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     return FALSE;
 141 }
 142
 143 //---------------------------------------------------------------------------
 144 // wxGlCanvas
 145 //---------------------------------------------------------------------------
 146
 147 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 148
 149 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 150     EVT_SIZE(wxGLCanvas::OnSize)
 151 END_EVENT_TABLE()
 152
 153 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 154                         const wxPoint& pos, const wxSize& size,
 155                         long style, const wxString& name,
 156                         int *attribList,
 157                         const wxPalette& palette )
 158 {
 159     Create( parent, NULL, id, pos, size, style, name, attribList, palette );
 160 }
 161
 162 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 163                         const wxGLContext *shared,
 164                         wxWindowID id,
 165                         const wxPoint& pos, const wxSize& size,
 166                         long style, const wxString& name,
 167                         int *attribList,
 168                         const wxPalette& palette )
 169 {
 170     Create( parent, shared, id, pos, size, style, name, attribList, palette );
 171 }
 172
 173 bool wxGLCanvas::Create( wxWindow *parent,
 174                          const wxGLContext *shared,
 175                          wxWindowID id,
 176                          const wxPoint& pos, const wxSize& size,
 177                          long style, const wxString& name,
 178                          int *attribList,
 179                          const wxPalette& palette)
 180 {
 181     m_glContext = (wxGLContext*)shared;  // const_cast
 182
 183     if (!attribList)
 184     {
 185         int data[] = { GLX_RGBA,
 186                        GLX_DOUBLEBUFFER,
 187                        GLX_DEPTH_SIZE, 1,  // use largest available depth buffer
 188                        GLX_RED_SIZE, 1,
 189                        GLX_GREEN_SIZE, 1,
 190                        GLX_BLUE_SIZE, 1,
 191                        GLX_ALPHA_SIZE, 0,
 192                        None };
 193         attribList = (int*) data;
 194     }
 195     else
 196     {
 197       int data[512], arg=0, p=0;
 198
 199       while( (attribList[arg]!=0) && (p<512) )
 200       {
 201         switch( attribList[arg++] )
 202         {
 203           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 204           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 205           case WX_GL_DEPTH_SIZE:
 206             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 207           case WX_GL_MIN_RED:
 208             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 209           case WX_GL_MIN_GREEN:
 210             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 211           case WX_GL_MIN_BLUE:
 212             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 213           default:
 214             break;
 215         }
 216       }
 217       data[p] = 0;
 218
 219       attribList = (int*) data;
 220     }
 221
 222
 223     Display *dpy = GDK_DISPLAY();
 224
 225     g_vi = glXChooseVisual( dpy, DefaultScreen(dpy), attribList );
 226
 227     wxCHECK_MSG( g_vi, FALSE, "required visual couldn't be found" );
 228
 229     GdkVisual *visual = gdkx_visual_get( g_vi->visualid );
 230     GdkColormap *colormap = gdk_colormap_new( gdkx_visual_get(g_vi->visualid), TRUE );
 231
 232     gtk_widget_push_colormap( colormap );
 233     gtk_widget_push_visual( visual );
 234
 235     wxScrolledWindow::Create( parent, id, pos, size, style, name );
 236
 237     m_glWidget = m_wxwindow;
 238
 239     gtk_signal_connect( GTK_OBJECT(m_glWidget), "realize",
 240                             GTK_SIGNAL_FUNC(gtk_glwindow_realized_callback), (gpointer) this );
 241     gtk_widget_pop_visual();
 242     gtk_widget_pop_colormap();
 243
 244     /* must be realized for OpenGl output */
 245     gtk_widget_realize( m_glWidget );
 246
 247     XFree( g_vi );
 248     g_vi = (XVisualInfo*) NULL;
 249
 250     return TRUE;
 251 }
 252
 253 wxGLCanvas::~wxGLCanvas()
 254 {
 255     if (m_glContext) delete m_glContext;
 256 }
 257
 258 void wxGLCanvas::SwapBuffers()
 259 {
 260     if (m_glContext) m_glContext->SwapBuffers();
 261 }
 262
 263 void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
 264 {
 265     int width, height;
 266     GetClientSize( &width, &height );
 267
 268     if (m_glContext && GTK_WIDGET_REALIZED(m_glWidget) )
 269     {
 270         SetCurrent();
 271
 272         glViewport(0, 0, (GLint)width, (GLint)height );
 273         glMatrixMode(GL_PROJECTION);
 274         glLoadIdentity();
 275         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
 276         glMatrixMode(GL_MODELVIEW);
 277     }
 278 }
 279
 280 void wxGLCanvas::SetCurrent()
 281 {
 282     if (m_glContext) m_glContext->SetCurrent();
 283 }
 284
 285 void wxGLCanvas::SetColour( const char *colour )
 286 {
 287     if (m_glContext) m_glContext->SetColour( colour );
 288 }
 289
 290 GtkWidget *wxGLCanvas::GetConnectWidget()
 291 {
 292     return m_wxwindow;
 293 }
 294
 295 bool wxGLCanvas::IsOwnGtkWindow( GdkWindow *window )
 296 {
 297     return (window == m_wxwindow->window);
 298 }