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• GPU optimization question: pre-computed or procedural?

  - by Jay

  Good morning, I'm learning shader program and need some general direction. I want to add noise to my laser beam (like this). Which is the best way to handle it? I could pre-compute an image and pass it to the shader. I could then use the image to change the opacity and easily animate the smoke by changing the offset of the texture lookup. I could also generate noise in the shader and do the same thing the texture was used for. Is it generally better to avoid I/O to the graphics card or the opposite? Thanks!

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• Is it safe to run multiple XNA ContentManager instances on multiple threads?

  - by Boinst

  My XNA project currently uses one ContentManager instance, and one dedicated background thread for loading all content. I wonder, would it be safe to have multiple ContentManager instances, each in it's own dedicated thread, loading different content at the same time? I'm prompted to ask this question because this article makes the following statement: If there are two textures created at the same time on different threads, they will clobber the other and you will end up with some garbage in the textures. I think that what the author is saying here, is that if I access one ContentManager simultaneously on two threads, I'll get garbage. But what if I have separate ContentManager instances for each thread? If no-one knows the answer already from experience, I'll go ahead and try it and see what happens.

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• STL for games, yea or nay?

  - by munificent

  Every programming language has its standard library of containers, algorithms, and other helpful stuff. With languages like C#, Java, and Python, it's practically inconceivable to use the language without its standard lib. Yet, on many C++ games I've worked on, we either didn't use the STL at all, used a tiny fraction of it, or used our own implementation. It's hard to tell if that was a sound decision for our games, or one simply made out of ignorance of the STL. So... is the STL a good fit or not?

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• How can I make a character move forward in a certain direction?

  - by Shaun Wild

  I have an entity class which is updated every game tick. Let's just assume said entity moves forward constantly. What i want to know is, how can i make it so that i can give an angle to a function and it will make my entity move in that direction. let's say for example moveForward(90); Would make my character move to the right, or for example declaring my rotation as a global Integer: moveForward(rotation); rotation++; Would make my entity move around in a small circle, I assume this includes some kind of vector math, which I haven't done any studying on so a brief explanation of that if it's necessary would be nice. I would appreciate a small code snippet and an explanation I can analyze, thanks in advanced :)

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• Reading the memory of a N64

  - by toazron1

  I'm looking for a way to read the memory of a N64, while the game is running, in real time. I have a c# program which hooks into the memory of a running emulator and tracks SSB64 stats. I want to do the same thing with the physical N64. Currently it is possible to read the memory with a gameshark pro, however it's extremely slow, buggy, and not practical for what I am trying to accomplish. Would it be possible to tap into the gameshark, or the N64 directly, to access the memory in real time? Thanks!

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• Android Java: Way to effectively pause system time while debugging?

  - by TheMaster42

  In my project, I call nanoTime and use that to get a deltaTime which I pass to my entities and animations. However, while debugging (for example, stepping through my code), the system time on my phone is happily chugging along, so it's impossible to look at, say, two sequential frames of data in the debugger (since by the time I'm done looking at the first frame, the system time has continued to move ahead by seconds or even minutes). Is there a programming practice or method to pause the system clock (or a way for my code to intercept and fake my deltaTime) whenever I pause execution from the debugger? Additional Information: I'm using Eclipse Classic with the ADT plugin and a Samsung SII, coding in Java. My code invoking nanoTime: http://pastebin.com/0ZciyBtN I do all display via a Canvas object (2D sprites and animations).

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• What's the difference between Pygame's Sound and Music classes?

  - by Southpaw Hare

  What are the key differences between the Sound and Music classes in Pygame? What are the limitations of each? In what situation would one use one or the other? Is there a benefit to using them in an unintuitive way such as using Sound objects to play music files or visa-versa? Are there specifically issues with channel limitations, and do one or both have the potential to be dropped from their channel unreliably? What are the risks of playing music as a Sound?

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• Complex, yet simple crafting system model

  - by KatShot

  I'm working on some arcade shooter/slasher, and the main logline is "Kick'em with everything you want". There's not so many enemies in GDD, main focus is on tons of weapons and gadgets to cause mayhem. To get weapon, you need to craft it, and now crafting system looks simple, like: 1) You got three slots for weapon parts (like A, B, C) 2) You collect misc weapon parts, and when you got atleast one for every slot, you can craft a weapon (for example, if you got A1, B1, B2, B3 and C1, you can craft such models - A1B1C1, A1B2C1, A1B3C1) As for me, this crafting system is too simple, because weapon parts will just fall from the top of screen, often enough. That's why I'm thinking about adding some more crafting system levels, like resources (collect 10 scrap pieces to make part A1 or C3), etc. My question is: How can i add some more complex, still simple, transparent levels in crafting system? upd. For example, in Minecraft or Terraria, first 5-10 crafting recipies quite transparent and simple IMHO. But then it turns into huge mess to understand, how to craft this or that (for example, fishing rod)

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• best way of rendering more 3D models in three.js that not slow down page?

