72 lines
2.1 KiB
C#
72 lines
2.1 KiB
C#
using System;
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namespace HTraceSSGI.Scripts.Extensions.CameraHistorySystem
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{
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public class CameraHistorySystem<T> where T : struct, ICameraHistoryData
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{
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private const int MaxCameraCount = 4; // minimum 2
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private int _cameraHistoryIndex;
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private readonly T[] _cameraHistoryData = new T[MaxCameraCount];
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public int UpdateCameraHistoryIndex(int currentCameraHash)
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{
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_cameraHistoryIndex = GetCameraHistoryDataIndex(currentCameraHash);
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return _cameraHistoryIndex;
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}
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private int GetCameraHistoryDataIndex(int cameraHash)
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{
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// Unroll manually for MAX_CAMERA_COUNT = 4
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if (_cameraHistoryData[0].GetHash() == cameraHash) return 0;
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if (_cameraHistoryData[1].GetHash() == cameraHash) return 1;
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if (_cameraHistoryData[2].GetHash() == cameraHash) return 2;
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if (_cameraHistoryData[3].GetHash() == cameraHash) return 3;
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return -1; // new camera
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}
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public void UpdateCameraHistoryData()
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{
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bool cameraHasChanged = _cameraHistoryIndex == -1;
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if (cameraHasChanged)
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{
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const int lastIndex = MaxCameraCount - 1;
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if (_cameraHistoryData[lastIndex] is IDisposable disposable)
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disposable.Dispose();
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// Shift the camera history data back by one
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Array.Copy(_cameraHistoryData, 0, _cameraHistoryData, 1, lastIndex);
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_cameraHistoryIndex = 0;
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_cameraHistoryData[0] = new T(); //it's critical
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}
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}
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public ref T GetCameraData()
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{
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return ref _cameraHistoryData[_cameraHistoryIndex];
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}
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public T[] GetCameraDatas()
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{
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return _cameraHistoryData;
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}
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public void SetCameraData(T data)
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{
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_cameraHistoryData[_cameraHistoryIndex] = data;
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}
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public void Cleanup()
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{
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for (int index = 0; index < _cameraHistoryData.Length; index++)
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{
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_cameraHistoryData[index] = default;
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}
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}
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}
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}
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