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  • OpenGL position from depth is wrong

    - by CoffeeandCode
    My engine is currently implemented using a deferred rendering technique, and today I decided to change it up a bit. First I was storing 5 textures as so: DEPTH24_STENCIL8 - Depth and stencil RGBA32F - Position RGBA10_A2 - Normals RGBA8 x 2 - Specular & Diffuse I decided to minimize it and reconstruct positions from the depth buffer. Trying to figure out what is wrong with my method currently has not been fun :/ Currently I get this: which changes whenever I move the camera... weird Vertex shader really simple #version 150 layout(location = 0) in vec3 position; layout(location = 1) in vec2 uv; out vec2 uv_f; void main(){ uv_f = uv; gl_Position = vec4(position, 1.0); } Fragment shader Where the fun (and not so fun) stuff happens #version 150 uniform sampler2D depth_tex; uniform sampler2D normal_tex; uniform sampler2D diffuse_tex; uniform sampler2D specular_tex; uniform mat4 inv_proj_mat; uniform vec2 nearz_farz; in vec2 uv_f; ... other uniforms and such ... layout(location = 3) out vec4 PostProcess; vec3 reconstruct_pos(){ float z = texture(depth_tex, uv_f).x; vec4 sPos = vec4(uv_f * 2.0 - 1.0, z, 1.0); sPos = inv_proj_mat * sPos; return (sPos.xyz / sPos.w); } void main(){ vec3 pos = reconstruct_pos(); vec3 normal = texture(normal_tex, uv_f).rgb; vec3 diffuse = texture(diffuse_tex, uv_f).rgb; vec4 specular = texture(specular_tex, uv_f); ... do lighting ... PostProcess = vec4(pos, 1.0); // Just for testing } Rendering code probably nothing wrong here, seeing as though it always worked before this->gbuffer->bind(); gl::Clear(gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT); gl::Enable(gl::DEPTH_TEST); gl::Enable(gl::CULL_FACE); ... bind geometry shader and draw models and shiz ... gl::Disable(gl::DEPTH_TEST); gl::Disable(gl::CULL_FACE); gl::Enable(gl::BLEND); ... bind textures and lighting shaders shown above then draw each light ... gl::BindFramebuffer(gl::FRAMEBUFFER, 0); gl::Clear(gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT); gl::Disable(gl::BLEND); ... bind screen shaders and draw quad with PostProcess texture ... Rinse_and_repeat(); // not actually a function ;) Why are my positions being output like they are?

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  • The Perfect Desktop - Ubuntu Studio 10.04

    <b>Howtoforge:</b> "This tutorial shows how you can set up an Ubuntu Studio 10.04 desktop that is a full-fledged replacement for a Windows desktop, i.e. that has all the software that people need to do the things they do on their Windows desktops. The advantages are clear: you get a secure system without DRM restrictions that works even on old hardware, and the best thing is: all software comes free of charge."

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  • 1.5 TB USB Drive failed to mount

    - by user89348
    Seagate 1.5Tb FreeAgent USB Hard Drive. Formatted FAT32. I figure it is 75% full. Used to work fine in XUBUNTU it shows up in Cairo Dock but when I click on it I get "failed to mount drive'. Nautilus does not display the icon nor does Thunar. Windows Vista will no longer recognise drive either. Back Track 5R3 also no longer fails to mount it. BUT and here is the BIG BUT my Pioneer DV-410 reads the files and plays the everything just fine. I believe this all happened after an unclean shutdown / XUbuntu 12.10 system freeze. Why can't XUBUNTU mount this drive when a crappy 13 year old DVD player can mount it. I am desperate to back up the data before just in case the drive becomes completely unreadable. Using XUBUNTU 12.10 Quantal current 3.5.0.17 Kernel (past 3 Kernels wont read it either) and all newest apt-get update / dist-upgrade are applied. I will post any other info you folks request as needed. Additional info as requested by githlar. $ sudo fsck.vfat /dev/sdb dosfsck 3.0.13, 30 Jun 2012, FAT32, LFN Read 512 bytes at 0:Input/output error $ lsusb Bus 001 Device 003: ID 148f:3070 Ralink Technology, Corp. RT2870/RT3070 Wireless Adapter Bus 002 Device 002: ID 0bc2:3001 Seagate RSS LLC Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

