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[A5] Timer & Keyboard issues
Joined
Member #12,691
March 2011

Hi to all.
I am new to the forum and i'm trying to make my very first game with Allegro 5.
As it is new i can't find so much examples on the internet but with the help of the wiki i made something.
This "simple" program works like a charm exept for the fact that the scrolling of the choices in the menu is very slow. Another problem is that if i draw a filled circle at line 141, when i start the program the whole menu goes away and i have to go up and down with the keyboard 3-4 times and the menu comes back again.

Can you help me with the debugging?
Thanks in advance.

#SelectExpand
1#include <stdio.h> 2#include <allegro5/allegro.h> 3#include <allegro5/allegro_font.h> 4#include <allegro5/allegro_ttf.h> 5#include <allegro5/allegro_audio.h> 6#include <allegro5/allegro_acodec.h> 7#include <allegro5/allegro_image.h> 8#include <allegro5/allegro_primitives.h> 9#define SCREEN_W 800 10#define SCREEN_H 600 11#define FPS 60 12 13int main() 14{ 15 if(!al_init()) 16 { 17 fprintf(stderr, "Failed to initialize Allegro.\n"); 18 system("pause"); 19 return -1; 20 } 21 if(!al_install_keyboard()) 22 { 23 fprintf(stderr, "Failed to initialize the keyboard!\n"); 24 system("pause"); 25 return -1; 26 } 27 al_init_font_addon(); 28 if (!al_init_ttf_addon()) 29 { 30 fprintf(stderr, "Failed to initialize the TTF addon!\n"); 31 system("pause"); 32 return -1; 33 } 34 if (!al_install_audio()) 35 { 36 fprintf(stderr, "Failed to initialize the audio addon!\n"); 37 system("pause"); 38 return -1; 39 } 40 if (!al_init_acodec_addon()) 41 { 42 fprintf(stderr, "Failed to initialize the acodec addon!\n"); 43 system("pause"); 44 return -1; 45 } 46 if (!al_reserve_samples(2)) 47 { 48 fprintf(stderr, "Failed to reserve the samples!\n"); 49 system("pause"); 50 return -1; 51 } 52 if (!al_init_image_addon()) 53 { 54 fprintf(stderr, "Failed to initialize image addon!\n"); 55 system("pause"); 56 return -1; 57 } 58 if(!al_init_primitives_addon()) 59 { 60 fprintf(stderr, "Failed to initialize the primitives addon!\n"); 61 system("pause"); 62 return -1; 63 } 64 65 ALLEGRO_FONT *font = al_load_ttf_font("pirulen.ttf",96,0 ); // load the font | Font from Larabie Free Fonts 66 ALLEGRO_FONT *font2 = al_load_ttf_font("pirulen.ttf", 30,0 ); // load the font | Font from Larabie Free Fonts 67 ALLEGRO_FONT *font3 = al_load_ttf_font("pirulen.ttf", 12,0 ); // load the font | Font from Larabie Free Fonts 68 ALLEGRO_DISPLAY *display = NULL; 69 ALLEGRO_EVENT_QUEUE *event_queue = NULL; 70 ALLEGRO_SAMPLE *sample = NULL; 71 ALLEGRO_BITMAP *sfondo = NULL; 72 ALLEGRO_TIMER *timer = NULL; 73 74 timer = al_create_timer(1.0 / FPS); 75 76 bool redraw = true; 77 78 bool doexit = false; 79 bool inizia = false;//false = iniziano i rossi; true = iniziano i gialli 80 bool suoni = false;//true = attivati; false = spenti 81 int index = 0;//indica su quale voce del menu sono posizionato inizialmente 82 83 //carico lo sfondo 84 sfondo = al_load_bitmap("background_t_p.jpg"); 85 86 //creo il display principale 87 display = al_create_display(SCREEN_W,SCREEN_H); 88 89 //carico la musica 90 sample = al_load_sample("around-the-world.wav"); 91 92 if (!sample) 93 { 94 fprintf(stderr, "Failed to load sample.\n"); 95 system("pause"); 96 return -1; 97 } 98 99 if (!display) 100 { 101 fprintf(stderr, "Failed to create display.\n"); 102 system("pause"); 103 return -1; 104 } 105 106 event_queue = al_create_event_queue(); 107 108 if(!event_queue) 109 { 110 fprintf(stderr, "failed to create event_queue!