[grits] Add some stubbed code for Mac OS support

[Andy Spencer <andys src gnome org>]

commit 6c98281f93edb654fdf1586f8c3cfed811457e3e
Author: Andy Spencer <andy753421 gmail com>
Date:   Sat Jun 18 22:12:38 2011 +0000

    Add some stubbed code for Mac OS support
    
    (This won't compile yet)

 src/gtkgl.c |   40 ++++++++++++++++++++++++++++++++++++----
 1 files changed, 36 insertions(+), 4 deletions(-)
---
diff --git a/src/gtkgl.c b/src/gtkgl.c
index 9a2909a..6812d33 100644
--- a/src/gtkgl.c
+++ b/src/gtkgl.c
@@ -172,10 +172,42 @@ void gtk_gl_disable(GtkWidget *widget)
  * Mac OSX implementation *
  **************************/
 #elif defined(USE_CGL)
-void gtk_gl_enable(GtkWidget *widget) { }
-void gtk_gl_begin(GtkWidget *widget) { }
-void gtk_gl_end(GtkWidget *widget) { }
-void gtk_gl_disable(GtkWidget *widget) { }
+void gtk_gl_enable(GtkWidget *widget)
+{
+	CGDisplayCapture( kCGDirectMainDisplay );
+	CGLPixelFormatAttribute attribs[] =
+	{
+		kCGLPFANoRecovery,
+		kCGLPFADoubleBuffer,
+		kCGLPFAFullScreen,
+		kCGLPFAStencilSize, ( CGLPixelFormatAttribute ) 8,
+		kCGLPFADisplayMask, ( CGLPixelFormatAttribute ) CGDisplayIDToOpenGLDisplayMask( kCGDirectMainDisplay ),
+		( CGLPixelFormatAttribute ) NULL
+	};
+
+	CGLPixelFormatObj pixelFormatObj;
+	GLint numPixelFormats;
+	CGLChoosePixelFormat( attribs, &pixelFormatObj, &numPixelFormats );
+
+	CGLCreateContext( pixelFormatObj, NULL, &contextObj );
+
+	CGLDestroyPixelFormat( pixelFormatObj );
+
+	CGLSetCurrentContext( contextObj );
+	CGLSetFullScreen( contextObj );
+}
+
+void gtk_gl_begin(GtkWidget *widget)
+{
+}
+
+void gtk_gl_end(GtkWidget *widget)
+{
+}
+
+void gtk_gl_disable(GtkWidget *widget)
+{
+}
 
 
 /****************************