  - by GDevLearner

  I am in the way of creating a 3D web game using threeJS library. This is a multi-player game that players are 3D human models in game, and I need to add a human 3D model for each player that enters the game. Additionally, I want to animate the humans while they walking, but the problem, here is that adding a 3D model and animating that for each player will slow down the game or maybe cause the browser to crash. question: what is the better way of showing and animating the player's models that will not slow down the game?

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• background animation algorithm for single screen

  - by becool_max

  I’m writing simple strategy game (in xna), and would like to have an animated background. In my game all the actions happens inside one screen and thus standard parallax effect does not look appropriate. However, I found a video of a game with suitable background animation for my game http://www.youtube.com/watch?v=Vcxdbjulf90&feature=share&list=PLEEF9ABAB913946E6 (from 3 to 6s, while main character stays at the same place). What is the algorithm to do this stuff? It would be nice if someone can provide a reference for a similar example (language is not important).

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• Moving two objects proportionally

  - by SSL

  I'm trying to move two objects away from each other at a proportional distance, but on different scales. I'm not quite sure how to do this. Object A can go from position 0.1 to 1. Object B has no limits. If object B is decreasing, then Object A should be decreasing at rate R. Likewise, if Object B is increasing, then Object A increases at rate R. How can I tie these two Object positions together so that in an update loop, they automatically update their positions? I tried using: ObjA.Pos += 0.001f * ObjB.VelocityY; //0.001f is the rate This works but there's an error each time it runs. ObjA starts off at its max position 1 but then the next time it will stop at 0.97, 0.94, 0.91 etc.. This is due to the 0.001f rate I put in. Is there a way to control the rate, yet not end up with the rounding error?

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• How can I plot a radius of all reachable points with pathfinding for a Mob (XNA)?

  - by PugWrath

  I am designing a tactical turn based game. The maps are 2d, but do have varying level-layers and blocking objects/terrain. I'm looking for an algorithm for pathfinding which will allow me to show an opaque shape representing all of the possible max-distance pixels that a mob can move to, knowing the mob's max pixel distance. Any thoughts on this, or do I just need to write a good pathfinding algorithm and use it to find the cutoff points for any direction in which an obstacle exists?

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• How do you make a moving character (like entering krys or something like that) [duplicate]

  - by user36505

  This question is an exact duplicate of: How do you make a 2D character in Javascript? [on hold] 1 answer How do you make a fully functioning character? I first thought that you could make an invisible typing box but then found out you can't. Can someone please answer? (In javascript.)

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• (Android) How are OpenGL ES 1 framebuffers and textures sized?

  - by jens

  I am trying to draw to a texture using a framebuffer using OpenGL ES 1.1 on Android, Java. Afterwords I want to overlay this texture full-screen over my game. In theory, this works like a charm, but somehow the coordinates are off. For testing I drew something at (0,0) with width and height 200, and it partly is off-screen. This is how I create the framebuffer: fb = new int[1]; depthRb = new int[1]; renderTex = new int[1]; gl11ep.glGenFramebuffersOES(1, fb, 0); gl11ep.glGenRenderbuffersOES(1, depthRb, 0); // the depth buffer gl.glGenTextures(1, renderTex, 0);// generate texture gl.glBindTexture(GL10.GL_TEXTURE_2D, renderTex[0]); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_REPEAT); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_REPEAT); texBuffer = ByteBuffer.allocateDirect(buf.length*4).order(ByteOrder.nativeOrder()).asIntBuffer(); gl.glTexImage2D(GL10.GL_TEXTURE_2D, 0, GL10.GL_LUMINANCE, texW, texH, 0, GL10.GL_LUMINANCE, GL10.GL_UNSIGNED_BYTE, texBuffer); gl11ep.glBindRenderbufferOES(GL11ExtensionPack.GL_RENDERBUFFER_OES, depthRb[0]); gl11ep.glRenderbufferStorageOES(GL11ExtensionPack.GL_RENDERBUFFER_OES, GL11ExtensionPack.GL_DEPTH_COMPONENT16, texW, texH); Before I draw, I do this: gl11ep.glBindFramebufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, fb[0]); gl.glClearColor(0f, 0f, 0f, 0f); // specify texture as color attachment gl11ep.glFramebufferTexture2DOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, GL11ExtensionPack.GL_COLOR_ATTACHMENT0_OES, GL10.GL_TEXTURE_2D, renderTex[0], 0); // attach render buffer as depth buffer gl11ep.glFramebufferRenderbufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, GL11ExtensionPack.GL_DEPTH_ATTACHMENT_OES, GL11ExtensionPack.GL_RENDERBUFFER_OES, depthRb[0]); I set texW = 1024 and texH = 512. When rendering this texture fullscreen, with a lightmask (size 200x200) placed at (0, 0) and (texW/2, texH/2). You can see that it seems like the coordinate system doesnt start at (0,0) as that light overlaps the screen and the images are not drawn as squares (my lightcone-texture is a circle, not an ellipse). So, how is the coordinate system of this offscreen-drawn texture defined? Thanks

