- Properly integrated fog for transparent Lit/Unlit materials.

- Added density parameter for exp fog
7 年前 · 30bdceed
--- a/SampleScenes/HDTest/SkyFogTest.unity
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+  m_Layer: 0
+  m_Name: Unlit_Transparent
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!4 &2031183051
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+  m_PrefabInternal: {fileID: 0}
+  m_GameObject: {fileID: 2031183050}
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
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+  m_LocalScale: {x: 1, y: 1, z: 1}
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+  m_RootOrder: 16
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
--- a/SampleScenes/HDTest/SkyFogTest/SkyFogProceduralSky.asset
+++ b/SampleScenes/HDTest/SkyFogTest/SkyFogProceduralSky.asset
  updatePeriod: 0
  lightingOverride: {fileID: 0}
  atmosphericScatteringSettings:
-    type: 2
+    type: 1
-    mipFogMaxMip: 0.554
+    mipFogMaxMip: 0.514
-    linearFogEnd: 100
-    expFogDistance: 100
+    linearFogEnd: 50
+    expFogDistance: 150
+    expFogDensity: 1
-  groundColor: {r: 0.5661765, g: 0.5661765, b: 0.5661765, a: 1}
+  groundColor: {r: 0.5808823, g: 0.5808823, b: 0.5808823, a: 1}
  enableSunDisk: 1
--- a/ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePass.hlsl
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePass.hlsl
 #include "TilePass.cs.hlsl"
+#include "../../Sky/SkyVariables.hlsl"

 StructuredBuffer<uint> g_vLightListGlobal;      // don't support Buffer yet in unity

 // Use texture array for reflection (or LatLong 2D array for mobile)
 TEXTURECUBE_ARRAY_ABSTRACT(_EnvTextures);
 SAMPLERCUBE_ABSTRACT(sampler_EnvTextures);
-
-TEXTURECUBE(_SkyTexture);
-SAMPLERCUBE(sampler_SkyTexture); // NOTE: Sampler could be share here with _EnvTextures. Don't know if the shader compiler will complain...
-float _SkyTextureMipCount;

 TEXTURE2D(_AmbientOcclusionTexture);

    }
    else // SINGLE_PASS_SAMPLE_SKY
    {
-        return SAMPLE_TEXTURECUBE_LOD(_SkyTexture, sampler_SkyTexture, texCoord, lod);
+        return SampleSkyTexture(texCoord, lod);
    }
 }
--- a/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader
        [HideInInspector] _CullMode("__cullmode", Float) = 2.0
        [HideInInspector] _ZTestMode("_ZTestMode", Int) = 8

+        [ToggleOff] _EnableFog ("Enable Fog", Float) = 1.0
+
        [ToggleOff] _DoubleSidedEnable("Double sided enable", Float) = 0.0
        [Enum(None, 0, Mirror, 1, Flip, 2)] _DoubleSidedNormalMode("Double sided normal mode", Float) = 1
        [HideInInspector] _DoubleSidedConstants("_DoubleSidedConstants", Vector) = (1, 1, -1, 0)

    #pragma target 4.5
    #pragma only_renderers d3d11 ps4 metal // TEMP: until we go futher in dev
-    // #pragma enable_d3d11_debug_symbols
+    //#pragma enable_d3d11_debug_symbols

    //-------------------------------------------------------------------------------------
    // Variant
    #pragma shader_feature _SPECULARCOLORMAP

    #pragma shader_feature _ _BLENDMODE_LERP _BLENDMODE_ADD _BLENDMODE_SOFT_ADD _BLENDMODE_MULTIPLY _BLENDMODE_PRE_MULTIPLY
+    
+    // This feature is only for transparent Lit
+    #pragma shader_feature _ENABLE_FOG

    // MaterialId are used as shader feature to allow compiler to optimize properly
    // Note _MATID_STANDARD is not define as there is always the default case "_". We assign default as _MATID_STANDARD, so we never test _MATID_STANDARD
--- a/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader
        [HideInInspector] _CullMode("__cullmode", Float) = 2.0
        [HideInInspector] _ZTestMode("_ZTestMode", Int) = 8

