81a63153d0
The depsgraph CoW mechanism is a bit of a misnomer. It creates an evaluated copy for data-blocks regardless of whether the copy will actually be written to. The point is to have physical separation between original and evaluated data. This is in contrast to the commonly used performance improvement of keeping a user count and copying data implicitly when it needs to be changed. In Blender code we call this "implicit sharing" instead. Importantly, the dependency graph has no idea about the _actual_ CoW behavior in Blender. Renaming this functionality in the despgraph removes some of the confusion that comes up when talking about this, and will hopefully make the depsgraph less confusing to understand initially too. Wording like "the evaluated copy" (as opposed to the original data-block) has also become common anyway. Pull Request: https://projects.blender.org/blender/blender/pulls/118338
119 lines
3.0 KiB
C++
119 lines
3.0 KiB
C++
/* SPDX-FileCopyrightText: 2017 Blender Authors
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
|
|
/** \file
|
|
* \ingroup depsgraph
|
|
*/
|
|
|
|
#include "intern/eval/deg_eval_runtime_backup.h"
|
|
|
|
#include "intern/eval/deg_eval_copy_on_write.h"
|
|
|
|
#include "BLI_utildefines.h"
|
|
|
|
#include "DRW_engine.hh"
|
|
|
|
namespace blender::deg {
|
|
|
|
RuntimeBackup::RuntimeBackup(const Depsgraph *depsgraph)
|
|
: have_backup(false),
|
|
id_data({nullptr}),
|
|
animation_backup(depsgraph),
|
|
scene_backup(depsgraph),
|
|
sound_backup(depsgraph),
|
|
object_backup(depsgraph),
|
|
drawdata_ptr(nullptr),
|
|
movieclip_backup(depsgraph),
|
|
volume_backup(depsgraph),
|
|
gpencil_backup(depsgraph)
|
|
{
|
|
drawdata_backup.first = drawdata_backup.last = nullptr;
|
|
}
|
|
|
|
void RuntimeBackup::init_from_id(ID *id)
|
|
{
|
|
if (!deg_eval_copy_is_expanded(id)) {
|
|
return;
|
|
}
|
|
have_backup = true;
|
|
|
|
/* Clear, so freeing the expanded data doesn't touch this Python reference. */
|
|
id_data.py_instance = id->py_instance;
|
|
id->py_instance = nullptr;
|
|
|
|
animation_backup.init_from_id(id);
|
|
|
|
const ID_Type id_type = GS(id->name);
|
|
switch (id_type) {
|
|
case ID_OB:
|
|
object_backup.init_from_object(reinterpret_cast<Object *>(id));
|
|
break;
|
|
case ID_SCE:
|
|
scene_backup.init_from_scene(reinterpret_cast<Scene *>(id));
|
|
break;
|
|
case ID_SO:
|
|
sound_backup.init_from_sound(reinterpret_cast<bSound *>(id));
|
|
break;
|
|
case ID_MC:
|
|
movieclip_backup.init_from_movieclip(reinterpret_cast<MovieClip *>(id));
|
|
break;
|
|
case ID_VO:
|
|
volume_backup.init_from_volume(reinterpret_cast<Volume *>(id));
|
|
break;
|
|
case ID_GD_LEGACY:
|
|
gpencil_backup.init_from_gpencil(reinterpret_cast<bGPdata *>(id));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Note that we never free GPU draw data from here since that's not
|
|
* safe for threading and draw data is likely to be re-used. */
|
|
drawdata_ptr = DRW_drawdatalist_from_id(id);
|
|
if (drawdata_ptr != nullptr) {
|
|
drawdata_backup = *drawdata_ptr;
|
|
drawdata_ptr->first = drawdata_ptr->last = nullptr;
|
|
}
|
|
}
|
|
|
|
void RuntimeBackup::restore_to_id(ID *id)
|
|
{
|
|
if (!have_backup) {
|
|
return;
|
|
}
|
|
|
|
id->py_instance = id_data.py_instance;
|
|
|
|
animation_backup.restore_to_id(id);
|
|
|
|
const ID_Type id_type = GS(id->name);
|
|
switch (id_type) {
|
|
case ID_OB:
|
|
object_backup.restore_to_object(reinterpret_cast<Object *>(id));
|
|
break;
|
|
case ID_SCE:
|
|
scene_backup.restore_to_scene(reinterpret_cast<Scene *>(id));
|
|
break;
|
|
case ID_SO:
|
|
sound_backup.restore_to_sound(reinterpret_cast<bSound *>(id));
|
|
break;
|
|
case ID_MC:
|
|
movieclip_backup.restore_to_movieclip(reinterpret_cast<MovieClip *>(id));
|
|
break;
|
|
case ID_VO:
|
|
volume_backup.restore_to_volume(reinterpret_cast<Volume *>(id));
|
|
break;
|
|
case ID_GD_LEGACY:
|
|
gpencil_backup.restore_to_gpencil(reinterpret_cast<bGPdata *>(id));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
if (drawdata_ptr != nullptr) {
|
|
*drawdata_ptr = drawdata_backup;
|
|
}
|
|
}
|
|
|
|
} // namespace blender::deg
|