1 files changed, 129 insertions, 0 deletions
diff --git a/scene/resources/gradient.h b/scene/resources/gradient.h
new file mode 100644
index 0000000000..7e7fc99a5d
--- /dev/null
+++ b/scene/resources/gradient.h
@@ -0,0 +1,129 @@
+/*************************************************************************/
+/*  gradient.h                                                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef GRADIENT_H
+#define GRADIENT_H
+
+#include "core/resource.h"
+
+class Gradient : public Resource {
+	GDCLASS(Gradient, Resource);
+	OBJ_SAVE_TYPE(Gradient);
+
+public:
+	struct Point {
+
+		float offset;
+		Color color;
+		bool operator<(const Point &p_ponit) const {
+			return offset < p_ponit.offset;
+		}
+	};
+
+private:
+	Vector<Point> points;
+	bool is_sorted;
+
+protected:
+	static void _bind_methods();
+
+public:
+	Gradient();
+	virtual ~Gradient();
+
+	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 set_offset(int pos, const float offset);
+	float get_offset(int pos) const;
+
+	void set_color(int pos, const Color &color);
+	Color get_color(int pos) const;
+
+	void set_offsets(const Vector<float> &p_offsets);
+	Vector<float> get_offsets() const;
+
+	void set_colors(const Vector<Color> &p_colors);
+	Vector<Color> get_colors() const;
+
+	_FORCE_INLINE_ Color get_color_at_offset(float p_offset) {
+
+		if (points.empty())
+			return Color(0, 0, 0, 1);
+
+		if (!is_sorted) {
+			points.sort();
+			is_sorted = true;
+		}
+
+		//binary search
+		int low = 0;
+		int high = points.size() - 1;
+		int middle = 0;
+
+#ifdef DEBUG_ENABLED
+		if (low > high)
+			ERR_PRINT("low > high, this may be a bug");
+#endif
+
+		while (low <= high) {
+			middle = (low + high) / 2;
+			const Point &point = points[middle];
+			if (point.offset > p_offset) {
+				high = middle - 1; //search low end of array
+			} else if (point.offset < p_offset) {
+				low = middle + 1; //search high end of array
+			} else {
+				return point.color;
+			}
+		}
+
+		//return interpolated value
+		if (points[middle].offset > p_offset) {
+			middle--;
+		}
+		int first = middle;
+		int second = middle + 1;
+		if (second >= points.size())
+			return points[points.size() - 1].color;
+		if (first < 0)
+			return points[0].color;
+		const Point &pointFirst = points[first];
+		const Point &pointSecond = points[second];
+		return pointFirst.color.linear_interpolate(pointSecond.color, (p_offset - pointFirst.offset) / (pointSecond.offset - pointFirst.offset));
+	}
+
+	int get_points_count() const;
+};
+
+#endif // GRADIENT_H