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• Using a texture as an integer array (OpenGL 3.3, shader version 3.3)

  - by Cubic

  I'm trying to have something like an integer array uniform for my fragment shader (I only need read access). Since it's a fairly large chunk of data (not so large that uploading it in every frame would be impossible, but enough to make me want to rather not do it). Essentially I want to just pass it a uniform telling the shader where this "array" is. I believe I can use a 1D texture for this, but I don't know how (actually, I don't know how to do many things because I just can't seem to find a reference for GLSL 3.3, I only ever find references for the C API). This sounds like a rather basic question and I'm sure it's been answered already somewhere, but I keep searching and can't quite find what I'm looking for.

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• iptables rule problem

  - by thakrage

  I've been searching around for some time now, but nothing solves my problem. I'm setting up a mail server, but when writing to the iptables, I get an error: iptables-restore: line 2 failed. I'm tryig to use the following /etc/iptables.test.rules: # Allows SMTP access -A INPUT -p tcp --dport 25 -j ACCEPT # Allows pop and pops connections -A INPUT -p tcp --dport 110 -j ACCEPT -A INPUT -p tcp --dport 995 -j ACCEPT # Allows imap and imaps connections -A INPUT -p tcp --dport 143 -j ACCEPT -A INPUT -p tcp --dport 993 -j ACCEPT After this, I'm issuing the following command: sudo iptables-restore < /etc/iptables.test.rules However I get returned this: iptables-restore: line 2 failed. I don't know what the problem is. Can anyone clarify? btw. I'm using Ubuntu 10.10 LTS

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• Pitfalls of using a WYSIWYG editor? [closed]

  - by user50849

  I'm interested in reasons for disallowing content editors on medium to large sites, from using various forms of WYSIWYG editors. A common problematic scenario I can think of is that with the use of a WYSIWYG, an editor uploads an image "somewhere" to the file-system, inserts it directly into the text, and publishes the article. Shortly afterwards, someone wants to pull out "The last 10 uploaded images", and display them on the frontpage. Good luck parsing all the content. Taking a look around at some large international online magazines, such as http://www.time.com/, and some local ones, I see that the editors seem to produce articles that are almost only consisting of raw text. Images are usually at the top of the article, and otherwise the most complex content are usually links. What are some common reasons for refusing editors access to WYSIWYG tools?

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• Deleting a game object

  - by Balls

  I tried doing this but it cause an access violation. void GameObjectFactory::Update() { for( std::list<GameObject*>::iterator it=gameObjectList.begin() ..... (*it)->Update(); } void Bomb::Update() { if( time == 2.0f ) { gameObjectFactory->Remove( this ); } } void GameObjectFactory::Remove( ... ) { gameObjectList.remove( ... ); } My thoughts would be to mark the object to be dead then let the factory handle it the on next frame for deletion. Is it the best and fastest way? What do you think?

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• NetworkManager refuses to manage my WLAN interface

  - by user104167

  I'm using Ubuntu 12.10 with Gnome 3.6 on a brand-new Samsung NP900X4C. The installer detected the wireless adapter, took in the SSID and WPA passphrase, wrote these into /etc/network/interfaces and connected perfectly. Once installation was finished I wanted to switch to using NetworkManager to manage the wireless adapter, since this is much more convenient than fiddling with /etc/network/interfaces every time I find a new hotspot. Therefore I edited /etc/NetworkManager/NetworkManager.conf to set: [ifupdown] managed=true When I rebooted NetworkManager, the problems started: - The NetworkManager tray applet changed from saying device not managed to device not ready - I lost all internet connectivity as wlan0 would not associate to the Access Point - if I set managed=false in NetworkManager.conf and restarted both NetworkManager and networking services from the command-line, the Gnome desktop "semi-crashed" and lost all its Window Decorations, the panel, the launcher and basically became unusable. However if I restart the computer completely after setting managed=false, wlan0 once again works perfectly.

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• I cannot login to my ubuntu admin!!!! HELP!

