Tidied up mip map debugging in shaders based on PR feedback

ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/Debug.hlsl

     return mipCount==0 ? float4(1.0, 0.0, 1.0, 1.0) : (mipCount > 12 ? float4(1.0, 1.0, 1.0, 0.0) : color );
 }
 
-float4 GetMipLevelColor(float2 iUV, float4 texelSize)
+float4 GetMipLevelColor(float2 uv, float4 texelSize)
-    float mipLevel = ComputeTextureLOD(iUV, texelSize);
+    float mipLevel = ComputeTextureLOD(uv, texelSize);
     mipLevel = clamp(mipLevel, 0.0, 5.0 - 0.0001);
 
     float4 colors[6] = {
 }
 
 #ifdef DEBUG_DISPLAY
-#ifdef FRAG_INPUTS_DEFINED
-float3 GetTextureDataDebug(uint paramId, FragInputs input, Texture2D tex, float4 texelSize, float4 mipInfo, float3 originalColor)
+float3 GetTextureDataDebug(uint paramId, float2 uv, Texture2D tex, float4 texelSize, float4 mipInfo, float3 originalColor)
-        return GetDebugMipColorIncludingMipReduction(originalColor, tex, texelSize, input.texCoord0.xy, mipInfo);
+        return GetDebugMipColorIncludingMipReduction(originalColor, tex, texelSize, uv, mipInfo);
     case DEBUGMIPMAPMODE_MIP_COUNT:
         return GetDebugMipCountColor(originalColor, tex);
     case DEBUGMIPMAPMODE_MIP_COUNT_REDUCTION:
 
     return originalColor;
 }
-#endif // FRAG_INPUTS_DEFINED
 #endif // DEBUG_DISPLAY
 
 #endif // UNITY_DEBUG_INCLUDED

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

 
     AddDecalContribution(posInput.positionSS, surfaceData);
 
+#if defined(DEBUG_DISPLAY)
+    if (_DebugMipMapMode != DEBUGMIPMAPMODE_NONE)
+    {
+        surfaceData.baseColor = GetTextureDataDebug(_DebugMipMapMode, layerTexCoord.base0.uv, _BaseColorMap0, _BaseColorMap0_TexelSize, _BaseColorMap0_MipInfo, surfaceData.baseColor);
+        surfaceData.metallic = 0;
+    }
+#endif
+
     GetBuiltinData(input, surfaceData, alpha, bentNormalWS, depthOffset, builtinData);
 }
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/LitData.hlsl

     return SphericalCapIntersectionSolidArea(cosAv, cosAs, cosB) / (TWO_PI * (1.0 - cosAs));
 }
 
-void GetBuiltinData(FragInputs input, inout SurfaceData surfaceData, float alpha, float3 bentNormalWS, float depthOffset, out BuiltinData builtinData)
+void GetBuiltinData(FragInputs input, in SurfaceData surfaceData, float alpha, float3 bentNormalWS, float depthOffset, out BuiltinData builtinData)
 {
     // Builtin Data
     builtinData.opacity = alpha;
 #endif
 
     builtinData.depthOffset = depthOffset;
-
-#if defined(DEBUG_DISPLAY)
-    if (_DebugMipMapMode != DEBUGMIPMAPMODE_NONE)
-    {
-#ifdef LAYERED_LIT_SHADER
-        surfaceData.baseColor = GetTextureDataDebug(_DebugMipMapMode, input, _BaseColorMap0, _BaseColorMap0_TexelSize, _BaseColorMap0_MipInfo, surfaceData.baseColor);
-#else
-        surfaceData.baseColor = GetTextureDataDebug(_DebugMipMapMode, input, _BaseColorMap, _BaseColorMap_TexelSize, _BaseColorMap_MipInfo, surfaceData.baseColor);
-#endif
-        surfaceData.metallic = 0;
-    }
-#endif
 }
 
 // Struct that gather UVMapping info of all layers + common calculation
     surfaceData.tangentWS = Orthonormalize(surfaceData.tangentWS, surfaceData.normalWS);
 
     AddDecalContribution(posInput.positionSS, surfaceData);
+
+#if defined(DEBUG_DISPLAY)
+    if (_DebugMipMapMode != DEBUGMIPMAPMODE_NONE)
+    {
+        surfaceData.baseColor = GetTextureDataDebug(_DebugMipMapMode, layerTexCoord.base.uv, _BaseColorMap, _BaseColorMap_TexelSize, _BaseColorMap_MipInfo, surfaceData.baseColor);
+        surfaceData.metallic = 0;
+    }
+#endif
 
     // Caution: surfaceData must be fully initialize before calling GetBuiltinData
     GetBuiltinData(input, surfaceData, alpha, bentNormalWS, depthOffset, builtinData);

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Unlit/UnlitData.hlsl

 #if defined(DEBUG_DISPLAY)
     if (_DebugMipMapMode != DEBUGMIPMAPMODE_NONE)
     {
-        surfaceData.color = GetTextureDataDebug(_DebugMipMapMode, input, _UnlitColorMap, _UnlitColorMap_TexelSize, _UnlitColorMap_MipInfo, surfaceData.color);
+        surfaceData.color = GetTextureDataDebug(_DebugMipMapMode, unlitColorMapUv, _UnlitColorMap, _UnlitColorMap_TexelSize, _UnlitColorMap_MipInfo, surfaceData.color);
     }
 #endif
 }

ScriptableRenderPipeline/HDRenderPipeline/HDRP/ShaderPass/FragInputs.hlsl

 
 #include "../Debug/MaterialDebug.cs.hlsl"
 
-#define FRAG_INPUTS_DEFINED
 struct FragInputs
 {
     // Contain value return by SV_POSITION (That is name positionCS in PackedVarying).