Hi,

I have a strange problem with my qt application. I have a custom QGLWidget which get a stream video from a camera. Like this:
sans.jpg

Ans as soon i put an other widget in an other layout, my custom widget stop rendering. Like this:
avec.png

And i got the error :
Qt Code: 
  1. QOpenGLContext::swapBuffers() called with non-exposed window, behaviour is undefined.
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Here is the code of my custom widget:
Qt Code: 
  1. #include "widget.h"
  2. #include "ui_widget.h"
  3.  
  4. Widget::Widget(QWidget *parent) :
  5.     QGLWidget(parent),
  6.     ui(new Ui::Widget)
  7. {
  8.     ui->setupUi(this);
  9. }
  10.  
  11. Widget::~Widget()
  12. {
  13.     wglMakeCurrent(GetDC((HWND)this->winId()), this->contextGL);
  14.     cu.ClearProcess(nvGl.m_videoBuffer);
  15.     nvGl.cleanupVideo(GetDC((HWND)this->winId()));
  16.     delete ui;
  17. }
  18.  
  19. void Widget::initializeGL(){
  20.     glewInit();
  21.     rec = Recorder();
  22.     this->contextGL =wglGetCurrentContext();
  23.     nvC = NVConfig();
  24.     nvC.GlobalInit();
  25.     nvGl = NVGL(nvC.l_vioConfig,GetDC((HWND)this->winId()));
  26.     cu= CUGL();
  27.     cu.InitProcess(nvGl.m_videoBuffer);
  28.     QTimer::singleShot(16,this,SLOT(Tick()));
  29. }
  30.  
  31. void Widget::resizeGL(int w, int h){
  32.     this->resize(w,h);
  33.     if(h==0)
  34.         h =1;
  35.     glViewport(0,0,w,h);
  36.     glMatrixMode(GL_PROJECTION);
  37.     glLoadIdentity();
  38.     perspectiveGL(45.0f,w/h,0.1f,100.0f);
  39.     glMatrixMode(GL_MODELVIEW);
  40.     glLoadIdentity();
  41.  
  42. }
  43. void  Widget::Tick(){
  44.         nvC.DetectIStatus();
  45.         nvC.setCaptureDevice();
  46.         nvGl.StartCapture();
  47.         cu.ProcessVideo(nvGl.m_videoBuffer);
  48.         rec.RecordShot(nvGl.m_videoTexture);
  49.         paintGL();
  50.  
  51.     QTimer::singleShot(16,this,SLOT(Tick()));
  52. }
  53.  
  54. void Widget::paintGL(){
  55.     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  56.  
  57.     glLoadIdentity();
  58.     glTranslatef(-0.5f,-.5f,-1.1f);
  59.     glBegin(GL_QUADS);
  60.     glTexCoord2f(0,0);
  61.     glVertex3f(0,0,0);
  62.     glTexCoord2f(0,1.0f);
  63.     glVertex3f(0,1.0f,0);
  64.     glTexCoord2f(1.0f,1.0f);
  65.     glVertex3f(1.0f,1.0f,0);
  66.     glTexCoord2f(1.0f,0);
  67.     glVertex3f(1.0f,0,0);
  68.     glEnd();
  69. }
  70. void Widget::Record(){
  71.     rec.Start_StopRecord(nvGl.m_videoTexture);
  72. }
  73.  
  74.  
  75. void Widget::perspectiveGL(GLdouble fovY, GLdouble aspect, GLdouble zNear, GLdouble zFar){
  76.     const GLdouble pi = 3.1415926535897932384626433832795;
  77.     GLdouble fW, fH;
  78.     fH = tan( fovY / 360 * pi) * zNear;
  79.     fW = fH * aspect;
  80.     glFrustum( -fW,fW,-fH,fH,zNear,zFar);
  81. }
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If you have any idea.
thanks in advance