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• What are the valid DepthBuffer Texture formats in DirectX 11? And which are also valid for a staging resource?

  - by sebf

  I am trying to read the contents of the depth buffer into main memory so that my CPU side code can do Some Stuff™ with it. I am attempting to do this by creating a staging resource which can be read by the CPU, which I will copy the contents of the depth buffer into before reading it. I keep encountering errors however, because of, I believe, incompatibilities between the resource format and the view formats. Threads like these lead me to believe it is possible in DX11 to access the depth buffer as a resource, and that I can create a resource with a typeless format and have it interpreted in the view as another, but I cannot get it to work. What are the valid formats for the resource to be used as the depth buffer? Which of these are also valid for a CPU accessible staging resource?

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• Missing Index on CI_SEV_PROC table (CCB 2.3.1)

  - by ACShorten

  One of our customers reported performance issues with the severence processes in Oracle Utilities Customer Care And Billing V2.3.1 and after investigation a base index was found to be missing in the base package installation scripts. This index can be created manually to address any performance issues in this part of the system. For details of the index creation, refer to the KB Article on My Oracle Support KB 1431632.1 Index Missing On CI_SEV_PROC Table.

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• Using multiple indexes with buffer objects in OpenTK

  - by Rushyo

  I've got multiple buffers in OpenGL holding data on position, normals and texcoords. I also have an equal number of buffers holding distinct index data for each of those buffers. I quite like this format (indvidual indexes for each buffer) utilised by COLLADA since it strikes me as optimally efficient at accessing each buffer. I've set up pointers to the relevant data arrays using VertexPointer, NormalPointer, etc however I have no way to assign pointers to the index buffers since DrawElements appear to only look at one ElementArrayBuffer. Can I utilise multiple indices some way or will I be better off using a different technique which can support this? I'd prefer to keep the distinct indices if at all possible.

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• Getting Started with the New Column Store Index of SQL Server 2012

  Column Store Index, a new feature in SQL Server 2012, improves performance of data warehouse queries several folds. Arshad Ali shows you how to create column store index, and how to use index query hint to include or exclude a column store index. Schedule Azure backupsRed Gate’s Cloud Services makes it simple to create and schedule backups of your SQL Azure databases to Azure blob storage or Amazon S3. Try it for free today.

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• write to depth buffer while using multiple render targets

  - by DocSeuss

  Presently my engine is set up to use deferred shading. My pixel shader output struct is as follows: struct GBuffer { float4 Depth : DEPTH0; //depth render target float4 Normal : COLOR0; //normal render target float4 Diffuse : COLOR1; //diffuse render target float4 Specular : COLOR2; //specular render target }; This works fine for flat surfaces, but I'm trying to implement relief mapping which requires me to manually write to the depth buffer to get correct silhouettes. MSDN suggests doing what I'm already doing to output to my depth render target - however, this has no impact on z culling. I think it might be because XNA uses a different depth buffer for every RenderTarget2D. How can I address these depth buffers from the pixel shader?

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• OpenGL : Keeping alpha in a render buffer

  - by Cyan

  In my current task, i need to render a texture into a render buffer, in order to work on it (apply special filters) there. The result is then considered a "new texture", which is later displayed. This works fine, except when the texture contains some transparent/semi-transparent parts. My current guess it that, within the render buffer, the texture is "merged" with a kind of "grey background". In this case, it obviously impacts the R,G,B color components of transparent pixels. I've yet to find a way around this. Even manually assigning alpha after the rendering process doesn't save the day for semi-transparent pixels, which RGB are "tainted" by the grey background.

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• What is the default buffer size of CreateFile in Windows?

  - by Jinx

  When CreateFile Function is called without the flag FILE_FLAG_NO_BUFFERING, what is the size of the inner buffer of operating system? If my buffer size is larger than the inner buffer of Windows, can I fully use up the throughput of disk?

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• How good is the memory mapped Circular Buffer on Wikipedia?

