Movies support for Cycles

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.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_image.c b/source/blender/makesrna/intern/rna_image.c
index 81dbfff13b2..180a5a180fd 100644
--- a/source/blender/makesrna/intern/rna_image.c
+++ b/source/blender/makesrna/intern/rna_image.c
@@ -427,6 +427,11 @@ static void rna_def_imageuser(BlenderRNA *brna)
 	RNA_def_property_update(prop, 0, "rna_ImageUser_update");
 	RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
 
+	prop = RNA_def_property(srna, "frame_current", PROP_INT, PROP_TIME);
+	RNA_def_property_int_sdna(prop, NULL, "framenr");
+	RNA_def_property_range(prop, MINAFRAME, MAXFRAME);
+	RNA_def_property_ui_text(prop, "Current Frame", "Current frame number in image sequence or movie");
+
 	/* animation */
 	prop = RNA_def_property(srna, "use_cyclic", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_sdna(prop, NULL, "cycl", 0);