Method CopySubresourceRegion

trinityal/dx11/Tr2TextureALDx11.cpp:1099–1165

}

ALResult Tr2TextureAL::CopySubresourceRegion( const Tr2TextureSubresource& destSubresource, Tr2TextureAL& source, const Tr2TextureSubresource& sourceSubresource, Tr2RenderContextAL& renderContext )
{
	if( !IsValid() || !renderContext.IsValid() )
	{
		return E_INVALIDCALL;
	}
	if( !source.IsValid() )
	{
		return E_INVALIDARG;
	}
	if( !HasFlag( m_cpuUsage, Tr2CpuUsage::WRITE ) && !IsWritable( m_gpuUsage ) )
	{
		return E_INVALIDCALL;
	}

	if( destSubresource.IsSubresourceFull( m_desc ) && sourceSubresource.IsSubresourceFull( source.m_desc ) )
	{
		renderContext.m_context->CopyResource( m_texture, source.m_texture );
		return S_OK;
	}

	Tr2TextureSubresource src = sourceSubresource;
	Tr2TextureSubresource dst = destSubresource;

	if( !Crop( src, source.m_desc, dst, m_desc ) )
	{
		return E_FAIL;
	}

	D3D11_BOX box = { src.m_box.left, src.m_box.top, src.m_box.front, src.m_box.right, src.m_box.bottom, src.m_box.back };

	const uint32_t srcMipCount = source.m_desc.GetTrueMipCount();
	const uint32_t dstMipCount = m_desc.GetTrueMipCount();

	const uint32_t mipCount = std::min( src.GetMipCount(), dst.GetMipCount() );

	for( uint32_t mip = 0; mip != mipCount; ++mip )
	{
		for( uint32_t face = 0; face != src.GetFaceCount(); ++face )
		{
			renderContext.m_context->CopySubresourceRegion(
				m_texture,
				D3D10CalcSubresource( dst.m_startMipLevel + mip, dst.m_startFace + face, dstMipCount ),
				dst.m_box.left,
				dst.m_box.top,
				dst.m_box.front,
				source.m_texture,
				D3D10CalcSubresource( src.m_startMipLevel + mip, src.m_startFace + face, srcMipCount ),
				&box );
		}

		if( mip + 1 != src.GetMipCount() )
		{
			AdvanceMip( src, source.m_desc, mip );
			AdvanceMip( dst, m_desc, mip );
		}

		box.left = box.left >> 1;