Add upside down slabs and stairs

diff --git a/mods/stairs/init.lua b/mods/stairs/init.lua
index 1be5f5b5411a3460aacf4f8d150fc243ab907319..3e7f927d1b11d519ad70c9fb750cc9cb0b385fcb 100644 (file)
--- a/mods/stairs/init.lua
+++ b/mods/stairs/init.lua
@@ -21,6 +21,43 @@ function stairs.register_stair(subname, recipeitem, groups, images, description,
                                {-0.5, 0, 0, 0.5, 0.5, 0.5},
                        },
                },
+               on_place = function(itemstack, placer, pointed_thing)
+                       if pointed_thing.type ~= "node" then
+                               return itemstack
+                       end
+                       
+                       local p0 = pointed_thing.under
+                       local p1 = pointed_thing.above
+                       if p0.y-1 == p1.y then
+                               local fakestack = ItemStack("stairs:stair_" .. subname.."upside_down")
+                               local ret = minetest.item_place(fakestack, placer, pointed_thing)
+                               if ret:is_empty() then
+                                       itemstack:take_item()
+                                       return itemstack
+                               end
+                       end
+                       
+                       -- Otherwise place regularly
+                       return minetest.item_place(itemstack, placer, pointed_thing)
+               end,
+       })
+       
+       minetest.register_node("stairs:stair_" .. subname.."upside_down", {
+               drop = "stairs:stair_" .. subname,
+               drawtype = "nodebox",
+               tiles = images,
+               paramtype = "light",
+               paramtype2 = "facedir",
+               is_ground_content = true,
+               groups = groups,
+               sounds = sounds,
+               node_box = {
+                       type = "fixed",
+                       fixed = {
+                               {-0.5, 0, -0.5, 0.5, 0.5, 0.5},
+                               {-0.5, -0.5, 0, 0.5, 0, 0.5},
+                       },
+               },
        })
 
        minetest.register_craft({
@@ -95,10 +132,69 @@ function stairs.register_slab(subname, recipeitem, groups, images, description,
                                return itemstack
                        end
                        
+                       -- Upside down slabs
+                       if p0.y-1 == p1.y then
+                               -- Turn into full block if pointing at a existing slab
+                               if n0.name == "stairs:slab_" .. subname.."upside_down" then
+                                       -- Remove the slab at the position of the slab
+                                       minetest.env:remove_node(p0)
+                                       -- Make a fake stack of a single item and try to place it
+                                       local fakestack = ItemStack(recipeitem)
+                                       pointed_thing.above = p0
+                                       fakestack = minetest.item_place(fakestack, placer, pointed_thing)
+                                       -- If the item was taken from the fake stack, decrement original
+                                       if not fakestack or fakestack:is_empty() then
+                                               itemstack:take_item(1)
+                                       -- Else put old node back
+                                       else
+                                               minetest.env:set_node(p0, n0)
+                                       end
+                                       return itemstack
+                               end
+                               
+                               -- Place upside down slab
+                               local fakestack = ItemStack("stairs:slab_" .. subname.."upside_down")
+                               local ret = minetest.item_place(fakestack, placer, pointed_thing)
+                               if ret:is_empty() then
+                                       itemstack:take_item()
+                                       return itemstack
+                               end
+                       end
+                       
+                       -- If pointing at the side of a upside down slab
+                       if n0.name == "stairs:slab_" .. subname.."upside_down" and
+                                       p0.y+1 ~= p1.y then
+                               -- Place upside down slab
+                               local fakestack = ItemStack("stairs:slab_" .. subname.."upside_down")
+                               local ret = minetest.item_place(fakestack, placer, pointed_thing)
+                               if ret:is_empty() then
+                                       itemstack:take_item()
+                                       return itemstack
+                               end
+                       end
+                       
                        -- Otherwise place regularly
                        return minetest.item_place(itemstack, placer, pointed_thing)
                end,
        })
+       
+       minetest.register_node("stairs:slab_" .. subname.."upside_down", {
+               drop = "stairs:slab_"..subname,
+               drawtype = "nodebox",
+               tiles = images,
+               paramtype = "light",
+               is_ground_content = true,
+               groups = groups,
+               sounds = sounds,
+               node_box = {
+                       type = "fixed",
+                       fixed = {-0.5, 0, -0.5, 0.5, 0.5, 0.5},
+               },
+               selection_box = {
+                       type = "fixed",
+                       fixed = {-0.5, 0, -0.5, 0.5, 0.5, 0.5},
+               },
+       })
 
        minetest.register_craft({
                output = 'stairs:slab_' .. subname .. ' 3',