src/gtk/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  13 #pragma implementation "glcanvas.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #include "wx/setup.h"
  20
  21 #if wxUSE_GLCANVAS
  22
  23 #include "wx/glcanvas.h"
  24
  25 #include "wx/frame.h"
  26 #include "wx/colour.h"
  27 #include "wx/module.h"
  28 #include "wx/app.h"
  29
  30 extern "C"
  31 {
  32 #include "gtk/gtk.h"
  33 #include "gdk/gdk.h"
  34 #include "gdk/gdkx.h"
  35 }
  36
  37 #include "wx/gtk/win_gtk.h"
  38
  39 // DLL options compatibility check:
  40 #include "wx/build.h"
  41 WX_CHECK_BUILD_OPTIONS("wxGL")
  42
  43 //---------------------------------------------------------------------------
  44 // global data
  45 //---------------------------------------------------------------------------
  46
  47 XVisualInfo *g_vi = (XVisualInfo*) NULL;
  48
  49 //-----------------------------------------------------------------------------
  50 // idle system
  51 //-----------------------------------------------------------------------------
  52
  53 extern void wxapp_install_idle_handler();
  54 extern bool g_isIdle;
  55
  56 //---------------------------------------------------------------------------
  57 // wxGLContext
  58 //---------------------------------------------------------------------------
  59
  60 IMPLEMENT_CLASS(wxGLContext,wxObject)
  61
  62 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
  63 {
  64     m_window = win;
  65     m_widget = win->m_wxwindow;
  66
  67     wxGLCanvas *gc = (wxGLCanvas*) win;
  68     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  69
  70     wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
  71
  72     m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
  73
  74     wxCHECK_RET( m_glContext, _T("Couldn't create OpenGl context") );
  75 }
  76
  77 wxGLContext::wxGLContext(
  78                bool WXUNUSED(isRGB), wxWindow *win,
  79                const wxPalette& WXUNUSED(palette),
  80                const wxGLContext *other        /* for sharing display lists */
  81 )
  82 {
  83     m_window = win;
  84     m_widget = win->m_wxwindow;
  85
  86     wxGLCanvas *gc = (wxGLCanvas*) win;
  87     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  88
  89     wxCHECK_RET( vi, _T("invalid visual for OpenGl") );
  90
  91     m_glContext = glXCreateContext( GDK_DISPLAY(), vi,
  92                                     other ? other->m_glContext : None,
  93                                     GL_TRUE );
  94
  95     if ( !m_glContext )
  96     {
  97         wxFAIL_MSG( _T("Couldn't create OpenGl context") );
  98     }
  99 }
 100
 101 wxGLContext::~wxGLContext()
 102 {
 103     if (!m_glContext) return;
 104
 105     if (m_glContext == glXGetCurrentContext())
 106     {
 107         glXMakeCurrent( GDK_DISPLAY(), None, NULL);
 108     }
 109
 110     glXDestroyContext( GDK_DISPLAY(), m_glContext );
 111 }
 112
 113 void wxGLContext::SwapBuffers()
 114 {
 115     if (m_glContext)
 116     {
 117         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 118         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
 119     }
 120 }
 121
 122 void wxGLContext::SetCurrent()
 123 {
 124     if (m_glContext)
 125     {
 126         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 127         glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
 128     }
 129 }
 130
 131 void wxGLContext::SetColour(const wxChar *colour)
 132 {
 133     wxColour col = wxTheColourDatabase->Find(colour);
 134     if (col.Ok())
 135     {
 136         float r = (float)(col.Red()/256.0);
 137         float g = (float)(col.Green()/256.0);
 138         float 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     // VZ: apparently in some cases we're called twice -- no idea why,
 164     //     but a check doesn't hurt
 165     if ( !win->m_glContext )
 166     {
 167         wxGLContext *share = win->m_sharedContext;
 168         if ( !share && win->m_sharedContextOf )
 169             share = win->m_sharedContextOf->GetContext();
 170
 171         win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, share );
 172     }
 173
 174     return FALSE;
 175 }
 176
 177 //-----------------------------------------------------------------------------
 178 // "map" from m_wxwindow
 179 //-----------------------------------------------------------------------------
 180
 181 static gint
 182 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 183 {
 184     if (win->m_glContext/* && win->m_exposed*/)
 185     {
 186         wxPaintEvent event( win->GetId() );
 187         event.SetEventObject( win );
 188         win->GetEventHandler()->ProcessEvent( event );
 189
 190         win->m_exposed = FALSE;
 191         win->GetUpdateRegion().Clear();
 192     }
 193
 194     return FALSE;
 195 }
 196
 197 //-----------------------------------------------------------------------------
 198 // "expose_event" of m_wxwindow
 199 //-----------------------------------------------------------------------------
 200
 201 static void
 202 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
 203 {
