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, 4 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_image.h b/source/blender/blenkernel/BKE_image.h
index 499609932d1..597f2f25575 100644
--- a/source/blender/blenkernel/BKE_image.h
+++ b/source/blender/blenkernel/BKE_image.h
@@ -219,6 +219,10 @@ void BKE_image_buf_fill_color(unsigned char *rect, float *rect_float, int width,
 void BKE_image_buf_fill_checker(unsigned char *rect, float *rect_float, int height, int width);
 void BKE_image_buf_fill_checker_color(unsigned char *rect, float *rect_float, int height, int width);
 
+/* Cycles hookup */
+unsigned char *BKE_image_get_pixels_for_frame(struct Image *image, int frame);
+float *BKE_image_get_float_pixels_for_frame(struct Image *image, int frame);
+
 #ifdef __cplusplus
 }
 #endif