Fix T85010: Cycles viewport not showing certain material changes when using GPU compute

Modifications to triangle shader association were not considered when checking for updates and the associated device data array was not tagged as modified so it was not resent to the device(s).

1 files changed, 4 insertions, 3 deletions

diff --git a/intern/cycles/render/geometry.cpp b/intern/cycles/render/geometry.cpp
index beee0b797ee..b6fe8a66b87 100644
--- a/intern/cycles/render/geometry.cpp
+++ b/intern/cycles/render/geometry.cpp
@@ -1532,7 +1532,7 @@ void GeometryManager::device_update_preprocess(Device *device, Scene *scene, Pro
       if (mesh->need_update_rebuild) {
         device_update_flags |= DEVICE_MESH_DATA_NEEDS_REALLOC;
       }
-      else if (mesh->verts_is_modified()) {
+      else if (mesh->is_modified()) {
         device_update_flags |= DEVICE_MESH_DATA_MODIFIED;
       }
     }
@@ -1612,9 +1612,10 @@ void GeometryManager::device_update_preprocess(Device *device, Scene *scene, Pro
   }
 
   if (device_update_flags & DEVICE_MESH_DATA_MODIFIED) {
-    /* if anything else than vertices are modified, we would need to reallocate, so this is the
-     * only array that can be updated */
+    /* if anything else than vertices or shaders are modified, we would need to reallocate, so
+     * these are the only arrays that can be updated */
     dscene->tri_vnormal.tag_modified();
+    dscene->tri_shader.tag_modified();
   }
 
   if (device_update_flags & DEVICE_CURVE_DATA_MODIFIED) {