src/x11/glcanvas.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/x11/glcanvas.cpp
   3 // Purpose:     wxGLCanvas, for using OpenGL with wxWidgets
   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 // for compilers that support precompilation, includes "wx.h".
  14 #include "wx/wxprec.h"
  15
  16 #if defined(__BORLANDC__)
  17     #pragma hdrstop
  18 #endif
  19
  20 #if wxUSE_GLCANVAS
  21
  22 #include "wx/glcanvas.h"
  23
  24 #ifndef WX_PRECOMP
  25     #include "wx/log.h"
  26     #include "wx/app.h"
  27 #endif
  28
  29 #include "wx/utils.h"
  30
  31 #ifdef __VMS
  32 # pragma message disable nosimpint
  33 #endif
  34 #include <X11/Xlib.h>
  35 #ifdef __VMS
  36 # pragma message enable nosimpint
  37 #endif
  38 #include "wx/x11/private.h"
  39
  40 // DLL options compatibility check:
  41 #include "wx/build.h"
  42 WX_CHECK_BUILD_OPTIONS("wxGL")
  43
  44 static inline WXWindow wxGetClientAreaWindow(wxWindow* win)
  45 {
  46 #ifdef __WXMOTIF__
  47     return win->GetClientXWindow();
  48 #else
  49     return win->GetClientAreaWindow();
  50 #endif
  51 }
  52
  53 #ifdef OLD_MESA
  54 // workaround for bug in Mesa's glx.c
  55 static int bitcount( unsigned long n )
  56 {
  57     int bits;
  58     for (bits=0; n>0;)
  59     {
  60         if(n & 1) bits++;
  61         n = n >> 1;
  62     }
  63     return bits;
  64 }
  65 #endif
  66
  67 /*
  68  * GLContext implementation
  69  */
  70
  71 IMPLEMENT_CLASS(wxGLContext,wxObject)
  72
  73 wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win,
  74                           const wxPalette& WXUNUSED(palette) )
  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, wxT("invalid visual for OpenGL") );
  83
  84     m_glContext = glXCreateContext( (Display *)wxGetDisplay(), vi,
  85                                     None, GL_TRUE);
  86
  87     wxCHECK_RET( m_glContext, wxT("Couldn't create OpenGL context") );
  88 }
  89
  90 wxGLContext::wxGLContext(
  91                bool WXUNUSED(isRGB), wxWindow *win,
  92                const wxPalette& WXUNUSED(palette),
  93                const wxGLContext *other        /* for sharing display lists */
  94 )
  95 {
  96     m_window = win;
  97     // m_widget = win->m_wxwindow;
  98
  99     wxGLCanvas *gc = (wxGLCanvas*) win;
 100     XVisualInfo *vi = (XVisualInfo *) gc->m_vi;
 101
 102     wxCHECK_RET( vi, wxT("invalid visual for OpenGL") );
 103
 104     if( other != 0 )
 105         m_glContext = glXCreateContext( (Display *)wxGetDisplay(), vi,
 106                                         other->m_glContext, GL_TRUE );
 107     else
 108         m_glContext = glXCreateContext( (Display *)wxGetDisplay(), vi,
 109                                         None, GL_TRUE );
 110
 111     wxCHECK_RET( m_glContext, wxT("Couldn't create OpenGL context") );
 112 }
 113
 114 wxGLContext::~wxGLContext()
 115 {
 116     if (!m_glContext) return;
 117
 118     if (m_glContext == glXGetCurrentContext())
 119     {
 120         glXMakeCurrent( (Display*) wxGetDisplay(), None, NULL);
 121     }
 122
 123     glXDestroyContext( (Display*) wxGetDisplay(), m_glContext );
 124 }
 125
 126 void wxGLContext::SwapBuffers()
 127 {
 128     if (m_glContext)
 129     {
 130         Display* display = (Display*) wxGetDisplay();
 131         glXSwapBuffers(display, (Window) wxGetClientAreaWindow(m_window));
 132     }
 133 }
 134
 135 void wxGLContext::SetCurrent()
 136 {
 137     if (m_glContext)
 138     {
 139         Display* display = (Display*) wxGetDisplay();
 140         glXMakeCurrent(display, (Window) wxGetClientAreaWindow(m_window),
 141                        m_glContext );
 142     }
 143 }
 144
 145 void wxGLContext::SetColour(const wxChar *colour)
 146 {
 147     wxColour the_colour = wxTheColourDatabase->Find(colour);
 148     if(the_colour.Ok())
 149     {
 150         GLboolean b;
 151         glGetBooleanv(GL_RGBA_MODE, &b);
 152         if(b)
 153         {
 154             glColor3ub(the_colour.Red(),
 155                     the_colour.Green(),
 156                     the_colour.Blue());
 157         }
 158         else
 159         {
 160 #ifdef __WXMOTIF__
 161             the_colour.AllocColour(m_window->GetXDisplay());
 162 #else
 163             the_colour.CalcPixel(wxTheApp->GetMainColormap(wxGetDisplay()));
 164 #endif
 165             GLint pix = (GLint)the_colour.GetPixel();
 166             if(pix == -1)
 167             {
 168                 wxLogError(wxT("wxGLCanvas: cannot allocate color\n"));
 169                 return;
 170             }
 171             glIndexi(pix);
 172         }
 173     }
 174 }
 175
 176 void wxGLContext::SetupPixelFormat()
 177 {
 178 }
 179
 180 void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) )
 181 {
 182 }
 183
 184 wxPalette wxGLContext::CreateDefaultPalette()
 185 {
 186     return wxNullPalette;
 187 }
 188
 189
 190
 191
 192 /*
 193  * GLCanvas implementation
 194  */
 195
 196 IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow)
 197
 198 BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow)
 199 //    EVT_SIZE(wxGLCanvas::OnSize)
 200 END_EVENT_TABLE()
 201
 202
 203 wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id,
 204                         const wxPoint& pos, const wxSize& size,