  - by Spinz01

  I used lightdm to hide the users at the login prompt of ubuntu and it hid my account. The only one visible is "other" and it doesn't even have a known password. So, I have accessed the terminal and created a guest account and another account without passwords and they are not visible. I am new to using the terminal so I don't know how to write the commands for either: making all users/accounts visible to the login and/or making the guest accounts visible, and then once in the GUI change the login settings to see my admin account. I have no idea of what else I could do, or even how to do it. I would appreciate any help, I'm in a desperate situation because I really need to access my desktop! THANK YOU!!! Any ideas are appreciated!!!

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• How should dependencies be managed across a modular application?

  - by bear

  Let's say that we have a structure like this: Application -- Modules --Module1 -- Controller -- PublicHelper --Module2 -- Controller -- PublicHelper Whereby a module's Public Helper can provide helper functions. In nearly every module helper, the helper needs to access another module's public helper methods. Let's say for instance, in a PHP application: Module1 provides functionality to create a sale, and as part of the class Module1PublicHelper extends AbstractModuleHelper { public function createSale($customerId, $param, $param) { $userPublicHelper = // grab an instance of the user public helper $currentUser = $userPublicHelper->getCurrentUser(); } } class Module2PublicHelper extends AbstractModuleHelper { public function getCurrentUser() { //do something return $user; } } In this situation, the method needs to obtain an instance, either new or whatever of the user public helper. Given that all of Module Public Helper classes are instantiated with a minimum set of constructor params, e.g. EntityManager, what would be the best way to get a copy of it? Obviously, we can't really inject the user public helper class into the class containing createSale One solution would be to use a service locator or registry, however, testing the application isn't exactly easy.

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• why opening a port is so difficult in ubuntu?

  - by icn

  I have searched around and I have run these commands iptables -A INPUT -p tcp -d 0/0 -s 0/0 --dport 5432 -j ACCEPT iptables-save > /etc/iptables.rules And I rebooted the box. I had no luck. What am I missing? IS there a universal way to do this thing in ubuntu? I remember in fedora I just need to edit a text file and make it happen. Thanks UPDATE I have run ufw allow 5432 and I ran ufw status I got this result Status: active To Action From -- ------ ---- 5432/tcp ALLOW Anywhere 80 ALLOW Anywhere 22 ALLOW Anywhere 5432 ALLOW Anywhere 5432/tcp ALLOW Anywhere (v6) 80 ALLOW Anywhere (v6) 22 ALLOW Anywhere (v6) 5432 ALLOW Anywhere (v6) I still cannot access 5432!

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• Row Versioning Concurrency in SQL Server

  The optimistic concurrency model assumes that several concurrent transactions can usually complete without interfering with each other, and therefore do not require draconian locking on the resources they access. SQL Server 2005, and later, implements a form of this model called row versioning concurrency. It works by remembering the value of the data at the start of the transaction and checking that no other transaction has modified it before committing. If this optimism is justified for the pattern of activity within a database, it can improve performance by greatly reducing blocking. Kalen Delaney explains how it works in SQL Server.

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• What should be stored in UserContext?

  - by HonorGod

  From my general understanding I believe UserContext for a web application is supposed to hold user authentication and authorization (user roles) information. As part of user roles, there are definitions on who can access what data and accordingly the corresponding reference data is loaded into the UserContext as well. Is this a good practice to load and use reference data from UserContext? Does this have any impact with the number of sessions vs size of data it is holding inside JVM? I am thinking we use UserContext only for authentication and authorization but load the reference data from cache on demand and use it if required.

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• eSTEP TechCast - December 2012 Material Available

  - by Cinzia Mascanzoni

  The materials (presentation, replay) from the TechCast on "Innovations with Oracle Solaris Cluster 4" are now available for all of you via our eSTEP portal.  You will need to provide your email address and the pin below to access the downloads. Link to the portal is shown below. URL: http://launch.oracle.com/ PIN: eSTEP_2011 The downloads can be found under tab Events --> TechCast. Feel free to explore also the other delivered TechCasts and more useful information under the Download and Links tab. Any feedback is appreciated to help us improve the service and information we deliver.

