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         GdkWindow *window = GTK_MYFIXED(m_widget)->bin_window;
  92         glXSwapBuffers( GDK_DISPLAY(), GDK_WINDOW_XWINDOW( window ) );
  93     }
  94 }
  95
  96 void wxGLContext::SetCurrent()
  97 {
  98     if (m_glContext)
  99     {
 100         GdkWindow *window = GTK_MYFIXED(m_widget)->bin_window;
 101         glXMakeCurrent( GDK_DISPLAY(), GDK_WINDOW_XWINDOW(window), m_glContext );
 102     }
 103 }
 104
 105 void wxGLContext::SetColour(const char *colour)
 106 {
 107     float r = 0.0;
 108     float g = 0.0;
 109     float b = 0.0;
 110     wxColour *col = wxTheColourDatabase->FindColour(colour);
 111     if (col)
 112     {
 113         r = (float)(col->Red()/256.0);
 114         g = (float)(col->Green()/256.0);
 115         b = (float)(col->Blue()/256.0);
 116         glColor3f( r, g, b);
 117     }
 118 }
 119
 120 void wxGLContext::SetupPixelFormat()
 121 {
 122 }
 123
 124 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 125 {
 126 }
 127
 128 wxPalette wxGLContext::CreateDefaultPalette()
 129 {
 130     return wxNullPalette;
 131 }
 132
 133 //-----------------------------------------------------------------------------
 134 // "realize" from m_wxwindow
 135 //-----------------------------------------------------------------------------
 136
 137 static gint
 138 gtk_glwindow_realized_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 139 {
 140     win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, win->m_sharedContext );
 141
 142     XFree( g_vi );
 143     g_vi = (XVisualInfo*) NULL;
 144
 145     return FALSE;
 146 }
 147
 148 //-----------------------------------------------------------------------------
 149 // "expose_event" of m_wxwindow
 150 //-----------------------------------------------------------------------------
 151
 152 static void
 153 gtk_glwindow_expose_callback( GtkWidget *WXUNUSED(widget), GdkEventExpose *gdk_event, wxGLCanvas *win )
 154 {
 155     win->m_exposed = TRUE;
 156
 157     win->GetUpdateRegion().Union( gdk_event->area.x,
 158                                   gdk_event->area.y,
 159                                   gdk_event->area.width,
 160                                   gdk_event->area.height );
 161 }
 162
 163 //-----------------------------------------------------------------------------
 164 // "draw" of m_wxwindow
 165 //-----------------------------------------------------------------------------
 166
 167 static void
 168 gtk_glwindow_draw_callback( GtkWidget *WXUNUSED(widget), GdkRectangle *rect, wxGLCanvas *win )
 169 {
 170     win->m_exposed = TRUE;
 171
 172     win->GetUpdateRegion().Union( rect->x, rect->y,
 173                                   rect->width, rect->height );
 174 }
 175
 176 //---------------------------------------------------------------------------
 177 // wxGlCanvas
 178 //---------------------------------------------------------------------------
 179
 180 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 181
 182 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 183     EVT_SIZE(wxGLCanvas::OnSize)
 184 END_EVENT_TABLE()
 185
 186 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 187                         const wxPoint& pos, const wxSize& size,
 188                         long style, const wxString& name,
 189                         int *attribList,
 190                         const wxPalette& palette )
 191 {
 192     Create( parent, NULL, id, pos, size, style, name, attribList, palette );
 193 }
 194
 195 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 196                         const wxGLContext *shared,
 197                         wxWindowID id,
 198                         const wxPoint& pos, const wxSize& size,
 199                         long style, const wxString& name,
 200                         int *attribList,
 201                         const wxPalette& palette )
 202 {
 203     Create( parent, shared, id, pos, size, style, name, attribList, palette );
 204 }
 205
 206 bool wxGLCanvas::Create( wxWindow *parent,
 207                          const wxGLContext *shared,
 208                          wxWindowID id,
