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• Persisting high score table in flash game without a network. (Featuring: HttpListenerException)

  - by bearcdp

  Hi everyone, this question is very programming-centric, but it's for a game so I figured I might as well post it here. I'm doing polishing work on a GGJ '11 game because it will be shown at an indie arcade tomorrow afternoon, and they're expecting our final build in the morning. We'd like to have a high score table that displays during attract mode, but since it's Flash (Flixel) it would require some networking, Mochi, or something to keep a record of these scores. Only problem is the machine we'd be running on probably won't have network access. As a quick solution, I thought I'd just write up a dinky little high score server in C#/.NET that could take basic GET requests for submitting scores and getting the score list. We're talking REAL basic, like blocking while waiting for an incoming request, run & forget console app, etc. There's no guarantee that our .swf won't get reloaded, and we'd like the scores to persist, so this server would pretty much exists to keep a safe copy of the scores that the game can add to and request, and occasionally the server will write the scores to a flat text file. But, HttpListener is giving me Error Code 87 'The parameter is incorrect.' Have any idea what I'm doing wrong? Or better yet, am I barking up the wrong tree and missing an obviously simpler solution? This is all I've got so far in my Main(): HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:66666/"); listener.Start(); The exception happens at listener.Start(); and the stack trace is: at System.Net.HttpListener.AddAllPrefixes() at System.Net.HttpListener.Start() at WOSEBCE_ScoreServer.Program.Main(String[] args) in C:\Users\Michael\Documents\Visual Studio 2010\VS2010 Projects\WOSEBCE_ScoreServer\WOSEBCE_ScoreServer\Program.cs:line 24 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()

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• Adobe Air Mobile AS3 app: challenges and how to overcome them?

  - by Arthur Wulf White

  I made a PC flash game for LD 26 - minimalism and I am working on porting it to Android. Some questions I'd like to ask: Is it bad to heavily use vector graphics (ie. this.graphics.lineTo()) in Mobile Air? Does Stencyl completely alleviate this issue? Are there any inherit disadvantages to using Air Mobile that I'm missing? Where is the documentation for Air mobile (I googled and found no recent books or documentation pdf so far)

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• How to animate the sprite along with action in Cocos2d?

  - by user1201239

  Cocos2d-android - I have an animation which has 5 Frames they are close cropped images. Now I want Sprite to do animation as well as Move in X direction.i.e. I have a player running which gets collided with obstacle and falls down .. Now I want sprite to run animation as well as moveBy in -ve x direction gameOverAnimation =CCSprite.sprite("gmovr00") gameOverAnimation.setAnchorPoint(0, 0); gameOverAnimation.setPosition(340.0f, 200.0f); addChild(gameOverAnimation,10); CCIntervalAction action1 = CCAnimate.action(mEndAnimation, false); action1.setDuration(1.0f); CCIntervalAction delay = CCDelayTime.action(0.68f); CCMoveBy actionBy = CCMoveBy.action(1.0f, CGPoint.ccp(-340,0)); CCIntervalAction seq1 = CCSpawn.actions(action1,actionBy); //CCSpawn spawn = CCSpawn.actions(action1, actionBy); CCSequence sequence1 = CCSequence.actions(seq1,CCCallFuncN.action(this,"gameOver")); gameOverAnimation.runAction(sequence1); Above code makes animation run first then moved in y direction Thanks for the help.. And can some one explaing me the concept of time with frame Animation or good example ?

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• My Sprite comes out the screen

