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  • How can I port a MonoGame Windows Phone 8 game to iOS?

    - by Homer_Simpson
    I downloaded the trial version of Xamarin Studio and installed it on my iMac. In addition, I installed Xcode on my iMac so that I can use the iPhone emulators in Xamarin Studio. But I don't know how to use my MonoGame Windows Phone 8 source files in a Xamarin iPhone project. How can I use my Windows Phone code in an iPhone project? Can I import all my existing classes(for example Game1.cs) in an iPhone project without changing something? How can I port a MonoGame Windows Phone 8 game to iOS?

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  • How to implement behavior in a component-based game architecture?

    - by ghostonline
    I am starting to implement player and enemy AI in a game, but I am confused about how to best implement this in a component-based game architecture. Say I have a following player character that can be stationary, running and swinging a sword. A player can transit to the swing sword state from both the stationary and running state, but then the swing must be completed before the player can resume standing or running around. During the swing, the player cannot walk around. As I see it, I have two implementation approaches: Create a single AI-component containing all player logic (either decoupled from the actual component or embedded as a PlayerAIComponent). I can easily how to enforce the state restrictions without creating coupling between individual components making up the player entity. However, the AI-component cannot be broken up. If I have, for example, an enemy that can only stand and walk around or only walks around and occasionally swing a sword, I have to create new AI-components. Break the behavior up in components, each identifying a specific state. I then get a StandComponent, WalkComponent and SwingComponent. To enforce the transition rules, I have to couple each component. SwingComponent must disable StandComponent and WalkComponent for the duration of the swing. When I have an enemy that only stands around, swinging a sword occasionally, I have to make sure SwingComponent only disables WalkComponent if it is present. Although this allows for better mix-and-matching components, it can lead to a maintainability nightmare as each time a dependency is added, the existing components must be updated to play nicely with the new requirements the dependency places on the character. The ideal situation would be that a designer can build new enemies/players by dragging components into a container, without having to touch a single line of engine or script code. Although I am not sure script coding can be avoided, I want to keep it as simple as possible. Summing it all up: Should I lob all AI logic into one component or break up each logic state into separate components to create entity variants more easily?

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  • OpenGL Application displays only 1 frame

    - by Avi
    EDIT: I have verified that the problem is not the VBO class or the vertex array class, but rather something else. I have a problem where my vertex buffer class works the first time its called, but displays nothing any other time its called. I don't know why this is, and it's also the same in my vertex array class. I'm calling the functions in this order to set up the buffers: enable client states bind buffers set buffer / array data unbind buffers disable client states Then in the draw function, that's called every frame: enable client states bind buffers set pointers unbind buffers bind index buffer draw elements unbind index buffer disable client states Is there something wrong with the order in which I'm calling the functions, or is it a more specific code error? EDIT: here's some of the code Code for setting pointers: //element is the vertex attribute being drawn (e.g. normals, colors, etc.) static void makeElementPointer(VertexBufferElements::VBOElement element, Shader *shade, void *elementLocation) { //elementLocation is BUFFER_OFFSET(n) if a buffer is bound switch (element) { .... glVertexPointer(3, GL_FLOAT, 0, elementLocation); //changes based on element .... //but I'm only dealing with } //vertices for now } And that's basically all the code that isn't just a straight OpenGL function call.

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  • How do you cope mentally with one very long piece of work

    - by Asher Einhorn
    This is my first games industry job and my task is to take out one major game component and put in a newer one. So far it's been 5 weeks, and I'm still just staring at errors. I think it could be months before it's at the point that it can compile. It's really getting me down. I'm just changing things over, I'm not really writing anything myself. it's just endless. I fix a thousand errors and nine thousand take their place. I'm sure this must be a common thing, so I was just wondering, how do you cope with this? It doesn't seem like I can break it down into little chunks at all.

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  • Camera Shake in Unreal Engine 4?

    - 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 was wanting to know how to implement a third-person camera shake into my game, for use of the player sprinting, or crouching, etc. All I need is some tips on setting it up. I can figure the rest out.

