HDRenderLoop: Make cubemap code compile

- miss preDFG texture
- do not work currently
- Add bunch of sphere metal/dieletric from smoothness 0..1

Assets/ScriptableRenderLoop/HDRenderLoop/HDRenderLoop.asset.meta

 fileFormatVersion: 2
 guid: 2400b74f5ce370c4481e5dc417d03703
-timeCreated: 1475845998
+timeCreated: 1476466770
 licenseType: Pro
 NativeFormatImporter:
   userData: 

Assets/ScriptableRenderLoop/HDRenderLoop/HDRenderLoop.cs

             m_DeferredMaterial.SetMatrix("_InvViewProjMatrix", invViewProj);
 
             Vector4 screenSize = ComputeScreenSize(camera);
-            m_DeferredMaterial.SetVector("_ScreenSize", screenSize);
-
-            m_DeferredMaterial.SetTexture("_EnvTextures", m_cubeReflTexArray.GetTexCache());
+            m_DeferredMaterial.SetVector("_ScreenSize", screenSize);            
 
             // gbufferManager.BindBuffers(m_DeferredMaterial);
             // TODO: Bind depth textures
 
         void UpdatePunctualLights(VisibleLight[] visibleLights)
         {
-            int punctualLightCount = 0;
             List<PunctualLightData> lights = new List<PunctualLightData>();
 
             for (int lightIndex = 0; lightIndex < Math.Min(visibleLights.Length, MaxLights); lightIndex++)
                     }
 
                     lights.Add(l);
-                    punctualLightCount++;
-            Shader.SetGlobalInt("_PunctualLightCount", punctualLightCount);
+            Shader.SetGlobalInt("_PunctualLightCount", lights.Count);
+            Shader.SetGlobalTexture("_EnvTextures", m_cubeReflTexArray.GetTexCache());
-            int envLightCount = 0;
-                EnvLightData l = new EnvLightData();
-                /*
-                bool boxProj = EnvShapeType.None;
-                    (rl.boxProjection != 0);
+                if (probe.texture == null)
+                    continue;
-                l.positionWS = 
-                if (rl.boxProjection)
-                l.positionWS = probe.localToWorld;
-                l.shapeType;
+                EnvLightData l = new EnvLightData();
-                l.worldToLocal;
+                l.positionWS = probe.localToWorld.GetColumn(3);
+                l.shapeType = EnvShapeType.None;
+                if (probe.boxProjection != 0)
+                {
+                    l.shapeType = EnvShapeType.Box;
+                }
-                l.innerDistance;
-                l.sliceIndex;
-
-                l.capturePointWS;
-                l.blendDistance;
-                */
-                /*
-                Vector3 boxOffset = rl.center;                  // reflection volume offset relative to cube map capture point
-                float blendDistance = rl.blendDistance;
-
-                Matrix4x4 mat = rl.localToWorld;
-                //Matrix4x4 mat = rl.transform.localToWorldMatrix;
-                Vector3 cubeCapturePos = mat.GetColumn(3);      // cube map capture position in world space
-                Vector3 combinedExtent = e + new Vector3(blendDistance, blendDistance, blendDistance);
+                // Caution should only be rigid transform, no scale
+                l.worldToLocal = probe.localToWorld.transpose;
+                l.innerDistance = probe.bounds.extents;
-                lightData[i].uLightType = (uint)LightDefinitions.BOX_LIGHT;
+                l.sliceIndex = m_cubeReflTexArray.FetchSlice(probe.texture);
-                m_cubeReflTexArray.FetchSlice(cubemap);
-
-                if (boxProj) lightData[i].flags |= LightDefinitions.IS_BOX_PROJECTED;
-                */
+                // center is local capture point. By multiply by localToWorld we get world position
+                l.capturePointWS = probe.localToWorld.MultiplyPoint(probe.center);
+                l.blendDistance = probe.blendDistance;
-                envLightCount++;
-            Shader.SetGlobalInt("_EnvLightCount", envLightCount);
+            Shader.SetGlobalInt("_EnvLightCount", lights.Count);
         }
 
         public override void Render(Camera[] cameras, RenderLoop renderLoop)

Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/LightDefinition.cs

 
         public Vector3 capturePointWS;
         public float blendDistance;
-
-        /*
-        volumeWorldToLocal
-        shapeType - ENV_BOX_PROJECTED
-        innerDistance -   vBoxInnerDist
-        blendDistance - fProbeBlendDistance
-        capturePointWS - vLocalCubeCapturePoint  // Caution, not the same space local vs world
-        sliceIndex
-        light.positionWS
-        sphereRadius (i.e innerDistance.x)
-        */
-
     };
 
     [GenerateHLSL]

Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Lighting/Lighting.hlsl

 #define UNITY_DECLARE_ENV(tex) UNITY_DECLARE_TEXCUBEARRAY(tex)
 #define UNITY_ARGS_ENV(tex) UNITY_ARGS_TEXCUBEARRAY(tex)
 #define UNITY_PASS_ENV(tex) UNITY_PASS_TEXCUBEARRAY(tex)
-#define UNITY_SAMPLE_ENV_LOD(tex,coord,lod) UNITY_SAMPLE_TEXCUBEARRAY_LOD(tex,coord,lod)
+#define UNITY_SAMPLE_ENV_LOD(tex, coord, lightData, lod) UNITY_SAMPLE_TEXCUBEARRAY_LOD(tex, float4(coord, lightData.sliceIndex), lod)
 
 #include "Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Material/Material.hlsl"
 

Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Lighting/LightingForward.hlsl

     }
     */
 
+    float4 iblDiffuseLighting = float4(0.0, 0.0, 0.0, 0.0);
+    float4 iblSpecularLighting = float4(0.0, 0.0, 0.0, 0.0);
+
-        diffuseLighting += localDiffuseLighting;
-        specularLighting += localSpecularLighting;
+        iblDiffuseLighting.rgb = lerp(iblDiffuseLighting.rgb, localDiffuseLighting.rgb, localDiffuseLighting.a); // Should be remove by the compiler if it is smart as all is constant 0
+        iblSpecularLighting.rgb = lerp(iblSpecularLighting.rgb, localSpecularLighting.rgb, localSpecularLighting.a);
+
+    diffuseLighting += iblDiffuseLighting;
+    specularLighting += iblSpecularLighting;
 }
 
 #endif // UNITY_LIGHTING_FORWARD_INCLUDED

Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Material/Lit.hlsl

     }
 }
 
-// TODO: We need to change this hard limit!
-#define UNITY_SPECCUBE_LOD_STEPS (6)
-
-float perceptualRoughnessToMipmapLevel(float perceptualRoughness)
-{
-    // TODO: Clean a bit this code
-    // CAUTION: remap from Morten may work only with offline convolution, see impact with runtime convolution!
-
-    // For now disabled
-#if 0
-    float m = PerceptualRoughnessToRoughness(perceptualRoughness); // m is the real roughness parameter
-    const float fEps = 1.192092896e-07F;        // smallest such that 1.0+FLT_EPSILON != 1.0  (+1e-4h is NOT good here. is visibly very wrong)
-    float n = (2.0 / max(fEps, m*m)) - 2.0;		// remap to spec power. See eq. 21 in --> https://dl.dropboxusercontent.com/u/55891920/papers/mm_brdf.pdf
-
-    n /= 4;									    // remap from n_dot_h formulatino to n_dot_r. See section "Pre-convolved Cube Maps vs Path Tracers" --> https://s3.amazonaws.com/docs.knaldtech.com/knald/1.0.0/lys_power_drops.html
-
-    perceptualRoughness = pow(2 / (n + 2), 0.25);		// remap back to square root of real roughness (0.25 include both the sqrt root of the conversion and sqrt for going from roughness to perceptualRoughness)
-#else
-    // MM: came up with a surprisingly close approximation to what the #if 0'ed out code above does.
-    perceptualRoughness = perceptualRoughness*(1.7 - 0.7*perceptualRoughness);
-#endif
-
-    return perceptualRoughness * UNITY_SPECCUBE_LOD_STEPS;
-}
-
 // _preIntegratedFG and _CubemapLD are unique for each BRDF
 void EvaluateBSDF_Env(  float3 V, float3 positionWS, PreLightData prelightData, EnvLightData lightData, BSDFData bsdfData,
                         UNITY_ARGS_ENV(_EnvTextures),
+    // TODO: factor this code in common, so other material authoring don't require to rewrite everything, 
+    // also think about how such a loop can handle 2 cubemap at the same time as old unity. Macro can allow to do that
+    // but we need to have UNITY_SAMPLE_ENV_LOD replace by a true function instead that is define by the lighting arcitecture.
+    // Also not sure how to deal with 2 intersection....
+    // Box and sphere are related to light property (but we have also distance based roughness etc...)
+
     // TODO: test the strech from Tomasz
     // float shrinkedRoughness = AnisotropicStrechAtGrazingAngle(bsdfData.roughness, bsdfData.perceptualRoughness, NdotV);
     
