From 86af6b6387918ea93fe5ce4cae2764a1d196061e Mon Sep 17 00:00:00 2001
From: Patrick Horlebein <patrick@ilovepatrick.de>
Date: Mon, 29 Dec 2014 13:26:44 +0100
Subject: [PATCH] Started adding support for selection OpenGL versions on OS X.
 Needs issue #176 to be fixed.

---
 src/osx/mod.rs | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/osx/mod.rs b/src/osx/mod.rs
index 7df66039..59b6577b 100644
--- a/src/osx/mod.rs
+++ b/src/osx/mod.rs
@@ -44,6 +44,15 @@ static mut alt_pressed: bool = false;
 static DELEGATE_NAME: &'static [u8] = b"glutin_window_delegate\0";
 static DELEGATE_STATE_IVAR: &'static [u8] = b"glutin_state";
 
+// TODO: Should be added to cocoa bindings
+#[allow(non_camel_case_types)]
+#[deriving(Show)]
+enum NSOpenGLPFAOpenGLProfiles {
+    NSOpenGLProfileVersionLegacy = 0x1000,
+    NSOpenGLProfileVersion3_2Core = 0x3200,
+    NSOpenGLProfileVersion4_1Core = 0x4100
+}
+
 struct DelegateState<'a> {
     is_closed: bool,
     context: id,
@@ -68,7 +77,7 @@ impl Window {
             unimplemented!()
         }
 
-        Window::new_impl(builder.dimensions, builder.title.as_slice(), builder.monitor, builder.vsync, builder.visible)
+        Window::new_impl(builder.dimensions, builder.title.as_slice(), builder.monitor, builder.vsync, builder.visible, builder.gl_version)
     }
 }
 
@@ -130,7 +139,7 @@ extern fn window_did_resize(this: id, _: id) -> id {
 
 impl Window {
     fn new_impl(dimensions: Option<(uint, uint)>, title: &str, monitor: Option<MonitorID>,
-                vsync: bool, visible: bool) -> Result<Window, CreationError> {
+                vsync: bool, visible: bool, gl_version: Option<(uint, uint)>) -> Result<Window, CreationError> {
         let app = match Window::create_app() {
             Some(app) => app,
             None      => { return Err(OsError(format!("Couldn't create NSApplication"))); },
@@ -144,7 +153,7 @@ impl Window {
             None       => { return Err(OsError(format!("Couldn't create NSView"))); },
         };
 
-        let context = match Window::create_context(view, vsync) {
+        let context = match Window::create_context(view, vsync, gl_version) {
             Some(context) => context,
             None          => { return Err(OsError(format!("Couldn't create OpenGL context"))); },
         };
@@ -260,7 +269,16 @@ impl Window {
         }
     }
 
-    fn create_context(view: id, vsync: bool) -> Option<id> {
+    fn create_context(view: id, vsync: bool, gl_version: Option<(uint, uint)>) -> Option<id> {
+        let profile = {
+            match gl_version {
+                None => NSOpenGLPFAOpenGLProfiles::NSOpenGLProfileVersionLegacy as uint,
+                Some((0...2, _)) => NSOpenGLPFAOpenGLProfiles::NSOpenGLProfileVersionLegacy as uint,
+                Some((3, 0)) => NSOpenGLPFAOpenGLProfiles::NSOpenGLProfileVersionLegacy as uint,
+                Some((3, 1...2)) => NSOpenGLPFAOpenGLProfiles::NSOpenGLProfileVersion3_2Core as uint,
+                Some((_, _)) => NSOpenGLPFAOpenGLProfiles::NSOpenGLProfileVersion4_1Core as uint,
+            }
+        };
         unsafe {
             let attributes = [
                 NSOpenGLPFADoubleBuffer as uint,
@@ -269,6 +287,7 @@ impl Window {
                 NSOpenGLPFAAlphaSize as uint, 8,
                 NSOpenGLPFADepthSize as uint, 24,
                 NSOpenGLPFAStencilSize as uint, 8,
+                NSOpenGLPFAOpenGLProfile as uint, profile,
                 0
             ];