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  • Understanding dot notation

    - by Starkers
    Here's my interpretation of dot notation: a = [2,6] b = [1,4] c = [0,8] a . b . c = (2*6)+(1*4)+(0*8) = 12 + 4 + 0 = 16 What is the significance of 16? Apparently it's a scalar. Am I right in thinking that a scalar is the number we times a unit vector by to get a vector that has a scaled up magnitude but the same direction as the unit vector? So again, what is the relevance of 16? When is it used? It's not the magnitude of all the vectors added up. The magnitude of all of them is calculated as follows: sqrt( ax * ax + ay * ay ) + sqrt( bx * bx + by * by ) + sqrt( cx * cx + cy * cy) sqrt( 2 * 2 + 6 * 6 ) + sqrt( 1 * 1 + 4 * 4 ) + sqrt( 0 * 0 + 8 * 8) sqrt( 4 + 36 ) + sqrt( 1 + 16 ) + sqrt( 0 + 64) sqrt( 40 ) + sqrt( 17 ) + sqrt( 64) 6.3 + 4.1 + 8 10.4 + 8 18.4 So I don't really get this diagram: Attempting with sensible numbers: a = [1,0] b = [4,3] a . b = (1*0) + (4*3) = 0 + 12 = 12 So what exactly is a . b describing here? The magnitude of that vector? Because that isn't right: the 'a.b' vector = [4,0] sqrt( x*x + y*y ) sqrt( 4*4 + 0*0 ) sqrt( 16 + 0 ) 4 So what is 12 describing?

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  • Correct way to use Farseer Physics in XNA

    - by user1640602
    I am using Farseer Physics for my 2D sidescroller game and I'm not sure how to proceed with it. I currently have a Sprite class (handles nothing but graphics), a GameObject class (contains specific object info like hit points), a World object which contains the list of Bodies, and a Level object which contains all of these objects. Originally I was trying to keep track of the Sprites, GameObjects, and Bodies separately because I felt that would provide loose coupling but it quickly became a headache. So my new idea was to add a Sprite member to the GameObject class but I'm still not sure how to maintain the Bodies because they have to communicate with GameObject. Specifically, my issue is this: The position of the Body is used to draw the Sprite inside of the Level. In order to do that I would have to maintain a link between GameObjects and Bodies. Is this correct or is there a better way to architect my game? If any of this is unclear please ask and I'll try to clarify. Thank you in advance for any help.

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  • How do I draw a dotted or dashed line?

    - by Gagege
    I'm trying to draw a dashed or dotted line by placing individual segments(dashes) along a path and then separating them. The only algorithm I could come up with for this gave me a dash length that was variable based on the angle of the line. Like this: private function createDashedLine(fromX:Float, fromY:Float, toX:Float, toY:Float):Sprite { var line = new Sprite(); var currentX = fromX; var currentY = fromY; var addX = (toX - fromX) * 0.0075; var addY = (toY - fromY) * 0.0075; line.graphics.lineStyle(1, 0xFFFFFF); var count = 0; // while line is not complete while (!lineAtDestination(fromX, fromY, toX, toY, currentX, currentY)) { /// move line draw cursor to beginning of next dash line.graphics.moveTo(currentX, currentY); // if dash is even if (count % 2 == 0) { // draw the dash line.graphics.lineTo(currentX + addX, currentY + addY); } // add next dash's length to current cursor position currentX += addX; currentY += addY; count++; } return line; } This just happens to be written in Haxe, but the solution should be language neutral. What I would like is for the dash length to be the same no matter what angle the line is. As is, it's just adding 75 thousandths of the line length to the x and y, so if the line is and a 45 degree angle you get pretty much a solid line. If the line is at something shallow like 85 degrees then you get a nice looking dashed line. So, the dash length is variable, and I don't want that. How would I make a function that I can pass a "dash length" into and get that length of dash, no matter what the angle is? If you need to completely disregard my code, be my guest. I'm sure there's a better solution.

