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• How can I fit a rectangle to an irregular shape?

  - by Anil gupta

  I used masking for breaking an image into the below pattern. Now that it's broken into different pieces I need to make a rectangle of each piece. I need to drag the broken pieces and adjust to the correct position so I can reconstruct the image. To drag and put at the right position I need to make the pieces rectangles but I am not getting the idea of how to make rectangles out of these irregular shapes. How can I make rectangles for manipulating these pieces? This is a follow up to my previous question.

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• Camera rotation flicker in OpenGL ES 2.0

  - by seahorse

  I implemented an orbit camera in my own OpenGL ES 2.0 application. I was getting extensive amount of flicker while rotating the camera using the mouse. When I added the line eglSwapInterval( ..., 0.1); after eglSwapBuffers() and then the flicker immediately stopped. I am not able to understand why eglSwapInterval solves the flicker problem? (The FPS of my app prior to eglSwapInterval was around 700FPS) (The flicker is NOT due to z-fighting because I have set near and far clip planes as 100 and 500)

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• Get Unity to read in objects name without the need to hard code

  - by N0xus

  I'm trying to get away from having to hard code in the names of objects I want my code to use. For example, I'm use to do it this way: TextAsset test = new TextAsset(); test = (TextAsset)Resources.Load("test.txt", typeof(TextAsset)); What I want to know, is there a way to have so that when I drag my test.txt file onto my object in Unity, my code automatically gets the name of that object? I'm wanting to do this so once I write the code, I don't need to back in and change it should I wish re-use it.

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• What can i use as a 3d Tile map editor?

  - by alfa64

  I need to make grid based levels with 3d models for a dungeon crawler ( as a recent example Legend of Grimrock), but i need to have several layers and place entities with properties and position, angle, etc. I was considering Tiled, using layers as height for each level, but it's very hard to work with and visualize. What can i use for this pourpose? The output format needs to be json, xml, or something i can use on my engine. Ideally i'd want something like Tiled with a 3d visualization/edit mode and support for loading models or at least some visual representation of them.

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• How can I place a ProgressBar in Android using Cocos 2d?

  - by Laxmipriya

  I want to place a horizontal progress bar in my Android application and I want to change its progress color. I used the following code, but the progress bar is not being displayed. CCProgressTimer progressBar = CCProgressTimer.progress("progressbar.png"); progressBar.setType(kCCProgressTimerTypeHorizontalBarLR); progressBar.setScale(5); progressBar.setAnchorPoint(CGPoint.ccp(0, 0)); progressBar.setPosition(CGPoint.ccp(0,0)); addChild(progressBar);

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• Tips on combining the right Art Assets with a 2D Skeleton and making it flexible

  - by DevilWithin

  I am on my first attempt to build a skeletal animation system for 2D side-scrollers, so I don't really have experience of what may appear in later stages. So i ask advice from anyone that been there and done that! My approach: I built a Tree structure, the root node is like the center-of-mass of the skeleton, allowing to apply global transformations to the skeleton. Then, i make the hierarchy of the bones, so when moving a leg, the foot also moves. (I also make a Joint, which connects two bones, for utility). I load animations to it from a simple key frame lerp, so it does smooth movement. I map the animation hierarchy to the skeleton, or a part of it, to see if the structure is alike, otherwise the animation doesnt start. I think this is pretty much a standard implementation for such a thing, even if i want to convert it to a Rag Doll on the fly.. Now to my question: Imagine a game like prototype, there is a skeleton animation of the main character, which can animate all meshes in the game that are rigged the same way.. That way the character can transform into anything without any extra code. That is pretty much what i want to do for a side-scroller, in theory it sounds easy, but I want to know if that will work well. If the different people will be decently animated when using the same skeleton-animation pair. I can see this working well with a Stickman, but what about actual humans? Will the perspective look right, or i will need to dynamically change the sprites attached to bones? What do you recommend for such a system?

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• How to detect collisions in AS3?

