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• Are books on programming hard to understand?

  - by DarkEnergy

  I've been reading books that are extremely daunting. Accelerated C++ is by far one of the books -- that I haven't finished. I plan too, but that's another story. When reading a programming book, do you find yourself re reading a lot of the paragraphs? Sometimes it takes me like an hour to read 20 pages out of a book. Sometimes they become so daunting that it takes me all day to finish a single chapter. I think having these as e-books makes them even harder to read sometimes, since I'm so used to looking down to read a book or just looking at tangible paper. IDK, just wanting to know if reading these books becomes extremely hard, and do you find yourself rereading the most simplest paragraphs 2-3 times just to get the meaning of it because the previous paragraph left your brain hurting? http://www.it-career-coach.net/2007/03/04/are-computer-programming-books-hard-to-study/ here is a article i read on something similar to this. edit sometimes I find myself reading a whole page... then I look up and say 'wth did I just read'... I could finish a chapter in 30 minutes to an hour and feel this way too...

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• Devoxx UK JCP & Adopt-a-JSR activities

  - by Heather VanCura

  Devoxx UK starts this week!  The JCP Program is organizing many activities throughout the conference, including some tables in the Hackergarten area on 12-13 June.  Topics include Java EE, Data Grids, Java SE 8 (Lambdas and Date & Time API), Money & Currency API and OpenJDK.  We will have two book signings by Richard Warburton and Peter Pilgrim during the Hackergarten - free signed copy of their books at these times - first come, first served (limited quantities available).  Thursday night is the party and the Birds of a Feather (BoF) sessions - come with your favorite questions and topics related to the JCP, Adopt-a-JSR and Adopt OpenJDK Programs!  See below for the schedule of activities; I will fill in details for each session tomorrow.    Thursday 12 June 10:20 - 12:50 Java EE -- Arun Gupta 13:30-17:00 Lambdas/Date & Time API --Richard Warburton & Raoul-Gabriel Urma (also a book signing with Richard Warburon during the afternoon break) 14:30-17:30 Data Grids - Peter Lawrey 14:30-18:00 Money & Currency -- Anatole Tresch 18:45 Adopt OpenJDK BoF session (Java EE BoF runs concurrently) 19:45 JCP & Adopt-a-JSR BoF session Friday 13 June 10:20-13:00 OpenJDK -- Mani Sarkar  10:20- 14:30 Money & Currency -- Anatole Tresch 10:20 - 13:00 Java EE -- Peter Pilgrim 13:00-13:30 Peter Pilgrim Java EE 7 Book signing sponsored by JCP @ lunch time 13:30 - 15:30 JCP.Next/JSR 364 -- Heather VanCura

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• xna download website source code

  - by Emre Canbazoglu

  I have to download the html code of a web site during the game. I am taking the poster url of a movie from the imdb web site by scrapping the html ( also other informations ). I have to do the download process many times during the game for different movies. I can download and scrap the html but downloading the html takes too much time and it causes the game to slow down(freeze while downloading). How can I solve this problem? My one approach is to download and scrap all the information and store them in a database before the game and during the game access this information from the database. I think this will work properly but that is not what I exactly want. It would be better if it is dynamic. I also thought of using multi-threading but I am a bit confused about how to implement threading in xna. I read some articles about it but it is not so clear. I mean when should I start the thread and what about the update function etc. I need your help guys

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• Efficient solution for multiplayer space partioning?

  - by DevilWithin

  This question is a little tricky, but I will try to make it clear, Lets say I am building an online game, not in a mmo scale, but gladly supporting as many players as possible, in a authoritative server approach, and I want really big worlds with lots of AI simulated enemies. I am aware of a few strategies to save server's CPU by subdividing the space and not processing what doesn't need processing. I 've already split the world by regions, that will require loading times and small transitions, which i think is important to mantain the quality of gameplay when playing locally (alone or even with a couple of friends) because the players won't normally be in more than one or two regions. But even a region can become pretty big, and have a lot of NPC simulating at a time, how do I handle this without screwing the player's experience? Approaches like one server per region and alike are not in the table. I am mainly looking for data structures to hold hordes of enemies, and even peaceful NPC. To finalize the question, please note that vehicles exist, therefore its considerably fast to travel within a region, influencing the "when" to cull areas. Sorry for the confusing question, thanks