 205                         long style, const wxString& name,
 206                         int *attribList,
 207                         const wxPalette& palette )
 208 : wxScrolledWindow(parent, id, pos, size, style, name)
 209 {
 210     Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette );
 211 }
 212
 213 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 214                         const wxGLContext *shared,
 215                         wxWindowID id,
 216                         const wxPoint& pos, const wxSize& size,
 217                         long style, const wxString& name,
 218                         int *attribList,
 219                         const wxPalette& palette )
 220 : wxScrolledWindow(parent, id, pos, size, style, name)
 221 {
 222     Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette );
 223 }
 224
 225 wxGLCanvas::wxGLCanvas( wxWindow *parent,
 226                         const wxGLCanvas *shared,
 227                         wxWindowID id,
 228                         const wxPoint& pos, const wxSize& size,
 229                         long style, const wxString& name,
 230                         int *attribList,
 231                         const wxPalette& palette )
 232 : wxScrolledWindow(parent, id, pos, size, style, name)
 233 {
 234     Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette );
 235 }
 236
 237
 238 /*
 239 bool wxGLCanvas::Create(wxWindow *parent,
 240   const wxGLContext *shared, const wxGLCanvas *shared_context_of,
 241   wxWindowID id = -1, const wxPoint& pos,
 242   const wxSize& size, long style,
 243   const wxString& name, int *attribList, const wxPalette& palette):
 244     wxScrolledWindow(parent, id, pos, size, style, name)
 245 */
 246
 247 bool wxGLCanvas::Create( wxWindow *parent,
 248                          const wxGLContext *shared,
 249                          const wxGLCanvas *shared_context_of,
 250                          wxWindowID id,
 251                          const wxPoint& pos, const wxSize& size,
 252                          long style, const wxString& name,
 253                          int *attribList,
 254                          const wxPalette& palette)
 255 {
 256     XVisualInfo *vi, vi_templ;
 257     XWindowAttributes xwa;
 258     int val, n;
 259
 260     m_sharedContext = (wxGLContext*)shared;  // const_cast
 261     m_sharedContextOf = (wxGLCanvas*)shared_context_of;  // const_cast
 262     m_glContext = (wxGLContext*) NULL;
 263
 264     Display* display = (Display*) wxGetDisplay();
 265
 266     // Check for the presence of the GLX extension
 267     if(!glXQueryExtension(display, NULL, NULL))
 268     {
 269         wxLogDebug(wxT("wxGLCanvas: GLX extension is missing\n"));
 270         return false;
 271     }
 272
 273     if(attribList) {
 274       int data[512], arg=0, p=0;
 275
 276       while( (attribList[arg]!=0) && (p<512) )
 277       {
 278         switch( attribList[arg++] )
 279         {
 280           case WX_GL_RGBA: data[p++] = GLX_RGBA; break;
 281           case WX_GL_BUFFER_SIZE:
 282             data[p++]=GLX_BUFFER_SIZE; data[p++]=attribList[arg++]; break;
 283           case WX_GL_LEVEL:
 284             data[p++]=GLX_LEVEL; data[p++]=attribList[arg++]; break;
 285           case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break;
 286           case WX_GL_STEREO: data[p++] = GLX_STEREO; break;
 287           case WX_GL_AUX_BUFFERS:
 288             data[p++]=GLX_AUX_BUFFERS; data[p++]=attribList[arg++]; break;
 289           case WX_GL_MIN_RED:
 290             data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break;
 291           case WX_GL_MIN_GREEN:
 292             data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 293           case WX_GL_MIN_BLUE:
 294             data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 295           case WX_GL_MIN_ALPHA:
 296             data[p++]=GLX_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 297           case WX_GL_DEPTH_SIZE:
 298             data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break;
 299           case WX_GL_STENCIL_SIZE:
 300             data[p++]=GLX_STENCIL_SIZE; data[p++]=attribList[arg++]; break;
 301           case WX_GL_MIN_ACCUM_RED:
 302             data[p++]=GLX_ACCUM_RED_SIZE; data[p++]=attribList[arg++]; break;
 303           case WX_GL_MIN_ACCUM_GREEN:
 304             data[p++]=GLX_ACCUM_GREEN_SIZE; data[p++]=attribList[arg++]; break;
 305           case WX_GL_MIN_ACCUM_BLUE:
 306             data[p++]=GLX_ACCUM_BLUE_SIZE; data[p++]=attribList[arg++]; break;
 307           case WX_GL_MIN_ACCUM_ALPHA:
 308             data[p++]=GLX_ACCUM_ALPHA_SIZE; data[p++]=attribList[arg++]; break;
 309           default:
 310             break;
 311         }
 312       }
 313       data[p] = 0;
 314
 315       attribList = (int*) data;
 316       // Get an appropriate visual
 317       vi = glXChooseVisual(display, DefaultScreen(display), attribList);
 318       if(!vi) return false;
 319
 320       // Here we should make sure that vi is the same visual as the
 321       // one used by the xwindow drawable in wxCanvas.  However,
 322       // there is currently no mechanism for this in wx_canvs.cc.