+        [ToggleOff] _EnableFog ("Enable Fog", Float) = 1.0
+
        [ToggleOff] _DoubleSidedEnable("Double sided enable", Float) = 0.0
        [Enum(None, 0, Mirror, 1, Flip, 2)] _DoubleSidedNormalMode("Double sided normal mode", Float) = 1
        [HideInInspector] _DoubleSidedConstants("_DoubleSidedConstants", Vector) = (1, 1, -1, 0)
    #pragma shader_feature _SPECULARCOLORMAP

    #pragma shader_feature _ _BLENDMODE_LERP _BLENDMODE_ADD _BLENDMODE_SOFT_ADD _BLENDMODE_MULTIPLY _BLENDMODE_PRE_MULTIPLY
+
+    // This feature is only for transparent Lit
+    #pragma shader_feature _ENABLE_FOG

    // MaterialId are used as shader feature to allow compiler to optimize properly
    // Note _MATID_STANDARD is not define as there is always the default case "_". We assign default as _MATID_STANDARD, so we never test _MATID_STANDARD
--- a/ScriptableRenderPipeline/HDRenderPipeline/Material/Material.hlsl
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Material/Material.hlsl
 #include "../../Core/ShaderLibrary/CommonMaterial.hlsl"
 #include "../../Core/ShaderLibrary/EntityLighting.hlsl"
 #include "../../Core/ShaderLibrary/ImageBasedLighting.hlsl"
+#include "../Sky/AtmosphericScattering/AtmosphericScattering.hlsl"

 //-----------------------------------------------------------------------------
 // Blending
 #else
 #   define SURFACE_TYPE_OPAQUE
 #endif
+
+//-----------------------------------------------------------------------------
+// Fog sampling function for materials
+//-----------------------------------------------------------------------------
+
+// Used for transparent object. input color is color + alpha of the original transparent pixel.
+float4 EvaluateAtmosphericScattering(PositionInputs posInput, float4 inputColor)
+{
+    float4 result = inputColor;
+
+#if defined(SURFACE_TYPE_TRANSPARENT) && defined(_ENABLE_FOG)
+    float4 fog = EvaluateAtmosphericScattering(posInput);
+
+#if defined(_BLENDMODE_LERP)
+    // Regular alpha blend only need a lerp to work
+    result.rgb = lerp(result.rgb, fog.rgb, fog.a);
+#elif defined(_BLENDMODE_ADD)
+    // For additive, we just need to fade to black with fog density (black + background == background color == fog color)
+    result.rgb = result.rgb * (1.0 - fog.a);
+#elif defined(_BLENDMODE_MULTIPLY) 
+    // For multiplicative, we just need to fade to white with fog density (white * background == background color == fog color)
+    result.rgb = lerp(result.rgb, float3(1.0, 1.0, 1.0), fog.a);
+#elif defined(_BLENDMODE_PRE_MULTIPLY)
+    // For Pre-Multiplied Alpha Blend, we need to multiply fog color by src alpha to match regular alpha blending formula.
+    result.rgb = lerp(result.rgb, fog.rgb * result.a, fog.a);
+#endif
+
+#else
+    // Evaluation of fog for opaque objects is currently done in a full screen pass independent from any material parameters.
+    // but this funtction is called in generic forward shader code so we need it to be neutral in this case.
+#endif
+
+    return result;
+}
+

 //-----------------------------------------------------------------------------
 // BuiltinData
--- a/ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/Editor/BaseUnlitUI.cs
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/Editor/BaseUnlitUI.cs
            public static GUIContent alphaCutoffShadowText = new GUIContent("Alpha Cutoff Shadow", "Threshold for alpha cutoff in case of shadow pass");
            public static GUIContent alphaCutoffPrepassText = new GUIContent("Alpha Cutoff Prepass", "Threshold for alpha cutoff in case of depth prepass");
            public static GUIContent transparentDepthPrepassEnableText = new GUIContent("Enable transparent depth prepass", "It allow to ");	
+            public static GUIContent enableFogText = new GUIContent("Enable Fog");

            public static GUIContent doubleSidedEnableText = new GUIContent("Double Sided", "This will render the two face of the objects (disable backface culling) and flip/mirror normal");
            public static GUIContent distortionEnableText = new GUIContent("Distortion", "Enable distortion on this shader");
        protected const string kDistortionOnly = "_DistortionOnly";
        protected MaterialProperty distortionDepthTest = null;
        protected const string kDistortionDepthTest = "_DistortionDepthTest";
+        protected MaterialProperty enableFog = null;
+        protected const string kEnableFog = "_EnableFog";