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• Bridging The Gap Between Developers And Testers With VS 2010

  - by Vincent Grondin

  On January 29th Etienne Tremblay and I presented infront of roughly 120 people in Ottawa a 7 hours "sketch" on how VS 2010 and TFS 2010 can help both devs and testers in their respective work.  The presentation focused on how a testers' work can positively influence a developers' work and vice versa.  The format was quite unusual as I said it's a "sketch" where Etienne and I "ignore" the audience and we do as if we were at work and the audience is sort of "spying" on us.  In all I'm quite pleased with the content we presented and the format sure was alot of fun to render and I think the audience liked it too...  The good news for you people reading this post is that it got RECORDED and it's now available for download in quick 25 to 35 minutes format on the dev teach web site:  http://www.devteach.com/ALM-TFS2010-Bridgingthegap.aspx   There where 2 cameras, one filming us and one capturing the screen for our demos.  We switch from one to another in an intersting flow and Jean-René Roy made sure he kept all our goofs and didn't edit those funny "oups moments" where we screw-up in the scenario...  Mostly educative but hilarious at times !!! I encourage you all to download and watch the 13 episodes...  Follow a day at work for a tester and a developper using VS 2010 and TFS 2010 to improve their chemistry !  Thanks to Jean-René Roy for all the work he's put into this event and to Microsoft and Pyxis for sponsoring the event.

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• Cannot FTP without simultaneous SSH connection?

  - by Lucas

  I'm trying to set up an old box as a backup server (running 10.04.4 LTS). I intend to use 3rd party software on my PC to periodically connect to my server via FTP(S) and to mirror certain files. For some reason, all FTP connection attempts fail UNLESS I'm simultaneously connected via SSH. For example, if I use putty to test the connection to port 21, the system hangs and times out. I get: 220 Connected to LeServer USER lucas 331 Please specify the password. PASS [password] <cursor> However, when I'm simultaneously logged in (in another session) everything works: 220 Connected to LeServer USER lucas 331 Please specify the password. PASS [password] 230 Login successful. Basically, this means that my software will never be able to connect on its own, as intended. I know that the correct port is open because it works (sometimes) and nmap gives me: Starting Nmap 5.00 ( http://nmap.org ) at 2012-03-20 16:15 CDT Interesting ports on xx.xxx.xx.x: Not shown: 995 closed ports PORT STATE SERVICE 21/tcp open ftp 22/tcp open ssh 53/tcp open domain 139/tcp open netbios-ssn 445/tcp open microsoft-ds Nmap done: 1 IP address (1 host up) scanned in 0.15 seconds My only hypothesis is that this has something to do with iptables. Maybe it's allowing only established connections? I don't think that's how I set it up, but maybe? Here's my iptables rules for INPUT: lucas@rearden:~$ sudo iptables -L INPUT Chain INPUT (policy DROP) target prot opt source destination fail2ban-ssh tcp -- anywhere anywhere multiport dports ssh ufw-before-logging-input all -- anywhere anywhere ufw-before-input all -- anywhere anywhere ufw-after-input all -- anywhere anywhere ufw-after-logging-input all -- anywhere anywhere ufw-reject-input all -- anywhere anywhere ufw-track-input all -- anywhere anywhere ACCEPT tcp -- anywhere anywhere tcp dpt:ftp I'm using vsftpd. Any thoughts/resources on how I could fix this? L

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• Identity in .NET 4.5&ndash;Part 1: Status Quo (Beta 1)

  - by Your DisplayName here!

