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 #include <gtk/gtk.h>
  20 #include <gdk/gdkx.h>
  21
  22 #if WXWIN_COMPATIBILITY_2_8
  23
  24 //-----------------------------------------------------------------------------
  25 // "realize" from m_wxwindow: used to create m_glContext implicitly
  26 //-----------------------------------------------------------------------------
  27
  28 extern "C" {
  29 static void
  30 gtk_glwindow_realized_callback( GtkWidget *WXUNUSED(widget), wxGLCanvas *win )
  31 {
  32     win->GTKInitImplicitContext();
  33 }
  34 }
  35
  36 #endif // WXWIN_COMPATIBILITY_2_8
  37
  38 //-----------------------------------------------------------------------------
  39 // "map" from m_wxwindow
  40 //-----------------------------------------------------------------------------
  41
  42 extern "C" {
  43 static void
  44 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
  45 {
  46     wxPaintEvent event( win->GetId() );
  47     event.SetEventObject( win );
  48     win->HandleWindowEvent( event );
  49
  50     win->m_exposed = false;
  51     win->GetUpdateRegion().Clear();
  52 }
  53 }
  54
  55 //-----------------------------------------------------------------------------
  56 // "expose_event" of m_wxwindow
  57 //-----------------------------------------------------------------------------
  58
  59 extern "C" {
  60 static gboolean
  61 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
  62 {
  63     win->m_exposed = true;
  64
  65     win->GetUpdateRegion().Union( gdk_event->area.x,
  66                                   gdk_event->area.y,
  67                                   gdk_event->area.width,
  68                                   gdk_event->area.height );
  69     return false;
  70 }
  71 }
  72
  73 //-----------------------------------------------------------------------------
  74 // "size_allocate" of m_wxwindow
  75 //-----------------------------------------------------------------------------
  76
  77 extern "C" {
  78 static void
  79 gtk_glcanvas_size_callback(GtkWidget *WXUNUSED(widget),
  80                            GtkAllocation * WXUNUSED(alloc),
  81                            wxGLCanvas *win)
  82 {
  83     if (!win->m_hasVMT)
  84         return;
  85
  86     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
  87     event.SetEventObject( win );
  88     win->HandleWindowEvent( event );
  89 }
  90 }
  91
  92 //-----------------------------------------------------------------------------
  93 // emission hook for "parent-set"
  94 //-----------------------------------------------------------------------------
  95
  96 extern "C" {
  97 static gboolean
  98 parent_set_hook(GSignalInvocationHint*, guint, const GValue* param_values, void* data)
  99 {
 100     wxGLCanvas* win = (wxGLCanvas*)data;
 101     if (g_value_peek_pointer(&param_values[0]) == win->m_wxwindow)
 102     {
 103         const XVisualInfo* xvi = win->GetXVisualInfo();
 104         GdkVisual* visual = gtk_widget_get_visual(win->m_wxwindow);
 105         if (GDK_VISUAL_XVISUAL(visual)->visualid != xvi->visualid)
 106         {
 107             GdkScreen* screen = gtk_widget_get_screen(win->m_wxwindow);
 108             visual = gdk_x11_screen_lookup_visual(screen, xvi->visualid);
 109             GdkColormap* colormap = gdk_colormap_new(visual, false);
 110             gtk_widget_set_colormap(win->m_wxwindow, colormap);
 111             g_object_unref(colormap);
 112         }
 113         // remove hook
 114         return false;
 115     }
 116     return true;
 117 }
 118 }
 119
 120 //---------------------------------------------------------------------------
 121 // wxGlCanvas
 122 //---------------------------------------------------------------------------
 123
 124 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 125
 126 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 127                        wxWindowID id,
 128                        const int *attribList,
 129                        const wxPoint& pos,
 130                        const wxSize& size,
 131                        long style,
 132                        const wxString& name,
 133                        const wxPalette& palette)
 134 #if WXWIN_COMPATIBILITY_2_8
 135     : m_createImplicitContext(false)
 136 #endif
 137 {
 138     Create(parent, id, pos, size, style, name, attribList, palette);
 139 }
 140
 141 #if WXWIN_COMPATIBILITY_2_8
 142
 143 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 144                        wxWindowID id,
 145                        const wxPoint& pos,
 146                        const wxSize& size,
 147                        long style,
 148                        const wxString& name,
 149                        const int *attribList,
 150                        const wxPalette& palette)
