加入5套spine官方运行时

DateToSpine/third_party/spine-runtimes/4.3/spine-cpp/src/spine/Interpolation.cpp

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+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated April 5, 2025. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2025, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+#include <spine/Interpolation.h>
+#include <spine/MathUtil.h>
+
+using namespace spine;
+
+namespace {
+	class LinearInterpolation : public Interpolation {
+	public:
+		float apply(float a) override {
+			return a;
+		}
+	};
+
+	class SmoothInterpolation : public Interpolation {
+	public:
+		float apply(float a) override {
+			return a * a * (3 - 2 * a);
+		}
+	};
+
+	class SlowFastInterpolation : public Interpolation {
+	public:
+		float apply(float a) override {
+			return a * a;
+		}
+	};
+
+	class FastSlowInterpolation : public Interpolation {
+	public:
+		float apply(float a) override {
+			return (a - 1) * (a - 1) * -1 + 1;
+		}
+	};
+
+	class CircleInterpolation : public Interpolation {
+	public:
+		float apply(float a) override {
+			if (a <= 0.5f) {
+				a *= 2;
+				return (1 - MathUtil::sqrt(1 - a * a)) / 2;
+			}
+			a--;
+			a *= 2;
+			return (MathUtil::sqrt(1 - a * a) + 1) / 2;
+		}
+	};
+}
+
+Interpolation::~Interpolation() {
+}
+
+float Interpolation::apply(float a) {
+	return a;
+}
+
+float Interpolation::apply(float start, float end, float a) {
+	return start + (end - start) * apply(a);
+}
+
+Interpolation &Interpolation::linear() {
+	static LinearInterpolation interpolation;
+	return interpolation;
+}
+
+Interpolation &Interpolation::smooth() {
+	static SmoothInterpolation interpolation;
+	return interpolation;
+}
+
+Interpolation &Interpolation::slowFast() {
+	static SlowFastInterpolation interpolation;
+	return interpolation;
+}
+
+Interpolation &Interpolation::fastSlow() {
+	static FastSlowInterpolation interpolation;
+	return interpolation;
+}
+
+Interpolation &Interpolation::circle() {
+	static CircleInterpolation interpolation;
+	return interpolation;
+}