diff --git a/editor/plugins/visual_shader_editor_plugin.cpp b/editor/plugins/visual_shader_editor_plugin.cpp
index cb071e6e3dbc..6112bb2c81f9 100644
--- a/editor/plugins/visual_shader_editor_plugin.cpp
+++ b/editor/plugins/visual_shader_editor_plugin.cpp
@@ -704,7 +704,7 @@ void VisualShaderGraphPlugin::add_node(VisualShader::Type p_type, int p_id, bool
 			// Add "Edit" button to group node titlebar.
 			Button *edit_group_btn = memnew(Button);
 			edit_group_btn->set_text(TTR("Edit"));
-			edit_group_btn->set_icon(editor->get_theme_icon("Edit", "EditorIcons"));
+			edit_group_btn->set_button_icon(editor->get_theme_icon("Edit", "EditorIcons"));
 			edit_group_btn->connect("pressed", callable_mp(editor, &VisualShaderEditor::_edit_group_in_graph).bind(p_id), CONNECT_DEFERRED);
 			titlebar->add_child(edit_group_btn);
 
@@ -2725,7 +2725,7 @@ void VisualShaderEditor::_update_parameter_refs(HashSet<String> &p_deleted_names
 }
 
 void VisualShaderEditor::_update_graph() {
-	if (editing_shader_graph == nullptr) {
+	if (editing_shader_graph.is_null()) {
 		return;
 	}
 
diff --git a/scene/resources/visual_shader.cpp b/scene/resources/visual_shader.cpp
index 0d4bfb93a70d..40698e26255f 100644
--- a/scene/resources/visual_shader.cpp
+++ b/scene/resources/visual_shader.cpp
@@ -33,6 +33,7 @@
 #include "core/templates/rb_map.h"
 #include "core/templates/vmap.h"
 #include "core/variant/variant_utility.h"
+#include "scene/resources/visual_shader_group.h"
 #include "servers/rendering/shader_types.h"
 #include "visual_shader_nodes.h"
 #include "visual_shader_particle_nodes.h"
@@ -205,239 +206,826 @@ void ShaderGraph::_get_property_list(List<PropertyInfo> *p_list) const {
 	p_list->push_back(PropertyInfo(Variant::PACKED_INT32_ARRAY, "nodes/connections", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
 }
 
-bool ShaderGraph::_check_reroute_subgraph(int p_target_port_type, int p_reroute_node, List<int> *r_visited_reroute_nodes) const {
-	// BFS to check whether connecting to the given subgraph (rooted at p_reroute_node) is valid.
-	List<int> queue;
-	queue.push_back(p_reroute_node);
-	if (r_visited_reroute_nodes != nullptr) {
-		r_visited_reroute_nodes->push_back(p_reroute_node);
-	}
-	while (!queue.is_empty()) {
-		int current_node_id = queue.front()->get();
-		ShaderGraph::Node current_node = nodes[current_node_id];
-		queue.pop_front();
-		for (const int &next_node_id : current_node.next_connected_nodes) {
-			Ref<VisualShaderNodeReroute> next_vsnode = nodes[next_node_id].node;
-			if (next_vsnode.is_valid()) {
-				queue.push_back(next_node_id);
-				if (r_visited_reroute_nodes != nullptr) {
-					r_visited_reroute_nodes->push_back(next_node_id);
-				}
-				continue;
-			}
-			// Check whether all ports connected with the reroute node are compatible.
-			for (const ShaderGraph::Connection &c : connections) {
-				VisualShaderNode::PortType to_port_type = nodes[next_node_id].node->get_input_port_type(c.to_port);
-				if (c.from_node == current_node_id &&
-						c.to_node == next_node_id &&
-						!is_port_types_compatible(p_target_port_type, to_port_type)) {
-					return false;
-				}
-			}
-		}
-	}
-	return true;
-}
-
-void ShaderGraph::add_node(const Ref<VisualShaderNode> &p_node, const Vector2 &p_position, int p_id) {
-	ERR_FAIL_COND(p_node.is_null());
-	ERR_FAIL_COND(p_id < 2); // Reserved for the output node.
-	ERR_FAIL_COND(nodes.has(p_id));
-
-	ShaderGraph::Node n;
-	n.node = p_node;
-	n.position = p_position;
-
-	Ref<VisualShaderNodeParameter> parameter = n.node;
-	if (parameter.is_valid()) {
-		String valid_name = validate_parameter_name(parameter->get_parameter_name(), parameter);
-		parameter->set_parameter_name(valid_name);
-	}
-
-	Ref<VisualShaderNodeCustom> custom = n.node;
-	if (custom.is_valid()) {
-		custom->update_ports();
-	}
-
-	nodes[p_id] = n;
-
-	n.node->connect_changed(callable_mp(this, &ShaderGraph::_node_changed));
-	emit_signal("graph_changed");
-}
-
-void ShaderGraph::set_node_position(int p_id, const Vector2 &p_position) {
-	ERR_FAIL_COND(!nodes.has(p_id));
-	nodes[p_id].position = p_position;
-}
-
-Vector2 ShaderGraph::get_node_position(int p_id) const {
-	ERR_FAIL_COND_V(!nodes.has(p_id), Vector2());
-	return nodes[p_id].position;
-}
-
-Ref<VisualShaderNode> ShaderGraph::get_node(int p_id) const {
-	if (!nodes.has(p_id)) {
-		return Ref<VisualShaderNode>();
-	}
-	ERR_FAIL_COND_V(!nodes.has(p_id), Ref<VisualShaderNode>());
-	return nodes[p_id].node;
-}
+// TODO: Refactor (simplify, rename and change comment style)
+Error ShaderGraph::_write_node(
+		StringBuilder *p_global_code,
+		StringBuilder *p_global_code_per_node,
+		HashMap<Type, StringBuilder> *p_global_code_per_func,
+		StringBuilder &r_code, Vector<ShaderGraph::DefaultTextureParam> &r_def_tex_params,
+		const VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> &p_input_connections,
+		const VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> &p_output_connections,
+		int p_node,
+		HashSet<int> &r_processed,
+		bool p_for_preview,
+		HashSet<StringName> &r_classes,
+		Type p_type,
+		Shader::Mode p_mode) const {
+	const Ref<VisualShaderNode> vsnode = nodes[p_node].node;
 
-Vector<int> ShaderGraph::get_node_ids() const {
-	Vector<int> ret;
-	for (const KeyValue<int, ShaderGraph::Node> &E : nodes) {
-		ret.push_back(E.key);
+	if (vsnode->is_disabled()) {
+		r_code += "// " + vsnode->get_caption() + ":" + itos(p_node) + "\n";
+		r_code += "	// Node is disabled and code is not generated.\n";
+		return OK;
 	}
 
-	return ret;
-}
+	// Check inputs recursively first.
+	int input_count = vsnode->get_input_port_count();
+	for (int i = 0; i < input_count; i++) {
+		ConnectionKey ck;
+		ck.node = p_node;
+		ck.port = i;
 
-int ShaderGraph::get_valid_node_id() const {
-	return nodes.size() ? MAX(2, nodes.back()->key() + 1) : 2;
-}
+		if (p_input_connections.has(ck)) {
+			int from_node = p_input_connections[ck]->get().from_node;
+			if (r_processed.has(from_node)) {
+				continue;
+			}
 
-int ShaderGraph::find_node_id(const Ref<VisualShaderNode> &p_node) const {
-	for (const KeyValue<int, ShaderGraph::Node> &E : nodes) {
-		if (E.value.node == p_node) {
-			return E.key;
+			Error err = _write_node(p_global_code, p_global_code_per_node, p_global_code_per_func, r_code, r_def_tex_params, p_input_connections, p_output_connections, from_node, r_processed, p_for_preview, r_classes, p_type, p_mode);
+			if (err) {
+				return err;
+			}
 		}
 	}
 
-	return NODE_ID_INVALID;
-}
+	// Then this node.
 
-void ShaderGraph::remove_node(int p_id) {
-	ERR_FAIL_COND(!nodes.has(p_id));
+	Vector<ShaderGraph::DefaultTextureParam> params = vsnode->get_default_texture_parameters((VisualShader::Type)p_type, p_node);
+	for (int i = 0; i < params.size(); i++) {
+		r_def_tex_params.push_back(params[i]);
+	}
 
-	nodes.erase(p_id);
+	Ref<VisualShaderNodeInput> input = vsnode;
+	bool skip_global = input.is_valid() && p_for_preview;
 
-	for (List<ShaderGraph::Connection>::Element *E = connections.front(); E;) {
-		List<ShaderGraph::Connection>::Element *N = E->next();
-		const ShaderGraph::Connection &connection = E->get();
-		if (connection.from_node == p_id || connection.to_node == p_id) {
-			if (connection.from_node == p_id) {
-				nodes[connection.to_node].prev_connected_nodes.erase(p_id);
-				nodes[connection.to_node].node->set_input_port_connected(connection.to_port, false);
-			} else if (connection.to_node == p_id) {
-				nodes[connection.from_node].next_connected_nodes.erase(p_id);
-				nodes[connection.from_node].node->set_output_port_connected(connection.from_port, false);
+	if (!skip_global) {
+		Ref<VisualShaderNodeParameter> parameter = vsnode;
+		if (!parameter.is_valid() || !parameter->is_global_code_generated()) {
+			if (p_global_code) {
+				*p_global_code += vsnode->generate_global(p_mode, (VisualShader::Type)p_type, p_node);
 			}
-			connections.erase(E);
 		}
-		E = N;
-	}
-
-	emit_signal("graph_changed");
-}
-
-void ShaderGraph::replace_node(int p_id, const StringName &p_new_class) {
-	ERR_FAIL_COND(!nodes.has(p_id));
-
-	if (nodes[p_id].node->get_class_name() == p_new_class) {
-		return;
-	}
-	VisualShaderNode *vsn = Object::cast_to<VisualShaderNode>(ClassDB::instantiate(p_new_class));
-	VisualShaderNode *prev_vsn = nodes[p_id].node.ptr();
 
-	// Update connection data.
-	for (int i = 0; i < vsn->get_output_port_count(); i++) {
-		if (i < prev_vsn->get_output_port_count()) {
-			if (prev_vsn->is_output_port_connected(i)) {
-				vsn->set_output_port_connected(i, true);
+		String class_name = vsnode->get_class_name();
+		if (class_name == "VisualShaderNodeCustom") {
+			class_name = vsnode->get_script_instance()->get_script()->get_path();
+		}
+		if (!r_classes.has(class_name)) {
+			if (p_global_code_per_node) {
+				*p_global_code_per_node += vsnode->generate_global_per_node(p_mode, p_node);
 			}
-
-			if (prev_vsn->is_output_port_expandable(i) && prev_vsn->_is_output_port_expanded(i) && vsn->is_output_port_expandable(i)) {
-				vsn->_set_output_port_expanded(i, true);
-
-				int component_count = 0;
-				switch (prev_vsn->get_output_port_type(i)) {
-					case VisualShaderNode::PORT_TYPE_VECTOR_2D:
-						component_count = 2;
-						break;
-					case VisualShaderNode::PORT_TYPE_VECTOR_3D:
-						component_count = 3;
-						break;
-					case VisualShaderNode::PORT_TYPE_VECTOR_4D:
-						component_count = 4;
-						break;
-					default:
-						break;
+			for (int i = 0; i < VisualShader::TYPE_MAX; i++) {
+				if (p_global_code_per_func) {
+					(*p_global_code_per_func)[Type(i)] += vsnode->generate_global_per_func(p_mode, VisualShader::Type(i), p_node);
 				}
+			}
+			r_classes.insert(class_name);
+		}
 
-				for (int j = 0; j < component_count; j++) {
-					int sub_port = i + 1 + j;
-
-					if (prev_vsn->is_output_port_connected(sub_port)) {
-						vsn->set_output_port_connected(sub_port, true);
-					}
+		// Generate node group functions only once globally.
+		Ref<VisualShaderNodeGroup> group = vsnode;
+		if (group.is_valid()) {
+			// TODO: Use UID for group function names.
+			if (!r_classes.has("GROUP_" + group->get_group()->get_group_name())) {
+				if (p_global_code_per_node) {
+					*p_global_code_per_node += group->generate_group_function(p_mode, (VisualShader::Type)p_type, p_node);
 				}
-
-				i += component_count;
+				r_classes.insert("GROUP_" + group->get_group()->get_group_name());
 			}
-		} else {
-			break;
 		}
 	}
 
-	nodes[p_id].node = Ref<VisualShaderNode>(vsn);
-
-	emit_signal("graph_changed");
-}
-
-bool ShaderGraph::are_nodes_connected(int p_from_node, int p_from_port, int p_to_node, int p_to_port) const {
-	for (const ShaderGraph::Connection &E : connections) {
-		if (E.from_node == p_from_node && E.from_port == p_from_port && E.to_node == p_to_node && E.to_port == p_to_port) {
-			return true;
-		}
+	if (!vsnode->is_code_generated()) { // Just generate globals and ignore locals.
+		r_processed.insert(p_node);
+		return OK;
 	}
 
-	return false;
-}
-
-bool ShaderGraph::is_nodes_connected_relatively(int p_node, int p_target) const {
-	bool result = false;
-
-	const ShaderGraph::Node &node = nodes[p_node];
-
-	for (const int &E : node.prev_connected_nodes) {
-		if (E == p_target) {
-			return true;
-		}
+	String node_name = "// " + vsnode->get_caption() + ":" + itos(p_node) + "\n";
+	String node_code;
+	Vector<String> input_vars;
 
-		result = is_nodes_connected_relatively(E, p_target);
-		if (result) {
-			break;
-		}
-	}
-	return result;
-}
+	input_vars.resize(vsnode->get_input_port_count());
+	String *inputs = input_vars.ptrw();
 
-bool ShaderGraph::can_connect_nodes(int p_from_node, int p_from_port, int p_to_node, int p_to_port) const {
-	if (!nodes.has(p_from_node)) {
-		return false;
-	}
+	for (int i = 0; i < input_count; i++) {
+		ConnectionKey ck;
+		ck.node = p_node;
+		ck.port = i;
 
-	if (p_from_node == p_to_node) {
-		return false;
-	}
+		if (p_input_connections.has(ck)) {
+			// Connected to something, use that output.
+			int from_node = p_input_connections[ck]->get().from_node;
 
-	if (p_from_port < 0 || p_from_port >= nodes[p_from_node].node->get_expanded_output_port_count()) {
-		return false;
-	}
+			if (nodes[from_node].node->is_disabled()) {
+				continue;
+			}
 
-	if (!nodes.has(p_to_node)) {
-		return false;
-	}
+			int from_port = p_input_connections[ck]->get().from_port;
 
-	if (p_to_port < 0 || p_to_port >= nodes[p_to_node].node->get_input_port_count()) {
-		return false;
-	}
+			VisualShaderNode::PortType in_type = vsnode->get_input_port_type(i);
+			VisualShaderNode::PortType out_type = nodes[from_node].node->get_output_port_type(from_port);
 
-	VisualShaderNode::PortType from_port_type = nodes[p_from_node].node->get_output_port_type(p_from_port);
-	VisualShaderNode::PortType to_port_type = nodes[p_to_node].node->get_input_port_type(p_to_port);
+			String src_var = "n_out" + itos(from_node) + "p" + itos(from_port);
 
