src/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 "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 #include "gtk/gtk.h"
  29 #include "gdk/gdk.h"
  30 #include "gdk/gdkx.h"
  31 }
  32
  33 #include "wx/gtk/win_gtk.h"
  34
  35 //---------------------------------------------------------------------------
  36 // global data
  37 //---------------------------------------------------------------------------
  38
  39 XVisualInfo *g_vi = (XVisualInfo*) NULL;
  40
  41 //-----------------------------------------------------------------------------
  42 // idle system
  43 //-----------------------------------------------------------------------------
  44
  45 extern void wxapp_install_idle_handler();
  46 extern bool g_isIdle;
  47
  48 //---------------------------------------------------------------------------
  49 // wxGLContext
  50 //---------------------------------------------------------------------------
  51
  52 IMPLEMENT_CLASS(wxGLContext,wxObject)
  53
  54 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
  55 {
  56     m_window = win;
  57     m_widget = win->m_wxwindow;
  58
  59     wxGLCanvas *gc = (wxGLCanvas*) win;
  60     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  61
  62     wxCHECK_RET( vi, "invalid visual for OpenGl" );
  63
  64     m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
  65
  66     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  67 }
  68
  69 wxGLContext::wxGLContext(
  70                bool WXUNUSED(isRGB), wxWindow *win,
  71                const wxPalette& WXUNUSED(palette),
  72                const wxGLContext *other        /* for sharing display lists */
  73 )
  74 {
  75     m_window = win;
  76     m_widget = win->m_wxwindow;
  77
  78     wxGLCanvas *gc = (wxGLCanvas*) win;
  79     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  80
  81     wxCHECK_RET( vi, "invalid visual for OpenGl" );
  82
  83     if( other != 0 )
  84         m_glContext = glXCreateContext( GDK_DISPLAY(), vi, other->m_glContext, GL_TRUE );
  85     else
  86         m_glContext = glXCreateContext( GDK_DISPLAY(), vi, None, GL_TRUE );
  87
  88     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  89 }
  90
  91 wxGLContext::~wxGLContext()
  92 {
  93     if (!m_glContext) return;
  94
  95     if (m_glContext == glXGetCurrentContext())
  96     {
  97         glXMakeCurrent( GDK_DISPLAY(), None, NULL);
  98     }
  99
 100     glXDestroyContext( GDK_DISPLAY(), m_glContext );
 101 }
 102
 103 void wxGLContext::SwapBuffers()
 104 {
 105     if (m_glContext)
 106     {
 107         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 108         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
 109     }
 110 }
 111
 112 void wxGLContext::SetCurrent()
 113 {
 114     if (m_glContext)
 115     {
 116         GdkWindow *window = GTK_PIZZA(m_widget)->bin_window;
 117         glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
 118     }
 119 }
 120
 121 void wxGLContext::SetColour(const char *colour)
 122 {
 123     float r = 0.0;
 124     float g = 0.0;
 125     float b = 0.0;
 126     wxColour *col = wxTheColourDatabase->FindColour(colour);
 127     if (col)
 128     {
 129         r = (float)(col->Red()/256.0);
 130         g = (float)(col->Green()/256.0);
 131         b = (float)(col->Blue()/256.0);
 132         glColor3f( r, g, b);
 133     }
 134 }
 135
 136 void wxGLContext::SetupPixelFormat()
 137 {
 138 }
 139
 140 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 141 {
 142 }
 143
 144 wxPalette wxGLContext::CreateDefaultPalette()
 145 {
 146     return wxNullPalette;
 147 }
 148
 149 //-----------------------------------------------------------------------------
 150 // "realize" from m_wxwindow
 151 //-----------------------------------------------------------------------------
 152
 153 static gint
 154 gtk_glwindow_realized_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 155 {
 156     wxGLContext *share= win->m_sharedContext;
 157     if (share==NULL && win->m_sharedContextOf) share=win->m_sharedContextOf->GetContext();
 158
 159     win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, share );
 160
 161     return FALSE;
 162 }
 163
 164 //-----------------------------------------------------------------------------
 165 // "map" from m_wxwindow
 166 //-----------------------------------------------------------------------------
 167
 168 static gint
 169 gtk_glwindow_map_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 170 {
