prevent explicitly set client size from being changed when frame extents become known

[wxWidgets.git] / samples / opengl / cube / cube.cpp

diff --git a/samples/opengl/cube/cube.cpp b/samples/opengl/cube/cube.cpp
index b5f5ba419e1dfc45a62c0b6dc9f71df53bbfa80e..411979b571040299f32c67cbb9e7c7ea29ebe31c 100644 (file)
--- a/samples/opengl/cube/cube.cpp
+++ b/samples/opengl/cube/cube.cpp
@@ -38,6 +38,82 @@
     #include "../../sample.xpm"
 #endif
 
     #include "../../sample.xpm"
 #endif
 

+// ----------------------------------------------------------------------------
+// helper functions
+// ----------------------------------------------------------------------------
+
+static void CheckGLError()
+{
+    GLenum errLast = GL_NO_ERROR;
+
+    for ( ;; )
+    {
+        GLenum err = glGetError();
+        if ( err == GL_NO_ERROR )
+            return;
+
+        // normally the error is reset by the call to glGetError() but if
+        // glGetError() itself returns an error, we risk looping forever here
+        // so check that we get a different error than the last time
+        if ( err == errLast )
+        {
+            wxLogError(_T("OpenGL error state couldn't be reset."));
+            return;
+        }
+
+        errLast = err;
+
+        wxLogError(_T("OpenGL error %d"), err);
+    }
+}
+
+// function to draw the texture for cube faces
+static wxImage DrawDice(int size, unsigned num)
+{
+    wxASSERT_MSG( num >= 1 && num <= 6, _T("invalid dice index") );
+
+    const int dot = size/16;        // radius of a single dot
+    const int gap = 5*size/32;      // gap between dots
+
+    wxBitmap bmp(size, size);
+    wxMemoryDC dc;
+    dc.SelectObject(bmp);
+    dc.SetBackground(*wxWHITE_BRUSH);
+    dc.Clear();
+    dc.SetBrush(*wxBLACK_BRUSH);
+
+    // the upper left and lower right points
+    if ( num != 1 )
+    {
+        dc.DrawCircle(gap + dot, gap + dot, dot);
+        dc.DrawCircle(size - gap - dot, size - gap - dot, dot);
+    }
+
+    // draw the central point for odd dices
+    if ( num % 2 )
+    {
+        dc.DrawCircle(size/2, size/2, dot);
+    }
+
+    // the upper right and lower left points
+    if ( num > 3 )
+    {
+        dc.DrawCircle(size - gap - dot, gap + dot, dot);
+        dc.DrawCircle(gap + dot, size - gap - dot, dot);
+    }
+
+    // finally those 2 are only for the last dice
+    if ( num == 6 )
+    {
+        dc.DrawCircle(gap + dot, size/2, dot);
+        dc.DrawCircle(size - gap - dot, size/2, dot);
+    }
+
+    dc.SelectObject(wxNullBitmap);
+
+    return bmp.ConvertToImage();
+}
+

 // ============================================================================
 // implementation
 // ============================================================================
 // ============================================================================
 // implementation
 // ============================================================================


@@ -66,141 +142,182 @@ int MyApp::OnExit()
     return wxApp::OnExit();
 }
 
     return wxApp::OnExit();
 }
 

-void MyApp::SetCurrent(wxGLCanvas *canvas)
+TestGLContext& MyApp::GetContext(wxGLCanvas *canvas)

 {
 {

-    wxCHECK_RET( canvas, _T("canvas can't be NULL") );
-

     if ( !m_glContext )
     if ( !m_glContext )

-        m_glContext = new wxGLContext(canvas);
+        m_glContext = new TestGLContext(canvas);
+    else
+        m_glContext->SetCurrent(*canvas);

 
 

-    m_glContext->SetCurrent(*canvas);
+    return *m_glContext;

