80 lines
2.3 KiB
C#
80 lines
2.3 KiB
C#
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using System;
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using System.Collections.Generic;
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using Unity.Collections;
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using UnityEngine;
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namespace LeTai.Asset.TranslucentImage
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{
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/// <summary>
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/// Optimized for a small number of entries and the ability to be read in Jobs
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/// Since VP matrices are expensive to get, use IndexOf to check if the related Camera is cached before calling Add
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/// </summary>
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public class VPMatrixCache : IDisposable
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{
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public readonly struct Index
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{
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public static readonly Index INVALID = new Index(-1);
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internal readonly int index;
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public Index(int index)
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{
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this.index = index;
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}
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public bool IsValid()
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{
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return index >= 0;
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}
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}
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readonly List<Camera> cameras = new List<Camera>(2);
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public NativeList<Matrix4x4> VpMatrices { get; } = new NativeList<Matrix4x4>(2, Allocator.Persistent);
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/// <summary>
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/// Check if the Camera's VP matrix is cached
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/// </summary>
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/// <returns>The index of the camera if found; otherwise, -1.</returns>
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public Index IndexOf(Camera camera)
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{
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return new Index(cameras.IndexOf(camera));
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}
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/// <summary>
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/// Add to the cache. No duplicate check is done. Make sure to call IndexOf first
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/// </summary>
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/// <param name="camera">The camera to get the matrix is from</param>
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/// <returns>The index in the cache where the matrix is stored</returns>
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public Index Add(Camera camera)
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{
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var matrix = camera.projectionMatrix * camera.worldToCameraMatrix;
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return Add(camera, matrix);
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}
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/// <summary>
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/// Add to the cache. No duplicate check is done. Make sure to call IndexOf first
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/// </summary>
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/// <param name="camera">The camera from which the matrix is from</param>
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/// <param name="vpMatrix">camera.projectionMatrix * camera.worldToCameraMatrix</param>
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/// <returns>The index in the cache where the matrix is stored</returns>
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public Index Add(Camera camera, Matrix4x4 vpMatrix)
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{
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var index = cameras.Count;
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cameras.Add(camera);
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VpMatrices.Add(vpMatrix);
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return new Index(index);
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}
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public void Clear()
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{
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cameras.Clear();
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VpMatrices.Clear();
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}
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public void Dispose()
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{
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VpMatrices.Dispose();
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}
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}
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}
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