-	Ref<VisualShaderNodeReroute> to_node_reroute = nodes[p_to_node].node;
-	if (to_node_reroute.is_valid()) {
+			if (in_type == VisualShaderNode::PORT_TYPE_SAMPLER && out_type == VisualShaderNode::PORT_TYPE_SAMPLER) {
+				VisualShaderNode *ptr = const_cast<VisualShaderNode *>(nodes[from_node].node.ptr());
+				// FIXME: This needs to be refactored at some point.
+				if (ptr->has_method("get_input_real_name")) {
+					inputs[i] = ptr->call("get_input_real_name");
+				} else if (ptr->has_method("get_parameter_name")) {
+					inputs[i] = ptr->call("get_parameter_name");
+				} else {
+					Ref<VisualShaderNodeReroute> reroute = nodes[from_node].node;
+					if (reroute.is_valid()) {
+						inputs[i] = get_reroute_parameter_name(from_node);
+					} else {
+						inputs[i] = "";
+					}
+				}
+			} else if (in_type == out_type) {
+				inputs[i] = src_var;
+			} else {
+				switch (in_type) {
+					case VisualShaderNode::PORT_TYPE_SCALAR: {
+						switch (out_type) {
+							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
+								inputs[i] = "float(" + src_var + ")";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
+								inputs[i] = "float(" + src_var + ")";
+							} break;
+							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
+								inputs[i] = "(" + src_var + " ? 1.0 : 0.0)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+								inputs[i] = src_var + ".x";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+								inputs[i] = src_var + ".x";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+								inputs[i] = src_var + ".x";
+							} break;
+							default:
+								break;
+						}
+					} break;
+					case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
+						switch (out_type) {
+							case VisualShaderNode::PORT_TYPE_SCALAR: {
+								inputs[i] = "int(" + src_var + ")";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
+								inputs[i] = "int(" + src_var + ")";
+							} break;
+							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
+								inputs[i] = "(" + src_var + " ? 1 : 0)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+								inputs[i] = "int(" + src_var + ".x)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+								inputs[i] = "int(" + src_var + ".x)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+								inputs[i] = "int(" + src_var + ".x)";
+							} break;
+							default:
+								break;
+						}
+					} break;
+					case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
+						switch (out_type) {
+							case VisualShaderNode::PORT_TYPE_SCALAR: {
+								inputs[i] = "uint(" + src_var + ")";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
+								inputs[i] = "uint(" + src_var + ")";
+							} break;
+							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
+								inputs[i] = "(" + src_var + " ? 1u : 0u)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+								inputs[i] = "uint(" + src_var + ".x)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+								inputs[i] = "uint(" + src_var + ".x)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+								inputs[i] = "uint(" + src_var + ".x)";
+							} break;
+							default:
+								break;
+						}
+					} break;
+					case VisualShaderNode::PORT_TYPE_BOOLEAN: {
+						switch (out_type) {
+							case VisualShaderNode::PORT_TYPE_SCALAR: {
+								inputs[i] = src_var + " > 0.0 ? true : false";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
+								inputs[i] = src_var + " > 0 ? true : false";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
+								inputs[i] = src_var + " > 0u ? true : false";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+								inputs[i] = "all(bvec2(" + src_var + "))";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+								inputs[i] = "all(bvec3(" + src_var + "))";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+								inputs[i] = "all(bvec4(" + src_var + "))";
+							} break;
+							default:
+								break;
+						}
+					} break;
+					case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+						switch (out_type) {
+							case VisualShaderNode::PORT_TYPE_SCALAR: {
+								inputs[i] = "vec2(" + src_var + ")";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
+								inputs[i] = "vec2(float(" + src_var + "))";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
+								inputs[i] = "vec2(float(" + src_var + "))";
+							} break;
+							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
+								inputs[i] = "vec2(" + src_var + " ? 1.0 : 0.0)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_3D:
+							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+								inputs[i] = "vec2(" + src_var + ".xy)";
+							} break;
+							default:
+								break;
+						}
+					} break;
+
+					case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+						switch (out_type) {
+							case VisualShaderNode::PORT_TYPE_SCALAR: {
+								inputs[i] = "vec3(" + src_var + ")";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
+								inputs[i] = "vec3(float(" + src_var + "))";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
+								inputs[i] = "vec3(float(" + src_var + "))";
+							} break;
+							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
+								inputs[i] = "vec3(" + src_var + " ? 1.0 : 0.0)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+								inputs[i] = "vec3(" + src_var + ", 0.0)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+								inputs[i] = "vec3(" + src_var + ".xyz)";
+							} break;
+							default:
+								break;
+						}
+					} break;
+					case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+						switch (out_type) {
+							case VisualShaderNode::PORT_TYPE_SCALAR: {
+								inputs[i] = "vec4(" + src_var + ")";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
+								inputs[i] = "vec4(float(" + src_var + "))";
+							} break;
+							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
+								inputs[i] = "vec4(float(" + src_var + "))";
+							} break;
+							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
+								inputs[i] = "vec4(" + src_var + " ? 1.0 : 0.0)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+								inputs[i] = "vec4(" + src_var + ", 0.0, 0.0)";
+							} break;
+							case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+								inputs[i] = "vec4(" + src_var + ", 0.0)";
+							} break;
+							default:
+								break;
+						}
+					} break;
+					default:
+						break;
+				}
+			}
+		} else {
+			if (!vsnode->is_generate_input_var(i)) {
+				continue;
+			}
+
+			Variant defval = vsnode->get_input_port_default_value(i);
+			if (defval.get_type() == Variant::FLOAT) {
+				float val = defval;
+				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
+				node_code += "	float " + inputs[i] + " = " + vformat("%.5f", val) + ";\n";
+			} else if (defval.get_type() == Variant::INT) {
+				int val = defval;
+				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
+				if (vsnode->get_input_port_type(i) == VisualShaderNode::PORT_TYPE_SCALAR_UINT) {
+					node_code += "	uint " + inputs[i] + " = " + itos(val) + "u;\n";
+				} else {
+					node_code += "	int " + inputs[i] + " = " + itos(val) + ";\n";
+				}
+			} else if (defval.get_type() == Variant::BOOL) {
+				bool val = defval;
+				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
+				node_code += "	bool " + inputs[i] + " = " + (val ? "true" : "false") + ";\n";
+			} else if (defval.get_type() == Variant::VECTOR2) {
+				Vector2 val = defval;
+				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
+				node_code += "	vec2 " + inputs[i] + " = " + vformat("vec2(%.5f, %.5f);\n", val.x, val.y);
+			} else if (defval.get_type() == Variant::VECTOR3) {
+				Vector3 val = defval;
+				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
+				node_code += "	vec3 " + inputs[i] + " = " + vformat("vec3(%.5f, %.5f, %.5f);\n", val.x, val.y, val.z);
+			} else if (defval.get_type() == Variant::VECTOR4) {
+				Vector4 val = defval;
+				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
+				node_code += "	vec4 " + inputs[i] + " = " + vformat("vec4(%.5f, %.5f, %.5f, %.5f);\n", val.x, val.y, val.z, val.w);
+			} else if (defval.get_type() == Variant::QUATERNION) {
+				Quaternion val = defval;
+				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
+				node_code += "	vec4 " + inputs[i] + " = " + vformat("vec4(%.5f, %.5f, %.5f, %.5f);\n", val.x, val.y, val.z, val.w);
+			} else if (defval.get_type() == Variant::TRANSFORM3D) {
+				Transform3D val = defval;
+				val.basis.transpose();
+				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
+				Array values;
+				for (int j = 0; j < 3; j++) {
+					values.push_back(val.basis[j].x);
+					values.push_back(val.basis[j].y);
+					values.push_back(val.basis[j].z);
+				}
+				values.push_back(val.origin.x);
+				values.push_back(val.origin.y);
+				values.push_back(val.origin.z);
+				bool err = false;
+				node_code += "	mat4 " + inputs[i] + " = " + String("mat4(vec4(%.5f, %.5f, %.5f, 0.0), vec4(%.5f, %.5f, %.5f, 0.0), vec4(%.5f, %.5f, %.5f, 0.0), vec4(%.5f, %.5f, %.5f, 1.0));\n").sprintf(values, &err);
+			} else {
+				// TODO: Cleanup
+				// Will go empty, node is expected to know what it is doing at this point and handle it.
+			}
+		}
+	}
+
+	int output_count = vsnode->get_output_port_count();
+	int initial_output_count = output_count;
+
+	HashMap<int, bool> expanded_output_ports;
+
+	for (int i = 0; i < initial_output_count; i++) {
+		bool expanded = false;
+
+		if (vsnode->is_output_port_expandable(i) && vsnode->_is_output_port_expanded(i)) {
+			expanded = true;
+
+			switch (vsnode->get_output_port_type(i)) {
+				case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+					output_count += 2;
+				} break;
+				case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+					output_count += 3;
+				} break;
+				case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+					output_count += 4;
+				} break;
+				default:
+					break;
+			}
+		}
+		expanded_output_ports.insert(i, expanded);
+	}
+
+	Vector<String> output_vars;
+	output_vars.resize(output_count);
+	String *outputs = output_vars.ptrw();
+
+	if (vsnode->is_simple_decl()) { // Less code to generate for some simple_decl nodes.
+		for (int i = 0, j = 0; i < initial_output_count; i++, j++) {
+			String var_name = "n_out" + itos(p_node) + "p" + itos(j);
+			switch (vsnode->get_output_port_type(i)) {
+				case VisualShaderNode::PORT_TYPE_SCALAR:
+					outputs[i] = "float " + var_name;
+					break;
+				case VisualShaderNode::PORT_TYPE_SCALAR_INT:
+					outputs[i] = "int " + var_name;
+					break;
+				case VisualShaderNode::PORT_TYPE_SCALAR_UINT:
+					outputs[i] = "uint " + var_name;
+					break;
+				case VisualShaderNode::PORT_TYPE_VECTOR_2D:
+					outputs[i] = "vec2 " + var_name;
+					break;
+				case VisualShaderNode::PORT_TYPE_VECTOR_3D:
+					outputs[i] = "vec3 " + var_name;
+					break;
+				case VisualShaderNode::PORT_TYPE_VECTOR_4D:
+					outputs[i] = "vec4 " + var_name;
+					break;
+				case VisualShaderNode::PORT_TYPE_BOOLEAN:
+					outputs[i] = "bool " + var_name;
+					break;
+				case VisualShaderNode::PORT_TYPE_TRANSFORM:
+					outputs[i] = "mat4 " + var_name;
+					break;
+				default:
+					break;
+			}
+			if (expanded_output_ports[i]) {
+				switch (vsnode->get_output_port_type(i)) {
+					case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+						j += 2;
+					} break;
+					case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+						j += 3;
+					} break;
+					case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+						j += 4;
+					} break;
+					default:
+						break;
+				}
+			}
+		}
+
+	} else {
+		for (int i = 0, j = 0; i < initial_output_count; i++, j++) {
+			outputs[i] = "n_out" + itos(p_node) + "p" + itos(j);
+			switch (vsnode->get_output_port_type(i)) {
+				case VisualShaderNode::PORT_TYPE_SCALAR:
+					r_code += "	float " + outputs[i] + ";\n";
+					break;
+				case VisualShaderNode::PORT_TYPE_SCALAR_INT:
+					r_code += "	int " + outputs[i] + ";\n";
+					break;
+				case VisualShaderNode::PORT_TYPE_SCALAR_UINT:
+					r_code += "	uint " + outputs[i] + ";\n";
+					break;
+				case VisualShaderNode::PORT_TYPE_VECTOR_2D:
+					r_code += "	vec2 " + outputs[i] + ";\n";
+					break;
+				case VisualShaderNode::PORT_TYPE_VECTOR_3D:
+					r_code += "	vec3 " + outputs[i] + ";\n";
+					break;
+				case VisualShaderNode::PORT_TYPE_VECTOR_4D:
+					r_code += "	vec4 " + outputs[i] + ";\n";
+					break;
+				case VisualShaderNode::PORT_TYPE_BOOLEAN:
+					r_code += "	bool " + outputs[i] + ";\n";
+					break;
+				case VisualShaderNode::PORT_TYPE_TRANSFORM:
+					r_code += "	mat4 " + outputs[i] + ";\n";
+					break;
+				default:
+					break;
+			}
+			if (expanded_output_ports[i]) {
+				switch (vsnode->get_output_port_type(i)) {
+					case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+						j += 2;
+					} break;
+					case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+						j += 3;
+					} break;
+					case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+						j += 4;
+					} break;
+					default:
+						break;
+				}
+			}
+		}
+	}
+
+	node_code += vsnode->generate_code(p_mode, (VisualShader::Type)p_type, p_node, inputs, outputs, p_for_preview);
+	if (!node_code.is_empty()) {
+		r_code += node_name;
+		r_code += node_code;
+	}
+
+	for (int i = 0; i < output_count; i++) {
+		if (expanded_output_ports[i]) {
+			switch (vsnode->get_output_port_type(i)) {
+				case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+					if (vsnode->is_output_port_connected(i + 1) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 1))) { // red-component
+						String r = "n_out" + itos(p_node) + "p" + itos(i + 1);
+						r_code += "	float " + r + " = n_out" + itos(p_node) + "p" + itos(i) + ".r;\n";
+						outputs[i + 1] = r;
+					}
+
+					if (vsnode->is_output_port_connected(i + 2) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 2))) { // green-component
+						String g = "n_out" + itos(p_node) + "p" + itos(i + 2);
+						r_code += "	float " + g + " = n_out" + itos(p_node) + "p" + itos(i) + ".g;\n";
+						outputs[i + 2] = g;
+					}
+
+					i += 2;
+				} break;
+				case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+					if (vsnode->is_output_port_connected(i + 1) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 1))) { // red-component
+						String r = "n_out" + itos(p_node) + "p" + itos(i + 1);
+						r_code += "	float " + r + " = n_out" + itos(p_node) + "p" + itos(i) + ".r;\n";
+						outputs[i + 1] = r;
+					}
+
+					if (vsnode->is_output_port_connected(i + 2) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 2))) { // green-component
+						String g = "n_out" + itos(p_node) + "p" + itos(i + 2);
+						r_code += "	float " + g + " = n_out" + itos(p_node) + "p" + itos(i) + ".g;\n";
+						outputs[i + 2] = g;
+					}
+
+					if (vsnode->is_output_port_connected(i + 3) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 3))) { // blue-component
+						String b = "n_out" + itos(p_node) + "p" + itos(i + 3);
+						r_code += "	float " + b + " = n_out" + itos(p_node) + "p" + itos(i) + ".b;\n";
+						outputs[i + 3] = b;
+					}
+
+					i += 3;
+				} break;
+				case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+					if (vsnode->is_output_port_connected(i + 1) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 1))) { // red-component
+						String r = "n_out" + itos(p_node) + "p" + itos(i + 1);
+						r_code += "	float " + r + " = n_out" + itos(p_node) + "p" + itos(i) + ".r;\n";
+						outputs[i + 1] = r;
+					}
+
+					if (vsnode->is_output_port_connected(i + 2) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 2))) { // green-component
+						String g = "n_out" + itos(p_node) + "p" + itos(i + 2);
+						r_code += "	float " + g + " = n_out" + itos(p_node) + "p" + itos(i) + ".g;\n";
+						outputs[i + 2] = g;
+					}
+
+					if (vsnode->is_output_port_connected(i + 3) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 3))) { // blue-component
+						String b = "n_out" + itos(p_node) + "p" + itos(i + 3);
+						r_code += "	float " + b + " = n_out" + itos(p_node) + "p" + itos(i) + ".b;\n";
+						outputs[i + 3] = b;
+					}
+
+					if (vsnode->is_output_port_connected(i + 4) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 4))) { // alpha-component
+						String a = "n_out" + itos(p_node) + "p" + itos(i + 4);
+						r_code += "	float " + a + " = n_out" + itos(p_node) + "p" + itos(i) + ".a;\n";
+						outputs[i + 4] = a;
+					}
+
+					i += 4;
+				} break;
+				default:
+					break;
+			}
+		}
+	}
+
+	if (!node_code.is_empty()) {
+		r_code += "\n\n";
+	}
+
+	r_processed.insert(p_node);
+
+	return OK;
+}
+
+bool ShaderGraph::_check_reroute_subgraph(int p_target_port_type, int p_reroute_node, List<int> *r_visited_reroute_nodes) const {
+	// BFS to check whether connecting to the given subgraph (rooted at p_reroute_node) is valid.
+	List<int> queue;
+	queue.push_back(p_reroute_node);
+	if (r_visited_reroute_nodes != nullptr) {
+		r_visited_reroute_nodes->push_back(p_reroute_node);
+	}
+	while (!queue.is_empty()) {
+		int current_node_id = queue.front()->get();
+		ShaderGraph::Node current_node = nodes[current_node_id];
+		queue.pop_front();
+		for (const int &next_node_id : current_node.next_connected_nodes) {
+			Ref<VisualShaderNodeReroute> next_vsnode = nodes[next_node_id].node;
+			if (next_vsnode.is_valid()) {
+				queue.push_back(next_node_id);
+				if (r_visited_reroute_nodes != nullptr) {
+					r_visited_reroute_nodes->push_back(next_node_id);
+				}
+				continue;
+			}
+			// Check whether all ports connected with the reroute node are compatible.
+			for (const ShaderGraph::Connection &c : connections) {
+				VisualShaderNode::PortType to_port_type = nodes[next_node_id].node->get_input_port_type(c.to_port);
+				if (c.from_node == current_node_id &&
+						c.to_node == next_node_id &&
+						!is_port_types_compatible(p_target_port_type, to_port_type)) {
+					return false;
+				}
+			}
+		}
+	}
+	return true;
+}
+
+void ShaderGraph::add_node(const Ref<VisualShaderNode> &p_node, const Vector2 &p_position, int p_id) {
+	ERR_FAIL_COND(p_node.is_null());
+	ERR_FAIL_COND(p_id < 2); // Reserved for the output node.
+	ERR_FAIL_COND(nodes.has(p_id));
+
+	ShaderGraph::Node n;
+	n.node = p_node;
+	n.position = p_position;
+
+	Ref<VisualShaderNodeParameter> parameter = n.node;
+	if (parameter.is_valid()) {
+		String valid_name = validate_parameter_name(parameter->get_parameter_name(), parameter);
+		parameter->set_parameter_name(valid_name);
+	}
+
+	Ref<VisualShaderNodeCustom> custom = n.node;
+	if (custom.is_valid()) {
+		custom->update_ports();
+	}
+
+	nodes[p_id] = n;
+
+	n.node->connect_changed(callable_mp(this, &ShaderGraph::_node_changed));
+	emit_signal("graph_changed");
+}
+
+void ShaderGraph::set_node_position(int p_id, const Vector2 &p_position) {
+	ERR_FAIL_COND(!nodes.has(p_id));
+	nodes[p_id].position = p_position;
+}
+
+Vector2 ShaderGraph::get_node_position(int p_id) const {
+	ERR_FAIL_COND_V(!nodes.has(p_id), Vector2());
+	return nodes[p_id].position;
+}
+
+Ref<VisualShaderNode> ShaderGraph::get_node(int p_id) const {
+	if (!nodes.has(p_id)) {
+		return Ref<VisualShaderNode>();
+	}
+	ERR_FAIL_COND_V(!nodes.has(p_id), Ref<VisualShaderNode>());
+	return nodes[p_id].node;
+}
+
+Vector<int> ShaderGraph::get_node_ids() const {
+	Vector<int> ret;
+	for (const KeyValue<int, ShaderGraph::Node> &E : nodes) {
+		ret.push_back(E.key);
+	}
+
+	return ret;
+}
+
+int ShaderGraph::get_valid_node_id() const {
+	return nodes.size() ? MAX(2, nodes.back()->key() + 1) : 2;
+}
+
+int ShaderGraph::find_node_id(const Ref<VisualShaderNode> &p_node) const {
+	for (const KeyValue<int, ShaderGraph::Node> &E : nodes) {
+		if (E.value.node == p_node) {
+			return E.key;
+		}
+	}
+
+	return NODE_ID_INVALID;
+}
+
+void ShaderGraph::remove_node(int p_id) {
+	ERR_FAIL_COND(!nodes.has(p_id));
+
+	nodes.erase(p_id);
+
+	for (List<ShaderGraph::Connection>::Element *E = connections.front(); E;) {
+		List<ShaderGraph::Connection>::Element *N = E->next();
+		const ShaderGraph::Connection &connection = E->get();
+		if (connection.from_node == p_id || connection.to_node == p_id) {
+			if (connection.from_node == p_id) {
+				nodes[connection.to_node].prev_connected_nodes.erase(p_id);
+				nodes[connection.to_node].node->set_input_port_connected(connection.to_port, false);
+			} else if (connection.to_node == p_id) {
+				nodes[connection.from_node].next_connected_nodes.erase(p_id);
+				nodes[connection.from_node].node->set_output_port_connected(connection.from_port, false);
+			}
+			connections.erase(E);
+		}
+		E = N;
+	}
+
+	emit_signal("graph_changed");
+}
+
+void ShaderGraph::replace_node(int p_id, const StringName &p_new_class) {
+	ERR_FAIL_COND(!nodes.has(p_id));
+
+	if (nodes[p_id].node->get_class_name() == p_new_class) {
+		return;
+	}
+	VisualShaderNode *vsn = Object::cast_to<VisualShaderNode>(ClassDB::instantiate(p_new_class));
+	VisualShaderNode *prev_vsn = nodes[p_id].node.ptr();
+
+	// Update connection data.
+	for (int i = 0; i < vsn->get_output_port_count(); i++) {
+		if (i < prev_vsn->get_output_port_count()) {
+			if (prev_vsn->is_output_port_connected(i)) {
+				vsn->set_output_port_connected(i, true);
+			}
+
+			if (prev_vsn->is_output_port_expandable(i) && prev_vsn->_is_output_port_expanded(i) && vsn->is_output_port_expandable(i)) {
+				vsn->_set_output_port_expanded(i, true);
+
+				int component_count = 0;
+				switch (prev_vsn->get_output_port_type(i)) {
+					case VisualShaderNode::PORT_TYPE_VECTOR_2D:
+						component_count = 2;
+						break;
+					case VisualShaderNode::PORT_TYPE_VECTOR_3D:
+						component_count = 3;
+						break;
+					case VisualShaderNode::PORT_TYPE_VECTOR_4D:
+						component_count = 4;
+						break;
+					default:
+						break;
+				}
+
+				for (int j = 0; j < component_count; j++) {
+					int sub_port = i + 1 + j;
+
+					if (prev_vsn->is_output_port_connected(sub_port)) {
+						vsn->set_output_port_connected(sub_port, true);
+					}
+				}
+
+				i += component_count;
+			}
+		} else {
+			break;
+		}
+	}
+
+	nodes[p_id].node = Ref<VisualShaderNode>(vsn);
+
+	emit_signal("graph_changed");
+}
+
+bool ShaderGraph::are_nodes_connected(int p_from_node, int p_from_port, int p_to_node, int p_to_port) const {
+	for (const ShaderGraph::Connection &E : connections) {
+		if (E.from_node == p_from_node && E.from_port == p_from_port && E.to_node == p_to_node && E.to_port == p_to_port) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
+bool ShaderGraph::is_nodes_connected_relatively(int p_node, int p_target) const {
+	bool result = false;
+
+	const ShaderGraph::Node &node = nodes[p_node];
+
+	for (const int &E : node.prev_connected_nodes) {
+		if (E == p_target) {
+			return true;
+		}
+
+		result = is_nodes_connected_relatively(E, p_target);
+		if (result) {
+			break;
+		}
+	}
+	return result;
+}
+
+bool ShaderGraph::can_connect_nodes(int p_from_node, int p_from_port, int p_to_node, int p_to_port) const {
+	if (!nodes.has(p_from_node)) {
+		return false;
+	}
+
+	if (p_from_node == p_to_node) {
+		return false;
+	}
+
+	if (p_from_port < 0 || p_from_port >= nodes[p_from_node].node->get_expanded_output_port_count()) {
+		return false;
+	}
+
+	if (!nodes.has(p_to_node)) {
+		return false;
+	}
+
+	if (p_to_port < 0 || p_to_port >= nodes[p_to_node].node->get_input_port_count()) {
+		return false;
+	}
+
+	VisualShaderNode::PortType from_port_type = nodes[p_from_node].node->get_output_port_type(p_from_port);
+	VisualShaderNode::PortType to_port_type = nodes[p_to_node].node->get_input_port_type(p_to_port);
+
+	Ref<VisualShaderNodeReroute> to_node_reroute = nodes[p_to_node].node;
+	if (to_node_reroute.is_valid()) {
 		if (!_check_reroute_subgraph(from_port_type, p_to_node)) {
 			return false;
 		}
@@ -511,7 +1099,7 @@ Error ShaderGraph::connect_nodes(int p_from_node, int p_from_port, int p_to_node
 }
 