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------

-// TestGLCanvas
+// TestGLContext

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
-    EVT_SIZE(TestGLCanvas::OnSize)
-    EVT_PAINT(TestGLCanvas::OnPaint)
+TestGLContext::TestGLContext(wxGLCanvas *canvas)
+             : wxGLContext(canvas)
+{
+    SetCurrent(*canvas);

 
 

-    EVT_KEY_DOWN(TestGLCanvas::OnKeyDown)
-END_EVENT_TABLE()
+    // set up the parameters we want to use
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_LIGHTING);
+    glEnable(GL_LIGHT0);
+    glEnable(GL_TEXTURE_2D);

 
 

-static /* const */ int attribs[] = { WX_GL_RGBA, WX_GL_DOUBLEBUFFER, 0 };
+    // add slightly more light, the default lightning is rather dark
+    GLfloat ambient[] = { 0.5, 0.5, 0.5, 0.5 };
+    glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);

 
 

-TestGLCanvas::TestGLCanvas(wxWindow *parent)
-            : wxGLCanvas(parent, wxID_ANY, attribs)
-{
-    m_gllist = 0;
+    // set viewing projection
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glFrustum(-0.5f, 0.5f, -0.5f, 0.5f, 1.0f, 3.0f);

 
 

-    // notice that we can't call InitGL() from here: we must wait until the
-    // window is shown on screen to be able to perform OpenGL calls
-}
+    // create the textures to use for cube sides: they will be reused by all
+    // canvases (which is probably not critical in the case of simple textures
+    // we use here but could be really important for a real application where
+    // each texture could take many megabytes)
+    glGenTextures(WXSIZEOF(m_textures), m_textures);

 
 

-// this function is called on each repaint so it should be fast
-void TestGLCanvas::Render()
-{
-    wxGetApp().SetCurrent(this);
+    for ( unsigned i = 0; i < WXSIZEOF(m_textures); i++ )
+    {
+        glBindTexture(GL_TEXTURE_2D, m_textures[i]);

 
 

-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-    glCallList(m_gllist);
+        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

 
 

-    glFlush();
-    SwapBuffers();
+        const wxImage img(DrawDice(256, i + 1));
+
+        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img.GetWidth(), img.GetHeight(), 
+                     0, GL_RGB, GL_UNSIGNED_BYTE, img.GetData());
+    }
+
+    CheckGLError();

 }
 
 }
 

-void TestGLCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
+void TestGLContext::DrawRotatedCube(float xangle, float yangle)

 {
 {

-    // initialize if not done yet
-    InitGL();
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

 
 

-    wxPaintDC dc(this);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslatef(0.0f, 0.0f, -2.0f);
+    glRotatef(xangle, 1.0f, 0.0f, 0.0f);
+    glRotatef(yangle, 0.0f, 1.0f, 0.0f);

 
 

-    Render();
-}
+    // draw six faces of a cube of size 1 centered at (0, 0, 0)
+    glBindTexture(GL_TEXTURE_2D, m_textures[0]);
+    glBegin(GL_QUADS);
+        glNormal3f( 0.0f, 0.0f, 1.0f);
+        glTexCoord2f(0, 0); glVertex3f( 0.5f, 0.5f, 0.5f);
+        glTexCoord2f(1, 0); glVertex3f(-0.5f, 0.5f, 0.5f);
+        glTexCoord2f(1, 1); glVertex3f(-0.5f,-0.5f, 0.5f);
+        glTexCoord2f(0, 1); glVertex3f( 0.5f,-0.5f, 0.5f);
+    glEnd();

 
 

-void TestGLCanvas::OnSize(wxSizeEvent& event)
-{
-    // don't prevent default processing from taking place
-    event.Skip();
+    glBindTexture(GL_TEXTURE_2D, m_textures[1]);
+    glBegin(GL_QUADS);
+        glNormal3f( 0.0f, 0.0f,-1.0f);
+        glTexCoord2f(0, 0); glVertex3f(-0.5f,-0.5f,-0.5f);
+        glTexCoord2f(1, 0); glVertex3f(-0.5f, 0.5f,-0.5f);
+        glTexCoord2f(1, 1); glVertex3f( 0.5f, 0.5f,-0.5f);
+        glTexCoord2f(0, 1); glVertex3f( 0.5f,-0.5f,-0.5f);
+    glEnd();

