Add the 'Line' light archetype and fix the scene

Assets/ScriptableRenderLoop/AdditionalLightData.cs

 namespace UnityEngine.Experimental.ScriptableRenderLoop
 {
-    //@TODO: We should continously move these values
+    public enum LightArchetype {Punctual, Rectangle, Line};
+
+    //@TODO: We should continuously move these values
+
         public const int DefaultShadowResolution = 512;
 
         public int shadowResolution = DefaultShadowResolution;
         public bool affectDiffuse = true;
         public bool affectSpecular = true;
 
-        // Area Light Hack
-        public bool treatAsAreaLight = false;
-        public bool isDoubleSided    = false;
+        public LightArchetype archetype = LightArchetype.Punctual;
+        public bool isDoubleSided = false;
 
         [RangeAttribute(0.0f, 20.0f)]
         public float areaLightLength = 0.0f;

Assets/ScriptableRenderLoop/HDRenderLoop/HDRenderLoop.cs

                 // Note: LightType.Area is offline only, use for baking, no need to test it
                 var lightData = new LightData();
 
-                // Early out if we reach the maximum
-                if (additionalData.treatAsAreaLight)
+                if (additionalData.archetype != LightArchetype.Punctual)
+                    // Early out if we reach the maximum
-                    lightData.lightType = GPULightType.Rectangle;
+                    if (additionalData.archetype == LightArchetype.Rectangle)
+                    {
+                        lightData.lightType = GPULightType.Rectangle;
+                    }
+                    else
+                    {
+                        lightData.lightType = GPULightType.Line;
+                    }
                 }
                 else
                 {
                 lightData.size = new Vector2(additionalData.areaLightLength, additionalData.areaLightWidth);
                 lightData.twoSided = additionalData.isDoubleSided;
 
-                if (additionalData.treatAsAreaLight)
+                if (additionalData.archetype == LightArchetype.Punctual)
-                    lightList.areaLights.Add(lightData);
+                    lightList.punctualLights.Add(lightData);
-                    lightList.punctualLights.Add(lightData);
+                    // Area and line lights are both currently stored as area lights on the GPU.
+                    lightList.areaLights.Add(lightData);
                 }
             }
 

Assets/TestScenes/HDTest/HDRenderLoopTest.unity

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   isDoubleSided: 0
   areaLightLength: 0
   areaLightWidth: 0
   shadowDimmer: 1
   affectDiffuse: 1
   affectSpecular: 1
-  treatAsAreaLight: 0
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   areaLightLength: 0
   areaLightWidth: 0
   shadowDimmer: 1
   affectDiffuse: 1
   affectSpecular: 1
-  treatAsAreaLight: 0
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   areaLightWidth: 0
   shadowDimmer: 1
   affectDiffuse: 1
   affectSpecular: 1
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   areaLightLength: 0
   areaLightWidth: 0
   shadowDimmer: 1
   affectDiffuse: 1
   affectSpecular: 1
-  treatAsAreaLight: 1
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   areaLightLength: 16
   areaLightWidth: 2
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