  - by IlNero

  If i an action moves the sprite,how can i keep the CCSprite on the screen???? this is my code: [enemy runAction:[CCSequence actions:[CCMoveBy actionWithDuration:2.0 position:ccp(-winSize.width*0.4, 0)], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(winSize.width*0.2, -winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(winSize.width*0.2, -winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(winSize.width*0.2, -winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(winSize.width*0.2, -winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(winSize.width*0.2, -winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.3,winSize.width*0.3), randomValueBetween(winSize.height*0.3, -winSize.height*0.3))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.2,winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.3,winSize.width*0.3), randomValueBetween(winSize.height*0.3, -winSize.height*0.3))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.2,winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.3,winSize.width*0.3), randomValueBetween(winSize.height*0.3, -winSize.height*0.3))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:randomValueBetween(1.0, 0.3) position:ccp(randomValueBetween(-winSize.width*0.2,winSize.width*0.2), randomValueBetween(winSize.height*0.2, -winSize.height*0.2))], [CCDelayTime actionWithDuration:0.5], [CCMoveBy actionWithDuration:2.0 position:ccp(-winSize.width*1.5, 0)], [CCCallFuncN actionWithTarget:self selector:@selector(invisNode:)], nil]]; but whit this code the sprite sometimes comes out the screen, i need the sprite moves randomly in the screen without comes out..

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• How can you represent equip-able items in a 2d game?

  - by ThePlan

  I've been working on an item system for a post-apocalyptic RPG, with diablo as inspiration, and it would be awesome if I could visually represent an item that can be equipped on the player sprite. I was thinking you could have a player sprite with certain animations, then the equipped item would be drawn as if it was on the player with the same animations, so it syncs with the player animations but that couldn't work very smoothly, I imagine there's a better system. How can you graphically represent an item worn on the player, which moves like he does, and looks as if he's wearing it? I'm not asking you how to do it in framework X or platform X (altho if you REALLY need it, I'm using Allegro 5 with codeblocks on win XP) but instead I'm asking you how to generally program such an idea.

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• How'd they do it: Millions of tiles in Terraria

  - by William 'MindWorX' Mariager

  I've been working up a game engine similar to Terraria, mostly as a challenge, and while I've figured out most of it, I can't really seem to wrap my head around how they handle the millions of interactable/harvestable tiles the game has at one time. Creating around 500.000 tiles, that is 1/20th of what's possible in Terraria, in my engine causes the frame-rate to drop from 60 to around 20, even tho I'm still only rendering the tiles in view. Mind you, I'm not doing anything with the tiles, only keeping them in memory. Update: Code added to show how I do things. This is part of a class, which handles the tiles and draws them. I'm guessing the culprit is the "foreach" part, which iterates everything, even empty indexes. ... public void Draw(SpriteBatch spriteBatch, GameTime gameTime) { foreach (Tile tile in this.Tiles) { if (tile != null) { if (tile.Position.X < -this.Offset.X + 32) continue; if (tile.Position.X > -this.Offset.X + 1024 - 48) continue; if (tile.Position.Y < -this.Offset.Y + 32) continue; if (tile.Position.Y > -this.Offset.Y + 768 - 48) continue; tile.Draw(spriteBatch, gameTime); } } } ... Also here is the Tile.Draw method, which could also do with an update, as each Tile uses four calls to the SpriteBatch.Draw method. This is part of my autotiling system, which means drawing each corner depending on neighboring tiles. texture_* are Rectangles, are set once at level creation, not each update. ... public virtual void Draw(SpriteBatch spriteBatch, GameTime gameTime) { if (this.type == TileType.TileSet) { spriteBatch.Draw(this.texture, this.realm.Offset + this.Position, texture_tl, this.BlendColor); spriteBatch.Draw(this.texture, this.realm.Offset + this.Position + new Vector2(8, 0), texture_tr, this.BlendColor); spriteBatch.Draw(this.texture, this.realm.Offset + this.Position + new Vector2(0, 8), texture_bl, this.BlendColor); spriteBatch.Draw(this.texture, this.realm.Offset + this.Position + new Vector2(8, 8), texture_br, this.BlendColor); } } ... Any critique or suggestions to my code is welcome. Update: Solution added. Here's the final Level.Draw method. The Level.TileAt method simply checks the inputted values, to avoid OutOfRange exceptions. ... public void Draw(SpriteBatch spriteBatch, GameTime gameTime) { Int32 startx = (Int32)Math.Floor((-this.Offset.X - 32) / 16); Int32 endx = (Int32)Math.Ceiling((-this.Offset.X + 1024 + 32) / 16); Int32 starty = (Int32)Math.Floor((-this.Offset.Y - 32) / 16); Int32 endy = (Int32)Math.Ceiling((-this.Offset.Y + 768 + 32) / 16); for (Int32 x = startx; x < endx; x += 1) { for (Int32 y = starty; y < endy; y += 1) { Tile tile = this.TileAt(x, y); if (tile != null) tile.Draw(spriteBatch, gameTime); } } } ...

