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• OpenGL ES canvas size

  - by Chaoz

  Ahoy, I'm working on an OpenGL ES based game for Android using the NDK. My application is targeted towards SDK 1.6 and above. I seem to be having a problem creating a canvas of the phones native size. My rendering is done through a native gameloop that uses OpenGL 1.0. I'm using the emulator and that gives me a 480x320 canvas -- this is totally fine. Then, when I run the same application on my HTC Desire which has a native resolution of 800x480 I'm getting a canvas of 533x320. Anyone have any information on how to deal with/solve this? Any other information about this is also appreciated. Thanks in advance!

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• Anyone up to creating a tomcat based alternative for GAE?

  - by bach

  Hi, If we had the possibility to run GAE app without any code change on our servlet engine that would be great because: in case that google changes their billing policy we can just jump to our own server or in case their current policy doesn't fit our app needs we can do stuff which is not allowed in the GAE, compromising a 1 JVM, 1 DB We don't actually need a distributed system but more of a realtime system with synchronize, true locking mechanisms, other servers/software installed on the server machine, socket interface etc... Such a package should include at least: TomCat (or equivalent) DataNucleus Access Platform (Task Queue service) Any idea if it's easy to get such a thing or if it's already exist somewhere? Thanks

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• how to get obj2.name via obj1.categories(), thanks (gae python)

  - by zjm1126

  i using google-app-engine webapp ,code is : class Post(db.Model): title = db.StringProperty(required=True) def categories(self): return (x.category for x in self.postcategory_set) class Category(db.Model): name = db.StringProperty() class PostCategory(db.Model): post = db.ReferenceProperty(Post) category = db.ReferenceProperty(Category) class sss(webapp.RequestHandler): def get(self): obj1 = Post(title='hhaa') #obj1.title = 'haha' obj1.put() obj2 = Category() obj2.name='haha-kao' obj2.put() obj3=PostCategory() obj3.post=obj1 obj3.category=obj2 obj3.put() self.response.out.write(obj1.categories().get().name) the error is : Traceback (most recent call last): File "D:\Program Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 511, in __call__ handler.get(*groups) File "D:\zjm_code\helloworld\a.py", line 131, in get self.response.out.write(obj1.categories().get().name) AttributeError: 'generator' object has no attribute 'get' so how to get the obj2.name via obj1's method thanks

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• Restfull authentication between two GAE apps.

  - by user259349

  Hello everyone, i am trying to write a restful google app engine application (python) that accepts requests only from another GAE that i wrote. I dont like any of the ways that i thought of to get this done, please advice if you know of something better than: Get SSL setup, and simply add the credentials on the request that my consuming app will send. I dont like it cause SSL will slow things down. Security by obsecurity. Pass a long number by my consuming app that is in Xmod0, where X is a secret number that both applications know. I just,,,, dont like this. Check the HTTP header to see where is the request coming from. This option is the one that i hate the least, not alot of processing, and spoofing an HTTP request is not really worth it, for my application's data. Is there any other clean solution for this?

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• How do i make my google web app searchable on google?

  - by LoudNPossiblyRight

  I have started to develop a web app on google's app engine and i wish to make the static content on the site searchable on google. For example, my app is at http://ajakimov.appspot.com/ and on it there is only some random text like 'form bell road smear sky orange fan glass key'. When i google for 'form bell road smear' for example or the title of the site for that matter , i get no results - cant find the site. Does anyone know how to make a appengine site google-able? Thanks.

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• How to think in data stores instead of databases?

  - by Jim

  As an example, Google App Engine uses data stores, not a database, to store data. Does anybody have any tips for using data stores instead of databases? It seems I've trained my mind to think 100% in object relationships that map directly to table structures, and now it's hard to see anything differently. I can understand some of the benefits of data stores (e.g. performance and the ability to distribute data), but some good database functionality is sacrificed (e.g. joins). Does anybody who has worked with data stores like BigTable have any good advice to working with them?

