Compositor: Full-frame base system

This patch adds the base code needed to make the full-frame system work for both current tiled/per-pixel implementation of operations and full-frame.

Two execution models:
- Tiled: Current implementation. Renders execution groups in tiles from outputs to input. Not all operations are buffered. Runs the tiled/per-pixel implementation.
- FullFrame: All operations are buffered. Fully renders operations from inputs to outputs. Runs full-frame implementation of operations if available otherwise the current tiled/per-pixel. Creates output buffers on first read and free them as soon as all its readers have finished, reducing peak memory usage of complex/long trees. Operations are multi-threaded but do not run in parallel as Tiled (will be done in another patch).

This should allow us to convert operations to full-frame in small steps with the system already working and solve the problem of high memory usage.

FullFrame breaking changes respect Tiled system, mainly:
- Translate, Rotate, Scale, and Transform take effect immediately instead of next buffered operation.
- Any sampling is always done over inputs instead of last buffered operation.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D11113

1 files changed, 48 insertions, 0 deletions

diff --git a/source/blender/compositor/intern/COM_ExecutionModel.cc b/source/blender/compositor/intern/COM_ExecutionModel.cc
new file mode 100644
index 00000000000..4d7f62e091b
--- /dev/null
+++ b/source/blender/compositor/intern/COM_ExecutionModel.cc
@@ -0,0 +1,48 @@
+/*
+ * 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.
+ *
+ * Copyright 2021, Blender Foundation.
+ */
+
+#include "COM_ExecutionModel.h"
+
+namespace blender::compositor {
+
+ExecutionModel::ExecutionModel(CompositorContext &context, Span<NodeOperation *> operations)
+    : context_(context), operations_(operations)
+{
+  const bNodeTree *node_tree = context_.getbNodeTree();
+
+  const rctf *viewer_border = &node_tree->viewer_border;
+  border_.use_viewer_border = (node_tree->flag & NTREE_VIEWER_BORDER) &&
+                              viewer_border->xmin < viewer_border->xmax &&
+                              viewer_border->ymin < viewer_border->ymax;
+  border_.viewer_border = viewer_border;
+
+  const RenderData *rd = context_.getRenderData();
+  /* Case when cropping to render border happens is handled in
+   * compositor output and render layer nodes. */
+  border_.use_render_border = context.isRendering() && (rd->mode & R_BORDER) &&
+                              !(rd->mode & R_CROP);
+  border_.render_border = &rd->border;
+}
+
+bool ExecutionModel::is_breaked() const
+{
+  const bNodeTree *btree = context_.getbNodeTree();
+  return btree->test_break(btree->tbh);
+}
+
+}  // namespace blender::compositor