Split GLX and X11 in "api"

3 files changed, 239 insertions, 119 deletions

diff --git a/src/api/glx/mod.rs b/src/api/glx/mod.rs
new file mode 100644
index 0000000..fb86dfd
--- /dev/null
+++ b/src/api/glx/mod.rs
@@ -0,0 +1,187 @@
+#![cfg(all(target_os = "linux", feature = "window"))]
+
+use BuilderAttribs;
+use CreationError;
+use GlRequest;
+use Api;
+
+use libc;
+use std::ffi::CString;
+use std::{mem, ptr};
+
+use api::x11::ffi;
+
+pub struct Context {
+    display: *mut ffi::Display,
+    window: ffi::Window,
+    context: ffi::GLXContext,
+}
+
+// TODO: remove me
+fn with_c_str<F, T>(s: &str, f: F) -> T where F: FnOnce(*const libc::c_char) -> T {
+    use std::ffi::CString;
+    let c_str = CString::new(s.as_bytes().to_vec()).unwrap();
+    f(c_str.as_ptr())
+}
+
+impl Context {
+    pub fn new(builder: BuilderAttribs, display: *mut ffi::Display, window: ffi::Window,
+               fb_config: ffi::glx::types::GLXFBConfig, mut visual_infos: ffi::glx::types::XVisualInfo)
+               -> Result<Context, CreationError>
+    {
+        // creating GL context
+        let (context, extra_functions) = unsafe {
+            let mut attributes = Vec::new();
+
+            match builder.gl_version {
+                GlRequest::Latest => {},
+                GlRequest::Specific(Api::OpenGl, (major, minor)) => {
+                    attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
+                    attributes.push(major as libc::c_int);
+                    attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
+                    attributes.push(minor as libc::c_int);
+                },
+                GlRequest::Specific(_, _) => panic!("Only OpenGL is supported"),
+                GlRequest::GlThenGles { opengl_version: (major, minor), .. } => {
+                    attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
+                    attributes.push(major as libc::c_int);
+                    attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
+                    attributes.push(minor as libc::c_int);
+                },
+            }
+
+            if builder.gl_debug {
+                attributes.push(ffi::glx_extra::CONTEXT_FLAGS_ARB as libc::c_int);
+                attributes.push(ffi::glx_extra::CONTEXT_DEBUG_BIT_ARB as libc::c_int);
+            }
+
+            attributes.push(0);
+
+            // loading the extra GLX functions
+            let extra_functions = ffi::glx_extra::Glx::load_with(|addr| {
+                with_c_str(addr, |s| {
+                    ffi::glx::GetProcAddress(s as *const u8) as *const libc::c_void
+                })
+            });
+
+            let share = if let Some(win) = builder.sharing {
+                match win.x.context {
+                    ::api::x11::Context::Glx(ref c) => c.context,
+                    _ => panic!("Cannot share contexts between different APIs")
+                }
+            } else {
+                ptr::null()
+            };
+
+            let mut context = if extra_functions.CreateContextAttribsARB.is_loaded() {
+                extra_functions.CreateContextAttribsARB(display as *mut ffi::glx_extra::types::Display,
+                    fb_config, share, 1, attributes.as_ptr())
+            } else {
+                ptr::null()
+            };
+
+            if context.is_null() {
+                context = ffi::glx::CreateContext(display as *mut _, &mut visual_infos, share, 1)
+            }
+
+            if context.is_null() {
+                return Err(CreationError::OsError(format!("GL context creation failed")));
+            }
+
