Fix T65447: Mask doesn't update in compositor unless there's motion blur on

This is probably just one of the related issues.

Root of the problem was that compositor job was using original scene and node
tree for compositing. It is not guaranteed to have all the evaluated data.

Switched compositor job to use it's own render-pipeline-like dependency graph
which has everything evaluated in it.

Reviewers: brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4998

1 files changed, 36 insertions, 0 deletions

diff --git a/source/blender/depsgraph/intern/depsgraph_build.cc b/source/blender/depsgraph/intern/depsgraph_build.cc
index 138b23888b4..cf1ebccc6c6 100644
--- a/source/blender/depsgraph/intern/depsgraph_build.cc
+++ b/source/blender/depsgraph/intern/depsgraph_build.cc
@@ -315,6 +315,42 @@ void DEG_graph_build_for_render_pipeline(Depsgraph *graph,
   }
 }
 
+void DEG_graph_build_for_compositor_preview(Depsgraph *graph,
+                                            Main *bmain,
+                                            Scene *scene,
+                                            struct ViewLayer * /*view_layer*/,
+                                            bNodeTree *nodetree)
+{
+  double start_time = 0.0;
+  if (G.debug & (G_DEBUG_DEPSGRAPH_BUILD | G_DEBUG_DEPSGRAPH_TIME)) {
+    start_time = PIL_check_seconds_timer();
+  }
+  DEG::Depsgraph *deg_graph = reinterpret_cast<DEG::Depsgraph *>(graph);
+  /* Perform sanity checks. */
+  BLI_assert(deg_graph->scene == scene);
+  deg_graph->is_render_pipeline_depsgraph = true;
+  DEG::DepsgraphBuilderCache builder_cache;
+  /* Generate all the nodes in the graph first */
+  DEG::DepsgraphNodeBuilder node_builder(bmain, deg_graph, &builder_cache);
+  node_builder.begin_build();
+  node_builder.build_scene_render(scene);
+  node_builder.build_nodetree(nodetree);
+  node_builder.end_build();
+  /* Hook up relationships between operations - to determine evaluation
+   * order. */
+  DEG::DepsgraphRelationBuilder relation_builder(bmain, deg_graph, &builder_cache);
+  relation_builder.begin_build();
+  relation_builder.build_scene_render(scene);
+  relation_builder.build_nodetree(nodetree);
+  relation_builder.build_copy_on_write_relations();
+  /* Finalize building. */
+  graph_build_finalize_common(deg_graph, bmain);
+  /* Finish statistics. */
+  if (G.debug & (G_DEBUG_DEPSGRAPH_BUILD | G_DEBUG_DEPSGRAPH_TIME)) {
+    printf("Depsgraph built in %f seconds.\n", PIL_check_seconds_timer() - start_time);
+  }
+}
+
 /* Tag graph relations for update. */
 void DEG_graph_tag_relations_update(Depsgraph *graph)
 {