RefcountedAsyncTexture.h

// Copyright eeGeo Ltd (2012-2014), All Rights Reserved

#pragma once

#include "IAsyncTexture.h"

namespace Eegeo
{
    namespace Rendering
    {
        namespace AsyncTexturing
        {
            template<typename TRefCounted>
            class RefcountedAsyncTexture : public IAsyncTexture
            {
            public:
                int GetReferenceCount() const
                {
                    Eegeo_ASSERT(m_referenceCount >= 0, "invalid ref count -- mismatched Increment/Decrement")
                    return m_referenceCount;
                }

                void IncrementReferenceCount()
                {
                    m_referenceCount++;
                    Eegeo_ASSERT(m_referenceCount > 0, "invalid ref count -- mismatched Increment/Decrement");
                }

                void DecrementReferenceCount()
                {
                    Eegeo_ASSERT(m_referenceCount > 0, "invalid ref count -- mismatched Increment/Decrement");
                    m_referenceCount--;

                    if (m_referenceCount == 0)
                    {
                        Self().DestroyTexture();
                        Eegeo_DELETE this;
                    }
                }
                
                bool IsReferenced() const
                {
                    Eegeo_ASSERT(m_referenceCount >= 0, "invalid ref count -- mismatched Increment/Decrement");
                    return m_referenceCount > 0;
                }
                
            protected:
                RefcountedAsyncTexture() : m_referenceCount(0) { }

            private:
                TRefCounted& Self() { return *(Eegeo::CheckedCast<TRefCounted*>(this));  }

                int m_referenceCount;
            };
        }
    }
}