Cleanup: Nodes: Begin splitting shader node buttons into individual files

Currently, most node buttons are defined in `drawnode.cc` however,
this is inconvenient because it requires editing many files when adding new nodes.
The goal is to minimize the number of files needed to add or update a node.

This commit moves most of the node layout functions for shader nodes into their respected
source/blender/nodes/shader/nodes file.

In the future, these functions will be simplified to node_layout.

Some nodes were left in `drawnode.cc` as this would require duplicating code
while this is likely fine it is best to leave that to a seperate commit.

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/nodes/shader/nodes/node_shader_clamp.cc b/source/blender/nodes/shader/nodes/node_shader_clamp.cc
index f4c72f0616f..4d9cfc372ab 100644
--- a/source/blender/nodes/shader/nodes/node_shader_clamp.cc
+++ b/source/blender/nodes/shader/nodes/node_shader_clamp.cc
@@ -23,6 +23,9 @@
 
 #include "node_shader_util.hh"
 
+#include "UI_interface.h"
+#include "UI_resources.h"
+
 namespace blender::nodes::node_shader_clamp_cc {
 
 static void sh_node_clamp_declare(NodeDeclarationBuilder &b)
@@ -34,6 +37,11 @@ static void sh_node_clamp_declare(NodeDeclarationBuilder &b)
   b.add_output<decl::Float>(N_("Result"));
 };
 
+static void node_shader_buts_clamp(uiLayout *layout, bContext *UNUSED(C), PointerRNA *ptr)
+{
+  uiItemR(layout, ptr, "clamp_type", UI_ITEM_R_SPLIT_EMPTY_NAME, "", ICON_NONE);
+}
+
 static void node_shader_init_clamp(bNodeTree *UNUSED(ntree), bNode *node)
 {
   node->custom1 = NODE_CLAMP_MINMAX; /* clamp type */
@@ -83,6 +91,7 @@ void register_node_type_sh_clamp()
 
   sh_fn_node_type_base(&ntype, SH_NODE_CLAMP, "Clamp", NODE_CLASS_CONVERTER);
   ntype.declare = file_ns::sh_node_clamp_declare;
+  ntype.draw_buttons = file_ns::node_shader_buts_clamp;
   node_type_init(&ntype, file_ns::node_shader_init_clamp);
   node_type_gpu(&ntype, file_ns::gpu_shader_clamp);
   ntype.build_multi_function = file_ns::sh_node_clamp_build_multi_function;