OpenGL texture on QGraphicsScene background

Hello!

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

Code:

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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?

Have you checked that the path to the image is correct and that the image gets loaded?

BTW. Using Qt methods for binding the texture might be a bit less error prone, i.e.

Code:

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bindTexture(QPixmap(":/images/side.png"), GL_TEXTURE_2D);

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Quote:

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Originally Posted by wysota

Have you checked that the path to the image is correct and that the image gets loaded?

BTW. Using Qt methods for binding the texture might be a bit less error prone, i.e.

Code:

---

bindTexture(QPixmap(":/images/side.png"), GL_TEXTURE_2D);

---

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Yes. The path to the image is correct and that the image gets loaded.
Same code works fine with QGLWidget in QGLWidget::paintGL().

Maybe this helps:
http://labs.trolltech.com/blogs/2008...s-with-opengl/

Quote:

---

Originally Posted by wysota

Maybe this helps:
http://labs.trolltech.com/blogs/2008...s-with-opengl/

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Unfortunately, i use QT-4.3.1. In addition, i want solve problem with method presented above.

The version doesn't matter. I gave you the link because there is OpenGL used to implement drawBackground() for a graphics scene. Maybe you need to do something special for GL to work there and maybe you'll find it in the source code of the article.