add hello world example and edit source tree

examples/testbed/tests/cloth_test.h

@@ -0,0 +1,79 @@
+/*
+* 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 CLOTH_H
+#define CLOTH_H
+
+extern DebugDraw* g_debugDraw;
+extern Camera g_camera;
+extern Settings g_settings;
+
+class Cloth : public Test
+{
+public:
+	Cloth()
+	{
+		g_camera.m_zoom = 25.0f;
+
+		b3ClothDef def;
+		def.mesh = m_meshes + e_clothMesh;
+		def.density = 0.2f;
+		def.gravity.Set(-10.0f, 1.0f, 0.0f);
+		def.k1 = 0.5f;
+		def.k2 = 0.05f;
+		def.kd = 0.1f;
+		def.r = 1.0f;
+
+		m_cloth.Initialize(def);
+
+		b3Particle* vs = m_cloth.GetVertices();
+		for (u32 i = 0; i < 5; ++i)
+		{
+			vs[i].im = 0.0f;
+		}
+	}
+
+	void Step()
+	{
+		float32 dt = g_settings.hertz > 0.0f ? 1.0f / g_settings.hertz : 0.0f;
+		
+		if (g_settings.pause)
+		{
+			if (g_settings.singleStep)
+				{
+				g_settings.singleStep = false;
+			}
+			else
+			{
+				dt = 0.0f;
+			}
+		}
+
+		m_cloth.Step(dt, g_settings.positionIterations);
+		m_cloth.Draw(g_debugDraw);
+	}
+
+	static Test* Create()
+	{
+		return new Cloth();
+	}
+
+	b3Cloth m_cloth;
+};
+
+#endif