Moved Stars45 to StarsEx

1 files changed, 143 insertions, 0 deletions

diff --git a/StarsEx/Clock.cpp b/StarsEx/Clock.cpp
new file mode 100644
index 0000000..e5db6c3
--- /dev/null
+++ b/StarsEx/Clock.cpp
@@ -0,0 +1,143 @@
+/*  Starshatter: The Open Source Project
+    Copyright (c) 2021-2022, Starshatter: The Open Source Project Contributors
+    Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
+    Copyright (c) 1997-2006, Destroyer Studios LLC.
+*/
+
+#include "Clock.h"
+
+#include <chrono>
+
+static constexpr double NO_COMPRESSION {1.0};
+static constexpr double STARTING_DELTA {1.0 / 60.0};
+
+Clock* Clock::instance = nullptr;
+
+
+Clock*
+Clock::GetInstance()
+{
+    return instance;
+}
+
+
+bool
+Clock::Init()
+{
+    if (instance == nullptr) {
+        instance = new Clock();
+        return instance != nullptr;
+    }
+    return false;
+}
+
+
+void
+Clock::Close()
+{
+    if (instance != nullptr) {
+        delete instance;
+        instance = nullptr;
+    }
+}
+
+
+Clock::Clock() :
+    m_point {inner_clock::now()},
+    m_game_elapsed {inner_clock::duration::zero()},
+    m_real_elapsed {inner_clock::duration::zero()},
+    m_compression {NO_COMPRESSION},
+    m_delta {STARTING_DELTA},
+    m_gui_delta {STARTING_DELTA},
+    m_rate {0.0}
+{
+}
+
+
+void
+Clock::Set()
+{
+    m_point = inner_clock::now();
+    m_delta = STARTING_DELTA;
+    m_gui_delta = STARTING_DELTA;
+}
+
+
+double
+Clock::Step()
+{
+    const auto next = inner_clock::now();
+    const auto delta = next - m_point;
+    m_game_elapsed += std::chrono::duration_cast<inner_clock::duration>(delta * m_compression);
+    m_real_elapsed += delta;
+    const std::chrono::duration<double> seconds = delta;
+    m_delta = seconds.count() * m_compression;
+    m_gui_delta = seconds.count();
+    m_point = next;
+    m_rate = 1 / m_gui_delta;
+    return m_delta;
+}
+
+
+void
+Clock::ResetGameTime()
+{
+    m_game_elapsed = inner_clock::duration::zero();
+}
+
+
+void
+Clock::SkipGameTime(double seconds)
+{
+    const std::chrono::duration<double> skip {seconds};
+    m_game_elapsed += std::chrono::duration_cast<inner_clock::duration>(skip);
+}
+
+
+double
+Clock::Delta() const
+{
+    return m_delta;
+}
+
+
+double
+Clock::GuiDelta() const
+{
+    return m_gui_delta;
+}
+
+
+double
+Clock::Rate() const
+{
+    return m_rate;
+}
+
+
+double
+Clock::TimeCompression() const
+{
+    return m_compression;
+}
+
+
+Clock::count_type
+Clock::GameTime() const
+{
+    return std::chrono::duration_cast<elapsed_duration>(m_game_elapsed).count();
+}
+
+
+Clock::count_type
+Clock::RealTime() const
+{
+    return std::chrono::duration_cast<elapsed_duration>(m_real_elapsed).count();
+}
+
+
+void
+Clock::SetTimeCompression(double compression)
+{
+    m_compression = compression;
+}