add texture tool

tools/texture

@@ -0,0 +1,25 @@
+#!/usr/bin/env ruby
+
+require 'tmpdir'
+require 'rmagick'
+
+for f in $ARGV
+	out_name = File.realdirpath(f + ".texture")
+	im = Magick::Image.read(f).first
+	im.format = "TGA"
+	Dir.mktmpdir do |dir|
+		Dir.chdir(dir) do
+			mip_num = 0
+			loop do
+				im.write "#{dir}/#{mip_num}"
+				mip_num += 1
+				im = im.minify
+				break if im.columns < 2 or im.rows < 2
+			end
+			files = Dir.children dir
+			system "tar", "--format=ustar", "-Ipigz", "-cf", out_name, *files
+		end
+	end
+end
+
+## EOF