 171     if (win->m_glContext/* && win->m_exposed*/)
 172     {
 173         wxPaintEvent event( win->GetId() );
 174         event.SetEventObject( win );
 175         win->GetEventHandler()->ProcessEvent( event );
 176
 177         win->m_exposed = FALSE;
 178         win->GetUpdateRegion().Clear();
 179     }
 180
 181     return FALSE;
 182 }
 183
 184 //-----------------------------------------------------------------------------
 185 // "expose_event" of m_wxwindow
 186 //-----------------------------------------------------------------------------
 187
 188 static void
 189 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
 190 {
 191     if (g_isIdle)
 192         wxapp_install_idle_handler();
 193
 194     win->m_exposed = TRUE;
 195
 196     win->GetUpdateRegion().Union( gdk_event->area.x,
 197                                   gdk_event->area.y,
 198                                   gdk_event->area.width,
 199                                   gdk_event->area.height );
 200 }
 201
 202 //-----------------------------------------------------------------------------
 203 // "draw" of m_wxwindow
 204 //-----------------------------------------------------------------------------
 205
 206 static void
 207 gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
 208 {
 209     if (g_isIdle)
 210         wxapp_install_idle_handler();
 211
 212     win->m_exposed = TRUE;
 213
 214     win->GetUpdateRegion().Union( rect->x, rect->y,
 215                                   rect->width, rect->height );
 216 }
 217
 218 //-----------------------------------------------------------------------------
 219 // "size_allocate" of m_wxwindow
 220 //-----------------------------------------------------------------------------
 221
 222 static void
 223 gtk_glcanvas_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxGLCanvas *win )
 224 {
 225     if (g_isIdle)
 226         wxapp_install_idle_handler();
 227
 228     if (!win->m_hasVMT)
 229         return;
 230
 231     wxSizeEvent event( wxSize(win->m_width,win->m_height), win->GetId() );
 232     event.SetEventObject( win );
 233     win->GetEventHandler()->ProcessEvent( event );
 234 }
 235
 236 //---------------------------------------------------------------------------
 237 // wxGlCanvas
 238 //---------------------------------------------------------------------------
 239
 240 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 241
 242 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 243     EVT_SIZE(wxGLCanvas::OnSize)
 244 END_EVENT_TABLE()
 245
 246 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 247                         const wxPoint& pos, const wxSize& size,
 248                         long style, const wxString& name,
 249                         int *attribList,
 250                         const wxPalette& palette )
 251 {
 252     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 253 }
 254
 255 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 256                         const wxGLContext *shared,
 257                         wxWindowID id,
 258                         const wxPoint& pos, const wxSize& size,
 259                         long style, const wxString& name,
 260                         int *attribList,
 261                         const wxPalette& palette )
 262 {
 263     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 264 }
 265
 266 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 267                         const wxGLCanvas *shared,
 268                         wxWindowID id,
 269                         const wxPoint& pos, const wxSize& size,
 270                         long style, const wxString& name,
 271                         int *attribList,
 272                         const wxPalette& palette )
 273 {
 274     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 275 }
 276
 277 bool wxGLCanvas::Create( wxWindow *parent,
 278                          const wxGLContext *shared,
 279                          const wxGLCanvas *shared_context_of,
 280                          wxWindowID id,
 281                          const wxPoint& pos, const wxSize& size,
 282                          long style, const wxString& name,
 283                          int *attribList,
 284                          const wxPalette& palette)
 285 {
 286     m_sharedContext = (wxGLContext*)shared;  // const_cast
 287     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 288     m_glContext = (wxGLContext*) NULL;