 323     } else {
 324         // By default, we use the visual of xwindow
 325         // NI: is this really senseful ? opengl in e.g. color index mode ?
 326       XGetWindowAttributes(display, (Window)wxGetClientAreaWindow(this), &xwa);
 327       vi_templ.visualid = XVisualIDFromVisual(xwa.visual);
 328       vi = XGetVisualInfo(display, VisualIDMask, &vi_templ, &n);
 329       if(!vi) return false;
 330       glXGetConfig(display, vi, GLX_USE_GL, &val);
 331       if(!val) return false;
 332       // Basically, this is it.  It should be possible to use vi
 333       // in glXCreateContext() below.  But this fails with Mesa.
 334       // I notified the Mesa author about it; there may be a fix.
 335 #ifdef OLD_MESA
 336       // Construct an attribute list matching the visual
 337       int a_list[32];
 338       n = 0;
 339       if(vi->c_class==TrueColor || vi->c_class==DirectColor) { // RGBA visual
 340           a_list[n++] = GLX_RGBA;
 341           a_list[n++] = GLX_RED_SIZE;
 342           a_list[n++] = bitcount(vi->red_mask);
 343           a_list[n++] = GLX_GREEN_SIZE;
 344           a_list[n++] = bitcount(vi->green_mask);
 345           a_list[n++] = GLX_BLUE_SIZE;
 346           a_list[n++] = bitcount(vi->blue_mask);
 347           glXGetConfig(display, vi, GLX_ALPHA_SIZE, &val);
 348           a_list[n++] = GLX_ALPHA_SIZE;
 349           a_list[n++] = val;
 350       } else { // Color index visual
 351           glXGetConfig(display, vi, GLX_BUFFER_SIZE, &val);
 352           a_list[n++] = GLX_BUFFER_SIZE;
 353           a_list[n++] = val;
 354       }
 355       a_list[n] = None;
 356       // XFree(vi);
 357       vi = glXChooseVisual(display, DefaultScreen(display), a_list);
 358       if(!vi) return false;
 359 #endif /* OLD_MESA */
 360     }
 361
 362     m_vi = vi;  // safe for later use
 363
 364     wxCHECK_MSG( m_vi, false, wxT("required visual couldn't be found") );
 365
 366     // Create the GLX context and make it current
 367
 368     wxGLContext *share= m_sharedContext;
 369     if (share==NULL && m_sharedContextOf)
 370         share = m_sharedContextOf->GetContext();
 371
 372     m_glContext = new wxGLContext( TRUE, this, wxNullPalette, share );
 373
 374 #ifndef OLD_MESA
 375     // XFree(vi);
 376 #endif
 377     SetCurrent();
 378
 379     return true;
 380 }
 381
 382 wxGLCanvas::~wxGLCanvas(void)
 383 {
 384     XVisualInfo *vi = (XVisualInfo *) m_vi;
 385
 386     if (vi) XFree( vi );
 387     if (m_glContext) delete m_glContext;
 388
 389     // Display* display = (Display*) GetXDisplay();
 390     // if(glx_cx) glXDestroyContext(display, glx_cx);
 391 }
 392
 393 void wxGLCanvas::SwapBuffers()
 394 {
 395     if( m_glContext ) m_glContext->SwapBuffers();
 396
 397     // Display* display = (Display*) GetXDisplay();
 398     // if(glx_cx) glXSwapBuffers(display, (Window) GetClientAreaWindow());
 399 }
 400
 401 void wxGLCanvas::SetCurrent()
 402 {
 403     if( m_glContext ) m_glContext->SetCurrent();
 404
 405     // Display* display = (Display*) GetXDisplay();
 406     // if(glx_cx) glXMakeCurrent(display, (Window) GetClientAreaWindow(), glx_cx);
 407 }
 408
 409 void wxGLCanvas::SetColour(const wxChar *col)
 410 {
 411     if( m_glContext ) m_glContext->SetColour(col);
 412 }
 413
 414 #endif
 415     // wxUSE_GLCANVAS