From e7875459d05955142d953a2a82b1d04e0fd0c86f Mon Sep 17 00:00:00 2001
From: Chenlei Hu <hcl@comfy.org>
Date: Thu, 20 Mar 2025 14:50:23 -0400
Subject: [PATCH] Add backend primitive nodes

---
 comfy_extras/nodes_primitive.py | 79 +++++++++++++++++++++++++++++++++
 nodes.py                        |  1 +
 2 files changed, 80 insertions(+)
 create mode 100644 comfy_extras/nodes_primitive.py

diff --git a/comfy_extras/nodes_primitive.py b/comfy_extras/nodes_primitive.py
new file mode 100644
index 00000000..90bc3562
--- /dev/null
+++ b/comfy_extras/nodes_primitive.py
@@ -0,0 +1,79 @@
+# Primitive nodes that are evaluated at backend.
+from __future__ import annotations
+
+from comfy.comfy_types.node_typing import ComfyNodeABC, InputTypeDict, IO
+
+
+class String(ComfyNodeABC):
+    @classmethod
+    def INPUT_TYPES(cls) -> InputTypeDict:
+        return {
+            "required": {"value": (IO.STRING, {})},
+        }
+
+    RETURN_TYPES = (IO.STRING,)
+    FUNCTION = "execute"
+    CATEGORY = "utils/primitive"
+
+    def execute(self, value: str) -> tuple[str]:
+        return (value,)
+
+
+class Int(ComfyNodeABC):
+    @classmethod
+    def INPUT_TYPES(cls) -> InputTypeDict:
+        return {
+            "required": {"value": (IO.INT, {})},
+        }
+
+    RETURN_TYPES = (IO.INT,)
+    FUNCTION = "execute"
+    CATEGORY = "utils/primitive"
+
+    def execute(self, value: int) -> tuple[int]:
+        return (value,)
+
+
+class Float(ComfyNodeABC):
+    @classmethod
+    def INPUT_TYPES(cls) -> InputTypeDict:
+        return {
+            "required": {"value": (IO.FLOAT, {})},
+        }
+
+    RETURN_TYPES = (IO.FLOAT,)
+    FUNCTION = "execute"
+    CATEGORY = "utils/primitive"
+
+    def execute(self, value: float) -> tuple[float]:
+        return (value,)
+
+
+class Boolean(ComfyNodeABC):
+    @classmethod
+    def INPUT_TYPES(cls) -> InputTypeDict:
+        return {
+            "required": {"value": (IO.BOOLEAN, {})},
+        }
+
+    RETURN_TYPES = (IO.BOOLEAN,)
+    FUNCTION = "execute"
+    CATEGORY = "utils/primitive"
+
+    def execute(self, value: bool) -> tuple[bool]:
+        return (value,)
+
+
+NODE_CLASS_MAPPINGS = {
+    "PrimitiveString": String,
+    "PrimitiveInt": Int,
+    "PrimitiveFloat": Float,
+    "PrimitiveBoolean": Boolean,
+}
+
+NODE_DISPLAY_NAME_MAPPINGS = {
+    "PrimitiveString": "String",
+    "PrimitiveInt": "Int",
+    "PrimitiveFloat": "Float",
+    "PrimitiveBoolean": "Boolean",
+}
diff --git a/nodes.py b/nodes.py
index f89c328e..a9c931df 100644
--- a/nodes.py
+++ b/nodes.py
@@ -2265,6 +2265,7 @@ def init_builtin_extra_nodes():
         "nodes_lumina2.py",
         "nodes_wan.py",
         "nodes_hunyuan3d.py",
+        "nodes_primitive.py",
     ]
 
     import_failed = []