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, 22 insertions, 15 deletions

diff --git a/source/blender/compositor/intern/COM_Debug.cc b/source/blender/compositor/intern/COM_Debug.cc
index dfb4f53fee5..4cf7e09a7d8 100644
--- a/source/blender/compositor/intern/COM_Debug.cc
+++ b/source/blender/compositor/intern/COM_Debug.cc
@@ -211,12 +211,14 @@ int DebugInfo::graphviz_legend_group(
   return len;
 }
 
-int DebugInfo::graphviz_legend(char *str, int maxlen)
+int DebugInfo::graphviz_legend(char *str, int maxlen, const bool has_execution_groups)
 {
   int len = 0;
 
   len += snprintf(str + len, maxlen > len ? maxlen - len : 0, "{\r\n");
-  len += snprintf(str + len, maxlen > len ? maxlen - len : 0, "rank = sink;\r\n");
+  if (has_execution_groups) {
+    len += snprintf(str + len, maxlen > len ? maxlen - len : 0, "rank = sink;\r\n");
+  }
   len += snprintf(
       str + len, maxlen > len ? maxlen - len : 0, "Legend [shape=none, margin=0, label=<\r\n");
 
@@ -236,21 +238,24 @@ int DebugInfo::graphviz_legend(char *str, int maxlen)
       "Viewer", "lightskyblue3", str + len, maxlen > len ? maxlen - len : 0);
   len += graphviz_legend_color(
       "Active Viewer", "lightskyblue1", str + len, maxlen > len ? maxlen - len : 0);
-  len += graphviz_legend_color(
-      "Write Buffer", "darkorange", str + len, maxlen > len ? maxlen - len : 0);
-  len += graphviz_legend_color(
-      "Read Buffer", "darkolivegreen3", str + len, maxlen > len ? maxlen - len : 0);
+  if (has_execution_groups) {
+    len += graphviz_legend_color(
+        "Write Buffer", "darkorange", str + len, maxlen > len ? maxlen - len : 0);
+    len += graphviz_legend_color(
+        "Read Buffer", "darkolivegreen3", str + len, maxlen > len ? maxlen - len : 0);
+  }
   len += graphviz_legend_color(
       "Input Value", "khaki1", str + len, maxlen > len ? maxlen - len : 0);
 
-  len += snprintf(str + len, maxlen > len ? maxlen - len : 0, "<TR><TD></TD></TR>\r\n");
-
-  len += graphviz_legend_group(
-      "Group Waiting", "white", "dashed", str + len, maxlen > len ? maxlen - len : 0);
-  len += graphviz_legend_group(
-      "Group Running", "firebrick1", "solid", str + len, maxlen > len ? maxlen - len : 0);
-  len += graphviz_legend_group(
-      "Group Finished", "chartreuse4", "solid", str + len, maxlen > len ? maxlen - len : 0);
+  if (has_execution_groups) {
+    len += snprintf(str + len, maxlen > len ? maxlen - len : 0, "<TR><TD></TD></TR>\r\n");
+    len += graphviz_legend_group(
+        "Group Waiting", "white", "dashed", str + len, maxlen > len ? maxlen - len : 0);
+    len += graphviz_legend_group(
+        "Group Running", "firebrick1", "solid", str + len, maxlen > len ? maxlen - len : 0);
+    len += graphviz_legend_group(
+        "Group Finished", "chartreuse4", "solid", str + len, maxlen > len ? maxlen - len : 0);
+  }
 
   len += snprintf(str + len, maxlen > len ? maxlen - len : 0, "</TABLE>\r\n");
   len += snprintf(str + len, maxlen > len ? maxlen - len : 0, ">];\r\n");
@@ -387,7 +392,9 @@ bool DebugInfo::graphviz_system(const ExecutionSystem *system, char *str, int ma
     }
   }
 
-  len += graphviz_legend(str + len, maxlen > len ? maxlen - len : 0);
+  const bool has_execution_groups = system->getContext().get_execution_model() ==
+                                    eExecutionModel::Tiled;
+  len += graphviz_legend(str + len, maxlen > len ? maxlen - len : 0, has_execution_groups);
 
   len += snprintf(str + len, maxlen > len ? maxlen - len : 0, "}\r\n");