From 4ddab0af397f611f6c3cf0aab0ff4f1214035d37 Mon Sep 17 00:00:00 2001
From: charlotte <charlotte.c.mcelwain@gmail.com>
Date: Mon, 31 Mar 2025 11:07:54 -0700
Subject: [PATCH] Add required shader defs for environment map binding arrays
 in deferred (#18634)

# Objective

Fixes #18468

## Solution

Missing shader defs caused shader compilation failure.
---
 crates/bevy_pbr/src/deferred/mod.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/crates/bevy_pbr/src/deferred/mod.rs b/crates/bevy_pbr/src/deferred/mod.rs
index c7d7e04636..e40b3a940a 100644
--- a/crates/bevy_pbr/src/deferred/mod.rs
+++ b/crates/bevy_pbr/src/deferred/mod.rs
@@ -345,6 +345,10 @@ impl SpecializedRenderPipeline for DeferredLightingLayout {
         } else if shadow_filter_method == MeshPipelineKey::SHADOW_FILTER_METHOD_TEMPORAL {
             shader_defs.push("SHADOW_FILTER_METHOD_TEMPORAL".into());
         }
+        if self.mesh_pipeline.binding_arrays_are_usable {
+            shader_defs.push("MULTIPLE_LIGHT_PROBES_IN_ARRAY".into());
+            shader_defs.push("MULTIPLE_LIGHTMAPS_IN_ARRAY".into());
+        }
 
         #[cfg(all(feature = "webgl", target_arch = "wasm32", not(feature = "webgpu")))]
         shader_defs.push("SIXTEEN_BYTE_ALIGNMENT".into());