  .NET 4.5 is a big release for claims-based identity. WIF becomes part of the base class library and structural classes like Claim, ClaimsPrincipal and ClaimsIdentity even go straight into mscorlib. You will be able to access all WIF functionality now from prominent namespaces like ‘System.Security.Claims’ and ‘System.IdentityModel’ (yay!). But it is more than simply merging assemblies; in fact claims are now a first class citizen in the whole .NET Framework. All built-in identity classes, like FormsIdentity for ASP.NET and WindowsIdentity now derive from ClaimsIdentity. Likewise all built-in principal classes like GenericPrincipal and WindowsPrincipal derive from ClaimsPrincipal. In other words, the moment you compile your .NET application against 4.5,  you are claims-based. That’s a big (and excellent) change.   While the classes are designed in a way that you won’t “feel” a difference by default, having the power of claims under the hood (and by default) will change the way how to design security features with the new .NET framework. I am currently doing a number of proof of concepts and will write about that in the future. There are a number of nice “little” features, like FindAll(), FindFirst(), HasClaim() methods on both ClaimsIdentity and ClaimsPrincipal. This makes querying claims much more streamlined. I also had to smile when I saw ClaimsPrincipal.Current (have a look at the code yourself) ;) With all the goodness also comes a number of breaking changes. I will write about that, too. In addition Vittorio announced just today the beta availability of a new wizard/configuration tool that makes it easier to do common things like federating with an IdP or creating a test STS. Go get the Beta and the tools and start writing claims-enabled applications! Interesting times ahead!

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• Copy Formatting in Word

  - by Ahamad Patan

  Many a times you may need to copy the "Format" in Word. The "Copy Format" feature lets you quickly and easily "copy" all the formatting characteristics from one group of selected text to another. This is helpful when you have several headings that you want consistent formatting. Here are steps on how to Copy Formatting: 1. Select, or highlight, the item of text containing the format you wish to copy. 2. Office 2003 - Click on the Format Painter Button in the Standard Toolbar (looks like Paintbrush). Office 2007 - Format Painter Button is located on the Home tab (looks like a Paintbrush). Office 2003 - An I-beam with a small cross to the left will appear as you move your mouse. Office 2007 - An I-beam with a small paintbrush will appear as you move your mouse. 3. Select the text you wish to copy the formatting to. 4. Formatting of the selected text will automatically change. For multiple formatting changes, double-click on the Format Painter button in Step 2. Remember, you'll have to click it again to deselect it or press Esc.

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• What build tools do not depend on java (or Ruby)?

  - by Mohamed Meligy

  I'm wondering what generic build tools out there include their binary run-times and do not depend on another environment not shipped with them. For example, ANT requires Java, Rake requires Ruby, etc.. would be great if talking about also target-platform-agnostic tools, where I'd just give whatever command for building, whatever command for testing, etc.. and can then define my artifacts in CI or so. Would see something like that useful for building .NET projects (say, on both Windows .NET and Mono), and Node JS projects especially. I do not want to install Java and / or Ruby if what I want is a .NET build or a Node JS build. This is a bit of general awareness question not an exact problem I'm facing, that's why it's here not on StackOverflow. Update: To explain a bit more, what I'm after is the build script that would run MSBuild for compiling for example ( in .NET, and then maybe several Node/NPM commands in Node, etc..), and then have the rest build/test steps, instead of setting these all in MSBuild (again, in .NET case, also, wondering if there is equivalent story in Node).

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• How do I create a .deb file?

  - by JamesTheAwesomeDude

  Yes, I know that this question has been asked many times before, but none of the answers really helped. I'd like to package the Minecraft launcher (which has no proprietary code, AFAIK,) into a .deb file so that I can put it on a flash drive and share it with my friends. I have managed to install Minecraft it manually (put some files into /opt/minecraft, download an icon, and create a .desktop file in /usr/share/applications,) and I have made a shell script that completely automates the process, but it relies on wget to retrieve a few files, including the .desktop file. (It isn't a self-extracting archive, after all.) I'd like to be able to do this offline, as a lot of my friends have slow or no internet. (One of their internet lines was buried so shallowly that it actually got knocked out by the lawnmower.) I won't be loading it into a PPA or anything like that; I just want it to be a "formal" package that can be easily installed and uninstalled. (One thing that I would like is for sudo apt-get purge minecraft to also remove the .minecraft folder. It would also be nice to define the dependedcies as being able to accept OpenJDK or Sun's JVM.) Oh, just so you know, the Minecraft launcher is a .jar file, but I can very, very easily launch it via shell scripts. The exact command is right on the download page.