        // See comment in LitProperties.hlsl
        const string kEmissionColor = "_EmissionColor";
            distortionEnable = FindProperty(kDistortionEnable, props, false);
            distortionOnly = FindProperty(kDistortionOnly, props, false);
            distortionDepthTest = FindProperty(kDistortionDepthTest, props, false);
+
+            enableFog = FindProperty(kEnableFog, props, false);
        }

        void SurfaceTypePopup()
            {
                BlendModePopup();

+                if(enableFog != null)
+                    m_MaterialEditor.ShaderProperty(enableFog, StylesBaseUnlit.enableFogText);
+
                if (distortionEnable != null)
                {
                    m_MaterialEditor.ShaderProperty(distortionEnable, StylesBaseUnlit.distortionEnableText);

            SetKeyword(material, "_DOUBLESIDED_ON", doubleSidedEnable);
            SetKeyword(material, "_ALPHATEST_ON", alphaTestEnable);
+
+            bool fogEnabled = material.GetFloat(kEnableFog) > 0.0f;
+            SetKeyword(material, "_ENABLE_FOG", fogEnabled);

            if (material.HasProperty(kDistortionEnable))
            {                
--- a/ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/ShaderPass/UnlitSharePass.hlsl
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/ShaderPass/UnlitSharePass.hlsl

 #define ATTRIBUTES_NEED_TEXCOORD0

+#if defined(_ENABLE_FOG)
+#define VARYINGS_NEED_POSITION_WS
+#endif
+
 #define VARYINGS_NEED_TEXCOORD0

 // This include will define the various Attributes/Varyings structure
--- a/ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/Unlit.shader
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/Unlit.shader

        [ToggleOff] _DoubleSidedEnable("Double sided enable", Float) = 0.0

+        [ToggleOff] _EnableFog ("Enable Fog", Float) = 0.0
+
        // Caution: C# code in BaseLitUI.cs call LightmapEmissionFlagsProperty() which assume that there is an existing "_EmissionColor"
        // value that exist to identify if the GI emission need to be enabled.
        // In our case we don't use such a mechanism but need to keep the code quiet. We declare the value and always enable it.

    #pragma target 4.5
    #pragma only_renderers d3d11 ps4 metal  // TEMP: until we go further in dev
-    // #pragma enable_d3d11_debug_symbols
+    //#pragma enable_d3d11_debug_symbols

    //-------------------------------------------------------------------------------------
    // Variant
    #pragma shader_feature _EMISSIVE_COLOR_MAP

    #pragma shader_feature _ _BLENDMODE_LERP _BLENDMODE_ADD _BLENDMODE_SOFT_ADD _BLENDMODE_MULTIPLY _BLENDMODE_PRE_MULTIPLY
+
+    // This feature is only for transparent Unlit
+    #pragma shader_feature _ENABLE_FOG

    //-------------------------------------------------------------------------------------
    // Define
--- a/ScriptableRenderPipeline/HDRenderPipeline/ShaderPass/ShaderPassForward.hlsl
+++ b/ScriptableRenderPipeline/HDRenderPipeline/ShaderPass/ShaderPassForward.hlsl
    float3 bakeDiffuseLighting = GetBakedDiffuseLigthing(surfaceData, builtinData, bsdfData, preLightData);
    LightLoop(V, posInput, preLightData, bsdfData, bakeDiffuseLighting, featureFlags, diffuseLighting, specularLighting);

-    outColor = float4(diffuseLighting + specularLighting, builtinData.opacity);
+    outColor = EvaluateAtmosphericScattering(posInput, float4(diffuseLighting + specularLighting, builtinData.opacity));
    }

