src/x11/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        glcanvas.cpp
   3 // Purpose:     wxGLCanvas, for using OpenGL with wxWindows 2.0 for Motif.
   4 //              Uses the GLX extension.
   5 // Author:      Julian Smart and Wolfram Gloger
   6 // Modified by:
   7 // Created:     1995, 1999
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) Julian Smart, Wolfram Gloger
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 #ifdef __GNUG__
  14 #pragma implementation "glcanvas.h"
  15 #endif
  16
  17 #include "wx/setup.h"
  18
  19 #if wxUSE_GLCANVAS
  20
  21 #include "wx/glcanvas.h"
  22 #include "wx/utils.h"
  23 #include "wx/app.h"
  24 #include "wx/log.h"
  25
  26 #ifdef __VMS
  27 # pragma message disable nosimpint
  28 #endif
  29 #include <Xm/Xm.h>
  30 #ifdef __VMS
  31 # pragma message enable nosimpint
  32 #endif
  33 #include "wx/motif/private.h"
  34
  35 #ifdef OLD_MESA
  36 // workaround for bug in Mesa's glx.c
  37 static int bitcount( unsigned long n )
  38 {
  39     int bits;
  40     for (bits=0; n>0;) {
  41         if(n & 1) bits++;
  42         n = n >> 1;
  43     }
  44     return bits;
  45 }
  46 #endif
  47
  48 /*
  49  * GLContext implementation
  50  */
  51
  52 IMPLEMENT_CLASS(wxGLContext,wxObject)
  53
  54 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win,
  55                           const wxPalette& WXUNUSED(palette) )
  56 {
  57     m_window = win;
  58     // m_widget = win->m_wxwindow;
  59
  60     wxGLCanvas *gc = (wxGLCanvas*) win;
  61     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  62
  63     wxCHECK_RET( vi, "invalid visual for OpenGl" );
  64
  65     m_glContext = glXCreateContext( (Display *)wxGetDisplay(), vi,
  66                                     None, GL_TRUE);
  67
  68     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  69 }
  70
  71 wxGLContext::wxGLContext(
  72                bool WXUNUSED(isRGB), wxWindow *win,
  73                const wxPalette& WXUNUSED(palette),
  74                const wxGLContext *other        /* for sharing display lists */
  75 )
  76 {
  77     m_window = win;
  78     // m_widget = win->m_wxwindow;
  79
  80     wxGLCanvas *gc = (wxGLCanvas*) win;
  81     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
  82
  83     wxCHECK_RET( vi, "invalid visual for OpenGl" );
  84
  85     if( other != 0 )
  86         m_glContext = glXCreateContext( (Display *)wxGetDisplay(), vi,
  87                                         other->m_glContext, GL_TRUE );
  88     else
  89         m_glContext = glXCreateContext( (Display *)wxGetDisplay(), vi,
  90                                         None, GL_TRUE );
  91
  92     wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" );
  93 }
  94
  95 wxGLContext::~wxGLContext()
  96 {
  97     if (!m_glContext) return;
  98
  99     if (m_glContext == glXGetCurrentContext())
 100     {
 101         glXMakeCurrent( (Display*) wxGetDisplay(), None, NULL);
 102     }
 103
 104     glXDestroyContext( (Display*) wxGetDisplay(), m_glContext );
 105 }
 106
 107 void wxGLContext::SwapBuffers()
 108 {
 109     if (m_glContext)
 110     {
 111         Display* display = (Display*) wxGetDisplay();
 112         glXSwapBuffers(display, (Window) m_window->GetClientAreaWindow());
 113     }
 114 }
 115
 116 void wxGLContext::SetCurrent()
 117 {
 118     if (m_glContext)
 119     {
 120         Display* display = (Display*) wxGetDisplay();
 121         glXMakeCurrent(display, (Window) m_window->GetClientAreaWindow(),
 122                        m_glContext );;
 123     }
 124 }
 125
 126 void wxGLContext::SetColour(const char *colour)
 127 {
 128     wxColour *the_colour = wxTheColourDatabase->FindColour(colour);
 129     if(the_colour) {
 130         GLboolean b;
 131         glGetBooleanv(GL_RGBA_MODE, &b);
 132         if(b) {
 133             glColor3ub(the_colour->Red(),
 134                        the_colour->Green(),
 135                        the_colour->Blue());
 136         } else {
 137             the_colour->CalcPixel(wxTheApp->GetMainColormap(wxGetDisplay()));
 138             GLint pix = (GLint)the_colour->GetPixel();
 139             if(pix == -1)
 140             {
 141                 wxLogError("wxGLCanvas: cannot allocate color\n");
 142                 return;
 143             }
 144             glIndexi(pix);
 145         }
 146     }
 147 }
 148
 149 void wxGLContext::SetupPixelFormat()
 150 {
 151 }
 152
 153 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 154 {
 155 }
 156
 157 wxPalette wxGLContext::CreateDefaultPalette()
 158 {
 159     return wxNullPalette;
 160 }
 161
 162
 163
 164
 165 /*
 166  * GLCanvas implementation
 167  */
 168
 169 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 170
 171 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 172 //    EVT_SIZE(wxGLCanvas::OnSize)
 173 END_EVENT_TABLE()
 174
 175
 176 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 177                         const wxPoint& pos, const wxSize& size,
 178                         long style, const wxString& name,
