A working example of a simple use of the Allegro C library (liballeg.org) in Go

go-allegro.go

package main

/*
#cgo LDFLAGS: -lallegro
#include <stdio.h>
#include <stdlib.h>
#include <allegro5/allegro.h>

inline ALLEGRO_EVENT_TYPE extract_event(const ALLEGRO_EVENT* p_evt)
{
  return p_evt->type;
}

inline const ALLEGRO_KEYBOARD_EVENT* extract_keyboard_event(const ALLEGRO_EVENT* p_evt)
{
  return &(p_evt->keyboard);
}

*/
import "C"
import "fmt"

func main() {
	C.al_install_system(C.ALLEGRO_VERSION_INT, nil)
	C.al_install_keyboard()
	defer C.al_uninstall_system()

	fmt.Println("Start")

	p_display := C.al_create_display(640, 480)
	p_evqueue := C.al_create_event_queue()

	defer C.al_destroy_display(p_display)
	defer C.al_destroy_event_queue(p_evqueue)

	C.al_register_event_source(p_evqueue, C.al_get_display_event_source(p_display))
	C.al_register_event_source(p_evqueue, C.al_get_keyboard_event_source())

	run := true
	for run {
		// Handle events
		var evt C.ALLEGRO_EVENT
		for C.al_get_next_event(p_evqueue, &evt) {
			switch (C.extract_event(&evt)) {
			case C.ALLEGRO_EVENT_DISPLAY_CLOSE:
				run = false
			case C.ALLEGRO_EVENT_KEY_DOWN:
				if C.extract_keyboard_event(&evt).keycode == C.ALLEGRO_KEY_ESCAPE {
					run = false
				}
			}
		}

		C.al_clear_to_color(C.al_map_rgb(0, 0, 0))
		C.al_flip_display()
	}

	fmt.Println("Finish")
}