Merge pull request #53321 from Geometror/gradient-improvements

doc/classes/Gradient.xml

@@ -51,6 +51,12 @@
 				Removes the color at the index [code]point[/code].
 			</description>
 		</method>
+		<method name="reverse">
+			<return type="void" />
+			<description>
+				Reverses/mirrors the gradient.
+			</description>
+		</method>
 		<method name="set_color">
 			<return type="void" />
 			<argument index="0" name="point" type="int" />
@@ -72,8 +78,22 @@
 		<member name="colors" type="PackedColorArray" setter="set_colors" getter="get_colors" default="PackedColorArray(0, 0, 0, 1, 1, 1, 1, 1)">
 			Gradient's colors returned as a [PackedColorArray].
 		</member>
+		<member name="interpolation_mode" type="int" setter="set_interpolation_mode" getter="get_interpolation_mode" enum="Gradient.InterpolationMode" default="0">
+			Defines how the colors between points of the gradient are interpolated. See [enum InterpolationMode] for available modes.
+		</member>
 		<member name="offsets" type="PackedFloat32Array" setter="set_offsets" getter="get_offsets" default="PackedFloat32Array(0, 1)">
 			Gradient's offsets returned as a [PackedFloat32Array].
 		</member>
 	</members>
+	<constants>
+		<constant name="GRADIENT_INTERPOLATE_LINEAR" value="0" enum="InterpolationMode">
+			Linear interpolation.
+		</constant>
+		<constant name="GRADIENT_INTERPOLATE_CONSTANT" value="1" enum="InterpolationMode">
+			Constant interpolation, color changes abruptly at each point and stays uniform between. This might cause visible aliasing when used for a gradient texture in some cases.
+		</constant>
+		<constant name="GRADIENT_INTERPOLATE_CUBIC" value="2" enum="InterpolationMode">
+			Cubic interpolation.
+		</constant>
+	</constants>
 </class>

editor/icons/ReverseGradient.svg

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><svg version="1.1" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><linearGradient id="b" x1=".26458" x2="3.9688" y1=".79375" y2=".79375" gradientTransform="scale(3.7795)" gradientUnits="userSpaceOnUse"><stop stop-color="#ccc" offset="0"/><stop stop-color="#ccc" stop-opacity="0" offset="1"/></linearGradient><linearGradient id="a" x1=".26458" x2="3.9688" y1="3.4396" y2="3.4396" gradientTransform="matrix(3.7795 0 0 3.7795 -16 -1.1865e-7)" gradientUnits="userSpaceOnUse"><stop stop-color="#ccc" offset="0"/><stop stop-color="#ccc" stop-opacity="0" offset="1"/></linearGradient></defs><g><rect x="1" y="1" width="14" height="4" ry="1" fill="url(#b)"/><rect transform="scale(-1,1)" x="-15" y="11" width="14" height="4" ry="1" fill="url(#a)" stroke-linecap="round" stroke-linejoin="round" stroke-width="3.7795"/><path d="m6 6 2 4 2-4z" fill="#ccc"/></g></svg>

editor/plugins/gradient_editor_plugin.cpp

@@ -46,6 +46,8 @@ void GradientEditor::_gradient_changed() {
 	editing = true;
 	Vector<Gradient::Point> points = gradient->get_points();
 	set_points(points);
+	set_interpolation_mode(gradient->get_interpolation_mode());
+	update();
 	editing = false;
 }
 
@@ -55,8 +57,10 @@ void GradientEditor::_ramp_changed() {
 	undo_redo->create_action(TTR("Gradient Edited"));
 	undo_redo->add_do_method(gradient.ptr(), "set_offsets", get_offsets());
 	undo_redo->add_do_method(gradient.ptr(), "set_colors", get_colors());
+	undo_redo->add_do_method(gradient.ptr(), "set_interpolation_mode", get_interpolation_mode());
 	undo_redo->add_undo_method(gradient.ptr(), "set_offsets", gradient->get_offsets());
 	undo_redo->add_undo_method(gradient.ptr(), "set_colors", gradient->get_colors());
+	undo_redo->add_undo_method(gradient.ptr(), "set_interpolation_mode", gradient->get_interpolation_mode());
 	undo_redo->commit_action();
 	editing = false;
 }
@@ -69,6 +73,14 @@ void GradientEditor::set_gradient(const Ref<Gradient> &p_gradient) {
 	connect("ramp_changed", callable_mp(this, &GradientEditor::_ramp_changed));
 	gradient->connect("changed", callable_mp(this, &GradientEditor::_gradient_changed));
 	set_points(gradient->get_points());
+	set_interpolation_mode(gradient->get_interpolation_mode());
+}
+
+void GradientEditor::reverse_gradient() {
+	gradient->reverse();
+	set_points(gradient->get_points());
+	emit_signal(SNAME("ramp_changed"));
+	update();
 }
 