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• How do I convert screen coordinates to between -1 and 1?

  - by bbdude95

  I'm writing a function that allows me to click on my tiles. The origin for my tiles is the center, however, the mouse's origin is the top left. I need a way to transform my mouse coordinates into my tile coordinates. Here is what I already have (but is not working): void mouseClick(int button, int state, int x, int y) { x -= 400; y -= 300; float xx = x / 100; // This gets me close but the number is still high. float yy = y / 100; // It needs to be between -1 and 1 }

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• OpenGL : Keeping alpha in a render buffer

  - by Cyan

  In my current task, i need to render a texture into a render buffer, in order to work on it (apply special filters) there. The result is then considered a "new texture", which is later displayed. This works fine, except when the texture contains some transparent/semi-transparent parts. My current guess it that, within the render buffer, the texture is "merged" with a kind of "grey background". In this case, it obviously impacts the R,G,B color components of transparent pixels. I've yet to find a way around this. Even manually assigning alpha after the rendering process doesn't save the day for semi-transparent pixels, which RGB are "tainted" by the grey background.

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• Modular spaceship control

  - by SSS

  I am developing a physics based game with spaceships. A spaceship is constructed from circles connected by joints. Some of the circles have engines attached. Engines can rotate around the center of circle and create thrust. I want to be able to move the ship in a direction or rotate around a point by setting the rotation and thrust for each of the ship's engines. How can I find the rotation and thrust needed for each engine to achieve this?

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• Looking for feedback on design pattern for simple 2D environment

  - by Le Mot Juiced

  I'm working in iOS. I am trying to make a very simple 2D environment where there are some basic shapes you can drag around with your finger. These shapes should interact in various ways when dropped on each other, or when single-tapped versus double-tapped, etc. I don't know the name for the design pattern I'm thinking of. Basically, you have a bunch of arrays named after attributes, such as "double-tappable" or "draggable" or "stackable". You assign these attributes to the shapes by putting the shapes in the arrays. So, if there's a double-tap event, the code gets the location of it, then iterates through the "double-tappable" array to see if any of its members are in that location. And so on: every interactive event causes a scan through the appropriate array or arrays. It seems like that should work, but I'm wondering if there's a better pattern for the purpose.

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• How to Use Text in Unity3d

  - by ZiG-ZaG

  How Can i Create Text in Unity3D? I Use "3D Text" But Its Always on Top Of Everything! Can You Suggest Anything? I creating a 2D Game So its not Necessarily a 3D Text.. Edit: Because I Building a 2D Game My Scene is Full of Planes in Front of Camera And I want My Text to be Over One of the Planes and when plane is moving My Text appears behind it. But When I Use "3D Text" Its Always In Front of Everything. Sorry for My Bad English...

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• How can a pygame image be colored?

  - by Juicy

  I'm writing a 2d particle system for a game in Pygame[1]. For the particles, I have an image surface loaded from a file -- basically a white primitive drawn over a transparent background. I'd like the particle engine to emit variously colored particles, but I'm not sure how to tell Pygame to color the surface. I've looked through what passes for documentation, but I'm having trouble finding anything. [1] Yeah, I don't really like Pygame, but my course insists I write this project in Python.

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• Application window as polygon texture?