+            (context, extra_functions)
+        };
+
+        // vsync
+        if builder.vsync {
+            unsafe { ffi::glx::MakeCurrent(display as *mut _, window, context) };
+
+            if extra_functions.SwapIntervalEXT.is_loaded() {
+                // this should be the most common extension
+                unsafe {
+                    extra_functions.SwapIntervalEXT(display as *mut _, window, 1);
+                }
+
+                // checking that it worked
+                if builder.strict {
+                    let mut swap = unsafe { mem::uninitialized() };
+                    unsafe {
+                        ffi::glx::QueryDrawable(display as *mut _, window,
+                                                ffi::glx_extra::SWAP_INTERVAL_EXT as i32,
+                                                &mut swap);
+                    }
+
+                    if swap != 1 {
+                        return Err(CreationError::OsError(format!("Couldn't setup vsync: expected \
+                                                    interval `1` but got `{}`", swap)));
+                    }
+                }
+
+            // GLX_MESA_swap_control is not official
+            /*} else if extra_functions.SwapIntervalMESA.is_loaded() {
+                unsafe {
+                    extra_functions.SwapIntervalMESA(1);
+                }*/
+
+            } else if extra_functions.SwapIntervalSGI.is_loaded() {
+                unsafe {
+                    extra_functions.SwapIntervalSGI(1);
+                }
+
+            } else if builder.strict {
+                return Err(CreationError::OsError(format!("Couldn't find any available vsync extension")));
+            }
+
+            unsafe { ffi::glx::MakeCurrent(display as *mut _, 0, ptr::null()) };
+        }
+
+        Ok(Context {
+            display: display,
+            window: window,
+            context: context,
+        })
+    }
+
+    pub fn make_current(&self) {
+        let res = unsafe { ffi::glx::MakeCurrent(self.display as *mut _, self.window, self.context) };
+        if res == 0 {
+            panic!("glx::MakeCurrent failed");
+        }
+    }
+
+    pub fn is_current(&self) -> bool {
+        unsafe { ffi::glx::GetCurrentContext() == self.context }
+    }
+
+    pub fn get_proc_address(&self, addr: &str) -> *const () {
+        let addr = CString::new(addr.as_bytes()).unwrap();
+        let addr = addr.as_ptr();
+        unsafe {
+            ffi::glx::GetProcAddress(addr as *const _) as *const ()
+        }
+    }
+
+    pub fn swap_buffers(&self) {
+        unsafe {
+            ffi::glx::SwapBuffers(self.display as *mut _, self.window)
+        }
+    }
+
+    pub fn get_api(&self) -> ::Api {
+        ::Api::OpenGl
+    }
+}
+
+unsafe impl Send for Context {}
+unsafe impl Sync for Context {}
+
+impl Drop for Context {
+    fn drop(&mut self) {
+        use std::ptr;
+
+        unsafe {
+            // we don't call MakeCurrent(0, 0) because we are not sure that the context
+            // is still the current one
+            ffi::glx::DestroyContext(self.display as *mut _, self.context);
+        }
+    }
+}
diff --git a/src/api/mod.rs b/src/api/mod.rs
index a99cef7..c71c239 100644
--- a/src/api/mod.rs
+++ b/src/api/mod.rs
@@ -1,6 +1,7 @@
 pub mod android;
 pub mod cocoa;
 pub mod egl;
+pub mod glx;
 pub mod osmesa;
 pub mod win32;
 pub mod x11;
diff --git a/src/api/x11/mod.rs b/src/api/x11/mod.rs
index c4c5a76..0bb5c88 100644
--- a/src/api/x11/mod.rs
+++ b/src/api/x11/mod.rs
@@ -15,11 +15,13 @@ use CursorState;
 use GlRequest;
 use PixelFormat;
 
