src/gtk/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/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 "wx/setup.h"
  17
  18 #if wxUSE_GLCANVAS
  19
  20 #include "wx/glcanvas.h"
  21
  22 #include "wx/frame.h"
  23 #include "wx/colour.h"
  24 #include "wx/module.h"
  25 #include "wx/app.h"
  26
  27 extern "C"
  28 {
  29 #include "gtk/gtk.h"
  30 #include "gdk/gdk.h"
  31 #include "gdk/gdkx.h"
  32 }
  33
  34 #include "wx/gtk/win_gtk.h"
  35
  36 // DLL options compatibility check:
  37 #include "wx/build.h"
  38 WX_CHECK_BUILD_OPTIONS("wxGL")
  39
  40 //---------------------------------------------------------------------------
  41 // global data
  42 //---------------------------------------------------------------------------
  43
  44 XVisualInfo *g_vi = (XVisualInfo*) NULL;
  45
  46 //-----------------------------------------------------------------------------
  47 // idle system
  48 //-----------------------------------------------------------------------------
  49
  50 extern void wxapp_install_idle_handler();
  51 extern bool g_isIdle;
  52
  53 //---------------------------------------------------------------------------
  54 // wxGLContext
  55 //---------------------------------------------------------------------------
  56
  57 IMPLEMENT_CLASS(wxGLContext,wxObject)
  58
  59 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
  60 {
  61     m_window = win;
  62     m_widget = win->m_wxwindow;
  63
  64     wxGLCanvas *gc = (wxGLCanvas*) win;
  65     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  66
  67     wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
  68
  69     m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
  70
  71     wxCHECK_RET( m_glContext, _T("Couldn't create OpenGl context") );
  72 }
  73
  74 wxGLContext::wxGLContext(
  75                bool WXUNUSED(isRGB), wxWindow *win,
  76                const wxPalette& WXUNUSED(palette),
  77                const wxGLContext *other        /* for sharing display lists */
  78 )
  79 {
  80     m_window = win;
  81     m_widget = win->m_wxwindow;
  82
  83     wxGLCanvas *gc = (wxGLCanvas*) win;
  84     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  85
  86     wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
  87
  88     m_glContext = glXCreateContext( GDK_DISPLAY(), vi,
  89                                     other ? other->m_glContext : None,
  90                                     GL_TRUE );
  91
  92     if ( !m_glContext )
  93     {
  94         wxFAIL_MSG( _T("Couldn't create OpenGl context") );
  95     }
  96 }
  97
  98 wxGLContext::~wxGLContext()
  99 {
 100     if (!m_glContext) return;
 101
 102     if (m_glContext == glXGetCurrentContext())
 103     {
 104         glXMakeCurrent( GDK_DISPLAY(), None, NULL);
 105     }
 106
 107     glXDestroyContext( GDK_DISPLAY(), m_glContext );
 108 }
 109
 110 void wxGLContext::SwapBuffers()
 111 {
 112     if (m_glContext)
 113     {
 114         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 115         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
 116     }
 117 }
 118
 119 void wxGLContext::SetCurrent()
 120 {
 121     if (m_glContext)
 122     {
 123         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 124         glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
 125     }
 126 }
 127
 128 void wxGLContext::SetColour(const wxChar *colour)
 129 {
 130     float r = 0.0;
 131     float g = 0.0;
 132     float b = 0.0;
 133     wxColour *col = wxTheColourDatabase->FindColour(colour);
 134     if (col)
 135     {
 136         r = (float)(col->Red()/256.0);
 137         g = (float)(col->Green()/256.0);
 138         b = (float)(col->Blue()/256.0);
 139         glColor3f( r, g, b);
 140     }
 141 }
 142
 143 void wxGLContext::SetupPixelFormat()
 144 {
 145 }
 146
 147 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 148 {
 149 }
 150
 151 wxPalette wxGLContext::CreateDefaultPalette()
 152 {
 153     return wxNullPalette;
 154 }
 155
 156 //-----------------------------------------------------------------------------
 157 // "realize" from m_wxwindow
 158 //-----------------------------------------------------------------------------
 159
 160 static gint
 161 gtk_glwindow_realized_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 162 {
 163     wxGLContext *share= win->m_sharedContext;
 164     if (share==NULL && win->m_sharedContextOf) share=win->m_sharedContextOf->GetContext();
 165
 166     win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, share );
 167
 168     return FALSE;
 169 }
 170
 171 //-----------------------------------------------------------------------------
 172 // "map" from m_wxwindow
 173 //-----------------------------------------------------------------------------
 174
 175 static gint
 176 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 177 {
 178     if (win->m_glContext/* && win->m_exposed*/)
 179     {
 180         wxPaintEvent event( win->GetId() );
 181         event.SetEventObject( win );
 182         win->GetEventHandler()->ProcessEvent( event );
 183
 184         win->m_exposed = FALSE;
 185         win->GetUpdateRegion().Clear();
 186     }
 187
 188     return FALSE;
 189 }
 190
 191 //-----------------------------------------------------------------------------
 192 // "expose_event" of m_wxwindow
