Basic Alembic support

All in all, this patch adds an Alembic importer, an Alembic exporter,
and a new CacheFile data block which, for now, wraps around an Alembic
archive. This data block is made available through a new modifier ("Mesh
Sequence Cache") as well as a new constraint ("Transform Cache") to
somewhat properly support respectively geometric and transformation data
streaming from alembic caches.

A more in-depth documentation is to be found on the wiki, as well as a
 guide to compile alembic: https://wiki.blender.org/index.php/
User:Kevindietrich/AlembicBasicIo.

Many thanks to everyone involved in this little project, and huge shout
out to "cgstrive" for the thorough testings with Maya, 3ds Max, Houdini
and Realflow as well as @fjuhec, @jensverwiebe and @jasperge for the
custom builds and compile fixes.

Reviewers: sergey, campbellbarton, mont29

Reviewed By: sergey, campbellbarton, mont29

Differential Revision: https://developer.blender.org/D2060

1 files changed, 84 insertions, 0 deletions

diff --git a/source/blender/editors/animation/anim_channels_defines.c b/source/blender/editors/animation/anim_channels_defines.c
index 752544f65e1..3085e383909 100644
--- a/source/blender/editors/animation/anim_channels_defines.c
+++ b/source/blender/editors/animation/anim_channels_defines.c
@@ -40,6 +40,7 @@
 
 #include "DNA_anim_types.h"
 #include "DNA_armature_types.h"
+#include "DNA_cachefile_types.h"
 #include "DNA_camera_types.h"
 #include "DNA_object_types.h"
 #include "DNA_particle_types.h"
@@ -1578,6 +1579,88 @@ static bAnimChannelType ACF_DSTEX =
 /* Camera Expander  ------------------------------------------- */
 
 // TODO: just get this from RNA?
+static int acf_dscachefile_icon(bAnimListElem *ale)
+{
+	UNUSED_VARS(ale);
+	return ICON_FILE;
+}
+
+/* get the appropriate flag(s) for the setting when it is valid  */
+static int acf_dscachefile_setting_flag(bAnimContext *ac, eAnimChannel_Settings setting, bool *neg)
+{
+	/* clear extra return data first */
+	*neg = false;
+
+	switch (setting) {
+		case ACHANNEL_SETTING_EXPAND: /* expanded */
+			return CACHEFILE_DS_EXPAND;
+
+		case ACHANNEL_SETTING_MUTE: /* mute (only in NLA) */
+			return ADT_NLA_EVAL_OFF;
+
+		case ACHANNEL_SETTING_VISIBLE: /* visible (only in Graph Editor) */
+			*neg = true;
+			return ADT_CURVES_NOT_VISIBLE;
+
+		case ACHANNEL_SETTING_SELECT: /* selected */
+			return ADT_UI_SELECTED;
+
+		default: /* unsupported */
+			return 0;
+	}
+
+	UNUSED_VARS(ac);
+}
+
+/* get pointer to the setting */
+static void *acf_dscachefile_setting_ptr(bAnimListElem *ale, eAnimChannel_Settings setting, short *type)
+{
+	CacheFile *cache_file = (CacheFile *)ale->data;
+
+	/* clear extra return data first */
+	*type = 0;
+
+	switch (setting) {
+		case ACHANNEL_SETTING_EXPAND: /* expanded */
+			return GET_ACF_FLAG_PTR(cache_file->flag, type);
+
+		case ACHANNEL_SETTING_SELECT: /* selected */
+		case ACHANNEL_SETTING_MUTE: /* muted (for NLA only) */
+		case ACHANNEL_SETTING_VISIBLE: /* visible (for Graph Editor only) */
+			if (cache_file->adt) {
+				return GET_ACF_FLAG_PTR(cache_file->adt->flag, type);
+			}
+
+			return NULL;
+
+		default: /* unsupported */
+			return NULL;
+	}
+}
+
+/* CacheFile expander type define. */
+static bAnimChannelType ACF_DSCACHEFILE =
+{
+	"Cache File Expander",          /* type name */
+	ACHANNEL_ROLE_EXPANDER,         /* role */
+
+	acf_generic_dataexpand_color,   /* backdrop color */
+	acf_generic_dataexpand_backdrop, /* backdrop */
+	acf_generic_indention_1,        /* indent level */
+	acf_generic_basic_offset,       /* offset */
+
+	acf_generic_idblock_name,       /* name */
+	acf_generic_idfill_name_prop,   /* name prop */
+	acf_dscachefile_icon,           /* icon */
+
+	acf_generic_dataexpand_setting_valid,   /* has setting */
+	acf_dscachefile_setting_flag,           /* flag for setting */
+	acf_dscachefile_setting_ptr             /* pointer for setting */
+};
+
+/* Camera Expander  ------------------------------------------- */
+
+// TODO: just get this from RNA?
 static int acf_dscam_icon(bAnimListElem *UNUSED(ale))
 {
 	return ICON_CAMERA_DATA;
@@ -3388,6 +3471,7 @@ static void ANIM_init_channel_typeinfo_data(void)
 		animchannelTypeInfo[type++] = &ACF_DSMAT;        /* Material Channel */
 		animchannelTypeInfo[type++] = &ACF_DSLAM;        /* Lamp Channel */
 		animchannelTypeInfo[type++] = &ACF_DSCAM;        /* Camera Channel */
+		animchannelTypeInfo[type++] = &ACF_DSCACHEFILE;  /* CacheFile Channel */
 		animchannelTypeInfo[type++] = &ACF_DSCUR;        /* Curve Channel */
 		animchannelTypeInfo[type++] = &ACF_DSSKEY;       /* ShapeKey Channel */
 		animchannelTypeInfo[type++] = &ACF_DSWOR;        /* World Channel */