+use api::glx::Context as GlxContext;
+
 pub use self::monitor::{MonitorID, get_available_monitors, get_primary_monitor};
 
 mod events;
-mod ffi;
 mod monitor;
+pub mod ffi;
 
 static THREAD_INIT: Once = ONCE_INIT;
 
@@ -42,16 +44,17 @@ fn ensure_thread_init() {
     });
 }
 
+// TODO: remove me
 fn with_c_str<F, T>(s: &str, f: F) -> T where F: FnOnce(*const libc::c_char) -> T {
     use std::ffi::CString;
     let c_str = CString::new(s.as_bytes().to_vec()).unwrap();
     f(c_str.as_ptr())
 }
 
-struct XWindow {
+pub struct XWindow {
     display: *mut ffi::Display,
     window: ffi::Window,
-    context: ffi::GLXContext,
+    pub context: Context,
     is_fullscreen: bool,
     screen_id: libc::c_int,
     xf86_desk_mode: *mut ffi::XF86VidModeModeInfo,
@@ -59,6 +62,11 @@ struct XWindow {
     im: ffi::XIM,
 }
 
+pub enum Context {
+    Glx(GlxContext),
+    None,
+}
+
 unsafe impl Send for XWindow {}
 unsafe impl Sync for XWindow {}
 
@@ -70,7 +78,7 @@ impl Drop for XWindow {
         unsafe {
             // we don't call MakeCurrent(0, 0) because we are not sure that the context
             // is still the current one
-            ffi::glx::DestroyContext(self.display as *mut _, self.context);
+            self.context = Context::None;
 
             if self.is_fullscreen {
                 ffi::XF86VidModeSwitchToMode(self.display, self.screen_id, self.xf86_desk_mode);
@@ -282,7 +290,7 @@ impl<'a> Iterator for WaitEventsIterator<'a> {
 }
 
 pub struct Window {
-    x: Arc<XWindow>,
+    pub x: Arc<XWindow>,
     is_closed: AtomicBool,
     wm_delete_window: ffi::Atom,
     current_size: Cell<(libc::c_int, libc::c_int)>,
@@ -528,109 +536,22 @@ impl Window {
             });
         }
 
-        // creating GL context
-        let (context, extra_functions) = unsafe {
-            let mut attributes = Vec::new();
-
-            match builder.gl_version {
-                GlRequest::Latest => {},
-                GlRequest::Specific(Api::OpenGl, (major, minor)) => {
-                    attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
-                    attributes.push(major as libc::c_int);
-                    attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
-                    attributes.push(minor as libc::c_int);
-                },
-                GlRequest::Specific(_, _) => panic!("Only OpenGL is supported"),
-                GlRequest::GlThenGles { opengl_version: (major, minor), .. } => {
-                    attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
-                    attributes.push(major as libc::c_int);
-                    attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
-                    attributes.push(minor as libc::c_int);
-                },
-            }
-
-            if builder.gl_debug {
-                attributes.push(ffi::glx_extra::CONTEXT_FLAGS_ARB as libc::c_int);
-                attributes.push(ffi::glx_extra::CONTEXT_DEBUG_BIT_ARB as libc::c_int);
-            }
-
-            attributes.push(0);
-
-            // loading the extra GLX functions
-            let extra_functions = ffi::glx_extra::Glx::load_with(|addr| {
-                with_c_str(addr, |s| {
-                    use libc;
-                    ffi::glx::GetProcAddress(s as *const u8) as *const libc::c_void
-                })
-            });
-
-            let share = if let Some(win) = builder.sharing {
-                win.x.context
-            } else {
-                ptr::null()
-            };
-
-            let mut context = if extra_functions.CreateContextAttribsARB.is_loaded() {
-                extra_functions.CreateContextAttribsARB(display as *mut ffi::glx_extra::types::Display,
-                    fb_config, share, 1, attributes.as_ptr())
-            } else {
-                ptr::null()
-            };
-
-            if context.is_null() {
-                context = ffi::glx::CreateContext(display as *mut _, &mut visual_infos, share, 1)
-            }
-
-            if context.is_null() {
-                return Err(OsError(format!("GL context creation failed")));
-            }
-
-            (context, extra_functions)
+        let is_fullscreen = builder.monitor.is_some();
+        // creating the context
+        let context = match builder.gl_version {
+            GlRequest::Latest | GlRequest::Specific(Api::OpenGl, _) | GlRequest::GlThenGles { .. } => {
+                Context::Glx(try!(GlxContext::new(builder, display, window,
+                                                  fb_config, visual_infos)))
+            },
+            /*GlRequest::Specific(Api::OpenGlEs, _) => {
+                let egl = ::egl::ffi::egl::Egl;
+                Context::Egl(try!(EglContext::new(egl, builder, Some(display as *const _), window)))
+            },*/
+            GlRequest::Specific(_, _) => {
+                return Err(CreationError::NotSupported);
+            },
         };
 
