blob: 584a408364c3794d9707dab5c8573467a4661068 (
plain)
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
81
|
#pragma once
#include <cstdint>
namespace crepe{
class LoopTimer {
public:
/**
* \brief Get the singleton instance of LoopTimer.
*
* \return A reference to the LoopTimer instance.
*/
static LoopTimer& getInstance();
/**
* \brief Get the current delta time for the current frame.
*
* \return Delta time in seconds since the last frame.
*/
double get_delta_time() const;
/**
* \brief Get the current game time.
*
* \note The current game time may vary from the real-world elapsed time.
* It is the cumulative sum of each frame's delta time.
*
* \return Elapsed game time in milliseconds.
*/
int get_current_time() const;
/**
* \brief Set the target frames per second (FPS).
*
* \param fps The number of frames that should be rendered per second.
*/
void set_fps(int fps);
/**
* \brief Get the current frames per second (FPS).
*
* \return Current FPS.
*/
int get_fps() const;
/**
* \brief Get the current game scale.
*
* \return The current game scale, where 0 = paused, 1 = normal speed, and values > 1 speed up the game.
*/
double get_game_scale() const;
/**
* \brief Set the game scale.
*
* \param game_scale The desired game scale (0 = pause, 1 = normal speed, > 1 = speed up).
*/
void set_game_scale(double game_scale);
private:
friend class LoopManager;
void start();
void enforce_frame_rate();
double get_fixed_delta_time() const;
double get_lag() const;
LoopTimer();
void update();
void advance_fixed_update();
private:
int fps = 50; ///< Current frames per second
double game_scale = 1; ///< Current game scale
double maximum_delta_time = 0.25; ///< Maximum delta time to avoid large jumps
double delta_time = 0; ///< Delta time for the current frame
double frame_target_time = 1.0 / fps; ///< Target time per frame in seconds
double fixed_delta_time = 0.02; ///< Fixed delta time for fixed updates
double elapsed_time = 0; ///< Total elapsed game time
double elapsed_fixed_time = 0; ///< Total elapsed time for fixed updates
uint64_t last_frame_time = 0; ///< Time of the last frame
};
} // namespace crepe::api
|