 GradientEditor::GradientEditor() {
@@ -77,6 +89,23 @@ GradientEditor::GradientEditor() {
 
 ///////////////////////
 
+void GradientReverseButton::_notification(int p_what) {
+	if (p_what == NOTIFICATION_DRAW) {
+		Ref<Texture2D> icon = get_theme_icon(SNAME("ReverseGradient"), SNAME("EditorIcons"));
+		if (is_pressed()) {
+			draw_texture_rect(icon, Rect2(margin, margin, icon->get_width(), icon->get_height()), false, get_theme_color(SNAME("icon_pressed_color"), SNAME("Button")));
+		} else {
+			draw_texture_rect(icon, Rect2(margin, margin, icon->get_width(), icon->get_height()));
+		}
+	}
+}
+
+Size2 GradientReverseButton::get_minimum_size() const {
+	return (get_theme_icon(SNAME("ReverseGradient"), SNAME("EditorIcons"))->get_size() + Size2(margin * 2, margin * 2));
+}
+
+///////////////////////
+
 bool EditorInspectorPluginGradient::can_handle(Object *p_object) {
 	return Object::cast_to<Gradient>(p_object) != nullptr;
 }
@@ -85,9 +114,23 @@ void EditorInspectorPluginGradient::parse_begin(Object *p_object) {
 	Gradient *gradient = Object::cast_to<Gradient>(p_object);
 	Ref<Gradient> g(gradient);
 
-	GradientEditor *editor = memnew(GradientEditor);
+	editor = memnew(GradientEditor);
 	editor->set_gradient(g);
 	add_custom_control(editor);
+
+	reverse_btn = memnew(GradientReverseButton);
+
+	gradient_tools_hbox = memnew(HBoxContainer);
+	gradient_tools_hbox->add_child(reverse_btn);
+
+	add_custom_control(gradient_tools_hbox);
+
+	reverse_btn->connect("pressed", callable_mp(this, &EditorInspectorPluginGradient::_reverse_button_pressed));
+	reverse_btn->set_tooltip(TTR("Reverse/mirror gradient."));
+}
+
+void EditorInspectorPluginGradient::_reverse_button_pressed() {
+	editor->reverse_gradient();
 }
 
 GradientEditorPlugin::GradientEditorPlugin(EditorNode *p_node) {

editor/plugins/gradient_editor_plugin.h

@@ -50,12 +50,28 @@ protected:
 public:
 	virtual Size2 get_minimum_size() const override;
 	void set_gradient(const Ref<Gradient> &p_gradient);
+	void reverse_gradient();
 	GradientEditor();
 };
 
+class GradientReverseButton : public BaseButton {
+	GDCLASS(GradientReverseButton, BaseButton);
+
+	int margin = 2;
+
+	void _notification(int p_what);
+	virtual Size2 get_minimum_size() const override;
+};
+
 class EditorInspectorPluginGradient : public EditorInspectorPlugin {
 	GDCLASS(EditorInspectorPluginGradient, EditorInspectorPlugin);
 
+	GradientEditor *editor;
+	HBoxContainer *gradient_tools_hbox;
+	GradientReverseButton *reverse_btn;
+
+	void _reverse_button_pressed();
+
 public:
 	virtual bool can_handle(Object *p_object) override;
 	virtual void parse_begin(Object *p_object) override;

scene/gui/gradient_edit.cpp

@@ -39,6 +39,10 @@ GradientEdit::GradientEdit() {
 	picker = memnew(ColorPicker);
 	popup->add_child(picker);
 
+	gradient_cache.instantiate();
+	preview_texture.instantiate();
+
+	preview_texture->set_width(1024);
 	add_child(popup, false, INTERNAL_MODE_FRONT);
 }
 
