al_mouse_button_down
bool al_mouse_button_down(const ALLEGRO_MOUSE_STATE *state, int button)
Return true if the mouse button specified was held down in the state specified. Unlike most things, the first mouse button is numbered 1.
See also: ALLEGRO_MOUSE_STATE, al_get_mouse_state, al_get_mouse_state_axis
Examples: ex_mouse
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