Method MapForReading

trinityal/dx11/Tr2TextureALDx11.cpp:802–876

}

ALResult Tr2TextureAL::MapForReading( const Tr2TextureSubresource& region, bool synchronize, const void*& data, uint32_t& pitch, Tr2RenderContextAL& renderContext )
{

	//Note: synchronize is ignored on DX11, as the current code needs significant refactoring to support asynchronous mapping.

	data = nullptr;
	if( !HasFlag( m_cpuUsage, Tr2CpuUsage::READ ) )
	{
		return E_INVALIDCALL;
	}

	if( !IsValid() || !renderContext.IsValid() )
	{
		return E_FAIL;
	}
	if( m_desc.GetType() == Tr2RenderContextEnum::TEX_TYPE_3D )
	{
		return E_FAIL;
	}

	if( !region.IsValidForBitmap( m_desc ) )
	{
		return E_INVALIDARG;
	}
	if( !region.IsSingleSubresource() )
	{
		return E_INVALIDARG;
	}

	if( !m_stagingTexture )
	{
		D3D11_TEXTURE2D_DESC desc;
		memset( &desc, 0, sizeof( desc ) );
		desc.Width = m_desc.GetWidth();
		desc.Height = m_desc.GetHeight();
		desc.MipLevels = 1;
		desc.ArraySize = 1;
		desc.Format = static_cast<DXGI_FORMAT>( Tr2RenderContextEnum::MakeTypeless( m_desc.GetFormat() ) );

		desc.Usage = D3D11_USAGE_STAGING;
		desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ | D3D11_CPU_ACCESS_WRITE;

		desc.SampleDesc.Count = 1;

		if( !renderContext.m_secondaryDevice11 )
		{
			return E_FAIL;
		}
		FORWARD_HR( renderContext.m_secondaryDevice11->CreateTexture2D( &desc, nullptr, &m_stagingTexture ) );
		if( !m_stagingTexture )
		{
			return E_FAIL;
		}
	}

	if( region.HasBox() )
	{
		D3D11_BOX box = { region.m_box.left, region.m_box.top, region.m_box.front, region.m_box.right, region.m_box.bottom, region.m_box.back };