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• SEO with image link alt text vs standard text-based link

  - by Infiniti Fizz

  Hi, I'm currently developing a website and the main navigation is made up of image links because the font used for them isn't standard. My client's only worry is will this mess up search engine optimization? Can I just add alt text to the images like "link 1" or use the name attribute of the anchor tag? Or would it be better to just have the navigation as anchor tags with the names of the links in them like: <a href="...">link 1</a>? I'm new to SEO so really don't know which to suggest to him, Thanks for your time, InfinitiFizz

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• java.lang.NoClassDefFoundError: com/google/appengine/tools/enhancer/Enhance

  - by user1204337

  I am new to GAE, I follow the instructions on http://code.google.com/eclipse/docs/install-eclipse-3.7.html. I got the installation and registration done pretty fast. But when I tried to build the helloWorld project in Eclipse, before I can do anything, Eclipse gives me an error says "java.lang.NoClassDefFoundError: com/google/appengine/tools/enhancer/Enhance" and it is very weird. Because when you expand the app engine sdk, you can easily find the Enhance class under related jar file. I also tried Enhance e = null; and it is working. It seems that my eclipse just cannot find it. I don't know why it is not working, I am using JDK1.6, I reinstall my eclipse and the google plugins, I even disabled my firewall. Please help!!!

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• GAE/J: unable to register a custom ELResolver

  - by dfa

  I need to register a custom ELResolver for a Google App Engine project. Since it must be registered before any request is received, as specified by the Javadoc: It is illegal to register an ELResolver after the application has received any request from the client. If an attempt is made to register an ELResolver after that time, an IllegalStateException is thrown. I'm using a ServletContextListener: public class RegisterCustomELResolver implements ServletContextListener { @Override public void contextInitialized(ServletContextEvent sce) { ServletContext context = sce.getServletContext(); JspApplicationContext jspContext = JspFactory.getDefaultFactory().getJspApplicationContext(context); jspContext.addELResolver(new MyELResolver()); } ... } The problem is that JspFactory.getDefaultFactory() returns always null. I've alreay filled a bug report. Any idea for a workaround?

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• Drawing reflexive edges in State Machines

  - by reforged

  I have to draw a small finite state machine that has some reflexive transitions (meaning the start and the end state of the transition are equal. The problem is that rendering that in Graphviz has ugly results. digraph finite_state_machine { edge [fontsize=11]; S0 - S0 [label = "td=1\n-/e2"]; S0 - S1 [label = "td=3 \n-/e3" ]; S1 - S0 [label = "td=3\n-/-\nt=0"]; S0 - S2 [label = "P:i1/e4"]; S2 - S0 [label = "td=0\n-/-" ]; S0 - S0 [label = "i1/e1\ntd+=1"]; } Is there a way to make this look a little better? BTW: I tried head/tailport but they don't work on my version of Graphviz (1.13 on Mac OS X) I am not limited to the dot engine, I only want a nice looking graph and don't care about the renderer/language. Thanks a lot

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• Bilinear interpolation - DirectX vs. GDI+