  - by Gabriel Meono

  I'm trying to make a simple game, when the ball falls into certain block, you win. Mechanics: The ball falls through several obstacles, in the end there are two blocks, if the ball touches the left block you win, the next level will contain more blocks and less space between them. Test the movie (click on the screen to drop the ball): http://gabrielmeono.com/downloads/Lucky_Hit_Alpha.swf These are the main variables: var winBox:QuickObject;//You win var looseBox:QuickObject;//You loose var gameBall:QuickObject;//Ball dropped Question: How do I trigger a collision function if the ball hits the winBox? (Win message/Next level) Thanks, here is the full code: package { import flash.display.MovieClip; import com.actionsnippet.qbox.*; import flash.events.MouseEvent; [SWF(width = 600, height = 600, frameRate = 60)] public class LuckyHit extends MovieClip { public var sim:QuickBox2D; var winBox:QuickObject; var looseBox:QuickObject; var gameBall:QuickObject; /** * Constructor */ public function LuckyHit() { sim = new QuickBox2D(this); //sim.createStageWalls(); winBox = sim.addBox({x:5,y:600/30, width:300/30, height:10/30, density:0}); looseBox = sim.addBox({x:15,y:600/30, width:300/30, height:10/30, density:0}); // make obstacles for (var i:int = 0; i<(stage.stageWidth/50); i++){ //End sim.addCircle({x:1 + i * 1.5, y:16, radius:0.1, density:0}); sim.addCircle({x:2 + i * 1.5, y:15, radius:0.1, density:0}); //Mid End sim.addCircle({x:0 + i * 2, y:14, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:13, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:12, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:11, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:10, radius:0.1, density:0}); //Middle Start sim.addCircle({x:0 + i * 1.5, y:09, radius:0.1, density:0}); sim.addCircle({x:1 + i * 1.5, y:08, radius:0.1, density:0}); sim.addCircle({x:0 + i * 1.5, y:07, radius:0.1, density:0}); sim.addCircle({x:1 + i * 1.5, y:06, radius:0.1, density:0}); } sim.start(); stage.addEventListener(MouseEvent.CLICK, _clicked); } /** * .. * @param e MouseEvent.CLICK */ private function _clicked(e:MouseEvent) { gameBall = sim.addCircle({x:(mouseX/30), y:(1), radius:0.25, density:5}); } } }

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• How to sync the actions in a mutiplayer game?

  - by Wheeler

  I connect the clients with UDP (its a peer to peer connection on a multicast network) and the clients are sending their positions in every frame (in WP7 it means the default 30 FPS) to each other. This game is kinda a pong game, and my problem is the next: whenever the opponent hits the ball the angle will not be the same on both mobiles. I think its because the latency (1 pixel difference can cause a different angle). So my question is: how can I sync the hitting event?

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• Mobile game production workflow using Html5 and visual studio

  - by Mihalis Bagos

  I want to know of any framework, that lets you build/test applications inside Visual Studio using Html5/JS. We need to be able to have an emulator (like the one on android sdk) for as many devices as possible, and we need to be able to run the application with as few steps as possible (using the "RUN" command in visual studio is no1 choice). Also, this extends to build and deployment to app stores. Is there a way to circumvent the cloud services and build locally? I am at a loss of the plethora of tools and technologies available for game design using Html5. However, I really don't like the way implementations try to get you to rely on their cloud services, so services like appmobi are at the bottom of the favored list.

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• 2D soft-body physics engines?

  - by Griffin

  Hi so i've recently learned the SFML graphics library and would like to use or make a non-rigid body 2D physics system to use with it. I have three questions: The definition of rigid body in Box2d is A chunk of matter that is so strong that the distance between any two bits of matter on the chunk is completely constant. And this is exactly what i don't want as i would like to make elastic, deformable, breakable, and re-connection bodies. 1. Are there any simple 2D physics engines, but with these kinds of characteristics out there? preferably free or opensource? 2. If not could i use box2d and work off of it to create it even if it's based on rigid bodies? 3. Finally, if there is a simple physics engine like this, should i go through with the proccess of creating a new one anyway, simply for experience and to enhance physics math knowledge? I feel like it would help if i ever wanted to modify the code of an existing engine, or create a game with really unique physics. Thanks!