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  • Microsoft Plays the Open Source Software Game

    OS Roundup: Microsoft appears to have woken up to the fact that free open-source Office clones may be the thin end of a very slippery wedge. Its response is loud and clear, as it tells the world, when it comes to operating systems Microsoft intends to be a formidable competitor for some time to come.

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  • Microsoft Plays the Open Source Software Game

    OS Roundup: Microsoft appears to have woken up to the fact that free open-source Office clones may be the thin end of a very slippery wedge. Its response is loud and clear, as it tells the world, when it comes to operating systems Microsoft intends to be a formidable competitor for some time to come.

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  • A new Excel 2010 book for Data Analysis

    - by Marco Russo (SQLBI)
    Microsoft Press just announced the printing of Microsoft Excel 2010: Data Analysis and Business Modeling , which is the third edition of the book written by Wayne L. Winston covering many data analysis and modeling techniques using a very clear problem-solution approach, including a good statistical explanation whenever it is necessary. I suggest this book as a good complement to our Microsoft PowerPivot for Excel 2010: Give Your Data Meaning !...(read more)

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  • How to get my laptop to detect SD cards inserted into its built-in card reader?

    - by Candelight
    My laptop has a built-in SD Card reader but it cannot detect one when inserted. Here is the result when I type lspci from the terminal: 00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge (rev 10) 00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge 00:06.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge 00:07.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge 00:12.0 IDE interface: ATI Technologies Inc IXP SB400 Serial ATA Controller (rev 80) 00:13.0 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80) 00:13.1 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80) 00:13.2 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller (rev 80) 00:14.0 SMBus: ATI Technologies Inc IXP SB400 SMBus Controller (rev 83) 00:14.1 IDE interface: ATI Technologies Inc IXP SB400 IDE Controller (rev 80) 00:14.2 Audio device: ATI Technologies Inc IXP SB4x0 High Definition Audio Controller (rev 01) 00:14.3 ISA bridge: ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80) 00:14.4 PCI bridge: ATI Technologies Inc IXP SB400 PCI-PCI Bridge (rev 80) 00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration 00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map 00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller 00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control 01:05.0 VGA compatible controller: ATI Technologies Inc RS482 [Radeon Xpress 200M] 04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01) 05:04.0 FireWire (IEEE 1394): O2 Micro, Inc. Firewire (IEEE 1394) (rev 02) 05:04.2 SD Host controller: O2 Micro, Inc. Integrated MMC/SD Controller (rev 01) 05:04.3 Mass storage controller: O2 Micro, Inc. Integrated MS/xD Controller (rev 01) 05:09.0 Network controller: Ralink corp. RT2561/RT61 rev B 802.11g

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  • Webmasters hentry error and authorless pages

    - by Ben Racicot
    Within Google Webmasters Search Appearance-Structured data I'm getting a series of errors: Error: Missing required hCard "author". And most of my 44 errors have: Missing: Author Missing: entry-title Missing: updated There seems to be no CLEAR explanation of these errors. It is either because these classes exist without their nested classes, or they are expected to exist because of something else, possibly itemscope or itemtype='' The Question: How do you specify with richsnippets that the page is about a location and there is no human author?

