Draw manager: Listen to depsgraph's ID update callbacks

This replaces dedicated flag which wasn't clean who sets it and who clears it,
and which was also trying to re-implement existing functionality in a way.

Flushing is not currently very efficient but there are ways to speed this up
a lot, but needs more investigation.

1 files changed, 39 insertions, 2 deletions

diff --git a/source/blender/editors/render/render_update.c b/source/blender/editors/render/render_update.c
index bd2acb1c8bd..a391b13a000 100644
--- a/source/blender/editors/render/render_update.c
+++ b/source/blender/editors/render/render_update.c
@@ -539,7 +539,9 @@ void ED_render_id_flush_update(const DEGEditorUpdateContext *update_ctx, ID *id)
 		return;
 	}
 	Main *bmain = update_ctx->bmain;
-
+	Scene *scene = update_ctx->scene;
+	ViewLayer *view_layer = update_ctx->view_layer;
+	/* Internal ID update handlers. */
 	switch (GS(id->name)) {
 		case ID_MA:
 			material_changed(bmain, (Material *)id);
@@ -565,7 +567,42 @@ void ED_render_id_flush_update(const DEGEditorUpdateContext *update_ctx, ID *id)
 			render_engine_flag_changed(bmain, RE_ENGINE_UPDATE_OTHER);
 			break;
 	}
-	
+	/* Inform all draw managers about changes.
+	 *
+	 * TODO(sergey): This code is run for every updated ID, via flushing
+	 * mechanism. How can we avoid iterating over the whole interface for
+	 * every of those IDs? One of the ideas would be to call draw manager's
+	 * ID update which is not bound to any of contexts.
+	 */
+	{
+		wmWindowManager *wm = bmain->wm.first;
+		for (wmWindow *win = wm->windows.first; win; win = win->next) {
+			bScreen *sc = WM_window_get_active_screen(win);
+			WorkSpace *workspace = BKE_workspace_active_get(win->workspace_hook);
+			ViewRender *view_render = BKE_viewrender_get(win->scene, workspace);
+			for (ScrArea *sa = sc->areabase.first; sa; sa = sa->next) {
+				if (sa->spacetype != SPACE_VIEW3D) {
+					continue;
+				}
+				for (ARegion *ar = sa->regionbase.first; ar; ar = ar->next) {
+					if (ar->regiontype != RGN_TYPE_WINDOW) {
+						continue;
+					}
+					RenderEngineType *engine_type = RE_engines_find(view_render->engine_id);
+					DRW_notify_id_update(
+					        (&(DRWUpdateContext){
+					            .bmain = bmain,
+					            .scene = scene,
+					            .view_layer = view_layer,
+					            .ar = ar,
+					            .v3d = (View3D *)sa->spacedata.first,
+					            .engine_type = engine_type
+					        }),
+					        id);
+				}
+			}
+		}
+	}
 }