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Very Simple Code Stopped Working :-(

Started by leiavoia Jul 13, 2004 at 11:17 PM 5 replies 900+ views

Original Post

Jul 13, 2004 at 11:17 PM

I just switched me dev system over from Mandrake 9.1 Linux to Debain/GNU Linux. I got my program to compile but nothing shows up on the screen. It would seem that OpenGL is not giving me textures or reserving memory like i want. It used to compile, but sinced i switched systems, it just displays black. Please look at this very simple bit of code:


GLuint texture = 555; // dummy number - should get overwritten

glGenTextures( 1, &texture );
std::cout << "Generated texture index: " << (int)texture << std::endl;

glGenTextures( 1, &texture );
std::cout << "Generated texture index: " << (int)texture << std::endl;

glGenTextures( 1, &texture );
std::cout << "Generated texture index: " << (int)texture << std::endl;

glGenTextures( 1, &texture );
std::cout << "Generated texture index: " << (int)texture << std::endl;

This should print: 1 2 3 4 but instead prints: 555 555 555 555 Can you think of anything that would cause this behaviour? I'm stumped.

Myopic Rhino

Jul 13, 2004 at 11:19 PM

This seems like something that would happen if you don't have a valid context. Other than that, try calling glGetError().

leiavoia

Jul 13, 2004 at 11:35 PM

What specifically do you mean by valid context? glGetError only returns zero. The weird thing is that, like i said, i haven't actually changed the code any.

leiavoia

Jul 14, 2004 at 12:02 AM

UPDATE:

Just to make it even weirder, i have some old NeHe tutorials that were compiled on my old system. They work fine right off the binaries. But if i try to delete them and recompile, they just throw a blank screen. Weird!