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• Recommended method for XML level loading in XNA

  - by David Saltares Márquez

  I want to use Blender as my level designer tool for an XNA game. Using an existing plugin, I can export my levels to DotScene format which is basically an xml file like this one: <scene formatVersion="1.0.0"> <nodes> <node name="scene-staircase.001"> <position x="10.500000" y="1.400000" z="-9.600000"/> <quaternion x="0.000000" y="0.000000" z="-0.000000" w="1.000000"/> <scale x="1.000000" y="1.000000" z="1.000000"/> <entity name="scene-staircase.001" meshFile="staircase.mesh"/> </node> <node name="Lamp.003"> <position x="11.024290" y="5.903862" z="9.658987"/> <quaternion x="-0.284166" y="0.726942" z="0.342034" w="0.523275"/> <scale x="1.000000" y="1.000000" z="1.000000"/> <light name="Spot.003" type="point"> <colourDiffuse r="0.400000" g="0.154618" b="0.145180"/> <colourSpecular r="0.400000" g="0.154618" b="0.145180"/> <lightAttenuation range="5000.0" constant="1.000000" linear="0.033333" quadratic="0.000000"/> </light> </node> ... </nodes> </scene> Using naming conventions I could easily parse the file and load the correspondent in game content. I am new to XNA and I have seen that there are several methods to load XML files into a game like serializing and deserializing. Which one would you recommend?

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• Beat detection, weird detection

  - by Quincy

  I made this soundanalyzer class to detect beats in songs : // put it on pastebin for the big size, will put it here if people rather want that. pastebin.com/8PdgZPP3 but for some reason its only detecting beats from 637 sec to around 641(sec) and I have no idea why. I know the beats are being inserted from multiple bands since I am finding duplicates and it seems as its assigning a beat to each instant energy value in between those values. Its modeled after this : http://www.flipcode.com/misc/BeatDetectionAlgorithms.pdf So why won't the beats properly register ?

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• This code is of chess game. What is represented by 'DISTANCE' in code? [closed]

  - by rajeshverma423

  package chess; public class Evaluate { public static final int PIECE_KING = 0; public static final int PIECE_QUEEN = 1; public static final int PIECE_ROOK = 2; public static final int PIECE_BISHOP = 3; public static final int PIECE_KNIGHT = 4; public static final int PIECE_PAWN = 5; public static final int FULL_BIT_RANK = 4080; public static final int LAZY_MARGIN = 100; public static final int ISOLATED_PENALTY = 10; public static final int DOUBLE_PENALTY = 4; public static final int[] PIECE_VALUE = { 0, 9, 5, 3, 3, 1 }; public static final int[] PASS_PAWN = { 0, 35, 30, 20, 10, 5 }; public static final byte[] DISTANCE = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 3, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 7, 6, 5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7, 0, 0, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7, 0, 0, 7, 6, 5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 7, 6, 5, 4, 3, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7 };

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• Slick 2D first trial error

