Replaced static initializer with Fl_OpenGL_Display_Device.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11008 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/Fl.H

@@ -146,7 +146,7 @@ public: // run time information about compile time configuration
   static bool cfg_gfx_gdi;    ///< GDI redering available, usually on MSWindows systems
   static bool cfg_gfx_opengl; ///< OpenGL redering available, available on many platforms
   static bool cfg_gfx_cairo;  ///< Cairo redering available, available on many platforms
-  static bool cfg_gfx_directx;///< DirectX redering available, available on many platforms
+  static bool cfg_gfx_directx;///< DirectX redering available, usually on MSWindows systems
   /** @} */
   /** \defgroup cfg_prn runtime printer driver configuration */
   /** @{ */

FL/Fl_Gl_Window.H

@@ -24,6 +24,30 @@
 
 #include "Fl_Window.H"
 
+
+// ------ this should be in a separate file! -----------------------------------
+#ifdef FL_CFG_GFX_OPENGL
+
+#include <FL/Fl_Device.h>
+
+class Fl_OpenGL_Graphics_Driver;
+/**
+ OpenGL Surface.
+ This surface is needed as an interface between GL windows and the GL graphics driver.
+ */
+class FL_EXPORT Fl_OpenGL_Display_Device : public Fl_Surface_Device {
+public:
+  static const char *class_id;
+  const char *class_name() {return class_id;};
+  Fl_OpenGL_Display_Device(Fl_OpenGL_Graphics_Driver *graphics_driver);
+  static Fl_OpenGL_Display_Device *display_device();
+};
+
+#endif
+// ------ end of separate file! ------------------------------------------------
+
+
+
 #ifndef GLContext
 /**
   Opaque pointer type to hide system specific implementation.

src/Fl_Gl_Window.cxx

@@ -151,7 +151,21 @@ public:
 
 const char *Fl_OpenGL_Graphics_Driver::class_id = "Fl_OpenGL_Graphics_Driver";
 
-Fl_OpenGL_Graphics_Driver fl_opengl_graphics_driver;
+Fl_OpenGL_Display_Device *Fl_OpenGL_Display_Device::display_device() {
+  static Fl_OpenGL_Display_Device *display = new Fl_OpenGL_Display_Device(new Fl_OpenGL_Graphics_Driver());
+  return display;
+};
+
+
+Fl_OpenGL_Display_Device::Fl_OpenGL_Display_Device(Fl_OpenGL_Graphics_Driver *graphics_driver)
+: Fl_Surface_Device(graphics_driver)
+{
+}
+
+
+const char *Fl_OpenGL_Display_Device::class_id = "Fl_OpenGL_Display_Device";
+
+
 
 #endif
 // ------ end of separate file! ------------------------------------------------
@@ -659,8 +673,8 @@ void Fl_Gl_Window::draw_overlay() {}
 */
 void Fl_Gl_Window::draw() {
 #ifdef FL_CFG_GFX_OPENGL
-  Fl_Graphics_Driver *prev_driver = fl_graphics_driver;
+  Fl_Surface_Device *prev_device = Fl_Surface_Device::surface();
-  fl_graphics_driver = &fl_opengl_graphics_driver;
+  Fl_OpenGL_Display_Device::display_device()->set_current();
   glPushAttrib(GL_ENABLE_BIT);
   glDisable(GL_DEPTH_TEST);
   glPushMatrix();
@@ -673,7 +687,7 @@ void Fl_Gl_Window::draw() {
 
   glPopMatrix();
   glPushAttrib(GL_ENABLE_BIT);
-  fl_graphics_driver = prev_driver;
+  prev_device->set_current();
 #else
   Fl::fatal("Fl_Gl_Window::draw() *must* be overriden. Please refer to the documentation.");
 #endif

src/Fl_Image_Surface.cxx

@@ -82,6 +82,7 @@ Fl_Image_Surface::~Fl_Image_Surface() {
 
 /** Returns an image made of all drawings sent to the Fl_Image_Surface object.
  The returned object contains its own copy of the RGB data.
+ The caller is responsible for deleting the image.
  */
 Fl_RGB_Image* Fl_Image_Surface::image()
 {