Hello World example for Allegro.
CC := gcc
CFLAGS := -g -Wall
LIBS := -lallegro
SOURCES := $(shell find src/ -type f -name "*.c")
OBJECTS := $(SOURCES:.c=.o)
TARGET := game
all: $(SOURCES) $(TARGET)
$(TARGET): $(OBJECTS)
@echo " Linking..."; $(CC) $^ -o $@ $(LIBS)
%.o: %.c
@echo " CC $<"; $(CC) $(CFLAGS) -c -o $@ $<
clean:
@echo " Cleaning..."; $(RM) src/*.o $(TARGET)
.PHONY: all clean
/*
* This program uses the Allegro game library to display a blank window.
*
* It initializes the display and starts up the main game loop. The
* game loop only checks for two events: timer (determined by the FPS)
* and display close (when the user tries to close the window).
*
* http://www.damienradtke.org/building-a-mario-clone-with-allegro
*/
#include <stdio.h>
#include <allegro5/allegro.h>
const float FPS = 60;
int main(int argc, char *argv[])
{
ALLEGRO_DISPLAY *display = NULL;
ALLEGRO_EVENT_QUEUE *event_queue = NULL;
ALLEGRO_TIMER *timer = NULL;
bool running = true;
bool redraw = true;
// Initialize allegro
if (!al_init()) {
fprintf(stderr, "Failed to initialize allegro.\n");
return 1;
}
// Initialize the timer
timer = al_create_timer(1.0 / FPS);
if (!timer) {
fprintf(stderr, "Failed to create timer.\n");
return 1;
}
// Create the display
display = al_create_display(640, 480);
if (!display) {
fprintf(stderr, "Failed to create display.\n");
return 1;
}
// Create the event queue
event_queue = al_create_event_queue();
if (!event_queue) {
fprintf(stderr, "Failed to create event queue.");
return 1;
}
// Register event sources
al_register_event_source(event_queue, al_get_display_event_source(display));
al_register_event_source(event_queue, al_get_timer_event_source(timer));
// Display a black screen
al_clear_to_color(al_map_rgb(0, 0, 0));
al_flip_display();
// Start the timer
al_start_timer(timer);
// Game loop
while (running) {
ALLEGRO_EVENT event;
ALLEGRO_TIMEOUT timeout;
// Initialize timeout
al_init_timeout(&timeout, 0.06);
// Fetch the event (if one exists)
bool get_event = al_wait_for_event_until(event_queue, &event, &timeout);
// Handle the event
if (get_event) {
switch (event.type) {
case ALLEGRO_EVENT_TIMER:
redraw = true;
break;
case ALLEGRO_EVENT_DISPLAY_CLOSE:
running = false;
break;
default:
fprintf(stderr, "Unsupported event received: %d\n", event.type);
break;
}
}
// Check if we need to redraw
if (redraw && al_is_event_queue_empty(event_queue)) {
// Redraw
al_clear_to_color(al_map_rgb(0, 0, 0));
al_flip_display();
redraw = false;
}
}
// Clean up
al_destroy_display(display);
al_destroy_event_queue(event_queue);
return 0;
}