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• How to zero out a drive?

  - by Mohd Arafat Hossain

  I'm currently running Ubuntu 12.04 and want to completely format my laptop so I can install Windows 7 (replace Ubuntu). When I put in my bootable USB with the OS it just shows a black screen with a white blinking cursor on the top left corner. I wait for hours (to be specific 5 whole hours) waiting for something to happen but I get nothing, so I pull out the USB and my Ubuntu 12.04 loads up. Repeated this several times with putting different boot priority options on top-est that relate to USB but the results are same. I go and visit some sites on the net like this http://www.techspot.com/community/topics/cant-replace-ubuntu-with-windows.175716/ that say I have to zero out my hard drive. My question is how? Note: Erasing out all my data is no problem cause I have nothing important to backup. If I have to lose my primary OS (Ubuntu 12.04) in the process I am ready to as my aim is just to install Windows 7 successfully. Please don't answer that there is something wrong with my USB or my USB reader/port/hardware or the content inside the USB cause they all works fine on my brothers PC as it boots up flawlessly.

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• London Hotel Gives iPad For Guest During Their Stay

  - by Gopinath

  The Brits are still waiting for the launch of iPad but a luxurious hotel, The Berkeley, located in London is offering its guest an iPad during their stay in the luxurious suites. The iPads are pre-loaded with a range of customized apps designed by the hotel for enriching the London experience of their guests.  The hotel explains From Le Monde to the Wall Street Journal, your local newspaper will be available at breakfast and quickly checking the opening times of Christian Louboutin on Motcomb Street has never been more convenient. A wide range of games, videos and comic books is available for children and our experienced Concierge team has created their personal Top 5 of must-visit places – shops, exhibitions, local attractions and some hidden gems – which are clearly mapped so that you can plan your itinerary. The Berkeley hotel is enjoying the free publicity it’s getting across the globe as they are the first one to introduce iPads in London hotels. And the Apple too, for being a symbol of luxurious gadgets. By the did I tell you that each night stay at the luxurious suites of the hotel costs around $2804? This money seems to be far more than the required  to travel to US, grab an iPad and return back home. Join us on Facebook to read all our stories right inside your Facebook news feed.

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• MS Bing web crawler out of control causing our site to go down

  - by akaDanPaul

  Here is a weird one that I am not sure what to do. Today our companies e-commerce site went down. I tailed the production log and saw that we were receiving a ton of request from this range of IP's 157.55.98.0/157.55.100.0. I googled around and come to find out that it is a MSN Web Crawler. So essentially MS web crawler overloaded our site causing it not to respond. Even though in our robots.txt file we have the following; Crawl-delay: 10 So what I did was just banned the IP range in iptables. But what I am not sure to do from here is how to follow up. I can't find anywhere to contact Bing about this issue, I don't want to keep those IPs blocked because I am sure eventually we will get de-indexed from Bing. And it doesn't really seem like this has happened to anyone else before. Any Suggestions? Update, My Server / Web Stats Our web server is using Nginx, Rails 3, and 5 Unicorn workers. We have 4gb of memory and 2 virtual cores. We have been running this setup for over 9 months now and never had an issue, 95% of the time our system is under very little load. On average we receive 800,000 page views a month and this never comes close to bringing / slowing down our web server. Taking a look at the logs we were receiving anywhere from 5 up to 40 request / second from this IP range. In all my years of web development I have never seen a crawler hit a website so many times. Is this new with Bing?

