1 files changed, 95 insertions, 0 deletions
diff --git a/randtilegen.rb b/randtilegen.rb
new file mode 100644
index 0000000..f77d333
--- /dev/null
+++ b/randtilegen.rb
@@ -0,0 +1,95 @@
+class RandTileGenerator
+	def initialize
+		@sections = {}
+	end
+
+	def section(name)
+		@sections[name] ||= {entries: []}
+		@current_section = @sections[name]
+
+		yield
+	end
+
+	def random(range, type=:both, numbers=nil)
+		numbers = range if numbers.nil?
+
+		@current_section[:entries] << {range: range, type: type, numbers: numbers.to_a}
+	end
+
+	def pack
+		# first, work out an offset for every section and entry
+		# also, collect the data for each individual entry into an Array
+		current_offset = 8 + (@sections.count * 4)
+		all_entry_data = []
+
+		@sections.each_pair do |name, section|
+			section[:offset] = current_offset
+			current_offset += 8
+
+			section[:entries].each do |entry|
+				entry[:offset] = current_offset
+				all_entry_data << entry[:numbers]
+				current_offset += 8
+			end
+		end
+
+		# assign an offset to each piece of entry data
+		data_offsets = {}
+		all_entry_data.uniq!
+
+		all_entry_data.each do |data|
+			data_offsets[data] = current_offset
+			current_offset += data.size
+		end
+
+		# assign an offset to each section name
+		name_offsets = {}
+		@sections.keys.each do |name|
+			name_offsets[name] = current_offset
+			current_offset += name.size + 1
+		end
+
+		# now pack it all together
+		header = ['NwRT', @sections.count].pack('a4 N')
+		offsets = @sections.each_value.map{|s| s[:offset]}.pack('N*')
+
+		section_data = @sections.each_pair.map do |name, section|
+			name_offset = name_offsets[name] - section[:offset]
+			entry_count = section[:entries].count
+
+			entry_data = section[:entries].map do |entry|
+				lower_bound = entry[:range].min
+				upper_bound = entry[:range].max
+
+				count = entry[:numbers].count
+				type = [:none, :horz, :vert, :both].index(entry[:type])
+
+				num_offset = data_offsets[entry[:numbers]] - entry[:offset]
+
+				[lower_bound, upper_bound, count, type, num_offset].pack('CCCC N')
+			end
+
+			[name_offset, entry_count].pack('NN') + entry_data.join
+		end
+
+		output = [header, offsets]
+		output += section_data
+		output += all_entry_data.map{|data| data.pack('C*')}
+		output << @sections.keys.join("\0")
+		output << "\0"
+		output.join
+	end
+end
+
+
+g = RandTileGenerator.new
+g.section('TestTileset') do
+	g.random(1..20)
+	g.random(21..24, :none)
+	g.random(250..255, :vert, 0..5)
+end
+
+File.open('/home/me/Games/Newer/DolphinPatch/NewerRes/RandTiles.bin', 'wb') do |f|
+	f.write g.pack
+end
+