  - by holtavolt

  I have a C# app for which I've written GDI+ code that uses Bitmap/TextureBrush rendering to present 2D images, which can have various image processing functions applied. This code is a new path in an application that mimics existing DX9 code, and they share a common library to perform all vector and matrix (e.g. ViewToWorld/WorldToView) operations. My test bed consists of DX9 output images that I compare against the output of the new GDI+ code. A simple test case that renders to a viewport that matches the Bitmap dimensions (i.e. no zoom or pan) does match pixel-perfect (no binary diff) - but as soon as the image is zoomed up (magnified), I get very minor differences in 5-10% of the pixels. The magnitude of the difference is 1 (occasionally 2)/256. I suspect this is due to interpolation differences. Question: For a DX9 ortho projection (and identity world space), with a camera perpendicular and centered on a textured quad, is it reasonable to expect DirectX.Direct3D.TextureFilter.Linear to generate identical output to a GDI+ TextureBrush filled rectangle/polygon when using the System.Drawing.Drawing2D.InterpolationMode.Bilinear setting? For this (magnification) case, the DX9 code is using this (MinFilter,MipFilter set similarly): Device.SetSamplerState(0, SamplerStageStates.MagFilter, (int)TextureFilter.Linear); and the GDI+ path is using: g.InterpolationMode = InterpolationMode.Bilinear; I thought that "Bilinear Interpolation" was a fairly specific filter definition, but then I noticed that there is another option in GDI+ for "HighQualityBilinear" (which I've tried, with no difference - which makes sense given the description of "added prefiltering for shrinking") Followup Question: Is it reasonable to expect pixel-perfect output matching between DirectX and GDI+ (assuming all external coordinates passed in are equal)? If not, why not? Finally, there are a number of other APIs I could be using (Direct2D, WPF, GDI, etc.) - and this question generally applies to comparing the output of "equivalent" bilinear interpolated output images across any two of these. Thanks!

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• DataNucleus Enhancer flakey?

  - by KevMo

  I'm creating a GWT app in Google App Engine, and using Google data store. Does anybody else have the problem of the DataNucleus being flakey as all get out? I can save a class, and DataNucleus will do it's thing just fine. If I change ANYTHING in the class (even adding whitespace) and then save, I get the following error: DataNucleus Enhancer completed with success for 0 classes. Timings : input=37 ms, enhance=0 ms, total=37 ms. Consult the log for full details DataNucleus Enhancer completed and no classes were enhanced. Consult the log for full details Once I clean my project, DataNucleus is happy again. Is this common when using eclipse? Is there a workaround?

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• v8 is too slow for my purpose

  - by Scott

  I'm working on a music visualization plugin for libvisual. It's an AVS clone -- AVS being from Winamp. Right now I have a superscope plugin. This element has 4 scripts, and "point" is run at every pixel. You can imagine that it has to be rather fast. The original libvisual avs clone had a JIT compiler that was really fast, but it had some bugs and wasn't fully implemented, so I decided to try v8. Well, v8 is too slow running the compiled script at every pixel. Is there any other script engine that would be pretty fast for this purpose?

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• Need guidelines for optimizing WebGL performance by minimizing shader changes

  - by brainjam

  I'm trying to get an idea of the practicality of WebGL for rendering large architectural interior scenes, consisting of 100K's of triangles. These triangles are distributed over many objects, and there are many materials in the scene. On the other hand, there are no moving parts. And the materials tend to be fairly simple, mostly based on texture maps. There is a lot of texture map sharing .. for example all the chairs in scene will share a common map. There is also some multitexturing - up to three textures overlaid in a material. I've been doing a little experimentation and reading, and gather that frequently switching materials during a rendering pass will slow things down. For example, a scene with 200K triangles will have significant performance differences, depending on whether there are 10 or 1000 objects, assuming that each time an object is displayed a new material is set up. So it seems that if performance is important the scene should be sorted by materials so as to minimize material switching. What I'm looking for is guidelines on how to think of the overhead of various state changes, and where do I get the biggest bang for the buck. For example, what are the relative performance costs of, say, gl.useProgram(), gl.uniformMatrix4fv(), gl.drawElements() should I try to write ubershaders to minimize shader switching? should I try to aggregate geometry to minimize the number of gl.drawElements() calls I realize that mileage may vary depending on browser, OS, and graphics hardware. And I'm also not looking for heroic measures. Just some guidelines from people who have already had some experience in making scenes fast. I'll add that while I've had some experience with fixed-pipeline OpenGL programming in the past, I'm rather new to the WebGL/OpenGL ES 2.0 way of doing things.

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• Good way to make Authentication and Authorization information available between application layers

  - by DutrowLLC

  I have a web application running on Google App Engine (GAE) for JAVA. I'm authenticating the client at the Servlet layer but would like to make the client information available to my business and data layers without having to pass the client object through the arguments of every single function. I'm considering setting up a "session" type object using ThreadLocal. That way any function can just say something like: CurrentUser.getRoles(); Is this a good way to do this or is there something else that is a more accepted solution? Thanks!

