From 83ef08207d49c7295c4e7e09e286334d9cc355d9 Mon Sep 17 00:00:00 2001
From: jambuttenshaw <jamie.buttenshaw@gmail.com>
Date: Tue, 18 Nov 2025 11:23:07 +0000
Subject: [PATCH] Added user data field to draw item

---
 include/donut/render/GeometryPasses.h | 1 +
 src/render/DrawStrategy.cpp           | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/include/donut/render/GeometryPasses.h b/include/donut/render/GeometryPasses.h
index 371c2e9..b3a0293 100644
--- a/include/donut/render/GeometryPasses.h
+++ b/include/donut/render/GeometryPasses.h
@@ -49,6 +49,7 @@ namespace donut::render
         const engine::BufferGroup* buffers;
         float distanceToCamera;
         nvrhi::RasterCullMode cullMode;
+        void* userData;
     };
 
     class GeometryPassContext
diff --git a/src/render/DrawStrategy.cpp b/src/render/DrawStrategy.cpp
index 8a3954d..0b3c6ce 100644
--- a/src/render/DrawStrategy.cpp
+++ b/src/render/DrawStrategy.cpp
@@ -114,6 +114,7 @@ void InstancedOpaqueDrawStrategy::FillChunk()
                         item.buffers = item.mesh->buffers.get();
                         item.cullMode = (item.material->doubleSided) ? nvrhi::RasterCullMode::None : nvrhi::RasterCullMode::Back;
                         item.distanceToCamera = 0; // don't care
+                        item.userData = nullptr;
                         
                         ++writePtr;
                         ++itemCount;
@@ -222,6 +223,7 @@ void TransparentDrawStrategy::PrepareForView(const std::shared_ptr<engine::Scene
                         item.material = geometry->material.get();
                         item.buffers = mesh->buffers.get();
                         item.distanceToCamera = length(geometryGlobalBoundingBox.center() - viewOrigin);
+                        item.userData = nullptr;
                         if (material->doubleSided)
                         {
                             if (DrawDoubleSidedMaterialsSeparately)