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  • How to schedule daily backup in MSSQL Server 2008 Web Edition

    - by Xenon
    In MSSQL Management Studio I created a maintenance plan but it won't work Error is; "Message Executed as user: LITESPELL-19C34\Administrator. Microsoft (R) SQL Server Execute Package Utility Version 10.0.1600.22 for 32-bit Copyright (C) Microsoft Corp 1984-2005. All rights reserved. The SQL Server Execute Package Utility requires Integration Services to be installed by one of these editions of SQL Server 2008: Standard, Enterprise, Developer, or Evaluation. To install Integration Services, run SQL Server Setup and select Integration Services. The package execution failed. The step failed." But in Microsoft page http://www.microsoft.com/sqlserver/2008/en/us/web.aspx in Automate tasks and policies section it is written that backup can be scheduled in this edition but how?

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  • How is programming affected by spatial aptitude?

    - by natli
    The longer I work on a project, the less clear it becomes. It's like I cannot seperate various classes/objects anymore in my head. Everything starts mixing up, and it's extremely hard to take it all apart again. I start putting functions in classes where they really don't belong, and make silly mistakes such as writing code that I later find was 100% obsolete; things are no longer clearly mappable in my head. It isn't until I take a step back for several hours (or days somtimes!) that I can actually see what's going on again, and be productive. I usually try to fight through this, I am so passionate about coding that I wouldn't for the life of me know what else I could be doing. This is when stuff can get really weird, I get so up in my head that I sort of lose touch with reality (to some extent) in that various actions, such as pouring a glass of water, no longer happen on a concious level. It happens on auto pilot, during which pretty much all of my concious concentration (is that even a thing?) is devoted to borderline pointless problem solving (trying to seperate elements of code). It feels like a losing battle. So I took an IQ test a while ago (Wechsler Adult Intelligence Scale I believe it was) and it turned out my Spatial Aptitude was quite low. I still got a decent score, just above average, so I won't have to poke things with a stick for a living, but I am a little worried that this is such a handicap when writing/engineering computer programs that I won't ever be able to do it seriously or professionally. I am very much interested in what other people think of this.. could a low spatial aptitude be the cause of the above described problems? Maybe I should be looking more along the lines of ADD or something similar, because I did get diagnosed with ADD at the age of 17 (5 years ago) but the medicine I received didn't seem to affect me that much so I never took it all that serious. Sorry if I got a little off topic there, I know this is not a mental help board, the question should be clear; How is programming affected by spatial aptitude? As far as I know people are born with low/med/high spatial aptitude, so I think it's interesting to find out if the more fortunate are better programmers by birth right.

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  • BI Applications overview

