texture data is not written directly to device context

This tracks an optimization that we have added in the past for https://github.com/3DStreamingToolkit/3DStreamingToolkit - wherein we store the device context and write to the device directly, rather than marshalling data up into a unity texture.

https://github.com/3DStreamingToolkit/3DStreamingToolkit/blob/master/Plugins/UnityServerPlugin/StreamingUnityServerPlugin.cpp#L339

Start by reviewing the issue's linked StreamingUnityServerPlugin.cpp reference around line 339 and then locate the corresponding texture-handling entry point in this repository. Compare the existing Unity texture path with the referenced direct device-context approach; done means texture data is written directly to the device context without marshalling through a Unity texture.

Written by the indexing model from the issue text.