Allegro game programming library: how to install on Ubuntu, OS X and Windows
Posted: December 7th, 2008 | Author: Remi | Filed under: Programming | 7 Comments »When it comes to simple 2D game programming Allegro is great. It may be a little tricky to get allegro to install on some systems, but I will cover how to do it on three: Ubuntu, OS X and Windows.
We’ll be starting with the easiest, Ubuntu
Open up the terminal (Applications > Accessories > Terminal) and type if you have not already
sudo apt-get install build-essential
Then we’ll install Allegro:
sudo apt-get install liballegro4.2-dev
Thats it, allegro is installed and gcc is ready to compile allegro source.
To compile and run file by name inputfile.c in gcc type:
gcc inputfile.c -o output `allegro-config --libs`
./output
On OS X it is a little tricker, and I highly recommend installing X-Code to compile the code with, there is a way to install gcc without X-Code, but I don’t recommend it, and I won’t cover it here.
download X-Code here (You have to become an ADC member to download, it’s free). You can also install X-Code (developer tools) from your OS X installation disk.
download the allegro source for Unix on their website here
its a tar.gz so, double click it and it should be expanded into a folder.
Now open the terminal (/Applications/Utilities/Terminal) and type “cd ” then drag the allegro folder to the window and hit enter, now type the following:
chmod +x fix.sh
./fix.sh macosx
make
sudo make install
sudo make install-man
sudo make install-framework
sudo make install-framework EMBED=1
sudo make install-template
If you are using X-Code 3.0 or higher then type the following to make the template work:
mv /Library/Application\ Support/Apple/Developer\ Tools/Project\ Templates/Application/Allegro\ Application /Developer/Library/Xcode/Project\ Templates/Application
There, you’re done, now all you need to do is open X-Code and then click File > New Project then under application choose allegro application.
For windows, you can install Allegro to work with Visual C++ or other Microsoft IDE’s if you use them for development, but if you don’t have any of those don’t fret, just download and install Bloodshed’s Dev-Cpp here
Then to install allegro, download the allegro devpak here and then just double click it.
Once it installs you should be set, now just open Dev-Cpp and make a new allegro project.
Here is some code you can try and compile, it’s a version of pong I wrote for allegro, it’s still buggy so beware!
/* * Pong * * Created by Remi Bernotavicius on 12/4/08. * Copyright (c) 2008 __MyCompanyName__. All rights reserved. */ #include <allegro.h> #include <math.h> #define paddle_width 10 #define paddle_height 50 #define screen_width 640 #define screen_height 400 #define ball_speed 70 #define ball_size 6 #define paddle_speed 15 #define dashed_frequency 20.00 #define UP 0 #define CENTER 1 #define DOWN 2 //left side int yl = ((screen_height / 2) - (paddle_height/2))*paddle_speed; int points_l = 0; int direction_l = CENTER; //right side int yr = ((screen_height / 2) - (paddle_height/2))*paddle_speed; int points_r = 0; int direction_r = CENTER; //ball int bx = (screen_width / 2)*ball_speed; int by = (screen_height / 2)*ball_speed; int angle = 30; int i_speed = 5; int rest_counter = 0; void gatherInput() { if(key[KEY_DOWN] && yr < (screen_height - paddle_height)*paddle_speed) { yr++; direction_r = DOWN; } else if(key[KEY_UP] && yr > 0) { yr--; direction_r = UP; } else { direction_r = CENTER; } if(key[KEY_Z] && yl < (screen_height - paddle_height)*paddle_speed) { yl++; direction_l = DOWN; } else