    - by sv744
    Welcome to Oracle BI applications blog! This blog will talk about various features, general roadmap, description of functionality and implementation steps related to Oracle BI applications. In the first post we start with an overview of the BI apps and will delve deeper into some of the topics below in the upcoming weeks and months. If there are other topics you would like us to talk about, pl feel free to provide feedback on that. The Oracle BI applications are a set of pre-built applications that enable pervasive BI by providing role-based insight for each functional area, including sales, service, marketing, contact center, finance, supplier/supply chain, HR/workforce, and executive management. For example, Sales Analytics includes role-based applications for sales executives, sales management, as well as front-line sales reps, each of whom have different needs. The applications integrate and transform data from a range of enterprise sources—including Siebel, Oracle, PeopleSoft, SAP, and others—into actionable intelligence for each business function and user role. This blog  starts with the key benefits and characteristics of Oracle BI applications. In a series of subsequent blogs, each of these points will be explained in detail. Why BI apps? Demonstrate the value of BI to a business user, show reports / dashboards / model that can answer their business questions as part of the sales cycle. Demonstrate technical feasibility of BI project and significantly lower risk and improve success Build Vs Buy benefit Don’t have to start with a blank sheet of paper. Help consolidate disparate systems Data integration in M&A situations Insulate BI consumers from changes in the OLTP Present OLTP data and highlight issues of poor data / missing data – and improve data quality and accuracy Prebuilt Integrations BI apps support prebuilt integrations against leading ERP sources: Fusion Applications, E- Business Suite, Peoplesoft, JD Edwards, Siebel, SAP Co-developed with inputs from functional experts in BI and Applications teams. Out of the box dimensional model to source model mappings Multi source and Multi Instance support Rich Data Model    BI apps have a very rich dimensionsal data model built over 10 years that incorporates best practises from BI modeling perspective as well as reflect the source system complexities  Thanks for reading a long post, and be on the lookout for future posts.  We will look forward to your valuable feedback on these topics as well as suggestions on what other topics would you like us to cover. I Conformed dimensional model across all business subject areas allows cross functional reporting, e.g. customer / supplier 360 Over 360 fact tables across 7 product areas CRM – 145, SCM – 47, Financials – 28, Procurement – 20, HCM – 27, Projects – 18, Campus Solutions – 21, PLM - 56 Supported by 300 physical dimensions Support for extensive calendars; Gregorian, enterprise and ledger based Conformed data model and metrics for real time vs warehouse based reporting  Multi-tenant enabled Extensive BI related transformations BI apps ETL and data integration support various transformations required for dimensional models and reporting requirements. All these have been distilled into common patterns and abstracted logic which can be readily reused across different modules Slowly Changing Dimension support Hierarchy flattening support Row / Column Hybrid Hierarchy Flattening As Is vs. As Was hierarchy support Currency Conversion :-  Support for 3 corporate, CRM, ledger and transaction currencies UOM conversion Internationalization / Localization Dynamic Data translations Code standardization (Domains) Historical Snapshots Cycle and process lifecycle computations Balance Facts Equalization of GL accounting chartfields/segments Standardized values for categorizing GL accounts Reconciliation between GL and subledgers to track accounted/transferred/posted transactions to GL Materialization of data only available through costly and complex APIs e.g. Fusion Payroll, EBS / Fusion Accruals Complex event Interpretation of source data – E.g. o    What constitutes a transfer o    Deriving supervisors via position hierarchy o    Deriving primary assignment in PSFT o    Categorizing and transposition to measures of Payroll Balances to specific metrics to support side by side comparison of measures of for example Fixed Salary, Variable Salary, Tax, Bonus, Overtime Payments. o    Counting of Events – E.g. converting events to fact counters so that for example the number of hires can easily be added up and compared alongside the total transfers and terminations. Multi pass processing of multiple sources e.g. headcount, salary, promotion, performance to allow side to side comparison. Adding value to data to aid analysis through banding, additional domain classifications and groupings to allow higher level analytical reporting and data discovery Calculation of complex measures examples: o    COGs, DSO, DPO, Inventory turns  etc o    Transfers within a Hierarchy or out of / into a hierarchy relative to view point in hierarchy. Configurability and Extensibility support  BI apps offer support for extensibility for various entities as automated extensibility or part of extension methodology Key Flex fields and Descriptive Flex support  Extensible attribute support (JDE)  Conformed Domains ETL Architecture BI apps offer a modular adapter architecture which allows support of multiple product lines into a single conformed model Multi Source Multi Technology Orchestration – creates load plan taking into account task dependencies and customers deployment to generate a plan based on a customers of multiple complex etl tasks Plan optimization allowing parallel ETL tasks Oracle: Bit map indexes and partition management High availability support    Follow the sun support. TCO BI apps support several utilities / capabilities that help with overall total cost of ownership and ensure a rapid implementation Improved cost of ownership – lower cost to deploy On-going support for new versions of the source application Task based setups flows Data Lineage Functional setup performed in Web UI by Functional person Configuration Test to Production support Security BI apps support both data and object security enabling implementations to quickly configure the application as per the reporting security needs Fine grain object security at report / dashboard and presentation catalog level Data Security integration with source systems  Extensible to support external data security rules Extensive Set of KPIs Over 7000 base and derived metrics across all modules Time series calculations (YoY, % growth etc) Common Currency and UOM reporting Cross subject area KPIs (analyzing HR vs GL data, drill from GL to AP/AR, etc) Prebuilt reports and dashboards 3000+ prebuilt reports supporting a large number of industries Hundreds of role based dashboards Dynamic currency conversion at dashboard level Highly tuned Performance The BI apps have been tuned over the years for both a very performant ETL and dashboard performance. The applications use best practises and advanced database features to enable the best possible performance. Optimized data model for BI and analytic queries Prebuilt aggregates& the ability for customers to create their own aggregates easily on warehouse facts allows for scalable end user performance Incremental extracts and loads Incremental Aggregate build Automatic table index and statistics management Parallel ETL loads Source system deletes handling Low latency extract with Golden Gate Micro ETL support Bitmap Indexes Partitioning support Modularized deployment, start small and add other subject areas seamlessly Source Specfic Staging and Real Time Schema Support for source specific operational reporting schema for EBS, PSFT, Siebel and JDE Application Integrations The BI apps also allow for integration with source systems as well as other applications that provide value add through BI and enable BI consumption during operational decision making Embedded dashboards for Fusion, EBS and Siebel applications Action Link support Marketing Segmentation Sales Predictor Dashboard Territory Management External Integrations The BI apps data integration choices include support for loading extenral data External data enrichment choices : UNSPSC, Item class etc. Extensible Spend Classification Broad Deployment Choices Exalytics support Databases :  Oracle, Exadata, Teradata, DB2, MSSQL ETL tool of choice : ODI (coming), Informatica Extensible and Customizable Extensible architecture and Methodology to add custom and external content Upgradable across releases

