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76 lines
2.3 KiB
76 lines
2.3 KiB
using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.Rendering;
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using UnityEngine.UI;
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namespace LeTai.TrueShadow
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{
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public partial class ShadowRenderer
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{
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// TODO: cleanup unused mask materials
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static readonly Dictionary<(bool, Material), Material> MASK_MATERIALS_CACHE =
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new Dictionary<(bool, Material), Material>();
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internal static void ClearMaskMaterialCache()
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{
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foreach (var keyValuePair in MASK_MATERIALS_CACHE)
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{
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if(Application.isPlaying)
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Destroy(keyValuePair.Value);
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else
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DestroyImmediate(keyValuePair.Value);
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}
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MASK_MATERIALS_CACHE.Clear();
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}
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public Material GetModifiedMaterial(Material baseMaterial)
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{
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if (!shadow)
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return baseMaterial;
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shadow.ModifyShadowRendererMaterial(baseMaterial);
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if (!baseMaterial.HasProperty(ShaderId.COLOR_MASK) ||
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!baseMaterial.HasProperty(ShaderId.STENCIL_OP))
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return baseMaterial;
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bool casterIsMask = shadow.GetComponent<Mask>() != null;
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MASK_MATERIALS_CACHE.TryGetValue((casterIsMask, baseMaterial), out var mat);
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if (!mat)
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{
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mat = new Material(baseMaterial);
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if (shadow.ShadowAsSibling)
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{
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// Prevent shadow from writing to stencil mask
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mat.SetInt(ShaderId.COLOR_MASK, (int) ColorWriteMask.All);
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mat.SetInt(ShaderId.STENCIL_OP, (int) StencilOp.Keep);
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}
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else if (casterIsMask)
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{
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// Escape mask if we have one
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var baseStencilId = mat.GetInt(ShaderId.STENCIL_ID) + 1;
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int stencilDepth = 0;
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for (; stencilDepth < 8; stencilDepth++)
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{
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if (((baseStencilId >> stencilDepth) & 1) == 1)
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break;
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}
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stencilDepth = Mathf.Max(0, stencilDepth - 1);
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var stencilId = (1 << stencilDepth) - 1;
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mat.SetInt(ShaderId.STENCIL_ID, stencilId);
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mat.SetInt(ShaderId.STENCIL_READ_MASK, stencilId);
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}
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MASK_MATERIALS_CACHE[(casterIsMask, baseMaterial)] = mat;
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}
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return mat;
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}
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}
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}
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