@@ -47,7 +51,7 @@ int GradientEdit::_get_point_from_pos(int x) {
 	int total_w = get_size().width - get_size().height - draw_spacing;
 	float min_distance = 1e20;
 	for (int i = 0; i < points.size(); i++) {
-		//Check if we clicked at point
+		// Check if we clicked at point.
 		float distance = ABS(x - points[i].offset * total_w);
 		float min = (draw_point_width / 2 * 1.7); //make it easier to grab
 		if (distance <= min && distance < min_distance) {
@@ -94,14 +98,14 @@ void GradientEdit::gui_input(const Ref<InputEvent> &p_event) {
 	}
 
 	Ref<InputEventMouseButton> mb = p_event;
-	//Show color picker on double click.
+	// Show color picker on double click.
 	if (mb.is_valid() && mb->get_button_index() == 1 && mb->is_double_click() && mb->is_pressed()) {
 		grabbed = _get_point_from_pos(mb->get_position().x);
 		_show_color_picker();
 		accept_event();
 	}
 
-	//Delete point on right click
+	// Delete point on right click.
 	if (mb.is_valid() && mb->get_button_index() == 2 && mb->is_pressed()) {
 		grabbed = _get_point_from_pos(mb->get_position().x);
 		if (grabbed != -1) {
@@ -114,20 +118,20 @@ void GradientEdit::gui_input(const Ref<InputEvent> &p_event) {
 		}
 	}
 
-	//Hold alt key to duplicate selected color
+	// Hold alt key to duplicate selected color.
 	if (mb.is_valid() && mb->get_button_index() == 1 && mb->is_pressed() && mb->is_alt_pressed()) {
 		int x = mb->get_position().x;
 		grabbed = _get_point_from_pos(x);
 
 		if (grabbed != -1) {
 			int total_w = get_size().width - get_size().height - draw_spacing;
-			Gradient::Point newPoint = points[grabbed];
-			newPoint.offset = CLAMP(x / float(total_w), 0, 1);
+			Gradient::Point new_point = points[grabbed];
+			new_point.offset = CLAMP(x / float(total_w), 0, 1);
 
-			points.push_back(newPoint);
+			points.push_back(new_point);
 			points.sort();
 			for (int i = 0; i < points.size(); ++i) {
-				if (points[i].offset == newPoint.offset) {
+				if (points[i].offset == new_point.offset) {
 					grabbed = i;
 					break;
 				}
@@ -138,7 +142,7 @@ void GradientEdit::gui_input(const Ref<InputEvent> &p_event) {
 		}
 	}
 
-	//select
+	// Select.
 	if (mb.is_valid() && mb->get_button_index() == 1 && mb->is_pressed()) {
 		update();
 		int x = mb->get_position().x;
@@ -158,16 +162,16 @@ void GradientEdit::gui_input(const Ref<InputEvent> &p_event) {
 			return;
 		}
 
-		//insert
-		Gradient::Point newPoint;
-		newPoint.offset = CLAMP(x / float(total_w), 0, 1);
+		// Insert point.
+		Gradient::Point new_point;
+		new_point.offset = CLAMP(x / float(total_w), 0, 1);
 
 		Gradient::Point prev;
 		Gradient::Point next;
 
 		int pos = -1;
 		for (int i = 0; i < points.size(); i++) {
-			if (points[i].offset < newPoint.offset) {
+			if (points[i].offset < new_point.offset) {
 				pos = i;
 			}
 		}
@@ -191,12 +195,12 @@ void GradientEdit::gui_input(const Ref<InputEvent> &p_event) {
 			prev = points[pos];
 		}
 
-		newPoint.color = prev.color.lerp(next.color, (newPoint.offset - prev.offset) / (next.offset - prev.offset));
+		new_point.color = prev.color.lerp(next.color, (new_point.offset - prev.offset) / (next.offset - prev.offset));
 
-		points.push_back(newPoint);
+		points.push_back(new_point);
 		points.sort();
 		for (int i = 0; i < points.size(); i++) {
-			if (points[i].offset == newPoint.offset) {
+			if (points[i].offset == new_point.offset) {
 				grabbed = i;
 				break;
 			}
@@ -223,7 +227,7 @@ void GradientEdit::gui_input(const Ref<InputEvent> &p_event) {
 		float newofs = CLAMP(x / float(total_w), 0, 1);
 