 void ShaderGraph::disconnect_nodes(int p_from_node, int p_from_port, int p_to_node, int p_to_port) {
-	for (const List<ShaderGraph::Connection>::Element *E = connections.front(); E; E = E->next()) {
+	for (List<ShaderGraph::Connection>::Element *E = connections.front(); E; E = E->next()) {
 		if (E->get().from_node == p_from_node && E->get().from_port == p_from_port && E->get().to_node == p_to_node && E->get().to_port == p_to_port) {
 			connections.erase(E);
 			nodes[p_from_node].next_connected_nodes.erase(p_to_node);
@@ -526,9 +1114,11 @@ void ShaderGraph::disconnect_nodes(int p_from_node, int p_from_port, int p_to_no
 
 void ShaderGraph::connect_nodes_forced(int p_from_node, int p_from_port, int p_to_node, int p_to_port) {
 	ERR_FAIL_COND(!nodes.has(p_from_node));
-	ERR_FAIL_INDEX(p_from_port, nodes[p_from_node].node->get_expanded_output_port_count());
+	// ERR_FAIL_INDEX(p_from_port, nodes[p_from_node].node->get_expanded_output_port_count());
 	ERR_FAIL_COND(!nodes.has(p_to_node));
-	ERR_FAIL_INDEX(p_to_port, nodes[p_to_node].node->get_input_port_count());
+	// ERR_FAIL_INDEX(p_to_port, nodes[p_to_node].node->get_input_port_count());
+	// TODO: The above two checks need to be disabled because the group input/output nodes won't have their group set until the whole graph is loaded.
+	// TODO: A solution would be to cache the input/output ports in the group input/output nodes.
 
 	for (const ShaderGraph::Connection &E : connections) {
 		if (E.from_node == p_from_node && E.from_port == p_from_port && E.to_node == p_to_node && E.to_port == p_to_port) {
@@ -662,6 +1252,32 @@ String ShaderGraph::validate_parameter_name(const String &p_name, const Ref<Visu
 	return String();
 }
 
+String VisualShaderNode::port_type_to_shader_string(PortType p_type) {
+	switch (p_type) {
+		case PORT_TYPE_SCALAR:
+			return "float";
+		case PORT_TYPE_SCALAR_INT:
+			return "int";
+		case PORT_TYPE_SCALAR_UINT:
+			return "uint";
+		case PORT_TYPE_VECTOR_2D:
+			return "vec2";
+		case PORT_TYPE_VECTOR_3D:
+			return "vec3";
+		case PORT_TYPE_VECTOR_4D:
+			return "vec4";
+		case PORT_TYPE_BOOLEAN:
+			return "bool";
+		case PORT_TYPE_TRANSFORM:
+			return "mat4";
+		case PORT_TYPE_SAMPLER:
+			return "sampler2D";
+		case PORT_TYPE_MAX:
+		default:
+			ERR_FAIL_V_MSG("", "Invalid port type.");
+	}
+}
+
 bool VisualShaderNode::is_simple_decl() const {
 	return simple_decl;
 }
@@ -1638,1156 +2254,612 @@ bool VisualShader::can_connect_nodes(Type p_type, int p_from_node, int p_from_po
 	return g->can_connect_nodes(p_from_node, p_from_port, p_to_node, p_to_port);
 }
 
-bool VisualShader::is_port_types_compatible(int p_a, int p_b) const {
-	const Ref<ShaderGraph> g = graph[0]; // Currently, this is independent of the type so we can use an arbitrary graph.
-	return g->is_port_types_compatible(p_a, p_b);
-}
-
-void VisualShader::attach_node_to_frame(Type p_type, int p_node, int p_frame) {
-	ERR_FAIL_INDEX(p_type, TYPE_MAX);
-	ERR_FAIL_COND(p_frame < 0);
-	Ref<ShaderGraph> g = graph[p_type];
-	g->attach_node_to_frame(p_node, p_frame);
-}
-
-void VisualShader::detach_node_from_frame(Type p_type, int p_node) {
-	ERR_FAIL_INDEX(p_type, TYPE_MAX);
-	Ref<ShaderGraph> g = graph[p_type];
-	g->detach_node_from_frame(p_node);
-}
-
-String VisualShader::get_reroute_parameter_name(Type p_type, int p_reroute_node) const {
-	ERR_FAIL_INDEX_V(p_type, TYPE_MAX, "");
-	const Ref<ShaderGraph> g = graph[p_type];
-	return g->get_reroute_parameter_name(p_reroute_node);
-}
-
-void VisualShader::connect_nodes_forced(Type p_type, int p_from_node, int p_from_port, int p_to_node, int p_to_port) {
-	ERR_FAIL_INDEX(p_type, TYPE_MAX);
-	Ref<ShaderGraph> g = graph[p_type];
-	g->connect_nodes_forced(p_from_node, p_from_port, p_to_node, p_to_port);
-	_queue_update();
-}
-
-Error VisualShader::connect_nodes(Type p_type, int p_from_node, int p_from_port, int p_to_node, int p_to_port) {
-	ERR_FAIL_INDEX_V(p_type, TYPE_MAX, ERR_CANT_CONNECT);
-	Ref<ShaderGraph> g = graph[p_type];
-	const Error error = g->connect_nodes(p_from_node, p_from_port, p_to_node, p_to_port);
-	_queue_update();
-	return error;
-}
-
-void VisualShader::disconnect_nodes(Type p_type, int p_from_node, int p_from_port, int p_to_node, int p_to_port) {
-	ERR_FAIL_INDEX(p_type, TYPE_MAX);
-	Ref<ShaderGraph> g = graph[p_type];
-	g->disconnect_nodes(p_from_node, p_from_port, p_to_node, p_to_port);
-	_queue_update();
-}
-
-TypedArray<Dictionary> VisualShader::_get_node_connections(Type p_type) const {
-	ERR_FAIL_INDEX_V(p_type, TYPE_MAX, Array());
-	const Ref<ShaderGraph> g = graph[p_type];
-
-	TypedArray<Dictionary> ret;
-	for (const ShaderGraph::Connection &E : g->connections) {
-		Dictionary d;
-		d["from_node"] = E.from_node;
-		d["from_port"] = E.from_port;
-		d["to_node"] = E.to_node;
-		d["to_port"] = E.to_port;
-		ret.push_back(d);
-	}
-
-	return ret;
-}
-
-void VisualShader::get_node_connections(Type p_type, List<ShaderGraph::Connection> *r_connections) const {
-	ERR_FAIL_INDEX(p_type, TYPE_MAX);
-	const Ref<ShaderGraph> g = graph[p_type];
-	g->get_node_connections(r_connections);
-}
-
-void VisualShader::set_mode(Mode p_mode) {
-	ERR_FAIL_INDEX_MSG(p_mode, Mode::MODE_MAX, vformat("Invalid shader mode: %d.", p_mode));
-
-	if (shader_mode == p_mode) {
-		return;
-	}
-
-	//erase input/output connections
-	modes.clear();
-	flags.clear();
-	shader_mode = p_mode;
-	for (int i = 0; i < TYPE_MAX; i++) {
-		for (KeyValue<int, ShaderGraph::Node> &E : graph[i]->nodes) {
-			Ref<VisualShaderNodeInput> input = E.value.node;
-			if (input.is_valid()) {
-				input->shader_mode = shader_mode;
-				//input->input_index = 0;
-			}
-		}
-
-		Ref<VisualShaderNodeOutput> output = graph[i]->nodes[ShaderGraph::NODE_ID_OUTPUT].node;
-		output->shader_mode = shader_mode;
-
-		// clear connections since they are no longer valid
-		for (List<ShaderGraph::Connection>::Element *E = graph[i]->connections.front(); E;) {
-			bool keep = true;
-
-			List<ShaderGraph::Connection>::Element *N = E->next();
-
-			int from = E->get().from_node;
-			int to = E->get().to_node;
-
-			if (!graph[i]->nodes.has(from)) {
-				keep = false;
-			} else {
-				Ref<VisualShaderNode> from_node = graph[i]->nodes[from].node;
-				if (from_node->is_class("VisualShaderNodeOutput") || from_node->is_class("VisualShaderNodeInput")) {
-					keep = false;
-				}
-			}
-
-			if (!graph[i]->nodes.has(to)) {
-				keep = false;
-			} else {
-				Ref<VisualShaderNode> to_node = graph[i]->nodes[to].node;
-				if (to_node->is_class("VisualShaderNodeOutput") || to_node->is_class("VisualShaderNodeInput")) {
-					keep = false;
-				}
-			}
-
-			if (!keep) {
-				graph[i]->connections.erase(E);
-			}
-			E = N;
-		}
-	}
-
-	_queue_update();
-	notify_property_list_changed();
-}
-
-Shader::Mode VisualShader::get_mode() const {
-	return shader_mode;
-}
-
-bool VisualShader::is_text_shader() const {
-	return false;
-}
-
-String VisualShader::generate_preview_shader(Type p_type, int p_node, int p_port, Vector<ShaderGraph::DefaultTextureParam> &default_tex_params) const {
-	Ref<VisualShaderNode> node = get_node(p_type, p_node);
-	ERR_FAIL_COND_V(!node.is_valid(), String());
-	ERR_FAIL_COND_V(p_port < 0 || p_port >= node->get_expanded_output_port_count(), String());
-	ERR_FAIL_COND_V(node->get_output_port_type(p_port) == VisualShaderNode::PORT_TYPE_TRANSFORM, String());
-
-	StringBuilder global_code;
-	StringBuilder global_code_per_node;
-	HashMap<Type, StringBuilder> global_code_per_func;
-	StringBuilder shader_code;
-	HashSet<StringName> classes;
-
-	global_code += String() + "shader_type canvas_item;\n";
-
-	String global_expressions;
-	for (int i = 0, index = 0; i < TYPE_MAX; i++) {
-		for (const KeyValue<int, ShaderGraph::Node> &E : graph[i]->nodes) {
-			Ref<VisualShaderNodeGlobalExpression> global_expression = E.value.node;
-			if (global_expression.is_valid()) {
-				String expr = "";
-				expr += "// " + global_expression->get_caption() + ":" + itos(index++) + "\n";
-				expr += global_expression->generate_global(get_mode(), Type(i), -1);
-				expr = expr.replace("\n", "\n	");
-				expr += "\n";
-				global_expressions += expr;
-			}
-		}
-	}
-
-	global_code += "\n";
-	global_code += global_expressions;
-
-	//make it faster to go around through shader
-	VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> input_connections;
-	VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> output_connections;
-
-	for (const List<ShaderGraph::Connection>::Element *E = graph[p_type]->connections.front(); E; E = E->next()) {
-		ConnectionKey from_key;
-		from_key.node = E->get().from_node;
-		from_key.port = E->get().from_port;
-
-		output_connections.insert(from_key, E);
-
-		ConnectionKey to_key;
-		to_key.node = E->get().to_node;
-		to_key.port = E->get().to_port;
-
-		input_connections.insert(to_key, E);
-	}
-
-	shader_code += "\nvoid fragment() {\n";
-
-	HashSet<int> processed;
-	Error err = _write_node(p_type, &global_code, &global_code_per_node, &global_code_per_func, shader_code, default_tex_params, input_connections, output_connections, p_node, processed, true, classes);
-	ERR_FAIL_COND_V(err != OK, String());
-
-	switch (node->get_output_port_type(p_port)) {
-		case VisualShaderNode::PORT_TYPE_SCALAR: {
-			shader_code += "	COLOR.rgb = vec3(n_out" + itos(p_node) + "p" + itos(p_port) + ");\n";
-		} break;
-		case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
-			shader_code += "	COLOR.rgb = vec3(float(n_out" + itos(p_node) + "p" + itos(p_port) + "));\n";
-		} break;
-		case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
-			shader_code += "	COLOR.rgb = vec3(float(n_out" + itos(p_node) + "p" + itos(p_port) + "));\n";
-		} break;
-		case VisualShaderNode::PORT_TYPE_BOOLEAN: {
-			shader_code += "	COLOR.rgb = vec3(n_out" + itos(p_node) + "p" + itos(p_port) + " ? 1.0 : 0.0);\n";
-		} break;
-		case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-			shader_code += "	COLOR.rgb = vec3(n_out" + itos(p_node) + "p" + itos(p_port) + ", 0.0);\n";
-		} break;
-		case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-			shader_code += "	COLOR.rgb = n_out" + itos(p_node) + "p" + itos(p_port) + ";\n";
-		} break;
-		case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-			shader_code += "	COLOR = n_out" + itos(p_node) + "p" + itos(p_port) + ";\n";
-		} break;
-		default: {
-			shader_code += "	COLOR.rgb = vec3(0.0);\n";
-		} break;
-	}
-
-	shader_code += "}\n";
-
-	//set code secretly
-	global_code += "\n\n";
-	String final_code = global_code;
-	final_code += global_code_per_node;
-	final_code += shader_code;
-	return final_code;
-}
-
-String VisualShader::validate_port_name(const String &p_port_name, VisualShaderNode *p_node, int p_port_id, bool p_output) const {
-	const Ref<ShaderGraph> g = graph[0];
-	return g->validate_port_name(p_port_name, p_node, p_port_id, p_output);
+bool VisualShader::is_port_types_compatible(int p_a, int p_b) const {
+	const Ref<ShaderGraph> g = graph[0]; // Currently, this is independent of the type so we can use an arbitrary graph.
+	return g->is_port_types_compatible(p_a, p_b);
 }
 
-String VisualShader::validate_parameter_name(const String &p_name, const Ref<VisualShaderNodeParameter> &p_parameter) const {
-	String param_name = p_name; //validate name first
-	while (param_name.length() && !is_ascii_alphabet_char(param_name[0])) {
-		param_name = param_name.substr(1, param_name.length() - 1);
-	}
-	if (!param_name.is_empty()) {
-		String valid_name;
-
-		for (int i = 0; i < param_name.length(); i++) {
-			if (is_ascii_identifier_char(param_name[i])) {
-				valid_name += String::chr(param_name[i]);
-			} else if (param_name[i] == ' ') {
-				valid_name += "_";
-			}
-		}
-
-		param_name = valid_name;
-	}
+void VisualShader::attach_node_to_frame(Type p_type, int p_node, int p_frame) {
+	ERR_FAIL_INDEX(p_type, TYPE_MAX);
+	ERR_FAIL_COND(p_frame < 0);
+	Ref<ShaderGraph> g = graph[p_type];
+	g->attach_node_to_frame(p_node, p_frame);
+}
 
-	if (param_name.is_empty()) {
-		param_name = p_parameter->get_caption();
-	}
+void VisualShader::detach_node_from_frame(Type p_type, int p_node) {
+	ERR_FAIL_INDEX(p_type, TYPE_MAX);
+	Ref<ShaderGraph> g = graph[p_type];
+	g->detach_node_from_frame(p_node);
+}
 
-	int attempt = 1;
+String VisualShader::get_reroute_parameter_name(Type p_type, int p_reroute_node) const {
+	ERR_FAIL_INDEX_V(p_type, TYPE_MAX, "");
+	const Ref<ShaderGraph> g = graph[p_type];
+	return g->get_reroute_parameter_name(p_reroute_node);
+}
 