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• how does HDR work?

  - by dotminic

  I'm trying to understand what HDR is and how it works. I understand the basic concepts and have an slight idea of how it is implemented with D3D/hlsl. However it's still pretty foggy. Say I'm rendering a sphere with a texture of the earth and a small point list of vertices to act as stars, how would I render this in HDR ? Here are a few things I'm confused about: I'm guessing, I can't use just any basic image format for the texture as the values would be limited to [0, 255] and clamped to [0, 1] in a shader. Same goes for the back buffer, I take it the format needs to be a float point format ? What are the other steps involved ? Surely there has to be more than just using floating point formats to render to a render target and then apply some bloom as a post process ? (considering the output will be 8bpp anyway) Basically, what are the steps for HDR ? How does it work ? I can't seem to find any good papers / articles that describe the process, other than this one, but it seems to skim over the basics a little, so it's confusing.

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• Glm Vector Transformations [duplicate]

  - by Reanimation

  This question already has an answer here: Car-like Physics - Basic Maths to Simulate Steering 2 answers I have a cube rendered on the screen which represents a car (or similar). Using Projection/Model matrices and Glm I am able to move it back and fourth along the axes and rotate it left or right. I'm having trouble with the vector mathematics to make the cube move forwards no matter which direction it's current orientation is. (ie. if I would like, if it's rotated right 30degrees, when it's move forwards, it travels along the 30degree angle on a new axes). I hope I've explained that correctly. This is what I've managed to do so far in terms of using glm to move the cube: glm::vec3 vel; //velocity vector void renderMovingCube(){ glUseProgram(movingCubeShader.handle()); GLuint matrixLoc4MovingCube = glGetUniformLocation(movingCubeShader.handle(), "ProjectionMatrix"); glUniformMatrix4fv(matrixLoc4MovingCube, 1, GL_FALSE, &ProjectionMatrix[0][0]); glm::mat4 viewMatrixMovingCube; viewMatrixMovingCube = glm::lookAt(camOrigin, camLookingAt, camNormalXYZ); vel.x = cos(rotX); vel.y=sin(rotX); vel*=moveCube; //move cube ModelViewMatrix = glm::translate(viewMatrixMovingCube,globalPos*vel); //bring ground and cube to bottom of screen ModelViewMatrix = glm::translate(ModelViewMatrix, glm::vec3(0,-48,0)); ModelViewMatrix = glm::rotate(ModelViewMatrix, rotX, glm::vec3(0,1,0)); //manually turn glUniformMatrix4fv(glGetUniformLocation(movingCubeShader.handle(), "ModelViewMatrix"), 1, GL_FALSE, &ModelViewMatrix[0][0]); //pass matrix to shader movingCube.render(); //draw glUseProgram(0); } keyboard input: void keyboard() { char BACKWARD = keys['S']; char FORWARD = keys['W']; char ROT_LEFT = keys['A']; char ROT_RIGHT = keys['D']; if (FORWARD) //W - move forwards { globalPos += vel; //globalPos.z -= moveCube; BACKWARD = false; } if (BACKWARD)//S - move backwards { globalPos.z += moveCube; FORWARD = false; } if (ROT_LEFT)//A - turn left { rotX +=0.01f; ROT_LEFT = false; } if (ROT_RIGHT)//D - turn right { rotX -=0.01f; ROT_RIGHT = false; } Where am I going wrong with my vectors? I would like change the direction of the cube (which it does) but then move forwards in that direction.

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• Can there be an Environment that Reacts to Weather changes in-game?

