utils/glcanvas/gtk/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        glcanvas.cpp
   3 // Purpose:     wxGLCanvas, for using OpenGL/Mesa with wxWindows 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 #ifdef __GNUG__
  13 #pragma implementation "glcanvas.h"
  14 #endif
  15
  16 #include "glcanvas.h"
  17
  18 #include "wx/frame.h"
  19 #include "wx/colour.h"
  20 #include "wx/module.h"
  21 #include "wx/app.h"
  22
  23 extern "C" {
  24 #include "gtk/gtk.h"
  25 #include "gdk/gdk.h"
  26 #include "gdk/gdkx.h"
  27 }
  28
  29 #include "wx/gtk/win_gtk.h"
  30
  31 //---------------------------------------------------------------------------
  32 // global data
  33 //---------------------------------------------------------------------------
  34
  35 XVisualInfo *g_vi = (XVisualInfo*) NULL;
  36
  37 //---------------------------------------------------------------------------
  38 // wxGLContext
  39 //---------------------------------------------------------------------------
  40
  41 IMPLEMENT_CLASS(wxGLContext,wxObject)
  42
  43 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
  44 {
  45     m_window = win;
  46     m_widget = ((wxGLCanvas*)win)->m_glWidget;
  47
  48     wxCHECK_RET( g_vi, "invalid visual for OpenGl" );
  49
  50     m_glContext = glXCreateContext( GDK_DISPLAY(), g_vi, None, GL_TRUE );
  51
  52     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  53 }
  54
  55 wxGLContext::wxGLContext(
  56                bool WXUNUSED(isRGB), wxWindow *win,
  57                const wxPalette& WXUNUSED(palette),
  58                const wxGLContext *other        /* for sharing display lists */
  59 )
  60 {
  61     m_window = win;
  62     m_widget = ((wxGLCanvas*)win)->m_glWidget;
  63
  64     wxCHECK_RET( g_vi, "invalid visual for OpenGl" );
  65
  66     if( other != 0 )
  67       m_glContext = glXCreateContext( GDK_DISPLAY(), g_vi, other->m_glContext,
  68                                       GL_TRUE );
  69     else
  70       m_glContext = glXCreateContext( GDK_DISPLAY(), g_vi, None, GL_TRUE );
  71
  72     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  73 }
  74
  75 wxGLContext::~wxGLContext()
  76 {
  77     if (!m_glContext) return;
  78
  79     if (m_glContext == glXGetCurrentContext())
  80     {
  81         glXMakeCurrent( GDK_DISPLAY(), None, NULL);
  82     }
  83
  84     glXDestroyContext( GDK_DISPLAY(), m_glContext );
  85 }
  86
  87 void wxGLContext::SwapBuffers()
  88 {
  89     if (m_glContext)
  90     {
  91         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( m_widget->window ) );
  92     }
  93 }
  94
  95 void wxGLContext::SetCurrent()
  96 {
  97     if (m_glContext)
  98     {
  99         glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(m_widget->window), m_glContext );
 100     }
 101 }
 102
 103 void wxGLContext::SetColour(const char *colour)
 104 {
 105     float r = 0.0;
 106     float g = 0.0;
 107     float b = 0.0;
 108     wxColour *col = wxTheColourDatabase->FindColour(colour);
 109     if (col)
 110     {
 111         r = (float)(col->Red()/256.0);
 112         g = (float)(col->Green()/256.0);
 113         b = (float)(col->Blue()/256.0);
 114         glColor3f( r, g, b);
 115     }
 116 }
 117
 118 void wxGLContext::SetupPixelFormat()
 119 {
 120 }
 121
 122 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 123 {
 124 }
 125
 126 wxPalette wxGLContext::CreateDefaultPalette()
 127 {
 128     return wxNullPalette;
 129 }
 130
 131 //-----------------------------------------------------------------------------
 132 // "expose_event" of m_glWidget
 133 //-----------------------------------------------------------------------------
 134
 135 static void gtk_window_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxWindow *win )
 136 {
 137     if (!win->HasVMT()) return;
 138
 139     win->m_updateRegion.Union( gdk_event->area.x,
 140                                gdk_event->area.y,
 141                                gdk_event->area.width,
 142                                gdk_event->area.height );
 143
 144     if (gdk_event->count > 0) return;
 145
 146 /*
 147     printf( "OnExpose from " );
 148     if (win->GetClassInfo() && win->GetClassInfo()->GetClassName())
 149         printf( win->GetClassInfo()->GetClassName() );
 150     printf( ".\n" );
 151 */
 152
 153     wxPaintEvent event( win->GetId() );
 154     event.SetEventObject( win );
 155     win->GetEventHandler()->ProcessEvent( event );