-	while (true) {
-		bool exists = false;
-		for (int i = 0; i < TYPE_MAX; i++) {
-			for (const KeyValue<int, ShaderGraph::Node> &E : graph[i]->nodes) {
-				Ref<VisualShaderNodeParameter> node = E.value.node;
-				if (node == p_parameter) { //do not test on self
-					continue;
-				}
-				if (node.is_valid() && node->get_parameter_name() == param_name) {
-					exists = true;
-					break;
-				}
-			}
-			if (exists) {
-				break;
-			}
-		}
+void VisualShader::connect_nodes_forced(Type p_type, int p_from_node, int p_from_port, int p_to_node, int p_to_port) {
+	ERR_FAIL_INDEX(p_type, TYPE_MAX);
+	Ref<ShaderGraph> g = graph[p_type];
+	g->connect_nodes_forced(p_from_node, p_from_port, p_to_node, p_to_port);
+	_queue_update();
+}
 
-		if (exists) {
-			//remove numbers, put new and try again
-			attempt++;
-			while (param_name.length() && is_digit(param_name[param_name.length() - 1])) {
-				param_name = param_name.substr(0, param_name.length() - 1);
-			}
-			ERR_FAIL_COND_V(param_name.is_empty(), String());
-			param_name += itos(attempt);
-		} else {
-			break;
-		}
-	}
+Error VisualShader::connect_nodes(Type p_type, int p_from_node, int p_from_port, int p_to_node, int p_to_port) {
+	ERR_FAIL_INDEX_V(p_type, TYPE_MAX, ERR_CANT_CONNECT);
+	Ref<ShaderGraph> g = graph[p_type];
+	const Error error = g->connect_nodes(p_from_node, p_from_port, p_to_node, p_to_port);
+	_queue_update();
+	return error;
+}
 
-	return param_name;
+void VisualShader::disconnect_nodes(Type p_type, int p_from_node, int p_from_port, int p_to_node, int p_to_port) {
+	ERR_FAIL_INDEX(p_type, TYPE_MAX);
+	Ref<ShaderGraph> g = graph[p_type];
+	g->disconnect_nodes(p_from_node, p_from_port, p_to_node, p_to_port);
+	_queue_update();
 }
 
-static const char *type_string[VisualShader::TYPE_MAX] = {
-	"vertex",
-	"fragment",
-	"light",
-	"start",
-	"process",
-	"collide",
-	"start_custom",
-	"process_custom",
-	"sky",
-	"fog",
-};
+TypedArray<Dictionary> VisualShader::_get_node_connections(Type p_type) const {
+	ERR_FAIL_INDEX_V(p_type, TYPE_MAX, Array());
+	const Ref<ShaderGraph> g = graph[p_type];
 
-bool VisualShader::_set(const StringName &p_name, const Variant &p_value) {
-	String prop_name = p_name;
-	if (prop_name == "mode") {
-		set_mode(Shader::Mode(int(p_value)));
-		return true;
-	} else if (prop_name.begins_with("flags/")) {
-		StringName flag = prop_name.get_slicec('/', 1);
-		bool enable = p_value;
-		if (enable) {
-			flags.insert(flag);
-		} else {
-			flags.erase(flag);
-		}
-		_queue_update();
-		return true;
-	} else if (prop_name.begins_with("modes/")) {
-		String mode_name = prop_name.get_slicec('/', 1);
-		int value = p_value;
-		if (value == 0) {
-			modes.erase(mode_name); //means it's default anyway, so don't store it
-		} else {
-			modes[mode_name] = value;
-		}
-		_queue_update();
-		return true;
-	} else if (prop_name.begins_with("varyings/")) {
-		String var_name = prop_name.get_slicec('/', 1);
-		Varying value = Varying();
-		value.name = var_name;
-		if (value.from_string(p_value) && !varyings.has(var_name)) {
-			varyings[var_name] = value;
-			varyings_list.push_back(value);
-		}
-		_queue_update();
-		return true;
-	}
-#ifdef TOOLS_ENABLED
-	else if (prop_name.begins_with("preview_params/") && Engine::get_singleton()->is_editor_hint()) {
-		String param_name = prop_name.get_slicec('/', 1);
-		Variant value = VariantUtilityFunctions::str_to_var(p_value);
-		preview_params[param_name] = value;
-		return true;
+	TypedArray<Dictionary> ret;
+	for (const ShaderGraph::Connection &E : g->connections) {
+		Dictionary d;
+		d["from_node"] = E.from_node;
+		d["from_port"] = E.from_port;
+		d["to_node"] = E.to_node;
+		d["to_port"] = E.to_port;
+		ret.push_back(d);
 	}
-#endif
-	else if (prop_name.begins_with("nodes/")) {
-		String typestr = prop_name.get_slicec('/', 1);
-		Type type = TYPE_VERTEX;
-		for (int i = 0; i < TYPE_MAX; i++) {
-			if (typestr == type_string[i]) {
-				type = Type(i);
-				break;
-			}
-		}
-
-		String index = prop_name.get_slicec('/', 2);
-		if (index == "connections") {
-			Vector<int> conns = p_value;
-			if (conns.size() % 4 == 0) {
-				for (int i = 0; i < conns.size(); i += 4) {
-					connect_nodes_forced(type, conns[i + 0], conns[i + 1], conns[i + 2], conns[i + 3]);
-				}
-			}
-			return true;
-		}
 
-		int id = index.to_int();
-		String what = prop_name.get_slicec('/', 3);
+	return ret;
+}
 
-		if (what == "node") {
-			add_node(type, p_value, Vector2(), id);
-			return true;
-		} else if (what == "position") {
-			set_node_position(type, id, p_value);
-			return true;
-		} else if (what == "size") {
-			VisualShaderNodeResizableBase *resizable_vn = Object::cast_to<VisualShaderNodeResizableBase>(get_node(type, id).ptr());
-			if (resizable_vn) {
-				resizable_vn->set_size(p_value);
-				return true;
-			}
-		} else if (what == "input_ports") {
-			VisualShaderNodeGroupBase *group_vn = Object::cast_to<VisualShaderNodeGroupBase>(get_node(type, id).ptr());
-			if (group_vn) {
-				group_vn->set_inputs(p_value);
-				return true;
-			}
-		} else if (what == "output_ports") {
-			VisualShaderNodeGroupBase *group_vn = Object::cast_to<VisualShaderNodeGroupBase>(get_node(type, id).ptr());
-			if (group_vn) {
-				group_vn->set_outputs(p_value);
-				return true;
-			}
-		} else if (what == "expression") {
-			VisualShaderNodeExpression *expression_vn = Object::cast_to<VisualShaderNodeExpression>(get_node(type, id).ptr());
-			if (expression_vn) {
-				expression_vn->set_expression(p_value);
-				return true;
-			}
-		}
-	}
-	return false;
+void VisualShader::get_node_connections(Type p_type, List<ShaderGraph::Connection> *r_connections) const {
+	ERR_FAIL_INDEX(p_type, TYPE_MAX);
+	const Ref<ShaderGraph> g = graph[p_type];
+	g->get_node_connections(r_connections);
 }
 
-bool VisualShader::_get(const StringName &p_name, Variant &r_ret) const {
-	String prop_name = p_name;
-	if (prop_name == "mode") {
-		r_ret = get_mode();
-		return true;
-	} else if (prop_name.begins_with("flags/")) {
-		StringName flag = prop_name.get_slicec('/', 1);
-		r_ret = flags.has(flag);
-		return true;
-	} else if (prop_name.begins_with("modes/")) {
-		String mode_name = prop_name.get_slicec('/', 1);
-		if (modes.has(mode_name)) {
-			r_ret = modes[mode_name];
-		} else {
-			r_ret = 0;
-		}
-		return true;
-	} else if (prop_name.begins_with("varyings/")) {
-		String var_name = prop_name.get_slicec('/', 1);
-		if (varyings.has(var_name)) {
-			r_ret = varyings[var_name].to_string();
-		} else {
-			r_ret = String();
-		}
-		return true;
-	}
-#ifdef TOOLS_ENABLED
-	else if (prop_name.begins_with("preview_params/") && Engine::get_singleton()->is_editor_hint()) {
-		String param_name = prop_name.get_slicec('/', 1);
-		if (preview_params.has(param_name)) {
-			r_ret = VariantUtilityFunctions::var_to_str(preview_params[param_name]);
-		} else {
-			r_ret = String();
-		}
-		return true;
+void VisualShader::set_mode(Mode p_mode) {
+	ERR_FAIL_INDEX_MSG(p_mode, Mode::MODE_MAX, vformat("Invalid shader mode: %d.", p_mode));
+
+	if (shader_mode == p_mode) {
+		return;
 	}
-#endif // TOOLS_ENABLED
-	else if (prop_name.begins_with("nodes/")) {
-		String typestr = prop_name.get_slicec('/', 1);
-		Type type = TYPE_VERTEX;
-		for (int i = 0; i < TYPE_MAX; i++) {
-			if (typestr == type_string[i]) {
-				type = Type(i);
-				break;
+
+	//erase input/output connections
+	modes.clear();
+	flags.clear();
+	shader_mode = p_mode;
+	for (int i = 0; i < TYPE_MAX; i++) {
+		for (KeyValue<int, ShaderGraph::Node> &E : graph[i]->nodes) {
+			Ref<VisualShaderNodeInput> input = E.value.node;
+			if (input.is_valid()) {
+				input->shader_mode = shader_mode;
+				//input->input_index = 0;
 			}
 		}
 
-		String index = prop_name.get_slicec('/', 2);
-		if (index == "connections") {
-			Vector<int> conns;
-			for (const ShaderGraph::Connection &E : graph[type]->connections) {
-				conns.push_back(E.from_node);
-				conns.push_back(E.from_port);
-				conns.push_back(E.to_node);
-				conns.push_back(E.to_port);
-			}
+		Ref<VisualShaderNodeOutput> output = graph[i]->nodes[ShaderGraph::NODE_ID_OUTPUT].node;
+		output->shader_mode = shader_mode;
 
-			r_ret = conns;
-			return true;
-		}
+		// clear connections since they are no longer valid
+		for (List<ShaderGraph::Connection>::Element *E = graph[i]->connections.front(); E;) {
+			bool keep = true;
 
-		int id = index.to_int();
-		String what = prop_name.get_slicec('/', 3);
+			List<ShaderGraph::Connection>::Element *N = E->next();
 
-		if (what == "node") {
-			r_ret = get_node(type, id);
-			return true;
-		} else if (what == "position") {
-			r_ret = get_node_position(type, id);
-			return true;
-		} else if (what == "size") {
-			VisualShaderNodeResizableBase *resizable_vn = Object::cast_to<VisualShaderNodeResizableBase>(get_node(type, id).ptr());
-			if (resizable_vn) {
-				r_ret = resizable_vn->get_size();
-				return true;
-			}
-		} else if (what == "input_ports") {
-			VisualShaderNodeGroupBase *group_vn = Object::cast_to<VisualShaderNodeGroupBase>(get_node(type, id).ptr());
-			if (group_vn) {
-				r_ret = group_vn->get_inputs();
-				return true;
+			int from = E->get().from_node;
+			int to = E->get().to_node;
+
+			if (!graph[i]->nodes.has(from)) {
+				keep = false;
+			} else {
+				Ref<VisualShaderNode> from_node = graph[i]->nodes[from].node;
+				if (from_node->is_class("VisualShaderNodeOutput") || from_node->is_class("VisualShaderNodeInput")) {
+					keep = false;
+				}
 			}
-		} else if (what == "output_ports") {
-			VisualShaderNodeGroupBase *group_vn = Object::cast_to<VisualShaderNodeGroupBase>(get_node(type, id).ptr());
-			if (group_vn) {
-				r_ret = group_vn->get_outputs();
-				return true;
+
+			if (!graph[i]->nodes.has(to)) {
+				keep = false;
+			} else {
+				Ref<VisualShaderNode> to_node = graph[i]->nodes[to].node;
+				if (to_node->is_class("VisualShaderNodeOutput") || to_node->is_class("VisualShaderNodeInput")) {
+					keep = false;
+				}
 			}
-		} else if (what == "expression") {
-			VisualShaderNodeExpression *expression_vn = Object::cast_to<VisualShaderNodeExpression>(get_node(type, id).ptr());
-			if (expression_vn) {
-				r_ret = expression_vn->get_expression();
-				return true;
+
+			if (!keep) {
+				graph[i]->connections.erase(E);
 			}
+			E = N;
 		}
 	}
-	return false;
-}
 
-void VisualShader::reset_state() {
-	// TODO: Everything needs to be cleared here. Evaluate this or implement it.
-	emit_changed();
+	_queue_update();
+	notify_property_list_changed();
 }
 
-void VisualShader::_get_property_list(List<PropertyInfo> *p_list) const {
-	//mode
-	p_list->push_back(PropertyInfo(Variant::INT, PNAME("mode"), PROPERTY_HINT_ENUM, "Spatial,CanvasItem,Particles,Sky,Fog"));
-	//render modes
-
-	HashMap<String, String> blend_mode_enums;
-	HashSet<String> toggles;
+Shader::Mode VisualShader::get_mode() const {
+	return shader_mode;
+}
 
-	const Vector<ShaderLanguage::ModeInfo> &rmodes = ShaderTypes::get_singleton()->get_modes(RenderingServer::ShaderMode(shader_mode));
+bool VisualShader::is_text_shader() const {
+	return false;
+}
 
-	for (int i = 0; i < rmodes.size(); i++) {
-		const ShaderLanguage::ModeInfo &info = rmodes[i];
+String VisualShader::generate_preview_shader(Type p_type, int p_node, int p_port, Vector<ShaderGraph::DefaultTextureParam> &default_tex_params) const {
+	Ref<VisualShaderNode> node = get_node(p_type, p_node);
+	ERR_FAIL_COND_V(!node.is_valid(), String());
+	ERR_FAIL_COND_V(p_port < 0 || p_port >= node->get_expanded_output_port_count(), String());
+	ERR_FAIL_COND_V(node->get_output_port_type(p_port) == VisualShaderNode::PORT_TYPE_TRANSFORM, String());
 
-		if (!info.options.is_empty()) {
-			const String begin = String(info.name);
+	StringBuilder global_code;
+	StringBuilder global_code_per_node;
+	HashMap<ShaderGraph::Type, StringBuilder> global_code_per_func;
+	StringBuilder shader_code;
+	HashSet<StringName> classes;
 
-			for (int j = 0; j < info.options.size(); j++) {
-				const String option = String(info.options[j]).capitalize();
+	global_code += String() + "shader_type canvas_item;\n";
 
-				if (!blend_mode_enums.has(begin)) {
-					blend_mode_enums[begin] = option;
-				} else {
-					blend_mode_enums[begin] += "," + option;
-				}
+	String global_expressions;
+	for (int i = 0, index = 0; i < TYPE_MAX; i++) {
+		for (const KeyValue<int, ShaderGraph::Node> &E : graph[i]->nodes) {
+			Ref<VisualShaderNodeGlobalExpression> global_expression = E.value.node;
+			if (global_expression.is_valid()) {
+				String expr = "";
+				expr += "// " + global_expression->get_caption() + ":" + itos(index++) + "\n";
+				expr += global_expression->generate_global(get_mode(), Type(i), -1);
+				expr = expr.replace("\n", "\n	");
+				expr += "\n";
+				global_expressions += expr;
 			}
-		} else {
-			toggles.insert(String(info.name));
 		}
 	}
 
-	for (const KeyValue<String, String> &E : blend_mode_enums) {
-		p_list->push_back(PropertyInfo(Variant::INT, vformat("%s/%s", PNAME("modes"), E.key), PROPERTY_HINT_ENUM, E.value));
-	}
+	global_code += "\n";
+	global_code += global_expressions;
 
-	for (const String &E : toggles) {
-		p_list->push_back(PropertyInfo(Variant::BOOL, vformat("%s/%s", PNAME("flags"), E)));
-	}
+	//make it faster to go around through shader
+	VMap<ShaderGraph::ConnectionKey, const List<ShaderGraph::Connection>::Element *> input_connections;
+	VMap<ShaderGraph::ConnectionKey, const List<ShaderGraph::Connection>::Element *> output_connections;
 
-	for (const KeyValue<String, Varying> &E : varyings) {
-		p_list->push_back(PropertyInfo(Variant::STRING, vformat("%s/%s", "varyings", E.key), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
-	}
+	for (const List<ShaderGraph::Connection>::Element *E = graph[p_type]->connections.front(); E; E = E->next()) {
+		ShaderGraph::ConnectionKey from_key;
+		from_key.node = E->get().from_node;
+		from_key.port = E->get().from_port;
 
-#ifdef TOOLS_ENABLED
-	if (Engine::get_singleton()->is_editor_hint()) {
-		for (const KeyValue<String, Variant> &E : preview_params) {
-			p_list->push_back(PropertyInfo(Variant::STRING, vformat("%s/%s", "preview_params", E.key), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
-		}
+		output_connections.insert(from_key, E);
+
+		ShaderGraph::ConnectionKey to_key;
+		to_key.node = E->get().to_node;
+		to_key.port = E->get().to_port;
+
+		input_connections.insert(to_key, E);
 	}
-#endif // TOOLS_ENABLED
 
-	for (int i = 0; i < TYPE_MAX; i++) {
-		for (const KeyValue<int, ShaderGraph::Node> &E : graph[i]->nodes) {
-			String prop_name = "nodes/";
-			prop_name += type_string[i];
-			prop_name += "/" + itos(E.key);
+	shader_code += "\nvoid fragment() {\n";
 
-			if (E.key != ShaderGraph::NODE_ID_OUTPUT) {
-				p_list->push_back(PropertyInfo(Variant::OBJECT, prop_name + "/node", PROPERTY_HINT_RESOURCE_TYPE, "VisualShaderNode", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_ALWAYS_DUPLICATE));
-			}
-			p_list->push_back(PropertyInfo(Variant::VECTOR2, prop_name + "/position", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
+	HashSet<int> processed;
+	Error err = _write_node((ShaderGraph::Type)p_type, &global_code, &global_code_per_node, &global_code_per_func, shader_code, default_tex_params, input_connections, output_connections, p_node, processed, true, classes);
+	ERR_FAIL_COND_V(err != OK, String());
 
