glGetString(GL_EXTENSIONS) returns 0 ???

[samueleagle]

The glGetString(GL_EXTENSIONS) always return 0 to me. The same problem with GL_VERSION,etc. The plafform is Windows XP. Acturally I've writen a simple glut program and successed. The glew can be used in my competer, the supported extensions are return by it. But why glGetString function always return 0? :confused:

Thanks for your time.

Samuel

[samueleagle]

Nobody answers? OK, I myself try to answer.

I tried to move my glGetString function after glutCreateWindow(), the result is OK. It seems the glGetString must be invoked aftger some OpenGL function in the "glutCreateWindow".

Thanks.

Samuel

[mikael_aronsson]

All OpenGL functions require that you have a valid rendering context, without that it does not work.

Without a rendering context it cannot tell what version you are using because it might be software rendering or HW accel. rendering depending on the context.

Mikael