 		// Snap to "round" coordinates if holding Ctrl.
-		// Be more precise if holding Shift as well
+		// Be more precise if holding Shift as well.
 		if (mm->is_ctrl_pressed()) {
 			newofs = Math::snapped(newofs, mm->is_shift_pressed() ? 0.025 : 0.1);
 		} else if (mm->is_shift_pressed()) {
@@ -299,57 +303,22 @@ void GradientEdit::_notification(int p_what) {
 		int h = get_size().y;
 
 		if (w == 0 || h == 0) {
-			return; //Safety check. We have division by 'h'. And in any case there is nothing to draw with such size
+			return; // Safety check. We have division by 'h'. And in any case there is nothing to draw with such size.
 		}
 
 		int total_w = get_size().width - get_size().height - draw_spacing;
 
-		//Draw checker pattern for ramp
+		// Draw checker pattern for ramp.
 		draw_texture_rect(get_theme_icon(SNAME("GuiMiniCheckerboard"), SNAME("EditorIcons")), Rect2(0, 0, total_w, h), true);
 
-		//Draw color ramp
-		Gradient::Point prev;
-		prev.offset = 0;
-		if (points.size() == 0) {
-			prev.color = Color(0, 0, 0); //Draw black rectangle if we have no points
-		} else {
-			prev.color = points[0].color; //Extend color of first point to the beginning.
-		}
+		// Draw color ramp.
 
-		for (int i = -1; i < points.size(); i++) {
-			Gradient::Point next;
-			//If there is no next point
-			if (i + 1 == points.size()) {
-				if (points.size() == 0) {
-					next.color = Color(0, 0, 0); //Draw black rectangle if we have no points
-				} else {
-					next.color = points[i].color; //Extend color of last point to the end.
-				}
-				next.offset = 1;
-			} else {
-				next = points[i + 1];
-			}
+		gradient_cache->set_points(points);
+		gradient_cache->set_interpolation_mode(interpolation_mode);
+		preview_texture->set_gradient(gradient_cache);
+		draw_texture_rect(preview_texture, Rect2(0, 0, total_w, h));
 
-			if (prev.offset == next.offset) {
-				prev = next;
-				continue;
-			}
-
-			Vector<Vector2> points;
-			Vector<Color> colors;
-			points.push_back(Vector2(prev.offset * total_w, h));
-			points.push_back(Vector2(prev.offset * total_w, 0));
-			points.push_back(Vector2(next.offset * total_w, 0));
-			points.push_back(Vector2(next.offset * total_w, h));
-			colors.push_back(prev.color);
-			colors.push_back(prev.color);
-			colors.push_back(next.color);
-			colors.push_back(next.color);
-			draw_primitive(points, colors, Vector<Point2>());
-			prev = next;
-		}
-
-		//Draw point markers
+		// Draw point markers.
 		for (int i = 0; i < points.size(); i++) {
 			Color col = points[i].color.inverted();
 			col.a = 0.9;
@@ -383,7 +352,7 @@ void GradientEdit::_notification(int p_what) {
 			draw_line(Vector2(total_w + draw_spacing, h), Vector2(total_w + draw_spacing + h, 0), Color(1, 1, 1, 0.6));
 		}
 
-		//Draw borders around color ramp if in focus
+		// Draw borders around color ramp if in focus.
 		if (has_focus()) {
 			draw_line(Vector2(-1, -1), Vector2(total_w + 1, -1), Color(1, 1, 1, 0.6));
 			draw_line(Vector2(total_w + 1, -1), Vector2(total_w + 1, h + 1), Color(1, 1, 1, 0.6));
@@ -448,12 +417,21 @@ void GradientEdit::set_points(Vector<Gradient::Point> &p_points) {
 	}
 	points.clear();
 	points = p_points;
+	points.sort();
 }
 
 Vector<Gradient::Point> &GradientEdit::get_points() {
 	return points;
 }
 
+void GradientEdit::set_interpolation_mode(Gradient::InterpolationMode p_interp_mode) {
+	interpolation_mode = p_interp_mode;
+}
+
+Gradient::InterpolationMode GradientEdit::get_interpolation_mode() {
+	return interpolation_mode;
+}
+
 void GradientEdit::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("ramp_changed"));
 }

scene/gui/gradient_edit.h

@@ -45,6 +45,10 @@ class GradientEdit : public Control {
 	bool grabbing = false;
 	int grabbed = -1;
 	Vector<Gradient::Point> points;
+	Gradient::InterpolationMode interpolation_mode = Gradient::GRADIENT_INTERPOLATE_LINEAR;
+
+	Ref<Gradient> gradient_cache;
+	Ref<GradientTexture1D> preview_texture;
 
