Fixed LUT initialization in Wireframe mode (#5156)

Co-authored-by: sebastienlagarde <[email protected]>

Author: adrien-de-tocqueville

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

@@ -358,6 +358,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed motion vector for custom meshes loaded from compute buffer in shader graph (like Hair)
 - Fixed incorrect light list indexing when TAA is enabled (case 1352444).
 - Fixed Additional Velocity for Alembic not taking correctly into account vertex animation
+- Fixed wrong LUT initialization in Wireframe mode.
 
 ### Changed
 - Changed Window/Render Pipeline/HD Render Pipeline Wizard to Window/Rendering/HDRP Wizard

com.unity.render-pipelines.high-definition/Runtime/Material/AxF/AxF.cs

@@ -285,6 +285,13 @@ public override void RenderInit(CommandBuffer cmd)
                 return;
             }
 
+            if (GL.wireframe)
+            {
+                m_preIntegratedFGD_Ward.Create();
+                m_preIntegratedFGD_CookTorrance.Create();
+                return;
+            }
+
             using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.PreIntegradeWardCookTorrance)))
             {
                 CoreUtils.DrawFullScreen(cmd, m_preIntegratedFGDMaterial_Ward, new RenderTargetIdentifier(m_preIntegratedFGD_Ward));

com.unity.render-pipelines.high-definition/Runtime/Material/PreIntegratedFGD/PreIntegratedFGD.cs

@@ -104,6 +104,14 @@ public void RenderInit(FGDIndex index, CommandBuffer cmd)
             if (m_isInit[(int)index] && m_PreIntegratedFGD[(int)index].IsCreated())
                 return;
 
+            // If we are in wireframe mode, the drawfullscreen will not work as expected, but we don't need the LUT anyway
+            // So create the texture to avoid errors, it will be initialized by the first render without wireframe
+            if (GL.wireframe)
+            {
+                m_PreIntegratedFGD[(int)index].Create();
+                return;
+            }
+
             CoreUtils.DrawFullScreen(cmd, m_PreIntegratedFGDMaterial[(int)index], new RenderTargetIdentifier(m_PreIntegratedFGD[(int)index]));
             m_isInit[(int)index] = true;
         }