Cleanup: Add macro and functions for node storage

The `node_storage` functions to retrieve const and mutable structs
from a node are generated by a short macro that can be placed at the
top of each relevant file. I use this in D8286 to make code snippets
in the socket declarations much shorter, but I thought it would be
good to use it consistently everywhere else too.

The functions are also useful to avoid copy and paste errors,
like the one corrected in the cylinder node in this commit.

Differential Revision: https://developer.blender.org/D13491

1 files changed, 6 insertions, 5 deletions

diff --git a/source/blender/nodes/geometry/nodes/node_geo_points_to_volume.cc b/source/blender/nodes/geometry/nodes/node_geo_points_to_volume.cc
index 0a7d2aa198c..c356e1cf22b 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_points_to_volume.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_points_to_volume.cc
@@ -30,6 +30,8 @@
 
 namespace blender::nodes::node_geo_points_to_volume_cc {
 
+NODE_STORAGE_FUNCS(NodeGeometryPointsToVolume)
+
 static void node_declare(NodeDeclarationBuilder &b)
 {
   b.add_input<decl::Geometry>(N_("Points"));
@@ -61,16 +63,16 @@ static void node_init(bNodeTree *UNUSED(ntree), bNode *node)
 
 static void node_update(bNodeTree *ntree, bNode *node)
 {
-  NodeGeometryPointsToVolume *data = (NodeGeometryPointsToVolume *)node->storage;
+  const NodeGeometryPointsToVolume &storage = node_storage(*node);
   bNodeSocket *voxel_size_socket = nodeFindSocket(node, SOCK_IN, "Voxel Size");
   bNodeSocket *voxel_amount_socket = nodeFindSocket(node, SOCK_IN, "Voxel Amount");
   nodeSetSocketAvailability(ntree,
                             voxel_amount_socket,
-                            data->resolution_mode ==
+                            storage.resolution_mode ==
                                 GEO_NODE_POINTS_TO_VOLUME_RESOLUTION_MODE_AMOUNT);
   nodeSetSocketAvailability(ntree,
                             voxel_size_socket,
-                            data->resolution_mode ==
+                            storage.resolution_mode ==
                                 GEO_NODE_POINTS_TO_VOLUME_RESOLUTION_MODE_SIZE);
 }
 
@@ -134,8 +136,7 @@ static float compute_voxel_size(const GeoNodeExecParams &params,
                                 Span<float3> positions,
                                 const float radius)
 {
-  const NodeGeometryPointsToVolume &storage =
-      *(const NodeGeometryPointsToVolume *)params.node().storage;
+  const NodeGeometryPointsToVolume &storage = node_storage(params.node());
 
   if (storage.resolution_mode == GEO_NODE_POINTS_TO_VOLUME_RESOLUTION_MODE_SIZE) {
     return params.get_input<float>("Voxel Size");