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 // "realize" from m_wxwindow
 133 //-----------------------------------------------------------------------------
 134
 135 static gint
 136 gtk_glwindow_realized_callback( GtkWidget * WXUNUSED(widget), wxGLCanvas *win )
 137 {
 138     win->m_glContext = new wxGLContext( TRUE, win, wxNullPalette, win->m_glContext );
 139
 140     XFree( g_vi );
 141     g_vi = (XVisualInfo*) NULL;
 142
 143     return FALSE;
 144 }
 145
 146 //---------------------------------------------------------------------------
 147 // wxGlCanvas
 148 //---------------------------------------------------------------------------
 149
 150 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 151
 152 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 153     EVT_SIZE(wxGLCanvas::OnSize)
 154 END_EVENT_TABLE()
 155
 156 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 157                         const wxPoint& pos, const wxSize& size,
 158                         long style, const wxString& name,
 159                         int *attribList,
 160                         const wxPalette& palette )
 161 {
 162     Create( parent, NULL, id, pos, size, style, name, attribList, palette );
 163 }
 164
 165 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 166                         const wxGLContext *shared,
 167                         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, shared, id, pos, size, style, name, attribList, palette );
 174 }
 175
 176 bool wxGLCanvas::Create( wxWindow *parent,
 177                          const wxGLContext *shared,
 178                          wxWindowID id,
 179                          const wxPoint& pos, const wxSize& size,
 180                          long style, const wxString& name,
 181                          int *attribList,
 182                          const wxPalette& palette)
 183 {
 184     m_glContext = (wxGLContext*)shared;  // const_cast
 185
 186     if (!attribList)
 187     {
 188         int data[] = { GLX_RGBA,
 189                        GLX_DOUBLEBUFFER,
 190                        GLX_DEPTH_SIZE, 1,  // use largest available depth buffer
 191                        GLX_RED_SIZE, 1,
 192                        GLX_GREEN_SIZE, 1,
 193                        GLX_BLUE_SIZE, 1,
 194                        GLX_ALPHA_SIZE, 0,
 195                        None };
 196         attribList = (int*) data;
 197     }
 198     else
 199     {
 200       int data[512], arg=0, p=0;
 201
 202       while( (attribList[arg]!=0) && (p<512) )
 203       {
 204         switch( attribList[arg++] )
 205         {
 206           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 207           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 208           case WX_GL_DEPTH_SIZE:
 209             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 210           case WX_GL_MIN_RED:
 211             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 212           case WX_GL_MIN_GREEN:
 213             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 214           case WX_GL_MIN_BLUE:
 215             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 216           default:
 217             break;
 218         }
 219       }
 220       data[p] = 0;
 221
 222       attribList = (int*) data;
 223     }
 224
 225
 226     Display *dpy = GDK_DISPLAY();
 227
 228     g_vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 229
 230     wxCHECK_MSG( g_vi, FALSE, "required visual couldn't be found" );
 231
 232     GdkVisual *visual = gdkx_visual_get( g_vi->visualid );
 233     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(g_vi->visualid), TRUE );
 234
 235     gtk_widget_push_colormap( colormap );
 236     gtk_widget_push_visual( visual );
 237
 238     wxScrolledWindow::Create( parent, id, pos, size, style, name );
 239
 240     m_glWidget = m_wxwindow;
 241
 242     gtk_signal_connect( GTK_OBJECT(m_glWidget), "realize",
 243                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 244     gtk_widget_pop_visual();
 245     gtk_widget_pop_colormap();
 246
 247     return TRUE;
 248 }
 249
 250 wxGLCanvas::~wxGLCanvas()
 251 {
 252     if (m_glContext) delete m_glContext;
 253 }
 254
 255 void wxGLCanvas::SwapBuffers()
 256 {
 257     if (m_glContext) m_glContext->SwapBuffers();
 258 }
 259
 260 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 261 {
 262     int width, height;
 263     GetClientSize( &width, &height );
 264
 265     if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
 266     {
 267         SetCurrent();
 268
 269         glViewport(0, 0, (GLint)width, (GLint)height );
 270         glMatrixMode(GL_PROJECTION);
 271         glLoadIdentity();
 272         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 273         glMatrixMode(GL_MODELVIEW);
 274     }
 275 }
 276
 277 void wxGLCanvas::SetCurrent()
 278 {
 279     if (m_glContext) m_glContext->SetCurrent();
 280 }
 281
 282 void wxGLCanvas::SetColour( const char *colour )
 283 {
 284     if (m_glContext) m_glContext->SetColour( colour );
 285 }
 286
 287 GtkWidget *wxGLCanvas::GetConnectWidget()
 288 {
 289     return m_wxwindow;
 290 }
 291
 292 bool wxGLCanvas::IsOwnGtkWindow( GdkWindow *window )
 293 {
 294     return (window == m_wxwindow->window);
 295 }