From b0356bcb72a4647699c8e9c7ab1370f563ef81bc Mon Sep 17 00:00:00 2001
From: Yuri Roubinsky <chaosus89@gmail.com>
Date: Thu, 13 Jan 2022 14:39:35 +0300
Subject: [PATCH] Prevent redefinition of main functions in shader

---
 servers/rendering/shader_language.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/servers/rendering/shader_language.cpp b/servers/rendering/shader_language.cpp
index adbcdedaccf..c4d9ba4260f 100644
--- a/servers/rendering/shader_language.cpp
+++ b/servers/rendering/shader_language.cpp
@@ -8774,6 +8774,13 @@ Error ShaderLanguage::_parse_shader(const Map<StringName, FunctionInfo> &p_funct
 					}
 				}
 
+				for (int i = 0; i < shader->functions.size(); i++) {
+					if (!shader->functions[i].callable && shader->functions[i].name == name) {
+						_set_error("Redefinition of '" + String(name) + "'");
+						return ERR_PARSE_ERROR;
+					}
+				}
+
 				ShaderNode::Function function;
 
 				function.callable = !p_functions.has(name);