 
 

-    if ( !IsInitialized() )
-        return;
+    glBindTexture(GL_TEXTURE_2D, m_textures[2]);
+    glBegin(GL_QUADS);
+        glNormal3f( 0.0f, 1.0f, 0.0f);
+        glTexCoord2f(0, 0); glVertex3f( 0.5f, 0.5f, 0.5f);
+        glTexCoord2f(1, 0); glVertex3f( 0.5f, 0.5f,-0.5f);
+        glTexCoord2f(1, 1); glVertex3f(-0.5f, 0.5f,-0.5f);
+        glTexCoord2f(0, 1); glVertex3f(-0.5f, 0.5f, 0.5f);
+    glEnd();

 
 

-    // set GL viewport (not called by wxGLCanvas::OnSize on all platforms...)
-    int w, h;
-    GetClientSize(&w, &h);
+    glBindTexture(GL_TEXTURE_2D, m_textures[3]);
+    glBegin(GL_QUADS);
+        glNormal3f( 0.0f,-1.0f, 0.0f);
+        glTexCoord2f(0, 0); glVertex3f(-0.5f,-0.5f,-0.5f);
+        glTexCoord2f(1, 0); glVertex3f( 0.5f,-0.5f,-0.5f);
+        glTexCoord2f(1, 1); glVertex3f( 0.5f,-0.5f, 0.5f);
+        glTexCoord2f(0, 1); glVertex3f(-0.5f,-0.5f, 0.5f);
+    glEnd();

 
 

-    wxGetApp().SetCurrent(this);
-    glViewport(0, 0, w, h);
-}
+    glBindTexture(GL_TEXTURE_2D, m_textures[4]);
+    glBegin(GL_QUADS);
+        glNormal3f( 1.0f, 0.0f, 0.0f);
+        glTexCoord2f(0, 0); glVertex3f( 0.5f, 0.5f, 0.5f);
+        glTexCoord2f(1, 0); glVertex3f( 0.5f,-0.5f, 0.5f);
+        glTexCoord2f(1, 1); glVertex3f( 0.5f,-0.5f,-0.5f);
+        glTexCoord2f(0, 1); glVertex3f( 0.5f, 0.5f,-0.5f);
+    glEnd();

 
 

-void TestGLCanvas::InitGL()
-{
-    if ( IsInitialized() )
-        return;
+    glBindTexture(GL_TEXTURE_2D, m_textures[5]);
+    glBegin(GL_QUADS);
+        glNormal3f(-1.0f, 0.0f, 0.0f);
+        glTexCoord2f(0, 0); glVertex3f(-0.5f,-0.5f,-0.5f);
+        glTexCoord2f(1, 0); glVertex3f(-0.5f,-0.5f, 0.5f);
+        glTexCoord2f(1, 1); glVertex3f(-0.5f, 0.5f, 0.5f);
+        glTexCoord2f(0, 1); glVertex3f(-0.5f, 0.5f,-0.5f);
+    glEnd();

 
 

-    wxGetApp().SetCurrent(this);
+    glFlush();

 
 

-    /* set viewing projection */
-    glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-    glFrustum(-0.5f, 0.5f, -0.5f, 0.5f, 1.0f, 3.0f);
+    CheckGLError();
+}

 
 

-    /* position viewer */
-    glMatrixMode(GL_MODELVIEW);
-    glLoadIdentity();
-    glTranslatef(0.0f, 0.0f, -2.0f);
+// ----------------------------------------------------------------------------
+// TestGLCanvas
+// ----------------------------------------------------------------------------

 
 

