From 932107dee70110275861d436498d86a5301afc97 Mon Sep 17 00:00:00 2001
From: Juraj Michalek <juraj.michalek@gmail.com>
Date: Mon, 6 May 2019 09:40:58 +0200
Subject: [PATCH] update Allegro example

---
 allegro/example-01.c | 79 +++++++++++++++++++++++---------------------
 1 file changed, 42 insertions(+), 37 deletions(-)

diff --git a/allegro/example-01.c b/allegro/example-01.c
index 259b5b3..c705e67 100644
--- a/allegro/example-01.c
+++ b/allegro/example-01.c
@@ -12,50 +12,55 @@
 
 int main()
 {
-	ALLEGRO_EVENT_QUEUE *event_queue;
-	ALLEGRO_DISPLAY *display;
-	
-	ALLEGRO_EVENT event;
-	ALLEGRO_BITMAP *image;
+    ALLEGRO_EVENT_QUEUE *event_queue;
+    ALLEGRO_DISPLAY *display;
+    
+    ALLEGRO_EVENT event;
+    ALLEGRO_BITMAP *image;
 
-	al_init();
-	al_install_keyboard();
-	al_init_image_addon();
-	
-	display = al_create_display(640, 480);
-	if (!display)
-	{
-		return 2;
-	}
+    if(!al_init()) {
+        fprintf(stderr, "failed to initialize allegro!\n");
+        return -1;
+    }
 
-	// Create Event queue
+    display = al_create_display(640, 480);
+    if (!display)
+    {
+        fprintf(stderr, "failed to create display!\n");
+        return 2;
+    }
+
+    al_install_keyboard();
+    al_init_image_addon();
+    
+    // Create Event queue
         event_queue = al_create_event_queue();
 
-	// Register Keyboard to queue
+    // Register Keyboard to queue
     al_register_event_source(event_queue, al_get_keyboard_event_source());
-	al_register_event_source(event_queue, al_get_display_event_source(display));
+    al_register_event_source(event_queue, al_get_display_event_source(display));
 
-	// Clear screen
-	al_clear_to_color(al_map_rgb_f(1.0, 1.0, 1.0));
-	
-	// Load and display image
-	image = al_load_bitmap("smajlik.png");
-	if (image != NULL)
-	{
-		al_draw_bitmap(image, 10, 10, 0);
-	} else {
-		printf("No bitmap.\n");
-		return 1;
-	}
-	al_flip_display();
+    // Clear screen
+    al_clear_to_color(al_map_rgb_f(1.0, 1.0, 1.0));
+    
+    // Load and display image
+    image = al_load_bitmap("smajlik.png");
+    if (image != NULL)
+    {
+        al_draw_bitmap(image, 10, 10, 0);
+    } else {
+        printf("No bitmap.\n");
+        return 1;
+    }
+    al_flip_display();
 
-	// Wait until some key is pressed
-	al_wait_for_event(event_queue, &event);
+    // Wait until some key is pressed
+    al_wait_for_event(event_queue, &event);
 
-	// Release
-	al_destroy_bitmap(image);
-	al_uninstall_keyboard();
-	al_uninstall_system();
-	return 0;
+    // Release
+    al_destroy_bitmap(image);
+    al_uninstall_keyboard();
+    al_uninstall_system();
+    return 0;
 }