 151     : m_createImplicitContext(true)
 152 {
 153     m_sharedContext = NULL;
 154     m_sharedContextOf = NULL;
 155
 156     Create(parent, id, pos, size, style, name, attribList, palette);
 157 }
 158
 159 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 160                        const wxGLContext *shared,
 161                        wxWindowID id,
 162                        const wxPoint& pos,
 163                        const wxSize& size,
 164                        long style,
 165                        const wxString& name,
 166                        const int *attribList,
 167                        const wxPalette& palette)
 168     : m_createImplicitContext(true)
 169 {
 170     m_sharedContext = const_cast<wxGLContext *>(shared);
 171
 172     Create(parent, id, pos, size, style, name, attribList, palette);
 173 }
 174
 175 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 176                        const wxGLCanvas *shared,
 177                        wxWindowID id,
 178                        const wxPoint& pos, const wxSize& size,
 179                        long style, const wxString& name,
 180                        const int *attribList,
 181                        const wxPalette& palette )
 182     : m_createImplicitContext(true)
 183 {
 184     m_sharedContext = NULL;
 185     m_sharedContextOf = const_cast<wxGLCanvas *>(shared);
 186
 187     Create(parent, id, pos, size, style, name, attribList, palette);
 188 }
 189
 190 #endif // WXWIN_COMPATIBILITY_2_8
 191
 192 bool wxGLCanvas::Create(wxWindow *parent,
 193                         wxWindowID id,
 194                         const wxPoint& pos,
 195                         const wxSize& size,
 196                         long style,
 197                         const wxString& name,
 198                         const int *attribList,
 199                         const wxPalette& palette)
 200 {
 201 #if wxUSE_PALETTE
 202     wxASSERT_MSG( !palette.IsOk(), wxT("palettes not supported") );
 203 #endif // wxUSE_PALETTE
 204     wxUnusedVar(palette); // Unused when wxDEBUG_LEVEL==0
 205
 206     m_exposed = false;
 207     m_noExpose = true;
 208     m_nativeSizeEvent = true;
 209
 210     if ( !InitVisual(attribList) )
 211         return false;
 212
 213     // watch for the "parent-set" signal on m_wxwindow so we can set colormap
 214     // before m_wxwindow is realized (which will occur before
 215     // wxWindow::Create() returns if parent is already visible)
 216     unsigned sig_id = g_signal_lookup("parent-set", GTK_TYPE_WIDGET);
 217     g_signal_add_emission_hook(sig_id, 0, parent_set_hook, this, NULL);
 218
 219     wxWindow::Create( parent, id, pos, size, style, name );
 220
 221     gtk_widget_set_double_buffered(m_wxwindow, false);
 222
 223 #if WXWIN_COMPATIBILITY_2_8
 224     g_signal_connect(m_wxwindow, "realize",       G_CALLBACK(gtk_glwindow_realized_callback), this);
 225 #endif // WXWIN_COMPATIBILITY_2_8
 226     g_signal_connect(m_wxwindow, "map",           G_CALLBACK(gtk_glwindow_map_callback),      this);
 227     g_signal_connect(m_wxwindow, "expose_event",  G_CALLBACK(gtk_glwindow_expose_callback),   this);
 228     g_signal_connect(m_widget,   "size_allocate", G_CALLBACK(gtk_glcanvas_size_callback),     this);
 229
 230 #if WXWIN_COMPATIBILITY_2_8
 231     // if our parent window is already visible, we had been realized before we
 232     // connected to the "realize" signal and hence our m_glContext hasn't been
 233     // initialized yet and we have to do it now
 234     if (GTK_WIDGET_REALIZED(m_wxwindow))
 235         gtk_glwindow_realized_callback( m_wxwindow, this );
 236 #endif // WXWIN_COMPATIBILITY_2_8
 237
 238     if (GTK_WIDGET_MAPPED(m_wxwindow))
 239         gtk_glwindow_map_callback( m_wxwindow, this );
 240
 241     return true;
 242 }
 243
 244 Window wxGLCanvas::GetXWindow() const
 245 {
 246     GdkWindow* window = GTKGetDrawingWindow();
 247     return window ? GDK_WINDOW_XWINDOW(window) : 0;
 248 }
 249
 250 void wxGLCanvas::OnInternalIdle()
 251 {
 252     if (m_exposed)
 253     {
 254         wxPaintEvent event( GetId() );
 255         event.SetEventObject( this );
 256         HandleWindowEvent( event );
 257
 258         m_exposed = false;
 259         GetUpdateRegion().Clear();
 260     }
 261
 262     wxWindow::OnInternalIdle();
 263 }
 264
 265 #if WXWIN_COMPATIBILITY_2_8
 266
 267 void wxGLCanvas::GTKInitImplicitContext()
 268 {
 269     if ( !m_glContext && m_createImplicitContext )
 270     {
 271         wxGLContext *share = m_sharedContext;
 272         if ( !share && m_sharedContextOf )
 273             share = m_sharedContextOf->m_glContext;
 274
 275         m_glContext = new wxGLContext(this, share);
 276     }
 277 }
 278
 279 #endif // WXWIN_COMPATIBILITY_2_8
 280
 281 #endif // wxUSE_GLCANVAS