-    /* position object */
-    glRotatef(30.0f, 1.0f, 0.0f, 0.0f);
-    glRotatef(30.0f, 0.0f, 1.0f, 0.0f);
+BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
+    EVT_SIZE(TestGLCanvas::OnSize)
+    EVT_PAINT(TestGLCanvas::OnPaint)

 
 

-    glEnable(GL_DEPTH_TEST);
-    glEnable(GL_LIGHTING);
-    glEnable(GL_LIGHT0);
+    EVT_KEY_DOWN(TestGLCanvas::OnKeyDown)
+END_EVENT_TABLE()

 
 

-    // create the list of commands to draw the cube: then we can just (quickly)
-    // execute it in Render() later
-    m_gllist = glGenLists(1);
-    glNewList(m_gllist, GL_COMPILE);
+TestGLCanvas::TestGLCanvas(wxWindow *parent)
+            : wxGLCanvas(parent, wxID_ANY, NULL /* attribs */)
+{
+    m_xangle =
+    m_yangle = 30;
+}

 
 

-    /* draw six faces of a cube */
-    glBegin(GL_QUADS);
-    glNormal3f( 0.0f, 0.0f, 1.0f);
-    glVertex3f( 0.5f, 0.5f, 0.5f); glVertex3f(-0.5f, 0.5f, 0.5f);
-    glVertex3f(-0.5f,-0.5f, 0.5f); glVertex3f( 0.5f,-0.5f, 0.5f);
+void TestGLCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
+{
+    wxPaintDC dc(this);

 
 

-    glNormal3f( 0.0f, 0.0f,-1.0f);
-    glVertex3f(-0.5f,-0.5f,-0.5f); glVertex3f(-0.5f, 0.5f,-0.5f);
-    glVertex3f( 0.5f, 0.5f,-0.5f); glVertex3f( 0.5f,-0.5f,-0.5f);
+    wxGetApp().GetContext(this).DrawRotatedCube(m_xangle, m_yangle);

 
 

-    glNormal3f( 0.0f, 1.0f, 0.0f);
-    glVertex3f( 0.5f, 0.5f, 0.5f); glVertex3f( 0.5f, 0.5f,-0.5f);
-    glVertex3f(-0.5f, 0.5f,-0.5f); glVertex3f(-0.5f, 0.5f, 0.5f);
+    SwapBuffers();
+}

 
 

-    glNormal3f( 0.0f,-1.0f, 0.0f);
-    glVertex3f(-0.5f,-0.5f,-0.5f); glVertex3f( 0.5f,-0.5f,-0.5f);
-    glVertex3f( 0.5f,-0.5f, 0.5f); glVertex3f(-0.5f,-0.5f, 0.5f);
+void TestGLCanvas::OnSize(wxSizeEvent& event)
+{
+    // don't prevent default processing from taking place
+    event.Skip();

 
 

-    glNormal3f( 1.0f, 0.0f, 0.0f);
-    glVertex3f( 0.5f, 0.5f, 0.5f); glVertex3f( 0.5f,-0.5f, 0.5f);
-    glVertex3f( 0.5f,-0.5f,-0.5f); glVertex3f( 0.5f, 0.5f,-0.5f);
+    if ( !IsShownOnScreen() )
+        return;

 
 

-    glNormal3f(-1.0f, 0.0f, 0.0f);
-    glVertex3f(-0.5f,-0.5f,-0.5f); glVertex3f(-0.5f,-0.5f, 0.5f);
-    glVertex3f(-0.5f, 0.5f, 0.5f); glVertex3f(-0.5f, 0.5f,-0.5f);
-    glEnd();
+    // set GL viewport (not called by wxGLCanvas::OnSize on all platforms...)
+    int w, h;
+    GetClientSize(&w, &h);

 
 

-    glEndList();
+    wxGetApp().GetContext(this);
+    glViewport(0, 0, w, h);

 }
 
 void TestGLCanvas::OnKeyDown( wxKeyEvent& event )
 {
 }
 
 void TestGLCanvas::OnKeyDown( wxKeyEvent& event )
 {

-    GLfloat x = 0,
-            y = 0,
-            z = 0;
+    float *p = NULL;

 
     bool inverse = false;
 
 
     bool inverse = false;
 


