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 static void
 210 gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
 211 {
 212     if (g_isIdle)
 213         wxapp_install_idle_handler();
 214
 215     win->m_exposed = TRUE;
 216
 217     win->GetUpdateRegion().Union( rect->x, rect->y,
 218                                   rect->width, rect->height );
 219 }
 220
 221 //-----------------------------------------------------------------------------
 222 // "size_allocate" of m_wxwindow
 223 //-----------------------------------------------------------------------------
 224
 225 static void
 226 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
 227 {
 228     if (g_isIdle)
 229         wxapp_install_idle_handler();
 230
 231     if (!win->m_hasVMT)
 232         return;
 233
 234     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 235     event.SetEventObject( win );
 236     win->GetEventHandler()->ProcessEvent( event );
 237 }
 238
 239 //---------------------------------------------------------------------------
 240 // wxGlCanvas
 241 //---------------------------------------------------------------------------
 242
 243 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 244
 245 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
 246     EVT_SIZE(wxGLCanvas::OnSize)
 247 END_EVENT_TABLE()
 248
 249 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 250                         const wxPoint& pos, const wxSize& size,
 251                         long style, const wxString& name,
 252                         int *attribList,
 253                         const wxPalette& palette )
 254 {
 255     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 256 }
 257
 258 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 259                         const wxGLContext *shared,
 260                         wxWindowID id,
 261                         const wxPoint& pos, const wxSize& size,
 262                         long style, const wxString& name,
 263                         int *attribList,
 264                         const wxPalette& palette )
 265 {
 266     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 267 }
 268
 269 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 270                         const wxGLCanvas *shared,
 271                         wxWindowID id,
 272                         const wxPoint& pos, const wxSize& size,
 273                         long style, const wxString& name,
 274                         int *attribList,
 275                         const wxPalette& palette )
 276 {
 277     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 278 }
 279
 280 bool wxGLCanvas::Create( wxWindow *parent,
 281                          const wxGLContext *shared,
 282                          const wxGLCanvas *shared_context_of,
 283                          wxWindowID id,
 284                          const wxPoint& pos, const wxSize& size,
 285                          long style, const wxString& name,
 286                          int *attribList,
 287                          const wxPalette& palette)
 288 {
 289     m_sharedContext = (wxGLContext*)shared;  // const_cast
 290     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 291     m_glContext = (wxGLContext*) NULL;
 292
 293     m_exposed = FALSE;
 294     m_noExpose = TRUE;
 295     m_nativeSizeEvent = TRUE;
 296
 297     XVisualInfo *vi = NULL;
 298     if (wxTheApp->m_glVisualInfo != NULL)
 299     {
 300         vi = (XVisualInfo *) wxTheApp->m_glVisualInfo;
 301         m_canFreeVi = FALSE; // owned by wxTheApp - don't free upon destruction
 302     }
 303     else
 304     {
 305         vi = (XVisualInfo *) ChooseGLVisual(attribList);
 306         m_canFreeVi = TRUE;
 307     }
 308     m_vi = vi;  // save for later use
 309
 310     wxCHECK_MSG( m_vi, FALSE, _T("required visual couldn't be found") );
 311
 312     GdkVisual *visual = gdkx_visual_get( vi->visualid );
 313     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(vi->visualid), TRUE );
 314
 315     gtk_widget_push_colormap( colormap );
 316     gtk_widget_push_visual( visual );
 317
 318     wxWindow::Create( parent, id, pos, size, style, name );
 319
 320     m_glWidget = m_wxwindow;
 321
 322     gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );
 323
 324     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
 325                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 326
 327     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "map",
 328                             GTK_SIGNAL_FUNC(gtk_glwindow_map_callback), (gpointer) this );
 329
 330     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
 331         GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
 332
 333     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
 334         GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
 335
