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/**
* Project - Allegro Pong
* Author - packetpirate
* Last Update - 04/21/2011 1:11 AM
**/
#include <stdio.h>
#include <allegro5/allegro.h>
const int FPS = 60;
const int SCREEN_W = 1024;
const int SCREEN_H = 480;
const int PONG_PADDLE_W = 20;
const int PONG_PADDLE_H = 100;
const float PADDLE_ONE_X = 20 + (PONG_PADDLE_W / 2.0);
const float PADDLE_TWO_X = SCREEN_W - 35 - PONG_PADDLE_W;
const int BALL_SIZE = 16;
enum myKeys {
KEY_UP, KEY_DOWN, KEY_LEFT, KEY_RIGHT
};
int main(int argc, char** argv)
{
ALLEGRO_DISPLAY *display = NULL;
ALLEGRO_TIMER *timer = NULL;
ALLEGRO_EVENT_QUEUE *event_queue = NULL;
ALLEGRO_BITMAP *paddle_one = NULL;
float paddle_one_y = SCREEN_H / 2.0 - PONG_PADDLE_H / 2.0;
ALLEGRO_BITMAP *paddle_two = NULL;
float paddle_two_y = SCREEN_H / 2.0 - PONG_PADDLE_H / 2.0;
ALLEGRO_BITMAP *ball = NULL;
float ball_x = SCREEN_W / 2.0 - BALL_SIZE / 2.0;
float ball_y = SCREEN_H / 2.0 - BALL_SIZE / 2.0;
float ball_dx = -4.0, ball_dy = 4.0;
bool key[4] = {false, false, false, false};
bool redraw = true;
bool exit = false;
// Initialize Allegro
if(!al_init()) {
fprintf(stderr, "Error initializing Allegro!\n");
return -1;
}
// Install the keyboard.
if(!al_install_keyboard()) {
fprintf(stderr, "Error installing keyboard!\n");
return -1;
}
// Create 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(SCREEN_W, SCREEN_H);
if(!display) {
fprintf(stderr, "Could not create display!\n");
return -1;
}
// Create Pong Paddle One
paddle_one = al_create_bitmap(PONG_PADDLE_W, PONG_PADDLE_H);
if(!paddle_one) {
fprintf(stderr, "Failed to create Pong Paddle One!\n");
al_destroy_display(display);
al_destroy_timer(timer);
return -1;
}
// Set color of Pong Paddle One
al_set_target_bitmap(paddle_one);
al_clear_to_color(al_map_rgb(255,255,255));
al_set_target_bitmap(al_get_backbuffer(display));
// Create Pong Paddle Two
paddle_two = al_create_bitmap(PONG_PADDLE_W, PONG_PADDLE_H);
if(!paddle_two) {
fprintf(stderr, "Failed to create Pong Paddle Two!\n");
al_destroy_display(display);
al_destroy_timer(timer);
return -1;
}
// Set the color of Pong Paddle Two
al_set_target_bitmap(paddle_two);
al_clear_to_color(al_map_rgb(255,255,255));
al_set_target_bitmap(al_get_backbuffer(display));
// Create the Ball
ball = al_create_bitmap(BALL_SIZE, BALL_SIZE);
if(!ball) {
fprintf(stderr, "Failed to create ball!\n");
al_destroy_display(display);
al_destroy_timer(timer);
return -1;
}
// Set the color of the ball.
al_set_target_bitmap(ball);
al_clear_to_color(al_map_rgb(255,0,0));
al_set_target_bitmap(al_get_backbuffer(display));
event_queue = al_create_event_queue();
if(!event_queue) {
fprintf(stderr, "Error creating event queue!\n");
al_destroy_bitmap(paddle_one);
al_destroy_bitmap(paddle_two);
al_destroy_bitmap(ball);
al_destroy_display(display);
al_destroy_timer(timer);
return -1;
}
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_register_event_source(event_queue, al_get_keyboard_event_source());
al_clear_to_color(al_map_rgb(0,0,0));
al_flip_display();
al_start_timer(timer);
while(!exit) {
ALLEGRO_EVENT ev;
al_wait_for_event(event_queue, &ev);
if(ev.type == ALLEGRO_EVENT_TIMER) {
if(key[KEY_UP] && paddle_one_y >= 4.0) {
paddle_one_y -= 4.0;
}
if(key[KEY_DOWN] && paddle_one_y <= SCREEN_H - PONG_PADDLE_H - 4.0) {
paddle_one_y += 4.0;
}
if(ball_y < 0 || ball_y > SCREEN_H - BALL_SIZE) {
ball_dy = -ball_dy;
}
ball_x += ball_dx;
ball_y += ball_dy;
redraw = true;
}
else if(ev.type == ALLEGRO_KEY_ESCAPE) {
break;
}
else if(ev.type == ALLEGRO_EVENT_KEY_DOWN) {
switch(ev.keyboard.keycode) {
case ALLEGRO_KEY_UP:
key[KEY_UP] = true;
break;
case ALLEGRO_KEY_DOWN:
key[KEY_DOWN] = true;
break;
}
}
else if(ev.type == ALLEGRO_EVENT_KEY_UP) {
switch(ev.keyboard.keycode) {
case ALLEGRO_KEY_UP:
key[KEY_UP] = false;
break;
case ALLEGRO_KEY_DOWN:
key[KEY_DOWN] = false;
break;
case ALLEGRO_KEY_ESCAPE:
exit = true;
break;
}
}
if(redraw && al_is_event_queue_empty(event_queue)) {
redraw = false;
al_clear_to_color(al_map_rgb(0,0,0));
al_draw_bitmap(paddle_one, PADDLE_ONE_X, paddle_one_y, 0);
al_draw_bitmap(paddle_two, PADDLE_TWO_X, paddle_two_y, 0);
al_draw_bitmap(ball, ball_x, ball_y, 0);
al_flip_display();
}
}
al_destroy_bitmap(paddle_one);
al_destroy_bitmap(paddle_two);
al_destroy_bitmap(ball);
al_destroy_timer(timer);
al_destroy_display(display);
al_destroy_event_queue(event_queue);
return 0;
}
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