Hello everyone

I try to set up custom opengl context on Widget, but i run into X Error
Qt Code: 
  1. X Error: BadMatch (invalid parameter attributes) 8
  2.   Extension:    135 (Uknown extension)
  3.   Minor opcode: 5 (Unknown request)
  4.   Resource id:  0x4400003
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I think that this could be problem with colormap, because default window colormap could be created based on different frame buffer than frame buffer used to created context.
I don't know how change colormap attached to window, can anyone help please?

Some code below:

Qt Code: 
  1. typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
  2.  
  3. Widget::Widget(QWidget *parent) :
  4.     QWidget(parent)
  5. {    
  6.     this->setAutoFillBackground(false);
  7.     this->setAttribute(Qt::WA_OpaquePaintEvent);
  8.     this->setAttribute(Qt::WA_NoSystemBackground);
  9.     this->setAttribute(Qt::WA_NativeWindow);
  10.     this->setAttribute(Qt::WA_PaintOnScreen, true);
  11.     this->setAttribute(Qt::WA_StyledBackground, false);
  12.     this->setAttribute(Qt::WA_PaintUnclipped);
  13.  
  14.    this->xInfo = this->x11Info();
  15.  
  16.     this->findBestFrameBuffer();
  17.  
  18.     GLXContext context = 0;
  19.  
  20.     glXCreateContextAttribsARBProc glXCreateContextAttribsARB = 0;
  21.     glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc)glXGetProcAddressARB( (const GLubyte *) "glXCreateContextAttribsARB" );
  22.  
  23.     int contextAttribs[] =
  24.     {
  25.         GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
  26.         GLX_CONTEXT_MINOR_VERSION_ARB, 3,
  27.         //GLX_CONTEXT_FLAGS_ARB        , GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
  28.         None
  29.     };
  30.  
  31.  
  32.     context = glXCreateContextAttribsARB(this->xInfo.display(), this->fbConfig, 0, True, contextAttribs);
  33.     qDebug("context %p ", context);
  34.  
  35.  
  36.     glXMakeCurrent(this->xInfo.display(), this->winId(), context);
  37. }
  38.  
  39. void Widget::findBestFrameBuffer()
  40. {
  41.     static int visualAttribs[] =
  42.     {
  43.           GLX_X_RENDERABLE    , True,
  44.           GLX_DRAWABLE_TYPE   , GLX_WINDOW_BIT,
  45.           GLX_RENDER_TYPE     , GLX_RGBA_BIT,
  46.           GLX_X_VISUAL_TYPE   , GLX_TRUE_COLOR,
  47.           GLX_RED_SIZE        , 8,
  48.           GLX_GREEN_SIZE      , 8,
  49.           GLX_BLUE_SIZE       , 8,
  50.           GLX_ALPHA_SIZE      , 8,
  51.           GLX_DEPTH_SIZE      , 24,
  52.           GLX_STENCIL_SIZE    , 8,
  53.           GLX_DOUBLEBUFFER    , True,
  54.           //GLX_SAMPLE_BUFFERS  , 1,
  55.           //GLX_SAMPLES         , 4,
  56.           None
  57.     };
  58.     int fbCount = 0;
  59.  
  60.     GLXFBConfig* fbConfigsList = glXChooseFBConfig(this->xInfo.display(), this->xInfo.screen(), visualAttribs, &fbCount);
  61.  
  62.     qDebug("%i frame buffers found", fbCount);
  63.  
  64.     int bestFbCfg = -1;
  65.     int worstFbCfg = -1;
  66.     int bestNumberOfSamples = -1;
  67.     int worstNumberOfSamples = 999;
  68.     XVisualInfo* visualInfo = NULL;
  69.     int sampleBuffers = 0;
  70.     int samples = 0;
  71.  
  72.     for( int i = 0 ; i < fbCount ; i++ )
  73.     {
  74.         visualInfo = glXGetVisualFromFBConfig(this->xInfo.display(), fbConfigsList[i]);
  75.  
  76.         if( visualInfo != NULL )
  77.         {
  78.             glXGetFBConfigAttrib(this->xInfo.display(), fbConfigsList[i], GLX_SAMPLE_BUFFERS, &sampleBuffers);
  79.             glXGetFBConfigAttrib(this->xInfo.display(), fbConfigsList[i], GLX_SAMPLES, &samples);
  80.  
  81.             qDebug("\t matching %i fbCOnfig, visualId %p sampleBUffers %i samples %i", i+1, visualInfo->visualid, sampleBuffers, samples);
  82.  
  83.             if( bestFbCfg < 0 || sampleBuffers && samples > bestNumberOfSamples )
  84.             {
  85.                 bestFbCfg = i;
  86.                 bestNumberOfSamples = samples;
  87.             }
  88.  
  89.             if( worstFbCfg < 0 || !sampleBuffers | samples < worstNumberOfSamples )
  90.             {
  91.                 worstFbCfg = i;
  92.                 worstNumberOfSamples = samples;
  93.              }
  94.  
  95.          }
  96.  
  97.          XFree(visualInfo);
  98.     }
  99.  
  100.     qDebug("best fb %i worst fb %i", bestFbCfg+1, worstFbCfg+1);
  101.  
  102.     this->fbConfig = fbConfigsList[bestFbCfg];
  103.     XFree(fbConfigsList);
  104. }
  105.  
  106. void Widget::paintEvent(QPaintEvent *)
  107. {
  108.  
  109. }
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Regards