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 void
  37 gtk_glwindow_realized_callback( GtkWidget *WXUNUSED(widget), wxGLCanvas *win )
  38 {
  39     win->GTKInitImplicitContext();
  40 }
  41 }
  42
  43 #endif // WXWIN_COMPATIBILITY_2_8
  44
  45 //-----------------------------------------------------------------------------
  46 // "map" from m_wxwindow
  47 //-----------------------------------------------------------------------------
  48
  49 extern "C" {
  50 static void
  51 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
  52 {
  53     wxPaintEvent event( win->GetId() );
  54     event.SetEventObject( win );
  55     win->HandleWindowEvent( event );
  56
  57     win->m_exposed = false;
  58     win->GetUpdateRegion().Clear();
  59 }
  60 }
  61
  62 //-----------------------------------------------------------------------------
  63 // "expose_event" of m_wxwindow
  64 //-----------------------------------------------------------------------------
  65
  66 extern "C" {
  67 static gboolean
  68 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
  69 {
  70     win->m_exposed = true;
  71
  72     win->GetUpdateRegion().Union( gdk_event->area.x,
  73                                   gdk_event->area.y,
  74                                   gdk_event->area.width,
  75                                   gdk_event->area.height );
  76     return false;
  77 }
  78 }
  79
  80 //-----------------------------------------------------------------------------
  81 // "size_allocate" of m_wxwindow
  82 //-----------------------------------------------------------------------------
  83
  84 extern "C" {
  85 static void
  86 gtk_glcanvas_size_callback(GtkWidget *WXUNUSED(widget),
  87                            GtkAllocation * WXUNUSED(alloc),
  88                            wxGLCanvas *win)
  89 {
  90     if (!win->m_hasVMT)
  91         return;
  92
  93     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
  94     event.SetEventObject( win );
  95     win->HandleWindowEvent( event );
  96 }
  97 }
  98
  99 //-----------------------------------------------------------------------------
 100 // emission hook for "parent-set"
 101 //-----------------------------------------------------------------------------
 102
 103 extern "C" {
 104 static gboolean
 105 parent_set_hook(GSignalInvocationHint*, guint, const GValue* param_values, void* data)
 106 {
 107     wxGLCanvas* win = (wxGLCanvas*)data;
 108     if (g_value_peek_pointer(&param_values[0]) == win->m_wxwindow)
 109     {
 110         const XVisualInfo* xvi = win->GetXVisualInfo();
 111         GdkVisual* visual = gtk_widget_get_visual(win->m_wxwindow);
 112         if (GDK_VISUAL_XVISUAL(visual)->visualid != xvi->visualid)
 113         {
 114             GdkScreen* screen = gtk_widget_get_screen(win->m_wxwindow);
 115             visual = gdk_x11_screen_lookup_visual(screen, xvi->visualid);
 116             GdkColormap* colormap = gdk_colormap_new(visual, false);
 117             gtk_widget_set_colormap(win->m_wxwindow, colormap);
 118             g_object_unref(colormap);
 119         }
 120         // remove hook
 121         return false;
 122     }
 123     return true;
 124 }
 125 }
 126
 127 //---------------------------------------------------------------------------
 128 // wxGlCanvas
 129 //---------------------------------------------------------------------------
 130
 131 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 132
 133 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 134                        wxWindowID id,
 135                        const int *attribList,
 136                        const wxPoint& pos,
 137                        const wxSize& size,
 138                        long style,
 139                        const wxString& name,
 140                        const wxPalette& palette)
 141 #if WXWIN_COMPATIBILITY_2_8
 142     : m_createImplicitContext(false)
 143 #endif
 144 {
 145     Create(parent, id, pos, size, style, name, attribList, palette);
 146 }
 147
 148 #if WXWIN_COMPATIBILITY_2_8
 149
 150 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 151                        wxWindowID id,
 152                        const wxPoint& pos,
 153                        const wxSize& size,
 154                        long style,
 155                        const wxString& name,
 156                        const int *attribList,
 157                        const wxPalette& palette)
 158     : m_createImplicitContext(true)
 159 {
 160     m_sharedContext = NULL;
 161     m_sharedContextOf = NULL;
 162
