I've been trying my luck with a bit of simple game development. One thing that has got me stumpted is whether to use callbacks for input, or poll the input and store the values in a table which various functions check.
Basically, my table is an array of:
Then using, pretty much a hash table to lookup the key in the array. Basically, when the user pushes a key should I send the key to either say, the game or a text-edit field based on the state. Or have the game and text-edit 'modules' check for input themselves?
int status; /* if the key is down */
double lastQuery; /* last time checked for hit */
I'm asking because I haven't really seen the method above in other projects (they all seem to use callbacks) -- and I was wondering if it was a wise idea. ie, "tell me when there's input" OR "I'll find out for myself when there's input"?
FYI, I store the last time it was checked so I can control various things like 'sticky keys'.
Is how I currently do it, and another simple function where time is not important (ie just returns true if the key is down)
/* returns true if a key has been pressed */
int input_keyboard_was_pressed(int key)
float diff = 0.0f;
double now = 0.0;
if(key < INPUT_KEYBOARD_TABLE_SIZE)
if(keytable[key].status == GL_FALSE)
now = timer_seconds_since_start();
diff = (float)(now - keytable[key].lastQuery); /* *should* be small
TODO: Possible bug if the keys aren't used for hours */
if(diff >= input.stickyTime)
keytable[key].lastQuery = now;