 179                         int *attribList,
 180                         const wxPalette& palette )
 181 : wxScrolledWindow(parent, id, pos, size, style, name)
 182 {
 183     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 184 }
 185
 186 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 187                         const wxGLContext *shared,
 188                         wxWindowID id,
 189                         const wxPoint& pos, const wxSize& size,
 190                         long style, const wxString& name,
 191                         int *attribList,
 192                         const wxPalette& palette )
 193 : wxScrolledWindow(parent, id, pos, size, style, name)
 194 {
 195     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 196 }
 197
 198 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 199                         const wxGLCanvas *shared,
 200                         wxWindowID id,
 201                         const wxPoint& pos, const wxSize& size,
 202                         long style, const wxString& name,
 203                         int *attribList,
 204                         const wxPalette& palette )
 205 : wxScrolledWindow(parent, id, pos, size, style, name)
 206 {
 207     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 208 }
 209
 210
 211 /*
 212 bool wxGLCanvas::Create(wxWindow *parent,
 213   const wxGLContext *shared, const wxGLCanvas *shared_context_of,
 214   wxWindowID id = -1, const wxPoint& pos,
 215   const wxSize& size, long style,
 216   const wxString& name, int *attribList, const wxPalette& palette):
 217     wxScrolledWindow(parent, id, pos, size, style, name)
 218 */
 219
 220 bool wxGLCanvas::Create( wxWindow *parent,
 221                          const wxGLContext *shared,
 222                          const wxGLCanvas *shared_context_of,
 223                          wxWindowID id,
 224                          const wxPoint& pos, const wxSize& size,
 225                          long style, const wxString& name,
 226                          int *attribList,
 227                          const wxPalette& palette)
 228 {
 229     XVisualInfo *vi, vi_templ;
 230     XWindowAttributes xwa;
 231     int val, n;
 232
 233     m_sharedContext = (wxGLContext*)shared;  // const_cast
 234     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 235     m_glContext = (wxGLContext*) NULL;
 236
 237     Display* display = (Display*) wxGetDisplay();
 238
 239     // Check for the presence of the GLX extension
 240     if(!glXQueryExtension(display, NULL, NULL)) {
 241         wxLogDebug("wxGLCanvas: GLX extension is missing\n");
 242         return FALSE;
 243     }
 244
 245     if(attribList) {
 246       int data[512], arg=0, p=0;
 247
 248       while( (attribList[arg]!=0) && (p<512) )
 249       {
 250         switch( attribList[arg++] )
 251         {
 252           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 253           case WX_GL_BUFFER_SIZE:
 254             data[p++]=GLX_BUFFER_SIZE; data[p++]=attribList[arg++]; break;
 255           case WX_GL_LEVEL:
 256             data[p++]=GLX_LEVEL; data[p++]=attribList[arg++]; break;
 257           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 258           case WX_GL_STEREO: data[p++] = GLX_STEREO; break;
 259           case WX_GL_AUX_BUFFERS:
 260             data[p++]=GLX_AUX_BUFFERS; data[p++]=attribList[arg++]; break;
 261           case WX_GL_MIN_RED:
 262             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 263           case WX_GL_MIN_GREEN:
 264             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 265           case WX_GL_MIN_BLUE:
 266             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 267           case WX_GL_MIN_ALPHA:
 268             data[p++]=GLX_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 269           case WX_GL_DEPTH_SIZE:
 270             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 271           case WX_GL_STENCIL_SIZE:
 272             data[p++]=GLX_STENCIL_SIZE; data[p++]=attribList[arg++]; break;
 273           case WX_GL_MIN_ACCUM_RED:
 274             data[p++]=GLX_ACCUM_RED_SIZE; data[p++]=attribList[arg++]; break;
 275           case WX_GL_MIN_ACCUM_GREEN:
 276             data[p++]=GLX_ACCUM_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 277           case WX_GL_MIN_ACCUM_BLUE:
 278             data[p++]=GLX_ACCUM_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 279           case WX_GL_MIN_ACCUM_ALPHA:
 280             data[p++]=GLX_ACCUM_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 281           default:
 282             break;
 283         }
 284       }
 285       data[p] = 0;
 286
 287       attribList = (int*) data;
 288       // Get an appropriate visual
 289       vi = glXChooseVisual(display, DefaultScreen(display), attribList);
 290       if(!vi) return FALSE;
 291
 292       // Here we should make sure that vi is the same visual as the
 293       // one used by the xwindow drawable in wxCanvas.  However,
 294       // there is currently no mechanism for this in wx_canvs.cc.
