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• O'Reilly Deal of the day - 10/June/2012 - Introducing HTML5 Game Development

  - by TATWORTH

  Today's deal of the day from O'Reilly at http://shop.oreilly.com/product/0636920022633.do?code=DEAL is Introducing HTML5 Game Development"Making video games is hard work that requires technical skills, a lot of planning, and—most critically—a commitment to completing the project. With this hands-on guide, you’ll learn step-by-step how to create a real 2D game from start to finish. In the process, you’ll use Impact, the JavaScript game framework that works with HTML5’s Canvas element. Not only will you pick up important tips about game design, you’ll also learn how to publish Impact games to the Web, desktop, and mobile—including a method to package your game as a native iOS app. Packed with screen shots and sample code, this book is ideal for game developers of all levels."

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• how can I make the launcher disappear after notication

  - by smoser

  I have a generally stock configured Unity 2d, with the launcher in auto-hide mode. When I get a notification, the launcher pops out and the relevant icon wiggles. That is all functioning well. My problem is that the launcher pops out for maybe 5 seconds before hiding. Often times I'm typing or using the mouse on the portion of the display that is now covered by the launcher. After I've mentally received the notification is there some way to tell the launcher "I've seen this, you can go away now". Note, I'm not wanting to modify or shorten the default display time. I'd be very happy to hit 'alt-h' or some other key combination to make it go away.

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• Beginner's steps to game programming [on hold]

  - by CodeTrasher

  I have graduated from university less than 6 months ago and became a B.Eng in Software Engineering. I have moderate understanding of programming experience from languages like C++, Java and C#. But mostly on simple desktop and mobile applications. I've tried some simple Pong-like games but never finished even the smallest game. I have a couple of nice ideas growing (IMO, at least...) in my mind but don't really know where to begin. 2D is way to go, of course, at the beginning. I just want to hear from more experienced game devs how they started out. Should I make a rough outline of the core idea and mechanics and start working on a prototype of core gameplay? Or should I just practice more by making Pong, Asteroids and that sort of games and get an understanding of those before moving on? Thanks to all!

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• Do I lose/gain performance for discarding pixels even if I don't use depth testing?

  - by Gajoo

  When I first searched for discard instruction, I've found experts saying using discard will result in performance drain. They said discarding pixels will break GPU's ability to use zBuffer properly because GPU have to first run Fragment shader for both objects to check if the one nearer to camera is discarded or not. For a 2D game I'm currently working on, I've disabled both depth-test and depth-write. I'm drawing all objects sorted by their depth and that's all, no need for GPU to do fancy things. now I'm wondering is it still bad if I discard pixels in my fragment shader?

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• Is there any map maker for javaME game?

  - by user1494517

  For the past two weeks I was trying to make a map maker for my java ME 2D RPG game. I failed because i get errors using slick TWL and the forum for this is inactive. So I just wondered is there anyone that knows slick TWL (Themable Widget Library)? Or maybe do you know a good MapMaker where i could upload my map elements build a map and get numbers to use them for building map with LayerManager class? Already found one http://sourceforge.net/projects/tilemapeditor2d/. But the thing is my map elements are in different .png images. In one of those images there is 16 elements (trees water and etc) and those kind of images are 29. So it would be hard to build a map with LayerManager Well I was thinking putting everything into one image and that way it would be simplier.

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• Le futur du jeu vidéo occupera-t-il tout votre salon ? Oui, d'après Microsoft qui a déposé un brevet très intéressant

  La 2D, puis la 3D, des graphismes quasiment photoréalistes, la reconnaissance de mouvements, tout cela tend dans une même direction : rendre le jeu vidéo encore plus immersif. Une demande de brevet déposée par Microsoft montre que l'entreprise a décidé d'aller encore plus loin. Selon le site Patentbolt, qui suit et piste les brevets ayant trait à la high-tech, Microsoft vient de se voir accorder un brevet pour « un environnement d'affichage immersif qui est proposé à l'utilisateur humain par projection d'une image périphérique sur les surfaces de son environnement. Les images périphériques servent d'extension aux images affichées sur l'écran principal. ...

