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  • How do I create a downscaled copy of an FBO in OpenGL?

    - by Jasper Bekkers
    Hi, In order to speed up some post-processing shaders I'm using, I need to perform these operations on a framebuffer that is smaller in size than the actual window (about 1/4th or more). Most of the effects I want to optimize are simple blurring operations that could be replaced (for a large part) by smaller kernel and bilinear filtering. Thus, I need to create a copy of the current FBO into another one. However, I couldn't find anything, that works, on how to do this. I've tried using glBlitframebufferEXT and rendering a fullscreen quad into the other framebuffer, but both paths result in a black texture as output. How do I go about solving this problem?

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  • SQLAlchemy unsupported type error - and table design issues?

    - by Az
    Hi there, back again with some more SQLAlchemy shenanigans. Let me step through this. My table is now set up as so: engine = create_engine('sqlite:///:memory:', echo=False) metadata = MetaData() students_table = Table('studs', metadata, Column('sid', Integer, primary_key=True), Column('name', String), Column('preferences', Integer), Column('allocated_rank', Integer), Column('allocated_project', Integer) ) metadata.create_all(engine) mapper(Student, students_table) Fairly simple, and for the most part I've been enjoying the ability to query almost any bit of information I want provided I avoid the error cases below. The class it is mapped from is: class Student(object): def __init__(self, sid, name): self.sid = sid self.name = name self.preferences = collections.defaultdict(set) self.allocated_project = None self.allocated_rank = 0 def __repr__(self): return str(self) def __str__(self): return "%s %s" %(self.sid, self.name) Explanation: preferences is basically a set of all the projects the student would prefer to be assigned. When the allocation algorithm kicks in, a student's allocated_project emerges from this preference set. Now if I try to do this: for student in students.itervalues(): session.add(student) session.commit() It throws two errors, one for the allocated_project column (seen below) and a similar error for the preferences column: sqlalchemy.exc.InterfaceError: (InterfaceError) Error binding parameter 4 - probably unsupported type. u'INSERT INTO studs (sid, name, allocated_rank, allocated_project) VALUES (?, ?, ?, ?, ?, ?, ?)' [1101, 'Muffett,M.', 1, 888 Human-spider relationships (Supervisor id: 123)] If I go back into my code I find that, when I'm copying the preferences from the given text files, it actually refers to the Project class which is mapped to a dictionary, using the unique project id's (pid) as keys. Thus, as I iterate through each student via their rank and to the preferences set, it adds not a project id, but the reference to the project id from the projects dictionary. students[sid].preferences[int(rank)].add(projects[int(pid)]) Now this is very useful to me since I can find out all I want to about a student's preferred projects without having to run another check to pull up information about the project id. The form you see in the error has the object print information passed as: return "%s %s (Supervisor id: %s)" %(self.proj_id, self.proj_name, self.proj_sup) My questions are: I'm trying to store an object in a database field aren't I? Would the correct way then, be copying the project information (project id, name, etc) into its own table, referenced by the unique project id? That way I can just have the project id field for one of the student tables just be an integer id and when I need more information, just join the tables? So and so forth for other tables? If the above makes sense, then how does one maintain the relationship with a column of information in one table which is a key index on another table? Does this boil down into a database design problem? Are there any other elegant ways of accomplishing this? Apologies if this is a very long-winded question. It's rather crucial for me to solve this, so I've tried to explain as much as I can, whilst attempting to show that I'm trying (key word here sadly) to understand what could be going wrong.

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  • What tech stack/platform to use for a project?

    - by danny z
    Hey guys, This is a bit of a weird meta-programming question, but I've realized that my new project doesn't need a full MVC framework, and being a rails guy, I'm not sure what to use now. To give you a gist of the necessary functionality; this website will display static pages, but users will be able to log in and 'edit their current plans'. All purchasing and credit card editing is being handled by a recurring payment subscriber, I just need a page to edit their current plan. All of that will be done through (dynamic) XML API calls, so no database is necessary. Should I stick with my typical rails/nginx stack, or is there something I could use that would lighten the load, since I don't need the Rails heft. I'm familiar with python and PHP but would prefer not to go that route. Is Sinatra a good choice here? tl;dr: What's a good way to quickly serve mostly static pages, preferably in Ruby, with some pages requiring dynamic XML rendering?