  - by nekome

  Is there a way, or method, to have some application rendered as texture in 3D scene on some polygon, and also have full interactivity with it? I'm talking about Windows platform, and maybe OpenGL but I guess it doesn't matter is it OGL or DX. For example: I run Calculator using WINAPI functions (preferably hidden, not showing on desktop) and I want to render it inside 3D scene on some polygon but still be able to type or click buttons and have it respond. My idea to realize this is to have WINAPI take screenshot (or render it to memory if possible) of that Calculator and pass it to OpenGL as texture for each frame (I'm experimenting with SDL through pygame) and for mouse interactivity to use coordination translation and calculate where on application window it would act, and then use WINAPI functions such as SetCursorPos to set cursor ant others to simulate click or something else. I haven't found any tutorials with topic similar to this one. Am I on a right track? Is there better way to do this if possible at all?

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• I need advice on creating 3D walk cycles in XNA

  - by Zetar

  I want to purchase a number of 3D models from TurboSquid and animate them in an XNA game. I wrote a lot of games from 1985-1999 and have recently become involved with XNA. Now I would like to port one of my old games to the XBOX. I do have a background in 3D animation; but that was years ago. What is the current method for animating a walk cycle with a 3D model and using it inside XNA? Is there a book, software or a tutorial that you can recommend? Thanks in advance and sorry for such a broad and currently naive question.

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• Do open world games need less backstory?

  - by Raceimaztion

  I've played a few open-world games and really enjoyed them, though the ones I've really enjoyed have generally received complaints about how little story there is to them. The Saboteur is one example of this. Fully open-world, good enough story (for me, anyway), engaging gameplay, and still has received complaints in reviews about not having enough story. Do open-world games actually need a full, all-encompassing story? Or can fun and engaging gameplay fill in the gap and let the designer get away with a slightly less complete story?

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• Why do I have to divide the origin of a quad by 4 instead of 2?

  - by vinzBad

  I'm currently transitioning from C#/XNA to C#/OpenTK but I'm getting stuck at the basics. So I have this Sprite-Class: public static bool EnableDebugDraw = true; public float X; public float Y; public float OriginX = 0; public float OriginY = 0; public float Width = 0.1f; public float Height = 0.1f; public Color TintColor = Color.Red; float _layerDepth = 0f; public void Render() { Vector2[] corners = { new Vector2(X-OriginX,Y-OriginY), //top left new Vector2(X +Width -OriginX,Y-OriginY),//top right new Vector2(X +Width-OriginX,Y+Height-OriginY),//bottom rigth new Vector2(X-OriginX,Y+Height-OriginY)//bottom left }; GL.Color3(TintColor); GL.Begin(BeginMode.Quads); { for (int i = 0; i < 4; i++) GL.Vertex3(corners[i].X,corners[i].Y,_layerDepth); } GL.End(); if (EnableDebugDraw) { GL.Color3(Color.Violet); GL.PointSize(3); GL.Begin(BeginMode.Points); { for (int i = 0; i < 4; i++) GL.Vertex2(corners[i]); } GL.End(); GL.Color3(Color.Green); GL.Begin(BeginMode.Points); GL.Vertex2(X + OriginX, Y + OriginY); GL.End(); } With the following setup I try to set the origin of the quad to the middle of the quad. _sprite.OriginX = _sprite.Width / 2; _sprite.OriginY = _sprite.Height / 2; but this sets the origin to the upper right corner of the quad, so i have to _sprite.OriginX = _sprite.Width / 4; _sprite.OriginY = _sprite.Height / 4; However this is not the intended behaviour, could you advise me how I fix this?

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• C++ Parallel Asynchonous task

  - by Doodlemeat

  I am currently building a randomly generated terrain game where terrain is created automatically around the player. I am experiencing lag when the generated process is active, as I am running quite heavy tasks with post-processing and creating physics bodies. Then I came to mind using a parallel asynchronous task to do the post-processing for me. But I have no idea how I am going to do that. I have searched for C++ std::async but I believe that is not what I want. In the examples I found, a task returned something. I want the task to change objects in the main program. This is what I want: // Main program // Chunks that needs to be processed. // NOTE! These chunks are already generated, but need post-processing only! std::vector<Chunk*> unprocessedChunks; And then my task could look something like this, running like a loop constantly checking if there is chunks to process. // Asynced task if(unprocessedChunks.size() > 0) { processChunk(unprocessedChunks.pop()); } I know it's not far from easy as I wrote it, but it would be a huge help for me if you could push me at the right direction. In Java, I could type something like this: asynced_task = startAsyncTask(new PostProcessTask()); And that task would run until I do this: asynced_task.cancel();

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