HDRP: Fix issue with forward and preprocessor + update changelog

com.unity.render-pipelines.high-definition/CHANGELOG.md

 - Change code in area light with LTC for Lit shader. Magnitude is now take from FGD texture instead of a separate texture
 - Improve camera relative rendering: We now apply camera translation on the model matrix, so before the TransformObjectToWorld(). Note: unity_WorldToObject and unity_ObjectToWorld must never be used directly.
 - Rename positionWS to positionRWS (Camera relative world position) at a lot of places (mainly in interpolator and FragInputs). In case of custom shader user will be required to update their code.
+- Rename positionWS, capturePositionWS, proxyPositionWS, influencePositionWS to positionRWS, capturePositionRWS, proxyPositionRWS, influencePositionRWS (Camera relative world position) in LightDefinition struct.
+- Fix issue with forward opaque lit shader variant being removed by the shader preprocessor
 
 ## [2.0.4-preview]
 

com.unity.render-pipelines.high-definition/HDRP/Editor/BuildProcessors/HDRPreprocessShaders.cs

 
             int inputShaderVariantCount = inputData.Count;
 
-            ShaderCompilerData workaround = inputData[0];
-
             for (int i = 0; i < inputData.Count; ++i)
             {
                 ShaderCompilerData input = inputData[i];
                     i--;
                 }
             }
-
-            // Currently if a certain snippet is completely stripped (for example if you remove a whole pass) other passes might get broken
-            // To work around that, we make sure that we always have at least one variant.
-            // TODO: Remove this one it is fixed
-            if (inputData.Count == 0)
-                inputData.Add(workaround);
         }
     }
 }

com.unity.render-pipelines.high-definition/HDRP/Editor/Material/Lit/LitShaderPreprocessor.cs

                         return true;
                 }
 
-                if (!hdrpAsset.renderPipelineSettings.supportOnlyForward)
+                // TODO: add an option to say we are using only the deferred shader variant (for Lit)
+                //if (0)
-                    if (isForwardPass && !inputData.shaderKeywordSet.IsEnabled(m_DebugDisplay))
-                        return true;
+                    //if (isForwardPass && !inputData.shaderKeywordSet.IsEnabled(m_DebugDisplay))
+                    //    return true;
                 }
             }