  - by abroun

  I'm trying to implement a circular buffer in C, and have come across this example on Wikipedia. It looks as if it would provide a really nice interface for anyone reading from the buffer, as reads which wrap around from the end to the beginning of the buffer are handled automatically. So all reads are contiguous. However, I'm a bit unsure about using it straight away as I don't really have much experience with memory mapping or virtual memory and I'm not sure that I fully understand what it's doing. What I think I understand is that it's mapping a shared memory file the size of the buffer into memory twice. Then, whenever data is written into the buffer it appears in memory in 2 places at once. This allows all reads to be contiguous. What would be really great is if someone with more experience of POSIX memory mapping could have a quick look at the code and tell me if the underlying mechanism used is really that efficient. Am I right in thinking for example that the file in /dev/shm used for the shared memory always stays in RAM or could it get written to the hard drive (performance hit) at some point? Are there any gotchas I should be aware of? As it stands, I'm probably going to use a simpler method for my current project, but it'd be good to understand this to have it in my toolbox for the future. Thanks in advance for your time.

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• How can you buffer two online videos alternately while playing one of them?

  - by Rajats1234

  On my website, I want my user to be able to launch video 2 at any point in the middle of video 1 without waiting or refreshing the window. How can I buffer the two videos such that I buffer video 1 enough to let it start playing, and then buffer just enough of video 2 that if the user launches it at any point, he does not have to wait to view its first few seconds, and then I can come back and buffer the rest of video 1? If this is not possible, I could also look at buffering video 1 and 2 in parallel while playing only video 1. Thanks!

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• How can I load a SQLITE database from a buffer with the C API ?

  - by rockeye

  Hello, I am trying to load a database from the memory instead of opening a .sqlite file. I have read the C/C++ API reference but I can not find the proper method. The buffer I am trying to load is simply an sqlite file loaded in memory. I just want to use this buffer (a const char* array) without using the filesystem (I could have saved this buffer in a file, then load the file, but no). First, I create a memory DB : mErrorCode = sqlite3_open_v2(":memory:", &mSqlDatabase, lMode, NULL); This returns SQLITE_OK, then I tried to use the buffer as a statement and call preparev2(MyDB, MyBufferData, MyBufferLength, MyStatement, NULL) but it's not really a statement, and it returns an error. Same result if I call directly exec(MyDB, MyBufferData, NULL, NULL, NULL); I guess there is an appropriate method to achieve this as it might be common to load a DB from a stream or from decrypted data... Thanks.

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• SQL Server database with clustered GUID PKs - switch clustered index or switch to sequential (comb)

  - by Eyvind

  We have a database in which all the PKs are GUIDs, and most of the PKs are also the clustered index for the table. We know that this is bad (due to the random nature of GUIDs). So, it seems there are basically two options here (short of throwing out GUIDs as PKs altogether, which we cannot do (at least not at this time)). We could change the GUID generation algorithm to e.g. the one that NHibernate uses, as detailed in this post, or we could, for the tables that are under the heaviest use, change to a different clustered index, e.g. an IDENTITY column, and keep the "random" GUIDs as PKs. Is it possible to give any general recommendations in such a scenario? The application in question has 500+ tables, the largest one presently at about 1,5 million rows, a few tables around 500 000 rows, and the rest significantly lower (most of them well below 10K). Furthermore, the application is installed at several customer sites already, so we have to take any possible negative effects for existing customer into consideration. Thanks!

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• MS SQL Database with clustered GUID PKs - switch clustered index or switch to sequential (comb) GUID

  - by Eyvind

  We have a database in which all the PKs are GUIDs, and most of the PKs are also the clustered index for the table. We know that this is bad (due to the random nature of GUIDs). So, it seems there are basically two options here (short of throwing out GUIDs as PKs altogether, which we cannot do (at least not at this time)). We could change the GUID generation algorithm to e.g. the one that NHibernate uses, as detailed in this post, or we could, for the tables that are under the heaviest use, change to a different clustered index, e.g. an IDENTITY column, and keep the "random" GUIDs as PKs. Is it possible to give any general recommendations in such a scenario? The application in question has 500+ tables, the largest one presently at about 1,5 million rows, a few tables around 500 000 rows, and the rest significantly lower (most of them well below 10K). Furthermore, the application is installed at several customer sites already, so we have to take any possible negative effects for existing customer into consideration. Thanks!

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• onItemClick gives index/ position of item on visible page ... not actual index of the item in list .