 	// Make sure to use the scaled value below.
 	const int BASE_SPACING = 3;
@@ -69,6 +73,9 @@ public:
 	Vector<Color> get_colors() const;
 	void set_points(Vector<Gradient::Point> &p_points);
 	Vector<Gradient::Point> &get_points();
+	void set_interpolation_mode(Gradient::InterpolationMode p_interp_mode);
+	Gradient::InterpolationMode get_interpolation_mode();
+
 	virtual Size2 get_minimum_size() const override;
 
 	GradientEdit();

scene/resources/gradient.cpp

@@ -51,6 +51,8 @@ void Gradient::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_offset", "point", "offset"), &Gradient::set_offset);
 	ClassDB::bind_method(D_METHOD("get_offset", "point"), &Gradient::get_offset);
 
+	ClassDB::bind_method(D_METHOD("reverse"), &Gradient::reverse);
+
 	ClassDB::bind_method(D_METHOD("set_color", "point", "color"), &Gradient::set_color);
 	ClassDB::bind_method(D_METHOD("get_color", "point"), &Gradient::get_color);
 
@@ -64,8 +66,18 @@ void Gradient::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_colors", "colors"), &Gradient::set_colors);
 	ClassDB::bind_method(D_METHOD("get_colors"), &Gradient::get_colors);
 
+	ClassDB::bind_method(D_METHOD("set_interpolation_mode", "interpolation_mode"), &Gradient::set_interpolation_mode);
+	ClassDB::bind_method(D_METHOD("get_interpolation_mode"), &Gradient::get_interpolation_mode);
+
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "interpolation_mode", PROPERTY_HINT_ENUM, "Linear,Constant,Cubic"), "set_interpolation_mode", "get_interpolation_mode");
+
+	ADD_GROUP("Raw data", "");
 	ADD_PROPERTY(PropertyInfo(Variant::PACKED_FLOAT32_ARRAY, "offsets"), "set_offsets", "get_offsets");
 	ADD_PROPERTY(PropertyInfo(Variant::PACKED_COLOR_ARRAY, "colors"), "set_colors", "get_colors");
+
+	BIND_ENUM_CONSTANT(GRADIENT_INTERPOLATE_LINEAR);
+	BIND_ENUM_CONSTANT(GRADIENT_INTERPOLATE_CONSTANT);
+	BIND_ENUM_CONSTANT(GRADIENT_INTERPOLATE_CUBIC);
 }
 
 Vector<float> Gradient::get_offsets() const {
@@ -86,6 +98,15 @@ Vector<Color> Gradient::get_colors() const {
 	return colors;
 }
 
+void Gradient::set_interpolation_mode(Gradient::InterpolationMode p_interp_mode) {
+	interpolation_mode = p_interp_mode;
+	emit_signal(CoreStringNames::get_singleton()->changed);
+}
+
+Gradient::InterpolationMode Gradient::get_interpolation_mode() {
+	return interpolation_mode;
+}
+
 void Gradient::set_offsets(const Vector<float> &p_offsets) {
 	points.resize(p_offsets.size());
 	for (int i = 0; i < points.size(); i++) {
@@ -127,6 +148,15 @@ void Gradient::remove_point(int p_index) {
 	emit_signal(CoreStringNames::get_singleton()->changed);
 }
 