 193 //-----------------------------------------------------------------------------
 194
 195 static void
 196 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
 197 {
 198     if (g_isIdle)
 199         wxapp_install_idle_handler();
 200
 201     win->m_exposed = TRUE;
 202
 203     win->GetUpdateRegion().Union( gdk_event->area.x,
 204                                   gdk_event->area.y,
 205                                   gdk_event->area.width,
 206                                   gdk_event->area.height );
 207 }
 208
 209 //-----------------------------------------------------------------------------
 210 // "draw" of m_wxwindow
 211 //-----------------------------------------------------------------------------
 212
 213 #ifndef __WXGTK20__
 214 static void
 215 gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
 216 {
 217     if (g_isIdle)
 218         wxapp_install_idle_handler();
 219
 220     win->m_exposed = TRUE;
 221
 222     win->GetUpdateRegion().Union( rect->x, rect->y,
 223                                   rect->width, rect->height );
 224 }
 225 #endif
 226
 227 //-----------------------------------------------------------------------------
 228 // "size_allocate" of m_wxwindow
 229 //-----------------------------------------------------------------------------
 230
 231 static void
 232 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
 233 {
 234     if (g_isIdle)
 235         wxapp_install_idle_handler();
 236
 237     if (!win->m_hasVMT)
 238         return;
 239
 240     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 241     event.SetEventObject( win );
 242     win->GetEventHandler()->ProcessEvent( event );
 243 }
 244
 245 //---------------------------------------------------------------------------
 246 // wxGlCanvas
 247 //---------------------------------------------------------------------------
 248
 249 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 250
 251 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
 252     EVT_SIZE(wxGLCanvas::OnSize)
 253 END_EVENT_TABLE()
 254
 255 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 256                         const wxPoint& pos, const wxSize& size,
 257                         long style, const wxString& name,
 258                         int *attribList,
 259                         const wxPalette& palette )
 260 {
 261     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 262 }
 263
 264 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 265                         const wxGLContext *shared,
 266                         wxWindowID id,
 267                         const wxPoint& pos, const wxSize& size,
 268                         long style, const wxString& name,
 269                         int *attribList,
 270                         const wxPalette& palette )
 271 {
 272     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 273 }
 274
 275 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 276                         const wxGLCanvas *shared,
 277                         wxWindowID id,
 278                         const wxPoint& pos, const wxSize& size,
 279                         long style, const wxString& name,
 280                         int *attribList,
 281                         const wxPalette& palette )
 282 {
 283     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 284 }
 285
 286 bool wxGLCanvas::Create( wxWindow *parent,
 287                          const wxGLContext *shared,
 288                          const wxGLCanvas *shared_context_of,
 289                          wxWindowID id,
 290                          const wxPoint& pos, const wxSize& size,
 291                          long style, const wxString& name,
 292                          int *attribList,
 293                          const wxPalette& palette)
 294 {
 295     m_sharedContext = (wxGLContext*)shared;  // const_cast
 296     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 297     m_glContext = (wxGLContext*) NULL;
 298
 299     m_exposed = FALSE;
 300     m_noExpose = TRUE;
 301     m_nativeSizeEvent = TRUE;
 302
 303     XVisualInfo *vi = NULL;
 304     if (wxTheApp->m_glVisualInfo != NULL)
 305     {
 306         vi = (XVisualInfo *) wxTheApp->m_glVisualInfo;
 307         m_canFreeVi = FALSE; // owned by wxTheApp - don't free upon destruction
 308     }
 309     else
 310     {
 311         vi = (XVisualInfo *) ChooseGLVisual(attribList);
 312         m_canFreeVi = TRUE;
 313     }
 314     m_vi = vi;  // save for later use
 315
 316     wxCHECK_MSG( m_vi, FALSE, _T("required visual couldn't be found") );
 317
 318     GdkVisual *visual = gdkx_visual_get( vi->visualid );
 319     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(vi->visualid), TRUE );
 320
 321     gtk_widget_push_colormap( colormap );
 322     gtk_widget_push_visual( visual );
 323
 324     wxWindow::Create( parent, id, pos, size, style, name );
 325
 326     m_glWidget = m_wxwindow;
 327
 328 #ifdef __WXGTK20__
 329     gtk_widget_set_double_buffered( m_glWidget, FALSE );
 330 #endif
 331
 332     gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );
 333
 334     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
 335                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 336
 337     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "map",
