Created an event manager.

CMakeLists.txt

@@ -42,8 +42,9 @@ include_directories(
 	SYSTEM ${ALLEG5_INCLUDE_DIRS})
 
 set(SRCS
-	src/main.c
-	src/display.c)
+	src/display.c
+	src/event_manager.c
+	src/main.c)
 
 add_definitions(-DVERSION="${TARGET_VERSION}")
 

src/display.c

@@ -18,18 +18,26 @@
 
 #include "display.h"
 
-#include <stdio.h>
+#ifdef DEBUG
+#	include <stdio.h>
+#endif
 #include <allegro5/allegro.h>
 
-static ALLEGRO_DISPLAY *display;
+ALLEGRO_DISPLAY *display;
 
 int create_display(unsigned int width, unsigned int height) {
 	display = al_create_display(width, height);
 	if(!display)
 		return 0;
+#ifdef DEBUG
+	puts("Initialized display.");
+#endif
 	return 1;
 }
 
 void destroy_display() {
 	al_destroy_display(display);
+#ifdef DEBUG
+	puts("Destroyed display.");
+#endif
 }

src/event_manager.c

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2018  Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
+ * Author: Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "event_manager.h"
+#include "globals.h"
+
+#ifdef DEBUG
+#	include <stdio.h>
+#endif
+#include <allegro5/allegro.h>
+
+static ALLEGRO_EVENT_QUEUE *event_queue;
+static ALLEGRO_TIMER *timer;
+
+int evnt_mngr_init() {
+	timer = al_create_timer(1.0f / FPS);
+	if(!timer)
+		return 0;
+#ifdef DEBUG
+	puts("Initialized timer.");
+#endif
+
+	event_queue = al_create_event_queue();
+	if(!event_queue)
+		return 0;
+#ifdef DEBUG
+	puts("Initialized event queue.");
+#endif
+	al_register_event_source(event_queue,
+			al_get_display_event_source(display));
+	al_register_event_source(event_queue,
+			al_get_timer_event_source(timer));
+	al_start_timer(timer);
+	return 1;
+}
+
+void evnt_mngr_deinit() {
+	al_destroy_timer(timer);
+#ifdef DEBUG
+	puts("Destroyed timer.");
+#endif
+	al_destroy_event_queue(event_queue);
+#ifdef DEBUG
+	puts("Destroyed event queue.");
+#endif
+}
+
+void handle_event() {
+	ALLEGRO_EVENT evnt;
+	al_wait_for_event(event_queue, &evnt);
+
+	if(evnt.type == ALLEGRO_EVENT_TIMER)
+		redraw = 1;
+	else if(evnt.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
+		run = 0;
+}

src/event_manager.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2018  Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
+ * Author: Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+/**
+ * @brief Initialize the event handler.
+ *
+ * @return 0 upon failure, 1 upon success.
+ */
+int evnt_mngr_init();
+
+/**
+ * @brief Deinitialize the event handler.
+ */
+void evnt_mngr_deinit();
+
+/**
+ * @brief Handle the next event in the queue (wait if the
+ * queue is empty).
+ */
+void handle_event();

src/globals.h

@@ -23,7 +23,12 @@
 #endif
 
 #ifndef FPS
-#	define FPS 60
+#	define FPS 60.0f
 #endif
 
+#include <allegro5/allegro.h>
+
+extern ALLEGRO_DISPLAY *display; ///< The allegro display.
+
+extern int redraw; ///< Whether or not to redraw the screen.
 extern int run; ///< Whether or not to continue running the simulation.

src/main.c

@@ -18,8 +18,10 @@
 
 #include "globals.h"
 #include "display.h"
+#include "event_manager.h"
 
 int run;
+int redraw;
 
 #include <stdio.h>
 #include<allegro5/allegro.h>
@@ -38,18 +40,32 @@ int main() {
 		return 1;
 	}
 
+	if(!evnt_mngr_init())
+	{
+		fprintf(stderr, "alleg5: failed to initialize event queue.\n");
+		destroy_display();
+		return 1;
+	}
+
 	// begin running the simulation
 	run = 1;
-
+	redraw = 1;
 	while(run)
 	{
-		// TODO: handle events
+		handle_event();
 		// TODO: run simulation physics
+
+		// only redraw if the timer event has occurred
+		if(redraw)
+		{
 			al_clear_to_color(al_map_rgb(0, 0, 0));
 			// TODO: run simulation draw functions
 			al_flip_display();
+			redraw = 0;
+		}
 	}
 
+	evnt_mngr_deinit();
 	destroy_display();
 
 	return 0;