Hi guys is possible discern if i click mouse left or mouse right or middle mouse in Allegro ?? thanks

https://liballeg.org/a5docs/trunk/events.html#allegro_event_mouse_button_down

Buttons number from 1 to #. I think 2 is RMB and 3 is MMB.

Did you RTFM?

Just kidding.

Question: Allegro 4 or 5?

Assuming 5.

Check your events. If a button was pressed, you'll get this event triggered.

ALLEGRO_EVENT_MOUSE_BUTTON_DOWN

This is from the docs

mouse.button (unsigned)
The mouse button which was pressed, numbering from 1.

if (event.mouse.button == 1) std::cout << "Left button pressed!" << std::endl;