-        // vsync
-        if builder.vsync {
-            unsafe { ffi::glx::MakeCurrent(display as *mut _, window, context) };
-
-            if extra_functions.SwapIntervalEXT.is_loaded() {
-                // this should be the most common extension
-                unsafe {
-                    extra_functions.SwapIntervalEXT(display as *mut _, window, 1);
-                }
-
-                // checking that it worked
-                if builder.strict {
-                    let mut swap = unsafe { mem::uninitialized() };
-                    unsafe {
-                        ffi::glx::QueryDrawable(display as *mut _, window,
-                                                ffi::glx_extra::SWAP_INTERVAL_EXT as i32,
-                                                &mut swap);
-                    }
-
-                    if swap != 1 {
-                        return Err(OsError(format!("Couldn't setup vsync: expected \
-                                                    interval `1` but got `{}`", swap)));
-                    }
-                }
-
-            // GLX_MESA_swap_control is not official
-            /*} else if extra_functions.SwapIntervalMESA.is_loaded() {
-                unsafe {
-                    extra_functions.SwapIntervalMESA(1);
-                }*/
-
-            } else if extra_functions.SwapIntervalSGI.is_loaded() {
-                unsafe {
-                    extra_functions.SwapIntervalSGI(1);
-                }
-
-            } else if builder.strict {
-                return Err(OsError(format!("Couldn't find any available vsync extension")));
-            }
-
-            unsafe { ffi::glx::MakeCurrent(display as *mut _, 0, ptr::null()) };
-        }
-
         // creating the window object
         let window = Window {
             x: Arc::new(XWindow {
@@ -640,7 +561,7 @@ impl Window {
                 ic: ic,
                 context: context,
                 screen_id: screen_id,
-                is_fullscreen: builder.monitor.is_some(),
+                is_fullscreen: is_fullscreen,
                 xf86_desk_mode: xf86_desk_mode,
             }),
             is_closed: AtomicBool::new(false),
@@ -743,28 +664,35 @@ impl Window {
     }
 
     pub unsafe fn make_current(&self) {
-        let res = ffi::glx::MakeCurrent(self.x.display as *mut _, self.x.window, self.x.context);
-        if res == 0 {
-            panic!("glx::MakeCurrent failed");
+        match self.x.context {
+            Context::Glx(ref ctxt) => ctxt.make_current(),
+            //Context::Egl(ref ctxt) => ctxt.make_current(),
+            Context::None => {}
         }
     }
 
     pub fn is_current(&self) -> bool {
-        unsafe { ffi::glx::GetCurrentContext() == self.x.context }
+        match self.x.context {
+            Context::Glx(ref ctxt) => ctxt.is_current(),
+            //Context::Egl(ref ctxt) => ctxt.is_current(),
+            Context::None => panic!()
+        }
     }
 
     pub fn get_proc_address(&self, addr: &str) -> *const () {
-        use std::mem;
-
-        unsafe {
-            with_c_str(addr, |s| {
-                ffi::glx::GetProcAddress(mem::transmute(s)) as *const ()
-            })
+        match self.x.context {
+            Context::Glx(ref ctxt) => ctxt.get_proc_address(addr),
+            //Context::Egl(ref ctxt) => ctxt.get_proc_address(addr),
+            Context::None => ptr::null()
         }
     }
 
     pub fn swap_buffers(&self) {
-        unsafe { ffi::glx::SwapBuffers(self.x.display as *mut _, self.x.window) }
+        match self.x.context {
+            Context::Glx(ref ctxt) => ctxt.swap_buffers(),
+            //Context::Egl(ref ctxt) => ctxt.swap_buffers(),
+            Context::None => {}
+        }
     }
 
     pub fn platform_display(&self) -> *mut libc::c_void {
@@ -777,7 +705,11 @@ impl Window {
 
     /// See the docs in the crate root file.
     pub fn get_api(&self) -> ::Api {
-        ::Api::OpenGl
+        match self.x.context {
+            Context::Glx(ref ctxt) => ctxt.get_api(),
+            //Context::Egl(ref ctxt) => ctxt.get_api(),
+            Context::None => panic!()
+        }
     }
 
     pub fn get_pixel_format(&self) -> PixelFormat {