Leonid Pershin
96e19c7c61
DayNight.SunShadow returns a cell offset opposite the sun's east-west position, longest near sunrise/sunset (low sun) and zero at noon/night, tilted slightly south so shadows fall in front of occluders. LightmapBuilder gains a directional shadow pass (MaxShadowCells length cap, SunShadowStrength darkening); LightmapSystem feeds it the current sun shadow each rebuild. Tests cover SunShadow's day-arc behaviour and the builder's directional darkening.
94 lines
2.8 KiB
C#
94 lines
2.8 KiB
C#
using Microsoft.Xna.Framework;
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using MrGameEng.Lighting;
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using Xunit;
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namespace MrGameEng.Lighting.Tests;
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public class LightmapBuilderTests
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{
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private static float[] Build(
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int width,
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int height,
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float ambient,
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bool[] occluders,
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params LightSample[] lights
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)
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{
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var light = new float[width * height];
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LightmapBuilder.Build(light, width, height, ambient, occluders, lights);
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return light;
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}
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[Fact]
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public void Ambient_WithoutOccluders_IsUniform()
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{
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var light = Build(4, 4, 0.6f, new bool[16]);
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Assert.All(light, v => Assert.Equal(0.6f, v, 5));
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}
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[Fact]
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public void OccluderCell_IsDarkerThanOpenCell()
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{
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var occ = new bool[9];
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occ[4] = true; // centre cell shaded
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var light = Build(3, 3, 0.8f, occ);
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Assert.True(light[4] < light[0]);
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Assert.Equal(0.8f * LightmapBuilder.OccluderShade, light[4], 5);
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}
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[Fact]
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public void PointLight_IsBrighterNearSourceAndFadesToRadius()
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{
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var light = Build(7, 1, 0f, new bool[7], new LightSample(0, 0, 6f, 1f));
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Assert.True(light[0] > light[2] && light[2] > light[5]);
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Assert.InRange(light[6], 0f, 0.01f); // на радиусе свет угасает
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}
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[Fact]
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public void Occluder_CastsShadowBehindIt()
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{
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var occ = new bool[7];
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occ[3] = true; // препятствие между источником (0) и дальними клетками
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var light = Build(7, 1, 0f, occ, new LightSample(0, 0, 10f, 1f));
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Assert.True(light[1] > 0f); // перед препятствием — освещено
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Assert.Equal(0f, light[5], 5); // за препятствием — тень
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}
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[Fact]
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public void SunShadow_DarkensCellsInTheShadowDirection_FadingFromTheCaster()
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{
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var occ = new bool[7];
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occ[3] = true; // occluder in the middle
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var light = new float[7];
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LightmapBuilder.Build(
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light,
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7,
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1,
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1f,
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occ,
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[],
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sunShadow: new Vector2(3f, 0f),
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sunShadowStrength: 0.6f
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);
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Assert.Equal(1f, light[2], 5); // toward the sun (opposite the shadow) — unshadowed
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Assert.Equal(LightmapBuilder.OccluderShade, light[3], 5); // occluder cell stays self-shaded
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Assert.True(light[4] < 1f); // in shadow
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Assert.True(light[4] < light[6]); // darker near the caster, fading along the shadow
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}
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[Fact]
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public void Values_StayWithinUnitRange()
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{
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var light = Build(
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5,
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5,
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0.5f,
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new bool[25],
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new LightSample(2, 2, 4f, 2f) // яркий свет — проверяем клампинг
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);
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Assert.All(light, v => Assert.InRange(v, 0f, 1f));
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}
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}
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