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• boot problem with ubuntu and windows 8

  - by hunch

  i have a hp dv6 system. on which i was having the windows 8 installed. as i was interested in downloading the ubuntu 12.10 along with windows 8(not inside) .i have made separate partition in ubuntu 12.10 but some how it backfires and now i am not able to boot windows 8 and ubuntu. with windows 8 there is no drive to access the drive partition that has OS. with ubuntu i am getting blank screen. i am thinking that i have problem in system partition but i am not able to solve it. Plz help me. i am in a venerable condition... i have tried booting the window with the help of installation cd but iam not succesful in any of the method - 1-reset PC 2-RECOVERY 3- from command prompt i tried to check disks but it is not showing anything

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• Multiplayer in a game. How to design it object wise?

  - by Ninetou

  I was suggested on StackOverflow to ask this question here. I'm working on a simple game and I was thinking of adding multiplayer feature but I'm a bit stuck. I'm not sure what approach should I take, keeping in mind good programming practices. I have a Player object which is created for each player but then I have many other classes that would have to be able to access them. The thing is, if I initialise them in, let's say my main method, then I can't relate to different instances of player class from other classes. The only solution to my problem that comes to my mind is using some form of global objects but afaik using anything globally in apps is usually not a good practice. Any suggestions/ideas?

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• Global variable in a Linux shared library

  - by user3730495

  Suppose we have the following setup under Linux, .so library named "libcnt.so" and 3 user space apps: "app1", "app2", "app3". This library does 1 simple thing, it says to the app (app dynamically links the library at runtime) by how many apps it is already linked. Apps should have access to link counter. My knowledge in C and Linux is somewhat limited in this aspect, but as I understand this information should be stored in a global variable inside the shared object. Something like: in libcnt.h extern int cnt_loads; in libcnt.c int cnt_loads = 0; // where each linking increments this counter or something... So, my question is how it should be declared and/or defined inside .so library to guaranty that multiple apps from user space get the same instance of that variable counter?

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• Will a standard CMS on a shared web hosting account work for this?

  - by user1185305

  I have two questions concerning CMS's that I need answered if possible: I need to create a site with a Database. This site will in due time have lots of traffic and many users if things go as planned. Is it better to have the CMS on a shared web hosting account or is it better to have a dedicated server for this? The site I want to create needs to be able to create groups where each group has its own admin. The admin of the group decides the content that each member can view/access. The information of one group can be shared to other groups as well. This means that only the information content is shared but not the group's member data. Should I use a single or multiple databases for this problem? Is this something that can be done using standard CMS systems out there. or should I try to build one myself?

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• How can I make my Java desktop application to run on different computers in a network locally and updating same mysql database?

  - by JaMpa

  I have developed Java desktop application for registration of students in the computer laboratories in our college, but what I need is to make this application whenever it runs on any computer (Windows XP machines) on the laboratory each and every data filled by the college students goes to the same MySql database (through WAMP server) running on the server machine (Win Server 2003). Also, I need this application to run during booting of windows computers in the laboratory for the purpose when any student tries to switch on any PC in the comp lab before interfacing the desktop icons should sign in through user name and password when he has already registered or signing up in order for getting the access.

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• Is it advisable to ask employees to create 'work' GitHub accounts?

  - by fiorenti

  I've moved all our company Git repositories to GitHub and now I want to add employees to the projects. Since most employees already have personal GitHub accounts, I'm wondering whether I should ask them to create a work GitHub account. The reason that I'm thinking of doing this is to decrease the chances of unauthorized access to our code base since their personal accounts may be well publicized through their personal activity on the site, increasing chances of targeted attacks. Furthermore, if their personal account is ever compromised it won't mean the whole company code is accessible to the hijacker. Since this will bring the burden of maintaining two accounts for the employees I'm wondering whether it is the correct approach and whether it even makes sense. I would love to hear your opinions on this.

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• How is this paradigm/style called?

  - by McMannus

  I have the following situation: I'm developing an add-in for a UML modeling tool. The models that can be created by the user are stored inside the main application and a limited access to the models is given through its API. However, the add-in has a lot of callbacks for events that are triggered by the main application, when changes to the model occur by the user. Since the models are already stored once in the main application, I considered it not practicable to duplicate the models in the add-in, which leads to the fact that I have only behavior in the add-in, rather than having a state. This behavior is mainly expressed by static functions, that are organized in functional cohesive classes. The callbacks for the events have always references to the model elements relevant for the specifc event that ocurred. First, it seemed to me that this is a procedural style in general, but procedural style doesn't consider events/callbacks, so this boils down to the question. How is this programming style called?

