Add code showing stereo support to the OpenGL cube sample.

Show how WX_GL_STEREO attribute can be used, if available.

See #15434.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74819 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/opengl/cube/cube.h

@@ -31,30 +31,33 @@ private:
 class MyApp : public wxApp
 {
 public:
-    MyApp() { m_glContext = NULL; }
+    MyApp() { m_glContext = NULL; m_glStereoContext = NULL; }
 
     // Returns the shared context used by all frames and sets it as current for
     // the given canvas.
-    TestGLContext& GetContext(wxGLCanvas *canvas);
+    TestGLContext& GetContext(wxGLCanvas *canvas, bool useStereo);
 
     // virtual wxApp methods
     virtual bool OnInit();
     virtual int OnExit();
 
 private:
-    // the GL context we use for all our windows
+    // the GL context we use for all our mono rendering windows
     TestGLContext *m_glContext;
+    // the GL context we use for all our stereo rendering windows
+    TestGLContext *m_glStereoContext;
 };
 
 // Define a new frame type
 class MyFrame : public wxFrame
 {
 public:
-    MyFrame();
+    MyFrame(bool stereoWindow = false);
 
 private:
     void OnClose(wxCommandEvent& event);
     void OnNewWindow(wxCommandEvent& event);
+    void OnNewStereoWindow(wxCommandEvent& event);
 
     DECLARE_EVENT_TABLE()
 };
@@ -62,7 +65,7 @@ private:
 class TestGLCanvas : public wxGLCanvas
 {
 public:
-    TestGLCanvas(wxWindow *parent);
+    TestGLCanvas(wxWindow *parent, int *attribList = NULL);
 
 private:
     void OnPaint(wxPaintEvent& event);
@@ -75,8 +78,15 @@ private:
           m_yangle;
 
     wxTimer m_spinTimer;
+    bool m_useStereo,
+         m_stereoWarningAlreadyDisplayed;
 
     DECLARE_EVENT_TABLE()
 };
 
+enum
+{
+    NEW_STEREO_WINDOW = wxID_HIGHEST + 1
+};
+
 #endif // _WX_CUBE_H_