 
         float distFade = length(positionWS - lightData.positionWS);
         weight = saturate(((sphereRadius + lightData.blendDistance) - distFade) / max(lightData.blendDistance, 0.0001)); // avoid divide by zero
+        
+        // Smooth weighting
+        weight = smoothstep01(weight);
-    float4 preLD = UNITY_SAMPLE_ENV_LOD(_EnvTextures, float4(R, lightData.sliceIndex), mip);
+    float4 preLD = UNITY_SAMPLE_ENV_LOD(_EnvTextures, R, lightData, mip);
     specularLighting.rgb = preLD.rgb * prelightData.specularDFG;
 
     // Apply specular occlusion on it
-    diffuseLighting = float4(0.0, 0.0, 0.0, 1.0);
+    diffuseLighting = float4(0.0, 0.0, 0.0, 0.0);
 }
 
 #endif // UNITY_MATERIAL_LIT_INCLUDED

Assets/ScriptableRenderLoop/ShaderLibrary/ImageBasedLighting.hlsl

     return float4(acc * (1.0 / accWeight), 1.0);
 }
 
+// TODO: We need to change this hard limit!
+#define UNITY_SPECCUBE_LOD_STEPS (6)
+
+float perceptualRoughnessToMipmapLevel(float perceptualRoughness)
+{
+    // TODO: Clean a bit this code
+    // CAUTION: remap from Morten may work only with offline convolution, see impact with runtime convolution!
+
+    // For now disabled
+#if 0
+    float m = PerceptualRoughnessToRoughness(perceptualRoughness); // m is the real roughness parameter
+    const float fEps = 1.192092896e-07F;        // smallest such that 1.0+FLT_EPSILON != 1.0  (+1e-4h is NOT good here. is visibly very wrong)
+    float n = (2.0 / max(fEps, m*m)) - 2.0;		// remap to spec power. See eq. 21 in --> https://dl.dropboxusercontent.com/u/55891920/papers/mm_brdf.pdf
+
+    n /= 4.0;									    // remap from n_dot_h formulatino to n_dot_r. See section "Pre-convolved Cube Maps vs Path Tracers" --> https://s3.amazonaws.com/docs.knaldtech.com/knald/1.0.0/lys_power_drops.html
+
+    perceptualRoughness = pow(2.0 / (n + 2.0), 0.25);		// remap back to square root of real roughness (0.25 include both the sqrt root of the conversion and sqrt for going from roughness to perceptualRoughness)
+#else
+    // MM: came up with a surprisingly close approximation to what the #if 0'ed out code above does.
+    perceptualRoughness = perceptualRoughness * (1.7 - 0.7 * perceptualRoughness);
+#endif
+
+    return perceptualRoughness * UNITY_SPECCUBE_LOD_STEPS;
+}
+
 // Ref: See "Moving Frostbite to PBR" Listing 22
 // This formulation is for GGX only (with smith joint visibility or regular)
 float3 GetSpecularDominantDir(float3 N, float3 R, float roughness)
     return lerp(N, R, lerpFactor);
 }
 
-//-------------------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Anisotropic image based lighting
+//-----------------------------------------------------------------------------
 // To simulate the streching of highlight at grazing angle for IBL we shrink the roughness
 // which allow to fake an anisotropic specular lobe.
 // Ref: http://www.frostbite.com/2015/08/stochastic-screen-space-reflections/ - slide 84

Assets/TestScenes/HDTest/HDRenderLoopTest.unity

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+      second: {r: 0.7176471, g: 0.7176471, b: 0.7176471, a: 1}
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+        name: _EmissiveColor
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