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 #include "wx/gtk/win_gtk.h"
  30
  31 #if WXWIN_COMPATIBILITY_2_8
  32
  33 //-----------------------------------------------------------------------------
  34 // "realize" from m_wxwindow: used to create m_glContext implicitly
  35 //-----------------------------------------------------------------------------
  36
  37 extern "C" {
  38 static gint
  39 gtk_glwindow_realized_callback( GtkWidget *WXUNUSED(widget), wxGLCanvas *win )
  40 {
  41     win->GTKInitImplicitContext();
  42
  43     return FALSE;
  44 }
  45 }
  46
  47 #endif // WXWIN_COMPATIBILITY_2_8
  48
  49 //-----------------------------------------------------------------------------
  50 // "map" from m_wxwindow
  51 //-----------------------------------------------------------------------------
  52
  53 extern "C" {
  54 static gint
  55 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
  56 {
  57     wxPaintEvent event( win->GetId() );
  58     event.SetEventObject( win );
  59     win->GetEventHandler()->ProcessEvent( event );
  60
  61     win->m_exposed = false;
  62     win->GetUpdateRegion().Clear();
  63
  64     return FALSE;
  65 }
  66 }
  67
  68 //-----------------------------------------------------------------------------
  69 // "expose_event" of m_wxwindow
  70 //-----------------------------------------------------------------------------
  71
  72 extern "C" {
  73 static gboolean
  74 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
  75 {
  76     win->m_exposed = true;
  77
  78     win->GetUpdateRegion().Union( gdk_event->area.x,
  79                                   gdk_event->area.y,
  80                                   gdk_event->area.width,
  81                                   gdk_event->area.height );
  82     return false;
  83 }
  84 }
  85
  86 //-----------------------------------------------------------------------------
  87 // "size_allocate" of m_wxwindow
  88 //-----------------------------------------------------------------------------
  89
  90 extern "C" {
  91 static void
  92 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, 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& palette)
 179 {
 180     m_exposed = false;
 181     m_noExpose = true;
 182     m_nativeSizeEvent = true;
 183
 184     if ( !InitVisual(attribList) )
 185         return false;
 186
 187     XVisualInfo * const xvi = GetXVisualInfo();
 188
 189     GdkVisual *visual;
 190     GdkColormap *colormap;
 191
 192     // MR: This needs a fix for lower gtk+ versions too. Might need to rethink logic (FIXME)
 193 #if defined(__WXGTK20__) && GTK_CHECK_VERSION(2,2,0)
 194     if (!gtk_check_version(2,2,0))
 195     {
 196         wxWindow::Create( parent, id, pos, size, style, name );
 197
 198         m_glWidget = m_wxwindow;
 199
 200         GdkScreen *screen = gtk_widget_get_screen( m_glWidget );
 201         colormap = gdk_screen_get_default_colormap(screen);
 202         visual = gdk_colormap_get_visual(colormap);
 203
 204         if (GDK_VISUAL_XVISUAL(visual)->visualid != xvi->visualid)
 205         {
 206             visual = gdk_x11_screen_lookup_visual( screen, xvi->visualid );
 207             colormap = gdk_colormap_new(visual, FALSE);
 208         }
 209
 210         gtk_widget_set_colormap( m_glWidget, colormap );
 211     }
 212     else
 213 #endif // GTK+ >= 2.2
 214     {
 215         visual = gdkx_visual_get( xvi->visualid );
 216         colormap = gdk_colormap_new( visual, TRUE );
 217
 218         gtk_widget_push_colormap( colormap );
 219
 220         wxWindow::Create( parent, id, pos, size, style, name );
 221         m_glWidget = m_wxwindow;
 222     }
 223
 224     gtk_widget_set_double_buffered( m_glWidget, FALSE );
 225
 226 #if WXWIN_COMPATIBILITY_2_8
 227     g_signal_connect(m_wxwindow, "realize",       G_CALLBACK(gtk_glwindow_realized_callback), this);
 228 #endif // WXWIN_COMPATIBILITY_2_8
 229     g_signal_connect(m_wxwindow, "map",           G_CALLBACK(gtk_glwindow_map_callback),      this);
 230     g_signal_connect(m_wxwindow, "expose_event",  G_CALLBACK(gtk_glwindow_expose_callback),   this);
 231     g_signal_connect(m_widget,   "size_allocate", G_CALLBACK(gtk_glcanvas_size_callback),     this);
 232
 233     if (gtk_check_version(2,2,0) != NULL)
 234     {
 235         gtk_widget_pop_colormap();
 236     }
 237
 238 #if WXWIN_COMPATIBILITY_2_8
 239     // if our parent window is already visible, we had been realized before we
 240     // connected to the "realize" signal and hence our m_glContext hasn't been
 241     // initialized yet and we have to do it now
 242     if (GTK_WIDGET_REALIZED(m_wxwindow))
 243         gtk_glwindow_realized_callback( m_wxwindow, this );
 244 #endif // WXWIN_COMPATIBILITY_2_8
 245
 246     if (GTK_WIDGET_MAPPED(m_wxwindow))
 247         gtk_glwindow_map_callback( m_wxwindow, this );
 248
 249     return true;
 250 }
 251
 252 Window wxGLCanvas::GetXWindow() const
 253 {
 254     GdkWindow *window = GTK_PIZZA(m_wxwindow)->bin_window;
 255     return window ? GDK_WINDOW_XWINDOW(window) : 0;
 256 }
 257
 258 void wxGLCanvas::OnInternalIdle()
 259 {
 260     if (m_exposed)
 261     {
 262         wxPaintEvent event( GetId() );
 263         event.SetEventObject( this );
 264         GetEventHandler()->ProcessEvent( event );
 265
 266         m_exposed = false;
 267         GetUpdateRegion().Clear();
 268     }
 269
 270     wxWindow::OnInternalIdle();
 271 }
 272
 273 #if WXWIN_COMPATIBILITY_2_8
 274
 275 void wxGLCanvas::GTKInitImplicitContext()
 276 {
 277     if ( !m_glContext && m_createImplicitContext )
 278     {
 279         wxGLContext *share = m_sharedContext;
 280         if ( !share && m_sharedContextOf )
 281             share = m_sharedContextOf->m_glContext;
 282
 283         m_glContext = new wxGLContext(this, share);
 284     }
 285 }
 286
 287 #endif // WXWIN_COMPATIBILITY_2_8
 288
 289 #endif // wxUSE_GLCANVAS