 204     if (g_isIdle)
 205         wxapp_install_idle_handler();
 206
 207     win->m_exposed = TRUE;
 208
 209     win->GetUpdateRegion().Union( gdk_event->area.x,
 210                                   gdk_event->area.y,
 211                                   gdk_event->area.width,
 212                                   gdk_event->area.height );
 213 }
 214
 215 //-----------------------------------------------------------------------------
 216 // "draw" of m_wxwindow
 217 //-----------------------------------------------------------------------------
 218
 219 #ifndef __WXGTK20__
 220 static void
 221 gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
 222 {
 223     if (g_isIdle)
 224         wxapp_install_idle_handler();
 225
 226     win->m_exposed = TRUE;
 227
 228     win->GetUpdateRegion().Union( rect->x, rect->y,
 229                                   rect->width, rect->height );
 230 }
 231 #endif
 232
 233 //-----------------------------------------------------------------------------
 234 // "size_allocate" of m_wxwindow
 235 //-----------------------------------------------------------------------------
 236
 237 static void
 238 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
 239 {
 240     if (g_isIdle)
 241         wxapp_install_idle_handler();
 242
 243     if (!win->m_hasVMT)
 244         return;
 245
 246     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 247     event.SetEventObject( win );
 248     win->GetEventHandler()->ProcessEvent( event );
 249 }
 250
 251 //---------------------------------------------------------------------------
 252 // wxGlCanvas
 253 //---------------------------------------------------------------------------
 254
 255 IMPLEMENT_CLASS(wxGLCanvas, wxWindow)
 256
 257 BEGIN_EVENT_TABLE(wxGLCanvas, wxWindow)
 258     EVT_SIZE(wxGLCanvas::OnSize)
 259 END_EVENT_TABLE()
 260
 261 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 262                         const wxPoint& pos, const wxSize& size,
 263                         long style, const wxString& name,
 264                         int *attribList,
 265                         const wxPalette& palette )
 266 {
 267     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 268 }
 269
 270 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 271                         const wxGLContext *shared,
 272                         wxWindowID id,
 273                         const wxPoint& pos, const wxSize& size,
 274                         long style, const wxString& name,
 275                         int *attribList,
 276                         const wxPalette& palette )
 277 {
 278     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 279 }
 280
 281 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 282                         const wxGLCanvas *shared,
 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     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 290 }
 291
 292 bool wxGLCanvas::Create( wxWindow *parent,
 293                          const wxGLContext *shared,
 294                          const wxGLCanvas *shared_context_of,
 295                          wxWindowID id,
 296                          const wxPoint& pos, const wxSize& size,
 297                          long style, const wxString& name,
 298                          int *attribList,
 299                          const wxPalette& palette)
 300 {
 301     m_sharedContext = (wxGLContext*)shared;  // const_cast
 302     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 303     m_glContext = (wxGLContext*) NULL;
 304
 305     m_exposed = FALSE;
 306     m_noExpose = TRUE;
 307     m_nativeSizeEvent = TRUE;
 308
 309     XVisualInfo *vi = NULL;
 310     if (wxTheApp->m_glVisualInfo != NULL)
 311     {
 312         vi = (XVisualInfo *) wxTheApp->m_glVisualInfo;
 313         m_canFreeVi = FALSE; // owned by wxTheApp - don't free upon destruction
 314     }
 315     else
 316     {
 317         vi = (XVisualInfo *) ChooseGLVisual(attribList);
 318         m_canFreeVi = TRUE;
 319     }
 320     m_vi = vi;  // save for later use
 321
 322     wxCHECK_MSG( m_vi, FALSE, _T("required visual couldn't be found") );
 323
 324     GdkVisual *visual = gdkx_visual_get( vi->visualid );
 325     GdkColormap *colormap = gdk_colormap_new( visual, TRUE );
 326
 327     gtk_widget_push_colormap( colormap );
 328     gtk_widget_push_visual( visual );
 329
 330     wxWindow::Create( parent, id, pos, size, style, name );
 331
 332     m_glWidget = m_wxwindow;
 333
 334 #ifdef __WXGTK20__
 335     gtk_widget_set_double_buffered( m_glWidget, FALSE );
 336 #endif
 337
 338     gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );
 339
 340     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
 341                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 342
 343     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "map",
 344                             GTK_SIGNAL_FUNC(gtk_glwindow_map_callback), (gpointer) this );
 345
 346     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
 347         GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
