You have to use 1024 and not 1000 and temp is also not needed.

Better version:

Code:

function get_videomemory()
{
  return(d3d_texfree/1024);
}

...

void main()
{
   ...
   if(get_videomemory > 512)
   {
      printf("more than 512 Mb video memory free");
   }
   ...
}


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