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  • Are there some methodologies to define a game's rules?

    - by bAN
    I would like to write some rules for a game I have in head but I don't know how to do that. So are there some methodologies or modeling tools (like UML) to do that? I'm thinking about a kind of tree of competencies or some kind of map to be sure that the game is well balanced. I always wonder how the team who imagines some powers in magic the gathering for example does it. Do they have some diagrams to be sure the powers or creatures they imagine are well balanced for the entire game? I'm pretty noob in the game creation so I'll be happy with some directions to seek.. Technical terms or basic principles to learn. Thanks for help.

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  • AndEngine GLES2 - getting Black screen on emulator 4.1

    - by dizworld.com
    I'm new in andengine . I create following code public class MainActivity extends BaseGameActivity { static final int CAMERA_WIDTH = 800; static final int CAMERA_HEIGHT = 480; public Font mFont; public Camera mCamera; //A reference to the current scene public Scene mCurrentScene; public static BaseActivity instance; public EngineOptions onCreateEngineOptions() { instance = this; mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT); return new EngineOptions(true, ScreenOrientation.LANDSCAPE_SENSOR, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), mCamera); } @Override public void onCreateResources(OnCreateResourcesCallback arg0) throws Exception { mFont = FontFactory.create(this.getFontManager(),this.getTextureManager(), 256, 256,Typeface.create(Typeface.DEFAULT, Typeface.BOLD), 32); mFont.load(); } @Override public void onCreateScene(OnCreateSceneCallback arg0) throws Exception { mEngine.registerUpdateHandler(new FPSLogger()); mCurrentScene = new Scene(); Log.v("Scene","enter"); mCurrentScene.setBackground(new Background(0.09804f, 0.7274f, 0.8f)); // return mCurrentScene; } @Override public void onPopulateScene(Scene arg0, OnPopulateSceneCallback arg1) throws Exception { // TODO Auto-generated method stub } } I got code on sites there is returning scene but in AndEngine GLES2 in method onCreateScene() there is no return scene ... so my First run is BLACK .. any suggestion :)

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  • Circle physics and collision using vectors

    - by Joe Hearty
    This is a problem I've been having, When making a set number of filled circles at random locations on a JPanel and applying a gravity (a negative change in the y), each of the circles collide. I want them to have collision detection and push in the opposite direction using vectors but I don't know how to apply that to my scenario could someone help? public void drawballs(Graphics g){ g.setColor (Color.white); //displays circles for(int i = 0; i<xlocationofcircles.length-1; i++){ g.fillOval( (int) xlocationofcircles[i], (int) (ylocationofcircles[i]) ,16 ,16 ); ylocationofcircles[i]+=.2; //gravity if(ylocationofcircles[i] > 550) //stops gravity at bottom of screen ylocationofcircles[i]-=.2; //Check distance between circles(i think..) float distance =(xlocationofcircles[i+1]-xlocationofcircles[i]) + (ylocationofcircles[i+1]-xlocationofcircles[i]); if( Math.sqrt(distance) <16) ...

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  • Ouya / Android : button mapping biwise

    - by scorvi
    I am programming a game with the Gameplay3d Engine. But the Android site has no gamepad support and that is what I need to port my game to Ouya. So I implemented a simple gamepad support and it supports 2 gamepads. So my problem is that I put the button stats in a float array for every gamepad. But the Gameplay3d engine saves their stats in a unsigned int _buttons variable. It is set with bitwise operations and I have no clue how to translate my array to this.

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  • Textual descriptions of 8-bit and 16-bit game engines

    - by ixtmixilix
    I found a good description of the engine in the Sonic games. It describes roughly how the engine works for people writing their own clones. In my case, I am simply interested in getting a general view of how the many 8-bit and 16-bit game engines worked on their respective consoles. So, this is a big-list style question asking, what other online descriptions of specific game engines have people found?

