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| [al_draw_text] really slow |
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nicolas_l
Member #13,340
August 2011
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Hi, i'm having problems with displaying text with Allegro 5. Whenever i display a text in screen, the framerate drops from ~60 to ~12. Here is an example i made where this is happening: 1#include <stdio.h>
2#include <allegro5/allegro.h>
3#include <allegro5/allegro_font.h>
4#include <allegro5/allegro_ttf.h>
5
6const int FPS = 60;
7int main()
8{
9 al_init();
10
11 al_init_font_addon();
12 al_init_ttf_addon();
13 al_install_keyboard();
14
15 ALLEGRO_EVENT_QUEUE* event_queue = al_create_event_queue();
16 ALLEGRO_TIMER* timer = al_create_timer(1.0 / FPS);
17 al_register_event_source(event_queue, al_get_keyboard_event_source());
18 al_register_event_source(event_queue, al_get_timer_event_source(timer));
19
20 ALLEGRO_DISPLAY *display = display = al_create_display(640,480);
21 ALLEGRO_FONT *font = al_load_ttf_font("ARIAL.ttf",20,0 );
22
23 ALLEGRO_BITMAP* text_img = al_create_bitmap(al_get_text_width(font,"HelloWorld!"), al_get_font_ascent(font));
24 al_set_target_bitmap(text_img);
25 al_clear_to_color(al_map_rgb(0,0,0));
26 al_draw_text(font,al_map_rgb(255,255,255), 0,0,0,"HelloWorld!");
27 al_set_target_bitmap(al_get_backbuffer(display));
28
29 char is_pressed_space = false;
30 char is_pressed_enter = false;
31
32 int TT = time(NULL);
33 int fps=0, fps_temp=0;
34
35 al_clear_to_color(al_map_rgb(0,0,0));
36
37 al_flip_display();
38 al_start_timer(timer);
39
40 int redraw = false;
41 while(1){
42
43
44 ALLEGRO_EVENT ev;
45 al_wait_for_event(event_queue, &ev);
46 if(ev.type == ALLEGRO_EVENT_TIMER) {
47 redraw = true;
48 }
49 if(ev.type == ALLEGRO_EVENT_KEY_DOWN)
50 {
51 if (ev.keyboard.keycode==ALLEGRO_KEY_SPACE)
52 is_pressed_space=true;
53 if (ev.keyboard.keycode==ALLEGRO_KEY_ENTER)
54 is_pressed_enter=true;
55 }
56 if(ev.type == ALLEGRO_EVENT_KEY_UP)
57 {
58 if (ev.keyboard.keycode==ALLEGRO_KEY_SPACE)
59 is_pressed_space=false;
60 if (ev.keyboard.keycode==ALLEGRO_KEY_ENTER)
61 is_pressed_enter=false;
62 if (ev.keyboard.keycode==ALLEGRO_KEY_ESCAPE)
63 break;
64 }
65
66 if(redraw && al_is_event_queue_empty(event_queue))
67 {
68 redraw = false;
69
70 al_clear_to_color(al_map_rgb(0,0,0));
71 if (is_pressed_space)
72 al_draw_textf(font,al_map_rgb(255,255,255), 100,100,0,"FPS: %d",fps);
73 if (is_pressed_enter)
74 al_draw_bitmap(text_img, 200, 200, 0);
75 al_flip_display();
76
77 fps_temp++;
78 int tt = time(NULL);
79 if (tt != TT)
80 {
81 TT=tt;
82 fps = fps_temp;
83 fps_temp=0;
84 printf("%d\n",fps);
85 }
86 }
87
88
89
90 }
91 al_destroy_display(display);
92 return 0;
93}
When nothing is being shown the fps is 60, and it doesn't change when i show the bitmap, but when i show the text it is 12-13. I'm linking with liballegro-5.0.4-monolith-md-debug.a, but i've also tried with the other options, but no change. |
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Matthew Leverton
Supreme Loser
January 1999
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What video card does it have? Attaching the allegro.log file may help. If you draw this text beforehand (to cache things), does it speed it up: "FPS: 0123456789"? |
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nicolas_l
Member #13,340
August 2011
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it has a integrated Intel GMA500 (it's not a good card, and it sucks in openGL (could that be the cause?)) drawing the text before doesn't change anything I've attached allegro.log |
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Matthew Leverton
Supreme Loser
January 1999
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It's using Direct3D at the moment. You can try OpenGL: #include <allegro5/allegro_opengl.h> //... al_set_new_display_flags(ALLEGRO_OPENGL); al_create_display( ... );
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nicolas_l
Member #13,340
August 2011
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Ok. But with OpenGL the program won't start (but that is becouse the computer, i've had problems with other openGL games (advice: never buy an netbook with gma500) |
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Edgar Reynaldo
Major Reynaldo
May 2007
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nicolas_l said: The compiler says that line is undefined - one too many 'display's there. I compiled your program against Allegro 5.1 SVN and had no problems at all using consola.ttf. It all ran at 60 fps. This was on a 2.1Ghz dual core Turion 64 laptop with integrated ATI Radeon X1270 though. Oh, and please fix your code formatting next time - it's really hard to read. My Website! | EAGLE GUI Library Demos | My Deviant Art Gallery | Spiraloid Preview | A4 FontMaker | Skyline! (Missile Defense) Eagle and Allegro 5 binaries | Older Allegro 4 and 5 binaries | Allegro 5 compile guide |
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