-			if (Object::cast_to<VisualShaderNodeGroupBase>(E.value.node.ptr()) != nullptr) {
-				p_list->push_back(PropertyInfo(Variant::VECTOR2, prop_name + "/size", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
-				p_list->push_back(PropertyInfo(Variant::STRING, prop_name + "/input_ports", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
-				p_list->push_back(PropertyInfo(Variant::STRING, prop_name + "/output_ports", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
-			}
-			if (Object::cast_to<VisualShaderNodeExpression>(E.value.node.ptr()) != nullptr) {
-				p_list->push_back(PropertyInfo(Variant::STRING, prop_name + "/expression", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
-			}
-		}
-		p_list->push_back(PropertyInfo(Variant::PACKED_INT32_ARRAY, "nodes/" + String(type_string[i]) + "/connections", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
+	switch (node->get_output_port_type(p_port)) {
+		case VisualShaderNode::PORT_TYPE_SCALAR: {
+			shader_code += "	COLOR.rgb = vec3(n_out" + itos(p_node) + "p" + itos(p_port) + ");\n";
+		} break;
+		case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
+			shader_code += "	COLOR.rgb = vec3(float(n_out" + itos(p_node) + "p" + itos(p_port) + "));\n";
+		} break;
+		case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
+			shader_code += "	COLOR.rgb = vec3(float(n_out" + itos(p_node) + "p" + itos(p_port) + "));\n";
+		} break;
+		case VisualShaderNode::PORT_TYPE_BOOLEAN: {
+			shader_code += "	COLOR.rgb = vec3(n_out" + itos(p_node) + "p" + itos(p_port) + " ? 1.0 : 0.0);\n";
+		} break;
+		case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
+			shader_code += "	COLOR.rgb = vec3(n_out" + itos(p_node) + "p" + itos(p_port) + ", 0.0);\n";
+		} break;
+		case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
+			shader_code += "	COLOR.rgb = n_out" + itos(p_node) + "p" + itos(p_port) + ";\n";
+		} break;
+		case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
+			shader_code += "	COLOR = n_out" + itos(p_node) + "p" + itos(p_port) + ";\n";
+		} break;
+		default: {
+			shader_code += "	COLOR.rgb = vec3(0.0);\n";
+		} break;
 	}
-}
 
-// TODO: Refactor (simplify, rename and change comment style)
-Error VisualShader::_write_node(Type type, StringBuilder *p_global_code, StringBuilder *p_global_code_per_node, HashMap<Type, StringBuilder> *p_global_code_per_func, StringBuilder &r_code, Vector<ShaderGraph::DefaultTextureParam> &r_def_tex_params, const VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> &p_input_connections, const VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> &p_output_connections, int p_node, HashSet<int> &r_processed, bool p_for_preview, HashSet<StringName> &r_classes) const {
-	const Ref<VisualShaderNode> vsnode = graph[type]->nodes[p_node].node;
+	shader_code += "}\n";
 
-	if (vsnode->is_disabled()) {
-		r_code += "// " + vsnode->get_caption() + ":" + itos(p_node) + "\n";
-		r_code += "	// Node is disabled and code is not generated.\n";
-		return OK;
-	}
+	//set code secretly
+	global_code += "\n\n";
+	String final_code = global_code;
+	final_code += global_code_per_node;
+	final_code += shader_code;
+	return final_code;
+}
 
-	//check inputs recursively first
-	int input_count = vsnode->get_input_port_count();
-	for (int i = 0; i < input_count; i++) {
-		ConnectionKey ck;
-		ck.node = p_node;
-		ck.port = i;
+String VisualShader::validate_port_name(const String &p_port_name, VisualShaderNode *p_node, int p_port_id, bool p_output) const {
+	const Ref<ShaderGraph> g = graph[0];
+	return g->validate_port_name(p_port_name, p_node, p_port_id, p_output);
+}
 
-		if (p_input_connections.has(ck)) {
-			int from_node = p_input_connections[ck]->get().from_node;
-			if (r_processed.has(from_node)) {
-				continue;
-			}
+String VisualShader::validate_parameter_name(const String &p_name, const Ref<VisualShaderNodeParameter> &p_parameter) const {
+	String param_name = p_name; //validate name first
+	while (param_name.length() && !is_ascii_alphabet_char(param_name[0])) {
+		param_name = param_name.substr(1, param_name.length() - 1);
+	}
+	if (!param_name.is_empty()) {
+		String valid_name;
 
-			Error err = _write_node(type, p_global_code, p_global_code_per_node, p_global_code_per_func, r_code, r_def_tex_params, p_input_connections, p_output_connections, from_node, r_processed, p_for_preview, r_classes);
-			if (err) {
-				return err;
+		for (int i = 0; i < param_name.length(); i++) {
+			if (is_ascii_identifier_char(param_name[i])) {
+				valid_name += String::chr(param_name[i]);
+			} else if (param_name[i] == ' ') {
+				valid_name += "_";
 			}
 		}
-	}
 
-	// then this node
+		param_name = valid_name;
+	}
 
-	Vector<ShaderGraph::DefaultTextureParam> params = vsnode->get_default_texture_parameters(type, p_node);
-	for (int i = 0; i < params.size(); i++) {
-		r_def_tex_params.push_back(params[i]);
+	if (param_name.is_empty()) {
+		param_name = p_parameter->get_caption();
 	}
 
-	Ref<VisualShaderNodeInput> input = vsnode;
-	bool skip_global = input.is_valid() && p_for_preview;
+	int attempt = 1;
 
-	if (!skip_global) {
-		Ref<VisualShaderNodeParameter> parameter = vsnode;
-		if (!parameter.is_valid() || !parameter->is_global_code_generated()) {
-			if (p_global_code) {
-				*p_global_code += vsnode->generate_global(get_mode(), type, p_node);
+	while (true) {
+		bool exists = false;
+		for (int i = 0; i < TYPE_MAX; i++) {
+			for (const KeyValue<int, ShaderGraph::Node> &E : graph[i]->nodes) {
+				Ref<VisualShaderNodeParameter> node = E.value.node;
+				if (node == p_parameter) { //do not test on self
+					continue;
+				}
+				if (node.is_valid() && node->get_parameter_name() == param_name) {
+					exists = true;
+					break;
+				}
+			}
+			if (exists) {
+				break;
 			}
 		}
 
-		String class_name = vsnode->get_class_name();
-		if (class_name == "VisualShaderNodeCustom") {
-			class_name = vsnode->get_script_instance()->get_script()->get_path();
-		}
-		if (!r_classes.has(class_name)) {
-			if (p_global_code_per_node) {
-				*p_global_code_per_node += vsnode->generate_global_per_node(get_mode(), p_node);
-			}
-			for (int i = 0; i < TYPE_MAX; i++) {
-				if (p_global_code_per_func) {
-					(*p_global_code_per_func)[Type(i)] += vsnode->generate_global_per_func(get_mode(), Type(i), p_node);
-				}
+		if (exists) {
+			//remove numbers, put new and try again
+			attempt++;
+			while (param_name.length() && is_digit(param_name[param_name.length() - 1])) {
+				param_name = param_name.substr(0, param_name.length() - 1);
 			}
-			r_classes.insert(class_name);
+			ERR_FAIL_COND_V(param_name.is_empty(), String());
+			param_name += itos(attempt);
+		} else {
+			break;
 		}
 	}
 
-	if (!vsnode->is_code_generated()) { // just generate globals and ignore locals
-		r_processed.insert(p_node);
-		return OK;
-	}
-
-	String node_name = "// " + vsnode->get_caption() + ":" + itos(p_node) + "\n";
-	String node_code;
-	Vector<String> input_vars;
-
-	input_vars.resize(vsnode->get_input_port_count());
-	String *inputs = input_vars.ptrw();
-
-	for (int i = 0; i < input_count; i++) {
-		ConnectionKey ck;
-		ck.node = p_node;
-		ck.port = i;
-
-		if (p_input_connections.has(ck)) {
-			//connected to something, use that output
-			int from_node = p_input_connections[ck]->get().from_node;
-
-			if (graph[type]->nodes[from_node].node->is_disabled()) {
-				continue;
-			}
-
-			int from_port = p_input_connections[ck]->get().from_port;
-
-			VisualShaderNode::PortType in_type = vsnode->get_input_port_type(i);
-			VisualShaderNode::PortType out_type = graph[type]->nodes[from_node].node->get_output_port_type(from_port);
+	return param_name;
+}
 
-			String src_var = "n_out" + itos(from_node) + "p" + itos(from_port);
+static const char *type_string[VisualShader::TYPE_MAX] = {
+	"vertex",
+	"fragment",
+	"light",
+	"start",
+	"process",
+	"collide",
+	"start_custom",
+	"process_custom",
+	"sky",
+	"fog",
+};
 
-			if (in_type == VisualShaderNode::PORT_TYPE_SAMPLER && out_type == VisualShaderNode::PORT_TYPE_SAMPLER) {
-				VisualShaderNode *ptr = const_cast<VisualShaderNode *>(graph[type]->nodes[from_node].node.ptr());
-				// FIXME: This needs to be refactored at some point.
-				if (ptr->has_method("get_input_real_name")) {
-					inputs[i] = ptr->call("get_input_real_name");
-				} else if (ptr->has_method("get_parameter_name")) {
-					inputs[i] = ptr->call("get_parameter_name");
-				} else {
-					Ref<VisualShaderNodeReroute> reroute = graph[type]->nodes[from_node].node;
-					if (reroute.is_valid()) {
-						inputs[i] = get_reroute_parameter_name(type, from_node);
-					} else {
-						inputs[i] = "";
-					}
-				}
-			} else if (in_type == out_type) {
-				inputs[i] = src_var;
-			} else {
-				switch (in_type) {
-					case VisualShaderNode::PORT_TYPE_SCALAR: {
-						switch (out_type) {
-							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
-								inputs[i] = "float(" + src_var + ")";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
-								inputs[i] = "float(" + src_var + ")";
-							} break;
-							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
-								inputs[i] = "(" + src_var + " ? 1.0 : 0.0)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-								inputs[i] = src_var + ".x";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-								inputs[i] = src_var + ".x";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-								inputs[i] = src_var + ".x";
-							} break;
-							default:
-								break;
-						}
-					} break;
-					case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
-						switch (out_type) {
-							case VisualShaderNode::PORT_TYPE_SCALAR: {
-								inputs[i] = "int(" + src_var + ")";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
-								inputs[i] = "int(" + src_var + ")";
-							} break;
-							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
-								inputs[i] = "(" + src_var + " ? 1 : 0)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-								inputs[i] = "int(" + src_var + ".x)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-								inputs[i] = "int(" + src_var + ".x)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-								inputs[i] = "int(" + src_var + ".x)";
-							} break;
-							default:
-								break;
-						}
-					} break;
-					case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
-						switch (out_type) {
-							case VisualShaderNode::PORT_TYPE_SCALAR: {
-								inputs[i] = "uint(" + src_var + ")";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
-								inputs[i] = "uint(" + src_var + ")";
-							} break;
-							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
-								inputs[i] = "(" + src_var + " ? 1u : 0u)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-								inputs[i] = "uint(" + src_var + ".x)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-								inputs[i] = "uint(" + src_var + ".x)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-								inputs[i] = "uint(" + src_var + ".x)";
-							} break;
-							default:
-								break;
-						}
-					} break;
-					case VisualShaderNode::PORT_TYPE_BOOLEAN: {
-						switch (out_type) {
-							case VisualShaderNode::PORT_TYPE_SCALAR: {
-								inputs[i] = src_var + " > 0.0 ? true : false";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
-								inputs[i] = src_var + " > 0 ? true : false";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
-								inputs[i] = src_var + " > 0u ? true : false";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-								inputs[i] = "all(bvec2(" + src_var + "))";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-								inputs[i] = "all(bvec3(" + src_var + "))";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-								inputs[i] = "all(bvec4(" + src_var + "))";
-							} break;
-							default:
-								break;
-						}
-					} break;
-					case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-						switch (out_type) {
-							case VisualShaderNode::PORT_TYPE_SCALAR: {
-								inputs[i] = "vec2(" + src_var + ")";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
-								inputs[i] = "vec2(float(" + src_var + "))";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
-								inputs[i] = "vec2(float(" + src_var + "))";
-							} break;
-							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
-								inputs[i] = "vec2(" + src_var + " ? 1.0 : 0.0)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_3D:
-							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-								inputs[i] = "vec2(" + src_var + ".xy)";
-							} break;
-							default:
-								break;
-						}
-					} break;
+bool VisualShader::_set(const StringName &p_name, const Variant &p_value) {
+	String prop_name = p_name;
+	if (prop_name == "mode") {
+		set_mode(Shader::Mode(int(p_value)));
+		return true;
+	} else if (prop_name.begins_with("flags/")) {
+		StringName flag = prop_name.get_slicec('/', 1);
+		bool enable = p_value;
+		if (enable) {
+			flags.insert(flag);
+		} else {
+			flags.erase(flag);
+		}
+		_queue_update();
+		return true;
+	} else if (prop_name.begins_with("modes/")) {
+		String mode_name = prop_name.get_slicec('/', 1);
+		int value = p_value;
+		if (value == 0) {
+			modes.erase(mode_name); //means it's default anyway, so don't store it
+		} else {
+			modes[mode_name] = value;
+		}
+		_queue_update();
+		return true;
+	} else if (prop_name.begins_with("varyings/")) {
+		String var_name = prop_name.get_slicec('/', 1);
+		Varying value = Varying();
+		value.name = var_name;
+		if (value.from_string(p_value) && !varyings.has(var_name)) {
+			varyings[var_name] = value;
+			varyings_list.push_back(value);
+		}
+		_queue_update();
+		return true;
+	}
+#ifdef TOOLS_ENABLED
+	else if (prop_name.begins_with("preview_params/") && Engine::get_singleton()->is_editor_hint()) {
+		String param_name = prop_name.get_slicec('/', 1);
+		Variant value = VariantUtilityFunctions::str_to_var(p_value);
+		preview_params[param_name] = value;
+		return true;
+	}
+#endif
+	else if (prop_name.begins_with("nodes/")) {
+		String typestr = prop_name.get_slicec('/', 1);
+		Type type = TYPE_VERTEX;
+		for (int i = 0; i < TYPE_MAX; i++) {
+			if (typestr == type_string[i]) {
+				type = Type(i);
+				break;
+			}
+		}
 
-					case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-						switch (out_type) {
-							case VisualShaderNode::PORT_TYPE_SCALAR: {
-								inputs[i] = "vec3(" + src_var + ")";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
-								inputs[i] = "vec3(float(" + src_var + "))";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
-								inputs[i] = "vec3(float(" + src_var + "))";
-							} break;
-							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
-								inputs[i] = "vec3(" + src_var + " ? 1.0 : 0.0)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-								inputs[i] = "vec3(" + src_var + ", 0.0)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-								inputs[i] = "vec3(" + src_var + ".xyz)";
-							} break;
-							default:
-								break;
-						}
-					} break;
-					case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-						switch (out_type) {
-							case VisualShaderNode::PORT_TYPE_SCALAR: {
-								inputs[i] = "vec4(" + src_var + ")";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_INT: {
-								inputs[i] = "vec4(float(" + src_var + "))";
-							} break;
-							case VisualShaderNode::PORT_TYPE_SCALAR_UINT: {
-								inputs[i] = "vec4(float(" + src_var + "))";
-							} break;
-							case VisualShaderNode::PORT_TYPE_BOOLEAN: {
-								inputs[i] = "vec4(" + src_var + " ? 1.0 : 0.0)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-								inputs[i] = "vec4(" + src_var + ", 0.0, 0.0)";
-							} break;
-							case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-								inputs[i] = "vec4(" + src_var + ", 0.0)";
-							} break;
-							default:
-								break;
-						}
-					} break;
-					default:
-						break;
+		String index = prop_name.get_slicec('/', 2);
+		if (index == "connections") {
+			Vector<int> conns = p_value;
+			if (conns.size() % 4 == 0) {
+				for (int i = 0; i < conns.size(); i += 4) {
+					connect_nodes_forced(type, conns[i + 0], conns[i + 1], conns[i + 2], conns[i + 3]);
 				}
 			}
+			return true;
+		}
+
+		int id = index.to_int();
+		String what = prop_name.get_slicec('/', 3);
+
+		if (what == "node") {
+			add_node(type, p_value, Vector2(), id);
+			return true;
+		} else if (what == "position") {
+			set_node_position(type, id, p_value);
+			return true;
+		} else if (what == "size") {
+			VisualShaderNodeResizableBase *resizable_vn = Object::cast_to<VisualShaderNodeResizableBase>(get_node(type, id).ptr());
+			if (resizable_vn) {
+				resizable_vn->set_size(p_value);
+				return true;
+			}
+		} else if (what == "input_ports") {
+			VisualShaderNodeGroupBase *group_vn = Object::cast_to<VisualShaderNodeGroupBase>(get_node(type, id).ptr());
+			if (group_vn) {
+				group_vn->set_inputs(p_value);
+				return true;
+			}
+		} else if (what == "output_ports") {
+			VisualShaderNodeGroupBase *group_vn = Object::cast_to<VisualShaderNodeGroupBase>(get_node(type, id).ptr());
+			if (group_vn) {
+				group_vn->set_outputs(p_value);
+				return true;
+			}
+		} else if (what == "expression") {
+			VisualShaderNodeExpression *expression_vn = Object::cast_to<VisualShaderNodeExpression>(get_node(type, id).ptr());
+			if (expression_vn) {
+				expression_vn->set_expression(p_value);
+				return true;
+			}
+		}
+	}
+	return false;
+}
+
+bool VisualShader::_get(const StringName &p_name, Variant &r_ret) const {
+	String prop_name = p_name;
+	if (prop_name == "mode") {
+		r_ret = get_mode();
+		return true;
+	} else if (prop_name.begins_with("flags/")) {
+		StringName flag = prop_name.get_slicec('/', 1);
+		r_ret = flags.has(flag);
+		return true;
+	} else if (prop_name.begins_with("modes/")) {
+		String mode_name = prop_name.get_slicec('/', 1);
+		if (modes.has(mode_name)) {
+			r_ret = modes[mode_name];
 		} else {
-			if (!vsnode->is_generate_input_var(i)) {
-				continue;
+			r_ret = 0;
+		}
+		return true;
+	} else if (prop_name.begins_with("varyings/")) {
+		String var_name = prop_name.get_slicec('/', 1);
+		if (varyings.has(var_name)) {
+			r_ret = varyings[var_name].to_string();
+		} else {
+			r_ret = String();
+		}
+		return true;
+	}
+#ifdef TOOLS_ENABLED
+	else if (prop_name.begins_with("preview_params/") && Engine::get_singleton()->is_editor_hint()) {
+		String param_name = prop_name.get_slicec('/', 1);
+		if (preview_params.has(param_name)) {
+			r_ret = VariantUtilityFunctions::var_to_str(preview_params[param_name]);
+		} else {
+			r_ret = String();
+		}
+		return true;
+	}
+#endif // TOOLS_ENABLED
+	else if (prop_name.begins_with("nodes/")) {
+		String typestr = prop_name.get_slicec('/', 1);
+		Type type = TYPE_VERTEX;
+		for (int i = 0; i < TYPE_MAX; i++) {
+			if (typestr == type_string[i]) {
+				type = Type(i);
+				break;
 			}
+		}
 
