I’m trying to make a small game using (free)GLUT. I know that it’s old and there are better alternatives, but currently I prefer to stick with it and use it as much as possible. I program with C.
I’m currently trying to make GLUT detect properly all the keys I press.
I use glutKeyboardFunc, glutKeyboardUpFunc, glutSpecialFunc and glutSpecialUpFunc to detect pressed keys and I store their state in a short array I created (I currently have only 5 usable keys, so I just created a specific array for them).
However, while everything works fine for 2 keys or less, the game doesn’t detect properly 3 keys or more. While for some keys it detect the combination properly (that actually happens for only 1 specific combination), for others the functions simply don’t detect the third key that I press.
I checked my code a few times, and there is nothing special about the combination that does work.
I also made glutKeyboardFunc and glutSpecialFunc directly print every key-press that they receive, and it seems they simply stop working after I press more then 2 keys.
Is it a known issue with GLUT or something? I googled a lot and didn’t find anyone with a similar issue.
I am not very into GLUT but as I know, but you should make sure, that your keyboard supports more than 2 input keys at once. This feature is called n-key rollover. This page says, that 2-key rollover may be a common value for some keyboards, but you dont need to trust this source.