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• How do you ensure consistent experience across multiple graphics cards (or even driver versions)?

  - by Grigory Javadyan

  So I was writing a simple 2D game with OpenGL and SDL and had this problem when there was awful tearing when running in windowed mode (even though I explicitly asked SDL_SetVideoMode to use double buffering). Didn't worry about it all too much because most of the time the game grabs the entire screen, windowed mode is just for debugging. Anyway, yesterday I updated my nVidia drivers and tearing disappeared, the game runs smooth and looks nice in windowed mode too. I can see how the problem may be in the graphics driver, but this leads to a question. Obviously, professional game developers have to deal with a lot of different hardware/software configurations. What are the techniques they use to make sure the game looks the roughly the same on different graphics cards or even the same model of graphics card, but with different driver versions?

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• Any chance for fully working X1600 PCI-E ID 71c3/Unity under Ubuntu 12.04?

  - by user74975

  How can I get Unity working under an ATI Radeon X1600 PCI-E on Ubuntu 12.04? I'm rather Windows guy, but I can do some things with CLI. ATI seems to have ended support for this card for both Windows and Linux. Theres no proper driver in jockey; binary driver from Software Center doesn't give Unity, just Unity 2D. Yes, I've tried the commands from this post - without any positive results; should I try installing drivers manually?

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• Which game library/engine to choose?

  - by AllTheThingsSheSaid

  I'm not a programming beginner at all. I've tried 2 libraries/engines so far, allegro and Unity. For allegro. i think its not good if i wanna make a career in gaming industry since its not powerful enough. I don't feel comfortable with unity. Its more like a software like photoshop or flash. You can do almost everything with pre-defined functions, tools and with less coding. I need something which offers less tools and pre defined functions and more coding work. It would be awesome if its free and c/c++ based. I need both 2D/3D. and please, don't tell me to make my own library, i am not "that" advance. Any other information about gaming industry would be greatly appreciated.

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• Is OpenGL 1.x deprecated?

  - by QuasarDonkey

  I'm familiar with OpenGL 1.x. I typically use SDL with OpenGL 1.4 on Linux, and I've never run into problems, even on my modern system. I've read on the OpenGL site about deprecation and compatibility contexts, but I'm still unclear as to whether it's safe to continue to use old versions of OpenGL, as opposed to using old features in newer versions. When functionality is marked deprecated ... future versions of OpenGL may remove it. Does deprecation simply imply that those functions can't be used alongside newer features? More specifically, are there any systems today (other than embedded) where OpenGL 1.x isn't available? The old-skool stuff like, glBegin, glEnd, glDrawPixels, etc. Note: I'm not a professional games developer, so you'll have to excuse my ignorance. I'm working on a mostly 2D game that I would like to keep multi-platform, supporting at least Linux, Mac, and Windows.

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• How can I perform a masked erase in SDL2?

  - by Kvisle

  I'm trying to implement some shadow/lighting effects in my 2D-project, and I've concluded that if there is an easy way to perform a masked erase on an SDL_Texture, it would make the drawing operations quite cheap. Let's say I have a texture of the part of the level where light is not meant to be rendered. I also have a texture with my "light map"; I want to use this to just draw omni lights from my light sources. Then I want to use the first image to 'subtract' the portions of the light map that are not to be rendered on the final scene. Then I draw my "light map" texture on top of my scene, with additive blending enabled. This sounds like a good theory in my head, but I can't see any functions in the SDL2 API that let me do masked erase from a texture. Am I overlooking something? Does anything like this exist?

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• Scalability of multi-threading in game server

  - by Taylor Hill

  What is a reasonable number of threads for a simple 2D mmo in Java? Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is because I use a blocking method on the input stream, and a workaround seems unnecessarily complex if I were to try to get around it without adding threads. This is mostly for my own edification; I don't expect to have 5 million people playing it ever, or even 5, but I'm wondering what a good scalable solution is, and if this is reasonable for a small server (<30 connections).

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• Compiz ( or even compositing in general) is not starting up when I login. Solution?

