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| Timing and Bitmap Troubles |
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oobtim
Member #10,381
November 2008
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sigh Been fiddling with my timers and main loop with regards to the timers and now have a loop which boils down to: 1while(!doExit)
2 {
3 //test for an event
4 bool get_event = al_wait_for_event_until(event_queue, &ev, &timeout);
5
6 //trigger a redraw or update
7 if(ev.type == ALLEGRO_EVENT_TIMER)
8 {
9 if(ev.timer.source == animTimer)
10 {
11 redraw = true;
12 }
13 else if(ev.timer.source == updateTimer)
14 {
15 update = true;
16 }
17 }else if(ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE) {
18 break;
19 }else if(ev.type == ALLEGRO_EVENT_KEY_DOWN)
20 {
21 switch(ev.keyboard.keycode) {
22 case ALLEGRO_KEY_UP:
23 key[KEY_UP] = true;
24 break;
25 case ALLEGRO_KEY_DOWN:
26 key[KEY_DOWN] = true;
27 break;
28 case ALLEGRO_KEY_LEFT:
29 key[KEY_LEFT] = true;
30 break;
31 case ALLEGRO_KEY_RIGHT:
32 key[KEY_RIGHT] = true;
33 break;
34 case ALLEGRO_KEY_1:
35 player.playerSpeed += 0.1; //purely for testing
36 break;
37 case ALLEGRO_KEY_2:
38 player.playerSpeed -= 0.1; //purely for testing
39 break;
40 }
41
42 }else if(ev.type == ALLEGRO_EVENT_KEY_UP)
43 {
44 //test if a key has been released
45 switch(ev.keyboard.keycode) {
46 case ALLEGRO_KEY_UP:
47 key[KEY_UP] = false;
48 break;
49
50 case ALLEGRO_KEY_DOWN:
51 key[KEY_DOWN] = false;
52 break;
53
54 case ALLEGRO_KEY_LEFT:
55 key[KEY_LEFT] = false;
56 break;
57
58 case ALLEGRO_KEY_RIGHT:
59 key[KEY_RIGHT] = false;
60 break;
61
62 case ALLEGRO_KEY_ESCAPE:
63 doExit = true;
64 break;
65 }
66 }
67
68 //game logic
69 if(al_is_event_queue_empty(event_queue) && update){
70 player.update(key); //tells the player what key has been pressed
71
72 //will they hit something if they move using this key?
73 if(playerBGCollision(player)){
74 player.hasCollided(); //if so make them stand still (i.e. velocity == 0)
75 }
76
77 player.move(); //update position variables
78 update = false;
79 }
80
81 //drawing
82 if(al_is_event_queue_empty(event_queue) && redraw) {
83
84 al_clear_to_color(al_map_rgb(0,0,0)); //clear
85 MapDrawBG(plotMapx,plotMapy,0,0,SWIDTH,SHEIGHT);
86 player.plot(plotMapx, plotMapy);
87 MapDrawFG(plotMapx,plotMapy,0,0,SWIDTH,SHEIGHT,0);
88
89 al_flip_display();
90
91 redraw = false;
92 }
93
94 }
95 al_destroy_display(display);
96 al_destroy_event_queue(event_queue);
97 return 0;
98};
From reading forums this was said to be the recommended way of carrying out the game loop (if you haven't noticed it is also based on the Allegro 5 tutorials). But for some reason there is a lag in the timing (speeds up and down), not big, but noticeable. Plus the screen flickers slightly as it scrolls. I thought that this would be down to loading memory bitmaps rather than video bitmaps. But they are only a few 100kB! I loaded the bitmaps for the player sprite AFTER I created the display anyway to make them video but to no avail. I checked the flags of the bitmaps and they came out with a flag that I couldn't identify. So...
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l j
Member #10,584
January 2009
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Flags are stored bitwise if (myFlags & FLAG_SOME_FLAG) { // Flag is enabled }
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oobtim
Member #10,381
November 2008
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Thank you, that sorts out whether I have video/memory bitmaps Anything wrong with my loop though, as the glitch still remains?:-/ Is there something wrong with the way the updates and redraws are called? Updates and redraws are done 60 times a second and I have a separate timer for each. EDIT Sorted it |
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