WangLu's Notes

最近在试图把NetHack移植到网页上，名曰 BrowserHack 。目前功能上基本完成了，还剩下界面调整和修复bug。 NetHack我很早就有耳闻，简单尝试一下不太喜欢它的字符界面。其实我小时候很喜欢玩SuperZZT，现在也还行，不过比较来看SuperZZT还是象形，而NetHack的字符界面就是会意了，还是蛮需要想像力的。 NetHack自然也有各种图形界面移植。以前也是没有深入尝试过。这次移植正好也研究了一番，没想到很快就入迷了，令我之前玩过的RPG游戏顿时黯然失色。 这游戏有两个特点，其一是系统和操作非常复杂，各种奇怪的命令，让我不禁想起了文字冒险类游戏。不过配合地图和帮助，这不是问题。里面物体和各种交互也非常复杂，武器放水里会生锈，地面上各种暗门陷阱，怪物的AI，无不体现出设计者的用心。另一个特点是，按Wiki的说法是这个游戏最难在于初期，这在现代游戏里也是不多见，这可能让我一开始有点望而却步，但是熟悉了几本操作以后，每次重玩都能很快上手进入状态，开始刺激的冒险。专门有一片文章讲“为什么我死了又死还是死？”，按现代游戏的玩法，一上来就横冲直撞，很快就死了。如果考虑现实生活中的探险，每一步前进必定是小心翼翼。 反观现代游戏，显示技术不断提高，似乎大多数游戏都把精力放到显示效果去了。虽然显示技术能极大提高游戏吸引力，NetHack换了几个主题我也是非常兴奋，但是玩家不是傻子，游戏本质如果弱智还是没法玩。此外，现在游戏的难度与老游戏也是没有可比性。大多数游戏难度都是循序渐进的，各种教学关卡。当然这是改进了，可是很多游戏设置了各种弱智的成就，欺骗大脑的奖励系统，感觉是把玩家训练成傀儡。 NetHack也有各种不错的移植，比如Steam上的Vulture for NetHack。有如此强大的游戏核心，再辅以美观的画面和易用的操作，真是绝了！

There's a Debug Menu in many titles from the Metal Slug series. Today I played around with that debug menu in Metal Slug X, especially I turned on 'body rect' and 'attack rect', which revealed how the game works. Now not only did I have tons of hours of fun, I also studied a lot from this amazing game! Of course the following are only my observations, or my best guess on how they have been implemented the game. Although I think my interpretation should work, but it's definitely not the only way, and it's quite possible that the developers have achieved the same effect with another (maybe better) method. First Impression At the first glance, the debug drawing is far cleaner than I had expected, it seems that it's not tiled based physics at all. But note the thin shadowed area below the line, which may imply that it's still using tiled based calculation somehow. Edges The ground is described as line segments, from the way the ...

surface pro stylus calibration http://www.reddit.com/r/Surface/comments/18cd96/improved_pen_accuracy_with_a_100_point/ http://www.reddit.com/r/Surface/comments/1cy8hn/this_pen_calibration_is_so_far_the_best_solution/ Search for 'UserLinearityData' in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet and remove 'devicekind=pen'   merge tool: meld   linux虚拟机的硬盘大小不够，扩容以后又调整了分区，于是grub就不能进入了。启动说unknown filesystem然后进入grub rescue。 根据 http://askubuntu.com/questions/142300/fixing-grub-error-error-unknown-filesystem 在grub rescue输入 set prefix=(hd0,5)/boot/grub insmod linux linux (hd0,5)/boot/vmlinuz-3.11.0-15-generic initrd (hd0,5)/boot/initrd.img-3.11.0-15-generic boot 然后grub这步正常了，但是会卡到initramfs/busybox，说找不到init 于是在linux命令后面加上root=/dev/sda5就可以正常进入系统 进入系统以后赶紧用grub-install和update-initramfs再修正一下。

Emscripten is a C/C++ -> LLVM -> JavaScript compiler. It's useful and interesting, but one of its biggest limitations is about the sync/async model: JavaScript is single-threaded event-driven languages, therefore you cannot do a sleep() in the hope of receiving and processing extra events. Demo First of all, please enjoy this demo , on which I really spent some time. tl;dr Motivation: to make `sleep` and other similar functions actually work in our Runtime, without lots of labor work porting the C/C++ code I actually made it worked  `sync->async` is doable and I think it's not too hard - there are already implementations for JS I think this is a feature that cannot be supported by merely an external library Does it fit emscripten? Or is it possible to write a plugin for emscripten? Demo explained(?) The demo is basically a stop-time animation: //draw something //wait for some while //draw something else //wait... You can verify this ...

png优化工具：pngnq（有损）和 pngcrush（无损） ubuntu gnome 13.10的input source里找不到输入法：手动修改dconf键值 org.gnome.desktop.input-sources.sources ，在数组里添加 ('ibus','sunpinyin') 和 ('ibus', 'anthy') 。 但是mozc似乎不行，原因不明。观望。 mozc在dconf里要打('ibus', 'mozc-jp')

一般来说遇到标题所述问题我马上会想到smbfs，不过好久不用，最近发现smbfs已经没有了，取而代之的是cifs，于是命令大约是 sudo mount -t cifs //hostname//folder /localfolder -o user=username 不过总是报 Input/ouput error google了一阵，有的说加上 sec=ntlm 有的说加 iocharset=utf8 ，不过都没用。其中加了后者还会出 Can not access a needed shared library 的错误。根据 http://wiki.openwrt.org/doc/howto/cifs.client    和 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1067681 ， 安装了linux-image-extra-***的包以后才可以，但是mount还是不行。（我的linux是在虚拟器，装的最小内核linux-virtual） 于是尝试了一下smbclient，也是报错： tree connect failed: NT_STATUS_INSUFF_SERVER_RESOURCES 根据 http://klebom.net/melazy/tricks/ 查到是IRPStackSize过小的问题， 我在windows也确实查到了事件： Log Name: System Source: srv Date: 2013-10-20 14:08:29 Event ID: 2011 Task Category: None Level: Error Keywords: Classic User: N/A Computer: *** Description: The server's configuration parameter "irpstacksize" is too small for the server to use a local device. Please increase the value of this parameter. ...

I need to install Ubuntu 13.10 into an old Linux machine. The BIOS has been locked such that I cannot boot from CD or USB drives. The machine has grub 0.97 and a pretty old CentOS installed on it, which I've got the root access, so I decided to try to load the ubuntu iso file with it. Based on https://help.ubuntu.com/community/Installation/FromLinux I tried to enter the grub commands there, but then it failed with error like this: stdin: error 0 /init: line 7: can't open /dev/sr0: No medium found After spending hours in searching and trying, I found this url: http://askubuntu.com/questions/47076/usb-boot-problems which solved the problem for me. The full commands I used are: root (hd1,0) kernel /casper/vmlinuz.efi boot=casper live-media-path=/casper/ ignore_uuid initrd /casper/initrd.lz This link http://manpages.ubuntu.com/manpages/karmic/man7/casper.7.html describes the parameters for casper