 #ifdef _DEPTHOFFSET_ON
--- a/ScriptableRenderPipeline/HDRenderPipeline/ShaderPass/ShaderPassForwardUnlit.hlsl
+++ b/ScriptableRenderPipeline/HDRenderPipeline/ShaderPass/ShaderPassForwardUnlit.hlsl
    BSDFData bsdfData = ConvertSurfaceDataToBSDFData(surfaceData);

    // TODO: we must not access bsdfData here, it break the genericity of the code!
-    return float4(bsdfData.color + builtinData.emissiveColor, builtinData.opacity);
+    return EvaluateAtmosphericScattering(posInput, float4(bsdfData.color + builtinData.emissiveColor, builtinData.opacity));
 }
--- a/ScriptableRenderPipeline/HDRenderPipeline/Sky/AtmosphericScattering/AtmosphericScattering.cs
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Sky/AtmosphericScattering/AtmosphericScattering.cs
        // Exponential fog
        //[Min(0.0f)] Not available until 2018.1
        public float        expFogDistance = 100.0f;
+        [Range(0.0f, 1.0f)]
+        public float        expFogDensity = 1.0f;

        public bool NeedFogRendering()
        {
            // Linear Fog
            cmd.SetGlobalVector(m_LinearFogParam, new Vector4(linearFogStart, linearFogEnd, 1.0f / (linearFogEnd - linearFogStart), linearFogDensity));
            // Exp fog
-            cmd.SetGlobalVector(m_ExpFogParam, new Vector4(Mathf.Max(0.0f, expFogDistance), 0.0f, 0.0f, 0.0f));
+            cmd.SetGlobalVector(m_ExpFogParam, new Vector4(Mathf.Max(0.0f, expFogDistance), expFogDensity, 0.0f, 0.0f));
        }
    }

--- a/ScriptableRenderPipeline/HDRenderPipeline/Sky/AtmosphericScattering/AtmosphericScattering.hlsl
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Sky/AtmosphericScattering/AtmosphericScattering.hlsl
 #ifndef UNITY_ATMOSPHERIC_SCATTERING_INCLUDED
 #define UNITY_ATMOSPHERIC_SCATTERING_INCLUDED

+#include "../../../Core/ShaderLibrary/VolumeRendering.hlsl"
+
-#include "../../../Core/ShaderLibrary/VolumeRendering.hlsl"
+#include "../SkyVariables.hlsl"
+#include "../../ShaderVariables.hlsl"
+CBUFFER_START(AtmosphericScattering)
-
-float4  _MipFogParameters;
-#define _MipFogNear     _MipFogParameters.x
-#define _MipFogFar      _MipFogParameters.y
-#define _MipFogMaxMip   _MipFogParameters.z
+float4          _MipFogParameters;
+// Linear fog
+uniform float4  _LinearFogParameters;
+// Exp fog
+uniform float4  _ExpFogParameters;
+CBUFFER_END
-TEXTURECUBE(_SkyTexture); // Global name defined in SkyManager
-SAMPLERCUBE(sampler_SkyTexture);
-float _SkyTextureMipCount;
+#define _MipFogNear         _MipFogParameters.x
+#define _MipFogFar          _MipFogParameters.y
+#define _MipFogMaxMip       _MipFogParameters.z
-// Linear fog
-uniform float4 _LinearFogParameters;
-// Exp fog
-uniform float4 _ExpFogParameters;
-#define _ExpFogDensity      _ExpFogParameters.x
+#define _ExpFogDistance     _ExpFogParameters.x
+#define _ExpFogDensity      _ExpFogParameters.y

