1 reply to this topic

[roxtar]

Why is it that glGetString only works after we initialize the window? I mean if I write something like:

#include <GL/gl.h>

#include <stdio.h>

int main(int argc,char **argv) {

  if(glGetString(GL_VENDOR)) {

    printf("%s\n",glGetString(GL_VENDOR));

  }

  else {

    printf("Error. %d",glGetError());

  }

}

it won't work.

[Kenneth Gorking]

Because OpenGL hasn't been initialized yet, and it's dependant on the pixelformat you associate with the device context in windows, or the visual you choose under linux. It is possible to create an unaccelerated instance of OpenGL under windows, and it would return different caps than the accelerated version.