Realtime Compositor: Allow inputs to skip realization

This patch adds support for the skip realization option of the input
descriptor. Inputs that request skip realization will not be realized on
the operation domain of the operation and will not contribute to its
computation, and consequently, they can't be a domain input.

An example is the bokeh input of the Bokeh Blur node, which is actually
a resource that is decoupled from the rest of the inputs and should not
affect or be affected by their domain.

Differential Revision: https://developer.blender.org/D15767

Reviewed By: Clement Foucault

3 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/compositor/realtime_compositor/intern/compile_state.cc b/source/blender/compositor/realtime_compositor/intern/compile_state.cc
index 97c1e47e86e..5fa2fc9d544 100644
--- a/source/blender/compositor/realtime_compositor/intern/compile_state.cc
+++ b/source/blender/compositor/realtime_compositor/intern/compile_state.cc
@@ -149,6 +149,11 @@ Domain CompileState::compute_shader_node_domain(DNode node)
       continue;
     }
 
+    /* An input that skips realization can't be a domain input. */
+    if (input_descriptor.skip_realization) {
+      continue;
+    }
+
     /* Notice that the lower the domain priority value is, the higher the priority is, hence the
      * less than comparison. */
     if (input_descriptor.domain_priority < current_domain_priority) {
diff --git a/source/blender/compositor/realtime_compositor/intern/operation.cc b/source/blender/compositor/realtime_compositor/intern/operation.cc
index fb02807d729..832196cc5ef 100644
--- a/source/blender/compositor/realtime_compositor/intern/operation.cc
+++ b/source/blender/compositor/realtime_compositor/intern/operation.cc
@@ -66,6 +66,11 @@ Domain Operation::compute_domain()
       continue;
     }
 
+    /* An input that skips realization can't be a domain input. */
+    if (descriptor.skip_realization) {
+      continue;
+    }
+
     /* Notice that the lower the domain priority value is, the higher the priority is, hence the
      * less than comparison. */
     if (descriptor.domain_priority < current_domain_priority) {
diff --git a/source/blender/compositor/realtime_compositor/intern/utilities.cc b/source/blender/compositor/realtime_compositor/intern/utilities.cc
index 2e1baec98a8..1a5823b8441 100644
--- a/source/blender/compositor/realtime_compositor/intern/utilities.cc
+++ b/source/blender/compositor/realtime_compositor/intern/utilities.cc
@@ -116,6 +116,7 @@ InputDescriptor input_descriptor_from_input_socket(const bNodeSocket *socket)
   }
   const SocketDeclarationPtr &socket_declaration = node_declaration->inputs()[socket->index()];
   input_descriptor.domain_priority = socket_declaration->compositor_domain_priority();
+  input_descriptor.skip_realization = socket_declaration->compositor_skip_realization();
   input_descriptor.expects_single_value = socket_declaration->compositor_expects_single_value();
   return input_descriptor;
 }