  - by pringlesinn

  I followed some advices to learn Slick2D and when I started doing the "SimpleGame" I got my first error. Does anyone have any idea of what is it and how to fix? Sun Dec 26 23:09:12 GMT-03:00 2010 INFO:Slick Build #274 Sun Dec 26 23:09:12 GMT-03:00 2010 INFO:LWJGL Version: 2.0b1 Sun Dec 26 23:09:12 GMT-03:00 2010 INFO:OriginalDisplayMode: 1024 x 768 x 16 @60Hz Sun Dec 26 23:09:12 GMT-03:00 2010 INFO:TargetDisplayMode: 800 x 600 x 0 @0Hz Sun Dec 26 23:09:12 GMT-03:00 2010 ERROR:Could not find a valid pixel format org.lwjgl.LWJGLException: Could not find a valid pixel format at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method) at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52) at org.lwjgl.opengl.WindowsDisplayPeerInfo.initDC(WindowsDisplayPeerInfo.java:54) at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.java:158) at org.lwjgl.opengl.Display.createWindow(Display.java:299) at org.lwjgl.opengl.Display.create(Display.java:848) at org.lwjgl.opengl.Display.create(Display.java:800) at org.newdawn.slick.AppGameContainer.tryCreateDisplay(AppGameContainer.java:299) at org.newdawn.slick.AppGameContainer.access$000(AppGameContainer.java:34) at org.newdawn.slick.AppGameContainer$2.run(AppGameContainer.java:364) at java.security.AccessController.doPrivileged(Native Method) at org.newdawn.slick.AppGameContainer.setup(AppGameContainer.java:345) at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:314) at SimpleGame.main(SimpleGame.java:38) Exception in thread "main" org.newdawn.slick.SlickException: Failed to initialise the LWJGL display at org.newdawn.slick.AppGameContainer.setup(AppGameContainer.java:375) at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:314) at SimpleGame.main(SimpleGame.java:38)

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• Rendering another screen on top of main game screen in fullscreen mode

  - by wolf

  my game runs in fullscreen mode and uses active rendering. The graphics are drawn on the fullscreen window in each game loop: public void render() { Window w = screen.getFullScreenWindow(); Graphics2D g = screen.getGraphics(); renderer.render(g, level, w.getWidth(), w.getHeight()); g.dispose(); screen.update(); } This is the screen.update() method: public void update(){ Window w = device.getFullScreenWindow(); if(w != null){ BufferStrategy s = w.getBufferStrategy(); if(!s.contentsLost()){ s.show(); } } } I want to display another screen on my main game screen (menu, inventory etc). Lets say I have a JPanel inventory, which has a grid of inventory cells (manually drawn) and some Swing components like JPopupMenu. So i tried adding that to my window and repainting it in the game loop, which worked okay most of the time... but sometimes the panel wouldn't get displayed. Blindly moving things around in the inventory worked, but it just didn't display. When i alt-tabbed out and back again, it displayed properly. I also tried drawing the rest of the inventory on my full screen window and using a JPanel to display only the buttons and popupmenus. The inventory displayed properly, but the Swing components keep flickering. I'm guessing this is because I don't know how to combine active and passive rendering. public void render() { Graphics2D g = screen.getGraphics(); invManager.render(g); g.dispose(); screen.update(); invPanel.repaint(); } Should i use something else instead of a JPanel? I don't really need active rendering for these screens, but I don't understand why they sometimes just don't display. Or maybe I should just make my own custom components instead of using Swing? I also read somewhere that using multiple panels/frames in a game is bad practice so should I draw everything on one window/frame/panel? If I CAN use JPanels for this, should I add and remove them every time the inventory is toggled? Or just change their visibility?

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• Collision Detection and Resolution in Three.js

  - by androidmaster

  So at the moment am making a simple game using three.js and three.firstpersonControls.js but with the current Three.js r66, they apparently removed checkWallCollision and then in the r67 firstpersonControls removed support for that collision. SO my question is how would i go about checking collision in 3D using three.js and then resolution to that collision. (Pushing player out of the block) Note I used a 2D array to generate the world so it's only cubes that I have to check collision with.... if this is a bad question or am lacking something please tell me before you -rep me, am just not sure how to do this and google doesn't want to help

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• Game Components, Game Managers and Object Properties

  - by George Duckett

  I'm trying to get my head around component based entity design. My first step was to create various components that could be added to an object. For every component type i had a manager, which would call every component's update function, passing in things like keyboard state etc. as required. The next thing i did was remove the object, and just have each component with an Id. So an object is defined by components having the same Ids. Now, i'm thinking that i don't need a manager for all my components, for example i have a SizeComponent, which just has a Size property). As a result the SizeComponent doesn't have an update method, and the manager's update method does nothing. My first thought was to have an ObjectProperty class which components could query, instead of having them as properties of components. So an object would have a number of ObjectProperty and ObjectComponent. Components would have update logic that queries the object for properties. The manager would manage calling the component's update method. This seems like over-engineering to me, but i don't think i can get rid of the components, because i need a way for the managers to know what objects need what component logic to run (otherwise i'd just remove the component completely and push its update logic into the manager). Is this (having ObjectProperty, ObjectComponent and ComponentManager classes) over-engineering? What would be a good alternative?