 156
 157     win->m_updateRegion.Clear();
 158 }
 159
 160 //-----------------------------------------------------------------------------
 161 // "draw" of m_glWidget
 162 //-----------------------------------------------------------------------------
 163
 164 static void gtk_window_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxWindow *win )
 165 {
 166     if (!win->HasVMT()) return;
 167
 168     win->m_updateRegion.Union( rect->x, rect->y, rect->width, rect->height );
 169
 170     wxPaintEvent event( win->GetId() );
 171     event.SetEventObject( win );
 172     win->GetEventHandler()->ProcessEvent( event );
 173
 174     win->m_updateRegion.Clear();
 175 }
 176
 177 //---------------------------------------------------------------------------
 178 // wxGlCanvas
 179 //---------------------------------------------------------------------------
 180
 181 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 182
 183 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 184     EVT_SIZE(wxGLCanvas::OnSize)
 185 END_EVENT_TABLE()
 186
 187 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 188                         const wxPoint& pos, const wxSize& size,
 189                         long style, const wxString& name,
 190                         int *attribList,
 191                         const wxPalette& palette )
 192 {
 193     Create( parent, NULL, id, pos, size, style, name, attribList, palette );
 194 }
 195
 196 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 197                         const wxGLContext *shared,
 198                         wxWindowID id,
 199                         const wxPoint& pos, const wxSize& size,
 200                         long style, const wxString& name,
 201                         int *attribList,
 202                         const wxPalette& palette )
 203 {
 204     Create( parent, shared, id, pos, size, style, name, attribList, palette );
 205 }
 206
 207 bool wxGLCanvas::Create( wxWindow *parent,
 208                          const wxGLContext *shared,
 209                          wxWindowID id,
 210                          const wxPoint& pos, const wxSize& size,
 211                          long style, const wxString& name,
 212                          int *attribList,
 213                          const wxPalette& palette)
 214 {
 215     if (!attribList)
 216     {
 217         int data[] = { GLX_RGBA,
 218                        GLX_DOUBLEBUFFER,
 219                        GLX_DEPTH_SIZE, 1,  /* use largest available depth buffer */
 220                        None };
 221         attribList = (int*) data;
 222         printf( "using default values\n" );
 223     }
 224     else
 225     {
 226       int data[512], arg=0, p=0;
 227
 228       while( (attribList[arg]!=0) && (p<512) )
 229       {
 230         switch( attribList[arg++] )
 231         {
 232           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 233           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 234           case WX_GL_DEPTH_SIZE:
 235             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 236           case WX_GL_MIN_RED:
 237             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 238           case WX_GL_MIN_GREEN:
 239             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 240           case WX_GL_MIN_BLUE:
 241             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 242           default:
 243             break;
 244         }
 245       }
 246       data[p] = 0;
 247
 248       attribList = (int*) data;
 249     }
 250
 251     Display *dpy = GDK_DISPLAY();
 252
 253     g_vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 254
 255     GdkVisual *visual = gdkx_visual_get( g_vi->visualid );
 256     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(g_vi->visualid), TRUE );
 257
 258     gtk_widget_push_colormap( colormap );
 259     gtk_widget_push_visual( visual );
 260
 261     m_glWidget = gtk_myfixed_new();
 262
 263     gtk_widget_pop_visual();
 264     gtk_widget_pop_colormap();
 265
 266     wxScrolledWindow::Create( parent, id, pos, size, style, name );
 267
 268     GTK_WIDGET_UNSET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 269     GTK_WIDGET_SET_FLAGS( m_glWidget, GTK_CAN_FOCUS );
 270
 271     gtk_myfixed_put( GTK_MYFIXED(m_wxwindow), m_glWidget, 0, 0, m_width, m_height );
 272
 273     gtk_signal_connect( GTK_OBJECT(m_glWidget), "expose_event",