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• Designing a hierarchical structure with lots of reads and writes?

  - by JD01

  I am in the process of working on a video on demand system part of it involves the management of a hierarchical tree structure (think windows explorer) which allows users to upload videos, move folders around, create new folders etc. User action will be allowed depending on which permissions they have. In addition to managing the structure (creating folders and uploading videos), subscribers will be viewing content (read access). The number of reads will be significantly more than the writes. My question (and it is big one) is should I store the data in a database (for the writes) and also have some sort of cache which will be used for the reads? or do I use two databases? or is there a better solution? Also I will have to resolve concurrency issues which I think optimistic locking on the database will resolve. I have a fair bit about CQRS over the last few months but not sure if this is the way to go. Any ideas?

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• Stuck in logon loop

  - by MJeffryes

  Here's the deal. I set up a computer with Ubuntu 10.04 for my grandmother. Everything worked fine. I connected it to the internet at her house today. After rebooting the computer I found that the computer would kick you back to the logon screen if you attempted to logon to her account. It worked fine logging on to my admin account, and also in Gnome's safe mode. I thought it had resolved itself, but turns out it hadn't, and now I don't have physical access to the computer, plus the remote connection I'd hoped to use only works intermittently. I need some suggestions for troubleshooting for when I'm at her house at some point next week. Ask for any more details, but I'm afraid I won't be able to provide many more until I've checked it out in person, since she is basically unable to use a computer beyond web browsing. Thanks in advance!

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• Create a HotSpot which requires a username and password

  - by Trumbun

  I wish to set up a wireless access point which requires a username and password in order for clients to use the internet. The network setup will be internet modem connected to an Ubuntu Server (2 networks cards). The first network cards to get the internet to the server and the second network card to connect the the wifi hotspot. The server will host the software such as (Example software for windows) which will control the user connected by forcing them to login with the credentials given at the reception. Can some suggest some software that I can use? Thanks in advance

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• Opening programs very slow on ubuntu 12.10

  - by Mislav Blaževic

  When I open any program for first time after boot, it loads VERY slowly (Doesn't matter how long after boot). For example, terminal takes 2-3 seconds, skype and firefox often take much longer. If I close it and open again, it loads in reasonable time (<1 second). I got Intel Core i5-2500K CPU @ 3.30GHz, so it shouldn't be hardware issue... What is causing this? Disk benchmark: Average read time: 115.5 MB/s (100 samples) Average write time: 98.7 MB/s (100 samples) Average access time: 11.79 msec (1000 samples)

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• Is there any remote desktop with sound and video capabilities allowing 2 different users work simultaniousely (a local and a remote one)?

  - by psihodelia

  I have a very powerful PC with Intel processor and a small Mac laptop with PowerPC processor. Both computers are with Ubuntu Linux. Mac laptop cannot play flash videos and I cannot install any Intel-CPU program on it (like Skype). So, it means I can install only open source applications on the laptop from Ubuntu repositories. I have two different Ubuntu system users on PC, say ME and SHE (and root as well :) ). If I work as user ME on PC, then user SHE should also be able to access my PC remotely from her laptop and she should see a desktop of user SHE, not my desktop. She also must be able watch videos, flash, and listen sounds. Is it possible with Ubuntu?

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• File recovery of windows after installing ubuntu

  - by user282619

  In one of my computers I installed ubuntu 14.04. Actually , I tried to dual-boot in along with windows 7 and I tried to do the partition during the ubuntu installation procedure. Now all of my 500 GB hard disk has been occupied by ubuntu and I cannot access windows. Since, I have all my documents in windows and I want to recover it. Will I be able to recovery my files of windows ? If yes, can you please help me with the solution ?

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• What is a good scripting language for FTP downloading

  - by WxPilot

  I need to develop some scripts for downloading files from a remote server to our file system. We need to grab files that have various timestamps, and place them into appropriate folders on our system. I'm probably opening quite the can of worms here, but which scripting language would be the best for getting this done? Right now I am using C Shell, which is working fine, but it is requiring multiple scripts because of the use of the ftp command. I wanted to know if there is a better option before I go too far into this project. There are no security concerns within the scripts as far as FTP accounts (public access FTP)

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