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• Tag/Keyword based recommendation

  - by Hellnar

  Hello I am wondering what algorithm would be clever to use for a tag driven e-commerce enviroment: Each item has several tags. IE: Item name: "Metallica - Black Album CD", Tags: "metallica", "black-album", "rock", "music" Each user has several tags and friends(other users) bound to them. IE: Username: "testguy", Interests: "python", "rock", "metal", "computer-science" Friends: "testguy2", "testguy3" I need to generate recommendations to such users by checking their interest tags and generating recommendations in a sophisticated way. Ideas: A Hybrid recommendation algorithm can be used as each user has friends.(mixture of collaborative + context based recommendations). Maybe using user tags, similar users (peers) can be found to generate recommendations. Maybe directly matching tags between users and items via tags. Any suggestion is welcome. Any python based library is also welcome as I will be doing this experimental engine on python language.

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• Spring - Redirect after POST (even with validation errors)

  - by Taylor L

  I'm trying to figure out how to "preserve" the BindingResult so it can be used in a subsequent GET via the Spring <form:errors> tag. The reason I want to do this is because of Google App Engine's SSL limitations. I have a form which is displayed via HTTP and the post is to an HTTPS URL. If I only forward rather than redirect then the user would see the https://whatever.appspot.com/my/form URL. I'm trying to avoid this. Any ideas how to approach this? Below is what I'd like to do, but I only see validation errors when I use return "create". @RequestMapping(value = "/submit", method = RequestMethod.POST) public final String submit( @ModelAttribute("register") @Valid final Register register, final BindingResult binding) { if (binding.hasErrors()) { return "redirect:/register/create"; } return "redirect:/register/success"; }

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• How to handle security constraints using GWT 2.1's RequestFactory?

  - by Marc

  I am currently developing a GWT 2.1 application that is to be deployed on Google App Engine. I would like to realise the server communication using the new RequestFactory. Now my question is how to handle fine-grained security issues in this context? Some server actions (of those declared in the RequestContext stubs) shall be restricted to certain users (possibly depending on the parameters of the remote call). If a call is unauthorised, I would like the client to show a login page (so that one may log in as a different user, for example). From the Expenses example, I know how to implement an automatic redirection to a login page, but in this example, the security model is quite simple: A client is allowed to access the servlet if and only if a user is logged in. Shall I raise a custom UnAuthorizedException in my server-side service? Where should I intercept this exception? (Can I do this in a servlet filter like the GaeAuthFilter of the Expenses example?)

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• Why is only the suffix of work_index hashed?

  - by Jaroslav Záruba

  I'm reading through the PDF that Brett Slatkin has published for Google I/O 2010: "Data pipelines with Google App Engine": http://tinyurl.com/3523mej In the video (the Fan-in part) Brett says that the work_index has to be a hash, so that 'you distribute the load across the BigTable': http://www.youtube.com/watch?v=zSDC_TU7rtc#t=48m44 ...and this is how work_index is created: work_index = '%s-%d' % (sum_name, knuth_hash(index)) ...which I guess creates something like 'mySum-54657651321987' I do understand the basic idea, but is why only one half of work_index is hashed? Is it important to hash only part of it leaving the suffix out? Would it be wrong to do md5('%s-%d' % (sum_name, index)) so that the hash would be like '6gw8....hq6' ? I'm Java guy so I would use md5 to hash, which means I get id like 'mySum' + 32 characters. (Obviously I want my ids/keys to be as short as possible here.) If I could hash the whole string my id would be just 32 chars. Or would you suggest to use something else to do the hashing with?

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• Java3d resetting to a new scene

  - by Dan Howard

  Hi all, I'm working on a game in Java3D. I read all my level info from a file and it works fine. But now I want to re-initialize the scene from reading data from a different file. How do I reset the scene? Should I just destroy the whole canvas3D and universe objects?