if(key[KEY_A] && yl > 0) { yl--; direction_l = UP; } else { direction_l = CENTER; } } int main(int argc, const char *argv[]) { allegro_init(); install_keyboard(); if (set_gfx_mode(GFX_AUTODETECT, screen_width, screen_height, 0, 0)) { allegro_message("Error setting 320x200x8 gfx mode:\n%s\n", allegro_error); return -1; } //Title Screen textprintf_centre_ex(screen, font, screen_width/2, 100, makecol(255, 255, 255), -1, "Pong!"); textprintf_centre_ex(screen, font, screen_width/2, 120, makecol(255, 255, 255), -1, "By Remi Bernotavicius"); textprintf_centre_ex(screen, font, screen_width/2, 140, makecol(255, 255, 255), -1, "Press Space Bar to Start"); while(!key[KEY_SPACE]) { if(key[KEY_ESC]) return 0; } BITMAP* buffer = create_bitmap(screen_width, screen_height); while(!key[KEY_ESC]) { gatherInput(); clear_to_color(buffer, 0); //score textprintf_centre_ex(buffer, font, screen_width/4, 10, makecol(255, 255, 255), -1, "%d", points_l); textprintf_centre_ex(buffer, font, screen_width*(3.00/4.00), 10, makecol(255, 255, 255), -1, "%d", points_r); //dashed line float f; for(f = 1.00;f < dashed_frequency;f +=2.00) line(buffer, screen_width/2, -10 + screen_height - (screen_height*(f/dashed_frequency)) + (screen_height*(1.00/dashed_frequency)), screen_width/2, -10 + screen_height - (screen_height*(f/dashed_frequency)), makecol(255, 255, 255)); //left paddle rectfill(buffer, 10, yl/paddle_speed, 10+paddle_width, (yl/paddle_speed)+paddle_height, makecol(255, 255, 255)); //right paddle rectfill(buffer, screen_width - 10 - paddle_width, yr/paddle_speed, screen_width - 10, (yr/paddle_speed)+paddle_height, makecol(255, 255, 255)); while(angle > 360) angle -= 360; while(angle < -360) angle += 360; if(rest_counter == 0) { bx+=cos(angle*M_PI/180)*i_speed; by+=sin(angle*M_PI/180)*i_speed; } else { rest_counter--; } circlefill(buffer, bx/ball_speed, by/ball_speed, ball_size, makecol(250, 250, 250)); //collision detection if((by/ball_speed) > screen_height - ball_size) { angle *= -1; by = (screen_height - ball_size)*ball_speed; } else if((by/ball_speed) < ball_size) { angle *= -1; by = ball_size * ball_speed; } if((bx/ball_speed) > (screen_width - 10 - paddle_width - ball_size)) { if((by / ball_speed) > ((yr/paddle_speed) - ball_size) && (by / ball_speed) < (((yr/paddle_speed) + paddle_height) + ball_size)) { //If the ball hit the right paddle angle *= -1; angle += 180; if(direction_r == UP) { angle += 30*sin(angle*M_PI/180); i_speed -= 2*sin(angle*M_PI/180); } else if(direction_r == DOWN) { angle -= 30*sin(angle*M_PI/180); i_speed += 2*sin(angle*M_PI/180); } bx = (screen_width - 10 - paddle_width - ball_size)*ball_speed; } else { //If the ball went off the screen on the right points_l++; bx = (screen_width/2)*ball_speed; by = (screen_height/2)*ball_speed; angle = 30; i_speed = 5; rest_counter = 3000; } } else if((bx/ball_speed) < 10 + paddle_width + ball_size) { if((by / ball_speed) > ((yl/paddle_speed) - ball_size) && (by / ball_speed) < (((yl/paddle_speed) + paddle_height) + ball_size)) { //If the ball hit the left paddle angle *= -1; angle += 180; if(direction_l == UP) { angle -= 30*sin(angle*M_PI/180); i_speed -= 2*sin(angle*M_PI/180); } else if(direction_l == DOWN) { angle += 30*sin(angle*M_PI/180); i_speed += 2*sin(angle*M_PI/180); } bx = (10 + paddle_width + ball_size)*ball_speed; } else { //If the ball went off the screen on the left points_r++; bx = (screen_width/2)*ball_speed; by = (screen_height/2)*ball_speed; angle = 150; i_speed = 5; rest_counter = 3000; } } blit(buffer, screen, 0, 0, 0, 0, screen_width, screen_height); } return 0; } END_OF_MAIN(); |