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  • quering an external oracle db in rails application

    - by railscoder
    I have a website which useses a mysql database for its whole operation . But for a new requirement i need to query a external oracle database( used by other component) and compile a list of items and display in a page in the website. How is it possible to connect to a external database just for rendering a single page. And is it possible to cache the queried result for say 1 month before invalidating the cache and get the updated list of items. i dont want query the external oracle db for each request.

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  • How can I view live MySQL queries?

    - by barfoon
    Hey all, I am just wondering if its possible to trace MySQL queries on my linux server as they happen? For example I'd love to set up some sort of listener, then request a web page and view all of the queries the engine executed, or just view all of the queries being run on a production server. Are there tools to do this? Thank you,

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  • exclude javascript code from print function

    - by user228058
    I have a print function on a page in my website. the problem is, when it hits this line: <script type="text/javascript" src="http://cdn.powerreviews.com/repos/12564/pr/pwr/engine/js/full.js"></script>, it tries to load it, and just never finishes. Any ideas on how to get around that?

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  • ASP.NET - Themes and Relative Referencing

    - by user70192
    Hello, I have an ASP.NET application that uses themes. Let's pretend I have a theme named "MySkin". I have a page that is in a sub-directory of my application. When I reference a page that uses "MySkin", I noticed that ASP.NET renders a link element that walks up to the root of the site and then down into the App_Themes directory. Here is an example link element I found in a rendered ASP.NET page: <link href="../../App_Themes/MySkin/theme.css" type="text/css" rel="stylesheet" /> Is there a reason that the rendered link element does not use the following instead: <link href="/App_Themes/MySkin/theme.css" type="text/css" rel="stylesheet" /> Is this a browser compatibility issue or is there another reason? The reason I am asking is because I am rendering my ASP.NET page using Server.Execute and storing the result in a different directory. Because of this, I would prefer to use the second way to reference my theme's css. Thank you!

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  • How do I add Polylines in gmaps4rails v2

    - by LaraF
    I upgraded to the latest version of gmaps4rails (v2) and am having some issues getting polylines drawing. I can get markers working with the sample code on the wiki, but if I change the addMarkers to addPolylines, nothing renders in the map. Here's the handler code: handler = Gmaps.build('Google'); handler.buildMap({ provider: {}, internal: {id: 'map'}}, function(){ polylines = handler.addPolylines([{"lat":45.678295,"lng":-121.603813,"ele":438.626221,"time":1381851321},{"lat":45.678196,"lng":-121.603607,"ele":423.202148,"time":1381851363},{"lat":45.678181,"lng":-121.603607,"ele":421.108398,"time":1381851373},{"lat":45.678162,"lng":-121.603584,"ele":420.153442,"time":1381851383},{"lat":45.678123,"lng":-121.603569,"ele":422.561096,"time":1381851393},{"lat":45.678165,"lng":-121.6036,"ele":425.191284,"time":1381851403},{"lat":45.678169,"lng":-121.603607,"ele":425.262329,"time":1381851413}]); handler.bounds.extendWith(polylines); handler.fitMapToBounds(); }); No errors in the javascript console, just no map rendering. Any thoughts?

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  • Web Search API for Java

    - by MadSeb
    Hi, I need a Java library for doing web searches ( any search engine is good ). I should be able to to write code such as: WebSearch search = new WebSearch("Apple"); System.Out.Println("Results = " + search.Results.Count); Does such a library/API exist ? Regards, Sebastian

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  • Django admin output extra HTML in ModelSite

    - by VoteyDisciple
    Ultimately, I want to add an <iframe> to the display of a particular model on Django's admin page. Django is already rendering the form for this model correctly, but I want to add this <iframe> in addition to Django's form. The src attribute needs to involve the primary key for the currently-displayed record. I've learned how to properly override the change_form.html template through Django's documentation, and I can add markup to the right block, but I can't figure out how to access the primary key value. (No amount of determined Googling has helped at all.) Alternatively, is there a direct way to specify that I want to produce extra output in my ModelSite definition?

