From bb00653645336c1993818a3daa6fb4e7675ee77f Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Thu, 22 Aug 2024 17:49:12 +0200
Subject: [PATCH] Fix regression in shadow maps rendering batching to ignore
 transparent materials due to opacity usage

---
 Source/Engine/Renderer/RenderList.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Source/Engine/Renderer/RenderList.cpp b/Source/Engine/Renderer/RenderList.cpp
index 2c3a5d0c5..32bb43732 100644
--- a/Source/Engine/Renderer/RenderList.cpp
+++ b/Source/Engine/Renderer/RenderList.cpp
@@ -1018,9 +1018,11 @@ bool SurfaceDrawCallHandler::CanBatch(const DrawCall& a, const DrawCall& b, Draw
             // Batch simple materials during depth-only drawing (when using default vertex shader and no pixel shader)
             if (pass == DrawPass::Depth)
             {
+                const MaterialInfo& aInfo = a.Material->GetInfo();
+                const MaterialInfo& bInfo = b.Material->GetInfo();
                 constexpr MaterialUsageFlags complexUsageFlags = MaterialUsageFlags::UseMask | MaterialUsageFlags::UsePositionOffset | MaterialUsageFlags::UseDisplacement;
-                const bool aIsSimple = EnumHasNoneFlags(a.Material->GetInfo().UsageFlags, complexUsageFlags);
-                const bool bIsSimple = EnumHasNoneFlags(b.Material->GetInfo().UsageFlags, complexUsageFlags);
+                const bool aIsSimple = EnumHasNoneFlags(aInfo.UsageFlags, complexUsageFlags) && aInfo.BlendMode == MaterialBlendMode::Opaque;
+                const bool bIsSimple = EnumHasNoneFlags(bInfo.UsageFlags, complexUsageFlags) && aInfo.BlendMode == MaterialBlendMode::Opaque;
                 return aIsSimple && bIsSimple;
             }
             return false;