 295     } else {
 296         // By default, we use the visual of xwindow
 297         // NI: is this really senseful ? opengl in e.g. color index mode ?
 298         XGetWindowAttributes(display, (Window) GetClientAreaWindow(), &xwa);
 299         vi_templ.visualid = XVisualIDFromVisual(xwa.visual);
 300         vi = XGetVisualInfo(display, VisualIDMask, &vi_templ, &n);
 301         if(!vi) return FALSE;
 302         glXGetConfig(display, vi, GLX_USE_GL, &val);
 303         if(!val) return FALSE;
 304         // Basically, this is it.  It should be possible to use vi
 305         // in glXCreateContext() below.  But this fails with Mesa.
 306         // I notified the Mesa author about it; there may be a fix.
 307 #ifdef OLD_MESA
 308         // Construct an attribute list matching the visual
 309         int a_list[32];
 310         n = 0;
 311         if(vi->c_class==TrueColor || vi->c_class==DirectColor) { // RGBA visual
 312             a_list[n++] = GLX_RGBA;
 313             a_list[n++] = GLX_RED_SIZE;
 314             a_list[n++] = bitcount(vi->red_mask);
 315             a_list[n++] = GLX_GREEN_SIZE;
 316             a_list[n++] = bitcount(vi->green_mask);
 317             a_list[n++] = GLX_BLUE_SIZE;
 318             a_list[n++] = bitcount(vi->blue_mask);
 319             glXGetConfig(display, vi, GLX_ALPHA_SIZE, &val);
 320             a_list[n++] = GLX_ALPHA_SIZE;
 321             a_list[n++] = val;
 322         } else { // Color index visual
 323             glXGetConfig(display, vi, GLX_BUFFER_SIZE, &val);
 324             a_list[n++] = GLX_BUFFER_SIZE;
 325             a_list[n++] = val;
 326         }
 327         a_list[n] = None;
 328         // XFree(vi);
 329         vi = glXChooseVisual(display, DefaultScreen(display), a_list);
 330         if(!vi) return FALSE;
 331 #endif /* OLD_MESA */
 332     }
 333
 334     m_vi = vi;  // safe for later use
 335
 336     wxCHECK_MSG( m_vi, FALSE, "required visual couldn't be found" );
 337
 338     // Create the GLX context and make it current
 339
 340     wxGLContext *share= m_sharedContext;
 341     if (share==NULL && m_sharedContextOf)
 342         share = m_sharedContextOf->GetContext();
 343
 344     m_glContext = new wxGLContext( TRUE, this, wxNullPalette, share );
 345
 346 #ifndef OLD_MESA
 347     // XFree(vi);
 348 #endif
 349     SetCurrent();
 350
 351     return TRUE;
 352 }
 353
 354 wxGLCanvas::~wxGLCanvas(void)
 355 {
 356     XVisualInfo *vi = (XVisualInfo *) m_vi;
 357
 358     if (vi) XFree( vi );
 359     if (m_glContext) delete m_glContext;
 360
 361     // Display* display = (Display*) GetXDisplay();
 362     // if(glx_cx) glXDestroyContext(display, glx_cx);
 363 }
 364
 365 void wxGLCanvas::SwapBuffers()
 366 {
 367     if( m_glContext ) m_glContext->SwapBuffers();
 368
 369     // Display* display = (Display*) GetXDisplay();
 370     // if(glx_cx) glXSwapBuffers(display, (Window) GetClientAreaWindow());
 371 }
 372
 373 void wxGLCanvas::SetCurrent()
 374 {
 375     if( m_glContext ) m_glContext->SetCurrent();
 376
 377     // Display* display = (Display*) GetXDisplay();
 378     // if(glx_cx) glXMakeCurrent(display, (Window) GetClientAreaWindow(), glx_cx);
 379 }
 380
 381 void wxGLCanvas::SetColour(const char *col)
 382 {
 383     if( m_glContext ) m_glContext->SetColour(col);
 384 }
 385
 386 #endif
 387     // wxUSE_GLCANVAS
 388