first commit

src/engine/utils/timer.cpp

@@ -0,0 +1,65 @@
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+
+#include "timer.h"
+
+#if defined(WIN32) || defined(_WIN32)
+class SystemTimerWin32 : public SystemTimer
+{
+public:
+	void Init();
+	void Shutdown();
+
+	void Update();
+
+	float GetTime();
+	float GetDelta();
+
+private:
+	LARGE_INTEGER m_frequency;
+	LARGE_INTEGER m_startTime;
+	LARGE_INTEGER m_endTime;
+
+	float m_floatFrequency;
+	float m_deltaTime;
+};
+
+static SystemTimerWin32 s_system_timer_win32;
+SystemTimer* g_systemTimer = (SystemTimer*)&s_system_timer_win32;
+
+void SystemTimerWin32::Init()
+{
+	QueryPerformanceFrequency(&m_frequency);
+	m_floatFrequency = (float)m_frequency.QuadPart;
+
+	QueryPerformanceCounter(&m_startTime);
+	m_startTime = m_endTime;
+}
+
+void SystemTimerWin32::Shutdown()
+{
+}
+
+void SystemTimerWin32::Update()
+{
+	QueryPerformanceCounter(&m_startTime);
+	m_deltaTime = static_cast<float>(m_startTime.QuadPart - m_endTime.QuadPart) / m_frequency.QuadPart;
+
+	if (m_deltaTime > 10.0f)
+		m_deltaTime = 0.0f;
+
+	m_endTime = m_startTime;
+}
+
+float SystemTimerWin32::GetTime()
+{
+	LARGE_INTEGER time;
+	QueryPerformanceCounter(&time);
+	return static_cast<float>(time.QuadPart / m_frequency.QuadPart);
+}
+
+float SystemTimerWin32::GetDelta()
+{
+	return m_deltaTime;
+}
+#endif // WIN32