1 files changed, 17 insertions, 6 deletions

diff --git a/source/blender/editors/sculpt_paint/paint_image.cc b/source/blender/editors/sculpt_paint/paint_image.cc
index 56cd4751881..c852fd25bc4 100644
--- a/source/blender/editors/sculpt_paint/paint_image.cc
+++ b/source/blender/editors/sculpt_paint/paint_image.cc
@@ -125,7 +125,7 @@ void ED_imapaint_dirty_region(
 
   imapaint_region_tiles(ibuf, x, y, w, h, &tilex, &tiley, &tilew, &tileh);
 
-  ListBase *undo_tiles = ED_image_paint_tile_list_get();
+  PaintTileMap *undo_tiles = ED_image_paint_tile_map_get();
 
   for (ty = tiley; ty <= tileh; ty++) {
     for (tx = tilex; tx <= tilew; tx++) {
@@ -158,11 +158,21 @@ void imapaint_image_update(
                                             imapaintpartial.dirty_region.xmax,
                                             imapaintpartial.dirty_region.ymax);
 
+  /* When buffer is partial updated the planes should be set to a larger value than 8. This will
+   * make sure that partial updating is working but uses more GPU memory as the gpu texture will
+   * have 4 channels. When so the whole texture needs to be reuploaded to the GPU using the new
+   * texture format. */
+  if (ibuf != nullptr && ibuf->planes == 8) {
+    ibuf->planes = 32;
+    BKE_image_partial_update_mark_full_update(image);
+    return;
+  }
+
   /* TODO: should set_tpage create ->rect? */
   if (texpaint || (sima && sima->lock)) {
     const int w = BLI_rcti_size_x(&imapaintpartial.dirty_region);
     const int h = BLI_rcti_size_y(&imapaintpartial.dirty_region);
-    /* Testing with partial update in uv editor too */
+    /* Testing with partial update in uv editor too. */
     BKE_image_update_gputexture(
         image, iuser, imapaintpartial.dirty_region.xmin, imapaintpartial.dirty_region.ymin, w, h);
   }
@@ -276,10 +286,11 @@ static bool image_paint_poll_ex(bContext *C, bool check_tool)
           (ID_IS_LINKED(sima->image) || ID_IS_OVERRIDE_LIBRARY(sima->image))) {
         return false;
       }
-      ARegion *region = CTX_wm_region(C);
-
-      if ((sima->mode == SI_MODE_PAINT) && region->regiontype == RGN_TYPE_WINDOW) {
-        return true;
+      if (sima->mode == SI_MODE_PAINT) {
+        const ARegion *region = CTX_wm_region(C);
+        if (region->regiontype == RGN_TYPE_WINDOW) {
+          return true;
+        }
       }
     }
   }