 348
 349 #ifndef __WXGTK20__
 350     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
 351         GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
 352 #endif
 353
 354     gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
 355         GTK_SIGNAL_FUNC(gtk_glcanvas_size_callback), (gpointer)this );
 356
 357     gtk_widget_pop_visual();
 358     gtk_widget_pop_colormap();
 359
 360     if (GTK_WIDGET_REALIZED(m_wxwindow))
 361         gtk_glwindow_realized_callback( m_wxwindow, this );
 362
 363     if (GTK_WIDGET_MAPPED(m_wxwindow))
 364         gtk_glwindow_map_callback( m_wxwindow, this );
 365
 366     return TRUE;
 367 }
 368
 369 wxGLCanvas::~wxGLCanvas()
 370 {
 371     XVisualInfo *vi = (XVisualInfo *) m_vi;
 372
 373     if (vi && m_canFreeVi) XFree( vi );
 374     delete m_glContext;
 375 }
 376
 377 void* wxGLCanvas::ChooseGLVisual(int *attribList)
 378 {
 379     int data[512];
 380     if (!attribList)
 381     {
 382         // default settings if attriblist = 0
 383         data[0] = GLX_RGBA;
 384         data[1] = GLX_DOUBLEBUFFER;
 385         data[2] = GLX_DEPTH_SIZE;   data[3] = 1;
 386         data[4] = GLX_RED_SIZE;     data[5] = 1;
 387         data[6] = GLX_GREEN_SIZE;   data[7] = 1;
 388         data[8] = GLX_BLUE_SIZE;    data[9] = 1;
 389         data[10] = GLX_ALPHA_SIZE;  data[11] = 0;
 390         data[12] = None;
 391
 392         attribList = (int*) data;
 393     }
 394     else
 395     {
 396       int arg=0, p=0;
 397
 398       while( (attribList[arg]!=0) && (p<510) )
 399       {
 400         switch( attribList[arg++] )
 401         {
 402           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 403           case WX_GL_BUFFER_SIZE:
 404             data[p++]=GLX_BUFFER_SIZE; data[p++]=attribList[arg++]; break;
 405           case WX_GL_LEVEL:
 406             data[p++]=GLX_LEVEL; data[p++]=attribList[arg++]; break;
 407           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 408           case WX_GL_STEREO: data[p++] = GLX_STEREO; break;
 409           case WX_GL_AUX_BUFFERS:
 410             data[p++]=GLX_AUX_BUFFERS; data[p++]=attribList[arg++]; break;
 411           case WX_GL_MIN_RED:
 412             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 413           case WX_GL_MIN_GREEN:
 414             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 415           case WX_GL_MIN_BLUE:
 416             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 417           case WX_GL_MIN_ALPHA:
 418             data[p++]=GLX_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 419           case WX_GL_DEPTH_SIZE:
 420             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 421           case WX_GL_STENCIL_SIZE:
 422             data[p++]=GLX_STENCIL_SIZE; data[p++]=attribList[arg++]; break;
 423           case WX_GL_MIN_ACCUM_RED:
 424             data[p++]=GLX_ACCUM_RED_SIZE; data[p++]=attribList[arg++]; break;
 425           case WX_GL_MIN_ACCUM_GREEN:
 426             data[p++]=GLX_ACCUM_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 427           case WX_GL_MIN_ACCUM_BLUE:
 428             data[p++]=GLX_ACCUM_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 429           case WX_GL_MIN_ACCUM_ALPHA:
 430             data[p++]=GLX_ACCUM_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 431           default:
 432             break;
 433         }
 434       }
 435       data[p] = 0;
 436
 437       attribList = (int*) data;
 438     }
 439
 440
 441     Display *dpy = GDK_DISPLAY();
 442
 443     return glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 444 }
 445
 446 void wxGLCanvas::SwapBuffers()
 447 {
 448     if (m_glContext)
 449         m_glContext->SwapBuffers();
 450 }
 451
 452 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 453 {
 454 }
 455
 456 void wxGLCanvas::SetCurrent()
 457 {
 458     if (m_glContext)
 459         m_glContext->SetCurrent();
 460 }
 461
 462 void wxGLCanvas::SetColour( const wxChar *colour )
 463 {
 464     if (m_glContext)
 465         m_glContext->SetColour( colour );
 466 }
 467
 468 void wxGLCanvas::OnInternalIdle()
 469 {
 470     if (m_glContext && m_exposed)
 471     {
 472         wxPaintEvent event( GetId() );
 473         event.SetEventObject( this );
 474         GetEventHandler()->ProcessEvent( event );
 475
 476         m_exposed = FALSE;
 477         GetUpdateRegion().Clear();
 478     }
 479
 480     wxWindow::OnInternalIdle();
 481 }
 482
 483
 484
 485 //---------------------------------------------------------------------------
 486 // wxGLApp
 487 //---------------------------------------------------------------------------
 488
 489 IMPLEMENT_CLASS(wxGLApp, wxApp)
 490
 491 wxGLApp::~wxGLApp()
 492 {
 493     if (m_glVisualInfo)
 494         XFree(m_glVisualInfo);
 495 }
 496
 497 bool wxGLApp::InitGLVisual(int *attribList)
 498 {
 499     if (m_glVisualInfo)
 500         XFree(m_glVisualInfo);
 501
 502     m_glVisualInfo = wxGLCanvas::ChooseGLVisual(attribList);
 503
 504     return m_glVisualInfo != NULL;
 505 }
 506
 507 #endif
 508     // wxUSE_GLCANVAS
 509