Fix lightmap UVs for instanced terrain.

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/LayeredLit/TerrainLit.shader

             #include "../../Debug/DebugDisplay.hlsl"
             #endif
             #include "../../Material/Material.hlsl"
-            #include "../Lit/ShaderPass/LitSharePass.hlsl"
+            #include "TerrainLitSharePass.hlsl"
             #include "TerrainLitData.hlsl"
             #include "../../ShaderPass/ShaderPassGBuffer.hlsl"
 
             #define SHADERPASS SHADERPASS_LIGHT_TRANSPORT
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
-            #include "../Lit/ShaderPass/LitSharePass.hlsl"
+            #include "TerrainLitSharePass.hlsl"
             #include "TerrainLitData.hlsl"
             #include "../../ShaderPass/ShaderPassLightTransport.hlsl"
 
             #include "../../Debug/DebugDisplay.hlsl"
             #endif
             #include "../../Lighting/Lighting.hlsl"
-            #include "../Lit/ShaderPass/LitSharePass.hlsl"
+            #include "TerrainLitSharePass.hlsl"
             #include "TerrainLitData.hlsl"
             #include "../../ShaderPass/ShaderPassForward.hlsl"
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/LayeredLit/TerrainLitData.hlsl

 
 void GetSurfaceAndBuiltinData(FragInputs input, float3 V, inout PositionInputs posInput, out SurfaceData surfaceData, out BuiltinData builtinData)
 {
+    // terrain lightmap uvs are always taken from uv0
+    input.texCoord1 = input.texCoord2 = input.texCoord0;
+
     ApplyDoubleSidedFlipOrMirror(input); // Apply double sided flip on the vertex normal
 
     LayerTexCoord layerTexCoord;

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/LayeredLit/TerrainLitSharePass.hlsl

+#ifndef SHADERPASS
+#error Undefine_SHADERPASS
+#endif
+
+// This first set of define allow to say which attributes will be use by the mesh in the vertex and domain shader (for tesselation)
+
+// Attributes
+#define ATTRIBUTES_NEED_NORMAL
+#define ATTRIBUTES_NEED_TEXCOORD0
+#define ATTRIBUTES_NEED_TANGENT // will be filled by ApplyPreVertexModification()
+
+#if SHADERPASS == SHADERPASS_LIGHT_TRANSPORT
+    #define ATTRIBUTES_NEED_TEXCOORD1
+    #define ATTRIBUTES_NEED_TEXCOORD2
+#endif
+
+// Varying - Use for pixel shader
+// This second set of define allow to say which varyings will be output in the vertex (no more tesselation)
+#define VARYINGS_NEED_POSITION_WS
+#define VARYINGS_NEED_TANGENT_TO_WORLD
+#define VARYINGS_NEED_TEXCOORD0
+
+#ifdef _DOUBLESIDED_ON
+    #define VARYINGS_NEED_CULLFACE
+#endif
+
+// This include will define the various Attributes/Varyings structure
+#include "../../ShaderPass/VaryingMesh.hlsl"

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/LayeredLit/TerrainLitSharePass.hlsl.meta

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