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• Which tools you use for development in your company?…Please be exact [closed]

  - by predrag.music

  If you are a professional php/(my/postgre/?)sql/? developer and working in a professional team ... I would like to know which tools you use for development in your company. I do not care which tool is better or worse, but "which tools you use", if it is not a TOP SECRET :) For example, these are just some of the tools i/we use (first those used most (in general)): Pen, paper lots of cofee, cola ... let me think ... mmmm ... yeah more cofee :) All kinds of books (a lots of books) OS: Win / MacOS X Server: Hosted (CentOS )/ At work Mac OS X Dev server: XAMPP / MAMP / LAMP Editor: Notepad++ IDE: Netbeans / Zend Studio / Eclipse Version Control System: Mercurial / SVN FTP: Filezilla mostly / ... Passwords: KeePass js / ajax: jQuery / pure js / jQuery UI Framework:CI / Zend / pure php Database: MySQL / Other ORM: Framework layer db (Not an ORM I know but...) / Doctrine (2) / no ORM Debugging: Xdebug (PHP) / firebug (ajax/js/html/css/...) / framework profiler (stuff) / ... (x) Dreaming: About... Thinking: Not about chaos in ? direction .... n Anything else that comes to mind n+1 Zilion other stuff i know but i can't remember ... 8 some other stuff i (don't) remember i forgot, give up, delete, lost, said to myself never again, i haven't had time stuff, have on computer stuff but can't find or don't even know i have it on my computer at least 2-3 or more times, stuff I said to myself i'll check later and never checked again for all sort of "perfectly justified" reasons (time, memory, wife :), whatever,...), ... what is the reason i'm asking this?:) 8 and beyond looking forward to see a lot of answers ?

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• Alternatives to Professional Version Control

  - by greengit

  We're teaming up with some non programmers (writers) who need to contribute to one of our projects. Now they just don't like the idea of using Git (or anything for that matter) for version controlling their work. I think this is because they just don't find it worthwhile to wrap their heads around the twisted concepts of version control. (when I first introduced them to branching and merging -- they looked like I was offending them.) Now, we're not in a position to educate them or convince them to use it. We're just trying to find alternatives so that we get all their work versioned (which is what we need) -- and they get easy workflow and concentrate on what they do. I have come up with some ideas... tell them to save their work as a separate file every time they make some non-trivial change, and then use a diff on our side to just track changes. write a program (in Python) that implements the "milestones" in CSSEdit in some way. About the project: It is a natural language processing system (written in C + Python). We've hired some writers to prepare inputs for the system in different languages. And as we evolve the software, we'd need those writers to make changes to their inputs (articles). Sometimes the changes are very small (a word or two), and other times big. The reason we need to version control those changes is because every small/big change in the input has the potential to change the system's output dramatically.

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• Tyrus 1.3

  - by Pavel Bucek

  I’m pleased to announce that new version of Tyrus was released today. It contains some interesting features, like asynchronous handling of connectToServer method call, optimised broadcast support and lots of stability and performance improvements. As previously – I will follow with more blog posts about selected features later. Some of them are already described in updated User guide. Complete list of bugfixes and new featuresTYRUS-262: @OnOpen fails for programmatically deployed annotated endpoint.TYRUS-261: Text decoder disables Binary decoder if both are configured for the same server endpoint; endpoint cannot receive binary messages anymore.TYRUS-248: Consolidate Extension representationTYRUS-258: Tyrus always creates HTTP sessionTYRUS-251: DecodeException is not passed to @OnError methodTYRUS-252: encoder for primitive types cannot be overridden.TYRUS-250: Sec-WebSocket-Protocol header cannot be present when there is no negotiated subprotocolTYRUS-249: WebSocketContainer MaxSessionIdleTimeout is not propagated to Session (server side)TYRUS-257: Async timeout value set on WebSocketContainer is not propagated to RemoteEndpoints (Session#getAsyncRemote())TYRUS-253: DecodeException is not passed to @OnError method from session.getAsyncRemote().sendObjectTYRUS-243: WebSocketContainer.connectToServer can block for secondsTYRUS-227: Build failure : AsyncBinaryTestTYRUS-226: Tyrus build error : OnCloseTestTYRUS-247: Make all samples use TestContainer for testsTYRUS-238: Refactor WebSocketEngine (SPI and Impl)TYRUS-157: Submitting tasks to an injected ManagedExecutorService in a ServerEndpoint does not workTYRUS-137: Improve subprotocols/extensions headers parsingTYRUS-133: Some Broadcast(er) API is needed in order to opmtimize chat-like usecasesTYRUS-245: ServerEndpointConfig#getConfiigurator returns Configurator not used when getNegotiatedExtensions has been called.TYRUS-240: clean up duplicated static fields (strings)TYRUS-230: When Session is invalidated, the close reason is not 1006TYRUS-190: Remove TyrusServetServerContainer (merge with TyrusServerContainer)TYRUS-65: Implement common utilities for testingTYRUS-242: Tyrus does not run on JDK8 compact2 profileTYRUS-237: RemoteEndpoint.Async#sendBinary does not throw IllegalArgumentException when data is nullTYRUS-239: Improve WebSocketEngine ByteBuffer handlingTYRUS-232: Refactor grizzly/servlet container – Tyrus-SPITYRUS-235: Fix findbugs errors in tests/servletTYRUS-234: Remove support for older protocol versionTYRUS-229: Session#setMaxIdleTimeout() will kill the session whether or not the session actually timed outTYRUS-225: Invalidation of (Servlet) HttpSession does not invalidate WebSocket SessionTYRUS-153: Static map in TyrusRemotEndpointTYRUS-201: Wrong ServletInputStream#isReady() usage in TyrusHttpUpgradeHandlerTYRUS-224: Refactor Connection#write and ConnectionImpl to use CompletionHandler only (no Future)TYRUS-221: wss:// doesn’t appear to function correctly via a http proxy.TYRUS-146: Support request from client to secured services (“wss”)TYRUS-223: Message can be writen multiple times when running on Servlet container TYRUS-71: ErroCollector not properly used in AnnotatedEndpoint class. Tyrus 1.3 will be integrated in Glassfish trunk soon – you can download nightly build or upgrade to newer Tyrus manually (replace all Tyrus jars).