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  • Collision Detection for 2D

    - by Bhaskar
    I am working on a simple game, where I need to do a collision detection of two Texture2D. The code I have written is: bool perPixelCollission = false; Texture2D texture1 = sprite1.Texture; Texture2D texture2 = sprite1.Texture; Vector2 position1 = new Vector2(sprite1.CurrentScope.X, sprite1.CurrentScope.Y); Vector2 position2 = new Vector2(sprite2.CurrentScope.X, sprite2.CurrentScope.Y); uint[] bitsA = new uint[texture1.Width * texture1.Height]; uint[] bitsB = new uint[texture2.Width * texture2.Height]; Rectangle texture1Rectangle = new Rectangle(Convert.ToInt32(position1.X), Convert.ToInt32(position1.Y), texture1.Width, texture1.Height); Rectangle texture2Rectangle = new Rectangle(Convert.ToInt32(position2.X), Convert.ToInt32(position2.Y), texture2.Width, texture2.Height); texture1.GetData<uint>(bitsA); texture2.GetData<uint>(bitsB); int x1 = Math.Max(texture1Rectangle.X, texture2Rectangle.X); int x2 = Math.Min(texture1Rectangle.X + texture1Rectangle.Width, texture2Rectangle.X + texture2Rectangle.Width); int y1 = Math.Max(texture1Rectangle.Y, texture2Rectangle.Y); int y2 = Math.Min(texture1Rectangle.Y + texture1Rectangle.Height, texture2Rectangle.Y + texture2Rectangle.Height); for (int y = y1; y < y2; ++y) { for (int x = x1; x < x2; ++x) { if (((bitsA[(x - texture1Rectangle.X) + (y - texture1Rectangle.Y) * texture1Rectangle.Width] & 0xFF000000) >> 24) > 20 && ((bitsB[(x - texture2Rectangle.X) + (y - texture2Rectangle.Y) * texture2Rectangle.Width] & 0xFF000000) >> 24) > 20) { perPixelCollission = true; break; } } // Reduce amount of looping by breaking out of this. if (perPixelCollission) { break; } } return perPixelCollission; But this code is really making the game slow. Where can I get some very good collision detection tutorial and code? What is wrong in this code?

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  • MarteEngine Tile Collision

    - by opiop65
    I need to add collision to my tile map using MarteEngine. MarteEngine is built of of slick2D. Here's my tile generation code: Code: public void render(GameContainer gc, StateBasedGame game, Graphics g) throws SlickException { for (int x = 0; x < 16; x++) { for (int y = 0; y < 16; y++) { map[x][y] = AIR; air.draw(x * GameWorld.tilesize, y * GameWorld.tilesize); } } for (int x = 0; x < 16; x++) { for (int y = 7; y < 8; y++) { map[x][y] = GRASS; grass.draw(x * tilesize, y * tilesize); } } for (int x = 0; x < 16; x++) { for (int y = 8; y < 10; y++) { map[x][y] = DIRT; dirt.draw(x * tilesize, y * tilesize); } } for (int x = 0; x < 16; x++) { for (int y = 10; y < 16; y++) { map[x][y] = STONE; stone.draw(x * tilesize, y * tilesize); } } super.render(gc, game, g); } And one of my tile classes (they're all the same, the image names are just different): Code: package MarteEngine; import org.newdawn.slick.Image; import org.newdawn.slick.SlickException; import it.randomtower.engine.entity.Entity; public class Grass extends Entity { public static Image grass = null; public Grass(float x, float y) throws SlickException { super(x, y); grass = new Image("res/grass.png"); setHitBox(0, 0, 50, 50); addType(SOLID); } } I tried to do it like this: Code: for (int x = 0; x < 16; x++) { for (int y = 7; y < 8; y++) { map[x][y] = GRASS; Grass.grass.draw(x * tilesize, y * tilesize); } } But it gave me a NullPointerException. No idea why, everything looks initialized right? I would be very grateful for some help!

