@@ -317,2 +317,4 @@
 };
 
+class NamedLayerSelectionFieldInput final : public bke::GeometryFieldInput {
+  std::string layer_name_;

@@ -319,0 +321,4 @@
+
+ public:
+  NamedLayerSelectionFieldInput(const std::string layer_name)
+      : bke::GeometryFieldInput(CPPType::get<bool>(), "Named Layer node"), layer_name_(layer_name)

@@ -0,0 +16,4 @@
+
+static void node_geo_exec(GeoNodeExecParams params)
+{
+  const std::string name = params.extract_input<std::string>("Name");

@@ -0,0 +22,4 @@
+    return;
+  }
+
+  Field<bool> selection_field{std::make_shared<blender::bke::NamedLayerSelectionFieldInput>(name)};

@@ -2415,6 +2430,35 @@ blender::bke::greasepencil::LayerGroup *GreasePencil::find_layer_group_by_name(
   return this->root_group().find_group_by_name(name);
 }
 
+blender::Vector<int> GreasePencil::find_layer_index_by_name(

@@ -2418,0 +2436,4 @@
+  using namespace blender::bke::greasepencil;
+  blender::Vector<blender::StringRef> layer_name_vector;
+
+  const LayerGroup *layer_group = this->find_layer_group_by_name(name);

@@ -2418,0 +2444,4 @@
+    layer_name_vector.append(name);
+  }
+
+  blender::Vector<int> layer_index_vector;

@@ -2418,0 +2447,4 @@
+  blender::Vector<int> layer_index_vector;
+  for (const int layer_index : this->layers().index_range()) {
+    const Layer &layer = *this->layers()[layer_index];
+    if (!layer_name_vector.contains(blender::StringRef(layer.name()))) {

@@ -64,8 +64,9 @@ typedef enum NodeTreeInterfaceSocketFlag {
   NODE_INTERFACE_SOCKET_HIDE_IN_MODIFIER = 1 << 3,
   NODE_INTERFACE_SOCKET_COMPACT = 1 << 4,
   NODE_INTERFACE_SOCKET_SINGLE_VALUE_ONLY = 1 << 5,
+  NODE_INTERFACE_SOCKET_LAYER = 1 << 6,

@@ -514,0 +514,4 @@
+  /**
+   * Returns a `Vector` of names of all the layers within this group.
+   */
+  Vector<StringRef> layer_names() const;

@@ -529,0 +548,4 @@
+
+  if (domain == ATTR_DOMAIN_LAYER) {
+    Array<bool> selection(mask.min_array_size(), false);
+    mask.foreach_index([&](const int64_t i) { selection[i] = true; });

@@ -2388,0 +2413,4 @@
+    const int64_t index = this->layers().first_index(&node->as_layer());
+    return blender::IndexMask::from_indices(Span{index}, memory);
+  }
+

@@ -318,1 +318,4 @@
 
+class NamedLayerSelectionFieldInput final : public bke::GeometryFieldInput {
+ private:
+  const std::string layer_name_;

@@ -0,0 +23,4 @@
+  }
+
+  Field<bool> selection_field{
+      std::make_shared<blender::bke::NamedLayerSelectionFieldInput>(std::move(name))};

@@ -0,0 +25,4 @@
+  Field<bool> selection_field{
+      std::make_shared<blender::bke::NamedLayerSelectionFieldInput>(std::move(name))};
+  params.set_output("Selection", std::move(selection_field));
+  return;

@@ -121,1 +121,4 @@
     case SOCK_BOOLEAN: {
+      if (socket.is_layer_selection_field()) {
+        /* It is basically a SOCK_STRING minus trying to re-use the previous value
+         * Otherwise we get spurious data, since the previous type was SOCK_BOOLEAN. */

@@ -319,0 +321,4 @@
+  std::string layer_name_;
+
+ public:
+  NamedLayerSelectionFieldInput(const std::string layer_name)

@@ -529,0 +557,4 @@
+  }
+
+  Array<bool> selection(mask.min_array_size(), true);
+  return VArray<bool>::ForContainer(std::move(selection));