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  • Questions before I revamp my rendering engine to use shaders (GLSL)

    - by stephelton
    I've written a fairly robust rendering engine using OpenGL ES 1.1 (fixed-function.) I've been looking into revamping the engine to use OpenGL ES 2.0, which necessitates that I use shaders. I've been absorbing information all day long and still have some questions. Firstly, lighting. The fixed-function pipeline is guaranteed to have at least 8 lights available. My current engine finds lights that are "close" to the primitives being drawn and enables them; I don't know how many lights are going to be enabled until I draw a given model. Nothing is dynamically allocated in GLSL, so I have to define in a shader some number of lights to be used, right? So if I want to stick with 8, should I write my general purpose shader to have 8 lights and then use uniforms to tell it how many / which lights to use? Which brings me to another question: should I be concerned with the amount of data I'm allocating in a shader? Recent video cards have hundreds of "stream processors." If I've got a fragment shader being used on some number of fragments in a given triangle, I assume they must each have their own stack to work on. Are read-only variables copied here, or read when needed? My initial goal is to rework my code so that it is virtually identical to the current implementation. What I have in mind is to create my own matrix stack so that I can implement something along the lines of push/popMatrix and apply all my translations, rotations, and scales to this matrix, then provide the matrix to the vertex shader so that it can make very quick vertex translations. Is this approach sound? Edit: My original intention was to ask if there was a tutorial that would explain the bare minimum necessary to jump from fixed-function to using shaders. Thanks!

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  • What is a good way to share internal helpers?

    - by toplel32
    All my projects share the same base library that I have build up over quite some time. It contains utilities and static helper classes to assist them where .NET doesn't exactly offer what I want. Originally all the helpers were written mainly to serve an internal purpose and it has to stay that way, but sometimes they prove very useful to other assemblies. Now making them public in a reliable way is more complicated than most would think, for example all methods that assume nullable types must now contain argument checking while not charging internal utilities with the price of doing so. The price might be negligible, but it is far from right. While refactoring, I have revised this case multiple times and I've come up with the following solutions so far: Have an internal and public class for each helper The internal class contains the actual code while the public class serves as an access point which does argument checking. Cons: The internal class requires a prefix to avoid ambiguity (the best presentation should be reserved for public types) It isn't possible to discriminate methods that don't need argument checking   Have one class that contains both internal and public members (as conventionally implemented in .NET framework). At first, this might sound like the best possible solution, but it has the same first unpleasant con as solution 1. Cons: Internal methods require a prefix to avoid ambiguity   Have an internal class which is implemented by the public class that overrides any members that require argument checking. Cons: Is non-static, atleast one instantiation is required. This doesn't really fit into the helper class idea, since it generally consists of independent fragments of code, it should not require instantiation. Non-static methods are also slower by a negligible degree, which doesn't really justify this option either. There is one general and unavoidable consequence, alot of maintenance is necessary because every internal member will require a public counterpart. A note on solution 1: The first consequence can be avoided by putting both classes in different namespaces, for example you can have the real helper in the root namespace and the public helper in a namespace called "Helpers".

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  • Views : ViewControllers, many to one, or one to one?

    - by conor
    I have developed an Android application where, typically, each view (layout.xml) displayed on the screen has it's own corresponding fragment (for the purpose of this question I may refer to this as a ViewController). These views and Fragments/ViewControllers are appropriately named to reflect what they display. So this has the effect of allowing the programmer to easily pinpoint the files associated with what they see on any given screen. The above refers to the one to one part of my question. Please note that with the above there are a few exceptions where very similar is displayed on two views so the ViewController is used for two views. (Using a simple switch (type) to determine what layout.xml file to load) On the flip side. I am currently working on the iOS version of the same app, which I didn't develop. It seems that they are adopting more of a one-to-many (ViewController:View) approach. There appears to be one ViewController that handles the display logic for many different types of views. In the ViewController are an assortment of boolean flags and arrays of data (to be displayed) that are used to determine what view to load and how to display it. This seems very cumbersome to me and coupled with no comments/ambiguous variable names I am finding it very difficult to implement changes into the project. What do you guys think of the two approaches? Which one would you prefer? I'm really considering putting in some extra time at work to refactor the iOS into a more 1:1 oriented approach. My reasoning for 1:1 over M:1 is that of modularity and legibility. After all, don't some people measure the quality of code based on how easy it is for another developer to pick up the reigns or how easy it is to pull a piece of code and use it somewhere else?