-			Variant defval = vsnode->get_input_port_default_value(i);
-			if (defval.get_type() == Variant::FLOAT) {
-				float val = defval;
-				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
-				node_code += "	float " + inputs[i] + " = " + vformat("%.5f", val) + ";\n";
-			} else if (defval.get_type() == Variant::INT) {
-				int val = defval;
-				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
-				if (vsnode->get_input_port_type(i) == VisualShaderNode::PORT_TYPE_SCALAR_UINT) {
-					node_code += "	uint " + inputs[i] + " = " + itos(val) + "u;\n";
-				} else {
-					node_code += "	int " + inputs[i] + " = " + itos(val) + ";\n";
-				}
-			} else if (defval.get_type() == Variant::BOOL) {
-				bool val = defval;
-				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
-				node_code += "	bool " + inputs[i] + " = " + (val ? "true" : "false") + ";\n";
-			} else if (defval.get_type() == Variant::VECTOR2) {
-				Vector2 val = defval;
-				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
-				node_code += "	vec2 " + inputs[i] + " = " + vformat("vec2(%.5f, %.5f);\n", val.x, val.y);
-			} else if (defval.get_type() == Variant::VECTOR3) {
-				Vector3 val = defval;
-				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
-				node_code += "	vec3 " + inputs[i] + " = " + vformat("vec3(%.5f, %.5f, %.5f);\n", val.x, val.y, val.z);
-			} else if (defval.get_type() == Variant::VECTOR4) {
-				Vector4 val = defval;
-				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
-				node_code += "	vec4 " + inputs[i] + " = " + vformat("vec4(%.5f, %.5f, %.5f, %.5f);\n", val.x, val.y, val.z, val.w);
-			} else if (defval.get_type() == Variant::QUATERNION) {
-				Quaternion val = defval;
-				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
-				node_code += "	vec4 " + inputs[i] + " = " + vformat("vec4(%.5f, %.5f, %.5f, %.5f);\n", val.x, val.y, val.z, val.w);
-			} else if (defval.get_type() == Variant::TRANSFORM3D) {
-				Transform3D val = defval;
-				val.basis.transpose();
-				inputs[i] = "n_in" + itos(p_node) + "p" + itos(i);
-				Array values;
-				for (int j = 0; j < 3; j++) {
-					values.push_back(val.basis[j].x);
-					values.push_back(val.basis[j].y);
-					values.push_back(val.basis[j].z);
-				}
-				values.push_back(val.origin.x);
-				values.push_back(val.origin.y);
-				values.push_back(val.origin.z);
-				bool err = false;
-				node_code += "	mat4 " + inputs[i] + " = " + String("mat4(vec4(%.5f, %.5f, %.5f, 0.0), vec4(%.5f, %.5f, %.5f, 0.0), vec4(%.5f, %.5f, %.5f, 0.0), vec4(%.5f, %.5f, %.5f, 1.0));\n").sprintf(values, &err);
-			} else {
-				// TODO: Cleanup
-				//will go empty, node is expected to know what it is doing at this point and handle it
+		String index = prop_name.get_slicec('/', 2);
+		if (index == "connections") {
+			Vector<int> conns;
+			for (const ShaderGraph::Connection &E : graph[type]->connections) {
+				conns.push_back(E.from_node);
+				conns.push_back(E.from_port);
+				conns.push_back(E.to_node);
+				conns.push_back(E.to_port);
+			}
+
+			r_ret = conns;
+			return true;
+		}
+
+		int id = index.to_int();
+		String what = prop_name.get_slicec('/', 3);
+
+		if (what == "node") {
+			r_ret = get_node(type, id);
+			return true;
+		} else if (what == "position") {
+			r_ret = get_node_position(type, id);
+			return true;
+		} else if (what == "size") {
+			VisualShaderNodeResizableBase *resizable_vn = Object::cast_to<VisualShaderNodeResizableBase>(get_node(type, id).ptr());
+			if (resizable_vn) {
+				r_ret = resizable_vn->get_size();
+				return true;
+			}
+		} else if (what == "input_ports") {
+			VisualShaderNodeGroupBase *group_vn = Object::cast_to<VisualShaderNodeGroupBase>(get_node(type, id).ptr());
+			if (group_vn) {
+				r_ret = group_vn->get_inputs();
+				return true;
+			}
+		} else if (what == "output_ports") {
+			VisualShaderNodeGroupBase *group_vn = Object::cast_to<VisualShaderNodeGroupBase>(get_node(type, id).ptr());
+			if (group_vn) {
+				r_ret = group_vn->get_outputs();
+				return true;
+			}
+		} else if (what == "expression") {
+			VisualShaderNodeExpression *expression_vn = Object::cast_to<VisualShaderNodeExpression>(get_node(type, id).ptr());
+			if (expression_vn) {
+				r_ret = expression_vn->get_expression();
+				return true;
 			}
 		}
 	}
+	return false;
+}
 
-	int output_count = vsnode->get_output_port_count();
-	int initial_output_count = output_count;
+void VisualShader::reset_state() {
+	// TODO: Everything needs to be cleared here. Evaluate this or implement it.
+	emit_changed();
+}
 
-	HashMap<int, bool> expanded_output_ports;
+void VisualShader::_get_property_list(List<PropertyInfo> *p_list) const {
+	//mode
+	p_list->push_back(PropertyInfo(Variant::INT, PNAME("mode"), PROPERTY_HINT_ENUM, "Spatial,CanvasItem,Particles,Sky,Fog"));
+	//render modes
 
-	for (int i = 0; i < initial_output_count; i++) {
-		bool expanded = false;
+	HashMap<String, String> blend_mode_enums;
+	HashSet<String> toggles;
 
-		if (vsnode->is_output_port_expandable(i) && vsnode->_is_output_port_expanded(i)) {
-			expanded = true;
+	const Vector<ShaderLanguage::ModeInfo> &rmodes = ShaderTypes::get_singleton()->get_modes(RenderingServer::ShaderMode(shader_mode));
 
-			switch (vsnode->get_output_port_type(i)) {
-				case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-					output_count += 2;
-				} break;
-				case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-					output_count += 3;
-				} break;
-				case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-					output_count += 4;
-				} break;
-				default:
-					break;
-			}
-		}
-		expanded_output_ports.insert(i, expanded);
-	}
+	for (int i = 0; i < rmodes.size(); i++) {
+		const ShaderLanguage::ModeInfo &info = rmodes[i];
 
-	Vector<String> output_vars;
-	output_vars.resize(output_count);
-	String *outputs = output_vars.ptrw();
+		if (!info.options.is_empty()) {
+			const String begin = String(info.name);
 
-	if (vsnode->is_simple_decl()) { // less code to generate for some simple_decl nodes
-		for (int i = 0, j = 0; i < initial_output_count; i++, j++) {
-			String var_name = "n_out" + itos(p_node) + "p" + itos(j);
-			switch (vsnode->get_output_port_type(i)) {
-				case VisualShaderNode::PORT_TYPE_SCALAR:
-					outputs[i] = "float " + var_name;
-					break;
-				case VisualShaderNode::PORT_TYPE_SCALAR_INT:
-					outputs[i] = "int " + var_name;
-					break;
-				case VisualShaderNode::PORT_TYPE_SCALAR_UINT:
-					outputs[i] = "uint " + var_name;
-					break;
-				case VisualShaderNode::PORT_TYPE_VECTOR_2D:
-					outputs[i] = "vec2 " + var_name;
-					break;
-				case VisualShaderNode::PORT_TYPE_VECTOR_3D:
-					outputs[i] = "vec3 " + var_name;
-					break;
-				case VisualShaderNode::PORT_TYPE_VECTOR_4D:
-					outputs[i] = "vec4 " + var_name;
-					break;
-				case VisualShaderNode::PORT_TYPE_BOOLEAN:
-					outputs[i] = "bool " + var_name;
-					break;
-				case VisualShaderNode::PORT_TYPE_TRANSFORM:
-					outputs[i] = "mat4 " + var_name;
-					break;
-				default:
-					break;
-			}
-			if (expanded_output_ports[i]) {
-				switch (vsnode->get_output_port_type(i)) {
-					case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-						j += 2;
-					} break;
-					case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-						j += 3;
-					} break;
-					case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-						j += 4;
-					} break;
-					default:
-						break;
-				}
-			}
-		}
+			for (int j = 0; j < info.options.size(); j++) {
+				const String option = String(info.options[j]).capitalize();
 
-	} else {
-		for (int i = 0, j = 0; i < initial_output_count; i++, j++) {
-			outputs[i] = "n_out" + itos(p_node) + "p" + itos(j);
-			switch (vsnode->get_output_port_type(i)) {
-				case VisualShaderNode::PORT_TYPE_SCALAR:
-					r_code += "	float " + outputs[i] + ";\n";
-					break;
-				case VisualShaderNode::PORT_TYPE_SCALAR_INT:
-					r_code += "	int " + outputs[i] + ";\n";
-					break;
-				case VisualShaderNode::PORT_TYPE_SCALAR_UINT:
-					r_code += "	uint " + outputs[i] + ";\n";
-					break;
-				case VisualShaderNode::PORT_TYPE_VECTOR_2D:
-					r_code += "	vec2 " + outputs[i] + ";\n";
-					break;
-				case VisualShaderNode::PORT_TYPE_VECTOR_3D:
-					r_code += "	vec3 " + outputs[i] + ";\n";
-					break;
-				case VisualShaderNode::PORT_TYPE_VECTOR_4D:
-					r_code += "	vec4 " + outputs[i] + ";\n";
-					break;
-				case VisualShaderNode::PORT_TYPE_BOOLEAN:
-					r_code += "	bool " + outputs[i] + ";\n";
-					break;
-				case VisualShaderNode::PORT_TYPE_TRANSFORM:
-					r_code += "	mat4 " + outputs[i] + ";\n";
-					break;
-				default:
-					break;
-			}
-			if (expanded_output_ports[i]) {
-				switch (vsnode->get_output_port_type(i)) {
-					case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-						j += 2;
-					} break;
-					case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-						j += 3;
-					} break;
-					case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-						j += 4;
-					} break;
-					default:
-						break;
+				if (!blend_mode_enums.has(begin)) {
+					blend_mode_enums[begin] = option;
+				} else {
+					blend_mode_enums[begin] += "," + option;
 				}
 			}
+		} else {
+			toggles.insert(String(info.name));
 		}
 	}
 
-	node_code += vsnode->generate_code(get_mode(), type, p_node, inputs, outputs, p_for_preview);
-	if (!node_code.is_empty()) {
-		r_code += node_name;
-		r_code += node_code;
+	for (const KeyValue<String, String> &E : blend_mode_enums) {
+		p_list->push_back(PropertyInfo(Variant::INT, vformat("%s/%s", PNAME("modes"), E.key), PROPERTY_HINT_ENUM, E.value));
 	}
 
-	for (int i = 0; i < output_count; i++) {
-		if (expanded_output_ports[i]) {
-			switch (vsnode->get_output_port_type(i)) {
-				case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
-					if (vsnode->is_output_port_connected(i + 1) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 1))) { // red-component
-						String r = "n_out" + itos(p_node) + "p" + itos(i + 1);
-						r_code += "	float " + r + " = n_out" + itos(p_node) + "p" + itos(i) + ".r;\n";
-						outputs[i + 1] = r;
-					}
-
-					if (vsnode->is_output_port_connected(i + 2) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 2))) { // green-component
-						String g = "n_out" + itos(p_node) + "p" + itos(i + 2);
-						r_code += "	float " + g + " = n_out" + itos(p_node) + "p" + itos(i) + ".g;\n";
-						outputs[i + 2] = g;
-					}
-
-					i += 2;
-				} break;
-				case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
-					if (vsnode->is_output_port_connected(i + 1) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 1))) { // red-component
-						String r = "n_out" + itos(p_node) + "p" + itos(i + 1);
-						r_code += "	float " + r + " = n_out" + itos(p_node) + "p" + itos(i) + ".r;\n";
-						outputs[i + 1] = r;
-					}
-
-					if (vsnode->is_output_port_connected(i + 2) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 2))) { // green-component
-						String g = "n_out" + itos(p_node) + "p" + itos(i + 2);
-						r_code += "	float " + g + " = n_out" + itos(p_node) + "p" + itos(i) + ".g;\n";
-						outputs[i + 2] = g;
-					}
-
-					if (vsnode->is_output_port_connected(i + 3) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 3))) { // blue-component
-						String b = "n_out" + itos(p_node) + "p" + itos(i + 3);
-						r_code += "	float " + b + " = n_out" + itos(p_node) + "p" + itos(i) + ".b;\n";
-						outputs[i + 3] = b;
-					}
+	for (const String &E : toggles) {
+		p_list->push_back(PropertyInfo(Variant::BOOL, vformat("%s/%s", PNAME("flags"), E)));
+	}
 
-					i += 3;
-				} break;
-				case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-					if (vsnode->is_output_port_connected(i + 1) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 1))) { // red-component
-						String r = "n_out" + itos(p_node) + "p" + itos(i + 1);
-						r_code += "	float " + r + " = n_out" + itos(p_node) + "p" + itos(i) + ".r;\n";
-						outputs[i + 1] = r;
-					}
+	for (const KeyValue<String, Varying> &E : varyings) {
+		p_list->push_back(PropertyInfo(Variant::STRING, vformat("%s/%s", "varyings", E.key), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
+	}
 
-					if (vsnode->is_output_port_connected(i + 2) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 2))) { // green-component
-						String g = "n_out" + itos(p_node) + "p" + itos(i + 2);
-						r_code += "	float " + g + " = n_out" + itos(p_node) + "p" + itos(i) + ".g;\n";
-						outputs[i + 2] = g;
-					}
+#ifdef TOOLS_ENABLED
+	if (Engine::get_singleton()->is_editor_hint()) {
+		for (const KeyValue<String, Variant> &E : preview_params) {
+			p_list->push_back(PropertyInfo(Variant::STRING, vformat("%s/%s", "preview_params", E.key), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
+		}
+	}
+#endif // TOOLS_ENABLED
 
-					if (vsnode->is_output_port_connected(i + 3) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 3))) { // blue-component
-						String b = "n_out" + itos(p_node) + "p" + itos(i + 3);
-						r_code += "	float " + b + " = n_out" + itos(p_node) + "p" + itos(i) + ".b;\n";
-						outputs[i + 3] = b;
-					}
+	for (int i = 0; i < TYPE_MAX; i++) {
+		for (const KeyValue<int, ShaderGraph::Node> &E : graph[i]->nodes) {
+			String prop_name = "nodes/";
+			prop_name += type_string[i];
+			prop_name += "/" + itos(E.key);
 
-					if (vsnode->is_output_port_connected(i + 4) || (p_for_preview && vsnode->get_output_port_for_preview() == (i + 4))) { // alpha-component
-						String a = "n_out" + itos(p_node) + "p" + itos(i + 4);
-						r_code += "	float " + a + " = n_out" + itos(p_node) + "p" + itos(i) + ".a;\n";
-						outputs[i + 4] = a;
-					}
+			if (E.key != ShaderGraph::NODE_ID_OUTPUT) {
+				p_list->push_back(PropertyInfo(Variant::OBJECT, prop_name + "/node", PROPERTY_HINT_RESOURCE_TYPE, "VisualShaderNode", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_ALWAYS_DUPLICATE));
+			}
+			p_list->push_back(PropertyInfo(Variant::VECTOR2, prop_name + "/position", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
 
-					i += 4;
-				} break;
-				default:
-					break;
+			if (Object::cast_to<VisualShaderNodeGroupBase>(E.value.node.ptr()) != nullptr) {
+				p_list->push_back(PropertyInfo(Variant::VECTOR2, prop_name + "/size", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
+				p_list->push_back(PropertyInfo(Variant::STRING, prop_name + "/input_ports", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
+				p_list->push_back(PropertyInfo(Variant::STRING, prop_name + "/output_ports", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
+			}
+			if (Object::cast_to<VisualShaderNodeExpression>(E.value.node.ptr()) != nullptr) {
+				p_list->push_back(PropertyInfo(Variant::STRING, prop_name + "/expression", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
 			}
 		}
+		p_list->push_back(PropertyInfo(Variant::PACKED_INT32_ARRAY, "nodes/" + String(type_string[i]) + "/connections", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
 	}
+}
 
-	if (!node_code.is_empty()) {
-		r_code += "\n\n";
-	}
-
-	r_processed.insert(p_node);
-
-	return OK;
+Error VisualShader::_write_node(
+		ShaderGraph::Type p_type,
+		StringBuilder *p_global_code,
+		StringBuilder *p_global_code_per_node,
+		HashMap<ShaderGraph::Type,
+				StringBuilder> *p_global_code_per_func,
+		StringBuilder &r_code,
+		Vector<ShaderGraph::DefaultTextureParam> &r_def_tex_params,
+		const VMap<ShaderGraph::ConnectionKey,
+				const List<ShaderGraph::Connection>::Element *> &p_input_connections,
+		const VMap<ShaderGraph::ConnectionKey,
+				const List<ShaderGraph::Connection>::Element *> &p_output_connections,
+		int p_node,
+		HashSet<int> &r_processed,
+		bool p_for_preview,
+		HashSet<StringName> &r_classes) const {
+	return graph[p_type]->_write_node(p_global_code, p_global_code_per_node, p_global_code_per_func, r_code, r_def_tex_params, p_input_connections, p_output_connections, p_node, r_processed, p_for_preview, r_classes, p_type, get_mode());
 }
 
 bool VisualShader::has_func_name(RenderingServer::ShaderMode p_mode, const String &p_func_name) const {
@@ -2813,7 +2885,7 @@ void VisualShader::_update_shader() const {
 
