Okay, so now I have a better understanding of how to use such complex libraries and while it may be kewl in theory, it's very lame in practice. I found this example code online but I can't get it to work (from cppgameprogramming.com • View topic - hello world allegro 5)
main.c :
Code:
#include <allegro5/allegro5.h>
//#include <allegro5/allegro_image.h>
//#include <allegro5/allegro_primitives.h>
//#include <allegro5/allegro_color.h>
#include <allegro5/allegro_font.h>
#include <allegro5/allegro_ttf.h>
//#include <allegro5/allegro_audio.h>
//#include <allegro5/allegro_acodec.h>
//#include <allegro5/allegro_memfile.h>
//#include <allegro5/allegro_physfs.h>
//#include <allegro5/allegro_native_dialog.h>
#include <cstdio>
void init(ALLEGRO_EVENT_QUEUE* &e_queue, int w, int h, int full=0, int opengl=1)
{
if(full) al_set_new_display_flags(ALLEGRO_FULLSCREEN);
if(opengl) al_set_new_display_flags(ALLEGRO_OPENGL);
ALLEGRO_DISPLAY* display = al_create_display(w,h); //it doesn't need to be global because you can always access it by al_get_current_display();
if(!display) printf("ERROR INITIALIZING THE DISPLAY AT %i %i!",w,h);
e_queue = al_create_event_queue();
if(!e_queue) printf("ERROR CREATING EVENT QUEUE!");
al_register_event_source(e_queue, al_get_display_event_source(display));
//al_register_event_source(e_queue, al_get_mouse_event_source());
al_register_event_source(e_queue, al_get_keyboard_event_source());
//al_register_event_source(e_queue, al_get_joystick_event_sourc());
}
int install_allegro()
{
if(!al_init())
{
printf("ERROR INITIALIZING ALLEGRO!");
return 0;
}
if(!al_install_keyboard())
{
printf("ERROR INITIALIZING KEYBOARD!");
return 0;
}
/*if(!al_install_mouse())
{
printf("ERROR INITIALIZING MOUSE!");
return 0;
}
if(!al_install_joystick())
{
printf("ERROR INITIALIZING JOYSTICK!");
return 0;
}
*/
/*
if(!al_init_image_addon())
{
printf("ERROR INITIALIZING IMAGE ENGINE!");
return 0;
}
if(!al_init_primitives_addon())
{
printf("ERROR INITIALIZING PRIMITIVES ADDON!");
}
*/
al_init_font_addon();
if(!al_init_ttf_addon())
{
printf("ERROR INITIALIZING FONT ENGINE!\n");
return 0;
}
/*
if(!al_init_audio_addon())
{
printf("ERROR INITIALIZING AUDIO ADDON!");
return 0;
}
if(!al_init_acodec_addon())
{
printf("ERROR INITIALIZING AUDIO CODECS!");
return 0;
}*/
//al_set_physfs_file_interface();
return 1;
}
int main()
{
ALLEGRO_EVENT_QUEUE* event_queue = NULL;
if(!install_allegro()) return 1;
init(event_queue,800,600);
ALLEGRO_FONT* font_times = al_load_font("times.ttf",20,0);
if(font_times==NULL)
{
printf("ERROR LOADING FONT!\n");
return 1;
}
al_clear_to_color(al_map_rgb(0,0,0));
al_draw_text(font_times,al_map_rgb(255,255,0),400,300,ALLEGRO_ALIGN_CENTRE,"Hello World");
al_flip_display();
ALLEGRO_EVENT ev;
bool quit = false;
while(!quit)
{
al_wait_for_event(event_queue,&ev);
if(ev.type==ALLEGRO_EVENT_KEY_DOWN)
{
if(ev.keyboard.keycode==ALLEGRO_KEY_ESCAPE) quit = true;
}
}
al_destroy_display(al_get_current_display());
al_destroy_event_queue(event_queue);
return 0;
}
Makefile :
Code:
MKFILE = Makefile
GCC = g++ -g -O3 -Wall -Wextra `pkg-config --cflags --libs allegro-5.0 allegro_font-5.0 allegro_ttf-5.0 allegro_font-5 allegro_ttf-5` -std=c++11
CSOURCE = main.cpp
CHEADER =
OBJECTS = ${CSOURCE:.cpp=.o}
EXECBIN = blasteroids
all : ${EXECBIN}
${EXECBIN} : ${OBJECTS}
${GCC} -o $@ ${OBJECTS}
%.o : %.cpp
${GCC} -c $<
clean :
- rm ${OBJECTS} ${EXECBIN}
again :
${MAKE} clean all
Basically, I keep getting the "ERROR LOADING FONT!" message even though everything is now compiling and initializing. Anything I should be checking for specifically???
.text+0x1b): undefined reference to `al_install_system'
Originally Posted by MutantJohn