 float3 GetFogColor(PositionInputs posInput)
 {
    {
        // Based on Uncharted 4 "Mip Sky Fog" trick: http://advances.realtimerendering.com/other/2016/naughty_dog/NaughtyDog_TechArt_Final.pdf
        float mipLevel = (1.0 - _MipFogMaxMip * saturate((posInput.depthVS - _MipFogNear) / (_MipFogFar - _MipFogNear))) * _SkyTextureMipCount;
-        float3 dir = normalize(posInput.positionWS - _WorldSpaceCameraPos);
-        return SAMPLE_TEXTURECUBE_LOD(_SkyTexture, sampler_SkyTexture, dir, mipLevel).rgb;
+        float3 dir = normalize(posInput.positionWS - GetPrimaryCameraPosition());
+        return SampleSkyTexture(dir, mipLevel).rgb;
    }
    else // Should not be possible.
        return  float3(0.0, 0.0, 0.0);
    if (_AtmosphericScatteringType == FOGTYPE_EXPONENTIAL)
    {
        float3 fogColor = GetFogColor(posInput);
-        float fogFactor = 1.0f - Transmittance(OpticalDepthHomogeneous(1.0f / _ExpFogDensity, posInput.depthVS));
+        float fogFactor = _ExpFogDensity * (1.0f - Transmittance(OpticalDepthHomogeneous(1.0f / _ExpFogDistance, posInput.depthVS)));
        return float4(fogColor, fogFactor);
    }
    else if (_AtmosphericScatteringType == FOGTYPE_LINEAR)
--- a/ScriptableRenderPipeline/HDRenderPipeline/Sky/AtmosphericScattering/Editor/AtmosphericScatteringEditor.cs
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Sky/AtmosphericScattering/Editor/AtmosphericScatteringEditor.cs
            public readonly GUIContent linearFogDensity = new GUIContent("Fog Density");
            public readonly GUIContent linearFogStart = new GUIContent("Fog Start Distance");
            public readonly GUIContent linearFogEnd = new GUIContent("Fog End Distance");
+            public readonly GUIContent expFogDensity = new GUIContent("Fog Density");
            public readonly GUIContent expFogDistance = new GUIContent("Fog Distance");
        }

        private SerializedProperty m_LinearFogEnd;

        private SerializedProperty m_ExpFogDistance;
+        private SerializedProperty m_ExpFogDensity;

        public void OnEnable(SerializedProperty atmScatterProperty)
        {
            m_LinearFogEnd = atmScatterProperty.FindPropertyRelative("linearFogEnd");
            // Exp fog
            m_ExpFogDistance = atmScatterProperty.FindPropertyRelative("expFogDistance");
+            m_ExpFogDensity = atmScatterProperty.FindPropertyRelative("expFogDensity");
        }