  - by Abhinav

  hi, I am creating a list .. the elements of the list are drawn from sqlite database .. I populate the list using ArrayList and ArrayAdapter ...upon clicking the items on the list I want to be able to fire an intent containing info about the item clicked ... info like the index number of the item .. using the method : onItemClick(AdapterView av, View v, int index, long arg) I do get index of the item clicked . however it is of the list currently displayed . the problem comes when I do setFilterTextEnabled(true) , and on the app type in some text to to search some item ..and then click it ..rather than giving me the index of the item on the original list it gives me the index on filtered list.. following is the snippet of code: myListView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> av, View v, int index, long arg) { Intent lyricsViewIntent = new Intent(iginga.this, LyricsPage.class); lyricsViewIntent.putExtra("title", songList.get((int)arg).getTitle()); lyricsViewIntent.putExtra("id", songList.get((int)arg).getSongId()); startActivity(lyricsViewIntent); } }); myListView.setTextFilterEnabled(true); Is there any way I can get the original index /position of the item instead of the one showing in filtered text ...when filtered.

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• z index background issue in IE

  - by Michael

  I have a jQuery tools scroller set up with controls managing two separate divs of info - one images, the other related text that needs to sit over the top of the images with a transparent bg image. I am using z-indexing to achieve this and am aware of IE's issues with this but am unable to sort it (tested in IE6-8). Image of the issue below: http://test.shakingpaper.com.au/not_working.png It seems that the overlayed div is taking on the containers white. Try as I might, I can't resolve this. HTML/CSS code below: <div id="content"> <div id="nav"></div> <div class="s4 slideshow"> <div> <img src="<?php bloginfo('stylesheet_directory'); ?>/images/hero_1_white.jpg" width="770" height="367" /> </div> <div> <img src="<?php bloginfo('stylesheet_directory'); ?>/images/hero_1_white.jpg" width="770" height="367" /> </div> <div> <img src="<?php bloginfo('stylesheet_directory'); ?>/images/hero_1_white.jpg" width="770" height="367" /> </div> </div> <div id="overlay_bg"></div> <div class="s4 information"> <div> <h1>Support</h1> <p>Quisque lacus quam, egestas ac tincidunt a, lacinia vel velit. Aenean facilisis nulla vitae.</p> <p><a href="#">Support Us</a></p> </div> <div> <h1>Events</h1> <p>Quisque lacegestas ac tincidunt a, lacinia vel velit. Aenean facilisis nulla vitae.</p> <p><a href="#">Read More</a></p> </div> <div> <h1>Regional</h1> <p>Quisque lacus quam, egestas ac tincidunt a, lacinia vel velit. Aenean facilisis nulla vitae.</p> <p><a href="#">Support Us</a></p> </div> </div> </div> <!-- end of content --> #content { height: auto; min-height: 300px !important; overflow: hidden; position:relative; margin-left: 27px; width: 770px; padding-bottom: 43px; } #nav { width: 60px; z-index: 10000; position: absolute; top:340px; left: 28px; } .s4 { width: 770px; height: 370px; overflow: hidden; } #nav a { background-color: transparent; background-image: url(images/transition.png); background-position: 0 0; text-indent: -1000em; width: 10px; height: 10px; display: block; float: left; margin-right: 5px; } #nav a.activeSlide { background-position: 0 -10px; } #overlay_bg { background: url(images/soild_block.png) no-repeat; width: 318px; height: 339px; z-index: 5000; position: absolute; top: 28px; } .information { position: absolute; top: 60px; left: 28px; z-index: 16000; width: 290px; height: 260px; color: #FFF; } .information h1 { font-size: 50px; font-style: italic; text-transform: uppercase; } .information p { font-size: 17px; line-height: 27px; margin-top: 37px; } .information a { font-size: 13px; padding-bottom: 2px; border-bottom: 1px solid; color: #FFF; text-transform: uppercase; font-style: italic; } .information a:hover { color: #000; } Any help would be greatly appreciated.

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• Same index for all (sub-)directories?

  - by whatisthis

  Hi. I was wondering if it was possible to write some .htaccess page that makes the server use an index.php file in a SINGLE directory as the index file for every directory/sub-directory on my server, rather than placing the exact same index.php in 200+ directories. If my description isn't clear, what I essentially mean is: /files/index.php is to be used as the index for, for example, /files/morefiles, as well as the index for all directories and sub-directories within /files/, even though those directories would not have an index file themselves. Thanks to all in advance.