 338                             GTK_SIGNAL_FUNC(gtk_glwindow_map_callback), (gpointer) this );
 339
 340     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
 341         GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
 342
 343 #ifndef __WXGTK20__
 344     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
 345         GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
 346 #endif
 347
 348     gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
 349         GTK_SIGNAL_FUNC(gtk_glcanvas_size_callback), (gpointer)this );
 350
 351     gtk_widget_pop_visual();
 352     gtk_widget_pop_colormap();
 353
 354     if (GTK_WIDGET_REALIZED(m_wxwindow))
 355         gtk_glwindow_realized_callback( m_wxwindow, this );
 356
 357     if (GTK_WIDGET_MAPPED(m_wxwindow))
 358         gtk_glwindow_map_callback( m_wxwindow, this );
 359
 360     return TRUE;
 361 }
 362
 363 wxGLCanvas::~wxGLCanvas()
 364 {
 365     XVisualInfo *vi = (XVisualInfo *) m_vi;
 366
 367     if (vi && m_canFreeVi) XFree( vi );
 368     if (m_glContext) delete m_glContext;
 369 }
 370
 371 void* wxGLCanvas::ChooseGLVisual(int *attribList)
 372 {
 373     int data[512];
 374     if (!attribList)
 375     {
 376         // default settings if attriblist = 0
 377         data[0] = GLX_RGBA;
 378         data[1] = GLX_DOUBLEBUFFER;
 379         data[2] = GLX_DEPTH_SIZE;   data[3] = 1;
 380         data[4] = GLX_RED_SIZE;     data[5] = 1;
 381         data[6] = GLX_GREEN_SIZE;   data[7] = 1;
 382         data[8] = GLX_BLUE_SIZE;    data[9] = 1;
 383         data[10] = GLX_ALPHA_SIZE;  data[11] = 0;
 384         data[12] = None;
 385
 386         attribList = (int*) data;
 387     }
 388     else
 389     {
 390       int arg=0, p=0;
 391
 392       while( (attribList[arg]!=0) && (p<510) )
 393       {
 394         switch( attribList[arg++] )
 395         {
 396           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 397           case WX_GL_BUFFER_SIZE:
 398             data[p++]=GLX_BUFFER_SIZE; data[p++]=attribList[arg++]; break;
 399           case WX_GL_LEVEL:
 400             data[p++]=GLX_LEVEL; data[p++]=attribList[arg++]; break;
 401           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 402           case WX_GL_STEREO: data[p++] = GLX_STEREO; break;
 403           case WX_GL_AUX_BUFFERS:
 404             data[p++]=GLX_AUX_BUFFERS; data[p++]=attribList[arg++]; break;
 405           case WX_GL_MIN_RED:
 406             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 407           case WX_GL_MIN_GREEN:
 408             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 409           case WX_GL_MIN_BLUE:
 410             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 411           case WX_GL_MIN_ALPHA:
 412             data[p++]=GLX_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 413           case WX_GL_DEPTH_SIZE:
 414             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 415           case WX_GL_STENCIL_SIZE:
 416             data[p++]=GLX_STENCIL_SIZE; data[p++]=attribList[arg++]; break;
 417           case WX_GL_MIN_ACCUM_RED:
 418             data[p++]=GLX_ACCUM_RED_SIZE; data[p++]=attribList[arg++]; break;
 419           case WX_GL_MIN_ACCUM_GREEN:
 420             data[p++]=GLX_ACCUM_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 421           case WX_GL_MIN_ACCUM_BLUE:
 422             data[p++]=GLX_ACCUM_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 423           case WX_GL_MIN_ACCUM_ALPHA:
 424             data[p++]=GLX_ACCUM_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 425           default:
 426             break;
 427         }
 428       }
 429       data[p] = 0;
 430
 431       attribList = (int*) data;
 432     }
 433
 434
 435     Display *dpy = GDK_DISPLAY();
 436
 437     return glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 438 }
 439
 440 void wxGLCanvas::SwapBuffers()
 441 {
 442     if (m_glContext)
 443         m_glContext->SwapBuffers();
 444 }
 445
 446 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 447 {
 448 }
 449
 450 void wxGLCanvas::SetCurrent()
 451 {
 452     if (m_glContext)
 453         m_glContext->SetCurrent();
 454 }
 455
 456 void wxGLCanvas::SetColour( const wxChar *colour )
 457 {
 458     if (m_glContext)
 459         m_glContext->SetColour( colour );
 460 }
 461
 462 void wxGLCanvas::OnInternalIdle()
 463 {
 464     if (m_glContext && m_exposed)
 465     {
 466         wxPaintEvent event( GetId() );
 467         event.SetEventObject( this );
 468         GetEventHandler()->ProcessEvent( event );
 469
 470         m_exposed = FALSE;
 471         GetUpdateRegion().Clear();
 472     }
 473
 474     wxWindow::OnInternalIdle();
 475 }
 476
 477
 478
 479 //---------------------------------------------------------------------------
 480 // wxGLApp
 481 //---------------------------------------------------------------------------
 482
 483 IMPLEMENT_CLASS(wxGLApp, wxApp)
 484
 485 wxGLApp::~wxGLApp()
 486 {
 487     if (m_glVisualInfo)
 488         XFree(m_glVisualInfo);
 489 }
 490
 491 bool wxGLApp::InitGLVisual(int *attribList)
 492 {
 493     if (m_glVisualInfo)
 494         XFree(m_glVisualInfo);
 495
 496     m_glVisualInfo = wxGLCanvas::ChooseGLVisual(attribList);
 497
 498     return m_glVisualInfo != NULL;
 499 }
 500
 501 #endif
 502     // wxUSE_GLCANVAS
 503