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),
  93                            GtkAllocation * WXUNUSED(alloc),
  94                            wxGLCanvas *win)
  95 {
  96     if (!win->m_hasVMT)
  97         return;
  98
  99     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 100     event.SetEventObject( win );
 101     win->GetEventHandler()->ProcessEvent( event );
 102 }
 103 }
 104
 105 //---------------------------------------------------------------------------
 106 // wxGlCanvas
 107 //---------------------------------------------------------------------------
 108
 109 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 110
 111 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 112                        wxWindowID id,
 113                        const int *attribList,
 114                        const wxPoint& pos,
 115                        const wxSize& size,
 116                        long style,
 117                        const wxString& name,
 118                        const wxPalette& palette)
 119 #if WXWIN_COMPATIBILITY_2_8
 120     : m_createImplicitContext(false)
 121 #endif
 122 {
 123     Create(parent, id, pos, size, style, name, attribList, palette);
 124 }
 125
 126 #if WXWIN_COMPATIBILITY_2_8
 127
 128 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 129                        wxWindowID id,
 130                        const wxPoint& pos,
 131                        const wxSize& size,
 132                        long style,
 133                        const wxString& name,
 134                        const int *attribList,
 135                        const wxPalette& palette)
 136     : m_createImplicitContext(true)
 137 {
 138     Create(parent, id, pos, size, style, name, attribList, palette);
 139 }
 140
 141 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 142                        const wxGLContext *shared,
 143                        wxWindowID id,
 144                        const wxPoint& pos,
 145                        const wxSize& size,
 146                        long style,
 147                        const wxString& name,
 148                        const int *attribList,
 149                        const wxPalette& palette)
 150     : m_createImplicitContext(true)
 151 {
 152     m_sharedContext = wx_const_cast(wxGLContext *, shared);
 153
 154     Create(parent, id, pos, size, style, name, attribList, palette);
 155 }
 156
 157 wxGLCanvas::wxGLCanvas(wxWindow *parent,
 158                        const wxGLCanvas *shared,
 159                        wxWindowID id,
 160                        const wxPoint& pos, const wxSize& size,
 161                        long style, const wxString& name,
 162                        const int *attribList,
 163                        const wxPalette& palette )
 164     : m_createImplicitContext(true)
 165 {
 166     m_sharedContextOf = wx_const_cast(wxGLCanvas *, shared);
 167
 168     Create(parent, id, pos, size, style, name, attribList, palette);
 169 }
 170
 171 #endif // WXWIN_COMPATIBILITY_2_8
 172
 173 bool wxGLCanvas::Create(wxWindow *parent,
 174                         wxWindowID id,
 175                         const wxPoint& pos,
 176                         const wxSize& size,
 177                         long style,
 178                         const wxString& name,
 179                         const int *attribList,
 180                         const wxPalette& WXUNUSED_UNLESS_DEBUG(palette))
 181 {
 182     wxASSERT_MSG( !palette.IsOk(), _T("palettes not supported") );
 183
 184     m_exposed = false;
 185     m_noExpose = true;
 186     m_nativeSizeEvent = true;
 187
 188     if ( !InitVisual(attribList) )
 189         return false;
 190
 191     XVisualInfo * const xvi = GetXVisualInfo();
 192
 193     GdkVisual *visual;
 194     GdkColormap *colormap;
 195
 196     // MR: This needs a fix for lower gtk+ versions too. Might need to rethink logic (FIXME)
 197 #if defined(__WXGTK20__) && GTK_CHECK_VERSION(2,2,0)
 198     if (!gtk_check_version(2,2,0))
 199     {
 200         wxWindow::Create( parent, id, pos, size, style, name );
 201
 202         m_glWidget = m_wxwindow;
 203
 204         GdkScreen *screen = gtk_widget_get_screen( m_glWidget );
 205         colormap = gdk_screen_get_default_colormap(screen);
 206         visual = gdk_colormap_get_visual(colormap);
 207
 208         if (GDK_VISUAL_XVISUAL(visual)->visualid != xvi->visualid)
 209         {
 210             visual = gdk_x11_screen_lookup_visual( screen, xvi->visualid );
 211             colormap = gdk_colormap_new(visual, FALSE);
 212         }
 213
 214         gtk_widget_set_colormap( m_glWidget, colormap );
 215     }
 216     else
 217 #endif // GTK+ >= 2.2
 218     {
 219         visual = gdkx_visual_get( xvi->visualid );
 220         colormap = gdk_colormap_new( visual, TRUE );
 221
 222         gtk_widget_push_colormap( colormap );
 223
 224         wxWindow::Create( parent, id, pos, size, style, name );
 225         m_glWidget = m_wxwindow;
 226     }
 227
 228     gtk_widget_set_double_buffered( m_glWidget, FALSE );
 229
 230 #if WXWIN_COMPATIBILITY_2_8
 231     g_signal_connect(m_wxwindow, "realize",       G_CALLBACK(gtk_glwindow_realized_callback), this);
 232 #endif // WXWIN_COMPATIBILITY_2_8
 233     g_signal_connect(m_wxwindow, "map",           G_CALLBACK(gtk_glwindow_map_callback),      this);
 234     g_signal_connect(m_wxwindow, "expose_event",  G_CALLBACK(gtk_glwindow_expose_callback),   this);
 235     g_signal_connect(m_widget,   "size_allocate", G_CALLBACK(gtk_glcanvas_size_callback),     this);
 236
 237     if (gtk_check_version(2,2,0) != NULL)
 238     {
 239         gtk_widget_pop_colormap();
 240     }
 241
 242 #if WXWIN_COMPATIBILITY_2_8
 243     // if our parent window is already visible, we had been realized before we
 244     // connected to the "realize" signal and hence our m_glContext hasn't been
 245     // initialized yet and we have to do it now
 246     if (GTK_WIDGET_REALIZED(m_wxwindow))
 247         gtk_glwindow_realized_callback( m_wxwindow, this );
 248 #endif // WXWIN_COMPATIBILITY_2_8
 249
 250     if (GTK_WIDGET_MAPPED(m_wxwindow))
 251         gtk_glwindow_map_callback( m_wxwindow, this );
 252
 253     return true;
 254 }
 255
 256 Window wxGLCanvas::GetXWindow() const
 257 {
 258     GdkWindow *window = GTK_PIZZA(m_wxwindow)->bin_window;
 259     return window ? GDK_WINDOW_XWINDOW(window) : 0;
 260 }
 261
 262 void wxGLCanvas::OnInternalIdle()
 263 {
 264     if (m_exposed)
 265     {
 266         wxPaintEvent event( GetId() );
 267         event.SetEventObject( this );
 268         GetEventHandler()->ProcessEvent( event );
 269
 270         m_exposed = false;
 271         GetUpdateRegion().Clear();
 272     }
 273
 274     wxWindow::OnInternalIdle();
 275 }
 276
 277 #if WXWIN_COMPATIBILITY_2_8
 278
 279 void wxGLCanvas::GTKInitImplicitContext()
 280 {
 281     if ( !m_glContext && m_createImplicitContext )
 282     {
 283         wxGLContext *share = m_sharedContext;
 284         if ( !share && m_sharedContextOf )
 285             share = m_sharedContextOf->m_glContext;
 286
 287         m_glContext = new wxGLContext(this, share);
 288     }
 289 }
 290
 291 #endif // WXWIN_COMPATIBILITY_2_8
 292
 293 #endif // wxUSE_GLCANVAS