collect timing information

[blank.git] / src / app / FrameCounter.hpp

diff --git a/src/app/FrameCounter.hpp b/src/app/FrameCounter.hpp
new file mode 100644 (file)
index 0000000..069f622
--- /dev/null
+++ b/src/app/FrameCounter.hpp
@@ -0,0 +1,60 @@
+#ifndef BLANK_APP_FRAMECOUNTER_HPP_
+#define BLANK_APP_FRAMECOUNTER_HPP_
+
+#include <iosfwd>
+#include <SDL.h>
+
+
+namespace blank {
+
+class FrameCounter {
+
+public:
+       void EnterFrame() noexcept;
+       void EnterHandle() noexcept;
+       void ExitHandle() noexcept;
+       void EnterUpdate() noexcept;
+       void ExitUpdate() noexcept;
+       void EnterRender() noexcept;
+       void ExitRender() noexcept;
+       void ExitFrame() noexcept;
+
+       float AvgHandle() const noexcept { return avg.handle; }
+       float AvgUpdate() const noexcept { return avg.update; }
+       float AvgRender() const noexcept { return avg.render; }
+       float AvgFrame() const noexcept { return avg.total; }
+       float AvgRunning() const noexcept { return avg.handle + avg.update + avg.render; }
+       float AvgWaiting() const noexcept { return avg.total - AvgRunning(); }
+
+       bool Changed() const noexcept { return changed; }
+
+       void Print(std::ostream &) const;
+
+private:
+       int Tick() noexcept;
+
+private:
+       static constexpr int NUM_FRAMES = 32;
+       static constexpr float factor = 1.0f / float(NUM_FRAMES);
+
+       template<class T>
+       struct Frame {
+               T handle = T(0);
+               T update = T(0);
+               T render = T(0);
+               T total = T(0);
+       };
+
+       Uint32 last_enter = 0;
+       Uint32 last_tick = 0;
+
+       int cur_frame = 0;
+       Frame<int> running = Frame<int>{};
+       Frame<float> avg = Frame<float>{};
+       bool changed = false;
+
+};
+
+}
+
+#endif