b01233b07f
This adds support of movie textures for Cycles rendering. Uses the same builtin images routines as packed/generated images, but with some extra non-rna hookups from blender_session side. Basically, it's not so clear how to give access to video frames via C++ RNA -- it'll require exposing ImBuf to API, doing some threading locks and so. Ended up adding two more functions which are actually bad level call, but don't consider it's so much bad -- we have few bad calls already, which are actually related. Changed a bit how builtin images names are passing to image manager. Now it's not just an ID datablock name, but also a frame number concatenated via '@' character, which makes itpossible to easily know frame number to be used for movie images, without adding extra descriptors to image manager. Decoding of builtin name is a bit slower now, but it should be still nothing in comparison with rendering complexity. Also exposed image user's frame_current to python API, which is needed to get absolute frame number of movie from node's image user. P.S. Generated/packed images are also using bad level call but only does it to make things more clear here. Either all images are using C++ RNA here or no images does. That's the most clear for now.