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• SharePoint 2007 Parser Error after updating master page

  - by Kelly Jones

  A few weeks ago I was updating the master page for a SharePoint 2007 (WSS) site.  The client wanted the site updated to reflect the new look and feel that is being applied to another set of sites in the organization. I created a new theme and master page, which I already wrote about here and here.  It worked well, except for a few pages on a subsite.  On those pages, I got the following error: Server Error in '/' Application. Parser Error Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. Parser Error Message: Code blocks are not allowed in this file.   I decided to go comb through my new master page and compare it to the existing master page that was already working.  After going through them line by line several times, I had no clue what would be causing the error because they were basically the same! It turns out, it was a combination of two things.  First, on a few of the pages in the site, there was some include code (basically an <% EVAL()%> snippet).  This was the code that was triggering my error “Code blocks are not allowed in this file”. However, this code was working fine with the previous master page. I decided to then try doing a full deployment of the site with the new master page, and it worked fine!  Apparently, if the master page is deployed using a Feature, then it is granted permission to allow code blocks, but if you upload pages either using web UI or SharePoint Designer, then the pages won’t be able to use code blocks. I haven’t been able to pin down the rules or official info about this, but I thought others might find it useful anyway.

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• How to remove trailing slashes from URL with .htaccess?

  - by Matt

  The situation Across the entire domain, we'd like the URLs to hide file extensions and remove trailing slashes, independent of the domain name itself (as in, works on any domain). Sample of our directory structure We're not using index.* files except for the homepage. / /index.php /account.php /account /subscriptions.php /login.php /login /reset-password.php The goal Some examples of how these files might be requested, and how they should look in the browser: / and index.php -- mydomain.com (literally just the bare domain name). /account.php or /account/ or /account -- mydomain.com/account /account/subscriptions.php or /account/subscriptions/ or /account/subscriptions -- mydomain.com/account/subscriptions As you can see, there are several ways to access each webpage, but no matter which of the 2 or 3 ways you use to get there, it only shows the one preferred URL in the browser. The question How is this done with .htaccess using mod_rewrite? I've banged my head against the wall trying to figure this out, but in general, the rewrite flow would seem to be something like this: External 301 redirect ( mydomain.com/account/ -- mydomain.com/account ) Internally append .php ( mydomain.com/account -- mydomain.com/account.php ) I've been Googling this all day, read thousands of lines of documentation and config texts, and have tried several dozen times... I think more brains on this would help a lot. UPDATE We found an answer our question (see below).

