From 92c6b715f47a7f01c25dcb7538007f0a942b9b84 Mon Sep 17 00:00:00 2001
From: Robert Swain <robert.swain@gmail.com>
Date: Mon, 30 Jan 2023 23:09:38 +0000
Subject: [PATCH] bevy_pbr: Clear fog DynamicUniformBuffer before populating
 each frame (#7432)

# Objective

- Fix a bug causing performance to drop over time because the GPU fog buffer was endlessly growing

## Solution

- Clear the fog buffer every frame before populating it
---
 crates/bevy_pbr/src/render/fog.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/crates/bevy_pbr/src/render/fog.rs b/crates/bevy_pbr/src/render/fog.rs
index f2bb22a73205f8..d3125e2e8975ac 100644
--- a/crates/bevy_pbr/src/render/fog.rs
+++ b/crates/bevy_pbr/src/render/fog.rs
@@ -53,6 +53,8 @@ pub fn prepare_fog(
     mut fog_meta: ResMut<FogMeta>,
     views: Query<(Entity, Option<&FogSettings>), With<ExtractedView>>,
 ) {
+    fog_meta.gpu_fogs.clear();
+
     for (entity, fog) in &views {
         let gpu_fog = if let Some(fog) = fog {
             match &fog.falloff {