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