@@ -211,8 +328,8 @@ void TestGLCanvas::OnKeyDown( wxKeyEvent& event )
             // fall through
 
         case WXK_LEFT:
             // fall through
 
         case WXK_LEFT:

-            // rotate around Z axis
-            z = 1;
+            // rotate around Y axis
+            p = &m_yangle;

             break;
 
         case WXK_DOWN:
             break;
 
         case WXK_DOWN:


@@ -220,8 +337,8 @@ void TestGLCanvas::OnKeyDown( wxKeyEvent& event )
             // fall through
 
         case WXK_UP:
             // fall through
 
         case WXK_UP:

-            // rotate around Y axis
-            y = 1;
+            // rotate around X axis
+            p = &m_xangle;

             break;
 
         default:
             break;
 
         default:


@@ -233,18 +350,9 @@ void TestGLCanvas::OnKeyDown( wxKeyEvent& event )
     if ( inverse )
         angle = -angle;
 
     if ( inverse )
         angle = -angle;
 

-    wxGetApp().SetCurrent(this);
-
-    glMatrixMode(GL_MODELVIEW);
-    glRotatef(angle, x, y, z);
+    *p += angle;

 
 

-    // refresh all cubes
-    for ( wxWindowList::const_iterator i = wxTopLevelWindows.begin();
-          i != wxTopLevelWindows.end();
-          ++i )
-    {
-        (*i)->Refresh(false);
-    }
+    Refresh(false);

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -252,31 +360,34 @@ void TestGLCanvas::OnKeyDown( wxKeyEvent& event )
 // ----------------------------------------------------------------------------
 
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 // ----------------------------------------------------------------------------
 
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)

-    EVT_MENU(wxID_EXIT, MyFrame::OnExit)

     EVT_MENU(wxID_NEW, MyFrame::OnNewWindow)
     EVT_MENU(wxID_NEW, MyFrame::OnNewWindow)

+    EVT_MENU(wxID_CLOSE, MyFrame::OnClose)

 END_EVENT_TABLE()
 
 MyFrame::MyFrame()
 END_EVENT_TABLE()
 
 MyFrame::MyFrame()

-       : wxFrame(NULL, wxID_ANY, _T("wxWidgets OpenGL Cube Sample"),
-                 wxDefaultPosition, wxSize(400, 300))
+       : wxFrame(NULL, wxID_ANY, _T("wxWidgets OpenGL Cube Sample"))

 {
 {

-    m_canvas = new TestGLCanvas(this);
+    new TestGLCanvas(this);

 
     SetIcon(wxICON(sample));
 
     // Make a menubar
 
     SetIcon(wxICON(sample));
 
     // Make a menubar

-    wxMenu *winMenu = new wxMenu;
-    winMenu->Append(wxID_EXIT, _T("&Close"));
-    winMenu->Append(wxID_NEW, _T("&New") );
+    wxMenu *menu = new wxMenu;
+    menu->Append(wxID_NEW);
+    menu->AppendSeparator();
+    menu->Append(wxID_CLOSE);

     wxMenuBar *menuBar = new wxMenuBar;
     wxMenuBar *menuBar = new wxMenuBar;

-    menuBar->Append(winMenu, _T("&Window"));
+    menuBar->Append(menu, _T("&Cube"));

 
     SetMenuBar(menuBar);
 
 
     SetMenuBar(menuBar);
 

+    CreateStatusBar();
+
+    SetClientSize(400, 400);

     Show();
 }
 
     Show();
 }
 

-void MyFrame::OnExit( wxCommandEvent& WXUNUSED(event) )
+void MyFrame::OnClose(wxCommandEvent& WXUNUSED(event))

 {
     // true is to force the frame to close
     Close(true);
 {
     // true is to force the frame to close
     Close(true);