                            kEAGLDrawablePropertyColorFormat
+                        ].as_ptr()
+                    count: 2
+            ];
+        self.make_current();
+
+        let state = &mut *self.delegate_state;
+
+        if builder.multitouch {
+            let _: () = msg_send![state.view, setMultipleTouchEnabled:YES];
+        }
+
+        let _: () = msg_send![state.view, setContentScaleFactor:state.scale as CGFloat];
+
+        let layer: id = msg_send![state.view, layer];
+        let _: () = msg_send![layer, setContentsScale:state.scale as CGFloat];
+        let _: () = msg_send![layer, setDrawableProperties: draw_props];
+
+        let gl = gles::Gles2::load_with(|symbol| self.get_proc_address(symbol));
+        let mut color_render_buf: gles::types::GLuint = 0;
+        let mut frame_buf: gles::types::GLuint = 0;
+        gl.GenRenderbuffers(1, &mut color_render_buf);
+        gl.BindRenderbuffer(gles::RENDERBUFFER, color_render_buf);
+
+        let ok: BOOL = msg_send![self.eagl_context, renderbufferStorage:gles::RENDERBUFFER fromDrawable:layer];
+        if ok != YES {
+            panic!("EAGL: could not set renderbufferStorage");
+        }
+
+        gl.GenFramebuffers(1, &mut frame_buf);
+        gl.BindFramebuffer(gles::FRAMEBUFFER, frame_buf);
+
+        gl.FramebufferRenderbuffer(gles::FRAMEBUFFER, gles::COLOR_ATTACHMENT0, gles::RENDERBUFFER, color_render_buf);
+
+        let status = gl.CheckFramebufferStatus(gles::FRAMEBUFFER);
+        if gl.CheckFramebufferStatus(gles::FRAMEBUFFER) != gles::FRAMEBUFFER_COMPLETE {
+            panic!("framebuffer status: {:?}", status);
+        }
+    }
+
+    fn create_context() -> id {
+        unsafe {
+            let eagl_context: id = msg_send![Class::get("EAGLContext").unwrap(), alloc];
+            let eagl_context: id = msg_send![eagl_context, initWithAPI:2]; // es2
+            eagl_context
+        }
+    }
+
+    fn start_app() {
+        unsafe {
+            UIApplicationMain(0, ptr::null(), nil, NSString::alloc(nil).init_str("AppDelegate"));
+        }
+    }
+
+    pub fn is_closed(&self) -> bool {
+        false
+    }
+
+    pub fn set_title(&self, _: &str) {
+    }
+
+    pub fn show(&self) {
+    }
+
+    pub fn hide(&self) {
+    }
+
+    pub fn get_position(&self) -> Option<(i32, i32)> {
+        None
+    }
+
+    pub fn set_position(&self, _x: i32, _y: i32) {
+    }
+
+    pub fn get_inner_size(&self) -> Option<(u32, u32)> {
+        unsafe { Some((&*self.delegate_state).size) }
+    }
+
+    pub fn get_outer_size(&self) -> Option<(u32, u32)> {
+        self.get_inner_size()
+    }
+
+    pub fn set_inner_size(&self, _x: u32, _y: u32) {
+    }
+
+    pub fn poll_events(&self) -> PollEventsIterator {
+        PollEventsIterator {
+            window: self
+        }
+    }
+
+    pub fn wait_events(&self) -> WaitEventsIterator {
+        WaitEventsIterator {
+            window: self
+        }
+    }
+
+    pub fn platform_display(&self) -> *mut libc::c_void {
+        unimplemented!();
+    }
+
+    pub fn platform_window(&self) -> *mut libc::c_void {
+        unimplemented!()
+    }
+
+    pub fn get_pixel_format(&self) -> PixelFormat {
+        unimplemented!();
+    }
+
+    pub fn set_window_resize_callback(&mut self, _: Option<fn(u32, u32)>) {
+    }
+
+    pub fn set_cursor(&self, _: MouseCursor) {
+    }
+
+    pub fn set_cursor_state(&self, _: CursorState) -> Result<(), String> {
+        Ok(())
+    }
+
+    pub fn hidpi_factor(&self) -> f32 {
+        unsafe { (&*self.delegate_state) }.scale
+    }
+
+    pub fn set_cursor_position(&self, _x: i32, _y: i32) -> Result<(), ()> {
+        unimplemented!();
+    }
+
+    pub fn create_window_proxy(&self) -> WindowProxy {
+        WindowProxy
+    }
+
+}
+
+impl GlContext for Window {
+    unsafe fn make_current(&self) {
+        let _:BOOL = msg_send![Class::get("EAGLContext").unwrap(), setCurrentContext: self.eagl_context];
+    }
+
+    fn is_current(&self) -> bool {
+        false
+    }
+
+    fn get_proc_address(&self, addr: &str) -> *const libc::c_void {
+        let addr_c = CString::new(addr).unwrap();
+        let path = CString::new("/System/Library/Frameworks/OpenGLES.framework/OpenGLES").unwrap();
+        unsafe {
+            let lib = dlopen(path.as_ptr(), RTLD_LAZY | RTLD_GLOBAL);
+            dlsym(lib, addr_c.as_ptr())
+        }
+    }
+
+    fn swap_buffers(&self) {
+        unsafe { let _:BOOL = msg_send![self.eagl_context, presentRenderbuffer: gles::RENDERBUFFER]; }
+    }
+
+    fn get_api(&self) -> Api {
+        unimplemented!()
+    }
+
+    fn get_pixel_format(&self) -> PixelFormat {
+        unimplemented!()
+    }
+}
+
+impl WindowProxy {
+    pub fn wakeup_event_loop(&self) {
+        unimplemented!()
+    }
+}
+
+
+impl<'a> Iterator for WaitEventsIterator<'a> {
+    type Item = Event;
+
+    fn next(&mut self) -> Option<Event> {
+        loop {
+            if let Some(ev) = self.window.poll_events().next() {
+                return Some(ev);
+            }
+        }
+    }
+}
+
+impl<'a> Iterator for PollEventsIterator<'a> {
+    type Item = Event;
+
+    fn next(&mut self) -> Option<Event> {
+        unsafe {
+            let state = &mut *self.window.delegate_state;
+
+            if let Some(event) = state.events_queue.pop_front() {
+                return Some(event)
+            }
+
+            // jump hack, so we won't quit on willTerminate event before processing it
+            if setjmp(mem::transmute(&mut jmpbuf)) != 0 {
+                return state.events_queue.pop_front()
+            }
+
+            // run runloop
+            let seconds: CFTimeInterval = 0.000002;
+            while CFRunLoopRunInMode(kCFRunLoopDefaultMode, seconds, 1) == kCFRunLoopRunHandledSource {}
+
+            state.events_queue.pop_front()
+        }
+    }
+}