From dc6f90acd804f3269540c6448bd108128d1d6ffe Mon Sep 17 00:00:00 2001
From: Chaosus <chaosus89@gmail.com>
Date: Thu, 8 Aug 2024 11:23:27 +0300
Subject: [PATCH] Forbid function declaration with a const qualifier in shaders

---
 servers/rendering/shader_language.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/servers/rendering/shader_language.cpp b/servers/rendering/shader_language.cpp
index 0235d72cfa0..3247c6d9924 100644
--- a/servers/rendering/shader_language.cpp
+++ b/servers/rendering/shader_language.cpp
@@ -9640,6 +9640,11 @@ Error ShaderLanguage::_parse_shader(const HashMap<StringName, FunctionInfo> &p_f
 					break;
 				}
 
+				if (is_constant) {
+					_set_error(vformat(RTR("'%s' qualifier cannot be used with a function return type."), "const"));
+					return ERR_PARSE_ERROR;
+				}
+
 				FunctionInfo builtins;
 				if (p_functions.has(name)) {
 					builtins = p_functions[name];