66 lines
2.5 KiB
C#
66 lines
2.5 KiB
C#
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using Unity.Burst;
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using Unity.Collections;
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using Unity.Jobs;
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using Unity.Mathematics;
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namespace UnityEngine.Rendering.Universal
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{
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struct LightMinMaxZ
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{
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public float minZ;
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public float maxZ;
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}
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[BurstCompile]
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struct MinMaxZJob : IJobFor
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{
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public float4x4 worldToViewMatrix;
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[ReadOnly]
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public NativeArray<VisibleLight> lights;
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public NativeArray<LightMinMaxZ> minMaxZs;
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public NativeArray<float> meanZs;
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public void Execute(int index)
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{
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var light = lights[index];
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var lightToWorld = (float4x4)light.localToWorldMatrix;
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var originWS = lightToWorld.c3.xyz;
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var originVS = math.mul(worldToViewMatrix, math.float4(originWS, 1)).xyz;
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originVS.z *= -1;
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var minMax = new LightMinMaxZ
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{
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minZ = originVS.z - light.range,
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maxZ = originVS.z + light.range
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};
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if (light.lightType == LightType.Spot)
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{
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// Based on https://iquilezles.org/www/articles/diskbbox/diskbbox.htm
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var angleA = math.radians(light.spotAngle) * 0.5f;
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float cosAngleA = math.cos(angleA);
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float coneHeight = light.range * cosAngleA;
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float3 spotDirectionWS = lightToWorld.c2.xyz;
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var endPointWS = originWS + spotDirectionWS * coneHeight;
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var endPointVS = math.mul(worldToViewMatrix, math.float4(endPointWS, 1)).xyz;
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endPointVS.z *= -1;
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var angleB = math.PI * 0.5f - angleA;
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var coneRadius = light.range * cosAngleA * math.sin(angleA) / math.sin(angleB);
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var a = endPointVS - originVS;
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var e = math.sqrt(1.0f - a.z * a.z / math.dot(a, a));
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// `-a.z` and `a.z` is `dot(a, {0, 0, -1}).z` and `dot(a, {0, 0, 1}).z` optimized
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// `cosAngleA` is multiplied by `coneHeight` to avoid normalizing `a`, which we know has length `coneHeight`
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if (-a.z < coneHeight * cosAngleA) minMax.minZ = math.min(originVS.z, endPointVS.z - e * coneRadius);
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if (a.z < coneHeight * cosAngleA) minMax.maxZ = math.max(originVS.z, endPointVS.z + e * coneRadius);
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}
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minMax.minZ = math.max(minMax.minZ, 0);
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minMax.maxZ = math.max(minMax.maxZ, 0);
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minMaxZs[index] = minMax;
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meanZs[index] = (minMax.minZ + minMax.maxZ) / 2.0f;
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}
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}
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}
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