add a small framework of garments, update the related tests

include/bounce/dynamics/cloth/cloth_mesh.h

@@ -0,0 +1,69 @@
+/*
+* Copyright (c) 2016-2016 Irlan Robson http://www.irlan.net
+*
+* This software is provided 'as-is', without any express or implied
+* warranty.  In no event will the authors be held liable for any damages
+* arising from the use of this software.
+* Permission is granted to anyone to use this software for any purpose,
+* including commercial applications, and to alter it and redistribute it
+* freely, subject to the following restrictions:
+* 1. The origin of this software must not be misrepresented; you must not
+* claim that you wrote the original software. If you use this software
+* in a product, an acknowledgment in the product documentation would be
+* appreciated but is not required.
+* 2. Altered source versions must be plainly marked as such, and must not be
+* misrepresented as being the original software.
+* 3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef B3_CLOTH_MESH_H
+#define B3_CLOTH_MESH_H
+
+#include <bounce/common/math/vec2.h>
+#include <bounce/common/math/vec3.h>
+
+struct b3ClothMeshTriangle
+{
+	u32 v1, v2, v3;
+};
+
+struct b3ClothMeshMesh
+{
+	u32 vertexCount;
+	u32 startVertex;
+	u32 triangleCount;
+	u32 startTriangle;
+};
+
+struct b3ClothMeshSewingLine
+{
+	u32 s1, s2;
+	u32 v1, v2;
+};
+
+struct b3ClothMesh
+{
+	u32 vertexCount;
+	b3Vec3* vertices;
+	u32 triangleCount;
+	b3ClothMeshTriangle* triangles;
+	u32 meshCount;
+	b3ClothMeshMesh* meshes;
+	u32 sewingLineCount;
+	b3ClothMeshSewingLine* sewingLines;
+};
+
+struct b3GarmentMesh;
+
+// Convenience structure.
+struct b3GarmentClothMesh : public b3ClothMesh
+{
+	b3GarmentClothMesh();
+	~b3GarmentClothMesh();
+
+	// Maps a given garment mesh to this mesh.
+	// This garment mesh must be empty.
+	void Set(const b3GarmentMesh* garment);
+};
+
+#endif

include/bounce/dynamics/cloth/spring_cloth.h

@@ -29,7 +29,7 @@ class b3StackAllocator;
 
 class b3Shape;
 
-struct b3Mesh;
+struct b3ClothMesh;
 
 struct b3SpringClothDef
 {
@@ -49,7 +49,7 @@ struct b3SpringClothDef
 	b3StackAllocator* allocator;
 
 	// Cloth mesh	
-	b3Mesh* mesh;
+	b3ClothMesh* mesh;
 
 	// Cloth density in kg/m^3
 	float32 density;
@@ -64,8 +64,8 @@ struct b3SpringClothDef
 	float32 kd;
 	
 	// Mass radius
-	// Typically this is value is small and is intended for correcting visual artifacts when 
-	// the cloth is colliding against a solid.
+	// This should be a small value. It can be used for correcting visual artifacts when 
+	// the masses are colliding against a solid.
 	float32 r;
 	
 	// Acceleration due to gravity (m/s^2)
@@ -75,7 +75,8 @@ struct b3SpringClothDef
 enum b3SpringType
 {
 	e_strechSpring,
-	e_bendSpring
+	e_bendSpring,
+	// e_sewingSpring
 };
 
 struct b3Spring
@@ -138,7 +139,7 @@ public:
 	void Initialize(const b3SpringClothDef& def);
 
 	// Return the cloth mesh used to initialize this cloth.
-	b3Mesh* GetMesh() const;
+	b3ClothMesh* GetMesh() const;
 
 	// Set the gravitational acceleration applied to this cloth.
 	// Units are m/s^2.
@@ -210,7 +211,7 @@ protected:
 
 	b3StackAllocator* m_allocator;
 
-	b3Mesh* m_mesh;
+	b3ClothMesh* m_mesh;
 	float32 m_r;
 
 	b3Vec3 m_gravity;
@@ -237,7 +238,7 @@ protected:
 	b3SpringClothStep m_step;
 };
 
-inline b3Mesh* b3SpringCloth::GetMesh() const
+inline b3ClothMesh* b3SpringCloth::GetMesh() const
 {
 	return m_mesh;
 }