117 lines
4.2 KiB
C#
117 lines
4.2 KiB
C#
/*
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* Copyright 2022 Peter Han
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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* and associated documentation files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or
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* substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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using PeterHan.PLib.Core;
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using PeterHan.PLib.Detours;
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using System;
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using System.Collections.Generic;
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using BrightnessDict = System.Collections.Generic.IDictionary<int, float>;
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using Octant = DiscreteShadowCaster.Octant;
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namespace PeterHan.PLib.Lighting {
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/// <summary>
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/// A builder class which creates default light patterns based on octants.
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/// </summary>
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public sealed class OctantBuilder {
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/// <summary>
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/// The delegate type called to run the default DiscreteShadowCaster.ScanOctant.
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/// </summary>
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private delegate void ScanOctantFunc(Vector2I cellPos, int range, int depth,
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Octant octant, double startSlope, double endSlope, List<int> visiblePoints);
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/// <summary>
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/// The method to call to scan octants.
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/// </summary>
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private static readonly ScanOctantFunc OCTANT_SCAN;
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static OctantBuilder() {
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// Cache the method for faster execution
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OCTANT_SCAN = typeof(DiscreteShadowCaster).Detour<ScanOctantFunc>("ScanOctant");
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if (OCTANT_SCAN == null)
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PLightManager.LogLightingWarning("OctantBuilder cannot find default octant scanner!");
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}
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/// <summary>
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/// The fallout to use when building the light.
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/// </summary>
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public float Falloff { get; set; }
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/// <summary>
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/// If false, uses the default game smoothing. If true, uses better smoothing.
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/// </summary>
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public bool SmoothLight { get; set; }
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/// <summary>
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/// The origin cell.
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/// </summary>
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public int SourceCell { get; }
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/// <summary>
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/// The location where light cells are added.
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/// </summary>
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private readonly BrightnessDict destination;
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/// <summary>
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/// Creates a new octant builder.
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/// </summary>
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/// <param name="destination">The location where the lit cells will be placed.</param>
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/// <param name="sourceCell">The origin cell of the light.</param>
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public OctantBuilder(BrightnessDict destination, int sourceCell) {
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if (!Grid.IsValidCell(sourceCell))
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throw new ArgumentOutOfRangeException(nameof(sourceCell));
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this.destination = destination ?? throw new ArgumentNullException(nameof(
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destination));
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destination[sourceCell] = 1.0f;
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Falloff = 0.5f;
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// Use the default game's light algorithm
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SmoothLight = false;
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SourceCell = sourceCell;
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}
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/// <summary>
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/// Adds an octant of light.
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/// </summary>
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/// <param name="range">The range of the light.</param>
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/// <param name="octant">The octant to scan.</param>
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/// <returns>This object, for call chaining.</returns>
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public OctantBuilder AddOctant(int range, Octant octant) {
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var points = ListPool<int, OctantBuilder>.Allocate();
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OCTANT_SCAN?.Invoke(Grid.CellToXY(SourceCell), range, 1, octant, 1.0, 0.0, points);
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// Transfer to our array using:
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foreach (int cell in points) {
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float intensity;
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if (SmoothLight)
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// Better, not rounded falloff
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intensity = PLightManager.GetSmoothFalloff(Falloff, cell, SourceCell);
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else
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// Default falloff
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intensity = PLightManager.GetDefaultFalloff(Falloff, cell, SourceCell);
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destination[cell] = intensity;
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}
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points.Recycle();
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return this;
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}
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public override string ToString() {
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return string.Format("OctantBuilder[Cell {0:D}, {1:D} lit]", SourceCell,
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destination.Count);
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}
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}
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}
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