Textures: Support UDIM images

This adds UDIM support to e.g. the Displacement modifier.

The implementation is straightforward: If the image is tiled, lookup the
tile based on UVs and shift the UVs into the tile's coordinates.

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/image.c b/source/blender/blenkernel/intern/image.c
index fca81acf038..6d6e5166e1c 100644
--- a/source/blender/blenkernel/intern/image.c
+++ b/source/blender/blenkernel/intern/image.c
@@ -4652,6 +4652,9 @@ static void image_get_entry_and_index(Image *ima, ImageUser *iuser, int *r_entry
       frame = iuser ? iuser->framenr : ima->lastframe;
     }
   }
+  else if (ima->source == IMA_SRC_TILED) {
+    frame = (iuser && iuser->tile) ? iuser->tile : 1001;
+  }
 
   *r_entry = frame;
   *r_index = index;