  - by ender.cc

  Whenever I log into a desktop environment, it doesn't seem that compositing is starting. Unity 2D works fine, but when I go to Unity 3D Compiz doesn't start up. I have to type compiz --replace & in terminal every time I login. Another example is when I log into a Cinnamon session, theming support is suddenly gone (although this may be a separate issue). If it helps im using the latest (295.40) NVIDIA drivers. EDIT: I am having exactly the same issue in both cases, upgrading from 11.10 and with a clean installation, in 32 and 64 bits. Related post.

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• Data-driven animations

  - by saadtaame

  Say you are using C/SDL for a 2D game project. It's often the case that people use a structure to represent a frame in an animation. The struct consists of an image and how much time the frame is supposed to be visible. Is this data sufficient to represent somewhat complex animation? Is it a good idea to separate animation management code and animation data? Can somebody provide a link to animations tutorials that store animations in a file and retrieve them when needed. I read this in a book (AI game programming wisdom) but would like to see a real implementation.

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• Four monitor setup with two Nvidia graphics cards

  - by user94329

  I'm running Ubuntu 12.04 and I have two nVidia quadro 2000 video cards, each with two monitors plugged in (all 4 monitors are identical). Now I have the latest nVidia drivers, and I'm trying to use the nVidia control panel to use all four monitors, and I can't get it to work. Currently, my configuration is using TwinView to have 2 monitors per X screen. This doesn't work well because either i turn xinerama on, and nothing appears on the screen when I start a X session with Compiz enabled. Things only work in Ubuntu 2D. i turn xinerama off, and compiz works, but now, I cant drag windows between the two screens and i have no idea how to start applications in the other screen. Is there a better way to configure my four monitor setup? Is there a way to get both GPUs onto a single X screen?

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• Collision Detection within Player/Enemy Class

  - by user1264811

  I'm making a 2D platform game. Right now I'm just working on making a very generic Player class. I'm wondering if it would be more efficient/better practice to have an ActionListener within the Player class to detect collisions with Enemy objects (also have an ActionListener) or to handle all the collisions in the main world. Furthermore, I'm thinking ahead about how I will handle collisions with the platforms themselves. I've looked into the double boolean arrays to see which tiles players can go to and which they can't. I don't understand how to use this class and the player class at the same time. Thank you.

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• libgdx - collision detection with tiled map java

  - by user2875021

  currently, I am working on a 2d rpg game which is similar to final fantasy 1-4. I can load up a tiled map and the sprite can walk freely on the map. However, I will like to create a wall for it to stop walking through it. I created three tiled layer Background, Collision, Overhead and one Collision object layer with rectangles only. "How do I handle collisions with the object layer in the tiled map?" "Do I have to create every single rectangle that is in the object layer with Rectangle rectangle = new Rectangle() and rectangle.set(x, y, width, height)in the code?" Thank you very much in advance. Any help is greatly appreciated!

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• How can I keep straight alpha during rendering particles?

  - by April

  Rencently,I was trying to save textures of 3D particles so that I can reuse the in 2D rendering.Now I had some problem with alpha channel.Some artist told me I that my textures should have unpremultiplied alpha channel.When I try to get the rgb value back,I got strange result.Some area went lighter and even totally white.I mainly focus on additive and blend mode,that is: ADDITIVE: srcAlpha VS 1 BLEND: srcAlpha VS 1-srcAlpha I tried a technique called premultiplied alpha.This technique just got you the right rgb value,its all you need on screen.As for alpha value,it worked well with BLEND mode,but not ADDITIVE mode.As you can see in parameters,BLEND mode always controlled its value within 1.While ADDITIVE mode cannot guarantee. I want proper alpha,but it just got too big or too small consider to rgb.Now what can I do?Any help will be great thankful. PS:If you don't understand what I am trying to do,there is a commercial software called "Particle Illusion".You can create various particles and then save the scene to texture,where you can choose to remove background of particles. Now,I changed the title.For some software like maya or AE,what I want is called [straight alpha].

