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