 274       GTK_SIGNAL_FUNC(gtk_window_expose_callback), (gpointer)this );
 275
 276     gtk_signal_connect( GTK_OBJECT(m_glWidget), "draw",
 277       GTK_SIGNAL_FUNC(gtk_window_draw_callback), (gpointer)this );
 278
 279     /* connect to key press and mouse handlers etc. */
 280     ConnectWidget( m_glWidget );
 281
 282
 283     /* must be realized for OpenGl output */
 284     gtk_widget_realize( m_glWidget );
 285
 286     gtk_widget_show( m_glWidget );
 287
 288     m_glContext = new wxGLContext( TRUE, this, palette, shared );
 289
 290     XFree( g_vi );
 291     g_vi = (XVisualInfo*) NULL;
 292
 293     gdk_window_set_back_pixmap( m_glWidget->window, None, 0 );
 294
 295     return TRUE;
 296 }
 297
 298 wxGLCanvas::~wxGLCanvas()
 299 {
 300     if (m_glContext) delete m_glContext;
 301 }
 302
 303 void wxGLCanvas::SwapBuffers()
 304 {
 305     if (m_glContext) m_glContext->SwapBuffers();
 306 }
 307
 308 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 309 {
 310     int width, height;
 311     GetClientSize( &width, &height );
 312     if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
 313     {
 314         SetCurrent();
 315 //        gdk_window_set_back_pixmap( gtk_widget_get_parent_window(m_glWidget), None, 0 );
 316
 317         glViewport(0, 0, (GLint)width, (GLint)height );
 318         glMatrixMode(GL_PROJECTION);
 319         glLoadIdentity();
 320         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 321         glMatrixMode(GL_MODELVIEW);
 322     }
 323 }
 324
 325 void wxGLCanvas::SetCurrent()
 326 {
 327     if (m_glContext) m_glContext->SetCurrent();
 328 }
 329
 330 void wxGLCanvas::SetColour( const char *colour )
 331 {
 332     if (m_glContext) m_glContext->SetColour( colour );
 333 }
 334
 335 void wxGLCanvas::DoSetSize( int x, int y, int width, int height, int sizeFlags )
 336 {
 337     if (m_resizing) return; // I don't like recursions
 338     m_resizing = TRUE;
 339
 340     if (m_parent->m_wxwindow == NULL) // i.e. wxNotebook
 341     {
 342         // don't set the size for children of wxNotebook, just take the values.
 343         m_x = x;
 344         m_y = y;
 345         m_width = width;
 346         m_height = height;
 347     }
 348     else
 349     {
 350         int old_width = m_width;
 351         int old_height = m_height;
 352
 353         if ((sizeFlags & wxSIZE_USE_EXISTING) == wxSIZE_USE_EXISTING)
 354         {
 355             if (x != -1) m_x = x;
 356             if (y != -1) m_y = y;
 357             if (width != -1) m_width = width;
 358             if (height != -1) m_height = height;
 359         }
 360         else
 361         {
 362             m_x = x;
 363             m_y = y;
 364             m_width = width;
 365             m_height = height;
 366         }
 367
 368         if ((sizeFlags & wxSIZE_AUTO_WIDTH) == wxSIZE_AUTO_WIDTH)
 369         {
 370              if (width == -1) m_width = 80;
 371         }
 372
 373         if ((sizeFlags & wxSIZE_AUTO_HEIGHT) == wxSIZE_AUTO_HEIGHT)
 374         {
 375              if (height == -1) m_height = 26;
 376         }
 377
 378         if ((m_minWidth != -1) && (m_width < m_minWidth)) m_width = m_minWidth;
 379         if ((m_minHeight != -1) && (m_height < m_minHeight)) m_height = m_minHeight;
 380         if ((m_maxWidth != -1) && (m_width > m_maxWidth)) m_width = m_maxWidth;
 381         if ((m_maxHeight != -1) && (m_height > m_maxHeight)) m_height = m_maxHeight;
 382
 383         gtk_myfixed_set_size( GTK_MYFIXED(m_parent->m_wxwindow),
 384                               m_widget,
 385                               m_x,
 386                               m_y,
 387                               m_width,
 388                               m_height );
 389
 390         gtk_myfixed_set_size( GTK_MYFIXED(m_wxwindow),
 391                               m_glWidget,
 392                               m_x,
 393                               m_y,
 394                               m_width,
 395                               m_height );
 396     }
 397
 398     m_sizeSet = TRUE;
 399
 400     wxSizeEvent event( wxSize(m_width,m_height), GetId() );
 401     event.SetEventObject( this );
 402     GetEventHandler()->ProcessEvent( event );
 403
 404     m_resizing = FALSE;
 405 }
 406
 407 GtkWidget *wxGLCanvas::GetConnectWidget()
 408 {
 409     return m_glWidget;
 410 }
 411
 412 bool wxGLCanvas::IsOwnGtkWindow( GdkWindow *window )
 413 {
 414     return (window == m_glWidget->window);
 415 }