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• jMonkey Quest Database

  - by theJollySin

  I am building a game in jMonkey (Java) and I have so far only used default quest text. But now I need to start populating a lot of quests with text. My design requires A LOT of quests texts. What is the best way to build a database of quest texts in jMonkey? I don't have a lot of real experience with databases. Is there a database that integrates well with jMonkey? Here are the ideal properties I want in my database, in order of priority: Reasonably light learning curve Easy portability (in Java) to Windows, Linux, and Mac OSX Good interface with Java Good interface with jMonkey The ability to add properties to the quests: ID, level, gender, quest chain ID, etc. Or am I wrong in thinking I need to use some giant monster like SQL? I haven't been able to find much information on this, so are people using some non-database methods for storing things like quest text in jMonkey?

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• Issue with distinguishing levels in isometric game

  - by Konrad

  I'm working on an isometric game however I am having trouble visually distinguishing between levels in the game. Take the example below, the first image shows concrete blocks at ground level and the following images show an attempt to build a few blocks a level above. As you can see the level above is visually swallowed the one below. I've tried shading to make lower levels darker with respect to camera, but this doesn't work that well.. any ideas?

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• Alternative to pyGame ?

  - by stighy

  Hi, i'm learning something about game programming from a book about "pyGame". pyGame is simple, but... python is a little complex and different from my previous knoweledge about programming. I know "classical" language: C# (also C/C++), Java ... I know a lot of people love Python but for me is a little harder to learn! So i'm looking something like "pyGame" but for java or for c# ... A library with which i can do almost the same thing i can do with pygame (so .. do more with less code ... and headhace). Thank you Ps: excuse my "poor" english!

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• Playing NSF music in FMOD.net

  - by Tesserex

  So, as the title says, I want to be able to play NSF files using FMOD, because my project already uses FMOD and I'd rather not replace it. This will involve figuring out how existing players and emulators work and porting it. I haven't yet found an existing player that uses FMOD. My starting point is the MyNes source from http://sourceforge.net/projects/mynes/. There are two big steps between here and what I'm looking for. MyNes plays from a ROM, not NSF. So, I have to rip out the APU and get it to play NSF files. The MyNes APU uses SlimDX, so I have to convert that to FMOD.NET. I am really stuck about how to go about either of these, because I'm not that familiar with audio formats and it's hard finding resources online. So here are a few questions: From what I can tell from the NSF spec at http://kevtris.org/nes/nsfspec.txt, it's just contains the relevant memory section of the ROM, plus the header. If anyone can verify or correct this that would be great. The emulator APU uses data from the rest of the emulator to play, including things like cycle counts. I'm not sure what replaces this in a standalone player. Can't I just load all the music data at once into a stream and play it? Joining #1 and #2, does the header data from the NSF substitute for some of the ROM data in the emulator code? Using FMOD, will I be following the usercreatedsound example for loading a stream? And does this format count as PCM? Specifically MyNes says PCM8. Any tips on loading / playing the stream in FMOD are appreciated. As an aside, I don't really understand the loading / playing sections of the spec I linked at all. It seems to apply to 6502 systems / emulators only and not to my situation. I know it's a long shot for anyone here to have enough experience in this area to help, but anything you can provide is definitely appreciated. A link to an existing .NET library that does this would be even better, but I don't believe one exists.

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• Interpolate air drag for my game?