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  • Fourth texture = segmentation fault

    - by Robin92
    I keep on getting segmentation fault each time I load fourth texture - what type of texture, I mean filename, does not matter. I checked value of GL_TEXTURES_STACK_SIZE which turned out to be 10 so quite more than 4, isn't it? Here're code fragments: funciton to load texture from png static GLuint gl_loadTexture(const char filename[]) { static int iTexNum = 1; GLuint texture = 0; img_s *img = NULL; img = img_loadPNG(filename); if (img) { glGenTextures(iTexNum++, &texture); glBindTexture(GL_TEXTURE_2D, texture); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, img->iGlFormat, img->uiWidth, img->uiHeight, 0, img->iGlFormat, GL_UNSIGNED_BYTE, img->p_ubaData); img_free(img); //it may cause errors on windows } else printf("Error: loading texture '%s' failed!\n", filename); return texture; } actual loading static GLuint textures[4]; static void gl_init() { (...) //setting up OpenGL /* loading textures */ textures[0] = gl_loadTexture("images/background.png"); textures[1] = gl_loadTexture("images/spaceship.png"); textures[2] = gl_loadTexture("images/asteroid.png"); textures[3] = gl_loadTexture("images/asteroid2.png"); //this is causing SegFault no matter which file I load! } Any ideas? Problem is present on both Linux and Windows.

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  • Notification framework for java

    - by rmarimon
    I'm in the process of developing a web application (java + jsp) that can send notifications to users. The user can subscribe to multiple events generated by the application and can choose to receive the messages associated with those events via multiple channels (email, sms, growl?, messenger); perhaps different messages through different channels; perhaps a daily message digest. Everything must be configurable by the user. Is there some framework that deals with this?

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  • Spring validation @AssertTrue

    - by Eqbal
    How do I display on a view jsp validation error message that occurs as a result of @AssertTrue annotation? It isn't tied to a specific field, but I am using it to validate a combination of fields. If I use <form:errors path="*"/> that will display all the errors for that form?

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  • Error when updating BlackBerry JDE Plug-in for Eclipse (v5.0 Beta 3) ?

    - by Ashraf Bashir
    I tried to update Blackberry JDE plug-in for eclipse from v4.5 to v5.0 Beta 3. I followed the instructions in this page: http://na.blackberry.com/eng/developers/devbetasoftware/updatesite.jsp but unfortunately I got the following error while updating: An error occurred while collecting items to be installed. No repository found containing: net.rim.eide.feature.componentpack5.0.0/org.eclipse.update.feature/5.0.0.14 How this could be solved ? Any suggestions ?

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  • Coldfusion popularity

    - by jrharshath
    Hi, I've heard of Coldfusion being a server side technology for web app dev. Are there any statistics as to how widely it is used as opposed to PHP, Java Servlets and JSP or ASP.NET? Are there any special features in coldfusion that make learning it worth the while? Thanks, jrh PS: please don't close this question as argumentative. I'm looking for statistics and real answers. Thanks for understanding.

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  • how to get mysql query as xml?

    - by mobibob
    I recall reading about XML support from MySql. Does anyone know how to get XML without writing code? My client-protocol expects XML and I have a data source that I can access from a web app (JSP using JDBC).

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  • Get list of authenticated users in glassfish

    - by KevMo
    Is it possible to get a list of all the currently logged in users in an application running on glassfish? I'm user container managed authentication, so I know the information is somewhere. I would like to display this information on my own JSP page as opposed to finding it in the admin console, but either will work fine.

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  • RTF formatting in jasper reports

    - by ed1t
    I have a report which I generate RTF format off that. It displays fine on the jsp page or in the ireports preview but when it generates the RFT format, it gives me the "Invalid text height" error. I have no idea which field is causing this error, is there a way in ireports to drill down exactly which field is causing it?

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  • IE 7 crashes with style position relative

    - by prakash
    Hi All, Below link code causing IE 7 to Crash when link is clicked , when googled it is saying there is bug in IE 7 DO there is any work around for this ? <a title="FAQ" style="position:relative;right:235px;top:-55px;" target="_blank" href="http://www.Google.com/ccp/index.jsp?pg_name=shared/help/page/Somahlep_FAQ_hwtp">READ OUR FAQS</a>

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  • Tomcat to Glassfish url

    - by Argiropoulos Stavros
    Let's say I have a Tomcat and a web application on it with index.html is in catalina_home\webapps\ROOT\index1.html and this web application runs successfully to the internet. Also I have a glassfish with another application deployed on it with let's say an index2.jsp. Can I have a link in index1 that can open index2?

