src/gtk/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/glcanvas.cpp
   3 // Purpose:     wxGLCanvas, for using OpenGL/Mesa with wxWidgets and GTK
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     17/08/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #if wxUSE_GLCANVAS
  16
  17 #include "wx/glcanvas.h"
  18
  19 #ifndef WX_PRECOMP
  20     #include "wx/app.h"
  21     #include "wx/frame.h"
  22     #include "wx/colour.h"
  23     #include "wx/module.h"
  24 #endif // WX_PRECOMP
  25
  26 #include <gtk/gtk.h>
  27 #include <gdk/gdkx.h>
  28
  29 #if WXWIN_COMPATIBILITY_2_8
  30
  31 //-----------------------------------------------------------------------------
  32 // "realize" from m_wxwindow: used to create m_glContext implicitly
  33 //-----------------------------------------------------------------------------
  34
  35 extern "C" {
  36 static gint
  37 gtk_glwindow_realized_callback( GtkWidget *WXUNUSED(widget), wxGLCanvas *win )
  38 {
  39     win->GTKInitImplicitContext();
  40
  41     return FALSE;
  42 }
  43 }
  44
  45 #endif // WXWIN_COMPATIBILITY_2_8
  46
  47 //-----------------------------------------------------------------------------
  48 // "map" from m_wxwindow
  49 //-----------------------------------------------------------------------------
  50
  51 extern "C" {
  52 static gint
  53 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
  54 {
  55     wxPaintEvent event( win->GetId() );
  56     event.SetEventObject( win );
  57     win->GetEventHandler()->ProcessEvent( event );
  58
  59     win->m_exposed = false;
  60     win->GetUpdateRegion().Clear();
  61
  62     return FALSE;
  63 }
  64 }
  65
  66 //-----------------------------------------------------------------------------
  67 // "expose_event" of m_wxwindow
  68 //-----------------------------------------------------------------------------
  69
  70 extern "C" {
  71 static gboolean
  72 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
  73 {
  74     win->m_exposed = true;
  75
  76     win->GetUpdateRegion().Union( gdk_event->area.x,
  77                                   gdk_event->area.y,
  78                                   gdk_event->area.width,
  79                                   gdk_event->area.height );
  80     return false;
  81 }
  82 }
  83
  84 //-----------------------------------------------------------------------------
  85 // "size_allocate" of m_wxwindow
  86 //-----------------------------------------------------------------------------
  87
  88 extern "C" {
  89 static void
  90 gtk_glcanvas_size_callback(GtkWidget *WXUNUSED(widget),
  91                            GtkAllocation * WXUNUSED(alloc),
  92                            wxGLCanvas *win)
  93 {
  94     if (!win->m_hasVMT)
  95         return;
  96
  97     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
  98     event.SetEventObject( win );
  99     win->GetEventHandler()->ProcessEvent( event );
 100 }
 101 }
 102
 103 //---------------------------------------------------------------------------
 104 // wxGlCanvas
 105 //---------------------------------------------------------------------------
 106
 107 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 108
 109 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 110                        wxWindowID id,
 111                        const int *attribList,
 112                        const wxPoint& pos,
 113                        const wxSize& size,
 114                        long style,
 115                        const wxString& name,
 116                        const wxPalette& palette)
 117 #if WXWIN_COMPATIBILITY_2_8
 118     : m_createImplicitContext(false)
 119 #endif
 120 {
 121     Create(parent, id, pos, size, style, name, attribList, palette);
 122 }
 123
 124 #if WXWIN_COMPATIBILITY_2_8
 125
 126 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 127                        wxWindowID id,
 128                        const wxPoint& pos,
 129                        const wxSize& size,
 130                        long style,
 131                        const wxString& name,
 132                        const int *attribList,
 133                        const wxPalette& palette)
 134     : m_createImplicitContext(true)
 135 {
 136     Create(parent, id, pos, size, style, name, attribList, palette);
 137 }
 138
 139 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 140                        const wxGLContext *shared,
 141                        wxWindowID id,
 142                        const wxPoint& pos,