 	StringBuilder global_code;
 	StringBuilder global_code_per_node;
-	HashMap<Type, StringBuilder> global_code_per_func;
+	HashMap<ShaderGraph::Type, StringBuilder> global_code_per_func;
 	StringBuilder shader_code;
 	Vector<ShaderGraph::DefaultTextureParam> default_tex_params;
 	HashSet<StringName> classes;
@@ -2977,8 +3049,8 @@ void VisualShader::_update_shader() const {
 		}
 
 		//make it faster to go around through shader
-		VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> input_connections;
-		VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> output_connections;
+		VMap<ShaderGraph::ConnectionKey, const List<ShaderGraph::Connection>::Element *> input_connections;
+		VMap<ShaderGraph::ConnectionKey, const List<ShaderGraph::Connection>::Element *> output_connections;
 
 		StringBuilder func_code;
 		HashSet<int> processed;
@@ -3039,13 +3111,13 @@ void VisualShader::_update_shader() const {
 		}
 
 		for (const List<ShaderGraph::Connection>::Element *E = graph[i]->connections.front(); E; E = E->next()) {
-			ConnectionKey from_key;
+			ShaderGraph::ConnectionKey from_key;
 			from_key.node = E->get().from_node;
 			from_key.port = E->get().from_port;
 
 			output_connections.insert(from_key, E);
 
-			ConnectionKey to_key;
+			ShaderGraph::ConnectionKey to_key;
 			to_key.node = E->get().to_node;
 			to_key.port = E->get().to_port;
 
@@ -3066,19 +3138,19 @@ void VisualShader::_update_shader() const {
 		}
 		insertion_pos.insert(i, shader_code.get_string_length() + func_code.get_string_length());
 
-		Error err = _write_node(Type(i), &global_code, &global_code_per_node, &global_code_per_func, func_code, default_tex_params, input_connections, output_connections, ShaderGraph::NODE_ID_OUTPUT, processed, false, classes);
+		Error err = _write_node(ShaderGraph::Type(i), &global_code, &global_code_per_node, &global_code_per_func, func_code, default_tex_params, input_connections, output_connections, ShaderGraph::NODE_ID_OUTPUT, processed, false, classes);
 		ERR_FAIL_COND(err != OK);
 
 		if (varying_setters.has(i)) {
 			for (int &E : varying_setters[i]) {
-				err = _write_node(Type(i), &global_code, nullptr, nullptr, func_code, default_tex_params, input_connections, output_connections, E, processed, false, classes);
+				err = _write_node(ShaderGraph::Type(i), &global_code, nullptr, nullptr, func_code, default_tex_params, input_connections, output_connections, E, processed, false, classes);
 				ERR_FAIL_COND(err != OK);
 			}
 		}
 
 		if (emitters.has(i)) {
 			for (int &E : emitters[i]) {
-				err = _write_node(Type(i), &global_code, &global_code_per_node, &global_code_per_func, func_code, default_tex_params, input_connections, output_connections, E, processed, false, classes);
+				err = _write_node(ShaderGraph::Type(i), &global_code, &global_code_per_node, &global_code_per_func, func_code, default_tex_params, input_connections, output_connections, E, processed, false, classes);
 				ERR_FAIL_COND(err != OK);
 			}
 		}
@@ -3217,7 +3289,7 @@ void VisualShader::_update_shader() const {
 		if (!has_func_name(RenderingServer::ShaderMode(shader_mode), func_name[i])) {
 			continue;
 		}
-		String func_code = global_code_per_func[Type(i)].as_string();
+		String func_code = global_code_per_func[ShaderGraph::Type(i)].as_string();
 		if (empty_funcs.has(Type(i)) && !func_code.is_empty()) {
 			func_code = vformat("%s%s%s", String("\nvoid " + String(func_name[i]) + "() {\n"), func_code, "}\n");
 		}
@@ -3325,7 +3397,7 @@ VisualShader::VisualShader() {
 	dirty.set();
 	for (int i = 0; i < TYPE_MAX; i++) {
 		graph[i].instantiate();
-		graph[i]->connect("graph_changed",callable_mp(this, &VisualShader::_queue_update));
+		graph[i]->connect("graph_changed", callable_mp(this, &VisualShader::_queue_update));
 		if (i > (int)TYPE_LIGHT && i < (int)TYPE_SKY) {
 			Ref<VisualShaderNodeParticleOutput> output;
 			output.instantiate();
diff --git a/scene/resources/visual_shader.h b/scene/resources/visual_shader.h
index 0c9a1fab748a..6ff682de0eec 100644
--- a/scene/resources/visual_shader.h
+++ b/scene/resources/visual_shader.h
@@ -45,6 +45,23 @@ class ShaderGraph : public RefCounted {
 	friend class VisualShaderGroup; // For _get,_set and _get_property_list.
 
 public:
+	// TODO: Unify this eventually, but for now this is too much work.
+	// TODO: Rename to ShaderFunction/ShaderStage and make it an enum class.
+	// Keep in sync with VisualShader::Type.
+	enum Type {
+		TYPE_VERTEX,
+		TYPE_FRAGMENT,
+		TYPE_LIGHT,
+		TYPE_START,
+		TYPE_PROCESS,
+		TYPE_COLLIDE,
+		TYPE_START_CUSTOM,
+		TYPE_PROCESS_CUSTOM,
+		TYPE_SKY,
+		TYPE_FOG,
+		TYPE_MAX
+	};
+
 	struct Node {
 		// TODO: Rename to vsnode;
 		Ref<VisualShaderNode> node;
@@ -60,6 +77,17 @@ class ShaderGraph : public RefCounted {
 		int to_port = 0;
 	};
 
+	union ConnectionKey {
+		struct {
+			uint64_t node : 32;
+			uint64_t port : 32;
+		};
+		uint64_t key = 0;
+		bool operator<(const ConnectionKey &p_key) const {
+			return key < p_key.key;
+		}
+	};
+
 	struct DefaultTextureParam {
 		StringName name;
 		List<Ref<Texture>> params;
@@ -76,6 +104,7 @@ class ShaderGraph : public RefCounted {
 	List<Connection> connections; // TODO: Evaluate whether this should be a LocalVector.
 
 	void _node_changed();
+
 protected:
 	static void _bind_methods();
 
@@ -84,7 +113,24 @@ class ShaderGraph : public RefCounted {
 	void _get_property_list(List<PropertyInfo> *p_list) const;
 
 public:
+	Error _write_node(
+			StringBuilder *p_global_code,
+			StringBuilder *p_global_code_per_node,
+			HashMap<Type, StringBuilder> *p_global_code_per_func,
+			StringBuilder &r_code,
+			Vector<ShaderGraph::DefaultTextureParam> &r_def_tex_params,
+			const VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> &p_input_connections,
+			const VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> &p_output_connections,
+			int p_node,
+			HashSet<int> &r_processed,
+			bool p_for_preview,
+			HashSet<StringName> &r_classes,
+			Type p_type = TYPE_MAX, // Only used for VisualShader.
+			Shader::Mode p_mode = Shader::MODE_MAX // Only used for VisualShader.
+			) const;
+
 	bool _check_reroute_subgraph(int p_target_port_type, int p_reroute_node, List<int> *r_visited_reroute_nodes = nullptr) const;
+
 	void add_node(const Ref<VisualShaderNode> &p_node, const Vector2 &p_position, int p_id);
 	void set_node_position(int p_id, const Vector2 &p_position);
 	Vector2 get_node_position(int p_id) const;
@@ -226,19 +272,20 @@ class VisualShader : public Shader {
 	mutable SafeFlag dirty;
 	void _queue_update();
 
-	// TODO: Move up.
-	union ConnectionKey {
-		struct {
-			uint64_t node : 32;
-			uint64_t port : 32;
-		};
-		uint64_t key = 0;
-		bool operator<(const ConnectionKey &p_key) const {
-			return key < p_key.key;
-		}
-	};
-
-	Error _write_node(Type p_type, StringBuilder *p_global_code, StringBuilder *p_global_code_per_node, HashMap<Type, StringBuilder> *p_global_code_per_func, StringBuilder &r_code, Vector<ShaderGraph::DefaultTextureParam> &r_def_tex_params, const VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> &p_input_connections, const VMap<ConnectionKey, const List<ShaderGraph::Connection>::Element *> &p_output_connections, int p_node, HashSet<int> &r_processed, bool p_for_preview, HashSet<StringName> &r_classes) const;
+	Error _write_node(
+			ShaderGraph::Type p_type,
+			StringBuilder *p_global_code,
+			StringBuilder *p_global_code_per_node,
+			HashMap<ShaderGraph::Type, StringBuilder> *p_global_code_per_func,
+			StringBuilder &r_code, Vector<ShaderGraph::DefaultTextureParam> &r_def_tex_params,
+			const VMap<ShaderGraph::ConnectionKey,
+					const List<ShaderGraph::Connection>::Element *> &p_input_connections,
+			const VMap<ShaderGraph::ConnectionKey,
+					const List<ShaderGraph::Connection>::Element *> &p_output_connections,
+			int p_node,
+			HashSet<int> &r_processed,
+			bool p_for_preview,
+			HashSet<StringName> &r_classes) const;
 
 	void _input_type_changed(Type p_type, int p_id);
 	// TODO: Check why we need this method. At least rename it (underscore).
@@ -386,6 +433,8 @@ class VisualShaderNode : public Resource {
 	static void _bind_methods();
 
 public:
+	static String port_type_to_shader_string(PortType p_type);
+
 	bool is_simple_decl() const;
 
 	virtual String get_caption() const = 0;
@@ -940,8 +989,6 @@ class VisualShaderNodeGroupBase : public VisualShaderNodeResizableBase {
 	VisualShaderNodeGroupBase();
 };
 
-
-
 class VisualShaderNodeExpression : public VisualShaderNodeGroupBase {
 	GDCLASS(VisualShaderNodeExpression, VisualShaderNodeGroupBase);
 
@@ -1080,8 +1127,6 @@ class VisualShaderNodeVaryingGetter : public VisualShaderNodeVarying {
 	VisualShaderNodeVaryingGetter();
 };
 
-
-
 extern String make_unique_id(VisualShader::Type p_type, int p_id, const String &p_name);
 
 #endif // VISUAL_SHADER_H
diff --git a/scene/resources/visual_shader_group.cpp b/scene/resources/visual_shader_group.cpp
index b9ba4f497909..d726a003bed8 100644
--- a/scene/resources/visual_shader_group.cpp
+++ b/scene/resources/visual_shader_group.cpp
@@ -1,10 +1,81 @@
 #include "visual_shader_group.h"
 
+#include "core/error/error_macros.h"
+#include "core/object/callable_method_pointer.h"
+#include "core/string/ustring.h"
+#include "core/templates/hash_set.h"
+#include "core/templates/vmap.h"
 #include "editor/plugins/visual_shader_editor_plugin.h"
 #include "scene/gui/box_container.h"
+#include "scene/gui/graph_node.h"
 #include "scene/gui/item_list.h"
 #include "scene/gui/line_edit.h"
 #include "scene/gui/option_button.h"
+#include "visual_shader_particle_nodes.h"
+
+String VisualShaderGroup::_validate_port_name(const String &p_port_name, int p_port_id, bool p_output) const {
+	String port_name = p_port_name;
+
+	if (port_name.is_empty()) {
+		return String();
+	}
+
+	while (port_name.length() && !is_ascii_alphabet_char(port_name[0])) {
+		port_name = port_name.substr(1, port_name.length() - 1);
+	}
+
+	if (!port_name.is_empty()) {
+		String valid_name;
+
+		for (int i = 0; i < port_name.length(); i++) {
+			if (is_ascii_identifier_char(port_name[i])) {
+				valid_name += String::chr(port_name[i]);
+			} else if (port_name[i] == ' ') {
+				valid_name += "_";
+			}
+		}
+
+		port_name = valid_name;
+	} else {
+		return String();
+	}
+
+	List<String> input_names;
+	List<String> output_names;
+
+	for (int i = 0; i < get_input_ports().size(); i++) {
+		if (!p_output && i == p_port_id) {
+			continue;
+		}
+		if (port_name == get_input_port(i).name) {
+			return String();
+		}
+	}
+	for (int i = 0; i < get_output_ports().size(); i++) {
+		if (p_output && i == p_port_id) {
+			continue;
+		}
+		if (port_name == get_output_port(i).name) {
+			return String();
+		}
+	}
+
+	return port_name;
+}
+
+String VisualShaderGroup::_validate_group_name(const String &p_name) const {
+	String valid_name;
+
+	for (int i = 0; i < p_name.length(); i++) {
+		if (is_ascii_identifier_char(p_name[i])) {
+			valid_name += String::chr(p_name[i]);
+		} else if (p_name[i] == ' ') {
+			valid_name += "_";
+		}
+	}
+
+	return valid_name;
+}
 
 void VisualShaderGroup::_bind_methods() {
 	// TODO: Bind setters/getters for input/output ports.
@@ -41,6 +112,120 @@ void VisualShaderGroup::_bind_methods() {
 	ADD_PROPERTY_DEFAULT("group_name", "Node group");
 }
 
+void VisualShaderGroup::_queue_update() {
+	if (dirty.is_set()) {
+		return;
+	}
+
+	dirty.set();
+	callable_mp(this, &VisualShaderGroup::_update_group).call_deferred();
+}
+
+void VisualShaderGroup::_update_group() {
+	if (!dirty.is_set()) {
+		return;
+	}
+
+	dirty.clear();
+
+	// TODO: Update group.
+
+	StringBuilder global_code_builder;
+	StringBuilder global_code_per_node_builder;
+	HashMap<ShaderGraph::Type, StringBuilder> global_code_per_func_builder;
+	StringBuilder code_builder;
+	Vector<ShaderGraph::DefaultTextureParam> default_tex_params;
+	// static const char *shader_mode_str[Shader::MODE_MAX] = { "spatial", "canvas_item", "particles", "sky", "fog" };
+
+	HashSet<StringName> classes;
+	HashMap<int, int> insertion_pos;
+
+	String global_expressions;
+	HashSet<String> used_parameter_names;
+	List<VisualShaderNodeParameter *> parameters;
+	List<int> emitters;
+	HashMap<int, List<int>> varying_setters;
+
+	// Preprocess nodes.
+	int index = 0;
+	for (const KeyValue<int, ShaderGraph::Node> &E : graph->nodes) {
+		Ref<VisualShaderNodeGlobalExpression> global_expression = E.value.node;
+		if (global_expression.is_valid()) {
+			String expr = "";
+			expr += "// " + global_expression->get_caption() + ":" + itos(index++) + "\n";
+			expr += global_expression->generate_global(Shader::MODE_MAX, VisualShader::TYPE_MAX, -1);
+			expr = expr.replace("\n", "\n	");
+			expr += "\n";
+			global_expressions += expr;
+		}
+		Ref<VisualShaderNodeParameterRef> parameter_ref = E.value.node;
+		if (parameter_ref.is_valid()) {
+			used_parameter_names.insert(parameter_ref->get_parameter_name());
+		}
+		Ref<VisualShaderNodeParameter> parameter = E.value.node;
+		if (parameter.is_valid()) {
+			parameters.push_back(parameter.ptr());
+		}
+		Ref<VisualShaderNodeParticleEmit> emit_particle = E.value.node;
+		if (emit_particle.is_valid()) {
+			emitters.push_back(E.key);
+		}
+	}
+
+	// TODO: Forbid paramters.
+	// int idx = 0
+	// for (List<VisualShaderNodeParameter *>::Iterator itr = parameters.begin(); itr != parameters.end(); ++itr, ++idx) {
+	// 	VisualShaderNodeParameter *parameter = *itr;
+	// 	if (used_parameter_names.has(parameter->get_parameter_name())) {
+	// 		global_code += parameter->generate_global(get_mode(), Type(idx), -1);
+	// 		const_cast<VisualShaderNodeParameter *>(parameter)->set_global_code_generated(true);
+	// 	} else {
+	// 		const_cast<VisualShaderNodeParameter *>(parameter)->set_global_code_generated(false);
+	// 	}
+	// }
+	HashMap<int, String> code_map;
+	HashSet<int> empty_funcs;
+	VMap<ShaderGraph::ConnectionKey, const List<ShaderGraph::Connection>::Element *> input_connections;
+	VMap<ShaderGraph::ConnectionKey, const List<ShaderGraph::Connection>::Element *> output_connections;
+
+	StringBuilder group_code;
+	HashSet<int> processed;
+
+	for (const List<ShaderGraph::Connection>::Element *E = graph->connections.front(); E; E = E->next()) {
+		ShaderGraph::ConnectionKey from_key;
+		from_key.node = E->get().from_node;
+		from_key.port = E->get().from_port;
+
+		output_connections.insert(from_key, E);
+
+		ShaderGraph::ConnectionKey to_key;
+		to_key.node = E->get().to_node;
+		to_key.port = E->get().to_port;
+
+		input_connections.insert(to_key, E);
+	}
+
+	Error err = graph->_write_node(&global_code_builder, &global_code_per_node_builder, &global_code_per_func_builder, group_code, default_tex_params, input_connections, output_connections, NODE_ID_GROUP_OUTPUT, processed, false, classes);
+	ERR_FAIL_COND(err != OK);
+
+	// TODO: Figure out why this needs to be separately.
+	for (int &E : emitters) {
+		err = graph->_write_node(&global_code_builder, &global_code_per_node_builder, &global_code_per_func_builder, group_code, default_tex_params, input_connections, output_connections, E, processed, false, classes);
+		ERR_FAIL_COND(err != OK);
+	}
+
+	// TODO: Use concept of previous code to determine whether to fire the changed signal?
+
+	code_builder += "// Group content: " + group_name + "\n";
+	code_builder += group_code;
+
+	global_code_builder.append(global_code_per_node_builder);
+	global_code_builder.append(global_expressions);
+	global_code = global_code_builder.as_string();
+	// TODO: Insert global code per func
+	code = code_builder.as_string();
+}
+
 bool VisualShaderGroup::_set(const StringName &p_name, const Variant &p_value) {
 	if (p_name == "input_ports") {
 		input_ports.clear();
@@ -108,12 +293,28 @@ Ref<ShaderGraph> VisualShaderGroup::get_graph() const {
 	return graph;
 }
 
