1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
<xml>
<head>
<title>Tips and tricks</title>
</head>
<body>
<h3>Calculating frames per second (fps)</h3>
<p>Author: Sphair</p>
<p>Often you want to know how fast or slow your game is running, and displaying
a FPS counter can be a handy debug-tool.</p>
<code>
class Game
{
public:
void run();
void update();
void draw();
int calc_fps(int frame_time);
CL_Font font_fps;
int fps;
};
void Game::run()
{
CL_ResourceManager resources("resources.xml");
font_fps = CL_Font("font_gray", &resources);
while(!CL_Keyboard::get_keycode(CL_KEY_ESCAPE))
{
update();
draw();
CL_Display::flip();
CL_System::keep_alive();
};
}
void Game::update()
{
// Calculate time since last update
static int start_time = CL_System::get_time();
int cur_time = CL_System::get_time();
int delta_time = cur_time - start_time;
start_time = cur_time;
fps = calc_fps(delta_time);
}
int Game::calc_fps(int frame_time)
{
static int fps_result = 0;
static int fps_counter = 0;
static int total_time = 0;
total_time += frame_time;
if(total_time >= 1000) // One second has passed
{
fps_result = fps_counter + 1;
fps_counter = total_time = 0;
}
fps_counter++; // Increase fps
return fps_result;
}
void Game::draw()
{
CL_Display::clear();
font_fps.draw(0, 0, "fps: " + CL_String::from_int(fps));
}
</code>
</body>
</xml>
|