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  • XNA Rendering vertices that only appear within the cameras view

    - by user1157885
    I'm making a game in XNA and I recall hearing that professionally made games use a technique to only render the polygons that appear within the cameras projection. I've been trying to find something on this to do something similar in my game, could anyone point me in the right direction? Right now all I have is a plane/grid of vertices that you can set the X/Y on which is drawn using DrawUserIndexedPrimitives, but I plan to make a bunch of props as scenery items and I can imagine myself running into issues later on if I don't address this now. Thanks

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  • Best practices on separating Update and Draw on game loop

    - by Galvanize
    I've been working on my first HTML5 prototype and I found a good model that uses the regular Update and Draw loop we see in game dev. My question is, where does one end and the other begins? The question popped when I wanted to rotate and draw an Image, and I kept wondering if the work of changing the tranformation matrix (that I presume would be a bit expensive since it works on the whole pixel array of an image) and calculating the right position do draw it would characterize drawing work, or maybe not, since after that I may need to check for collision or something similar. Thinkig of it, seems like a silly question, but I would like some advice from more experienced developers. Where does does update ends and draw starts? Thanks in advance.

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  • Which isometric angles can be mirrored (and otherwise transformed) for optimization?

    - by Tom
    I am working on a basic isometric game, and am struggling to find the correct mirrors. Mirror can be any form of transform. I have managed to get SE out of SW, by scaling the sprite on X axis by -1. Same applies for NE angle. Something is bugging me, that I should be able to also mirror N to S, but I cannot manage to pull this one off. Am I just too sleepy and trying to do the impossible, or a basic -1 scale on Y axis is not enough? What are the common used mirror table for optimizing 8 angle (N, NE, E, SE, S, SW, W, NW) isometric sprites?

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  • bump mapping with 2 normal maps

    - by DorkMonstuh
    I was wondering if its actually possible to do bump mapping with 2 normal maps... I have tried doing it this way however I get a function overload on max and dot. uniform sampler2D n_mapTex; uniform sampler2D n_mapTex2; uniform sampler2D refTex; varying mediump vec2 TexCoord; varying mediump float vTime; void main() { mediump vec4 wave = texture2D(n_mapTex, TexCoord - vTime); mediump vec4 wave2 = texture2D(n_mapTex2, TexCoord + vTime); mediump vec4 bump = mix(wave2, wave, 0.5); //this extracts the normals from the combined normal maps mediump vec4 normal = normalize(bump.xyzw * 2.0 - 1.0); //determines light position mediump vec3 lightPos = normalize(vec3(0.0, 1.0, 3.0)); mediump float diffuse = max(dot(normal, lightPos),0.0); gl_FragColor = mix(texture2D(refTex, TexCoord), bump, 0.5); }

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  • Adding root bone in 3DS Max?

    - by carlturtle
    my animation artist has made me a nice first person pair of arms, animated it, textured it, and given it to me. Then he went on vacation. I am programming my animations, and I am trying to test the model he has given me. Building my project gives me a warning: Multiple skeletons were found in the file. The first skeleton, named "frame l upperarm" has been moved to be a child of the scene root. The other, "frame r upperarm", will be ignored. Fragment identifier "frame r upperarm". Then an error: "Vertex is bound to bone "frame l forearm", but this bone is not present in the skeleton." I realize this means that there are two skeletons, as said in this problem: Importing 3d model with multiple skeletons I have 3DS Max, but I have no idea how to use it, and Google/CGTalk/Plycount turn up nothing relevant on how to add a root bone or combine skeletons. If anyone knows how, it would help me out greatly. Thanks.

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  • How to detect collisions between sprite and a user generated shape of some sort?

