add a few new shapes to the table saw: (#67)

* 1/16 slab, L-shaped (two sides)
* 1/16 slab, corner-shaped (three sides)
* 1/16 slab, U-shaped (three sides)

circular_saw.lua

@@ -26,9 +26,9 @@ circular_saw.cost_in_microblocks = {
 	1, 1, 1, 1, 1, 1, 1, 2,
 	2, 3, 2, 4, 2, 4, 5, 6,
 	7, 1, 1, 2, 4, 6, 7, 8,
-	3, 1, 1, 2, 4, 4, 2, 6,
+	1, 2, 2, 3, 1, 1, 2, 4,
-	7, 3, 7, 7, 4, 8, 3, 2,
+	4, 2, 6, 7, 3, 7, 7, 4,
-	6, 2, 1, 3, 4,
+	8, 3, 2, 6, 2, 1, 3, 4
 }
 
 circular_saw.names = {
@@ -40,6 +40,7 @@ circular_saw.names = {
 	{"panel", "_4"},
 	{"micro", ""},
 	{"panel", ""},
+
 	{"micro", "_12"},
 	{"panel", "_12"},
 	{"micro", "_14"},
@@ -48,6 +49,7 @@ circular_saw.names = {
 	{"panel", "_15"},
 	{"stair", "_outer"},
 	{"stair", ""},
+
 	{"stair", "_inner"},
 	{"slab", "_1"},
 	{"slab", "_2"},
@@ -56,11 +58,16 @@ circular_saw.names = {
 	{"slab", "_three_quarter"},
 	{"slab", "_14"},
 	{"slab", "_15"},
+
+	{"slab", "_two_sides"},
+	{"slab", "_three_sides"},
+	{"slab", "_three_sides_u"},
 	{"stair", "_half"},
 	{"stair", "_alt_1"},
 	{"stair", "_alt_2"},
 	{"stair", "_alt_4"},
 	{"stair", "_alt"},
+
 	{"slope", ""},
 	{"slope", "_half"},
 	{"slope", "_half_raised"},
@@ -69,6 +76,7 @@ circular_saw.names = {
 	{"slope", "_inner_half_raised"},
 	{"slope", "_inner_cut"},
 	{"slope", "_inner_cut_half"},
+
 	{"slope", "_inner_cut_half_raised"},
 	{"slope", "_outer"},
 	{"slope", "_outer_half"},

stairsplus/slabs.lua

@@ -28,6 +28,20 @@ local slabs_defs = {
 	["_2"] = 2,
 	["_14"] = 14,
 	["_15"] = 15,
+	["_two_sides"] = {
+						{ -0.5, -0.5, -0.5, 0.5, -7/16, 7/16 },
+						{ -0.5, -0.5, 7/16, 0.5, 0.5, 0.5 }
+					},
+	["_three_sides"] = {
+						{ -7/16, -0.5, -0.5, 0.5, -7/16, 7/16 },
+						{ -7/16, -0.5, 7/16, 0.5, 0.5, 0.5 },
+						{ -0.5, -0.5, -0.5, -7/16, 0.5, 0.5 }
+					},
+	["_three_sides_u"] = {
+						{ -0.5, -0.5, -0.5, 0.5, 0.5, -7/16 },
+						{ -0.5, -0.5, -7/16, 0.5, -7/16, 7/16 },
+						{ -0.5, -0.5, 7/16, 0.5, 0.5, 0.5 }
+					}
 }
 
 function stairsplus:register_slab_alias(modname_old, subname_old, modname_new, subname_new)
@@ -47,21 +61,36 @@ end
 function stairsplus:register_slab(modname, subname, recipeitem, fields)
 	local defs = stairsplus.copytable(slabs_defs)
 	local desc_base = S("%s Slab"):format(fields.description)
-	for alternate, num in pairs(defs) do
+	for alternate, shape in pairs(defs) do
-		local def = {
+
-			node_box = {
+		local def = {}
-				type = "fixed",
+
-				fixed = {-0.5, -0.5, -0.5, 0.5, (num/16)-0.5, 0.5},
+		if type(shape) ~= "table" then
+			def = {
+					node_box = {
+						type = "fixed",
+						fixed = {-0.5, -0.5, -0.5, 0.5, (shape/16)-0.5, 0.5},
+					},
+					description = ("%s (%d/16)"):format(desc_base, shape)
+				}
+		else
+			def = {
+				node_box = {
+					type = "fixed",
+					fixed = shape,
+				},
+				description = desc_base
 			}
-		}
+		end
+
 		for k, v in pairs(fields) do
 			def[k] = v
 		end
+
 		def.drawtype = "nodebox"
 		def.paramtype = "light"
 		def.paramtype2 = def.paramtype2 or "facedir"
 		def.on_place = minetest.rotate_node
-		def.description = ("%s (%d/16)"):format(desc_base, num)
 		def.groups = stairsplus:prepare_groups(fields.groups)
 		if fields.drop and not (type(fields.drop) == "table") then
 			def.drop = modname.. ":slab_" .. fields.drop .. alternate