Method cache

examples/ExampleBrowser/GL_ShapeDrawer.cpp:176–219

}

GL_ShapeDrawer::ShapeCache* GL_ShapeDrawer::cache(btConvexShape* shape)
{
	ShapeCache* sc = (ShapeCache*)shape->getUserPointer();
	if (!sc)
	{
		sc = new (btAlignedAlloc(sizeof(ShapeCache), 16)) ShapeCache(shape);
		sc->m_shapehull.buildHull(shape->getMargin());
		m_shapecaches.push_back(sc);
		shape->setUserPointer(sc);
		/* Build edges	*/
		const int ni = sc->m_shapehull.numIndices();
		const int nv = sc->m_shapehull.numVertices();
		const unsigned int* pi = sc->m_shapehull.getIndexPointer();
		const btVector3* pv = sc->m_shapehull.getVertexPointer();
		btAlignedObjectArray<ShapeCache::Edge*> edges;
		sc->m_edges.reserve(ni);
		edges.resize(nv * nv, 0);
		for (int i = 0; i < ni; i += 3)
		{
			const unsigned int* ti = pi + i;
			const btVector3 nrm = btCross(pv[ti[1]] - pv[ti[0]], pv[ti[2]] - pv[ti[0]]).normalized();
			for (int j = 2, k = 0; k < 3; j = k++)
			{
				const unsigned int a = ti[j];
				const unsigned int b = ti[k];
				ShapeCache::Edge*& e = edges[btMin(a, b) * nv + btMax(a, b)];
				if (!e)
				{
					sc->m_edges.push_back(ShapeCache::Edge());
					e = &sc->m_edges[sc->m_edges.size() - 1];
					e->n[0] = nrm;
					e->n[1] = -nrm;
					e->v[0] = a;
					e->v[1] = b;
				}
				else
				{
					e->n[1] = nrm;
				}
			}
		}
	}
	return (sc);
}

void renderSquareA(float x, float y, float z)
{