 336     gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
 337         GTK_SIGNAL_FUNC(gtk_glcanvas_size_callback), (gpointer)this );
 338
 339     gtk_widget_pop_visual();
 340     gtk_widget_pop_colormap();
 341
 342     if (GTK_WIDGET_REALIZED(m_wxwindow))
 343         gtk_glwindow_realized_callback( m_wxwindow, this );
 344
 345     if (GTK_WIDGET_MAPPED(m_wxwindow))
 346         gtk_glwindow_map_callback( m_wxwindow, this );
 347
 348     return TRUE;
 349 }
 350
 351 wxGLCanvas::~wxGLCanvas()
 352 {
 353     XVisualInfo *vi = (XVisualInfo *) m_vi;
 354
 355     if (vi && m_canFreeVi) XFree( vi );
 356     if (m_glContext) delete m_glContext;
 357 }
 358
 359 void* wxGLCanvas::ChooseGLVisual(int *attribList)
 360 {
 361     int data[512];
 362     if (!attribList)
 363     {
 364         // default settings if attriblist = 0
 365         data[0] = GLX_RGBA;
 366         data[1] = GLX_DOUBLEBUFFER;
 367         data[2] = GLX_DEPTH_SIZE;   data[3] = 1;
 368         data[4] = GLX_RED_SIZE;     data[5] = 1;
 369         data[6] = GLX_GREEN_SIZE;   data[7] = 1;
 370         data[8] = GLX_BLUE_SIZE;    data[9] = 1;
 371         data[10] = GLX_ALPHA_SIZE;  data[11] = 0;
 372         data[12] = None;
 373
 374         attribList = (int*) data;
 375     }
 376     else
 377     {
 378       int arg=0, p=0;
 379
 380       while( (attribList[arg]!=0) && (p<510) )
 381       {
 382         switch( attribList[arg++] )
 383         {
 384           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 385           case WX_GL_BUFFER_SIZE:
 386             data[p++]=GLX_BUFFER_SIZE; data[p++]=attribList[arg++]; break;
 387           case WX_GL_LEVEL:
 388             data[p++]=GLX_LEVEL; data[p++]=attribList[arg++]; break;
 389           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 390           case WX_GL_STEREO: data[p++] = GLX_STEREO; break;
 391           case WX_GL_AUX_BUFFERS:
 392             data[p++]=GLX_AUX_BUFFERS; data[p++]=attribList[arg++]; break;
 393           case WX_GL_MIN_RED:
 394             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 395           case WX_GL_MIN_GREEN:
 396             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 397           case WX_GL_MIN_BLUE:
 398             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 399           case WX_GL_MIN_ALPHA:
 400             data[p++]=GLX_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 401           case WX_GL_DEPTH_SIZE:
 402             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 403           case WX_GL_STENCIL_SIZE:
 404             data[p++]=GLX_STENCIL_SIZE; data[p++]=attribList[arg++]; break;
 405           case WX_GL_MIN_ACCUM_RED:
 406             data[p++]=GLX_ACCUM_RED_SIZE; data[p++]=attribList[arg++]; break;
 407           case WX_GL_MIN_ACCUM_GREEN:
 408             data[p++]=GLX_ACCUM_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 409           case WX_GL_MIN_ACCUM_BLUE:
 410             data[p++]=GLX_ACCUM_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 411           case WX_GL_MIN_ACCUM_ALPHA:
 412             data[p++]=GLX_ACCUM_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 413           default:
 414             break;
 415         }
 416       }
 417       data[p] = 0;
 418
 419       attribList = (int*) data;
 420     }
 421
 422
 423     Display *dpy = GDK_DISPLAY();
 424
 425     return glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 426 }
 427
 428 void wxGLCanvas::SwapBuffers()
 429 {
 430     if (m_glContext)
 431         m_glContext->SwapBuffers();
 432 }
 433
 434 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 435 {
 436 }
 437
 438 void wxGLCanvas::SetCurrent()
 439 {
 440     if (m_glContext)
 441         m_glContext->SetCurrent();
 442 }
 443
 444 void wxGLCanvas::SetColour( const wxChar *colour )
 445 {
 446     if (m_glContext)
 447         m_glContext->SetColour( colour );
 448 }
 449
 450 void wxGLCanvas::OnInternalIdle()
 451 {
 452     if (m_glContext && m_exposed)
 453     {
 454         wxPaintEvent event( GetId() );
 455         event.SetEventObject( this );
 456         GetEventHandler()->ProcessEvent( event );
 457
 458         m_exposed = FALSE;
 459         GetUpdateRegion().Clear();
 460     }
 461
 462     wxWindow::OnInternalIdle();
 463 }
 464
 465
 466
 467 //---------------------------------------------------------------------------
 468 // wxGLApp
 469 //---------------------------------------------------------------------------
 470
 471 IMPLEMENT_CLASS(wxGLApp, wxApp)
 472
 473 wxGLApp::~wxGLApp()
 474 {
 475     if (m_glVisualInfo)
 476         XFree(m_glVisualInfo);
 477 }
 478
 479 bool wxGLApp::InitGLVisual(int *attribList)
 480 {
 481     if (m_glVisualInfo)
 482         XFree(m_glVisualInfo);
 483
 484     m_glVisualInfo = wxGLCanvas::ChooseGLVisual(attribList);
 485
 486     return m_glVisualInfo != NULL;
 487 }
 488
 489 #endif
 490     // wxUSE_GLCANVAS
 491