Particles: initial support for events and actions

The following nodes work now (although things can still be improved of course):
Particle Birth Event, Praticle Time Step Event, Set Particle Attribute and Execute Condition.

Multiple Set Particle Attribute nodes can be chained using the "Execute" sockets.
They will be executed from left to right.

1 files changed, 8 insertions, 3 deletions

diff --git a/source/blender/functions/intern/attributes_ref.cc b/source/blender/functions/intern/attributes_ref.cc
index 7bfcc69671a..4686e217911 100644
--- a/source/blender/functions/intern/attributes_ref.cc
+++ b/source/blender/functions/intern/attributes_ref.cc
@@ -25,7 +25,7 @@ AttributesInfoBuilder::~AttributesInfoBuilder()
   }
 }
 
-void AttributesInfoBuilder::add(StringRef name, const CPPType &type, const void *default_value)
+bool AttributesInfoBuilder::add(StringRef name, const CPPType &type, const void *default_value)
 {
   if (names_.add_as(name)) {
     types_.append(&type);
@@ -36,10 +36,15 @@ void AttributesInfoBuilder::add(StringRef name, const CPPType &type, const void
     void *dst = allocator_.allocate(type.size(), type.alignment());
     type.copy_to_uninitialized(default_value, dst);
     defaults_.append(dst);
+    return true;
   }
   else {
-    /* The same name can be added more than once as long as the type is always the same. */
-    BLI_assert(types_[names_.index_of_as(name)] == &type);
+    const CPPType &stored_type = *types_[names_.index_of_as(name)];
+    if (stored_type != type) {
+      std::cout << "Warning: Tried to add an attribute twice with different types (" << name
+                << ": " << stored_type.name() << ", " << type.name() << ").\n";
+    }
+    return false;
   }
 }