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+// MIT License
+
+// Copyright (c) 2019 Erin Catto
+
+// 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 B2_ROPE_H
+#define B2_ROPE_H
+
+#include "b2_api.h"
+#include "b2_math.h"
+
+class b2Draw;
+struct b2RopeStretch;
+struct b2RopeBend;
+
+enum b2StretchingModel
+{
+ b2_pbdStretchingModel,
+ b2_xpbdStretchingModel
+};
+
+enum b2BendingModel
+{
+ b2_springAngleBendingModel = 0,
+ b2_pbdAngleBendingModel,
+ b2_xpbdAngleBendingModel,
+ b2_pbdDistanceBendingModel,
+ b2_pbdHeightBendingModel,
+ b2_pbdTriangleBendingModel
+};
+
+///
+struct B2_API b2RopeTuning
+{
+ b2RopeTuning()
+ {
+ stretchingModel = b2_pbdStretchingModel;
+ bendingModel = b2_pbdAngleBendingModel;
+ damping = 0.0f;
+ stretchStiffness = 1.0f;
+ bendStiffness = 0.5f;
+ bendHertz = 1.0f;
+ bendDamping = 0.0f;
+ isometric = false;
+ fixedEffectiveMass = false;
+ warmStart = false;
+ }
+
+ b2StretchingModel stretchingModel;
+ b2BendingModel bendingModel;
+ float damping;
+ float stretchStiffness;
+ float stretchHertz;
+ float stretchDamping;
+ float bendStiffness;
+ float bendHertz;
+ float bendDamping;
+ bool isometric;
+ bool fixedEffectiveMass;
+ bool warmStart;
+};
+
+///
+struct B2_API b2RopeDef
+{
+ b2RopeDef()
+ {
+ position.SetZero();
+ vertices = nullptr;
+ count = 0;
+ masses = nullptr;
+ gravity.SetZero();
+ }
+
+ b2Vec2 position;
+ b2Vec2* vertices;
+ int32 count;
+ float* masses;
+ b2Vec2 gravity;
+ b2RopeTuning tuning;
+};
+
+///
+class B2_API b2Rope
+{
+public:
+ b2Rope();
+ ~b2Rope();
+
+ ///
+ void Create(const b2RopeDef& def);
+
+ ///
+ void SetTuning(const b2RopeTuning& tuning);
+
+ ///
+ void Step(float timeStep, int32 iterations, const b2Vec2& position);
+
+ ///
+ void Reset(const b2Vec2& position);
+
+ ///
+ void Draw(b2Draw* draw) const;
+
+private:
+
+ void SolveStretch_PBD();
+ void SolveStretch_XPBD(float dt);
+ void SolveBend_PBD_Angle();
+ void SolveBend_XPBD_Angle(float dt);
+ void SolveBend_PBD_Distance();
+ void SolveBend_PBD_Height();
+ void SolveBend_PBD_Triangle();
+ void ApplyBendForces(float dt);
+
+ b2Vec2 m_position;
+
+ int32 m_count;
+ int32 m_stretchCount;
+ int32 m_bendCount;
+
+ b2RopeStretch* m_stretchConstraints;
+ b2RopeBend* m_bendConstraints;
+
+ b2Vec2* m_bindPositions;
+ b2Vec2* m_ps;
+ b2Vec2* m_p0s;
+ b2Vec2* m_vs;
+
+ float* m_invMasses;
+ b2Vec2 m_gravity;
+
+ b2RopeTuning m_tuning;
+};
+
+#endif