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  • Is game development Subcontracted?

    - by Darv
    I was having a conversation with someone who believed that components of a games code where subcontracted out to programmers in different countries where it would be cheaper, then assembled by the local company. I understand that people often use pre-built engines but I would think that making the actual game would require people to work closely in the same studio. I couldn't find much clear information on this when I looked, does anyone know?

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  • Wireless drops on HP ENVY dv6 with RT3290 wireless, worked without problem prior to upgrading to Ubuntu 13.10, can it be fixed?

    - by Tim
    I have a HP ENVY dv6 Notebook PC with an AMD A10 quad core and RT3290 wireless. Since I upgraded from Ubuntu 13.04 to 13.10, the wireless connects, but then drops after a few minutes or longer, whether or not I am running openconnect to get through a VPN. If I attempt to run a remote X client (e.g. remote xterm) it drops. If I don't run an X client, it disconnects after a while, requiring a reload of the driver and reconnect. Wireless info... sudo lshw -c network *-network description: Wireless interface product: RT3290 Wireless 802.11n 1T/1R PCIe vendor: Ralink corp. physical id: 0 bus info: pci@0000:02:00.0 logical name: wlan0 version: 00 serial: 68:94:23:a7:09:cb width: 32 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=rt2800pci driverversion=3.11.0-12-generic firmware=0.37 ip=192.168.1.115 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn resources: irq:55 memory:f0210000-f021ffff I have successfully built and installed the MediaTek driver with no luck on connecting, then the system hangs on reboot and I have to recover/undo the changes to boot successfully.

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  • What should filenames and URLs of images contain for SEO benefit?