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  • jQuery Validation 1.10 and MVC server-side errors

    - by sam360
    This feature used to work just fine on my website. If I added a custom error to ModelState, the input on the page would be marked as "input-validation-error" and the Html.ValidationMessage() would take care of rendering a span with the error message inside it. Due to incompatibility reasons we had to upgrade our jQuery Validation to 1.10: Now when I add a custom error to ModelState, I can debug and see that the HTML elements being rendered correctly, but as soon as the page load is completed, jQuery Validation removes the error message and set the "class" attribute of the input to "valid"! Has any one else come across this issue? UPDATE Testing further shows that the error message is shown on the screen until the field gains focus. As soon as the field gains focus jQuery Validation removes the customer server-side error message and marks the field as good.

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  • Weird javascript problem...

    - by Silvio Iannone
    Hi there, i'm building a page that is dinamically loaded with ajax. This is what the '$.get' jQuery function calls (this is located on an external HTML page): <script type="text/javascript"> $(function() { $('button').sb_animateButton(); $('input').sb_animateInput(); $('#settings_security_error').hide(); }); function check_passwords(password, password_confirm) { $('#settings_security_error').show(); alert('I\'m in funcion!'); // This works... if(password.length < 4) // ... this doesn't { $('#settings_security_error').innerHTML = 'Password too short'; } else { password = hex_md5(password); password_confirm = hex_md5(password_confirm); $.get('/engine/ajax/check_password.php?password=' + password + '$password_confirm=' + password_confirm, {language: "php", version: 5}, function(result) { $('#settings_security_error').innerHTML = result; }, 'html'); } } </script> <div class="title">Security</div> <table class="sub_container"> <tr> <td><label>Old password</label></td> <td class="td_input"><input type="password" name="old_password"/></td> </tr> <tr> <td><label>New password</label></td> <td class="td_input"><input type="password" name="new_password" id="settings_security_new_password" onkeyup="check_passwords(this.value, getElementById('settings_security_password_confirm').value)"/></td> </tr> <tr> <td><label>Confirm password</label></td> <td class="td_input"><input type="password" name="new_password_confirm" id="settings_security_password_confirm" onkeyup="check_passwords(getElementById('settings_security_new_password').value, this.value)"/></td> </tr> <tr> <td class="td_error" id="settings_security_error"></td> </tr> </table> And this is where the external HTML is placed...: <div id="settings_appearance"> </div> ... from this javascript snippet: function get_page_content(page, target_id) { $.get('engine/ajax/get_page_content.php?page=' + page, null, function(result) { $("#"+target_id).html(result); // Or whatever you need to insert the result }, 'html'); } Well... the problem is that the javascript in the first snippet is executed when it's loaded by the $.get function, but i still can't understand the reason why when i type into the input boxes nothing happen. It should write the output of the javascript function check_passwords(password, password_confirm) in <td class="td_error" id="settings_security_error"></td>. Thanks for helping. Silvio

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  • Loading textures in an Android OpenGL ES App.

    - by Omega
    I was wondering if anyone could advise on a good pattern for loading textures in an Android Java & OpenGL ES app. My first concern is determining how many texture names to allocate and how I can efficiently go about doing this prior to rendering my vertices. My second concern is in loading the textures, I have to infer the texture to be loaded based on my game data. This means I'll be playing around with strings, which I understand is something I really shouldn't be doing in my GL thread. Overall I understand what's happening when loading textures, I just want to get the best lifecycle out of it. Are there any other things I should be considering?

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  • Flex datagrid - determining when grid has completed renderering?

    - by ccdugga
    hi, i have a datagrid which contains a number of itemrenderers, it is populated each time a user does a search. Is there an event which can tell me when the datagrid has completed rendering all new rows and item renderers? I need to trigger an event once everything has been created so that i can resize then container which holds the grid. Currently im using DataGridEvent.HEADER_RELEASE and CollectionEvent.COLLECTION_CHANGE events to manage this however the problem with these events is that they get called as each new row is being added to the datagrid. therefore the whole process is becoming sluggish. Does anyone have any suggestions?

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  • iframe for ad loading good or bad?