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• Making a level editor for my game

  - by Sherif Maher Eaid

  I am doing a 2D sprite based game in XNA for WP7, The game logic is simple, you start at some point, you want to avoid obstacles and reach a certain goal. obviously I need to make many levels for the game to be challenging and funny. I am considering making a level editor for my game where I can be able to design the level using some kind of GUI then it translates that to a .lvl or something that the game can read and interpret that to a playable level. I am asking for an already made level editor for XNA/WP7.

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• implementing a high level function in a script to call a low level function in the game engine

  - by eat_a_lemon

  In my 2d game engine I have a function that does pathfinding, find_shortest_path. It executes for each time step in the game loop and calculates the next coordinate pair in the series of coordinates to reach the destination object. Now I want to call this function in a scripting language and have it only return the last coordinate pair result. I want the game engine to go about the business of rendering the incremental steps but I don't want the high level script to care about the rendering. The high level script is only for ai game logic. Now I know how to bind a method from C to python but how can I signal and coordinate the wait time between the incremental steps without the high level function returning until its time for the last step?

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• How to implement custom texture formats in Android?

  - by random1337

  What I know: Android can load PNG, BMP, WEBP,... via BitmapFactory. What I want to achive: Load my own 2D file format (e.g. 1-bit texture with a 1-bit alpha channel) and output a RGBA8888 texture. Question: Is there any interface to achieve this?(or any other way) The resulting image is used as a texture for a 3D model. Why would you do that? Saving phone memory and download bandwidth while expanding the texture at runtime to RAM seems reasonable for very simple textures.

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• Does an inventory limit in an MMORPG make sense?

  - by Philipp

  I am currently developing a simple 2d MMORPG. My current focus is the inventory system. I am currently wondering if I should implement a limit on what a player character can carry. Either in form of a maximum weight, a limited number of inventory slots, or a combination of both. Almost every MMORPG I ever played limits inventory space. But plausibility aside, is this really necessary from a gameplay point of view? Maybe it would in fact improve the game experience when I just let the players carry as much stuff as they want. tl;dr: What is the game development rationale behind limiting carrying capacity of player characters?

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• Drawing Transparency in XNA 4.0

  - by dpaz

  Using C# (VS2010) with XNA 4.0, I have a terrain layer (RenderTarget2D) in a 2D side-scroller. My visual system tracks updates to redraw individual tiles, but I am having trouble finding a way to clear out the rectangle where the tile will be drawn, which I must do because A) there may no longer be a tile or B) the tile may itself contain transparency. How can I draw a rectangle of transparency onto an existing RenderTarget2D? I essentially want to clear just that rectangular portion of it. My Google searches have not yielded anything relevant.

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• Can a high FPS negatively affect how a program runs?

  - by rphello101

  Yeah I know this is a broad question and will get down rated, I'm just hoping for some answer before it gets closed. Anyway, I'm using Slick 2D/Java to play around with graphics. I'm having some trouble with trying to move an image. The weird thing is, the code works just fine on my laptop, but the image sporadically moves to (0,0) and stops on my desktop. The only difference between the two is that it says the FPS is about 500 on my laptop and 6600 on my desktop. Can that affect it or does someone have any ideas for what to check on?

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• Google sort GWT 2.2 et met à jour son plug-in pour Eclipse : support de l'HTML5 et meilleure intégration avec Google App Engine

  Google sort GWT 2.2 et met à jour son plug-in pour Eclipse Support de l'HTML5 et meilleure intégration avec Google App Engine au menu Google vient de lancer la version 2.2 de Google Web Tools (GWT) et une nouvelle version de son Google Plugin pour Eclipse. GWT 2.2 intègre de nombreuses nouveautés liées notamment au HTML5, comme l'intégration de l'élément Canvas pour le rendu graphique 2D, et des balises audio et vidéo. On remarquera des API qui sont pour Chris Ramsdale de l'équipe de GWT, « encore expérimentales, qui peuvent changer légèrement sur les deux prochaines versions », mais qu'il estime assez stables pour mériter le détour. Autre nouveauté n...

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