  - by The415

  Just to be straightforward, I am completely new to many aspects of coding and am searching for different specs and guidelines to aid me on my journey to crafting a wonderful game in Epic Games' Unreal Engine 4. I had some recent thoughts about the possibility of creating an environment in a game that interacts with weather (Rain, Snow, Storms) Is it possible to make an environment that can simulate weather changes in a game? I wrote notes on this for weeks now. I was thinking that an increase on environments occlusion maps was necessary for creating the effect of rain on windows, as well as making a flowing liquid surface on windows that is only visible in rain. I was also considering the idea of additive bump-maps on meshes for snow, to simulate accumulation. Are these elements dynamic in Unreal 4? Can I implement them?

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• How to optimize a box2d simulation in action game?

  - by nathan

  I'm working on an action game and i use box2d for physics. The game use a tiled map. I have different types of body: Static ones used for tiles Dynamic ones for player and enemies Actually i tested my game with ~150 bodies and i have a 60fps constantly on my computer but not on my mobile (android). The FPS drop as the number of body increase. After having profiled the android application, i saw that the World.step took around 8ms in CPU time to execute. Here are few things to note: Not all the world is visible on screen, i use a scrolling system Enemies are constantly moving toward the player so there is alaways to force applied to their body Enemies need to collide between each others Enemies collide with tiles I also now that i can active/desactive or sleep/awake bodies. Considering the fact that only a part of the enemies are possibly displayed on screen, is there any optimizations i can do to reduce the execution time of box2d simulation? I found a guy trying an optimization based on distance of enemies from the player (link). But i seems like he just desactives far bodies (in my case, i could desactive bodies that are not visible). But my enemies need to move even when they are not visible on screen, and applying forces will not workd on inactive bodies. Should i play with sleeping bodies here? Also, enemies are composed by two fixtures and are constantly colliding with each others and with tiles but i really never need to get notified about that. Is there anything i can do to optimize this kind of scenario? Finally, am i wrong to try to run simulation at 60FPS on mobile and should i try to make it run at 30FPS?

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• Trying to make a game with C++, using lists to store bullets and enemies, but they are not erased

  - by XD_dued

  I've been trying to make a pretty simple space shooter game with C++, and I have been having a lot of trouble trying to use lists to store enemies and bullets. Basically I followed the post here almost exactly to store my bullets: SDL Bullet Movement I've done something similar to store my enemies. However, when I call bullets.erase(it++), for some reason the bullet is not erased. When the bullet movement is run for the next frame, it tries to re delete the bullet and segfaults the program. When I comment out the erase line, it runs fine, but the bullets are then never erased from the list... Is there any reason why the elements of the list aren't being deleted? I also set it up to print the number of elements in the list for every iteration, and it does not go down after deleting. Thanks! EDIT: Here's the specific code I'm using to store my enemies and having them act: std::list<Grunt*> doGrunts(std::list<Grunt*> grunts) { for(std::list<Grunt*>::iterator it = grunts.begin(); it != grunts.end();) { if((*it)->getHull() == 0) { delete * it; grunts.erase(it++); } else { (**it).doUnit(grunts, it); ++it; } } } Grunt is my enemy class, and the list grunts is a global variable. Is that my problem? When I pass the global into the function it becomes local? I assumed lists would be a reference type so thought this wouldn't be a problem. Sorry if this was a dumb question, I'm very new to C++, this is the first major thing I'm working on.

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• Tips on how to notify a user of new features in your game (Android)

  - by brent777

  I have noticed a problem when releasing new features for a game that I wrote for Android and published on Google Play Store. Because my game is "stage-based" - and not a game like Hay Day, for example, where users will just go into the game every day since it can't really be finished - my users are not aware of new features that I release for the game. For example, if I publish a new version of my game and it contains a couple new stages, most of their devices will just auto-update the game and they don't even notice this and think to check out what's new. So this is why an approach like popping open a dialog that showcases the new feature(s) when they open the game for the first time after the update was done is not really sufficient. I am looking for some tips on an approach that will draw my users back into the game and then they could read more detail about new features on such a dialog. I was thinking of something like a notification that tells them to check out the new features after an update is done but I am not sure if this is a good idea. Any suggestions to help me solve this problem would be awesome.