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• High number of ethernet errors. Tool for testing the ethernet card?

  - by Fabio Dalla Libera

  I have an Asus Sabertooth X79. I often get corrupted files. I checked the RAM, but memtest finds no errors. To avoid the possibility of disk errors, I tried copying the files to tmpfs. If I copy from the network, I get md5sum mismatches about once every 10 times using a 6Gb file. Copying from RAM to RAM, I didn't get mismatches. I get a very high number of errors in ifconfig (compared to others PCs I just took as reference, which have 0 with much more traffic). Here is an example RX packets:13972848 errors:200 dropped:0 overruns:0 frame:101 The motherboard is new, but do you think there're some problems with it? What could I use to test the (integrated) network adapter? What else do you think I should double check? --edit-- I tried another NIC, it gives a lot of Corrupted MAC on Input. Disconnecting: Packet corrupt lost connection. I noticed that another PC downloads at 11.1MB/s without problems. This pc at 66.0 MB/s. Is there any way to try to limit the speed?

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• How to improve batching performance

  - by user4241

  Hello, I am developing a sprite based 2D game for mobile platform(s) and I'm using OpenGL (well, actually Irrlicht) to render graphics. First I implemented sprite rendering in a simple way: every game object is rendered as a quad with its own GPU draw call, meaning that if I had 200 game objects, I made 200 draw calls per frame. Of course this was a bad choice and my game was completely CPU bound because there is a little CPU overhead assosiacted in every GPU draw call. GPU stayed idle most of the time. Now, I thought I could improve performance by collecting objects into large batches and rendering these batches with only a few draw calls. I implemented batching (so that every game object sharing the same texture is rendered in same batch) and thought that my problems are gone... only to find out that my frame rate was even lower than before. Why? Well, I have 200 (or more) game objects, and they are updated 60 times per second. Every frame I have to recalculate new position (translation and rotation) for vertices in CPU (GPU on mobile platforms does not support instancing so I can't do it there), and doing this calculation 48000 per second (200*60*4 since every sprite has 4 vertices) simply seems to be too slow. What I could do to improve performance? All game objects are moving/rotating (almost) every frame so I really have to recalculate vertex positions. Only optimization that I could think of is a look-up table for rotations so that I wouldn't have to calculate them. Would point sprites help? Any nasty hacks? Anything else? Thanks.

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• How to work around a possible XNA Game Studio or Windows Phone SDK install failure on Windows 8

  - by Laurent Bugnion

  I am not sure if you guys know Aaron Stebner. Aaron works at Microsoft, and has pulled thorns from my side many many times already. His blog is at http://blogs.msdn.com/b/astebner and it is a gold mine of tips and tricks to debug and solve many cryptic issues happening during installation and removal of programs. For example, Aaron taught me how to remove programs that do not appear in the Programs and Features list, amongst many other things. The last nugget I used from Aaron’s blog saved my butt just before a presentation where I had to run both Visual Studio 10 with the Windows Phone SDK, and Visual Studio 11 for WinRT development. Of course this had to be on Windows 8. Unfortunately when you install the Windows Phone SDK on Windows 8, you may (or may not, I saw both scenarios) encounter an issue with XNA, and the installation fails. Unfortunately, even if you don’t use XNA in your apps, this will prevent even normal Windows Phone app development. Fortunately, Aaron has a fix for that. I hope that this helps spread the word, and increase Aaron’s blog’s visibility! Happy coding, Laurent   Laurent Bugnion (GalaSoft) Subscribe | Twitter | Facebook | Flickr | LinkedIn

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• Which Browser is the Best to Use When Running Your Laptop on Battery Power?