    - by Baumr
    We know that good site architecture usually looks like this: example-company.com/ example-company.com/about/ example-company.com/contact/ example-company.com/products/ example-company.com/products/category/ example-company.com/products/category/productname/ Now, when it comes to Google Image search, it is clear that the img alt tag, filename/URL, and surrounding text (captions, headings, paragraphs) have an effect on ranking. I want to ask about the filename of the images that we should use (e.g. product-photo.jpg). ...but first about the URL: Often web developers stick all images in a single folder in the root: example-company.com/img/ — and I have stopped doing that. (I don't want to get into it, but basically, it seems more semantic for images which make up part of the content at each sub-directory) However, when all images appear in a folder, I feel that their filename needs to reflect what they are a bit more than usual, for example: example-company.com/img/example-company-productname-category.jpg It's a longer filename than just product.png, but as long as it's relevant, I see no problem with regards to SEO (unless you're keyword stuffing), and it could even help rank for keywords: "example company" "productname" "category" So no questions there. But what about when we have places images in the site architecture we outlined at the beginning? In other words, what if image URL paths look like this: example-company.com/products/category/productname/productname.jpg My question is, should the URL be kept short like above and only have the "productname" (and some descriptive keywords) as part of it's filename? Or, should it also include the "example-company" and "category"? Like so: example-company.com/products/category/productname/example-company-category-productname.jpg That seems much longer, and redundant when we look at the URL, but here are a few considerations. Images are often downloaded onto computers, and, to the average user, they lose their original URL and thus — it isn't clear where they came from. Also, some social networks, forums, and other platforms leave the filename intact when uploaded. (Many others rewrite it, for example, Pinterest and Facebook.) Another consideration, will this really help (even if ever so slightly) rank in Google Image Search, or at least inform Google that the product is something specific to the "example-company"? For example, what if this product can only be bought at this store and is the flagship product? In addition to an abundance of internal links to this product page, would having the "example company" name and "category" help it appear in "example company" searches? In other words, is less more?

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  • Testing Workflows &ndash; Test-First

    - by Timothy Klenke
    Originally posted on: http://geekswithblogs.net/TimothyK/archive/2014/05/30/testing-workflows-ndash-test-first.aspxThis is the second of two posts on some common strategies for approaching the job of writing tests.  The previous post covered test-after workflows where as this will focus on test-first.  Each workflow presented is a method of attack for adding tests to a project.  The more tools in your tool belt the better.  So here is a partial list of some test-first methodologies. Ping Pong Ping Pong is a methodology commonly used in pair programing.  One developer will write a new failing test.  Then they hand the keyboard to their partner.  The partner writes the production code to get the test passing.  The partner then writes the next test before passing the keyboard back to the original developer. The reasoning behind this testing methodology is to facilitate pair programming.  That is to say that this testing methodology shares all the benefits of pair programming, including ensuring multiple team members are familiar with the code base (i.e. low bus number). Test Blazer Test Blazing, in some respects, is also a pairing strategy.  The developers don’t work side by side on the same task at the same time.  Instead one developer is dedicated to writing tests at their own desk.  They write failing test after failing test, never touching the production code.  With these tests they are defining the specification for the system.  The developer most familiar with the specifications would be assigned this task. The next day or later in the same day another developer fetches the latest test suite.  Their job is to write the production code to get those tests passing.  Once all the tests pass they fetch from source control the latest version of the test project to get the newer tests. This methodology has some of the benefits of pair programming, namely lowering the bus number.  This can be good way adding an extra developer to a project without slowing it down too much.  The production coder isn’t slowed down writing tests.  The tests are in another project from the production code, so there shouldn’t be any merge conflicts despite two developers working on the same solution. This methodology is also a good test for the tests.  Can another developer figure out what system should do just by reading the tests?  This question will be answered as the production coder works there way through the test blazer’s tests. Test Driven Development (TDD) TDD is a highly disciplined practice that calls for a new test and an new production code to be written every few minutes.  There are strict rules for when you should be writing test or production code.  You start by writing a failing (red) test, then write the simplest production code possible to get the code working (green), then you clean up the code (refactor).  This is known as the red-green-refactor cycle. The goal of TDD isn’t the creation of a suite of tests, however that is an advantageous side effect.  The real goal of TDD is to follow a practice that yields a better design.  The practice is meant to push the design toward small, decoupled, modularized components.  This is generally considered a better design that large, highly coupled ball of mud. TDD accomplishes this through the refactoring cycle.  Refactoring is only possible to do safely when tests are in place.  In order to use TDD developers must be trained in how to look for and repair code smells in the system.  Through repairing these sections of smelly code (i.e. a refactoring) the design of the system emerges. For further information on TDD, I highly recommend the series “Is TDD Dead?”.  It discusses its pros and cons and when it is best used. Acceptance Test Driven Development (ATDD) Whereas TDD focuses on small unit tests that concentrate on a small piece of the system, Acceptance Tests focuses on the larger integrated environment.  Acceptance Tests usually correspond to user stories, which come directly from the customer. The unit tests focus on the inputs and outputs of smaller parts of the system, which are too low level to be of interest to the customer. ATDD generally uses the same tools as TDD.  However, ATDD uses fewer mocks and test doubles than TDD. ATDD often complements TDD; they aren’t competing methods.  A full test suite will usually consist of a large number of unit (created via TDD) tests and a smaller number of acceptance tests. Behaviour Driven Development (BDD) BDD is more about audience than workflow.  BDD pushes the testing realm out towards the client.  Developers, managers and the client all work together to define the tests. Typically different tooling is used for BDD than acceptance and unit testing.  This is done because the audience is not just developers.  Tools using the Gherkin family of languages allow for test scenarios to be described in an English format.  Other tools such as MSpec or FitNesse also strive for highly readable behaviour driven test suites. Because these tests are public facing (viewable by people outside the development team), the terminology usually changes.  You can’t get away with the same technobabble you can with unit tests written in a programming language that only developers understand.  For starters, they usually aren’t called tests.  Usually they’re called “examples”, “behaviours”, “scenarios”, or “specifications”. This may seem like a very subtle difference, but I’ve seen this small terminology change have a huge impact on the acceptance of the process.  Many people have a bias that testing is something that comes at the end of a project.  When you say we need to define the tests at the start of the project many people will immediately give that a lower priority on the project schedule.  But if you say we need to define the specification or behaviour of the system before we can start, you’ll get more cooperation.   Keep these test-first and test-after workflows in your tool belt.  With them you’ll be able to find new opportunities to apply them.

