Mesh generation to everybody

Add cylinder mesh generation
Mesh generation can be used by everyone
Mesh generation also gives vertex normals for convenience

include/bounce/meshgen/cylinder_mesh.h

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+/*
+* Copyright (c) 2016-2019 Irlan Robson https://irlanrobson.github.io
+*
+* 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 CYM_MESH_H
+#define CYM_MESH_H
+
+#include <bounce/common/math/vec3.h>
+
+// This structure represents a triangle mesh.
+struct cymMesh
+{
+	cymMesh()
+	{
+		vertexCount = 0;
+		vertices = nullptr;
+		normals = nullptr;
+		indexCount = 0;
+		indices = nullptr;
+	}
+
+	~cymMesh()
+	{
+		b3Free(vertices);
+		b3Free(normals);
+		b3Free(indices);
+	}
+
+	u32 vertexCount; // number of unique vertices
+	b3Vec3* vertices; // list of unique vertices
+	b3Vec3* normals; // list of vertex normals
+	u32 indexCount; // number of triangle vertex indices
+	u32* indices; // list of triangle vertex index
+};
+
+// Create a unit cylinder along the y-axis given the number of segments.
+// The number of segments must be greater than 2.
+void cymCreateMesh(cymMesh& output, u32 segments);
+
+#endif

include/bounce/meshgen/sphere_mesh.h

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+/*
+* Copyright (c) 2016-2019 Irlan Robson https://irlanrobson.github.io
+*
+* 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 SM_MESH_H
+#define SM_MESH_H
+
+#include <bounce/common/math/vec3.h>
+
+// This structure represents a triangle mesh.
+struct smMesh
+{
+	smMesh()
+	{
+		vertexCount = 0;
+		vertices = nullptr;
+		normals = nullptr;
+		indexCount = 0;
+		indices = nullptr;
+	}
+
+	~smMesh()
+	{
+		b3Free(vertices);
+		b3Free(normals);
+		b3Free(indices);
+	}
+
+	u32 vertexCount; // number of unique vertices
+	b3Vec3* vertices; // list of unique vertices
+	b3Vec3* normals; // list of vertex normals
+	u32 indexCount; // number of triangle vertex indices
+	u32* indices; // list of triangle vertex index
+};
+
+// Create a unit icosphere given the number of subdivisions.
+// If the number of subdivisions to perform is zero then the output mesh is an octahedron.
+void smCreateMesh(smMesh& output, u32 subdivisions);
+
+#endif