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