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• Collision detection doesn't work for automated elements in XNA 4.0

  - by NDraskovic

  I have a really weird problem. I made a 3D simulator of an "assembly line" as a part of a college project. Among other things it needs to be able to detect when a box object passes in front of sensor. I tried to solve this by making a model of a laser and checking if the box collides with it. I had some problems with BoundingSpheres of models meshes so I simply create a BoundingSphere and place it in the same place as the model. I organized them into a list of BoundingSpheres called "spheres" and for each model I create one BoundingSphere. All models except the box are static, so the box object has its own BoundingSphere (not a member of the "spheres" list). I also implemented a picking algorithm that I use to start the movement. This is the code that checks for collision: if (spheres.Count != 0) { for (int i = 1; i < spheres.Count; i++) { if (spheres[i].Intersects(PickingRay) != null && Microsoft.Xna.Framework.Input.ButtonState.Pressed == Mouse.GetState().LeftButton) { start = true; break; } if (BoxSphere.Intersects(spheres[i]) && start) { MoveBox(0, false);//The MoveBox function receives the direction (0) and a bool value that dictates whether the box should move or not (false means stop) start = false; break; } if (start /*&& Microsoft.Xna.Framework.Input.ButtonState.Pressed == Mouse.GetState().LeftButton*/ && !BoxSphere.Intersects(spheres[i])) { MoveBox(0, true); break; } } The problem is this: When I use the mouse to move the box (the commented part in the third if condition) the collision works fine (I have another part of code that I removed to simplify my question - it calculates the "address" of the box, and by that number I know that the collision is correct). But when I comment it (like in this example) the box just passes trough the lasers and does not detect the collision (the idea is that the box stops at each laser and the user passes it forth by clicking on the appropriate "switch"). Can you see the problem? Please help, and if you need more informations I will try to give them. Thanks

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• Cocos2d Box2d contact listener call different method in collided object

  - by roma86

  I have the building object, wen it hit with other, i want to call some method inside it. Building.mm -(void)printTest { NSLog(@"printTest method work correctly"); } in my ContactListener i trying to call it so: ContactListener.mm #import "ContactListener.h" #import "Building.h" void ContactListener::BeginContact(b2Contact* contact) { b2Body* bodyA = contact->GetFixtureA()->GetBody(); b2Body* bodyB = contact->GetFixtureB()->GetBody(); Building *buildA = (Building *)bodyA->GetUserData(); Building *buildB = (Building *)bodyB->GetUserData(); if (buildB.tag == 1) { NSLog(@"tag == 1"); } if (buildA.tag == 2) { NSLog(@"tag == 2"); [buildA printTest]; } } NSLog(@"tag == 2"); work correctly, but [buildA printTest]; get error Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CCSprite printTest]: unrecognized selector sent to instance 0x18595f0' Obviously I'm referring to the wrong object. How i can get different method and property in contacted objects from contactlistener class? Thanks.

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• How to prevent one account from unlocking products on other devices using Apple StoreKit?

  - by reapz

  We are currently wrapping up a free-to-play game on iOS in which you can purchase non-consumable products. We have been discussing this case internally and are not quite sure what the best practices are as this is our first title. For example, if a user downloads our app, and makes some purchases. These can be restored should the app ever be deleted and reinstalled as long as the user uses the same Apple ID. What is to stop him from making a fake Apple account, purchasing items and then posting this account on the web allowing everyone to get the items for free? That is obviously a worst case situation. But a smaller case would be a user unlocking items for his friends. We do not want this to be an always online game but have considered doing a check on startup if there is internet available. If the currently logged in account doesn't own the products do we lock them again? Probably not because people may simply sign into the device with different Game Center logins at which point we don't want to constantly lock and unlock items. At some point we will be adding multiplayer at which point we can definately do a check with the currently logged in account. This is because A, they will be online when attempting multiplayer, and B, they will want to use their own account for multiplayer. Unfortunately we aren't quite ready for this yet. Has anyone tackled this issue. Are we overthinking here?

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• The true cost to get my XNA game on XBox?