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• C++ HTML template framework, templatizing library, HTML generator library

  - by Marcin Gil

  I am looking for template/generator libraries for C++ that are similar to eg. Ruby's Erb, Haml, PHP's Smarty, etc. It would be great if I it would sport some basic features like loops, if/else, int conversion to strings, etc. Parameter passing to template rendering engine is also important if I could pass all of them in a hash map instead of calling some function for each of parameters. Do you have any recommendations? I can see also the possibility of embedding languages like Lua, however I haven't found a templatizing library for that either. Thanks!

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• Flipping issue when interpolating Rotations using Quaternions

  - by uhuu

  I use slerp to interpolate between two quaternions representing rotations. The resulting rotation is then extracted as Euler angles to be fed into a graphics lib. This kind of works, but I have the following problem; when rotating around two (one works just fine) axes in the direction of the green arrow as shown in the left frame here the rotation soon jumps around to rotate from the opposite site to the opposite visual direction, as indicated by the red arrow in the right frame. This may be logical from a mathematical perspective (although not to me), but it is undesired. How could I achieve an interpolation with no visual flipping and changing of directions when rotating around more than one axis, following the green arrow at all times until the interpolation is complete? Thanks in advance.

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• Which jsPerf-test should I consider as standard for checking the performance of javascript template-engines

  - by bhargav

  I am on a search for a javascript template engine that has good performance when used in large js applications and is also very suitable for mobile applications. So I have gone through the various jsPerf-tests for these. There seems to be a lot which show different results and it is confusing to find out which is the standard test. Can some one guide me a standard jsPerf that I can refer to and that should also include following templates dust, underscore, hogan, mustache, handlebars. From what I have observed dot.js is a constant performer with good rendering speed, but is it mature enough for larger applications ? What is this "with" and "no with" that is shown in the jspref tests? Can some one explain. In all the tests I have seen popular templates like mustache, handlebars, dust, hogan,etc seems to be behind performance than other templates, so why people are using them leaving out the top performers,is it because of maturity of these template engines? Thanks in advance

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• How to setup/calculate texturebuffer in glTexCoordPointer when importing from OBJ-file

  - by JohnMurdoch

  Hi all, I'm parsing an OBJ-file in Android and my goal is to render & display the object. Everything works fine except the correct texture mapping (importing the resource/image into opengl etc works fine). I don't know how to populate the texture related data from the obj-file into an texturebuffer-object. In the OBJ-file I've vt-lines: vt 0.495011 0.389417 vt 0.500686 0.561346 and face-lines: f 127/73/62 98/72/62 125/75/62 My draw-routine looks like (only relevant parts): gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glEnableClientState(GL10.GL_NORMAL_ARRAY); gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer); gl.glNormalPointer(GL10.GL_FLOAT, 0, normalsBuffer); gl.glTexCoordPointer(2, GL10.GL_SHORT, 0, t.getvtBuffer()); gl.glDrawElements(GL10.GL_TRIANGLES, t.getFacesCount(), GL10.GL_UNSIGNED_SHORT, t.getFaceBuffer()); Output of the counts of the OBJ-file: Vertex-count: 1023 Vns-count: 1752 Vts-count: 524 ///////////////////////// Part 0 Material name:default Number of faces:2037 Number of vnPointers:2037 Number of vtPointers:2037 Any advise is welcome.

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• How to write data by dynamic parameter name

  - by Maxim Welikobratov

  I need to be able to write data to datastore of google-app-engine for some known entity. But I don't want write assignment code for each parameter of the entity. I meen, I don't want do like this val_1 = self.request.get('prop_1') val_2 = self.request.get('prop_2') ... val_N = self.request.get('prop_N') item.prop_1 = val_1 item.prop_2 = val_2 ... item.prop_N = val_N item.put() instead, I want to do something like this args = self.request.arguments() for prop_name in args: item.set(prop_name, self.request.get(prop_name)) item.put() dose anybody know how to do this trick?

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