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.cpp

@@ -268,22 +268,38 @@ bool MyApp::OnInit()
 int MyApp::OnExit()
 {
     delete m_glContext;
+    delete m_glStereoContext;
 
     return wxApp::OnExit();
 }
 
-TestGLContext& MyApp::GetContext(wxGLCanvas *canvas)
+TestGLContext& MyApp::GetContext(wxGLCanvas *canvas, bool useStereo)
 {
-    if ( !m_glContext )
+    TestGLContext *glContext;
+    if ( useStereo )
     {
-        // Create the OpenGL context for the first window which needs it:
+        if ( !m_glStereoContext )
-        // subsequently created windows will all share the same context.
+        {
-        m_glContext = new TestGLContext(canvas);
+            // Create the OpenGL context for the first stereo window which needs it:
+            // subsequently created windows will all share the same context.
+            m_glStereoContext = new TestGLContext(canvas);
+        }
+        glContext = m_glStereoContext;
+    }
+    else
+    {
+        if ( !m_glContext )
+        {
+            // Create the OpenGL context for the first mono window which needs it:
+            // subsequently created windows will all share the same context.
+            m_glContext = new TestGLContext(canvas);
+        }
+        glContext = m_glContext;
     }
 
-    m_glContext->SetCurrent(*canvas);
+    glContext->SetCurrent(*canvas);
 
-    return *m_glContext;
+    return *glContext;
 }
 
 // ----------------------------------------------------------------------------
@@ -296,18 +312,30 @@ BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
     EVT_TIMER(SpinTimer, TestGLCanvas::OnSpinTimer)
 END_EVENT_TABLE()
 
-TestGLCanvas::TestGLCanvas(wxWindow *parent)
+TestGLCanvas::TestGLCanvas(wxWindow *parent, int *attribList)
     // With perspective OpenGL graphics, the wxFULL_REPAINT_ON_RESIZE style
     // flag should always be set, because even making the canvas smaller should
     // be followed by a paint event that updates the entire canvas with new
     // viewport settings.
-    : wxGLCanvas(parent, wxID_ANY, NULL /* attribs */,
+    : wxGLCanvas(parent, wxID_ANY, attribList,
                  wxDefaultPosition, wxDefaultSize,
                  wxFULL_REPAINT_ON_RESIZE),
       m_xangle(30.0),
       m_yangle(30.0),
-      m_spinTimer(this,SpinTimer)
+      m_spinTimer(this,SpinTimer),
+      m_useStereo(false),
+      m_stereoWarningAlreadyDisplayed(false)
 {
+    if ( attribList )
+    {
+        int i = 0;
+        while ( attribList[i] != 0 )
+        {
+            if ( attribList[i] == WX_GL_STEREO )
+                m_useStereo = true;
+            ++i;
+        }
+    }
 }
 
 void TestGLCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
@@ -323,11 +351,36 @@ void TestGLCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
     // is wrong when next another canvas is repainted.
     const wxSize ClientSize = GetClientSize();
 
-    TestGLContext& canvas = wxGetApp().GetContext(this);
+    TestGLContext& canvas = wxGetApp().GetContext(this, m_useStereo);
     glViewport(0, 0, ClientSize.x, ClientSize.y);
 
     // Render the graphics and swap the buffers.
-    canvas.DrawRotatedCube(m_xangle, m_yangle);
+    GLboolean quadStereoSupported;
+    glGetBooleanv( GL_STEREO, &quadStereoSupported);
+    if ( quadStereoSupported )
+    {
+        glDrawBuffer( GL_BACK_LEFT );
+        glMatrixMode(GL_PROJECTION);
+        glLoadIdentity();
+        glFrustum(-0.47f, 0.53f, -0.5f, 0.5f, 1.0f, 3.0f);
+        canvas.DrawRotatedCube(m_xangle, m_yangle);
+        CheckGLError();
+        glDrawBuffer( GL_BACK_RIGHT );
+        glMatrixMode(GL_PROJECTION);
+        glLoadIdentity();
+        glFrustum(-0.53f, 0.47f, -0.5f, 0.5f, 1.0f, 3.0f);
+        canvas.DrawRotatedCube(m_xangle, m_yangle);
+        CheckGLError();
+    }
+    else
+    {
+        canvas.DrawRotatedCube(m_xangle, m_yangle);
+        if ( m_useStereo && !m_stereoWarningAlreadyDisplayed )
+        {
+            m_stereoWarningAlreadyDisplayed = true;
+            wxLogError("Stereo not supported by the graphics card.");
+        }
+    }
     SwapBuffers();
 }
 
@@ -379,6 +432,21 @@ void TestGLCanvas::OnSpinTimer(wxTimerEvent& WXUNUSED(event))
     Spin(0.0, 4.0);
 }
 
+wxString glGetwxString(GLenum name)
+{
+    const GLubyte *v = glGetString(name);
+    if ( v == 0 )
+    {
+        // The error is not important. It is GL_INVALID_ENUM.
+        // We just want to clear the error stack.
+        glGetError();
+
+        return wxString();
+    }
+
+    return wxString((const char*)v);
+}
+
 
 // ----------------------------------------------------------------------------
 // MyFrame: main application window
@@ -386,19 +454,23 @@ void TestGLCanvas::OnSpinTimer(wxTimerEvent& WXUNUSED(event))
 
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
     EVT_MENU(wxID_NEW, MyFrame::OnNewWindow)
+    EVT_MENU(NEW_STEREO_WINDOW, MyFrame::OnNewStereoWindow)
     EVT_MENU(wxID_CLOSE, MyFrame::OnClose)
 END_EVENT_TABLE()
 
-MyFrame::MyFrame()
+MyFrame::MyFrame( bool stereoWindow )
        : wxFrame(NULL, wxID_ANY, wxT("wxWidgets OpenGL Cube Sample"))
 {
-    new TestGLCanvas(this);
+    int stereoAttribList[] = { WX_GL_RGBA, WX_GL_DOUBLEBUFFER, WX_GL_STEREO, 0 };
+
+    new TestGLCanvas(this, stereoWindow ? stereoAttribList : NULL);
 
     SetIcon(wxICON(sample));
 
     // Make a menubar
     wxMenu *menu = new wxMenu;
     menu->Append(wxID_NEW);
+    menu->Append(NEW_STEREO_WINDOW, "New Stereo Window");
     menu->AppendSeparator();
     menu->Append(wxID_CLOSE);
     wxMenuBar *menuBar = new wxMenuBar;
@@ -415,6 +487,15 @@ MyFrame::MyFrame()
     static const int attribs[] = { WX_GL_RGBA, WX_GL_DOUBLEBUFFER, 0 };
     wxLogStatus("Double-buffered display %s supported",
                 wxGLCanvas::IsDisplaySupported(attribs) ? "is" : "not");
+
+    if ( stereoWindow )
+    {
+        const wxString vendor = glGetwxString(GL_VENDOR).Lower();
+        const wxString renderer = glGetwxString(GL_RENDERER).Lower();
+        if ( vendor.find("nvidia") != wxString::npos &&
+                renderer.find("quadro") == wxString::npos )
+            ShowFullScreen(true);
+    }
 }
 
 void MyFrame::OnClose(wxCommandEvent& WXUNUSED(event))
@@ -428,3 +509,7 @@ void MyFrame::OnNewWindow( wxCommandEvent& WXUNUSED(event) )
     new MyFrame();
 }
 
+void MyFrame::OnNewStereoWindow( wxCommandEvent& WXUNUSED(event) )
+{
+    new MyFrame(true);
+}

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_