Direct3D Programming Tip #9: Use The Managed Resource Pool

gistfile1.cpp

//http://legalizeadulthood.wordpress.com/2009/10/12/direct3d-programming-tip-9-use-the-managed-resource-pool/

template <typename Index>
class index_lock
{
public:
    // lock in constructor, unlock in destructor
    index_lock(IDirect3DIndexBuffer9 *ib,
        DWORD flags = 0,
        UINT offset = 0,
        UINT size = 0)
        : m_ib(ib)
    {
        void *data = 0;
        THR(m_ib->Lock(offset, size, &data, flags));
        m_data = static_cast<Index *>(data);
    }
    ~index_lock()
    {
        const HRESULT hr = m_ib->Unlock();
        assert(SUCCEEDED(hr));
    }

    // type safe accessors to vertex data
    const Index *data() const { return m_data; }
    Index *data() { return m_data; }

private:
    IDirect3DIndexBuffer9Ptr m_ib;
    Index *m_data;
};