  - by Valentin Krummenacher

  So I have a little game which works with small steps, however those steps vary in time, so for example I sometimes have 10 Steps/second and then I have 20 Steps/second. This changes automatically depending on how many steps the user's computer can take. To avoid inaccurate positioning of the game's player object I use y=v0*dt+g*dt^2/2 to determine my objects y-position, where dt is the time since the last step, v0 is the velocity of my object in the beginning of my step and g is the gravity. To calculate the velocity in the end of a step I use v=v0+g*dt what also gives me correct results, independent of whether I use 2 steps with a dt of for example 20ms or one step with a dt of 40ms. Now I would like to introduce air drag. For simplicity's sake I use a=k*v^2 where a is the air drag's acceleration (I am aware that it would usually result in a force, but since I assume 1kg for my object's mass the force is the same as the resulting acceleration), k is a constant (in this case I'm using 0.001) and v is the speed. Now in an infinitely small time interval a is k multiplied by the velocity in this small time interval powered by 2. The problem is that v in the next time interval would depend on the drag of the last which again depends on the v of the last interval and so on... In other words: If I use a=k*v^2 I get different results for my position/velocity when I use 2 steps of 20ms than when I use one step of 40ms. I used to have this problem for my position too, but adding +g*dt^2/2 to the formula for my position fixed the problem since it takes into account that the position depends on the velocity which changes slightly in every infinitely small time interval. Does something like that exist for air drag too? And no, I dont mean anything like Adding air drag to a golf ball trajectory equation or similar, for that kind of method only gives correct results when all my steps are the same. (I hope you can understand my intermediate english, it's not my main language so I would like to say sorry for all the silly mistakes I might have made in my question)

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• Selling Android apps from Latvia? or should I just put banners?

  - by Roger Travis

  I am in Latvia ( which is not supported to sell apps at android market ), so I am thinking about the best way of monetizing my app. So far I've come up with such options: somehow imitate that I am from a supported country, get a bank account there, etc. use PayPal for in-app purchases. The player get, say, first 10 levels for free, but then is asked to pay 0.99$ for the rest of the game. downsides: player might not feel comfortable entering his paypal details into an app. also android market might not really like that. making the app free and get money from advertising... let's do some calculation here, say, I get 1m free downloads, each user during his playtime would see 10 banners, therefor 10m / 1000 * 0.3 = gives roughly 33k$ ( if we use adMob with their 0.3$ per 1000 impressions ). On the other hand, if we use paypal in app purchase, we need a 3% or more conversion rate to beat this... hmm... What do you think about all this? Thanks! edit: from what I just read all over the net, it looks like advertisers will change their eCPM price a lot without you understanding why... while using in-app paypal purchase you can at least somehow monitor the cashflow.

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• I can't scroll my tilemap ... HELP!

  - by Sri Harsha Chilakapati

  Hello and I'm trying to make my own game engine in Java. I have completed all the necessary ones but I can't figure it out with the TileGame class. It just can't scroll. Also there are no exceptions. Here I'm listing the code. TileGame.java @Override public void draw(Graphics2D g) { if (back!=null){ back.render(g); } if (follower!=null){ follower.render(g); follower.draw(g); } for (int i=0; i<actors.size(); i++){ Actor actor = actors.get(i); if (actor!=follower&&getVisibleRect().intersects(actor.getBounds())){ g.drawImage(actor.getAnimation().getFrameImage(), actor.x - OffSetX, actor.y - OffSetY, null); actor.draw(g); } } } /** * This method returns the visible rectangle * @return The visible rectangle */ public Rectangle getVisibleRect(){ return new Rectangle(OffSetX, OffSetY, global.WIDTH, global.HEIGHT); } @Override public void update(){ if (follower!=null){ if (scrollHorizontally){ OffSetX = global.WIDTH/2 - Math.round((float)follower.x) - tileSize; OffSetX = Math.min(OffSetX, 0); OffSetX = Math.max(OffSetX, global.WIDTH - mapWidth); } if (scrollVertically){ OffSetY = global.HEIGHT/2 - Math.round((float)follower.y) - tileSize; OffSetY = Math.min(OffSetY, 0); OffSetY = Math.max(OffSetY, global.HEIGHT - mapHeight); } } for (int i=0; i<actors.size(); i++){ Actor actor1 = actors.get(i); if (getVisibleRect().contains(actor1.x, actor1.y)){ actor1.update(); for (int j=0; j<actors.size(); j++){ Actor actor2 = actors.get(j); if (actor1.isCollidingWith(actor2)){ actor1.collision(actor2); actor2.collision(actor1); } } } } } but the problem is that all the actors are working, but it just won't scroll. Help Please.. Thanks in Advance.