\n"); 111 al_destroy_display(display); 112 return -1; 113 } 114 115 al_register_event_source(event_queue, al_get_timer_event_source(timer)); 116 al_register_event_source(event_queue, al_get_keyboard_event_source()); 117 al_register_event_source(event_queue, al_get_display_event_source(display)); 118 119 al_start_timer(timer); 120 121 while(!doexit) 122 { 123 ALLEGRO_EVENT ev; 124 al_wait_for_event(event_queue, &ev); 125 126 if ((ev.type == ALLEGRO_EVENT_TIMER)&&(redraw)) 127 { 128 printf("entro"); 129 redraw = false; 130 131 al_draw_bitmap(sfondo, 0, 0, 0); 132 133 al_draw_text(font, al_map_rgb(204,0,0), SCREEN_W/2, (SCREEN_H/8)-10,ALLEGRO_ALIGN_CENTRE, "FORZA 4");// draw the text 134 135 if (index==0) al_draw_text(font2, al_map_rgb(255,0,0), SCREEN_W/2-20, (SCREEN_H/2)-60,ALLEGRO_ALIGN_CENTRE, "GIOCA");// draw the text 136 else al_draw_text(font2, al_map_rgb(0,0,0), SCREEN_W/2-20, (SCREEN_H/2)-60,ALLEGRO_ALIGN_CENTRE, "GIOCA");// draw the text 137 138 if (index==1) al_draw_text(font2, al_map_rgb(255,0,0), SCREEN_W/2-10, (SCREEN_H/2)-20,ALLEGRO_ALIGN_CENTRE, "INIZIA < >");// draw the text 139 else al_draw_text(font2, al_map_rgb(0,0,0), SCREEN_W/2-10, (SCREEN_H/2)-20,ALLEGRO_ALIGN_CENTRE, "INIZIA < >");// draw the text 140 141 if (inizia) al_draw_text(font2, al_map_rgb(255,255,0), SCREEN_W/2+55, (SCREEN_H/2)-20,ALLEGRO_ALIGN_CENTRE, "O");// draw the text 142 else al_draw_text(font2, al_map_rgb(255,0,0), SCREEN_W/2+55, (SCREEN_H/2)-20,ALLEGRO_ALIGN_CENTRE, "O");// draw the text 143 144 if (index==2) 145 { 146 al_draw_text(font2, al_map_rgb(255,0,0), SCREEN_W/2-70, (SCREEN_H/2)+20,ALLEGRO_ALIGN_CENTRE, "SUONI");// draw the text 147 148 if (suoni) al_draw_text(font2, al_map_rgb(255,0,0), SCREEN_W/2+50, (SCREEN_H/2)+20,ALLEGRO_ALIGN_CENTRE, "<ON>");// draw the text 149 else al_draw_text(font2, al_map_rgb(255,0,0), SCREEN_W/2+50, (SCREEN_H/2)+20,ALLEGRO_ALIGN_CENTRE, "<OFF>");// draw the text 150 } 151 else 152 { 153 al_draw_text(font2, al_map_rgb(0,0,0), SCREEN_W/2-70, (SCREEN_H/2)+20,ALLEGRO_ALIGN_CENTRE, "SUONI");// draw the text 154 155 if (suoni) al_draw_text(font2, al_map_rgb(0,0,0), SCREEN_W/2+50, (SCREEN_H/2)+20,ALLEGRO_ALIGN_CENTRE, "<ON>");// draw the text 156 else al_draw_text(font2, al_map_rgb(0,0,0), SCREEN_W/2+50, (SCREEN_H/2)+20,ALLEGRO_ALIGN_CENTRE, "<OFF>");// draw the text 157 } 158 159 if (index==3) al_draw_text(font2, al_map_rgb(255,0,0), SCREEN_W/2-20, (SCREEN_H/2)+100,ALLEGRO_ALIGN_CENTRE, "ESCI");// draw the text 160 else al_draw_text(font2, al_map_rgb(0,0,0), SCREEN_W/2-20, (SCREEN_H/2)+100,ALLEGRO_ALIGN_CENTRE, "ESCI");// draw the text 161 162 al_draw_text(font3, al_map_rgb(0,0,0), SCREEN_W-100, SCREEN_H-50,ALLEGRO_ALIGN_CENTRE, "by Joined ® 2011");// draw the text 163 164 al_flip_display(); 165 } 166 else if(ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE) 167 break; 168 else if (ev.type == ALLEGRO_EVENT_KEY_DOWN) 169 { 170 switch(ev.keyboard.keycode) 171 { 172 case ALLEGRO_KEY_UP: 173 { 174 if (index>0) 175 { 176 index--; 177 redraw = true; 178 } 179 break; 180 } 181 case ALLEGRO_KEY_DOWN: 182 { 183 if (index<3) 184 { 185 index++; 186 redraw = true; 187 } 188 break; 189 } 190 case ALLEGRO_KEY_LEFT: 191 { 192 if (index == 1) 193 { 194 if (inizia == true) 195 { 196 inizia = false; 197 redraw = true; 198 } 199 } 200 else if (index == 2) 201 { 202 if (suoni == true) 203 { 204 suoni = false; 205 redraw = true; 206 al_stop_samples(); 207 } 208 } 209 break; 210 } 211 case ALLEGRO_KEY_RIGHT: 212 { 213 if (index == 1) 214 { 215 if (inizia == false) 216 { 217 inizia = true; 218 redraw = true; 219 } 220 } 221 else if (index == 2) 222 { 223 if (suoni == false) 224 { 225 suoni = true; 226 redraw = true; 227 al_play_sample(sample, 1.0, 0.0, 1.0, ALLEGRO_PLAYMODE_LOOP, NULL); 228 } 229 } 230 break; 231 } 232 case ALLEGRO_KEY_ENTER: 233 { 234 if (index == 3) 235 doexit=true; 236 break; 237 } 238 } 239 } 240 } 241 242 al_destroy_display(display); 243 al_uninstall_audio(); 244 al_destroy_timer(timer); 245 al_destroy_bitmap(sfondo); 246 al_destroy_event_queue(event_queue); 247 248 return 0; 249}