    - by Cedar Jensen
    According to Yahoo's "Best Practices for Speeding Up your Site", the pros for using iframes: Helps with slow third-party content like badges and ads Download scripts in parallel but the cons are: Costly even if blank Blocks page onload I want to use an iframe to load ads using the technique mentioned on this site: http://meanderingpassage.com/2007/08/15/keeping-javascript-widgets-from-controlling-your-blog/ Does using this technique mean that as soon as the html contents requested by the iframe are returned to the client, it will load the ad script, potentially blocking the rest of the page's rendering and downloading? Or will the iframe request get processed concurrently while rest of the document is downloaded and rendered?

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  • Enabling depth testing when using CAOpenGLLayer

    - by Andrew
    If one is using a subclass of NSOpenGLView then one enables depth testing by selecting a 16/24/32 bit buffer from the attributes menu in Xcode, and then adding glEnable(GL_DEPTH_TEST); glClear(GL_DEPTH_BUFFER_BIT); to the drawRect method. However, in the application I'm creating I'm rendering OpenGL content via the drawInCGLContext method of a CAOpenGLLayer which is contained within a subclass of NSView. This means that it is no longer possible to create a depth buffer via the inspector. Does anyone know how I can achieve this in such a situation?

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  • defining arrays in smarty via config files

    - by quardas
    Is it possible to defining arrays in config files in smarty?? for example I want have small data base in config file (located in /configs) - few (about 20) products descriptions: title, price, description. After that I want to list it via foreach or section. How can I define that array in Smarty without MySql or other db engine. Can I do that?

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  • Most efficient algorithm for mesh-level, optimal occlusion culling?

    - by Fredriku73
    I am new to culling. On a first glance, it seems that most occlusion culling algorithms are object-level, not examining single meshes, which would be practical for game rendering. What I am looking for is an algorithm that culls all meshes within a single object that are occluded for a given viewpoint, with high accuracy. It needs to be at least O(n log n), a naive mesh-by-mesh comparison (O(n^2)) is too slow. I notice that the Blender GUI identifies the occluded meshes for you in real-time, even if you work with large objects of 10,000+ meshes. What algorithm is used there, pray tell?

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  • How do I manage report paging in HTML?

    - by ProfK
    I have a small, custom crafted HTML report, not using any reporting engine, for various reasons. The client's layout is quite handy, as each report section fits on its own page, so I have one div for each page, with a CSS class of .page, setting A4 dimensions with margin, and a header image. Each 'page' also has a small header table just under the header image, and a section heading label. Now, some sections threaten to overflow their page, and I'm looking at ways to handle this. One clumsy approach is to include a second page for those sections that might overflow, and delete these pages before rendering if they are empty. If I do this, how can I 'tell' content on one page to overflow into the next page? The report is finished and a once off effort, so I'm not keen to convert it into a SSRS or Telerik report just to achieve this paging.

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  • WPF: Turning off animations, data binding temporarly for invisible objects?;)

    - by TomTom
    I have a window that contains a tab control - basically multiple sheets with visualizations on them. The visualtizations are: possible very resource intensive during rendering relying on constant data updates to update their underlying models Obviously only one sheet can be visible every time ;) Anyone knows of a good way to turn off all visualization, animations, data binding for a control / panel and it's contained controls? If I would find a way to do that, I could simply turn off all the invisible sheets and reactivate them as needed. The models must be kept running - some of the visual stuff is pretty complex and really relies on constant data updates, and recalculating it when someone switches tabs would be too hard.

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  • HyperLinks In GridView

    - by Hany
    I am working on C# application and I am trying to do the following: my project is like a small search Engine The user will enter a word and The Program should return the Files that contains this word my Question is: I have an array of File paths(the path is a normal string) I want to show this paths like a links in a Gridview so when the user click the file name the file will be opened Notice: I am working on C# forms Not ASP.net

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  • Support both Standard mode and Quirks mode? Is that possible and necessary?

    - by tshao
    Today I was assigned a bug saying that some page elements don't work on IE8 Quirks mode at all, and I need to fix them. The point is that I believe our pages will always be rendered in Standard mode, because we specify DOCTYPE at the beginning of every page (via master page). I'd think it must be some debugging tools changed that during testing. I managed to convice QA to close it as by design, after a brief explanation to her. Now I start to think the question that whether we should have our page work on both Standard and Quirks mode. Maybe we should try to minimize the problem even if the page is not rendering in a supposed mode? Any standard or best practices on that? Thanks!

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