Add alpha channel display to vec4 previews of visual shader nodes

editor/plugins/visual_shader_editor_plugin.cpp

@@ -258,7 +258,7 @@ void VisualShaderGraphPlugin::show_port_preview(VisualShader::Type p_type, int p
 			vbox->add_child(offset);
 
 			VisualShaderNodePortPreview *port_preview = memnew(VisualShaderNodePortPreview);
-			port_preview->setup(visual_shader, editor->preview_material, visual_shader->get_shader_type(), p_node_id, p_port_id, p_is_valid);
+			port_preview->setup(visual_shader, editor->preview_material, visual_shader->get_shader_type(), links[p_node_id].output_ports[p_port_id].type == VisualShaderNode::PORT_TYPE_VECTOR_4D, p_node_id, p_port_id, p_is_valid);
 			port_preview->set_h_size_flags(Control::SIZE_SHRINK_CENTER);
 			vbox->add_child(port_preview);
 			link.preview_visible = true;
@@ -554,8 +554,8 @@ void VisualShaderGraphPlugin::register_link(VisualShader::Type p_type, int p_id,
 	links.insert(p_id, { p_type, p_visual_node, p_graph_element, p_visual_node->get_output_port_for_preview() != -1, -1, HashMap<int, InputPort>(), HashMap<int, Port>(), nullptr, nullptr, nullptr, { nullptr, nullptr, nullptr } });
 }
 
-void VisualShaderGraphPlugin::register_output_port(int p_node_id, int p_port, TextureButton *p_button) {
-	links[p_node_id].output_ports.insert(p_port, { p_button });
+void VisualShaderGraphPlugin::register_output_port(int p_node_id, int p_port, VisualShaderNode::PortType p_port_type, TextureButton *p_button) {
+	links[p_node_id].output_ports.insert(p_port, { p_port_type, p_button });
 }
 
 void VisualShaderGraphPlugin::register_parameter_name(int p_node_id, LineEdit *p_parameter_name) {
@@ -1220,7 +1220,7 @@ void VisualShaderGraphPlugin::add_node(VisualShader::Type p_type, int p_id, bool
 				preview->set_texture_pressed(editor->get_editor_theme_icon(SNAME("GuiVisibilityVisible")));
 				preview->set_v_size_flags(Control::SIZE_SHRINK_CENTER);
 
-				register_output_port(p_id, j, preview);
+				register_output_port(p_id, j, port_right, preview);
 
 				preview->connect(SceneStringName(pressed), callable_mp(editor, &VisualShaderEditor::_preview_select_port).bind(p_id, j), CONNECT_DEFERRED);
 				hb->add_child(preview);
@@ -8032,7 +8032,15 @@ void VisualShaderNodePortPreview::_shader_changed() {
 	set_material(mat);
 }
 
-void VisualShaderNodePortPreview::setup(const Ref<VisualShader> &p_shader, Ref<ShaderMaterial> &p_preview_material, VisualShader::Type p_type, int p_node, int p_port, bool p_is_valid) {
+void VisualShaderNodePortPreview::setup(const Ref<VisualShader> &p_shader, Ref<ShaderMaterial> &p_preview_material, VisualShader::Type p_type, bool p_has_transparency, int p_node, int p_port, bool p_is_valid) {
+	if (p_has_transparency) {
+		checkerboard = memnew(TextureRect);
+		checkerboard->set_stretch_mode(TextureRect::STRETCH_TILE);
+		checkerboard->set_anchors_and_offsets_preset(Control::PRESET_FULL_RECT);
+		checkerboard->set_draw_behind_parent(true);
+		add_child(checkerboard);
+	}
+
 	shader = p_shader;
 	shader->connect_changed(callable_mp(this, &VisualShaderNodePortPreview::_shader_changed), CONNECT_DEFERRED);
 	preview_mat = p_preview_material;
@@ -8051,6 +8059,11 @@ Size2 VisualShaderNodePortPreview::get_minimum_size() const {
 
 void VisualShaderNodePortPreview::_notification(int p_what) {
 	switch (p_what) {
+		case NOTIFICATION_THEME_CHANGED: {
+			if (checkerboard != nullptr) {
+				checkerboard->set_texture(get_theme_icon(SNAME("GuiMiniCheckerboard"), EditorStringName(EditorIcons)));
+			}
+		} break;
 		case NOTIFICATION_DRAW: {
 			Vector<Vector2> points = {
 				Vector2(),

editor/plugins/visual_shader_editor_plugin.h

@@ -107,6 +107,7 @@ private:
 	};
 
 	struct Port {
+		VisualShaderNode::PortType type = VisualShaderNode::PORT_TYPE_SCALAR;
 		TextureButton *preview_button = nullptr;
 	};
 
@@ -141,7 +142,7 @@ public:
 	void register_shader(VisualShader *p_visual_shader);
 	void set_connections(const List<VisualShader::Connection> &p_connections);
 	void register_link(VisualShader::Type p_type, int p_id, VisualShaderNode *p_visual_node, GraphElement *p_graph_element);
-	void register_output_port(int p_id, int p_port, TextureButton *p_button);
+	void register_output_port(int p_id, int p_port, VisualShaderNode::PortType p_port_type, TextureButton *p_button);
 	void register_parameter_name(int p_id, LineEdit *p_parameter_name);
 	void register_default_input_button(int p_node_id, int p_port_id, Button *p_button);
 	void register_expression_edit(int p_node_id, CodeEdit *p_expression_edit);
@@ -680,6 +681,7 @@ public:
 
 class VisualShaderNodePortPreview : public Control {
 	GDCLASS(VisualShaderNodePortPreview, Control);
+	TextureRect *checkerboard = nullptr;
 	Ref<VisualShader> shader;
 	Ref<ShaderMaterial> preview_mat;
 	VisualShader::Type type = VisualShader::Type::TYPE_MAX;
@@ -692,7 +694,7 @@ protected:
 
 public:
 	virtual Size2 get_minimum_size() const override;
-	void setup(const Ref<VisualShader> &p_shader, Ref<ShaderMaterial> &p_preview_material, VisualShader::Type p_type, int p_node, int p_port, bool p_is_valid);
+	void setup(const Ref<VisualShader> &p_shader, Ref<ShaderMaterial> &p_preview_material, VisualShader::Type p_type, bool p_has_transparency, int p_node, int p_port, bool p_is_valid);
 };
 
 class VisualShaderConversionPlugin : public EditorResourceConversionPlugin {

scene/resources/visual_shader.cpp

@@ -1560,7 +1560,7 @@ String VisualShader::generate_preview_shader(Type p_type, int p_node, int p_port
 			shader_code += "	COLOR.rgb = n_out" + itos(p_node) + "p" + itos(p_port) + ";\n";
 		} break;
 		case VisualShaderNode::PORT_TYPE_VECTOR_4D: {
-			shader_code += "	COLOR.rgb = n_out" + itos(p_node) + "p" + itos(p_port) + ".xyz;\n";
+			shader_code += "	COLOR = n_out" + itos(p_node) + "p" + itos(p_port) + ";\n";
 		} break;
 		default: {
 			shader_code += "	COLOR.rgb = vec3(0.0);\n";