utils/glcanvas/src/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 // wxGlCanvas
 113 //---------------------------------------------------------------------------
 114
 115 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 116
 117 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 118     EVT_SIZE(wxGLCanvas::OnSize)
 119 END_EVENT_TABLE()
 120
 121 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 122                         const wxPoint& pos, const wxSize& size,
 123                         long style, const wxString& name,
 124                         int *attribList,
 125                         const wxPalette& palette )
 126 {
 127     Create( parent, id, pos, size, style, name, attribList, palette );
 128 }
 129
 130 bool wxGLCanvas::Create( wxWindow *parent, wxWindowID id,
 131                          const wxPoint& pos, const wxSize& size,
 132                          long style, const wxString& name,
 133                          int *attribList,
 134                          const wxPalette& palette )
 135 {
 136     if (!attribList)
 137     {
 138         int data[] = { GLX_RGBA,
 139                        GLX_DOUBLEBUFFER,
 140                        GLX_DEPTH_SIZE, 1,
 141                        None };
 142         attribList = (int*) data;
 143     }
 144
 145     Display *dpy = GDK_DISPLAY();
 146
 147     g_vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 148
 149     GdkVisual *visual = gdkx_visual_get( g_vi->visualid );
 150     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(g_vi->visualid), TRUE );
 151
 152     gtk_widget_push_colormap( colormap );
 153     gtk_widget_push_visual( visual );
 154
 155     m_glWidget = gtk_drawing_area_new();
 156     gtk_widget_set_events( m_glWidget,
 157       GDK_EXPOSURE_MASK |
 158       GDK_POINTER_MOTION_HINT_MASK |
 159       GDK_POINTER_MOTION_MASK   |
 160       GDK_BUTTON_MOTION_MASK    |
 161       GDK_BUTTON1_MOTION_MASK   |
 162       GDK_BUTTON2_MOTION_MASK   |
 163       GDK_BUTTON3_MOTION_MASK   |
 164       GDK_BUTTON_PRESS_MASK     |
 165       GDK_BUTTON_RELEASE_MASK   |
 166       GDK_KEY_PRESS_MASK        |
 167       GDK_KEY_RELEASE_MASK      |
 168       GDK_ENTER_NOTIFY_MASK     |
 169       GDK_LEAVE_NOTIFY_MASK );
 170
 171     gtk_widget_pop_visual();
 172     gtk_widget_pop_colormap();
 173
 174     wxScrolledWindow::Create( parent, id, pos, size, style, name );
 175
 176     gtk_myfixed_put( GTK_MYFIXED(m_wxwindow), m_glWidget, 0, 0 );
 177
 178     gtk_widget_show( m_glWidget );
 179
 180     m_glContext = new wxGLContext( TRUE, this, palette );
 181
 182     XFree( g_vi );
 183     g_vi = (XVisualInfo*) NULL;
 184
 185     return TRUE;
 186 }
 187
 188 wxGLCanvas::~wxGLCanvas()
 189 {
 190     if (m_glContext) delete m_glContext;
 191 }
 192
 193 void wxGLCanvas::SwapBuffers()
 194 {
 195     if (m_glContext) m_glContext->SwapBuffers();
 196 }
 197
 198 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 199 {
 200     int width, height;
 201     GetClientSize( &width, &height );
 202     if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
 203     {
 204         SetCurrent();
 205
 206         glViewport(0, 0, (GLint)width, (GLint)height );
 207         glMatrixMode(GL_PROJECTION);
 208         glLoadIdentity();
 209         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 210         glMatrixMode(GL_MODELVIEW);
 211     }
 212 }
 213
 214 void wxGLCanvas::SetCurrent()
 215 {
 216     if (m_glContext) m_glContext->SetCurrent();
 217 }
 218
 219 void wxGLCanvas::SetColour( const char *colour )
 220 {
 221     if (m_glContext) m_glContext->SetColour( colour );
 222 }
 223
 224 void wxGLCanvas::SetSize( int x, int y, int width, int height, int sizeFlags )
 225 {
 226     if (m_resizing) return; // I don't like recursions
 227     m_resizing = TRUE;
 228
 229     if (m_parent->m_wxwindow == NULL) // i.e. wxNotebook
 230     {
 231         // don't set the size for children of wxNotebook, just take the values.
 232         m_x = x;
 233         m_y = y;
 234         m_width = width;
 235         m_height = height;
 236     }
 237     else
 238     {
 239         int old_width = m_width;
 240         int old_height = m_height;
 241
 242         if ((sizeFlags & wxSIZE_USE_EXISTING) == wxSIZE_USE_EXISTING)
 243         {
 244             if (x != -1) m_x = x;
 245             if (y != -1) m_y = y;
 246             if (width != -1) m_width = width;
 247             if (height != -1) m_height = height;
 248         }
 249         else
 250         {
 251             m_x = x;
 252             m_y = y;
 253             m_width = width;
 254             m_height = height;
 255         }
 256
 257         if ((sizeFlags & wxSIZE_AUTO_WIDTH) == wxSIZE_AUTO_WIDTH)
 258         {
 259              if (width == -1) m_width = 80;
 260         }
 261
 262         if ((sizeFlags & wxSIZE_AUTO_HEIGHT) == wxSIZE_AUTO_HEIGHT)
 263         {
 264              if (height == -1) m_height = 26;
 265         }
 266
 267         if ((m_minWidth != -1) && (m_width < m_minWidth)) m_width = m_minWidth;
 268         if ((m_minHeight != -1) && (m_height < m_minHeight)) m_height = m_minHeight;
 269         if ((m_maxWidth != -1) && (m_width > m_maxWidth)) m_width = m_maxWidth;
 270         if ((m_maxHeight != -1) && (m_height > m_maxHeight)) m_height = m_maxHeight;
 271
 272         wxPoint pt( m_parent->GetClientAreaOrigin() );
 273         gtk_myfixed_move( GTK_MYFIXED(m_parent->m_wxwindow), m_widget, m_x+pt.x, m_y+pt.y );
 274
 275         if ((old_width != m_width) || (old_height != m_height))
 276         {
 277             gtk_widget_set_usize( m_widget, m_width, m_height );
 278
 279             gtk_drawing_area_size( GTK_DRAWING_AREA(m_glWidget), m_width, m_height );
 280
 281             GtkAllocation allo;
 282             allo.x = 0;
 283             allo.y = 0;
 284             allo.width = m_width;
 285             allo.height = m_height;
 286             gtk_widget_size_allocate( m_glWidget, &allo );
 287         }
 288     }
 289
 290     m_sizeSet = TRUE;
 291
 292     wxSizeEvent event( wxSize(m_width,m_height), GetId() );
 293     event.SetEventObject( this );
 294     GetEventHandler()->ProcessEvent( event );
 295
 296     m_resizing = FALSE;
 297 }
 298
 299 void wxGLCanvas::SetSize( int width, int height )
 300 {
 301     SetSize( -1, -1, width, height, wxSIZE_USE_EXISTING );
 302 }
 303
 304 GtkWidget *wxGLCanvas::GetConnectWidget()
 305 {
 306     return m_glWidget;
 307 }
 308
 309 bool wxGLCanvas::IsOwnGtkWindow( GdkWindow *window )
 310 {
 311     return (window == m_glWidget->window);
 312 }