fix scanning programs for uniform names

runtime/lib/gl.rb

@@ -20,7 +20,7 @@ module GL
         f_shader or raise "Could not find shader #{f_src_fname}"
 
         uniforms = (v_src + f_src).lines.map do |line|
-          if line =~ /\buniform\s.*\s(\S+);/
+          if line =~ /^\s*uniform\s.*\s(\S+);/
             $1
           end
         end.compact