Use NodeCore's new spindata property

- Remove nodecore_filtered_lookup
  NodeCore now exposes this information,
  and turns out there was a bug in it, anyway.
- Move fix_rotatable_facedir to utility.lua
- Add sanity check to ensure spindata exists
- Depends on NodeCore `966ed012`

README.md

@@ -15,10 +15,6 @@ Rotating a node can be done in three ways:
 
 Sneaking while empty-handed inverts the direction of the rotation.
 
-At this time, nodes that can be rotated are hardcoded into the mod, since
-their valid orientations can't be determined just by their node definition.
-A function mimicking NodeCore's `node_spin_filtered` has to be provided.
-
 [Minetest]: https://www.minetest.net/
 [NodeCore]: https://content.minetest.net/packages/Warr1024/nodecore/
 [Extended Placement]: https://content.minetest.net/packages/gamefreq0/extended_placement/

init.lua

@@ -1,5 +1,5 @@
-local ipairs, ItemStack, vector, include, nodecore
-    = ipairs, ItemStack, vector, include, nodecore
+local ipairs, ItemStack, nodecore, include
+    = ipairs, ItemStack, nodecore, include
 
 rawset(_G, "nc_extended_rotating", {})
 nc_extended_rotating.hud      = include("hud")
@@ -9,6 +9,12 @@ nc_extended_rotating.entity   = include("entity")   -- Depends on `utility`.
 nc_extended_rotating.registry = include("registry") -- Depends on `rotate` and `state` (late).
 nc_extended_rotating.state    = include("state")    -- Depends on `registry`, `rotate` and `utility`.
 
+do
+    -- Do a quick check if we're using a compatible version of NodeCore.
+    local lens_def = minetest.registered_nodes["nc_optics:lens"]
+    if not lens_def.spindata then error("Requires NodeCore 966ed012 or later") end
+end
+
 -------------------------------------
 -- Register Player Update Function --
 -------------------------------------
@@ -30,24 +36,17 @@ nodecore.register_playerstep({
 -- Register Rotatable NodeCore Nodes --
 ---------------------------------------
 
-local nodecore_filtered_lookup = nc_extended_rotating.utility.nodecore_filtered_lookup
-local register_rotatable       = nc_extended_rotating.registry.register_rotatable;
+local register_rotatable = nc_extended_rotating.registry.register_rotatable;
 
 -- Register lenses.
-local LENS_FILTERED_LOOKUP = nodecore_filtered_lookup(function(a, b)
-    return vector.equals(a.f, b.f) end)
 for _, lens_state in ipairs({ "", "_on", "_glow", "_glow_start" }) do
-    register_rotatable("nc_optics:lens" .. lens_state, nil, LENS_FILTERED_LOOKUP) end
+    register_rotatable("nc_optics:lens" .. lens_state) end
 
 -- Register prisms.
-local PRISM_FILTERED_LOOKUP = nodecore_filtered_lookup(function(a, b)
-    return vector.equals(a.f, b.r) and vector.equals(a.r, b.f) end)
 for _, prism_state in ipairs({ "", "_on", "_gated" }) do
-    register_rotatable("nc_optics:prism" .. prism_state, nil, PRISM_FILTERED_LOOKUP) end
+    register_rotatable("nc_optics:prism" .. prism_state) end
 
 -- Register all existing and to-be-registered door panels.
-local PANEL_FILTERED_LOOKUP = nodecore_filtered_lookup(function(a, b)
-    return vector.equals(a.f, b.r) and vector.equals(a.r, b.f) end)
 nodecore.register_on_register_item({
     retroactive = true,
     func = function(name, def)
@@ -57,8 +56,8 @@ nodecore.register_on_register_item({
         if def.groups and def.groups.door then
             local panel = def.drop_in_place.name             -- The panel version of the door.
             local pin   = def.drop_non_silktouch or def.drop -- Dropped item is the door's pin.
-            register_rotatable(panel, nil, PANEL_FILTERED_LOOKUP,
-                function(_, _, _, item_stack) return ItemStack(item_stack):get_name() == pin end)
+            register_rotatable(panel, nil, function(_, _, _, item_stack)
+                return ItemStack(item_stack):get_name() == pin end)
         end
     end,
 })

registry.lua

@@ -29,7 +29,7 @@ end
 
 local rotate_node = nc_extended_rotating.rotate.rotate_node
 -- local get_rotating_state = nc_extended_rotating.state.get_rotating_state
-function registry.register_rotatable(name, def, facedir_lookup, rightclick_filter_func)
+function registry.register_rotatable(name, def, rightclick_filter_func)
     def = def or minetest.registered_nodes[name] or error("Unknown node '" .. name .. "'")
     if def.paramtype2 ~= "facedir" then error("Node '" .. name .. "' must be 'facedir'") end
 
@@ -49,7 +49,6 @@ function registry.register_rotatable(name, def, facedir_lookup, rightclick_filte
     end
 
     registered_rotatables[name] = {
-        facedir_lookup         = facedir_lookup,
         rightclick_filter_func = rightclick_filter_func,
     }
 end
@@ -67,16 +66,4 @@ function registry.is_rightclick_filtered(pos, node, player, item_stack, pointed_
        and entry.rightclick_filter_func(pos, node, player, item_stack, pointed_thing)
 end
 
--- Fixes facedir for the specified `node` when rotated to `facedir`.
--- * Returns `nil` if the node can't rotate this way.
--- * Returns `facedir` when the node can rotate this way.
--- * Returns another facedir when the node should rotate another equivalent way.
-function registry.fix_rotatable_facedir(node, facedir)
-    local name  = node and node.name or ""
-    local entry = registered_rotatables[name]
-    if not entry then return nil end
-    if not entry.facedir_lookup then return facedir end
-    return entry.facedir_lookup[facedir]
-end
-
 return registry

state.lua

@@ -1,10 +1,10 @@
 local math_round, minetest, vector
     = math.round, minetest, vector
 
-local fix_rotatable_facedir       = nc_extended_rotating.registry.fix_rotatable_facedir;
 local is_rightclick_filtered      = nc_extended_rotating.registry.is_rightclick_filtered;
 local is_rotatable                = nc_extended_rotating.registry.is_rotatable;
 local rotate_facedir              = nc_extended_rotating.rotate.rotate_facedir;
+local fix_rotatable_facedir       = nc_extended_rotating.utility.fix_rotatable_facedir;
 local rotation_vector_from_lookat = nc_extended_rotating.utility.rotation_vector_from_lookat;
 
 -- Distance at which we want to rotate by "pushing" on an edge.

utility.lua

@@ -44,17 +44,14 @@ function utility.rotation_vector_from_lookat(node, pointed_thing, edge_distance)
         return b - math_abs(p) <= edge_distance and math_sign(p) or 0 end)
 end
 
-function utility.nodecore_filtered_lookup(eq_func)
-    local lookup = {}
-    for i = 0, 23 do
-        local facedir = nodecore.facedirs[i]
-        for j = 0, #lookup - 1 do
-            local other = nodecore.facedirs[lookup[j]]
-            if eq_func(facedir, other) then lookup[i] = j; break end
-        end
-        lookup[i] = lookup[i] or i
-    end
-    return lookup
+-- NodeCore only has a couple of "canonical" orientations for its nodes.
+-- This returns a canonical facedir equivalent to the one passed in.
+function utility.fix_rotatable_facedir(node, facedir)
+    local name = node and node.name or ""
+    local def  = minetest.registered_nodes[name]
+    if not def then return nil end
+    if not def.spindata then return facedir end
+    return def.spindata.equiv[facedir]
 end
 
 return utility