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#include <chrono>
#include <gtest/gtest.h>
#include <thread>
#define private public
#define protected public
#include "api/LoopTimer.h"
using namespace std::chrono;
using namespace crepe;
class LoopTimerTest : public ::testing::Test {
protected:
LoopTimer loop_timer;
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_fps(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_GE(elapsed_ms, 16); // Make sure it's at least 16 ms (could be slightly more)
ASSERT_LE(elapsed_ms, 18); // Ensure it's not too much longer
}
TEST_F(LoopTimerTest, SetTargetFps) {
// Set the target FPS to 120
loop_timer.set_target_fps(120);
// Calculate the expected frame time (~8.33ms per frame)
auto expected_frame_time = std::chrono::duration<double>(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_fps(60);
auto start_time = steady_clock::now();
loop_timer.update();
auto end_time = steady_clock::now();
// Check the delta time
double delta_time = loop_timer.get_delta_time();
auto elapsed_time = duration_cast<milliseconds>(end_time - start_time).count();
// Assert that delta_time is close to the elapsed time
ASSERT_GE(delta_time, elapsed_time / 1000.0);
ASSERT_LE(delta_time, (elapsed_time + 2) / 1000.0);
}
TEST_F(LoopTimerTest, getCurrentTime) {
// Set the target FPS to 60 (16.67 ms per frame)
loop_timer.set_target_fps(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
= duration_cast<std::chrono::duration<double>>(end_time - start_time).count();
ASSERT_NEAR(loop_timer.get_current_time(), elapsed_time, 0.001);
}
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