Added builtin debug in shader pass forward unlit

ScriptableRenderPipeline/HDRenderPipeline/ShaderPass/ShaderPassForward.hlsl

 #endif
 
 #ifdef DEBUG_DISPLAY
+    // Same code in ShaderPassForward.shader
     if (_DebugViewMaterial != 0)
     {
         float3 result = float3(1.0, 0.0, 1.0);

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);
+    float4 outColor = float4(bsdfData.color + builtinData.emissiveColor, builtinData.opacity);
+
+#ifdef DEBUG_DISPLAY
+    // Same code in ShaderPassForwardUnlit.shader
+    if (_DebugViewMaterial != 0)
+    {
+        float3 result = float3(1.0, 0.0, 1.0);
+        bool needLinearToSRGB = false;
+
+        GetPropertiesDataDebug(_DebugViewMaterial, result, needLinearToSRGB);
+        GetVaryingsDataDebug(_DebugViewMaterial, input, result, needLinearToSRGB);
+        GetBuiltinDataDebug(_DebugViewMaterial, builtinData, result, needLinearToSRGB);
+        GetBSDFDataDebug(_DebugViewMaterial, bsdfData, result, needLinearToSRGB); // TODO: This required to initialize all field from BSDFData...
+
+        // TEMP!
+        // For now, the final blit in the backbuffer performs an sRGB write
+        // So in the meantime we apply the inverse transform to linear data to compensate.
+        if (!needLinearToSRGB)
+            result = SRGBToLinear(max(0, result));
+
+        outColor = float4(result, 1.0);
+    }
+#endif
+
+    return outColor;
 }