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| al_draw_text() Performance Issues |
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Cherubrad
Member #15,544
March 2014
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Hey! I'm running into some major performance issues with Allegro 5 when using the al_draw_text() function. I know my problem is arising because I'm forced to use: 1al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP);
2//load fonts
3al_set_new_bitmap_flags(ALLEGRO_VIDEO_BITMAP);
Otherwise my text will be missing characters. Currently, scrolling text melts my CPU. Does anyone have any ideas how I could work through this hurdle? As far as I'm aware my openGL and Allegro are both up to date. 1
2int main()
3{
4
5 struct Data {
6 ALLEGRO_FONT *f1, *f2;
7 ALLEGRO_DISPLAY *display;
8 ALLEGRO_EVENT_QUEUE *queue;
9 ALLEGRO_COLOR white;
10
11
12 } data;
13
14 //Initializing Allegro
15 al_init();
16 al_init_font_addon();
17 al_init_ttf_addon();
18 al_install_keyboard();
19
20
21 data.white = al_map_rgb(255,255,255);
22
23
24 const char *font_file = "arial.ttf";
25
26 //Setting OPENGL
27 al_set_new_display_flags(ALLEGRO_OPENGL);
28
29 //Creating my display
30 data.display = al_create_display(1024, 576);
31
32 //PROBLEM ARISES HERE:
33 //Text wont draw on video
34 al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP);
35 data.f1 = al_load_ttf_font(font_file, 25, 0);
36 data.f2 = al_load_ttf_font(font_file, 15, 0);
37 al_set_new_bitmap_flags(ALLEGRO_VIDEO_BITMAP);
38
39
40 //creates the queue
41 data.queue = al_create_event_queue();
42
43 bool done = false;
44 int y = 600;
45 int moveSpeed = 5;
46
47 ALLEGRO_KEYBOARD_STATE keyState;
48 ALLEGRO_EVENT event;
49 ALLEGRO_TIMER *timer = al_create_timer(1.0 / 24);
50 al_register_event_source(data.queue, al_get_timer_event_source(timer));
51 al_register_event_source(data.queue, al_get_display_event_source(data.display));
52 al_start_timer(timer);
53
54 while(!done)
55 {
56 al_wait_for_event(data.queue, &event);
57 if(event.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
58 {
59 done = true;
60 }
61 if(event.type == ALLEGRO_EVENT_TIMER)
62 {
63 al_get_keyboard_state(&keyState);
64 if(al_key_down(&keyState, ALLEGRO_KEY_ESCAPE))
65 {
66 done = true;
67 }
68 al_clear_to_color(al_map_rgb(0, 0, 0));
69 //Loop to draw same line of text 10 times
70 for(int i =0; i < 10; i++)
71 al_draw_text(data.f1, data.white, 512, y+(30*i), ALLEGRO_ALIGN_CENTER, "CREDDSDADSADSADSADAITS");
72 al_flip_display();
73 //I'm just moving it 1 pixel per update
74 y--;
75 }
76 if(y <= 0)
77 break;
78
79
80
81 }
82
83
84
85 al_destroy_font(data.f1);
86 al_destroy_font(data.f2);
87
88 al_destroy_display(data.display);
89 al_destroy_event_queue(data.queue);
90
91 return 0;
92
93}
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beoran
Member #12,636
March 2011
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Which version of Allegro are you using? This might be a bug, so please try the latest possible version of allegro 5 and see if the error persists. Also, what do the Allegro example programs do? Do they work correctly? |
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#00JMP00
Member #14,740
November 2012
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Hi! I don't know exactly what you are doing, but it seems as if there was a logic bug in your textroutine; 1
270 for(int i =0; i < 10; i++)
3 71 al_draw_text(data.f1, data.white, 512, y+(30*i), ALLEGRO_ALIGN_CENTER, "CREDDSDADSADSADSADAITS");
4 72 al_flip_display();
5 73 //I'm just moving it 1 pixel per update
6 74 y--;
7 75 }
The text y-position is incremented you the for loop y+(30*i), but decremented at the same time. Is this by accident or should it be like that??? |
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Pho75_
Member #12,377
November 2010
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Try using video bitmaps and pre-cache JUST the font glyphs that you need before your game loop. font = al_load_ttf_font(font_file, 25, 0); al_draw_text(font, al_map_rgba(0,0,0,0), 0, 0, 0, "!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~");
I've run into font-caching problems with Allegro5 in the past: |
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Cherubrad
Member #15,544
March 2014
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@beoran It writes multiple lines of the same string as text, moving it upwards at ~24 pixels per second. Think credits at the end of a movie. It only serves as a test. @#00JMP00 It's a simple loop to draw multiple lines of the same text (10 in this example) that are right below each other. The y-- simply moves the entire body of text -24 pixels per second (assuming my CPU didn't melt from drawing text...). I've run a more optimal version keep track of time vs movement, but it also runs into the same issue after a handful of text lines are being displayed. @Pho75_ |
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Pho75_
Member #12,377
November 2010
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Cherubrad said: Thank you, I'll give that a try. Just one question, if my game runs / calls multiple different loops (for different event related displays) will that affect the cache? They're all sharing the same queue / timer.
I'm not sure I understand your question. If you're asking if you can use a video bitmap or memory bitmap |
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Edgar Reynaldo
Major Reynaldo
May 2007
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Bitmaps in A5 are connected to a display, and are generally compatible with that display only - you have to make the selected display active before loading any fonts or images you want to use on that display. Read more here about how to make a display active, with al_set_target_bitmap and you can check with al_get_current_display(). 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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