+String VisualShaderGroup::get_code() {
+	if (dirty.is_set()) {
+		_update_group();
+	}
+	return code;
+}
+
+String VisualShaderGroup::get_global_code() {
+	if (dirty.is_set()) {
+		_update_group();
+	}
+	return global_code;
+}
+
 void VisualShaderGroup::set_group_name(const String &p_name) {
-	if (group_name == p_name) {
+	const String valid_name = _validate_group_name(p_name);
+
+	if (group_name == p_name || valid_name.is_empty()) {
 		return;
 	}
 
-	group_name = p_name;
+	group_name = p_name; // Don't use valid_name here, since we want to keep the original name.
 	emit_changed();
 }
 
@@ -122,16 +323,32 @@ String VisualShaderGroup::get_group_name() const {
 }
 
 void VisualShaderGroup::add_input_port(int p_id, VisualShaderNode::PortType p_type, const String &p_name) {
-	input_ports[p_id] = Port{ p_type, p_name };
+	const String valid_name = _validate_port_name(p_name, p_id, false);
+
+	if (valid_name.is_empty()) {
+		return;
+	}
+
+	input_ports[p_id] = Port{ p_type, valid_name };
 	emit_changed();
 }
 
 void VisualShaderGroup::set_input_port_name(int p_id, const String &p_name) {
-	input_ports[p_id].name = p_name;
+	ERR_FAIL_COND(!input_ports.has(p_id));
+
+	const String valid_name = _validate_port_name(p_name, p_id, false);
+
+	if (valid_name.is_empty()) {
+		return;
+	}
+
+	input_ports[p_id].name = valid_name;
 	emit_changed();
 }
 
 void VisualShaderGroup::set_input_port_type(int p_id, VisualShaderNode::PortType p_type) {
+	ERR_FAIL_COND(!input_ports.has(p_id));
+
 	input_ports[p_id].type = p_type;
 	emit_changed();
 }
@@ -154,16 +371,32 @@ void VisualShaderGroup::remove_input_port(int p_id) {
 }
 
 void VisualShaderGroup::add_output_port(int p_id, VisualShaderNode::PortType p_type, const String &p_name) {
-	output_ports[p_id] = Port{ p_type, p_name };
+	const String valid_name = _validate_port_name(p_name, p_id, true);
+
+	if (valid_name.is_empty()) {
+		return;
+	}
+
+	output_ports[p_id] = Port{ p_type, valid_name };
 	emit_changed();
 }
 
 void VisualShaderGroup::set_output_port_name(int p_id, const String &p_name) {
-	output_ports[p_id].name = p_name;
+	ERR_FAIL_COND(!output_ports.has(p_id));
+
+	const String valid_name = _validate_port_name(p_name, p_id, true);
+
+	if (valid_name.is_empty()) {
+		return;
+	}
+
+	output_ports[p_id].name = valid_name;
 	emit_changed();
 }
 
 void VisualShaderGroup::set_output_port_type(int p_id, VisualShaderNode::PortType p_type) {
+	ERR_FAIL_COND(!output_ports.has(p_id));
+
 	output_ports[p_id].type = p_type;
 	emit_changed();
 }
@@ -266,7 +499,10 @@ void VisualShaderGroup::get_node_connections(List<ShaderGraph::Connection> *r_co
 }
 
 VisualShaderGroup::VisualShaderGroup() {
+	dirty.set();
+
 	graph.instantiate();
+	graph->connect("graph_changed", callable_mp(this, &VisualShaderGroup::_queue_update));
 
 	Ref<VisualShaderNodeGroupInput> input_node;
 	input_node.instantiate();
@@ -280,7 +516,7 @@ VisualShaderGroup::VisualShaderGroup() {
 	graph->nodes[NODE_ID_GROUP_OUTPUT].node = output_node;
 	graph->nodes[NODE_ID_GROUP_OUTPUT].position = Vector2(400, 150);
 
-	group_name == TTR("Node group");
+	group_name = TTR("Node group");
 }
 
 ////////////// Group
@@ -371,9 +607,93 @@ Ref<VisualShaderGroup> VisualShaderNodeGroup::get_group() const {
 	return group;
 }
 
+void VisualShaderNodeGroup::set_shader_type(ShaderGraph::Type p_type) {
+	shader_type = p_type;
+}
+
+void VisualShaderNodeGroup::set_shader_mode(Shader::Mode p_mode) {
+	shader_mode = p_mode;
+}
+
 String VisualShaderNodeGroup::generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview) const {
-	// TODO: Implement.
-	return String();
+	if (group.is_null()) {
+		return String();
+	}
+	// TODO:Validate name and append unique id.
+
+	// Generate the code for the group.
+	String code = String("/* Group: ") + group->get_group_name() + " */\n";
+
+	const String valid_group_name = group->_validate_group_name(group->get_group_name());
+	ERR_FAIL_COND_V(valid_group_name.is_empty(), "");
+	code += "group_" + valid_group_name + "(";
+
+	const Vector<VisualShaderGroup::Port> input_ports = group->get_input_ports();
+	int param_idx = 0;
+	for (int i = 0; i < input_ports.size(); i++) {
+		if (i > 0) {
+			code += ",";
+		}
+		code += p_input_vars[i];
+		param_idx++;
+	}
+
+	const Vector<VisualShaderGroup::Port> output_ports = group->get_output_ports();
+	for (int i = 0; i < output_ports.size(); i++) {
+		if (param_idx > 0) {
+			code += ",";
+		}
+		code += p_output_vars[i];
+		param_idx++;
+	}
+
+	code += ");\n";
+
+	return code;
+}
+
+String VisualShaderNodeGroup::generate_group_function(Shader::Mode p_mode, VisualShader::Type p_type, int p_id) const {
+	if (group.is_null()) {
+		return String();
+	}
+
+	// Generate a global function for the group.
+	String code = String("/* Group: ") + group->get_group_name() + " */\n";
+
+	code += group->get_global_code();
+
+	// TODO: Don't use the type and id for the function name.
+	const String valid_group_name = group->_validate_group_name(group->get_group_name());
+	ERR_FAIL_COND_V(valid_group_name.is_empty(), "");
+
+	code += "void group_" + valid_group_name + "(";
+
+	// Add all inputs/outputs as function parameters.
+	const Vector<VisualShaderGroup::Port> input_ports = group->get_input_ports();
+	for (int i = 0; i < input_ports.size(); i++) {
+		if (i == 0) {
+			code += "in ";
+		} else {
+			code += ", in ";
+		}
+		code += VisualShaderNode::port_type_to_shader_string(input_ports[i].type) + " ";
+		code += input_ports[i].name;
+	}
+
+	const Vector<VisualShaderGroup::Port> output_ports = group->get_output_ports();
+	for (int i = 0; i < output_ports.size(); i++) {
+		code += ", out ";
+		code += VisualShaderNode::port_type_to_shader_string(output_ports[i].type) + " ";
+		code += output_ports[i].name;
+	}
+
+	code += ") {\n";
+
+	// Add the code for the group.
+	code += group->get_code();
+
+	code += "}\n";
+	return code;
 }
 
 bool VisualShaderNodeGroup::is_output_port_expandable(int p_port) const {
@@ -385,14 +705,6 @@ VisualShaderNodeGroup::VisualShaderNodeGroup() {
 	simple_decl = false;
 }
 
-// void VisualShaderNodeGroupInput::_bind_methods() {
-// 	// TODO: Implement?
-// }
-
-// void VisualShaderNodeGroupInput::_validate_property(PropertyInfo &p_property) const {
-// 	// TODO: Implement?
-// }
-
 void VisualShaderNodeGroupInput::set_group(VisualShaderGroup *p_group) {
 	group = p_group;
 }
@@ -444,8 +756,13 @@ String VisualShaderNodeGroupInput::get_caption() const {
 }
 
 String VisualShaderNodeGroupInput::generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview) const {
-	// TODO: Implement.
-	return String();
+	ERR_FAIL_NULL_V(group, "");
+
+	String code;
+	for (int i = 0; i < group->get_input_ports().size(); i++) {
+		code += p_output_vars[i] + " = " + group->get_input_port(i).name + ";\n";
+	}
+	return code;
 }
 
 Vector<StringName> VisualShaderNodeGroupInput::get_editable_properties() const {
@@ -511,7 +828,16 @@ String VisualShaderNodeGroupOutput::get_caption() const {
 }
 
 String VisualShaderNodeGroupOutput::generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview) const {
-	return String();
+	ERR_FAIL_NULL_V(group, String());
+
+	String code;
+	for (int i = 0; i < group->get_output_ports().size(); i++) {
+		if (p_input_vars[i].is_empty()) {
+			continue;
+		};
+		code += group->get_output_port(i).name + " = " + p_input_vars[i] + ";\n";
+	}
+	return code;
 }
 
 VisualShaderNodeGroupOutput::VisualShaderNodeGroupOutput() {
@@ -522,7 +848,16 @@ void VisualShaderGroupPortsDialog::_add_port() {
 
 	// Add a new port to the group.
 	const VisualShaderNode::PortType port_type = VisualShaderNode::PORT_TYPE_SCALAR;
-	const String port_name = "new_port";
+	String port_name = edit_inputs ? "new_in_port" : "new_out_port";
+
+	// Find a new valid name for the port.
+	int port_idx = 2;
+	String port_name_numerated = port_name;
+	while (group->_validate_port_name(port_name_numerated, -1, !edit_inputs).is_empty()) {
+		port_name_numerated = port_name + itos(port_idx);
+	}
+	port_name = port_name_numerated;
+
 	if (edit_inputs) {
 		group->add_input_port(group->get_input_ports().size(), port_type, port_name);
 	} else {
@@ -555,6 +890,7 @@ void VisualShaderGroupPortsDialog::_update_editor_for_port(int p_idx) {
 	port_type_optbtn->set_visible(true);
 
 	// Update the controls in the editor area of the dialog.
+	ERR_FAIL_INDEX(p_idx, edit_inputs ? group->get_input_ports().size() : group->get_output_ports().size());
 	const VisualShaderGroup::Port port = edit_inputs ? group->get_input_port(p_idx) : group->get_output_port(p_idx);
 
 	name_edit->set_text(port.name);
@@ -592,6 +928,7 @@ void VisualShaderGroupPortsDialog::_on_port_item_selected(int p_index) {
 
 void VisualShaderGroupPortsDialog::_on_port_name_changed(const String &p_name) {
 	ERR_FAIL_NULL(group);
+	ERR_FAIL_COND(port_item_list->get_selected_items().size() != 1);
 
 	// Update the port name in the group.
 	const int port_idx = port_item_list->get_selected_items()[0];
@@ -607,6 +944,7 @@ void VisualShaderGroupPortsDialog::_on_port_name_changed(const String &p_name) {
 
 void VisualShaderGroupPortsDialog::_on_port_type_changed(int p_idx) {
 	ERR_FAIL_NULL(group);
+	ERR_FAIL_COND(port_item_list->get_selected_items().size() != 1);
 
 	// Update the port type in the group.
 	const int port_idx = port_item_list->get_selected_items()[0];
@@ -621,7 +959,23 @@ void VisualShaderGroupPortsDialog::_on_port_type_changed(int p_idx) {
 	port_item_list->set_item_icon_modulate(port_idx, port_colors[p_idx]);
 }
 
+void VisualShaderGroupPortsDialog::_on_dialog_about_to_popup() {
+	ERR_FAIL_NULL(group);
+	if (port_item_list->get_item_count() == 0) {
+		_update_editor_for_port(-1);
+		return;
+	}
+
+	if (port_item_list->get_selected_items().size() != 1) {
+		port_item_list->select(0);
+	}
+	_update_editor_for_port(port_item_list->get_selected_items()[0]);
+}
+
 void VisualShaderGroupPortsDialog::set_dialog_mode(bool p_edit_inputs) {
+	if (edit_inputs == p_edit_inputs) {
+		return;
+	}
 	edit_inputs = p_edit_inputs;
 }
 
@@ -639,11 +993,12 @@ void VisualShaderGroupPortsDialog::set_group(VisualShaderGroup *p_group) {
 		port_item_list->add_item(ports[i].name, port_icon);
 		port_item_list->set_item_icon_modulate(i, port_colors[ports[i].type]);
 	}
-
-	port_item_list->select(0);
 }
 
 VisualShaderGroupPortsDialog::VisualShaderGroupPortsDialog() {
+	connect(SNAME("about_to_popup"), callable_mp(this, &VisualShaderGroupPortsDialog::_on_dialog_about_to_popup));
+	set_title("Edit group ports");
+
 	VBoxContainer *vbc = memnew(VBoxContainer);
 	add_child(vbc);
 
diff --git a/scene/resources/visual_shader_group.h b/scene/resources/visual_shader_group.h
index d833cf5a49f4..c4ee342fbd25 100644
--- a/scene/resources/visual_shader_group.h
+++ b/scene/resources/visual_shader_group.h
@@ -7,6 +7,9 @@
 class VisualShaderGroup : public Resource {
 	GDCLASS(VisualShaderGroup, Resource);
 
+	inline static int NODE_ID_GROUP_INPUT = 0;
+	inline static int NODE_ID_GROUP_OUTPUT = 1;
+
 public:
 	struct Port {
 		VisualShaderNode::PortType type = VisualShaderNode::PortType::PORT_TYPE_MAX;
@@ -22,22 +25,32 @@ class VisualShaderGroup : public Resource {
 
 	Ref<ShaderGraph> graph;
 
-	inline static int NODE_ID_GROUP_INPUT = 0;
-	inline static int NODE_ID_GROUP_OUTPUT = 1;
+	mutable SafeFlag dirty;
+	String code;
+	String global_code;
 
 protected:
 	static void _bind_methods();
 
+	void _queue_update();
+	void _update_group();
+
 	bool _set(const StringName &p_name, const Variant &p_value);
 	bool _get(const StringName &p_name, Variant &r_ret) const;
 	void _get_property_list(List<PropertyInfo> *p_list) const;
 
 public:
 	Ref<ShaderGraph> get_graph() const;
+	String get_code();
+	String get_global_code();
 
 	void set_group_name(const String &p_name);
 	String get_group_name() const;
 
+	// TODO: Make private?
+	String _validate_port_name(const String &p_port_name, int p_port_id, bool p_output) const;
+	String _validate_group_name(const String &p_name) const;
+
 	void add_input_port(int p_id, VisualShaderNode::PortType p_type, const String &p_name);
 	void set_input_port_name(int p_id, const String &p_name);
 	void set_input_port_type(int p_id, VisualShaderNode::PortType p_type);
@@ -68,7 +81,6 @@ class VisualShaderGroup : public Resource {
 	// TODO: Rename this method and evaluate whether it is necessary.
 	bool are_nodes_connected(int p_from_node, int p_from_port, int p_to_node, int p_to_port) const;
 
-	// TODO: Do you need the graph as a parameter
 	bool is_nodes_connected_relatively(int p_node, int p_target) const;
 	bool can_connect_nodes(int p_from_node, int p_from_port, int p_to_node, int p_to_port) const;
 	Error connect_nodes(int p_from_node, int p_from_port, int p_to_node, int p_to_port);
@@ -82,12 +94,10 @@ class VisualShaderGroup : public Resource {
 	String get_reroute_parameter_name(int p_reroute_node) const;
 
 	// TODO: Maybe change this method to use a return type.
-
 	void get_node_connections(List<ShaderGraph::Connection> *r_connections) const;
 	// TODO: Implement?
 	String generate_preview_shader(int p_node, int p_port, Vector<ShaderGraph::DefaultTextureParam> &r_default_tex_params) const;
 
-	String validate_port_name(const String &p_port_name, VisualShaderNode *p_node, int p_port_id, bool p_output) const;
 	// TODO: Implement?
 	String validate_parameter_name(const String &p_name, const Ref<VisualShaderNodeParameter> &p_parameter) const;
 
@@ -99,6 +109,10 @@ class VisualShaderNodeGroup : public VisualShaderNode {
 
 	Ref<VisualShaderGroup> group;
 
+	// For validation.
+	ShaderGraph::Type shader_type = ShaderGraph::Type::TYPE_MAX; // TYPE_MAX when used in a VisualShaderGroup itself.
+	Shader::Mode shader_mode = Shader::Mode::MODE_MAX; // MODE_MAX when used in a VisualShaderGroup itself.
+
 	void _emit_changed();
 
 protected:
@@ -122,7 +136,12 @@ class VisualShaderNodeGroup : public VisualShaderNode {
 	void set_group(const Ref<VisualShaderGroup> &p_group);
 	Ref<VisualShaderGroup> get_group() const;
 
+	void set_shader_type(ShaderGraph::Type p_type);
+	void set_shader_mode(Shader::Mode p_mode);
+
 	virtual String generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview = false) const override;
+	// virtual String generate_global(Shader::Mode p_mode, VisualShader::Type p_type, int p_id) const override;
+	String generate_group_function(Shader::Mode p_mode, VisualShader::Type p_type, int p_id) const;
 	virtual bool is_output_port_expandable(int p_port) const override;
 
 	virtual Category get_category() const override { return CATEGORY_SPECIAL; }
@@ -142,15 +161,8 @@ class VisualShaderNodeGroupInput : public VisualShaderNode {
 	// 	const char *string;
 	// };
 
-	// static const Port ports[];
 	// static const Port preview_ports[];
 
-	// String input_name = "[None]";
-
-protected:
-	// static void _bind_methods();
-	// void _validate_property(PropertyInfo &p_property) const;
-
 public:
 	void set_group(VisualShaderGroup *p_group);
 	VisualShaderGroup *get_group() const;
@@ -189,7 +201,7 @@ class VisualShaderNodeGroupOutput : public VisualShaderNode {
 	GDCLASS(VisualShaderNodeGroupOutput, VisualShaderNode);
 
 	// TODO: Possibly dangerous, but it is necessary for now since we don't have a proper weak reference.
-	VisualShaderGroup *group;
+	VisualShaderGroup *group = nullptr;
 
 	// struct Port {
 	// 	PortType type = PortType::PORT_TYPE_MAX;
@@ -249,6 +261,7 @@ class VisualShaderGroupPortsDialog : public AcceptDialog {
 	void _on_port_item_selected(int p_idx);
 	void _on_port_name_changed(const String &p_name);
 	void _on_port_type_changed(int p_idx);
+	void _on_dialog_about_to_popup();
 
 	// TODO: Update graph on exit.
 public: