Concurrency::graphics::details Namespace Reference

Classes
struct	_Short_vector_type_traits
struct	_Short_vector_type_traits< double >
struct	_Short_vector_type_traits< double_2 >
struct	_Short_vector_type_traits< double_3 >
struct	_Short_vector_type_traits< double_4 >
struct	_Short_vector_type_traits< float >
struct	_Short_vector_type_traits< float_2 >
struct	_Short_vector_type_traits< float_3 >
struct	_Short_vector_type_traits< float_4 >
struct	_Short_vector_type_traits< int >
struct	_Short_vector_type_traits< int_2 >
struct	_Short_vector_type_traits< int_3 >
struct	_Short_vector_type_traits< int_4 >
struct	_Short_vector_type_traits< norm >
struct	_Short_vector_type_traits< norm_2 >
struct	_Short_vector_type_traits< norm_3 >
struct	_Short_vector_type_traits< norm_4 >
struct	_Short_vector_type_traits< uint_2 >
struct	_Short_vector_type_traits< uint_3 >
struct	_Short_vector_type_traits< uint_4 >
struct	_Short_vector_type_traits< unorm >
struct	_Short_vector_type_traits< unorm_2 >
struct	_Short_vector_type_traits< unorm_3 >
struct	_Short_vector_type_traits< unorm_4 >
struct	_Short_vector_type_traits< unsigned int >
class	_Texture_base
struct	texture_traits
struct	texture_traits< const texture< _Value_type, _Rank > >
struct	texture_traits< const texture_view< _Value_type, _Rank > >
struct	texture_traits< const texture_view< const _Value_type, _Rank > >
struct	texture_traits< const writeonly_texture_view< _Value_type, _Rank > >
struct	texture_traits< texture< _Value_type, _Rank > >
struct	texture_traits< texture_view< _Value_type, _Rank > >
struct	texture_traits< texture_view< const _Value_type, _Rank > >
struct	texture_traits< writeonly_texture_view< _Value_type, _Rank > >

Functions
template<typename _Short_vector_type >
unsigned int	_Get_default_bits_per_scalar_element ()
template<int _Rank>
std::array< size_t, 3 >	_Get_dimensions (const Concurrency::extent< _Rank > &_Ext, unsigned int _Mip_offset)
template<int _Rank>
std::array< size_t, 3 >	_Get_indices (const index< _Rank > &_Idx)
template<int _Rank>
Concurrency::extent< _Rank >	_Create_extent (size_t _Width, size_t _Height, size_t _Depth)
template<typename _Value_type , int _Rank>
_Event	_Copy_async_impl (const void *_Src, unsigned int _Src_byte_size, const _Texture_base< _Value_type, _Rank > &_Dst, const index< _Rank > &_Offset, const Concurrency::extent< _Rank > &_Copy_extent)
template<typename OutputIterator , typename _Value_type , int _Rank>
_Event	_Copy_async_impl (const _Texture_base< _Value_type, _Rank > &_Src, OutputIterator _Dest_iter)
template<typename _Value_type , int _Rank>
_Event	_Copy_async_impl (const _Texture_base< _Value_type, _Rank > &_Src, const index< _Rank > &_Src_offset, const _Texture_base< _Value_type, _Rank > &_Dst, const index< _Rank > &_Dst_offset, const extent< _Rank > &_Copy_extent)
void	_Is_valid_data_length (unsigned int _Num_elems, unsigned int _Bits_per_elem)
template<typename _Value_type , int _Rank>
unsigned int	_Get_section_size (const _Texture_base< _Value_type, _Rank > &_Tex, const extent< _Rank > &_Extent)
template<typename _Input_iterator , typename _Value_type >
_Event	_Copy_async_impl (_Input_iterator _First, _Input_iterator _Last, _In_ _Texture *_Dst, const size_t *_Dst_offset, unsigned int _Dst_mipmap_level, const size_t *_Copy_extent, const size_t *_Preferred_copy_chunk_extent=NULL)
template<typename _Output_iterator , typename _Value_type >
_Event	_Copy_async_impl (_Texture *_Tex, const size_t *_Tex_offset, unsigned int _Src_mipmap_level, const size_t *_Copy_extent, _Output_iterator _First, const size_t *_Preferred_copy_chunk_extent=NULL)
template<typename _Value_type , int _Rank>
_Event	_Copy_async_impl (const _Texture_base< _Value_type, _Rank > &_Src, const index< _Rank > &_Src_offset, const extent< _Rank > &_Copy_extent, _Out_ void *_Dst, unsigned int _Dst_byte_size)
template<typename _Output_iterator , typename _Value_type , int _Rank>
_Event	_Copy_async_impl (const _Texture_base< _Value_type, _Rank > &_Src, const index< _Rank > &_Src_offset, const extent< _Rank > &_Copy_extent, _Output_iterator _Dest_iter)
template<typename _Input_iterator , typename _Value_type , int _Rank>
_Event	_Copy_async_impl (_Input_iterator _First, _Input_iterator _Last, const _Texture_base< _Value_type, _Rank > &_Dst, const index< _Rank > &_Dst_offset, const extent< _Rank > &_Copy_extent)
template<int _Rank>
Concurrency::extent< _Rank >	_Make_texture (const Concurrency::accelerator_view &_Av, _In_ IUnknown *_D3D_texture, _Texture_base_type_id _Id, _Inout_ _Texture **_Tex, DXGI_FORMAT _View_format) __CPU_ONLY

Function Documentation

template<typename _Value_type , int _Rank>

_Event Concurrency::graphics::details::_Copy_async_impl	(	const void *	_Src,
		unsigned int	_Src_byte_size,
		const _Texture_base< _Value_type, _Rank > &	_Dst,
		const index< _Rank > &	_Offset,
		const Concurrency::extent< _Rank > &	_Copy_extent
	)

{
    _Is_valid_section(_Dst.extent, _Dst_offset, _Copy_extent);
    
    if (_Dst.get_mipmap_levels() > 1)
    {
        throw runtime_exception("Invalid destination - multiple mipmap levels cannot be copied from source", E_INVALIDARG);
    }
        
    if (_Src_byte_size < _Get_section_size(_Dst, _Copy_extent))
    {
        if (_Dst.extent == _Copy_extent)
        {
            throw runtime_exception("Invalid _Src_byte_size argument. _Src_byte_size is smaller than the total size of _Dst.", E_INVALIDARG);
        }
        else
        {
            throw runtime_exception("Invalid _Src_byte_size argument. _Src_byte_size is smaller than the provided section of _Dst.", E_INVALIDARG);
        }
    }

    _Texture *_Dst_tex_ptr = _Get_texture(_Dst);
    std::array<size_t, 3> _Copy_extent_arr = _Get_dimensions(_Copy_extent, /*_Mip_offset=*/0);
    std::array<size_t, 3> _Dst_offset_arr = _Get_indices(_Dst_offset);
    auto _First = stdext::make_unchecked_array_iterator(reinterpret_cast<const unsigned char*>(_Src));
    auto _Last = stdext::make_unchecked_array_iterator(reinterpret_cast<const unsigned char*>(_Src) + _Src_byte_size);
    
    return _Copy_async_impl<decltype(_First), unsigned char>(_First, _Last, _Dst_tex_ptr, _Dst_offset_arr.data(), _Get_texture_descriptor(_Dst)._Get_most_detailed_mipmap_level(), _Copy_extent_arr.data());
}

template<typename OutputIterator , typename _Value_type , int _Rank>

_Event Concurrency::graphics::details::_Copy_async_impl	(	const _Texture_base< _Value_type, _Rank > &	_Src,
		OutputIterator	_Dest_iter
	)

template<typename _Value_type , int _Rank>

_Event Concurrency::graphics::details::_Copy_async_impl	(	const _Texture_base< _Value_type, _Rank > &	_Src,
		const index< _Rank > &	_Src_offset,
		const _Texture_base< _Value_type, _Rank > &	_Dst,
		const index< _Rank > &	_Dst_offset,
		const extent< _Rank > &	_Copy_extent
	)

{
    _Is_valid_section(_Src.extent, _Src_offset, _Copy_extent);
    _Is_valid_section(_Dst.extent, _Dst_offset, _Copy_extent);

    _Texture_descriptor _Src_tex_desc = _Get_texture_descriptor(_Src);
    _Texture_descriptor _Dst_tex_desc = _Get_texture_descriptor(_Dst);

    if (_Src_tex_desc._Get_view_mipmap_levels() != _Dst_tex_desc._Get_view_mipmap_levels())
    {
        throw runtime_exception("The source and destination textures must have the exactly the same number of mipmap levels for texture copy.", E_INVALIDARG);
    }

    bool _Is_whole_texture_copy = (_Src_offset == _Dst_offset && _Src_offset == index<_Rank>() && _Src.extent == _Dst.extent && _Src.extent == _Copy_extent);

    if (_Src_tex_desc._Get_view_mipmap_levels() > 1 && !_Is_whole_texture_copy)
    {
        throw runtime_exception("Sections are not allowed when copy involves multiple mipmap levels", E_INVALIDARG);
    }

    if (_Src_tex_desc._Are_mipmap_levels_overlapping(&_Dst_tex_desc))
    {
        throw runtime_exception("The source and destination are overlapping areas on the same texture", E_INVALIDARG);
    }

    _Texture* _Src_tex = _Get_texture(_Src);
    _Texture* _Dst_tex = _Get_texture(_Dst);

    // Formats must be identical for non-adopted textures.  Textures created through D3D interop are not subject to this test
    // to allow copy between related, but not identical, formats.  Attempting to copy between unrelated formats through interop
    // will result in exceptions in debug mode and undefined behavior in release mode.
    if (!_Src_tex->_Is_adopted() && !_Dst_tex->_Is_adopted() && (_Src_tex->_Get_texture_format() != _Dst_tex->_Get_texture_format()))
    {
        throw runtime_exception("The source and destination textures are not compatible.", E_INVALIDARG);
    }

    std::array<size_t, 3> _Src_offset_arr = _Get_indices(_Src_offset);
    std::array<size_t, 3> _Dst_offset_arr = _Get_indices(_Dst_offset);

    _Event _Copy_event;

    unsigned int _Src_most_detailed_mipmap_level = _Src_tex_desc._Get_most_detailed_mipmap_level();
    unsigned int _Dst_most_detailed_mipmap_level = _Dst_tex_desc._Get_most_detailed_mipmap_level();

    // Copy all mipmap levels from source to destination one by one.
    // Note that the offsets are not allowed therefore only dimensions need to be updated for subsequent mipmap levels
    for (unsigned int _Mip_offset = 0; _Mip_offset < _Src_tex_desc._Get_view_mipmap_levels(); ++_Mip_offset)
    {
        std::array<size_t, 3> _Copy_extent_arr = _Get_dimensions(_Copy_extent, _Mip_offset);

        auto _Step_event = _Copy_async_impl(_Src_tex, _Src_offset_arr.data(), _Src_most_detailed_mipmap_level + _Mip_offset,
                                            _Dst_tex, _Dst_offset_arr.data(), _Dst_most_detailed_mipmap_level + _Mip_offset,
                                            _Copy_extent_arr.data());

        _Copy_event = _Copy_event._Add_event(_Step_event);
    }

    return _Copy_event;
}

template<typename _Input_iterator , typename _Value_type >

_Event Concurrency::graphics::details::_Copy_async_impl	(	_Input_iterator	_First,
		_Input_iterator	_Last,
		_In_ _Texture *	_Dst,
		const size_t *	_Dst_offset,
		unsigned int	_Dst_mipmap_level,
		const size_t *	_Copy_extent,
		const size_t *	_Preferred_copy_chunk_extent = NULL
	)

{
    _ASSERTE(_Dst != nullptr);
    _ASSERTE(_Dst_offset != nullptr);
    _ASSERTE(_Copy_extent != nullptr);

    _ASSERTE((unsigned int)std::distance(_First, _Last) >= (_Copy_extent[0] * _Copy_extent[1] * _Copy_extent[2]));

    // The copy region should be within the bounds of the destination texture
    _ASSERTE((_Dst_offset[0] + _Copy_extent[0]) <= _Dst->_Get_width(_Dst_mipmap_level));
    _ASSERTE((_Dst_offset[1] + _Copy_extent[1]) <= _Dst->_Get_height(_Dst_mipmap_level));
    _ASSERTE((_Dst_offset[2] + _Copy_extent[2]) <= _Dst->_Get_depth(_Dst_mipmap_level));

#pragma warning( push )
#pragma warning( disable : 4127 ) // conditional expression is constant
    if ((sizeof(_Value_type) > sizeof(unsigned char)) && (_Dst->_Get_bits_per_element() != (8U * sizeof(_Value_type))))
    {
        throw runtime_exception("Iterator-based copy is not supported on textures where the size of the _Value_type is not equal to the texel size.", E_INVALIDARG);
    }
#pragma warning( pop )

    // If the dest is accessible on the host we can perform the copy entirely on the host
    if (_Dst->_Get_host_ptr() != NULL)
    {
        // We have made sure that the three multiplications below won't cause integer overflow when creating the texture
        _ASSERTE(((_Dst->_Get_bits_per_element() * _Copy_extent[0]) % (8U * sizeof(_Value_type))) == 0);

        size_t _Row_size = (_Dst->_Get_bits_per_element() * _Copy_extent[0]) >> 3; // in bytes
        size_t _Depth_slice_size = _Row_size * _Copy_extent[1];

        size_t _Row_pitch = _Dst->_Get_row_pitch();
        size_t _Depth_pitch = _Dst->_Get_depth_pitch();
        _ASSERTE(_Row_pitch >= _Row_size);
        _ASSERTE(_Depth_pitch >= _Depth_slice_size);

        size_t _Dst_offset_in_bytes = ((_Dst_offset[0] * _Dst->_Get_bits_per_element()) >> 3) +
                                        (_Dst_offset[1] * _Row_pitch) + (_Dst_offset[2] * _Depth_pitch);

        unsigned char *_PDest = reinterpret_cast<unsigned char*>(_Dst->_Get_host_ptr()) + _Dst_offset_in_bytes;

        _Copy_data_on_host(_Dst->_Get_rank(), _First, reinterpret_cast<_Value_type*>(_PDest),
                           _Row_size / sizeof(_Value_type), _Copy_extent[1], _Copy_extent[2],
                           _Row_pitch, _Depth_pitch, _Row_size / sizeof(_Value_type), _Depth_slice_size / sizeof(_Value_type));

        return _Event();
    }
    
    // The dest is not accessbile on the host; we need to copy src to
    // a temporary staging texture and launch a copy from the staging texture
    // to the dest texture.
    _Event _Ev;
    
    // Determine the copy chunk extent
    std::array<size_t, 3> _Copy_chunk_extent;
    if (_Preferred_copy_chunk_extent != NULL)
    {
        std::copy(&_Preferred_copy_chunk_extent[0], &_Preferred_copy_chunk_extent[3], _Copy_chunk_extent.begin());
    }
    else 
    {
        _Get_preferred_copy_chunk_extent(_Dst->_Get_rank(), _Copy_extent[0], _Copy_extent[1], _Copy_extent[2], _Dst->_Get_bits_per_element(), _Copy_chunk_extent.data());
    }

    std::array<size_t, 3> _Curr_copy_offset;
    std::copy(&_Dst_offset[0], &_Dst_offset[3], _Curr_copy_offset.begin());

    std::array<size_t, 3> _Remaining_copy_extent;
    std::copy(&_Copy_extent[0], &_Copy_extent[3], _Remaining_copy_extent.begin());

    bool _Truncated_copy = false;
    do
    {
        _Texture_ptr _Dst_staging_tex_ptr;
        std::array<size_t, 3> _Curr_copy_extent;
        _Truncated_copy = _Get_chunked_staging_texture(_Dst, _Copy_chunk_extent.data(), _Remaining_copy_extent.data(), _Curr_copy_extent.data(), &_Dst_staging_tex_ptr);


        // Now copy from the src pointer to the temp staging texture
        _Dst_staging_tex_ptr->_Map_buffer(_Write_access, true /* _Wait */);

        std::array<size_t, 3> _Dst_staging_tex_offset;
        _Dst_staging_tex_offset.fill(0);
        _Event _Temp_ev = _Copy_async_impl<_Input_iterator, _Value_type>(_First, _Last, _Dst_staging_tex_ptr,
                                                                         _Dst_staging_tex_offset.data(), /*_Dst_mipmap_level=*/0, _Curr_copy_extent.data(), _Copy_chunk_extent.data());

        // Now chain a copy from the temporary staging texture to the _Dst texture
        _Texture_ptr _Dst_tex_ptr = _Dst;
        _Temp_ev = _Temp_ev._Add_continuation(std::function<_Event()>([_Dst_staging_tex_ptr, _Dst_tex_ptr, _Curr_copy_extent,
                                                                       _Dst_staging_tex_offset, _Curr_copy_offset, _Dst_mipmap_level]() mutable -> _Event
        {
            return _Dst_staging_tex_ptr->_Copy_to_async(_Dst_tex_ptr, _Curr_copy_extent.data(), _Dst_staging_tex_offset.data(), _Curr_copy_offset.data(), /*_Src_mipmap_level=*/0, _Dst_mipmap_level);
        }));

        _Ev = _Ev._Add_event(_Temp_ev);

        // Now adjust the _Src and _Dst offsets for the remaining part of the copy
        if (_Truncated_copy)
        {
            // The offset only needs to be adjusted in the most significant dimension
            _Curr_copy_offset[_Dst->_Get_rank() - 1] += _Curr_copy_extent[_Dst->_Get_rank() - 1];
            std::advance(_First, (((_Curr_copy_extent[0] * _Dst->_Get_bits_per_element()) >> 3) / sizeof(_Value_type)) * _Curr_copy_extent[1] * _Curr_copy_extent[2]);
        }

    } while (_Truncated_copy);
    
    return _Ev;
}

template<typename _Output_iterator , typename _Value_type >

_Event Concurrency::graphics::details::_Copy_async_impl	(	_Texture *	_Tex,
		const size_t *	_Tex_offset,
		unsigned int	_Src_mipmap_level,
		const size_t *	_Copy_extent,
		_Output_iterator	_First,
		const size_t *	_Preferred_copy_chunk_extent = NULL
	)

{
    _ASSERTE(_Tex != nullptr);
    _ASSERTE(_Tex_offset != nullptr);
    _ASSERTE(_Copy_extent != nullptr);

    // The copy region should be within the bounds of the source texture
    _ASSERTE((_Tex_offset[0] + _Copy_extent[0]) <= _Tex->_Get_width(_Src_mipmap_level));
    _ASSERTE((_Tex_offset[1] + _Copy_extent[1]) <= _Tex->_Get_height(_Src_mipmap_level));
    _ASSERTE((_Tex_offset[2] + _Copy_extent[2]) <= _Tex->_Get_depth(_Src_mipmap_level));

#pragma warning( push )
#pragma warning( disable : 4127 ) // conditional expression is constant
    if ((sizeof(_Value_type) > sizeof(unsigned char)) && (_Tex->_Get_bits_per_element() != (8U * sizeof(_Value_type))))
    {
        throw runtime_exception("Iterator-based copy is not supported on textures where the size of the _Value_type is not equal to the texel size.", E_INVALIDARG);
    }
#pragma warning( pop )

    // If the texture is available on the host then we can perform the copy entirely on the host
    if (_Tex->_Get_host_ptr() != nullptr)
    {
        // We have made sure that the three multiplications below won't cause integer overflow when creating the texture
        _ASSERTE(((_Tex->_Get_bits_per_element() * _Copy_extent[0]) % 8U) == 0);

        size_t _Row_size = (_Tex->_Get_bits_per_element() * _Copy_extent[0]) >> 3; // in bytes
        size_t _Depth_slice_size = _Row_size * _Copy_extent[1];

        size_t _Row_pitch = _Tex->_Get_row_pitch();
        size_t _Depth_pitch = _Tex->_Get_depth_pitch();
        _ASSERTE(_Row_pitch >= _Row_size);
        _ASSERTE(_Depth_pitch >= _Depth_slice_size);

        size_t _Tex_offset_in_bytes = ((_Tex_offset[0] * _Tex->_Get_bits_per_element()) >> 3) +
                                       (_Tex_offset[1] * _Row_pitch) + (_Tex_offset[2] * _Depth_pitch);

        unsigned char *_PTex = reinterpret_cast<unsigned char*>(_Tex->_Get_host_ptr()) + _Tex_offset_in_bytes;

        _Copy_data_on_host(_Tex->_Get_rank(), reinterpret_cast<_Value_type*>(_PTex), _First,
            _Row_size / sizeof(_Value_type), _Copy_extent[1], _Copy_extent[2],
            _Row_pitch, _Depth_pitch, _Row_size / sizeof(_Value_type), _Depth_slice_size / sizeof(_Value_type));

        return _Event();
    }
    
    // The texture is not accessbile on the host; we need to copy to/from a staging
    // texture before the copy to the destination.  This is done in chunks, such that
    // we can concurrently copy from the source texture to a staging texture while
    // copying from a staging texture from a previous chunk to the destination.  
    _Event _Ev;

    // Determine the copy chunk extent
    std::array<size_t, 3> _Copy_chunk_extent;
    if (_Preferred_copy_chunk_extent != nullptr)
    {
        std::copy(&_Preferred_copy_chunk_extent[0], &_Preferred_copy_chunk_extent[3], _Copy_chunk_extent.begin());
    }
    else 
    {
        _Get_preferred_copy_chunk_extent(_Tex->_Get_rank(), _Copy_extent[0], _Copy_extent[1], _Copy_extent[2], _Tex->_Get_bits_per_element(), _Copy_chunk_extent.data());
    }
    
    std::array<size_t, 3> _Curr_copy_offset;
    std::copy(&_Tex_offset[0], &_Tex_offset[3], _Curr_copy_offset.begin());

    std::array<size_t, 3> _Remaining_copy_extent;
    std::copy(&_Copy_extent[0], &_Copy_extent[3], _Remaining_copy_extent.begin());
    
    bool _Truncated_copy = false;

    _Texture_ptr _Staging_tex_ptr;
    std::array<size_t, 3> _Curr_copy_extent;
    _Truncated_copy = _Get_chunked_staging_texture(_Tex, _Copy_chunk_extent.data(), _Remaining_copy_extent.data(), _Curr_copy_extent.data(), &_Staging_tex_ptr);

    // Now copy into the temp staging texture
    std::array<size_t, 3> _Staging_tex_offset;
    _Staging_tex_offset.fill(0);
    _Event _Temp_ev = _Copy_async_impl(_Tex, _Curr_copy_offset.data(), _Src_mipmap_level,
                                       _Staging_tex_ptr._Get_ptr(), _Staging_tex_offset.data(), /*_Dst_mipmap_level=*/0,
                                       _Curr_copy_extent.data(), _Copy_chunk_extent.data());
    _Ev = _Ev._Add_event(_Temp_ev);

    // If we have finished our copy, we just need to add a continuation to copy
    // from the temporary staging texture to the _Dst pointer
    if (!_Truncated_copy) 
    {
        return _Ev._Add_continuation(std::function<_Event()>([_Staging_tex_ptr, 
            _Curr_copy_extent, _Staging_tex_offset, _Copy_chunk_extent, _First]() mutable -> _Event 
        {
            return _Copy_async_impl<_Output_iterator, _Value_type>(_Staging_tex_ptr, _Staging_tex_offset.data(), /*_Src_mipmap_level=*/0, _Curr_copy_extent.data(), _First, _Copy_chunk_extent.data());
        }));
    }
    else
    {
        // The copy was truncated. We need to recursively perform the rest of the copy
        _Texture_ptr _Tex_ptr = _Tex;
        _Curr_copy_offset[_Tex->_Get_rank() - 1] += _Curr_copy_extent[_Tex->_Get_rank() - 1];
        return _Ev._Add_continuation(std::function<_Event()>([_Staging_tex_ptr, _First, _Curr_copy_extent,
            _Staging_tex_offset, _Tex_ptr, _Curr_copy_offset, _Remaining_copy_extent, _Copy_chunk_extent, _Src_mipmap_level]() mutable -> _Event 
        {
            // Initiate copying of the remaining portion
            _Output_iterator _New_dst_iter = _First;
            _Advance_output_iterator<decltype(_New_dst_iter), size_t>(_New_dst_iter, (((_Curr_copy_extent[0] * _Tex_ptr->_Get_bits_per_element()) >> 3) / sizeof(_Value_type)) * _Curr_copy_extent[1] * _Curr_copy_extent[2]);
            _Event _Ev1 = _Copy_async_impl<_Output_iterator, _Value_type>(_Tex_ptr, _Curr_copy_offset.data(), _Src_mipmap_level, _Remaining_copy_extent.data(), _New_dst_iter, _Copy_chunk_extent.data());

            // Now copy the data from the temp staging buffer to the _Dst pointer
            _Event _Ev2 = _Copy_async_impl<_Output_iterator, _Value_type>(_Staging_tex_ptr, _Staging_tex_offset.data(), /*_Src_mipmap_level=*/0, _Curr_copy_extent.data(), _First, _Copy_chunk_extent.data());

            return _Ev2._Add_event(_Ev1);
        }));
    }
}

template<typename _Value_type , int _Rank>

_Event Concurrency::graphics::details::_Copy_async_impl	(	const _Texture_base< _Value_type, _Rank > &	_Src,
		const index< _Rank > &	_Src_offset,
		const extent< _Rank > &	_Copy_extent,
		_Out_ void *	_Dst,
		unsigned int	_Dst_byte_size
	)

{
    _Is_valid_section(_Src.extent, _Src_offset, _Copy_extent);
    
    if (_Src.get_mipmap_levels() > 1)
    {
        throw runtime_exception("Invalid source - multiple mipmap levels cannot be copied to destination", E_INVALIDARG);
    }
        
    if (_Get_section_size(_Src, _Copy_extent) > _Dst_byte_size) 
    {
        if (_Src.extent == _Copy_extent)
        {
            throw runtime_exception("Invalid _Dst_byte_size argument. _Dst_byte_size is smaller than the size of _Src.", E_INVALIDARG);
        }
        else
        {
            throw runtime_exception("Invalid _Dst_byte_size argument. _Dst_byte_size is smaller than the provided section of _Src.", E_INVALIDARG);
        }
    }

    _Texture *_Src_tex_ptr = _Get_texture(_Src);
    std::array<size_t, 3> _Copy_extent_arr = _Get_dimensions(_Copy_extent, /*_Mip_offset=*/0);
    std::array<size_t, 3> _Src_offset_arr = _Get_indices(_Src_offset);

    auto _First = stdext::make_unchecked_array_iterator(reinterpret_cast<unsigned char*>(_Dst));

    return _Copy_async_impl<decltype(_First), unsigned char>(_Src_tex_ptr, _Src_offset_arr.data(), _Get_texture_descriptor(_Src)._Get_most_detailed_mipmap_level(), _Copy_extent_arr.data(), _First);
}

template<typename _Output_iterator , typename _Value_type , int _Rank>

_Event Concurrency::graphics::details::_Copy_async_impl	(	const _Texture_base< _Value_type, _Rank > &	_Src,
		const index< _Rank > &	_Src_offset,
		const extent< _Rank > &	_Copy_extent,
		_Output_iterator	_Dest_iter
	)

{
    _Is_valid_section(_Src.extent, _Src_offset, _Copy_extent);
    
    if (_Src.get_mipmap_levels() > 1)
    {
        throw runtime_exception("Invalid source - multiple mipmap levels cannot be copied to destination", E_INVALIDARG);
    }    
    
    _Texture *_Src_tex_ptr = _Get_texture(_Src);
    std::array<size_t, 3> _Copy_extent_arr = _Get_dimensions(_Copy_extent, /*_Mip_offset=*/0);
    std::array<size_t, 3> _Src_offset_arr = _Get_indices(_Src_offset);

    return _Copy_async_impl<_Output_iterator, _Value_type>(_Src_tex_ptr, _Src_offset_arr.data(), _Get_texture_descriptor(_Src)._Get_most_detailed_mipmap_level(), _Copy_extent_arr.data(), _Dest_iter);
}

template<typename _Input_iterator , typename _Value_type , int _Rank>

_Event Concurrency::graphics::details::_Copy_async_impl	(	_Input_iterator	_First,
		_Input_iterator	_Last,
		const _Texture_base< _Value_type, _Rank > &	_Dst,
		const index< _Rank > &	_Dst_offset,
		const extent< _Rank > &	_Copy_extent
	)

{   
    _Is_valid_section(_Dst.extent, _Dst_offset, _Copy_extent);
    if (static_cast<unsigned int>(std::distance(_First, _Last)) < _Copy_extent.size())
    {
        throw runtime_exception("Inadequate amount of data supplied through the iterators", E_INVALIDARG);
    }
    
    if (_Dst.get_mipmap_levels() > 1)
    {
        throw runtime_exception("Invalid destination - multiple mipmap levels cannot be copied from source", E_INVALIDARG);
    }  

    std::array<size_t, 3> _Copy_extent_arr = _Get_dimensions(_Copy_extent, /*_Mip_offset=*/0);
    std::array<size_t, 3> _Dst_offset_arr = _Get_indices(_Dst_offset);

    _Texture *_Dst_tex_ptr = _Get_texture(_Dst);
    return _Copy_async_impl<_Input_iterator, _Value_type>(_First, _Last, _Dst_tex_ptr, _Dst_offset_arr.data(), _Get_texture_descriptor(_Dst)._Get_most_detailed_mipmap_level(), _Copy_extent_arr.data());
}

template<int _Rank>

Concurrency::extent<_Rank> Concurrency::graphics::details::_Create_extent	(	size_t	_Width,
		size_t	_Height,
		size_t	_Depth
	)

{
    extent<_Rank> _Ext;
    switch((_Rank)) {
    case 1:
        _Ext[0] = static_cast<int>(_Width);
        break;
    case 2:
        _Ext[0] = static_cast<int>(_Height);
        _Ext[1] = static_cast<int>(_Width);
        break;
    case 3:
        _Ext[0] = static_cast<int>(_Depth);
        _Ext[1] = static_cast<int>(_Height);
        _Ext[2] = static_cast<int>(_Width);
        break;
    default:
        _ASSERTE(false);
        break;
    }
    return _Ext;
}

template<typename _Short_vector_type >

unsigned int Concurrency::graphics::details::_Get_default_bits_per_scalar_element

(

)

{
    return _Short_vector_type_traits<_Short_vector_type>::_Format_base_type_id == _Double_type ? 
            _Short_vector_type_traits<_Short_vector_type>::_Default_bits_per_channel * 2 :
            _Short_vector_type_traits<_Short_vector_type>::_Default_bits_per_channel;
}

template<int _Rank>

std::array<size_t, 3> Concurrency::graphics::details::_Get_dimensions	(	const Concurrency::extent< _Rank > &	_Ext,
		unsigned int	_Mip_offset
	)

{
    std::array<size_t, 3> _Arr;
    // For un-used dimensions, use value 1.
    switch((_Rank)) {
    case 1:
        _Arr[0] = static_cast<size_t>((_Ext[0] >> _Mip_offset) ? (_Ext[0] >> _Mip_offset) : 1U);
        _Arr[1] = 1;
        _Arr[2] = 1;
        break;
    case 2:
        _Arr[0] = static_cast<size_t>((_Ext[1] >> _Mip_offset) ? (_Ext[1] >> _Mip_offset) : 1U);
        _Arr[1] = static_cast<size_t>((_Ext[0] >> _Mip_offset) ? (_Ext[0] >> _Mip_offset) : 1U);
        _Arr[2] = 1;
        break;
    case 3:
        _Arr[0] = static_cast<size_t>((_Ext[2] >> _Mip_offset) ? (_Ext[2] >> _Mip_offset) : 1U);
        _Arr[1] = static_cast<size_t>((_Ext[1] >> _Mip_offset) ? (_Ext[1] >> _Mip_offset) : 1U);
        _Arr[2] = static_cast<size_t>((_Ext[0] >> _Mip_offset) ? (_Ext[0] >> _Mip_offset) : 1U);
        break;
    default:
        _ASSERTE(false);
        _Arr[0] = 1;
        _Arr[1] = 1;
        _Arr[2] = 1;
        break;
    }
    return _Arr;
}

template<int _Rank>

std::array<size_t, 3> Concurrency::graphics::details::_Get_indices

(

const index< _Rank > &

_Idx

)

{
    std::array<size_t, 3> _Arr;
        // For un-used dimensions, use value 0.
    switch((_Rank)) {
    case 1:
        _Arr[0] = static_cast<size_t>(_Idx[0]);
        _Arr[1] = 0;
        _Arr[2] = 0;
        break;
    case 2:
        _Arr[0] = static_cast<size_t>(_Idx[1]);
        _Arr[1] = static_cast<size_t>(_Idx[0]);
        _Arr[2] = 0;
        break;
    case 3:
        _Arr[0] = static_cast<size_t>(_Idx[2]);
        _Arr[1] = static_cast<size_t>(_Idx[1]);
        _Arr[2] = static_cast<size_t>(_Idx[0]);
        break;
    default:
        _ASSERTE(false);
        _Arr[0] = 0;
        _Arr[1] = 0;
        _Arr[2] = 0;
        break;
    }
    return _Arr;
}

template<typename _Value_type , int _Rank>

unsigned int Concurrency::graphics::details::_Get_section_size	(	const _Texture_base< _Value_type, _Rank > &	_Tex,
		const extent< _Rank > &	_Extent
	)

{
    _Texture* _Tex_ptr = _Get_texture(_Tex);
    _Texture_descriptor _Tex_desc = _Get_texture_descriptor(_Tex);

    return _Tex_ptr->_Get_data_length(_Tex_desc._Get_most_detailed_mipmap_level(), _Tex_desc._Get_view_mipmap_levels(), _Get_dimensions(_Extent, /*Mip_offset=*/0).data());
}

void Concurrency::graphics::details::_Is_valid_data_length ( unsigned int  _Num_elems, unsigned int  _Bits_per_elem  )

inline

{
    unsigned long long _Bytes_per_elem = static_cast<unsigned long long>(_Bits_per_elem / 8U);
    unsigned long long _Total_bytes = static_cast<unsigned long long>(_Num_elems) * _Bytes_per_elem; 
    if (_Total_bytes > static_cast<unsigned long long>(UINT_MAX))
    {
        throw runtime_exception("Invalid - texture data_length exceeds UINT_MAX", E_INVALIDARG);
    }
}

template<int _Rank>

Concurrency::extent<_Rank> Concurrency::graphics::details::_Make_texture	(	const Concurrency::accelerator_view &	_Av,
		_In_ IUnknown *	_D3D_texture,
		_Texture_base_type_id	_Id,
		_Inout_ _Texture **	_Tex,
		DXGI_FORMAT	_View_format
	)

{
    if (_D3D_texture == NULL)
    {
        throw runtime_exception("NULL D3D texture pointer.", E_INVALIDARG);
    }

    if (!Concurrency::details::_Is_D3D_accelerator_view(_Av)) {
        throw runtime_exception("Cannot create D3D texture on a non-D3D accelerator_view.", E_INVALIDARG);
    }

    _Texture * _Tex_ptr = _Texture::_Adopt_texture(_Rank, _Id, _D3D_texture, _Av, _View_format);
    if (_Tex_ptr->_Is_staging())
    {
        _Tex_ptr->_Map_buffer(_Write_access, true /* _Wait */);
    }
    Concurrency::extent<_Rank> _Ext = Concurrency::graphics::details::_Create_extent<_Rank>(_Tex_ptr->_Get_width(), _Tex_ptr->_Get_height(), _Tex_ptr->_Get_depth());

    _Is_valid_extent(_Ext);
    details::_Is_valid_data_length(_Ext.size(), _Tex_ptr->_Get_bits_per_element());

    *_Tex = _Tex_ptr;
    return _Ext;
}