 143                        const wxSize& size,
 144                        long style,
 145                        const wxString& name,
 146                        const int *attribList,
 147                        const wxPalette& palette)
 148     : m_createImplicitContext(true)
 149 {
 150     m_sharedContext = wx_const_cast(wxGLContext *, shared);
 151
 152     Create(parent, id, pos, size, style, name, attribList, palette);
 153 }
 154
 155 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 156                        const wxGLCanvas *shared,
 157                        wxWindowID id,
 158                        const wxPoint& pos, const wxSize& size,
 159                        long style, const wxString& name,
 160                        const int *attribList,
 161                        const wxPalette& palette )
 162     : m_createImplicitContext(true)
 163 {
 164     m_sharedContextOf = wx_const_cast(wxGLCanvas *, shared);
 165
 166     Create(parent, id, pos, size, style, name, attribList, palette);
 167 }
 168
 169 #endif // WXWIN_COMPATIBILITY_2_8
 170
 171 bool wxGLCanvas::Create(wxWindow *parent,
 172                         wxWindowID id,
 173                         const wxPoint& pos,
 174                         const wxSize& size,
 175                         long style,
 176                         const wxString& name,
 177                         const int *attribList,
 178                         const wxPalette& WXUNUSED_UNLESS_DEBUG(palette))
 179 {
 180     wxASSERT_MSG( !palette.IsOk(), _T("palettes not supported") );
 181
 182     m_exposed = false;
 183     m_noExpose = true;
 184     m_nativeSizeEvent = true;
 185
 186     if ( !InitVisual(attribList) )
 187         return false;
 188
 189     XVisualInfo * const xvi = GetXVisualInfo();
 190
 191     GdkVisual *visual;
 192     GdkColormap *colormap;
 193
 194     wxWindow::Create( parent, id, pos, size, style, name );
 195
 196     m_glWidget = m_wxwindow;
 197
 198     GdkScreen *screen = gtk_widget_get_screen( m_glWidget );
 199     colormap = gdk_screen_get_default_colormap(screen);
 200     visual = gdk_colormap_get_visual(colormap);
 201
 202     if (GDK_VISUAL_XVISUAL(visual)->visualid != xvi->visualid)
 203     {
 204         visual = gdk_x11_screen_lookup_visual( screen, xvi->visualid );
 205         colormap = gdk_colormap_new(visual, FALSE);
 206     }
 207
 208     gtk_widget_set_colormap( m_glWidget, colormap );
 209
 210     gtk_widget_set_double_buffered( m_glWidget, FALSE );
 211
 212 #if WXWIN_COMPATIBILITY_2_8
 213     g_signal_connect(m_wxwindow, "realize",       G_CALLBACK(gtk_glwindow_realized_callback), this);
 214 #endif // WXWIN_COMPATIBILITY_2_8
 215     g_signal_connect(m_wxwindow, "map",           G_CALLBACK(gtk_glwindow_map_callback),      this);
 216     g_signal_connect(m_wxwindow, "expose_event",  G_CALLBACK(gtk_glwindow_expose_callback),   this);
 217     g_signal_connect(m_widget,   "size_allocate", G_CALLBACK(gtk_glcanvas_size_callback),     this);
 218
 219 #if WXWIN_COMPATIBILITY_2_8
 220     // if our parent window is already visible, we had been realized before we
 221     // connected to the "realize" signal and hence our m_glContext hasn't been
 222     // initialized yet and we have to do it now
 223     if (GTK_WIDGET_REALIZED(m_wxwindow))
 224         gtk_glwindow_realized_callback( m_wxwindow, this );
 225 #endif // WXWIN_COMPATIBILITY_2_8
 226
 227     if (GTK_WIDGET_MAPPED(m_wxwindow))
 228         gtk_glwindow_map_callback( m_wxwindow, this );
 229
 230     return true;
 231 }
 232
 233 Window wxGLCanvas::GetXWindow() const
 234 {
 235     GdkWindow *window = m_wxwindow->window;
 236     return window ? GDK_WINDOW_XWINDOW(window) : 0;
 237 }
 238
 239 void wxGLCanvas::OnInternalIdle()
 240 {
 241     if (m_exposed)
 242     {
 243         wxPaintEvent event( GetId() );
 244         event.SetEventObject( this );
 245         GetEventHandler()->ProcessEvent( event );
 246
 247         m_exposed = false;
 248         GetUpdateRegion().Clear();
 249     }
 250
 251     wxWindow::OnInternalIdle();
 252 }
 253
 254 #if WXWIN_COMPATIBILITY_2_8
 255
 256 void wxGLCanvas::GTKInitImplicitContext()
 257 {
 258     if ( !m_glContext && m_createImplicitContext )
 259     {
 260         wxGLContext *share = m_sharedContext;
 261         if ( !share && m_sharedContextOf )
 262             share = m_sharedContextOf->m_glContext;
 263
 264         m_glContext = new wxGLContext(this, share);
 265     }
 266 }
 267
 268 #endif // WXWIN_COMPATIBILITY_2_8
 269
 270 #endif // wxUSE_GLCANVAS