    - by Huwell
    How to detect a collision between a sprite and a user generated shape of some sort. For example. There are some objects on the screen. The user takes their finger and draws an circle shape around a object (The selection rule is painting circle around the sprite, but the painting shapes may be various). I need to detect which object selected, which just like: (demo images) http://i52.tinypic.com/28h0t1g.png

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  • Animating isometric sprites

    - by Mike
    I'm having trouble coming up with a way to animate these 2D isometric sprites. The sprites are stored like this: < Game Folder Root /Assets/Sprites/< Sprite Name /< Sprite Animation /< Sprite Direction /< Frame Number .png So for example, /Assets/Sprites/Worker/Stand/North-East/01.png Sprite sheets aren't really viable for this type of animation. The example stand animation is 61 frames. 61 frames for all 8 directions alone is huge, but there's more then just a standing animation for each sprite. Creating an sf::Texture for every image and every frame seems like it will take up a lot of memory and be hard to keep track of that many images. Unloading the image and loading the next one every single frame seems like it will do a lot of unnecessary work. What's the best way to handle this?

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  • Importing libraries from build.xml file in Eclipse

    - by user3873909
    I am developing a java app and I need to use jnativehook library. I have downloaded the .zip from https://code.google.com/p/jnativehook/downloads/list . There is a bin folder,src folder,build.xml,build.num and 3 .txt files when I extracted this folder. I have included this library in my project by File - project - Java project from existing Ant file And I have tried an example https://code.google.com/p/jnativehook/wiki/examples But I get the following error Exception in thread "main" java.lang.ExceptionInInitializerError at GlobalKeyListenerExample.main(GlobalKeyListenerExample.java:25) Caused by: java.lang.RuntimeException: Unable to locate the native library. at org.jnativehook.GlobalScreen.loadNativeLibrary(GlobalScreen.java:462) at org.jnativehook.GlobalScreen.<init>(GlobalScreen.java:71) at org.jnativehook.GlobalScreen.<clinit>(GlobalScreen.java:53) ... 1 more What location should I give in native library path?

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  • Points around a circumference C#

    - by Lautaro
    Im trying to get a list of vectors that go around a circle, but i keep getting the circle to go around several times. I want one circel and the dots to be placed along its circumference. I want the first dot to start at 0 and the last dot to end just before 360. Also i need to be able to calculate the spacing by the ammount of points. List<Vector2> pointsInPath = new List<Vector2>(); private int ammountOfPoints = 5; private int blobbSize = 200; private Vector2 topLeft = new Vector2(100, 100); private Vector2 blobbCenter; private int endAngle = 50; private int angleIncrementation; public Blobb() { blobbCenter = new Vector2(blobbSize / 2, blobbSize / 2) + topLeft; angleIncrementation = endAngle / ammountOfPoints; for (int i = 0; i < ammountOfPoints; i++) { pointsInPath.Add(getPointByAngle(i * angleIncrementation, 100, blobbCenter)); // pointsInPath.Add(getPointByAngle(i * angleIncrementation, blobbSize / 2, blobbCenter)); } } private Vector2 getPointByAngle(float angle, float distance, Vector2 centre) { return new Vector2((float)(distance * Math.Cos(angle) ), (float)(distance * Math.Sin(angle))) + centre ; }

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  • XNA 2D Spritesheet drawing rendering problem

    - by user24092
    I'm making a tile-based game, using one spritesheet containing all tile graphics. Each tile has a size of 32x32 pixels. The main problem is: when I draw the tile to the screen, if the tile position x and y are not rounded or if scale is activated in spriteBatch.Draw() method (scale != 1.0f), I get some lines of adjacent tiles on the spritesheet into the current tile drawed. I already tried setting SamplerState to PointClamp, removing AntiAlias, but still doesn't work. Here I'll show images of some tests that I made, with a test sprite sheet that I've created (I made a 9x9 spritesheet, with each sprite of size 32x32 containing a unique solid color). Tests: http://img6.imageshack.us/img6/5946/testsqj.png SpriteSheet used: http://imageshack.us/a/img821/1341/tilesm.png Already tried to remove anti-alias, set PointClamp as sampler state, but still getting this issue, XNA keeps drawing part of the adjacent pixels of the texture on the screen. What I want is to get the correct area of the tilesheet texture (as seen in the first test, that gets just the yellow pixels). My question is: Is there any way that I can fix this, WITHOUT adding tile spacing or any other modification involving the tilesheet? Maybe disabling a texture filtering that is done by XNA, or something like that.

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