kenmasters1976
Member #8,794
July 2007

As for your program being slow I suggest you move the addon initialization code (like primitives and font addons) and put it after display creation. That should help.

Peter Wang
Member #23
April 2000

As a clarification of the previous comment, it's not so much that you should move the initialisation code after creating the display, but you should load bitmaps and fonts after creating the display. Otherwise the bitmaps will be created as 'memory' bitmaps, which are always drawn with relatively slow software routines, instead of 'video' bitmaps, which can take advantage of hardware rendering.

Edgar Reynaldo
Member #8,592
May 2007
avatar

Your structure is like this (psuedocode) :

while (!quit) {
   wait_for_event();
   if (is_timer_event() && redraw) {
      Redraw();
      redraw = false;
   }
   // logic
   if (stuff_changes) {redraw = true;}
}

The problem with it is that redraw may be set to true by your logic, but it has to wait until the next event fires to perform the Redraw(). You won't have to wait very long because of the timer events, but it's still a little funky.

A better layout would be :

while (!quit) {
   while (1) {
      wait_for_event();
      if (stuff_changes) {redraw = true;}
      if (is_timer_event()) {update_logic();redraw = true;}
      if (!events_in_queue) {break;}
   }
   if (redraw) {
      Redraw();
      redraw = false;
   }
}

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