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  • What Does Latent Semantic Indexing Really Mean?

    Too many article writers are completely misunderstanding what latent semantic indexing is all about, and many people seem to be under the impression that LSI is something an SEO article service can produce. Once and for all, let's get it quite clear what LSI is all about...

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  • cloud programming for OpenStack in C / C++

    - by Basile Starynkevitch
    (Sorry for such a fuzzy question, I am very newbie to cloud programming) I am interested in designing (and developing) a (free software) program in C or C++ (probably, most of it being meta-programmed, i.e. part of the C code code being generated). I am still in the thinking / designing phase. And I might perhaps give up. For reference, I am the main architect and implementor of GCC MELT, a domain specific language to extend the GCC compiler (the MELT language is translated to C/C++ and is bootstrapped: the MELT to C/C++ translator being written in MELT). And I am dreaming of extending it with some cloud computing abilities. But I am a newbie in cloud computing. (I am only interested in free-software, GPLv3 friendly, based cloud computing, which probably means openstack). I believe that "compiling on the cloud with some enhanced GCC" could make sense (for super-optimizations or static analysis of e.g. an entire Linux distribution, or at least a massive GCC compiled free software like Qt, GCC itself, or the Linux kernel). I'm dreaming of a MELT specific monitoring program which would store, communicate, and and enhance GCC compilation (extended by MELT). So the picture would be that each GCC process (actually the cc1 or cc1plus started by the gcc driver, suitably extended by some MELT extension) would communicate with some monitor. That "monitoring/persisting" program would run "on the cloud" (and probably manage some information produced by GCC e.g. on NoSQL bases). So, how should some (yet to be written) C program (some Linux daemon) be designed to be cloud-friendly? So far, I understood that it should provide some Web service, probably thru a RESTful service, so should use an HTTP server library like onion. And that OpenStack is able to start (e.g. a dozen of) such services. But I don't have a clear picture of what OpenStack brings. So far, I noticed the ability to manage (and distribute) virtual machines (with some Python API). It is less clear how can it distribute some ELF executable, how can it start it, etc. Do you have any references or examples of C / C++ programming on the cloud? How should a "cloud-friendly" (actually, OpenStack friendly) C/C++ server application be designed?

