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, 13 insertions, 0 deletions

diff --git a/source/blender/compositor/intern/COM_WorkPackage.h b/source/blender/compositor/intern/COM_WorkPackage.h
index 28aa746fdc4..4d503022120 100644
--- a/source/blender/compositor/intern/COM_WorkPackage.h
+++ b/source/blender/compositor/intern/COM_WorkPackage.h
@@ -22,6 +22,7 @@
 
 #include "BLI_rect.h"
 
+#include <functional>
 #include <ostream>
 
 namespace blender::compositor {
@@ -33,6 +34,8 @@ class ExecutionGroup;
  * \see WorkScheduler
  */
 struct WorkPackage {
+  eWorkPackageType type;
+
   eWorkPackageState state = eWorkPackageState::NotScheduled;
 
   /**
@@ -50,6 +53,16 @@ struct WorkPackage {
    */
   rcti rect;
 
+  /**
+   * Custom function to execute when work package type is CustomFunction.
+   */
+  std::function<void()> execute_fn;
+
+  /**
+   * Called when work execution is finished.
+   */
+  std::function<void()> executed_fn;
+
 #ifdef WITH_CXX_GUARDEDALLOC
   MEM_CXX_CLASS_ALLOC_FUNCS("COM:WorkPackage")
 #endif