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  • Rendering HTML in Java

    - by ferronrsmith
    I am trying to create a help panel for an application I am working on. The help file as already been created using html technology and I would like it to be rendered in a pane and shown. All the code I have seen shows how to render a site e.g. "http://google.com". I want to render a file from my pc e.g. "file://c:\tutorial.html" This is the code i have, but it doesn't seem to be working. import javax.swing.JEditorPane; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.SwingUtilities; import java.awt.Color; import java.awt.Container; import java.io.IOException; import static java.lang.System.err; import static java.lang.System.out; final class TestHTMLRendering { // ------------------------------ CONSTANTS ------------------------------ /** * height of frame in pixels */ private static final int height = 1000; /** * width of frame in pixels */ private static final int width = 1000; private static final String RELEASE_DATE = "2007-10-04"; /** * title for frame */ private static final String TITLE_STRING = "HTML Rendering"; /** * URL of page we want to display */ private static final String URL = "file://C:\\print.html"; /** * program version */ private static final String VERSION_STRING = "1.0"; // --------------------------- main() method --------------------------- /** * Debugging harness for a JFrame * * @param args command line arguments are ignored. */ @SuppressWarnings( { "UnusedParameters" } ) public static void main( String args[] ) { // Invoke the run method on the Swing event dispatch thread // Sun now recommends you call ALL your GUI methods on the Swing // event thread, even the initial setup. // Could also use invokeAndWait and catch exceptions SwingUtilities.invokeLater( new Runnable() { /** * } fire up a JFrame on the Swing thread */ public void run() { out.println( "Starting" ); final JFrame jframe = new JFrame( TITLE_STRING + " " + VERSION_STRING ); Container contentPane = jframe.getContentPane(); jframe.setSize( width, height ); contentPane.setBackground( Color.YELLOW ); contentPane.setForeground( Color.BLUE ); jframe.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); try { out.println( "acquiring URL" ); JEditorPane jep = new JEditorPane( URL ); out.println( "URL acquired" ); JScrollPane jsp = new JScrollPane( jep, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED ); contentPane.add( jsp ); } catch ( IOException e ) { err.println( "can't find URL" ); contentPane.add( new JLabel( "can't find URL" ) ); } jframe.validate(); jframe.setVisible( true ); // Shows page, with HTML comments erroneously displayed. // The links are not clickable. } } ); }// end main }// end TestHTMLRendering

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  • SASS implementation for Java?

    - by cofko
    I'm looking for SASS implementation in Java (could be used with JSP/JSF). For Python I've found CleverCSS, but there is nothing for Java. Anyone heard something about this sort of tool for generating CSS?

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  • How to distribute java components for developers to use?

    - by coder
    I am not sure how to put the correct title. but here is the brief explanation. With Microsoft .NET, i created a server side custom control using C# to be used in ASP.NET pages. I distribute the DLL generated as a component. developers will include that and use in their ASP.NET project. Likewise, how can i do for Java based web components for to use with JSP or JSF or any other java web frameworks?

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  • Customer Support Identifier-How to get this?

    - by megala
    I was trying to create an account in this site which gives you complete functional implementation of the Oracle Applications 11i ( http://vis11510.solutionbeacon.net/OA_HTML/AppsLocalLogin.jsp?requestUrl=APPSHOMEPAGE&cancelUrl=http%3A%2F%2Fvis11510.solutionbeacon.net%3A80%2Foa_servlets%2Foracle.apps.fnd.sso.AppsLogin ) . The site asks me to provide Oracle CSI (Customer Support Identifier) any idea how i can obtain one?

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  • Why html frame behave differently in Firefox and IE8 ?