  - by Fëanor

  There seem to be many hurdles to get ones game onto Xbox, so far I have uncovered: You need Visual Studio (once your game becomes commercial you cannot use Express - but have to pay for professional). $1000+ You then buy a XBox to find you also need a harddrive - so buy a Xbox harddrive too. $400 You need to buy XBox Gold LIVE subscription. $70 You need to buy AppHub Creators Club subscription $100 Then after all that I cannot even find the place on my XBox to download Indie games?!!! Seriously WTF - after doing all this I could have come proficient in WebGL and done it all for free... Before I go all the way down this path (hole) are there any other hidden hurdels before I can publish my game? UPDATE: "Indie Games are not available in Australia, due to the requirement for all games to be rated by the Australian Classification Board, and the prohibitive expenses involved."....... im going to have to break something....

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• webgame engine how does it works

  - by TWCrap

  Hy all, first off all, don't yell that i shouldn't start with it, i just want to know how that works... The thing is, how does the engine of an webgame works. A game like tribalwars, grepolis and forge of empires. How does that keeping alive work. I mean, a user is building an building, and quit the browser... The building is build even when the session of the user is expired. but the points of the user is updated when the building is finished... So how does that works. What do you guys think? do they have some kind of cronjob that is fired every second, and that walks throug the database, and search for finished buildings, and update's the stuff? or do you guys think that they do it difrent?!? I hope that i was clear. -NOTE- i don't need anny code, i'm just intrested in the progress behind the game... Greetingz Marc

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• Java getResourceAsStream as local resource

  - by Dajgoro Labinac

  Before using LWJGL, I used the Graphic method, and there I displayed imageicons, and I had the picture file located in the resources. I used: ImageIcon tcard = new ImageIcon(this.getClass().getResource("RCA.png")); to load the image. Now when I load textures in LWJGL, I have to use absolute paths to locate the file: tcard = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("C:/RCA.png")); I tried Googling, but I didn't find anything helpful. How can I load the image from the local resources like in the first example?

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• I don't understand why one of my vbo is overwritten by another

  - by Alays

  to create a vbo I use this function: public void loadVBO(){ vboID = GL15.glGenBuffers(); GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboID); GL15.glBufferData(GL15.GL_ARRAY_BUFFER, buf, GL15.GL_STATIC_DRAW); // Put the position coordinates in attribute list 0 GL20.glVertexAttribPointer(0, 4, GL11.GL_FLOAT, false,4*4+4*4+4*4+2*4 , 0); // Put the color components in attribute list 1 GL20.glVertexAttribPointer(1, 4, GL11.GL_FLOAT, false,4*4+4*4+4*4+2*4 , 4*4); GL20.glVertexAttribPointer(2, 4, GL11.GL_FLOAT, false,4*4+4*4+4*4+2*4 , 4*4+4*4); // Put the texture coordinates in attribute list 2 GL20.glVertexAttribPointer(3, 4, GL11.GL_FLOAT, false,4*4+4*4+4*4+2*4 , 4*4+4*4+4*4); GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0); } to display a vbo I use this function: public void displayVBO(){ GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, vboID); GL20.glEnableVertexAttribArray(0); GL20.glEnableVertexAttribArray(1); GL20.glEnableVertexAttribArray(2); GL20.glEnableVertexAttribArray(3); GL11.glDrawArrays(GL_TRIANGLES, 0, buf.capacity()); GL20.glDisableVertexAttribArray(0); GL20.glDisableVertexAttribArray(1); GL20.glDisableVertexAttribArray(2); GL20.glDisableVertexAttribArray(3); GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0); } So when I call map.loadVBO() and then ocean.loadVBO(), I think the second call overwrite the first vbo I don't know how ... When I call map.display() and ocean.display(), I have the ocean draw 2 times .... Thanks.

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• How do I create a game that runs on Windows, iOS and Android?

  - by AspaApps

  I use C++ to create windows games and now I want to step into another other OS like Android or iOS. I'm totally familiar with C++ so I tried to create app for iOS using objective C it was working awesome. However, I also want to publish games for Android but not by using Java. I don't want to create a single game 5-6 times for other platforms. Is their any way that if I create game for Windows then it will work in Android and iOS ? Or should I use Action Script 3.0? If I use action script 3.0, will it require Flash player to run the game in Windows, Android, iOS?

