From a08d921c4c778de542ac1d9b73490fc3037fcb17 Mon Sep 17 00:00:00 2001
From: Andrei Kortunov <andrei.kortunov@yandex.ru>
Date: Mon, 19 Jun 2023 09:54:09 +0400
Subject: [PATCH] Create a stateset for every particle system to create its own
 defineMap

---
 components/shader/shadervisitor.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/components/shader/shadervisitor.cpp b/components/shader/shadervisitor.cpp
index c9f9dc08fe..0112a3a699 100644
--- a/components/shader/shadervisitor.cpp
+++ b/components/shader/shadervisitor.cpp
@@ -893,6 +893,11 @@ namespace Shader
     {
         bool needPop = drawable.getStateSet() || mRequirements.empty();
 
+        // We need to push and pop a requirements object because particle systems can have
+        // different shader requirements to other drawables, so might need a different shader variant.
+        if (!needPop && dynamic_cast<osgParticle::ParticleSystem*>(&drawable))
+            needPop = true;
+
         if (needPop)
         {
             pushRequirements(drawable);