+void Gradient::reverse() {
+	for (int i = 0; i < points.size(); i++) {
+		points.write[i].offset = 1.0 - points[i].offset;
+	}
+
+	_update_sorting();
+	emit_signal(CoreStringNames::get_singleton()->changed);
+}
+
 void Gradient::set_points(Vector<Gradient::Point> &p_points) {
 	points = p_points;
 	is_sorted = false;

scene/resources/gradient.h

@@ -38,6 +38,12 @@ class Gradient : public Resource {
 	OBJ_SAVE_TYPE(Gradient);
 
 public:
+	enum InterpolationMode {
+		GRADIENT_INTERPOLATE_LINEAR,
+		GRADIENT_INTERPOLATE_CONSTANT,
+		GRADIENT_INTERPOLATE_CUBIC,
+	};
+
 	struct Point {
 		float offset = 0.0;
 		Color color;
@@ -49,6 +55,8 @@ public:
 private:
 	Vector<Point> points;
 	bool is_sorted = true;
+	InterpolationMode interpolation_mode = GRADIENT_INTERPOLATE_LINEAR;
+
 	_FORCE_INLINE_ void _update_sorting() {
 		if (!is_sorted) {
 			points.sort();
@@ -65,9 +73,9 @@ public:
 
 	void add_point(float p_offset, const Color &p_color);
 	void remove_point(int p_index);
-
 	void set_points(Vector<Point> &p_points);
 	Vector<Point> &get_points();
+	void reverse();
 
 	void set_offset(int pos, const float offset);
 	float get_offset(int pos);
@@ -81,6 +89,13 @@ public:
 	void set_colors(const Vector<Color> &p_colors);
 	Vector<Color> get_colors() const;
 
+	void set_interpolation_mode(InterpolationMode p_interp_mode);
+	InterpolationMode get_interpolation_mode();
+
+	_FORCE_INLINE_ float cubic_interpolate(float p0, float p1, float p2, float p3, float x) {
+		return p1 + 0.5 * x * (p2 - p0 + x * (2.0 * p0 - 5.0 * p1 + 4.0 * p2 - p3 + x * (3.0 * (p1 - p2) + p3 - p0)));
+	}
+
 	_FORCE_INLINE_ Color get_color_at_offset(float p_offset) {
 		if (points.is_empty()) {
 			return Color(0, 0, 0, 1);
@@ -88,7 +103,7 @@ public:
 
 		_update_sorting();
 
-		//binary search
+		// Binary search.
 		int low = 0;
 		int high = points.size() - 1;
 		int middle = 0;
@@ -111,7 +126,7 @@ public:
 			}
 		}
 
-		//return interpolated value
+		// Return interpolated value.
 		if (points[middle].offset > p_offset) {
 			middle--;
 		}
@@ -125,10 +140,44 @@ public:
 		}
 		const Point &pointFirst = points[first];
 		const Point &pointSecond = points[second];
-		return pointFirst.color.lerp(pointSecond.color, (p_offset - pointFirst.offset) / (pointSecond.offset - pointFirst.offset));
+
+		switch (interpolation_mode) {
+			case GRADIENT_INTERPOLATE_LINEAR: {
+				return pointFirst.color.lerp(pointSecond.color, (p_offset - pointFirst.offset) / (pointSecond.offset - pointFirst.offset));
+			} break;
+			case GRADIENT_INTERPOLATE_CONSTANT: {
+				return pointFirst.color;
+			} break;
+			case GRADIENT_INTERPOLATE_CUBIC: {
+				int p0 = first - 1;
+				int p3 = second + 1;
+				if (p3 >= points.size()) {
+					p3 = second;
+				}
+				if (p0 < 0) {
+					p0 = first;
+				}
+				const Point &pointP0 = points[p0];
+				const Point &pointP3 = points[p3];
+
+				float x = (p_offset - pointFirst.offset) / (pointSecond.offset - pointFirst.offset);
+				float r = cubic_interpolate(pointP0.color.r, pointFirst.color.r, pointSecond.color.r, pointP3.color.r, x);
+				float g = cubic_interpolate(pointP0.color.g, pointFirst.color.g, pointSecond.color.g, pointP3.color.g, x);
+				float b = cubic_interpolate(pointP0.color.b, pointFirst.color.b, pointSecond.color.b, pointP3.color.b, x);
+				float a = cubic_interpolate(pointP0.color.a, pointFirst.color.a, pointSecond.color.a, pointP3.color.a, x);
+
+				return Color(r, g, b, a);
+			} break;
+			default: {
+				// Fallback to linear interpolation.
+				return pointFirst.color.lerp(pointSecond.color, (p_offset - pointFirst.offset) / (pointSecond.offset - pointFirst.offset));
+			}
+		}
 	}
 
 	int get_points_count() const;
 };
 
+VARIANT_ENUM_CAST(Gradient::InterpolationMode);
+
 #endif // GRADIENT_H