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• GLSL subroutine not being used

  - by amoffat

  I'm using a gaussian blur fragment shader. In it, I thought it would be concise to include 2 subroutines: one for selecting the horizontal texture coordinate offsets, and another for the vertical texture coordinate offsets. This way, I just have one gaussian blur shader to manage. Here is the code for my shader. The {{NAME}} bits are template placeholders that I substitute in at shader compile time: #version 420 subroutine vec2 sample_coord_type(int i); subroutine uniform sample_coord_type sample_coord; in vec2 texcoord; out vec3 color; uniform sampler2D tex; uniform int texture_size; const float offsets[{{NUM_SAMPLES}}] = float[]({{SAMPLE_OFFSETS}}); const float weights[{{NUM_SAMPLES}}] = float[]({{SAMPLE_WEIGHTS}}); subroutine(sample_coord_type) vec2 vertical_coord(int i) { return vec2(0.0, offsets[i] / texture_size); } subroutine(sample_coord_type) vec2 horizontal_coord(int i) { //return vec2(offsets[i] / texture_size, 0.0); return vec2(0.0, 0.0); // just for testing if this subroutine gets used } void main(void) { color = vec3(0.0); for (int i=0; i<{{NUM_SAMPLES}}; i++) { color += texture(tex, texcoord + sample_coord(i)).rgb * weights[i]; color += texture(tex, texcoord - sample_coord(i)).rgb * weights[i]; } } Here is my code for selecting the subroutine: blur_program->start(); blur_program->set_subroutine("sample_coord", "vertical_coord", GL_FRAGMENT_SHADER); blur_program->set_int("texture_size", width); blur_program->set_texture("tex", *deferred_output); blur_program->draw(); // draws a quad for the fragment shader to run on and: void ShaderProgram::set_subroutine(constr name, constr routine, GLenum target) { GLuint routine_index = glGetSubroutineIndex(id, target, routine.c_str()); GLuint uniform_index = glGetSubroutineUniformLocation(id, target, name.c_str()); glUniformSubroutinesuiv(target, 1, &routine_index); // debugging int num_subs; glGetActiveSubroutineUniformiv(id, target, uniform_index, GL_NUM_COMPATIBLE_SUBROUTINES, &num_subs); std::cout << uniform_index << " " << routine_index << " " << num_subs << "\n"; } I've checked for errors, and there are none. When I pass in vertical_coord as the routine to use, my scene is blurred vertically, as it should be. The routine_index variable is also 1 (which is weird, because vertical_coord subroutine is the first listed in the shader code...but no matter, maybe the compiler is switching things around) However, when I pass in horizontal_coord, my scene is STILL blurred vertically, even though the value of routine_index is 0, suggesting that a different subroutine is being used. Yet the horizontal_coord subroutine explicitly does not blur. What's more is, whichever subroutine comes first in the shader, is the subroutine that the shader uses permanently. Right now, vertical_coord comes first, so the shader blurs vertically always. If I put horizontal_coord first, the scene is unblurred, as expected, but then I cannot select the vertical_coord subroutine! :) Also, the value of num_subs is 2, suggesting that there are 2 subroutines compatible with my sample_coord subroutine uniform. Just to re-iterate, all of my return values are fine, and there are no glGetError() errors happening. Any ideas?

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