utils/glcanvas/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 "glcanvas.h"
  17
  18 #include "wx/frame.h"
  19 #include "wx/colour.h"
  20 #include "wx/module.h"
  21 #include "wx/app.h"
  22
  23 extern "C" {
  24 #include "gtk/gtk.h"
  25 #include "gdk/gdk.h"
  26 #include "gdk/gdkx.h"
  27 }
  28
  29 #include "wx/gtk/win_gtk.h"
  30
  31 //---------------------------------------------------------------------------
  32 // global data
  33 //---------------------------------------------------------------------------
  34
  35 XVisualInfo *g_vi = (XVisualInfo*) NULL;
  36
  37 //---------------------------------------------------------------------------
  38 // wxGLContext
  39 //---------------------------------------------------------------------------
  40
  41 IMPLEMENT_CLASS(wxGLContext,wxObject)
  42
  43 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, const wxPalette& WXUNUSED(palette) )
  44 {
  45     m_window = win;
  46     m_widget = ((wxGLCanvas*)win)->m_glWidget;
  47
  48     wxCHECK_RET( g_vi, "invalid visual for OpenGl" );
  49
  50     m_glContext = glXCreateContext( GDK_DISPLAY(), g_vi, None, GL_TRUE );
  51
  52     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  53 }
  54
  55 wxGLContext::wxGLContext(
  56                bool WXUNUSED(isRGB), wxWindow *win,
  57                const wxPalette& WXUNUSED(palette),
  58                const wxGLContext *other        /* for sharing display lists */
  59 )
  60 {
  61     m_window = win;
  62     m_widget = ((wxGLCanvas*)win)->m_glWidget;
  63
  64     wxCHECK_RET( g_vi, "invalid visual for OpenGl" );
  65
  66     if( other != 0 )
  67       m_glContext = glXCreateContext( GDK_DISPLAY(), g_vi, other->m_glContext,
  68                                       GL_TRUE );
  69     else
  70       m_glContext = glXCreateContext( GDK_DISPLAY(), g_vi, None, GL_TRUE );
  71
  72     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  73 }
  74
  75 wxGLContext::~wxGLContext()
  76 {
  77     if (!m_glContext) return;
  78
  79     if (m_glContext == glXGetCurrentContext())
  80     {
  81         glXMakeCurrent( GDK_DISPLAY(), None, NULL);
  82     }
  83
  84     glXDestroyContext( GDK_DISPLAY(), m_glContext );
  85 }
  86
  87 void wxGLContext::SwapBuffers()
  88 {
  89     if (m_glContext)
  90     {
  91         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( m_widget->window ) );
  92     }
  93 }
  94
  95 void wxGLContext::SetCurrent()
  96 {
  97     if (m_glContext)
  98     {
  99         glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(m_widget->window), m_glContext );
 100     }
 101 }
 102
 103 void wxGLContext::SetColour(const char *colour)
 104 {
 105     float r = 0.0;
 106     float g = 0.0;
 107     float b = 0.0;
 108     wxColour *col = wxTheColourDatabase->FindColour(colour);
 109     if (col)
 110     {
 111         r = (float)(col->Red()/256.0);
 112         g = (float)(col->Green()/256.0);
 113         b = (float)(col->Blue()/256.0);
 114         glColor3f( r, g, b);
 115     }
 116 }
 117
 118 void wxGLContext::SetupPixelFormat()
 119 {
 120 }
 121
 122 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 123 {
 124 }
 125
 126 wxPalette wxGLContext::CreateDefaultPalette()
 127 {
 128     return wxNullPalette;
 129 }
 130
 131 //-----------------------------------------------------------------------------
 132 // "expose_event" of m_glWidget
 133 //-----------------------------------------------------------------------------
 134
 135 static void gtk_window_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxWindow *win )
 136 {
 137     if (!win->m_hasVMT) return;
 138
 139     win->GetUpdateRegion().Union( gdk_event->area.x,
 140                                gdk_event->area.y,
 141                                gdk_event->area.width,
 142                                gdk_event->area.height );
 143
 144     if (gdk_event->count > 0) return;
 145
 146 /*
 147     printf( "OnExpose from " );
 148     if (win->GetClassInfo() && win->GetClassInfo()->GetClassName())
 149         printf( win->GetClassInfo()->GetClassName() );
 150     printf( ".\n" );
 151 */
 152
 153     wxPaintEvent event( win->GetId() );
 154     event.SetEventObject( win );
 155     win->GetEventHandler()->ProcessEvent( event );
 156
 157     win->GetUpdateRegion().Clear();
 158 }
 159
 160 //-----------------------------------------------------------------------------
 161 // "draw" of m_glWidget
 162 //-----------------------------------------------------------------------------
 163
 164 static void gtk_window_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxWindow *win )
 165 {
 166     if (!win->m_hasVMT) return;
 167
 168     win->GetUpdateRegion().Union( rect->x, rect->y, rect->width, rect->height );
 169
 170     wxPaintEvent event( win->GetId() );
 171     event.SetEventObject( win );
 172     win->GetEventHandler()->ProcessEvent( event );
 173
 174     win->GetUpdateRegion().Clear();
 175 }
 176
 177 //---------------------------------------------------------------------------
 178 // wxGlCanvas
 179 //---------------------------------------------------------------------------
 180
 181 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 182
 183 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 184     EVT_SIZE(wxGLCanvas::OnSize)
 185 END_EVENT_TABLE()
 186
 187 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 188                         const wxPoint& pos, const wxSize& size,
 189                         long style, const wxString& name,
 190                         int *attribList,
 191                         const wxPalette& palette )
 192 {
 193     Create( parent, NULL, id, pos, size, style, name, attribList, palette );
 194 }
 195
 196 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 197                         const wxGLContext *shared,
 198                         wxWindowID id,
 199                         const wxPoint& pos, const wxSize& size,
 200                         long style, const wxString& name,
 201                         int *attribList,
 202                         const wxPalette& palette )
 203 {
 204     Create( parent, shared, id, pos, size, style, name, attribList, palette );
 205 }
 206
 207 bool wxGLCanvas::Create( wxWindow *parent,
 208                          const wxGLContext *shared,
 209                          wxWindowID id,
 210                          const wxPoint& pos, const wxSize& size,
 211                          long style, const wxString& name,
 212                          int *attribList,
 213                          const wxPalette& palette)
 214 {
 215     if (!attribList)
 216     {
 217         int data[] = { GLX_RGBA,
 218                        GLX_DOUBLEBUFFER,
 219                        GLX_DEPTH_SIZE, 1,  /* use largest available depth buffer */
 220                        GLX_RED_SIZE, 1,
 221                        GLX_GREEN_SIZE, 1,
 222                        GLX_BLUE_SIZE, 1,
 223                        GLX_ALPHA_SIZE, 1,
 224                        None };
 225         attribList = (int*) data;
 226     }
 227     else
 228     {
 229       int data[512], arg=0, p=0;
 230
 231       while( (attribList[arg]!=0) && (p<512) )
 232       {
 233         switch( attribList[arg++] )
 234         {
 235           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 236           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 237           case WX_GL_DEPTH_SIZE:
 238             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 239           case WX_GL_MIN_RED:
 240             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 241           case WX_GL_MIN_GREEN:
 242             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 243           case WX_GL_MIN_BLUE:
 244             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 245           default:
 246             break;
 247         }
 248       }
 249       data[p] = 0;
 250
 251       attribList = (int*) data;
 252     }
 253
 254     Display *dpy = GDK_DISPLAY();
 255
 256     g_vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 257
 258     GdkVisual *visual = gdkx_visual_get( g_vi->visualid );
 259     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(g_vi->visualid), TRUE );
 260
 261     gtk_widget_push_colormap( colormap );
 262     gtk_widget_push_visual( visual );
 263
 264     m_glWidget = gtk_myfixed_new();
 265
 266     gtk_widget_pop_visual();
 267     gtk_widget_pop_colormap();
 268
 269     wxScrolledWindow::Create( parent, id, pos, size, style, name );
 270
 271     GTK_WIDGET_UNSET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 272     GTK_WIDGET_SET_FLAGS( m_glWidget, GTK_CAN_FOCUS );
 273
 274     gtk_myfixed_put( GTK_MYFIXED(m_wxwindow), m_glWidget, 0, 0, m_width, m_height );
 275
 276     gtk_signal_connect( GTK_OBJECT(m_glWidget), "expose_event",
 277       GTK_SIGNAL_FUNC(gtk_window_expose_callback), (gpointer)this );
 278
 279     gtk_signal_connect( GTK_OBJECT(m_glWidget), "draw",
 280       GTK_SIGNAL_FUNC(gtk_window_draw_callback), (gpointer)this );
 281
 282     /* connect to key press and mouse handlers etc. */
 283     ConnectWidget( m_glWidget );
 284
 285
 286     /* must be realized for OpenGl output */
 287     gtk_widget_realize( m_glWidget );
 288
 289     gtk_widget_show( m_glWidget );
 290
 291     m_glContext = new wxGLContext( TRUE, this, palette, shared );
 292
 293     XFree( g_vi );
 294     g_vi = (XVisualInfo*) NULL;
 295
 296     gdk_window_set_back_pixmap( m_glWidget->window, None, 0 );
 297
 298     return TRUE;
 299 }
 300
 301 wxGLCanvas::~wxGLCanvas()
 302 {
 303     if (m_glContext) delete m_glContext;
 304 }
 305
 306 void wxGLCanvas::SwapBuffers()
 307 {
 308     if (m_glContext) m_glContext->SwapBuffers();
 309 }
 310
 311 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 312 {
 313     int width, height;
 314     GetClientSize( &width, &height );
 315     if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
 316     {
 317         SetCurrent();
 318 //        gdk_window_set_back_pixmap( gtk_widget_get_parent_window(m_glWidget), None, 0 );
 319
 320         glViewport(0, 0, (GLint)width, (GLint)height );
 321         glMatrixMode(GL_PROJECTION);
 322         glLoadIdentity();
 323         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 324         glMatrixMode(GL_MODELVIEW);
 325     }
 326 }
 327
 328 void wxGLCanvas::SetCurrent()
 329 {
 330     if (m_glContext) m_glContext->SetCurrent();
 331 }
 332
 333 void wxGLCanvas::SetColour( const char *colour )
 334 {
 335     if (m_glContext) m_glContext->SetColour( colour );
 336 }
 337
 338 void wxGLCanvas::DoSetSize( int x, int y, int width, int height, int sizeFlags )
 339 {
 340     if (m_resizing) return; // I don't like recursions
 341     m_resizing = TRUE;
 342
 343     if (m_parent->m_wxwindow == NULL) // i.e. wxNotebook
 344     {
 345         // don't set the size for children of wxNotebook, just take the values.
 346         m_x = x;
 347         m_y = y;
 348         m_width = width;
 349         m_height = height;
 350     }
 351     else
 352     {
 353         int old_width = m_width;
 354         int old_height = m_height;
 355
 356         if ((sizeFlags & wxSIZE_ALLOW_MINUS_ONE) == 0)
 357         {
 358             if (x != -1) m_x = x;
 359             if (y != -1) m_y = y;
 360             if (width != -1) m_width = width;
 361             if (height != -1) m_height = height;
 362         }
 363         else
 364         {
 365             m_x = x;
 366             m_y = y;
 367             m_width = width;
 368             m_height = height;
 369         }
 370
 371         if ((sizeFlags & wxSIZE_AUTO_WIDTH) == wxSIZE_AUTO_WIDTH)
 372         {
 373              if (width == -1) m_width = 80;
 374         }
 375
 376         if ((sizeFlags & wxSIZE_AUTO_HEIGHT) == wxSIZE_AUTO_HEIGHT)
 377         {
 378              if (height == -1) m_height = 26;
 379         }
 380
 381         if ((m_minWidth != -1) && (m_width < m_minWidth)) m_width = m_minWidth;
 382         if ((m_minHeight != -1) && (m_height < m_minHeight)) m_height = m_minHeight;
 383         if ((m_maxWidth != -1) && (m_width > m_maxWidth)) m_width = m_maxWidth;
 384         if ((m_maxHeight != -1) && (m_height > m_maxHeight)) m_height = m_maxHeight;
 385
 386         gtk_myfixed_set_size( GTK_MYFIXED(m_parent->m_wxwindow),
 387                               m_widget,
 388                               m_x,
 389                               m_y,
 390                               m_width,
 391                               m_height );
 392
 393         gtk_myfixed_set_size( GTK_MYFIXED(m_wxwindow),
 394                               m_glWidget,
 395                               m_x,
 396                               m_y,
 397                               m_width,
 398                               m_height );
 399     }
 400
 401     m_sizeSet = TRUE;
 402
 403     wxSizeEvent event( wxSize(m_width,m_height), GetId() );
 404     event.SetEventObject( this );
 405     GetEventHandler()->ProcessEvent( event );
 406
 407     m_resizing = FALSE;
 408 }
 409
 410 GtkWidget *wxGLCanvas::GetConnectWidget()
 411 {
 412     return m_glWidget;
 413 }
 414
 415 bool wxGLCanvas::IsOwnGtkWindow( GdkWindow *window )
 416 {
 417     return (window == m_glWidget->window);
 418 }