 289
 290     m_exposed = FALSE;
 291     m_noExpose = TRUE;
 292     m_nativeSizeEvent = TRUE;
 293
 294     if (!attribList)
 295     {
 296         int data[] = { GLX_RGBA,
 297                        GLX_DOUBLEBUFFER,
 298                        GLX_DEPTH_SIZE, 1,  // use largest available depth buffer
 299                        GLX_RED_SIZE, 1,
 300                        GLX_GREEN_SIZE, 1,
 301                        GLX_BLUE_SIZE, 1,
 302                        GLX_ALPHA_SIZE, 0,
 303                        None };
 304         attribList = (int*) data;
 305     }
 306     else
 307     {
 308       int data[512], arg=0, p=0;
 309
 310       while( (attribList[arg]!=0) && (p<512) )
 311       {
 312         switch( attribList[arg++] )
 313         {
 314           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 315           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 316           case WX_GL_DEPTH_SIZE:
 317             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 318           case WX_GL_MIN_RED:
 319             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 320           case WX_GL_MIN_GREEN:
 321             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 322           case WX_GL_MIN_BLUE:
 323             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 324           default:
 325             break;
 326         }
 327       }
 328       data[p] = 0;
 329
 330       attribList = (int*) data;
 331     }
 332
 333
 334     Display *dpy = GDK_DISPLAY();
 335
 336     XVisualInfo *vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 337
 338     m_vi = vi;  // safe for later use
 339
 340     wxCHECK_MSG( m_vi, FALSE, "required visual couldn't be found" );
 341
 342     GdkVisual *visual = gdkx_visual_get( vi->visualid );
 343     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(vi->visualid), TRUE );
 344
 345     gtk_widget_push_colormap( colormap );
 346     gtk_widget_push_visual( visual );
 347
 348     wxScrolledWindow::Create( parent, id, pos, size, style, name );
 349
 350     m_glWidget = m_wxwindow;
 351
 352     gtk_pizza_set_clear( GTK_PIZZA(m_wxwindow), FALSE );
 353
 354     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
 355                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 356
 357     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "map",
 358                             GTK_SIGNAL_FUNC(gtk_glwindow_map_callback), (gpointer) this );
 359
 360     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
 361         GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
 362
 363     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
 364         GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
 365
 366     gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
 367         GTK_SIGNAL_FUNC(gtk_glcanvas_size_callback), (gpointer)this );
 368
 369     gtk_widget_pop_visual();
 370     gtk_widget_pop_colormap();
 371
 372     return TRUE;
 373 }
 374
 375 wxGLCanvas::~wxGLCanvas()
 376 {
 377     XVisualInfo *vi = (XVisualInfo *) m_vi;
 378
 379     if (vi) XFree( vi );
 380     if (m_glContext) delete m_glContext;
 381 }
 382
 383 void wxGLCanvas::SwapBuffers()
 384 {
 385     if (m_glContext) m_glContext->SwapBuffers();
 386 }
 387
 388 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 389 {
 390     int width, height;
 391     GetClientSize( &width, &height );
 392
 393     if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
 394     {
 395         SetCurrent();
 396
 397         glViewport(0, 0, (GLint)width, (GLint)height );
 398         glMatrixMode(GL_PROJECTION);
 399         glLoadIdentity();
 400         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 401         glMatrixMode(GL_MODELVIEW);
 402     }
 403 }
 404
 405 void wxGLCanvas::SetCurrent()
 406 {
 407     if (m_glContext) m_glContext->SetCurrent();
 408 }
 409
 410 void wxGLCanvas::SetColour( const char *colour )
 411 {
 412     if (m_glContext) m_glContext->SetColour( colour );
 413 }
 414
 415 void wxGLCanvas::OnInternalIdle()
 416 {
 417     if (m_glContext && m_exposed)
 418     {
 419         wxPaintEvent event( GetId() );
 420         event.SetEventObject( this );
 421         GetEventHandler()->ProcessEvent( event );
 422
 423         m_exposed = FALSE;
 424         GetUpdateRegion().Clear();
 425     }
 426
 427     wxWindow::OnInternalIdle();
 428 }
 429
 430 #endif
 431     // wxUSE_GLCANVAS
 432