OpenGL texture randomly not shown

Question

I have got a very, very strange problem in my C++ OpenGL application.

I simply load a texture and apply it to a quadric:

glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, 3, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

Then

glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, tex);
gluQuadricDrawStyle(quad,GLU_FILL);
gluQuadricTexture(quad,GL_TRUE);
gluCylinder(quad,1,0,2,20,1);
glDisable(GL_TEXTURE_2D);

Now: it works perfectly 9 times out of ten, but sometimes the texture isn't shown (the quadric stays white).

The image is correctly loaded, so the problem should be with OpenGL. I have tried with several different images too. Always GL_NO_ERROR.

Any idea ? It is driving me crazy...

Kinda silly but on the times where it doesn't load, if you minimize then maximize the window, does it appear? — Robb
Can you test it on a different PC or with different drivers? — Maurice Gilden
By "texture isn't shown" do you mean when you restart the application? — Xavier Ho

TheDude TheDude · Accepted Answer · 2010-04-28T13:57:01

Found :) It was the GLint texture member that wasn't correctly reallocated in the copy constructor.

However, i still don't understand why it worked sometimes...

OpenGL texture randomly not shown

2 Answers