some simple questions

OpenGL OpenGL: Basic Coding
1

  1. If I change from window to fullscreen, what must be done? Do I need a new rendering context, do I have to deactivate the current or what?

  2. How do I turn on textures? I have loaded some textures, I draw polygons with texture coordinates, I have called glGenTextures,glBindTexture,glTexImage2d (in this order), but nothing happens, the polygons are colored, but without textures.

2

1: Not sure if you HAVE to create a new context, but it’s good to do it. If you change color resolution and/or depth bits, some problems might occur, not sure though. Better to be on the safe side.

2: You need to glEnable(GL_TEXTURE_2D); before texture mapping is used.

3

Thanks a lot, now everything works.

4

“If I change from window to fullscreen, what must be done? Do I need a new rendering context, do I have to deactivate the current or what?”

Like bob said you’d better create a new one.
I also wanted to say that you should reload all textures when going fullsreen/back2window.