        public void OnGUI()
                    }
                    else if((AtmosphericScatteringSettings.FogType)m_Type.intValue == AtmosphericScatteringSettings.FogType.Exponential)
                    {
+                        EditorGUILayout.PropertyField(m_ExpFogDensity, styles.expFogDensity);
                        EditorGUILayout.PropertyField(m_ExpFogDistance, styles.expFogDistance);
                    }
                }
--- a/SampleScenes/HDTest/Material/HDRenderLoopMaterials/Grid_Planar_Red.mat
+++ b/SampleScenes/HDTest/Material/HDRenderLoopMaterials/Grid_Planar_Red.mat
+%YAML 1.1
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--- a/SampleScenes/HDTest/Material/HDRenderLoopMaterials/Grid_Planar_Red.mat.meta
+++ b/SampleScenes/HDTest/Material/HDRenderLoopMaterials/Grid_Planar_Red.mat.meta
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+        m_Offset: {x: 0, y: 0}
+    m_Floats:
+    - _ATDistance: 1
+    - _AlbedoAffectEmissive: 0
+    - _AlphaCutoff: 0.5
+    - _AlphaCutoffEnable: 0
+    - _Anisotropy: 0
+    - _BlendMode: 4
+    - _CoatCoverage: 1
+    - _CoatIOR: 0.5
+    - _CullMode: 2
+    - _DepthOffsetEnable: 0
+    - _DetailAlbedoScale: 1
+    - _DetailNormalScale: 1
+    - _DetailSmoothnessScale: 1
+    - _DistortionDepthTest: 0
+    - _DistortionEnable: 0
+    - _DistortionOnly: 0
+    - _DoubleSidedEnable: 0
+    - _DoubleSidedNormalMode: 1
+    - _Drag: 1
+    - _DstBlend: 10
+    - _EmissiveColorMode: 1
+    - _EmissiveIntensity: 0
+    - _EnableFog: 1
+    - _EnablePerPixelDisplacement: 0
+    - _EnableSpecularOcclusion: 0
+    - _EnableVertexDisplacement: 0
+    - _EnableWind: 0
+    - _HeightAmplitude: 0.01
+    - _HeightCenter: 0.5
+    - _HeightMax: 1
+    - _HeightMin: -1
+    - _IOR: 1
+    - _InitialBend: 1
+    - _MaterialID: 1
+    - _Metallic: 0
+    - _NormalMapSpace: 0
+    - _NormalScale: 1
+    - _PPDLodThreshold: 5
+    - _PPDMaxSamples: 15
+    - _PPDMinSamples: 5
+    - _PerPixelDisplacementObjectScale: 1
+    - _RefractionMode: 0
+    - _ShiverDirectionality: 0.5
+    - _ShiverDrag: 0.2
+    - _Smoothness: 1
+    - _SmoothnessRemapMax: 1
+    - _SmoothnessRemapMin: 0
+    - _SrcBlend: 1
+    - _StencilRef: 2
+    - _Stiffness: 1
+    - _SubsurfaceProfile: 0
+    - _SubsurfaceRadius: 1
+    - _SurfaceType: 1
+    - _TexWorldScale: 1
+    - _Thickness: 1
+    - _ThicknessMultiplier: 1
+    - _UVBase: 0
+    - _UVDetail: 0
+    - _VertexDisplacementObjectScale: 1
+    - _VertexDisplacementTilingScale: 1
+    - _ZTestMode: 8
+    - _ZWrite: 0
+    m_Colors:
+    - _BaseColor: {r: 1, g: 0, b: 0, a: 0.741}
+    - _Color: {r: 1, g: 0, b: 0, a: 0.49803922}
+    - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
+    - _EmissionColor: {r: 1, g: 1, b: 1, a: 1}
+    - _EmissiveColor: {r: 0, g: 0, b: 0, a: 0}
+    - _SpecularColor: {r: 1, g: 1, b: 1, a: 1}
+    - _TransmittanceColor: {r: 1, g: 1, b: 1, a: 1}
+    - _UVDetailsMappingMask: {r: 1, g: 0, b: 0, a: 0}
+    - _UVMappingMask: {r: 1, g: 0, b: 0, a: 0}
--- a/SampleScenes/HDTest/SkyFogTest/Unlit_Transparent_PreMultipliedAlpha.mat.meta
+++ b/SampleScenes/HDTest/SkyFogTest/Unlit_Transparent_PreMultipliedAlpha.mat.meta
+fileFormatVersion: 2
+guid: 8dd3404cfeb7d08469dbd63457dc71a6
+timeCreated: 1507906791
+licenseType: Pro
+NativeFormatImporter:
+  externalObjects: {}
+  mainObjectFileID: 2100000
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
--- a/ScriptableRenderPipeline/HDRenderPipeline/Sky/SkyVariables.hlsl
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Sky/SkyVariables.hlsl
+#ifndef UNITY_SKY_VARIABLES_INCLUDED
+#define UNITY_SKY_VARIABLES_INCLUDED
+
+CBUFFER_START(SkyParameters)
+TEXTURECUBE(_SkyTexture);
+SAMPLERCUBE(sampler_SkyTexture); // NOTE: Sampler could be share here with _EnvTextures. Don't know if the shader compiler will complain...
+float _SkyTextureMipCount;
+CBUFFER_END
+
+float4 SampleSkyTexture(float3 texCoord)
+{
+    return SAMPLE_TEXTURECUBE(_SkyTexture, sampler_SkyTexture, texCoord);
+}
+
+float4 SampleSkyTexture(float3 texCoord, float lod)
+{
+    return SAMPLE_TEXTURECUBE_LOD(_SkyTexture, sampler_SkyTexture, texCoord, lod);
+}
+
+#endif
--- a/ScriptableRenderPipeline/HDRenderPipeline/Sky/SkyVariables.hlsl.meta
+++ b/ScriptableRenderPipeline/HDRenderPipeline/Sky/SkyVariables.hlsl.meta
+fileFormatVersion: 2
+guid: 7ed7d57e43fdd874ab5d047358e9fbe1
+timeCreated: 1508156067
+licenseType: Pro
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: