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 {
  57     if (!m_glContext) return;
  58
  59     if (m_glContext == glXGetCurrentContext())
  60     {
  61         glXMakeCurrent( GDK_DISPLAY(), None, NULL);
  62     }
  63
  64     glXDestroyContext( GDK_DISPLAY(), m_glContext );
  65 }
  66
  67 void wxGLContext::SwapBuffers()
  68 {
  69     if (m_glContext)
  70     {
  71         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( m_widget->window ) );
  72     }
  73 }
  74
  75 void wxGLContext::SetCurrent()
  76 {
  77     if (m_glContext)
  78     {
  79         glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(m_widget->window), m_glContext );
  80     }
  81 }
  82
  83 void wxGLContext::SetColour(const char *colour)
  84 {
  85     float r = 0.0;
  86     float g = 0.0;
  87     float b = 0.0;
  88     wxColour *col = wxTheColourDatabase->FindColour(colour);
  89     if (col)
  90     {
  91         r = (float)(col->Red()/256.0);
  92         g = (float)(col->Green()/256.0);
  93         b = (float)(col->Blue()/256.0);
  94         glColor3f( r, g, b);
  95     }
  96 }
  97
  98 void wxGLContext::SetupPixelFormat()
  99 {
 100 }
 101
 102 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 103 {
 104 }
 105
 106 wxPalette wxGLContext::CreateDefaultPalette()
 107 {
 108     return wxNullPalette;
 109 }
 110
 111 //-----------------------------------------------------------------------------
 112 // "expose_event" of m_glWidget
 113 //-----------------------------------------------------------------------------
 114
 115 static void gtk_window_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxWindow *win )
 116 {
 117     if (!win->HasVMT()) return;
 118
 119     win->m_updateRegion.Union( gdk_event->area.x,
 120                                gdk_event->area.y,
 121                                gdk_event->area.width,
 122                                gdk_event->area.height );
 123
 124     if (gdk_event->count > 0) return;
 125
 126 /*
 127     printf( "OnExpose from " );
 128     if (win->GetClassInfo() && win->GetClassInfo()->GetClassName())
 129         printf( win->GetClassInfo()->GetClassName() );
 130     printf( ".\n" );
 131 */
 132
 133     wxPaintEvent event( win->GetId() );
 134     event.SetEventObject( win );
 135     win->GetEventHandler()->ProcessEvent( event );
 136
 137     win->m_updateRegion.Clear();
 138 }
 139
 140 //-----------------------------------------------------------------------------
 141 // "draw" of m_glWidget
 142 //-----------------------------------------------------------------------------
 143
 144 static void gtk_window_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxWindow *win )
 145 {
 146     if (!win->HasVMT()) return;
 147
 148     win->m_updateRegion.Union( rect->x, rect->y, rect->width, rect->height );
 149
 150     wxPaintEvent event( win->GetId() );
 151     event.SetEventObject( win );
 152     win->GetEventHandler()->ProcessEvent( event );
 153
 154     win->m_updateRegion.Clear();
 155 }
 156
 157 //---------------------------------------------------------------------------
 158 // wxGlCanvas
 159 //---------------------------------------------------------------------------
 160
 161 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 162
 163 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 164     EVT_SIZE(wxGLCanvas::OnSize)
 165 END_EVENT_TABLE()
 166
 167 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 168                         const wxPoint& pos, const wxSize& size,
 169                         long style, const wxString& name,
 170                         int *attribList,
 171                         const wxPalette& palette )
 172 {
 173     Create( parent, id, pos, size, style, name, attribList, palette );
 174 }
 175
 176 bool wxGLCanvas::Create( wxWindow *parent, wxWindowID id,
 177                          const wxPoint& pos, const wxSize& size,
 178                          long style, const wxString& name,
 179                          int *attribList,
 180                          const wxPalette& palette )
 181 {
 182     if (!attribList)
 183     {
 184         int data[] = { GLX_RGBA,
 185                        GLX_DOUBLEBUFFER,
 186                        GLX_DEPTH_SIZE, 1,
 187                        None };
 188         attribList = (int*) data;
 189     }
 190
 191     Display *dpy = GDK_DISPLAY();
 192
 193     g_vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 194
 195     GdkVisual *visual = gdkx_visual_get( g_vi->visualid );
 196     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(g_vi->visualid), TRUE );
 197
 198     gtk_widget_push_colormap( colormap );
 199     gtk_widget_push_visual( visual );
 200
 201     m_glWidget = gtk_myfixed_new();
 202
 203     gtk_widget_pop_visual();
 204     gtk_widget_pop_colormap();
 205
 206     wxScrolledWindow::Create( parent, id, pos, size, style, name );
 207
 208     GTK_WIDGET_UNSET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 209     GTK_WIDGET_SET_FLAGS( m_glWidget, GTK_CAN_FOCUS );
 210
 211     gtk_myfixed_put( GTK_MYFIXED(m_wxwindow), m_glWidget, 0, 0, m_width, m_height );
 212
 213     gtk_signal_connect( GTK_OBJECT(m_glWidget), "expose_event",
 214       GTK_SIGNAL_FUNC(gtk_window_expose_callback), (gpointer)this );
 215
 216     gtk_signal_connect( GTK_OBJECT(m_glWidget), "draw",
 217       GTK_SIGNAL_FUNC(gtk_window_draw_callback), (gpointer)this );
 218
 219     /* connect to key press and mouse handlers etc. */
 220     ConnectWidget( m_glWidget );
 221
 222     /* must be realized for OpenGl output */
 223     gtk_widget_realize( m_glWidget );
 224
 225     gtk_widget_show( m_glWidget );
 226
 227     m_glContext = new wxGLContext( TRUE, this, palette );
 228
 229     XFree( g_vi );
 230     g_vi = (XVisualInfo*) NULL;
 231
 232     return TRUE;
 233 }
 234
 235 wxGLCanvas::~wxGLCanvas()
 236 {
 237     if (m_glContext) delete m_glContext;
 238 }
 239
 240 void wxGLCanvas::SwapBuffers()
 241 {
 242     if (m_glContext) m_glContext->SwapBuffers();
 243 }
 244
 245 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 246 {
 247     int width, height;
 248     GetClientSize( &width, &height );
 249     if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
 250     {
 251         SetCurrent();
 252
 253         glViewport(0, 0, (GLint)width, (GLint)height );
 254         glMatrixMode(GL_PROJECTION);
 255         glLoadIdentity();
 256         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 257         glMatrixMode(GL_MODELVIEW);
 258     }
 259 }
 260
 261 void wxGLCanvas::SetCurrent()
 262 {
 263     if (m_glContext) m_glContext->SetCurrent();
 264 }
 265
 266 void wxGLCanvas::SetColour( const char *colour )
 267 {
 268     if (m_glContext) m_glContext->SetColour( colour );
 269 }
 270
 271 void wxGLCanvas::DoSetSize( int x, int y, int width, int height, int sizeFlags )
 272 {
 273     if (m_resizing) return; // I don't like recursions
 274     m_resizing = TRUE;
 275
 276     if (m_parent->m_wxwindow == NULL) // i.e. wxNotebook
 277     {
 278         // don't set the size for children of wxNotebook, just take the values.
 279         m_x = x;
 280         m_y = y;
 281         m_width = width;
 282         m_height = height;
 283     }
 284     else
 285     {
 286         int old_width = m_width;
 287         int old_height = m_height;
 288
 289         if ((sizeFlags & wxSIZE_USE_EXISTING) == wxSIZE_USE_EXISTING)
 290         {
 291             if (x != -1) m_x = x;
 292             if (y != -1) m_y = y;
 293             if (width != -1) m_width = width;
 294             if (height != -1) m_height = height;
 295         }
 296         else
 297         {
 298             m_x = x;
 299             m_y = y;
 300             m_width = width;
 301             m_height = height;
 302         }
 303
 304         if ((sizeFlags & wxSIZE_AUTO_WIDTH) == wxSIZE_AUTO_WIDTH)
 305         {
 306              if (width == -1) m_width = 80;
 307         }
 308
 309         if ((sizeFlags & wxSIZE_AUTO_HEIGHT) == wxSIZE_AUTO_HEIGHT)
 310         {
 311              if (height == -1) m_height = 26;
 312         }
 313
 314         if ((m_minWidth != -1) && (m_width < m_minWidth)) m_width = m_minWidth;
 315         if ((m_minHeight != -1) && (m_height < m_minHeight)) m_height = m_minHeight;
 316         if ((m_maxWidth != -1) && (m_width > m_maxWidth)) m_width = m_maxWidth;
 317         if ((m_maxHeight != -1) && (m_height > m_maxHeight)) m_height = m_maxHeight;
 318
 319         gtk_myfixed_set_size( GTK_MYFIXED(m_parent->m_wxwindow),
 320                               m_widget,
 321                               m_x,
 322                               m_y,
 323                               m_width,
 324                               m_height );
 325
 326         gtk_myfixed_set_size( GTK_MYFIXED(m_wxwindow),
 327                               m_glWidget,
 328                               m_x,
 329                               m_y,
 330                               m_width,
 331                               m_height );
 332     }
 333
 334     m_sizeSet = TRUE;
 335
 336     wxSizeEvent event( wxSize(m_width,m_height), GetId() );
 337     event.SetEventObject( this );
 338     GetEventHandler()->ProcessEvent( event );
 339
 340     m_resizing = FALSE;
 341 }
 342
 343 GtkWidget *wxGLCanvas::GetConnectWidget()
 344 {
 345     return m_glWidget;
 346 }
 347
 348 bool wxGLCanvas::IsOwnGtkWindow( GdkWindow *window )
 349 {
 350     return (window == m_glWidget->window);
 351 }