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• Vertical index for TableViewControllers

  - by Martin

  Hello It may be quite easy to do, but I can't find out how : I want to add a vertical index in my sorted tableViewController, like in the "Contacts" application. Any idea ? Thks Martin

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• jQuery RadioButton index

  - by Tomas

  Hello How to get checked RadioButton Index using jQuery? I need to read it and save to cookies to load status later using code $('input[name="compression"]')[{Reading from cookies code}].checked = true; 1<input name="compression" type="radio" value="1" checked="checked" /> 2<input name="compression" type="radio" value="2" /> 3<input name="compression" type="radio" value="3" /> Regards Tomas

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• Why is postgresql update query so slow sometimes, even with index

  - by Matija

  i have a simple update query (foo column type is BOOLEAN (default false)): update tablename set foo = true where id = 234; which "id" is set to (primary) key, and if i run "explain analyze" i got: Index Cond: (id = 234) Total runtime: 0.358 ms but still, i have plenty of unexplained queries at slow log (pgfouine), which took more than 200s (?!): Times executed: 99, Av. duration (s): 70 can anyone please explain, whats the reason for that? (1.5 mio rows in table, postgresql 8.4)

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• Using an index to get an item, Python

  - by anteater7171

  I have a list in python ('A','B','C','D','E'), how do I get which item is under a particular index number? Example: Say it was given 0, it would return A. Given 2, it would return C. Given 4, it would return E.

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• setting z-index jquery ui controls?

  - by maxp

  Annoyingly, the jquery ui's set a few css properties inline, making it impossible to override them in the stylesheet. I tried to override the values with jquery, but then they get changed back as soon as the control is interacted with. Does anyone know if any of the jquery ui control's initialisers/constructors have the ability to override their z-index value or set other css properties?

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• jQuery oembed plugin z-index problem

  - by Ben

  I'm using the jQuery oembed plugin to display videos from a Vimeo feed. The only problem is they display over the top of my navigation menu. I have tried setting the z-index of the menu but this makes no difference. A common suggestion seems to be to set the wmode parameter to transparent or opaque. However, passing this as a parameter to the oembed function makes no difference. Thanks

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• Help with z-index issue with menu in IE7

  - by Ryan Tomlinson

  Has anyone got any idea why the menu is rendering below the rotating images on this site in IE7: http://new.coffeelatino.co.uk/. The z-index is much higher for the menu that it is for the rotating images. Just another reason why IE is so dreadful.

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• Google Maps, Z Index and Drop Down Javascript menus

  - by [ebarrera]

  I've run on a little problem today: I have a JS drop down menu and when I inserted a GoogleMap... the Menu is rendered behind the Google Map... Any ideas on how to chance the z Index of the Google Map? Thanks!

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• Setting clustered index in nhibernate

  - by SolBadguy

  Hi. I'm trying to define a property that is not the id as a clustered index in nhibernate, yet I've found no way of doing this. Could anyone give me a pointer of how this is done, or it is something not currently available in nhibernate? Thanks in advance

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• MySQL won't use index for query?

  - by Jack Sleight

  I have this table: CREATE TABLE `point` ( `id` INT(11) NOT NULL AUTO_INCREMENT, `siteid` INT(11) NOT NULL, `lft` INT(11) DEFAULT NULL, `rgt` INT(11) DEFAULT NULL, `level` SMALLINT(6) DEFAULT NULL, PRIMARY KEY (`id`), KEY `point_siteid_site_id` (`siteid`), CONSTRAINT `point_siteid_site_id` FOREIGN KEY (`siteid`) REFERENCES `site` (`id`) ON DELETE CASCADE ) ENGINE=INNODB AUTO_INCREMENT=35 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci And this query: SELECT * FROM `point` WHERE siteid = 1; Which results in this EXPLAIN information: +----+-------------+-------+------+----------------------+------+---------+------+------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+----------------------+------+---------+------+------+-------------+ | 1 | SIMPLE | point | ALL | point_siteid_site_id | NULL | NULL | NULL | 6 | Using where | +----+-------------+-------+------+----------------------+------+---------+------+------+-------------+ Question is, why isn't the query using the point_siteid_site_id index?

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