1 files changed, 107 insertions, 0 deletions
diff --git a/source/blender/io/alembic/exporter/abc_subdiv_disabler.cc b/source/blender/io/alembic/exporter/abc_subdiv_disabler.cc
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+++ b/source/blender/io/alembic/exporter/abc_subdiv_disabler.cc
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+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2020 Blender Foundation.
+ * All rights reserved.
+ */
+#include "abc_subdiv_disabler.h"
+
+#include <stdio.h>
+
+#include "BLI_listbase.h"
+
+#include "DEG_depsgraph.h"
+#include "DEG_depsgraph_query.h"
+
+#include "DNA_layer_types.h"
+#include "DNA_mesh_types.h"
+#include "DNA_modifier_types.h"
+#include "DNA_object_types.h"
+
+#include "BKE_modifier.h"
+
+namespace blender {
+namespace io {
+namespace alembic {
+
+SubdivModifierDisabler::SubdivModifierDisabler(Depsgraph *depsgraph) : depsgraph_(depsgraph)
+{
+}
+
+SubdivModifierDisabler::~SubdivModifierDisabler()
+{
+  for (ModifierData *modifier : disabled_modifiers_) {
+    modifier->mode &= ~eModifierMode_DisableTemporary;
+  }
+}
+
+void SubdivModifierDisabler::disable_modifiers()
+{
+  Scene *scene = DEG_get_input_scene(depsgraph_);
+  ViewLayer *view_layer = DEG_get_input_view_layer(depsgraph_);
+
+  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+    Object *object = base->object;
+
+    if (object->type != OB_MESH) {
+      continue;
+    }
+
+    ModifierData *subdiv = get_subdiv_modifier(scene, object);
+    if (subdiv == nullptr) {
+      continue;
+    }
+
+    /* This disables more modifiers than necessary, as it doesn't take restrictions like
+     * "export selected objects only" into account. However, with the subsurfs disabled,
+     * moving to a different frame is also going to be faster, so in the end this is probably
+     * a good thing to do. */
+    subdiv->mode |= eModifierMode_DisableTemporary;
+    disabled_modifiers_.insert(subdiv);
+    DEG_id_tag_update(&object->id, ID_RECALC_GEOMETRY);
+  }
+}
+
+/* Check if the mesh is a subsurf, ignoring disabled modifiers and
+ * displace if it's after subsurf. */
+ModifierData *SubdivModifierDisabler::get_subdiv_modifier(Scene *scene, Object *ob)
+{
+  ModifierData *md = static_cast<ModifierData *>(ob->modifiers.last);
+
+  for (; md; md = md->prev) {
+    if (!BKE_modifier_is_enabled(scene, md, eModifierMode_Render)) {
+      continue;
+    }
+
+    if (md->type == eModifierType_Subsurf) {
+      SubsurfModifierData *smd = reinterpret_cast<SubsurfModifierData *>(md);
+
+      if (smd->subdivType == ME_CC_SUBSURF) {
+        return md;
+      }
+    }
+
+    /* mesh is not a subsurf. break */
+    if ((md->type != eModifierType_Displace) && (md->type != eModifierType_ParticleSystem)) {
+      return nullptr;
+    }
+  }
+
+  return nullptr;
+}
+
+}  // namespace alembic
+}  // namespace io
+}  // namespace blender