  - by Asian Angel

  Squeezing the maximum amount of usage time out of your laptop battery can be challenging at times…it all depends on the software you are using. One software we are all likely to be using is a browser to keep up with our online lives… If your laptop is older, then getting the most out of your laptop’s aging battery is definitely a must. The good folks over at the 7 Tutorials blog have done a comparison test to see which browser is the gentlest on your laptop’s battery and the results may surprise you. You can view the results by visiting the link below… Had better (or worse) luck with one of the browsers tested? Then make sure to share the results with your fellow readers in the comments! Test Comparison: Which Browser Will Make Your Laptop’s Battery Last Longer? [7 Tutorials] How to Own Your Own Website (Even If You Can’t Build One) Pt 3 How to Sync Your Media Across Your Entire House with XBMC How to Own Your Own Website (Even If You Can’t Build One) Pt 2

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• What is the value in hiding the details through abstractions? Isn't there value in transparency?

  - by user606723

  Background I am not a big fan of abstraction. I will admit that one can benefit from adaptability, portability and re-usability of interfaces etc. There is real benefit there, and I don't wish to question that, so let's ignore it. There is the other major "benefit" of abstraction, which is to hide implementation logic and details from users of this abstraction. The argument is that you don't need to know the details, and that one should concentrate on their own logic at this point. Makes sense in theory. However, whenever I've been maintaining large enterprise applications, I always need to know more details. It becomes a huge hassle digging deeper and deeper into the abstraction at every turn just to find out exactly what something does; i.e. having to do "open declaration" about 12 times before finding the stored procedure used. This 'hide the details' mentality seems to just get in the way. I'm always wishing for more transparent interfaces and less abstraction. I can read high level source code and know what it does, but I'll never know how it does it, when how it does it, is what I really need to know. What's going on here? Has every system I've ever worked on just been badly designed (from this perspective at least)? My philosophy When I develop software, I feel like I try to follow a philosophy I feel is closely related to the ArchLinux philosophy: Arch Linux retains the inherent complexities of a GNU/Linux system, while keeping them well organized and transparent. Arch Linux developers and users believe that trying to hide the complexities of a system actually results in an even more complex system, and is therefore to be avoided. And therefore, I never try to hide complexity of my software behind abstraction layers. I try to abuse abstraction, not become a slave to it. Question at heart Is there real value in hiding the details? Aren't we sacrificing transparency? Isn't this transparency valuable?

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• Libgdx Box2d createfixture crashes vm intermittently

  - by user45021

  I have a hard to debug problem. I have a Box2D game which creates a wheeled vehicle. I want the vehicle body to reflect when it goes from moving left to moving right. to do this i set a flag in a changelistener on a button and then in update method i destroy and recreate the body facing the other way. it works fine most of the time but if i flip the vehicle several times quickly JVM crashes. no errors nothing in log. i added system.out.prints and the errors occur in the routine that instantiates the new body and before anything gets deleted/removed so i don't think the UI is trying to access null pointers. and if it was it should throw an error. M the crash seems to be at createFixture statements. but the work most of the first time. I tried debugging but the error doesn't happen much when the flips are slow. in any case createFixture drops fairly quickly into jni. Is this a Box2D bug? Is GC the issue? From Mission Control I see the GC is collecting on a period of ooh maybe 5s and flipping slower than that mostly works. how do i debug this? i am win7 64bit with 64bit at and jdk7 64bit. libgdx-0.9.9 and sometimes libgdx-nightly-20140215.

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• Installed on a machine with EFI and after installation, it says the disk is not bootable

  - by Roy Hocknull

  I installed Ubuntu 11.10 and the installation runs through fine. It then says reboot, and the machine says 'inserts a boot disk' which means the hard disk isn't bootable. The primary hard disk is an EFI device, and nothing seems to work. The machine in question is an Acer Aspire M3970 desktop. Core i5 2300, with 8Gb Ram. Main boot drive is an SSD (Vertex 2E 60Gb). I am trying to install the 11.10 x64 version. The installation I have tried from CD and USB stick. It goes through the install, allows you to partition the drives then installs all the packages. At the end it goes for a reboot, and asks you to remove the installation media. The PC then restarts and says no bootable disk. I tried it many times. In the end I have installed Fedora 15 x64 which works straight away with no messing. Unless this issues is fixed I have to drop 11.10 as a viable option. From my experience F15 isn't quite as polished as Ubuntu, but in this case - it works!! Is this a widespread problem or am I unique?

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