    - by Frank
    I use html frame on my webiste, it's been running for I while, usually I only use Firefox to surf the net, my site looks and functions ok, but today I suddenly found IE8 has a problem with the frame on my site, if I click on the top menu items, it's supposed to display the content in the lower part of the frame, it does this correctly in Firefox, but in IE8, it displays the content in the upper part of the frame and replaces the menu items. In order to give more details, I'll include a simplified version of my html pages, at the top level there are two items, an index.html page and a file directory, all the pages except the index.html are in the directory, so it looks like this : index.html Dir_Docs 00_Home.html 00_Install_Java.html 00_Top_Menu.html 01_Home_Menu.html 01_Install_Java_Menu.html 10_Home_Welcome.html 10_How_To_Install_Java.html [ index.html ] <Html> <Head><Title>Java Applications : Tv_Panel, Java_Sound, Biz Manager and Web Academy</Title></Head> <Frameset Rows="36,*" Border=5 Bordercolor=#006B9F> <Frame Src=Dir_Docs/00_Top_Menu.html Frameborder=YES Scrolling=no Marginheight=1 Marginwidth=1> <Frame Src=Dir_Docs/00_Home.html Name=lower_frame Marginheight=1 Marginwidth=1> </Frameset> </Html> [ 00_Home.html ] <Html> <Head><Title>NMJava Application Development</Title></Head> <Frameset Cols="217,*" Align=center BorderColor="#006B9F"> <Frame Src=01_Home_Menu.html Frameborder=YES Name=side_menu Marginheight=1 Marginwidth=1> <Frame Src=10_Home_Welcome.html Name=content Marginheight=1 Marginwidth=1> </Frameset> </Html> [ 00_Install_Java.html ] <Html> <Head> <Title>Install Java</Title> </Head> <Frameset Cols="217,*" Align=center BorderColor="#006B9F"> <Frame Src=01_Install_Java_Menu.html Frameborder=YES Name=side_menu Marginheight=1 Marginwidth=1> <Frame Src=10_How_To_Install_Java.html Name=content Marginheight=1 Marginwidth=1> </Frameset> </Html> [ 00_Top_Menu.html ] <Html> <Head>Top Menu</Head> <Body> <Center> <Base target=lower_frame> <Table Border=1 Cellpadding=3 Width=100%> <Tr> <Td Align=Center Bgcolor=#3366FF><A Href=00_Home.html><Font Size=4 Color=White>Home</Font></A></Td> <Td Align=Center Bgcolor=#3366FF><A Href=00_Install_Java.html><Font Size=4 Color=White>Install Java</Font></A></Td> </Tr> </Table> </Center> </Body> </Html> [ 01_Home_Menu.html ] <Html> <Head><Title>Home Menu</Title></Head> <Base Target=content> <Body Bgcolor=#7799DD> <Center> <Table Border=1 Width=100%> <Tr><Td Align=center Bgcolor=#66AAFF><A Href=10_Home_Welcome.html>Welcome</A></Td></Tr> </Table> </Center> </Body> </Html> [ 01_Install_Java_Menu.html ] <Html> <Head><Title>Install Java</Title></Head> <Base Target=content> <Body Bgcolor=#7799DD> <Center> <Table Border=1 Width=100%> <Tr><Td Align=Center Bgcolor=#66AAFF><A Href=10_How_To_Install_Java.html>How To Install Java ?</A></Td></Tr> </Table> </Center> </Body> </Html> [ 10_Home_Welcome.html ] <Html> <Head><Title>NMJava For Software Development</Title></Head> <Body> <Center> <P> <Font Size=5 Color=blue>Welcome To NMJava For Software Development</Font> <P> </Center> </Body> </Html> [ 10_How_To_Install_Java.html ] <Html> <Head> <Title>Install Java</Title> </Head> <Body> <Center> <Br> <Font Size=5 Color=#0022AE><A Href=http://java.com/en/download/index.jsp>How To Install Java ?</A></Font> <Br> <P> <Table Width=90% Cellspacing=5 Cellpadding=5> <Tr><Td><Font Color=#0022AE> You need JRE 6 (Java Runtime Environment) to run the programs on this site. You may or may not have Java already installed on your PC, you can find out by going to the following site, if you don't have the latest version, you can install/upgrade it, it's free from Sun/Oracle at :<Font Size=4> <A Href=http://java.com/en/download/index.jsp>http://java.com/en/download/index.jsp</A></Font>.<P> </Font></Td></Tr> </Table> </Center> </Body> </Html> What's wrong with them, why the two browsers behave differently, and how to fix this ? My site is at : http://nmjava.com , in case you want to see more details. Frank

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