1 files changed, 72 insertions, 0 deletions
diff --git a/Source/Internal/timer.h b/Source/Internal/timer.h
new file mode 100644
index 00000000..1683f1b1
--- /dev/null
+++ b/Source/Internal/timer.h
@@ -0,0 +1,72 @@
+//-----------------------------------------------------------------------------
+//           Name: timer.h
+//      Developer: Wolfire Games LLC
+//         Author: David Rosen
+//    Description: The timer handles fixed or dynamic timeSteps
+//        License: Read below
+//-----------------------------------------------------------------------------
+//
+//   Copyright 2022 Wolfire Games LLC
+//
+//   Licensed under the Apache License, Version 2.0 (the "License");
+//   you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+//       http://www.apache.org/licenses/LICENSE-2.0
+//
+//   Unless required by applicable law or agreed to in writing, software
+//   distributed under the License is distributed on an "AS IS" BASIS,
+//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+//   limitations under the License.
+//
+//-----------------------------------------------------------------------------
+#pragma once
+
+#include <vector>
+#include <cstdint>
+
+struct TimedSlowMotionLayer {
+    uint32_t end_time;
+	uint32_t start_time;
+	float target_time_scale;
+};
+
+class Timer {
+public:
+	Timer();
+
+	float target_time_scale;
+	float time_scale;
+	float timestep;
+	float timestep_error;
+	float game_time;
+    float wall_time;
+    uint32_t wall_ticks;
+    int updates_since_last_frame;
+    int simulations_per_second;
+    uint64_t frame_count;
+
+	void AddTimedSlowMotionLayer( float target_time_scale, float how_long, float delay = 0.0f );
+    void UpdateWallTime();
+	void Update();
+	void SetStepFrequency(int sims);
+	int GetStepsNeeded();
+	void ReportFrameForFPSCount();
+	int GetFramesPerSecond();
+	float GetFrameTime();
+	float GetSlowestFrameTime();
+	float GetFastestFrameTime();
+	float GetInterpWeight();
+	float GetInterpWeightX(int num, int progress);
+    float GetRenderTime();
+    float GetWallTime();
+    uint32_t GetWallTicks();
+	float GetAverageFrameTime();
+
+private:
+    uint32_t last_tick;
+	static const int NUM_AVERAGED_FRAMES = 30;
+    uint64_t frame[NUM_AVERAGED_FRAMES];
+    std::vector<TimedSlowMotionLayer> timed_slow_motion_layers;
+};