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• How many VBOs should I use and should I keep a copy of their data?

  - by CSharpie

  Firstofall, I am sorry if my question is to broad. I am developing a tile based game and switched from those gl.Begin calls to using VBOs. This is kind of working allready, I managed to render a hexagonal polygon with a simple shader applied. What I am not sure is, how to implement the "whole" tile concept. Concrete the questions are: Is it better to create 1 VBO for a single tile and render it n-Times in every different position, or render one huge VBO that represents the whole "world" Depending on the answer above, what is the best way to draw a "linegrid". Overlay with the same vbo using the respecting polygon.mode , or is there a way to let the shader to this? How would frustum-culling or mousepicking work then, do i need to keep the VBO-data in memory?

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• Need an engine for MMO mockup

  - by Kayle

  What I don't need is an MMORPG engine, at the moment. What I do need is a flexible easy-to-use engine that I can make a mock-up with. I don't need support for more than 10 players in an instance, so any multiplayer platform is probably fine. I need an engine with which I can create the following core features: Waves of simple AI enemies that have specific objectives (move to point A, destroy target, move to point B). The units present can be between 50-200 in number. An over-the-shoulder view and the ability to control a team of 3 (like Mass Effect or the latest Dragon Age) Functioning inventory system Right now, all I can really think of is Unreal or Source. Any other suggestions? Again, this is a proving mock-up, not an actual MMO. I'm not terribly worried about the visual aspects as we just want to test mechanics. Note: Can write some scripts in Python, Ruby, or Lua, if necessary.

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• Enabling and Disabling components in Unity

  - by Blue

  I'm trying to create an enable/ disable game objects in Unity. I used GameObject.SetActiveRecursively but it only works one-way. I used a collider in which when an object enters the collider. The game objects become enabled. When they leave or get to a certain point, they disable. How would I make this a two way system, making it able to be enabled while inside the collider and disabled when outside the collider? -- The collider is in the game object who is being disabled and enabled. According to this information from Unity Answers, the object becomes disabled. So how would I make the object enabled?

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• Isometric tile range aquisition

  - by Steve

  I'm putting together an isometric engine and need to cull the tiles that aren't in the camera's current view. My tile coordinates go from left to right on the X and top to bottom on the Y with (0,0) being the top left corner. If I have access to say the top left, top right, bot left and bot right corner coordinates, is there a formula or something I could use to determine which tiles fall in range? I've linked a picture of the layout of the tiles for reference. If there isn't one, or there's a better way to determine which tiles are on screen and which to cull, I'm all ears and am grateful for any ideas. I've got a few other methods I may be able to try such as checking the position of the tile against a rectangle. I pretty much just need something quick. Thanks for giving this a read =)

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• Recreating Doodle Jump in Canvas - Platforms spawning out of reach

  - by kushsolitary

  I have started to recreate Doodle Jump in HTML using Canvas. Here's my current progress. As you can see, if you play it for a few seconds, some platforms will be out of the player's reach. I don't know why is this happening. Here's the code which is responsible for the re-spawning of platforms. //Movement of player affected by gravity if(player.y > (height / 2) - (player.height / 2)) { player.y += player.vy; player.vy += gravity; } else { for(var i = 0; i < platforms.length; i++) { var p = platforms[i]; if(player.vy < 0) { p.y -= player.vy; player.vy += 0.08; } if(p.y > height) { position = 0; var h = p.y; platforms[i] = new Platform(); } if(player.vy >= 0) { player.y += player.vy; player.vy += gravity; } } } Also, here's the platform class. //Platform class function Platform(y) { this.image = new Image(); this.image.src = platformImg; this.width = 105; this.height = 25; this.x = Math.random() * (width - this.width); this.y = y || position; position += height / platformCount; //Function to draw it this.draw = function() { try { ctx.drawImage(this.image, this.x, this.y, this.width, this.height); } catch(e) {} }; } You can also see the whole code on the link I provided. Also, when a platform goes out of the view port, the jump animation becomes quirky. I am still trying to find out what's causing this but can't find any solution.

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