Changed OpenGL support for the Mac OS X platform: use cocoa instead of deprecated AGL.

All changes are mac-specific, except a very minor change in file src/gl_draw.cxx
where string drawing wrongly claimed to support @symbol, not possible
because symbols are drawn using non-GL primitives.

Unchanged application code can use the new FLTK code.
In addition, the new code allows mac applications to draw OpenGL scenes
at high resolution on so-called 'retina' displays, but this requires some
support from app code. They must call, before opening GL windows,
Fl::use_high_resolution(1);
and change their glViewport() calls as follows
glViewport(0, 0, pxel_w(), pixel_h());
This uses 2 new member functions of the Fl_Gl_Window class,
pixel_w() and pixel_h() returning the window dimensions in pixel
units, that is, twice the w() and h() when the window is mapped
on a retina display.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10498 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 13 insertions, 0 deletions

diff --git a/FL/Fl.H b/FL/Fl.H
index cc223dba8..259e14371 100644
--- a/FL/Fl.H
+++ b/FL/Fl.H
@@ -125,6 +125,9 @@ typedef void (*Fl_Clipboard_Notify_Handler)(int source, void *data);
 class FL_EXPORT Fl {
   Fl() {}; // no constructor!
   
+private:
+  static int use_high_res_GL_;
+  
 public: // should be private!
 #ifndef FL_DOXYGEN
   static int e_number;
@@ -1206,6 +1209,16 @@ public:
   static void release_widget_pointer(Fl_Widget *&w);
   static void clear_widget_pointer(Fl_Widget const *w);
   /** @} */
+  
+  /**  sets whether GL windows should be drawn at high resolution on Apple
+   computers with retina displays
+   */
+  static void use_high_res_GL(int val) { use_high_res_GL_ = val; }
+  /**  returns whether GL windows should be drawn at high resolution on Apple
+   computers with retina displays.
+   Default is no.
+   */
+  static int use_high_res_GL() { return use_high_res_GL_; }
 
 #ifdef FLTK_HAVE_CAIRO
   /** \defgroup group_cairo Cairo support functions and classes