OpenGL texture on QGraphicsScene background

[Ovnan]

Hello!

I try to draw texture on QGraphicsScene background. QGraphicsView object has QGLWidget object as the viewport.
Reimplemented QGraphicsScene::drawBackground function is:

void OWorkspaceScene::drawBackground(QPainter *painter, const QRectF &rect)
{
  GLuint texture[1];
  QImage t, b;
 
  b.load("../images/image.bmp");  // image size 256x256
 
  t = QGLWidget::convertToGLFormat(b);
  glGenTextures(1, texture);
  glBindTexture(GL_TEXTURE_2D, texture[0]);
  glTexImage2D(GL_TEXTURE_2D, 0, 3, t.width(), t.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, t.bits());
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 
  glEnable(GL_TEXTURE_2D);
 
  glClearColor(1, 1, 1, 1);
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
  glBegin(GL_QUADS);
  glTexCoord2f(0, 0);
  glVertex2f(0, 0);
  glTexCoord2f(0, 255);
  glVertex2f(0, 255);
  glTexCoord2f(255, 255);
  glVertex2f(255, 255);
  glTexCoord2f(255, 0);
  glVertex2f(255, 0);
  glEnd();
 
  glFinish();
}

void OWorkspaceScene::drawBackground(QPainter *painter, const QRectF &rect)
{
  GLuint texture[1];
  QImage t, b;
  
  b.load("../images/image.bmp");  // image size 256x256
  
  t = QGLWidget::convertToGLFormat(b);
  glGenTextures(1, texture);
  glBindTexture(GL_TEXTURE_2D, texture[0]);
  glTexImage2D(GL_TEXTURE_2D, 0, 3, t.width(), t.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, t.bits());
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

  glEnable(GL_TEXTURE_2D);
  
  glClearColor(1, 1, 1, 1);
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
  glBegin(GL_QUADS);
  glTexCoord2f(0, 0);
  glVertex2f(0, 0);
  glTexCoord2f(0, 255);
  glVertex2f(0, 255);
  glTexCoord2f(255, 255);
  glVertex2f(255, 255);
  glTexCoord2f(255, 0);
  glVertex2f(255, 0);
  glEnd();
  
  glFinish();
}

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As a result i have grey square nice image instead.
When i draw color square (without texture), it works fine.
I work using QT-4.3.1 under Visual Studio 2005.

What do i do wrong?