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  • Cumulative Update #8 for SQL Server 2008 SP3 is available

    - by AaronBertrand
    Today Microsoft has released a new cumulative update for SQL Server 2008 SP3. KB article: KB #2771833 There are 9 fixes listed at the time of writing The build number is 10.00.5828.00 Relevant for @@VERSION between 10.00.5500 and 10.00.5827 It seems clear that Service Pack 2 servicing has been discontinued. So there is even less reason to hold onto those old builds, and every reason to upgrade to Service Pack 3 . As usual, I'll post my standard disclaimer here: these updates are NOT for SQL Server...(read more)

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  • T-SQL Tuesday #19: Blind Spots

    - by merrillaldrich
    A while ago I wrote a post, Visualize Disaster , prompted by a real incident we had at my office. Fortunately we came through it OK from a business point of view, but I took away an important lesson: it’s very easy, whether your organization and your team is savvy about disaster recovery or not, to have significant blind spots with regard to recovery in the face of some large, unexpected outage. We have very clear direction and decent budgets to work with, and the safety and recoverability of applications...(read more)

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  • Make your TSQL easier to read during a presentation

    - by fatherjack
    SQL Server Management Studio 2012 has some neat settings that you can use to help your presentations at a SQL event better for the attendees if you are willing to spend a few minutes making some settings changes. Historically, I have been reluctant to make changes to my SSMS settings as it is such a tedious process and it's not 100% clear that what you think you are changing is actually what gets changed. With SSMS 2012 this has become a lot easier and a...(read more)

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  • T-SQL User-Defined Functions: the good, the bad, and the ugly (part 3)

    - by Hugo Kornelis
    I showed why T-SQL scalar user-defined functions are bad for performance in two previous posts. In this post, I will show that CLR scalar user-defined functions are bad as well (though not always quite as bad as T-SQL scalar user-defined functions). I will admit that I had not really planned to cover CLR in this series. But shortly after publishing the first part , I received an email from Adam Machanic , which basically said that I should make clear that the information in that post does not apply...(read more)

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  • PASS Summit Location follow up - result analysis

    - by simonsabin
    I've had a chance to look at the results directly and it is clear that there is a tough choice. On the one hand people are saying that they prefer to have PASS put their money into chapters and things like 24hrs of PASS rather than an event on the east coast. Whilst at the same time almost 50% more people said they would be more likely to attend an East Coast event than a Seattle event, and 60% more said they would be more likley to attend a US Central region event. Whats more 60% said that the summit should be outside of Seattle every other year with only 19% saying it should always stay in Seattle. So clearly there is a huge desire for a non Seattle event. Looking at the other reasons for keeping in Seattle and the big one being that people want Microsoft speakers. More people think its somewhat important of very important that the conference is in walking distance of the hotels and restaurants. Essentially the Q6 questions show an even balance for normal conference, highlighting that they are prepared to travel, not with the family and they want a well laid out conference. Whats very annoying is that the questions, as people have commented, were biased towards certain answers. For instance there was no option about whether people feel its important to have industry leading speakers, MVPs etc at the conference. Only questions about Microsoft speakers. I know survey writing is very difficult to avoid biasing the answers one way or another. There was also no choice to show peoples preference, would people prefer Microsoft speakers or the summit to be held on the East Coast/Central US. I also find it amazing that people prefer hundres of developers rather than the SQLCAT and CSS teams, surely that indicates another issue about a lack of understanding of what the these teams do. All in all it is clear that people showed they want an event outside of Seattle and don't want PASS to be putting money into that instead of into other community activites. I find it suprising that there appears to have been a huge weighting against certain questions which have prioritised them over the huge desire for a PASS summit outside of Seattle. Lets see where we will be in 2013 or maybe they will rethink 2012 who knows.

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