 209                          const wxPoint& pos, const wxSize& size,
 210                          long style, const wxString& name,
 211                          int *attribList,
 212                          const wxPalette& palette)
 213 {
 214     m_sharedContext = (wxGLContext*)shared;  // const_cast
 215
 216     m_exposed = FALSE;
 217     m_noExpose = TRUE;
 218
 219     if (!attribList)
 220     {
 221         int data[] = { GLX_RGBA,
 222                        GLX_DOUBLEBUFFER,
 223                        GLX_DEPTH_SIZE, 1,  // use largest available depth buffer
 224                        GLX_RED_SIZE, 1,
 225                        GLX_GREEN_SIZE, 1,
 226                        GLX_BLUE_SIZE, 1,
 227                        GLX_ALPHA_SIZE, 0,
 228                        None };
 229         attribList = (int*) data;
 230     }
 231     else
 232     {
 233       int data[512], arg=0, p=0;
 234
 235       while( (attribList[arg]!=0) && (p<512) )
 236       {
 237         switch( attribList[arg++] )
 238         {
 239           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 240           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 241           case WX_GL_DEPTH_SIZE:
 242             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 243           case WX_GL_MIN_RED:
 244             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 245           case WX_GL_MIN_GREEN:
 246             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 247           case WX_GL_MIN_BLUE:
 248             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 249           default:
 250             break;
 251         }
 252       }
 253       data[p] = 0;
 254
 255       attribList = (int*) data;
 256     }
 257
 258
 259     Display *dpy = GDK_DISPLAY();
 260
 261     g_vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 262
 263     wxCHECK_MSG( g_vi, FALSE, "required visual couldn't be found" );
 264
 265     GdkVisual *visual = gdkx_visual_get( g_vi->visualid );
 266     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(g_vi->visualid), TRUE );
 267
 268     gtk_widget_push_colormap( colormap );
 269     gtk_widget_push_visual( visual );
 270
 271     wxScrolledWindow::Create( parent, id, pos, size, style, name );
 272
 273     m_glWidget = m_wxwindow;
 274
 275     gtk_my_fixed_set_clear( GTK_MYFIXED(m_wxwindow), FALSE );
 276
 277     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "realize",
 278                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 279
 280     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "expose_event",
 281         GTK_SIGNAL_FUNC(gtk_glwindow_expose_callback), (gpointer)this );
 282
 283     gtk_signal_connect( GTK_OBJECT(m_wxwindow), "draw",
 284         GTK_SIGNAL_FUNC(gtk_glwindow_draw_callback), (gpointer)this );
 285
 286     gtk_widget_pop_visual();
 287     gtk_widget_pop_colormap();
 288
 289     return TRUE;
 290 }
 291
 292 wxGLCanvas::~wxGLCanvas()
 293 {
 294     if (m_glContext) delete m_glContext;
 295 }
 296
 297 void wxGLCanvas::SwapBuffers()
 298 {
 299     if (m_glContext) m_glContext->SwapBuffers();
 300 }
 301
 302 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 303 {
 304     int width, height;
 305     GetClientSize( &width, &height );
 306
 307     if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
 308     {
 309         SetCurrent();
 310
 311         glViewport(0, 0, (GLint)width, (GLint)height );
 312         glMatrixMode(GL_PROJECTION);
 313         glLoadIdentity();
 314         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 315         glMatrixMode(GL_MODELVIEW);
 316     }
 317 }
 318
 319 void wxGLCanvas::SetCurrent()
 320 {
 321     if (m_glContext) m_glContext->SetCurrent();
 322 }
 323
 324 void wxGLCanvas::SetColour( const char *colour )
 325 {
 326     if (m_glContext) m_glContext->SetColour( colour );
 327 }
 328
 329 void wxGLCanvas::OnInternalIdle()
 330 {
 331     if (m_glContext && m_exposed)
 332     {
 333         wxPaintEvent event( GetId() );
 334         event.SetEventObject( this );
 335         GetEventHandler()->ProcessEvent( event );
 336
 337         m_exposed = FALSE;
 338         GetUpdateRegion().Clear();
 339     }
 340 }