OpenSubdiv: Prepare majority of things to have proper subdivided UV

Mainly the changes are related on establishing API to feed UV islands
to OpenSubdiv, so it will know all the connectivity information and
will be able to do proper interpolation.

Island calculation is currently rather slow, not sure how to make it
fast and not use lots of allocations.

Shouldn't be THAT bad, since this code is only runs once when creating
OSD mesh, and it's probably still faster than our orientation code.

1 files changed, 10 insertions, 4 deletions

diff --git a/intern/opensubdiv/opensubdiv_converter_capi.h b/intern/opensubdiv/opensubdiv_converter_capi.h
index 47c8dab49de..4448f108e8a 100644
--- a/intern/opensubdiv/opensubdiv_converter_capi.h
+++ b/intern/opensubdiv/opensubdiv_converter_capi.h
@@ -86,10 +86,16 @@ typedef struct OpenSubdiv_Converter {
 	/* Face-varying data. */
 
 	int (*get_num_uv_layers)(const OpenSubdiv_Converter *converter);
-	void (*get_face_corner_uv)(const OpenSubdiv_Converter *converter,
-	                           int face,
-	                           int corner,
-	                           float r_uv[2]);
+
+	void (*precalc_uv_layer)(const OpenSubdiv_Converter *converter, int layer);
+	void (*finish_uv_layer)(const OpenSubdiv_Converter *converter);
+
+	int (*get_num_uvs)(const OpenSubdiv_Converter *converter);
+	void (*get_uvs)(const OpenSubdiv_Converter *converter, float *uvs);
+
+	int (*get_face_corner_uv_index)(const OpenSubdiv_Converter *converter,
+	                                int face,
+	                                int corner);
 
 	void (*free_user_data)(const OpenSubdiv_Converter *converter);
 	void *user_data;