Merge pull request #68127 from Chaosus/shader_fix

Fix predefined constants to be accessible in the shader includes

servers/rendering/shader_language.cpp

@@ -1251,7 +1251,7 @@ bool ShaderLanguage::_find_identifier(const BlockNode *p_block, bool p_allow_rea
 	if (is_shader_inc) {
 		for (int i = 0; i < RenderingServer::SHADER_MAX; i++) {
 			for (const KeyValue<StringName, FunctionInfo> &E : ShaderTypes::get_singleton()->get_functions(RenderingServer::ShaderMode(i))) {
-				if ((current_function == E.key || E.key == "global") && E.value.built_ins.has(p_identifier)) {
+				if ((current_function == E.key || E.key == "global" || E.key == "constants") && E.value.built_ins.has(p_identifier)) {
 					if (r_data_type) {
 						*r_data_type = E.value.built_ins[p_identifier].type;
 					}