 163     Create(parent, id, pos, size, style, name, attribList, palette);
 164 }
 165
 166 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 167                        const wxGLContext *shared,
 168                        wxWindowID id,
 169                        const wxPoint& pos,
 170                        const wxSize& size,
 171                        long style,
 172                        const wxString& name,
 173                        const int *attribList,
 174                        const wxPalette& palette)
 175     : m_createImplicitContext(true)
 176 {
 177     m_sharedContext = const_cast<wxGLContext *>(shared);
 178
 179     Create(parent, id, pos, size, style, name, attribList, palette);
 180 }
 181
 182 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 183                        const wxGLCanvas *shared,
 184                        wxWindowID id,
 185                        const wxPoint& pos, const wxSize& size,
 186                        long style, const wxString& name,
 187                        const int *attribList,
 188                        const wxPalette& palette )
 189     : m_createImplicitContext(true)
 190 {
 191     m_sharedContext = NULL;
 192     m_sharedContextOf = const_cast<wxGLCanvas *>(shared);
 193
 194     Create(parent, id, pos, size, style, name, attribList, palette);
 195 }
 196
 197 #endif // WXWIN_COMPATIBILITY_2_8
 198
 199 bool wxGLCanvas::Create(wxWindow *parent,
 200                         wxWindowID id,
 201                         const wxPoint& pos,
 202                         const wxSize& size,
 203                         long style,
 204                         const wxString& name,
 205                         const int *attribList,
 206                         const wxPalette& WXUNUSED_UNLESS_DEBUG(palette))
 207 {
 208     wxASSERT_MSG( !palette.IsOk(), wxT("palettes not supported") );
 209
 210     m_exposed = false;
 211     m_noExpose = true;
 212     m_nativeSizeEvent = true;
 213
 214     if ( !InitVisual(attribList) )
 215         return false;
 216
 217     // watch for the "parent-set" signal on m_wxwindow so we can set colormap
 218     // before m_wxwindow is realized (which will occur before
 219     // wxWindow::Create() returns if parent is already visible)
 220     unsigned sig_id = g_signal_lookup("parent-set", GTK_TYPE_WIDGET);
 221     g_signal_add_emission_hook(sig_id, 0, parent_set_hook, this, NULL);
 222
 223     wxWindow::Create( parent, id, pos, size, style, name );
 224
 225     gtk_widget_set_double_buffered(m_wxwindow, false);
 226
 227 #if WXWIN_COMPATIBILITY_2_8
 228     g_signal_connect(m_wxwindow, "realize",       G_CALLBACK(gtk_glwindow_realized_callback), this);
 229 #endif // WXWIN_COMPATIBILITY_2_8
 230     g_signal_connect(m_wxwindow, "map",           G_CALLBACK(gtk_glwindow_map_callback),      this);
 231     g_signal_connect(m_wxwindow, "expose_event",  G_CALLBACK(gtk_glwindow_expose_callback),   this);
 232     g_signal_connect(m_widget,   "size_allocate", G_CALLBACK(gtk_glcanvas_size_callback),     this);
 233
 234 #if WXWIN_COMPATIBILITY_2_8
 235     // if our parent window is already visible, we had been realized before we
 236     // connected to the "realize" signal and hence our m_glContext hasn't been
 237     // initialized yet and we have to do it now
 238     if (GTK_WIDGET_REALIZED(m_wxwindow))
 239         gtk_glwindow_realized_callback( m_wxwindow, this );
 240 #endif // WXWIN_COMPATIBILITY_2_8
 241
 242     if (GTK_WIDGET_MAPPED(m_wxwindow))
 243         gtk_glwindow_map_callback( m_wxwindow, this );
 244
 245     return true;
 246 }
 247
 248 Window wxGLCanvas::GetXWindow() const
 249 {
 250     GdkWindow *window = m_wxwindow->window;
 251     return window ? GDK_WINDOW_XWINDOW(window) : 0;
 252 }
 253
 254 void wxGLCanvas::OnInternalIdle()
 255 {
 256     if (m_exposed)
 257     {
 258         wxPaintEvent event( GetId() );
 259         event.SetEventObject( this );
 260         HandleWindowEvent( event );
 261
 262         m_exposed = false;
 263         GetUpdateRegion().Clear();
 264     }
 265
 266     wxWindow::OnInternalIdle();
 267 }
 268
 269 #if WXWIN_COMPATIBILITY_2_8
 270
 271 void wxGLCanvas::GTKInitImplicitContext()
 272 {
 273     if ( !m_glContext && m_createImplicitContext )
 274     {
 275         wxGLContext *share = m_sharedContext;
 276         if ( !share && m_sharedContextOf )
 277             share = m_sharedContextOf->m_glContext;
 278
 279         m_glContext = new wxGLContext(this, share);
 280     }
 281 }
 282
 283 #endif // WXWIN_COMPATIBILITY_2_8
 284
 285 #endif // wxUSE_GLCANVAS