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, 4 insertions, 1 deletions

diff --git a/source/blender/compositor/nodes/COM_TranslateNode.cc b/source/blender/compositor/nodes/COM_TranslateNode.cc
index 922393f006a..1b2ce341a66 100644
--- a/source/blender/compositor/nodes/COM_TranslateNode.cc
+++ b/source/blender/compositor/nodes/COM_TranslateNode.cc
@@ -56,7 +56,10 @@ void TranslateNode::convertToOperations(NodeConverter &converter,
   converter.mapInputSocket(inputYSocket, operation->getInputSocket(2));
   converter.mapOutputSocket(outputSocket, operation->getOutputSocket(0));
 
-  if (data->wrap_axis) {
+  /* FullFrame does not support using WriteBufferOperation.
+   * TODO: Implement TranslateOperation with wrap support in FullFrame.
+   */
+  if (data->wrap_axis && context.get_execution_model() != eExecutionModel::FullFrame) {
     WriteBufferOperation *writeOperation = new WriteBufferOperation(DataType::Color);
     WrapOperation *wrapOperation = new WrapOperation(DataType::Color);
     wrapOperation->setMemoryProxy(writeOperation->getMemoryProxy());