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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
#include <chrono>
#include <gtest/gtest.h>
#include <thread>
#define private public
#define protected public
#include <crepe/manager/LoopTimerManager.h>
#include <crepe/manager/Mediator.h>
using namespace std::chrono;
using namespace crepe;
class LoopTimerTest : public ::testing::Test {
protected:
Mediator mediator;
LoopTimerManager loop_timer {mediator};
void SetUp() override { loop_timer.start(); }
};
TEST_F(LoopTimerTest, EnforcesTargetFrameRate) {
// Set the target FPS to 60 (which gives a target time per frame of ~16.67 ms)
loop_timer.set_target_framerate(60);
auto start_time = steady_clock::now();
loop_timer.enforce_frame_rate();
auto elapsed_time = steady_clock::now() - start_time;
auto elapsed_ms = duration_cast<milliseconds>(elapsed_time).count();
// For 60 FPS, the target frame time is around 16.67ms
ASSERT_NEAR(elapsed_ms, 16.7, 5);
}
TEST_F(LoopTimerTest, SetTargetFps) {
// Set the target FPS to 120
loop_timer.set_target_framerate(120);
// Calculate the expected frame time (~8.33ms per frame)
duration_t expected_frame_time = std::chrono::duration<float>(1.0 / 120.0);
ASSERT_NEAR(loop_timer.frame_target_time.count(), expected_frame_time.count(), 0.001);
}
TEST_F(LoopTimerTest, DeltaTimeCalculation) {
// Set the target FPS to 60 (16.67 ms per frame)
loop_timer.set_target_framerate(60);
auto start_time = steady_clock::now();
loop_timer.update();
auto end_time = steady_clock::now();
// Check the delta time
duration_t delta_time = loop_timer.get_delta_time();
auto elapsed_time = duration_cast<seconds>(end_time - start_time).count();
// Assert that delta_time is close to the elapsed time
ASSERT_NEAR(delta_time.count(), elapsed_time, 1);
}
TEST_F(LoopTimerTest, DISABLED_getCurrentTime) {
// Set the target FPS to 60 (16.67 ms per frame)
loop_timer.set_target_framerate(60);
auto start_time = steady_clock::now();
// Sleep
std::this_thread::sleep_for(std::chrono::milliseconds(100));
loop_timer.update();
auto end_time = steady_clock::now();
// Get the elapsed time in seconds as a double
auto elapsed_time
= std::chrono::duration_cast<elapsed_time_t>(end_time - start_time).count();
ASSERT_NEAR(loop_timer.get_elapsed_time().count(), elapsed_time, 5);
}
TEST_F(LoopTimerTest, getFPS) {
// Set the target FPS to 60 (which gives a target time per frame of ~16.67 ms)
loop_timer.set_target_framerate(60);
auto start_time = steady_clock::now();
loop_timer.enforce_frame_rate();
auto elapsed_time = steady_clock::now() - start_time;
loop_timer.update();
unsigned int fps = loop_timer.get_fps();
auto elapsed_ms = duration_cast<milliseconds>(elapsed_time).count();
// For 60 FPS, the target frame time is around 16.67ms
ASSERT_NEAR(elapsed_ms, 16.7, 1);
ASSERT_NEAR(fps, 60, 2);
}
|