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• How can I fix these errors with Panda3D's sample projects?

  - by lhk

  I just installed the latest Panda3D packages on a Mint 12 32-bit virtual machine. Then I downloaded and configured Eclipse and tried to run the Asteroids sample project. The window is created properly. But after rendering the scence once the game freezes. This happens with the other sample apps, too. Here's the error log: DirectStart: Starting the game. Known pipe types: glxGraphicsPipe (all display modules loaded.) :display:gsg:glgsg(warning): Occlusion queries advertised as supported by OpenGL runtime, but could not get pointers to extension functions. OpenGL Warning: glXChooseFBConfig returning NULL, due to attrib=0x6, next=0xffffffff :display:glxdisplay(warning): No suitable FBConfig contexts available; using XVisual only. depth_bits=16 color_bits=24 alpha_bits=8 stencil_bits=8 accum_bits=64 back_buffers=1 stereo=1 force_hardware=1 AL lib: pulseaudio.c:331: PulseAudio returned minreq > tlength/2; expect break up :display:gsg:glgsg(error): at 4765 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid enumerant :display:gsg:glgsg(error): at 5703 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 4654 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 4654 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 4765 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid enumerant :display:gsg:glgsg(error): at 5703 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 3057 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 3057 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 4765 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid enumerant OpenGL Warning: No pincher, please call crStateSetCurrentPointers() in your SPU :display:gsg:glgsg(error): at 4765 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid enumerant :display:gsg:glgsg(error): at 5703 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 4765 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid enumerant :display:gsg:glgsg(error): at 4765 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 4765 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 5703 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 3661 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 3661 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display:gsg:glgsg(error): at 4765 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid enumerant :display:gsg:glgsg(error): at 4765 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid enumerant :display:gsg:glgsg(error): at 5703 of panda/src/glstuff/glGraphicsStateGuardian_src.cxx : invalid operation :display(error): Deactivating glxGraphicsStateGuardian. What can I do to fix the problem ?

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• Algorithm for approximating sihlouette image as polygon

  - by jack

  I want to be able to analyze a texture in real time and approximate a polygon to represent a silhouette. Imagine a person standing in front of a green screen and I want to approximately trace around their outline and get a 2D polygon as the result. Are there algorithms to do this and are they fast enough to work frame-to-frame in a game? (I have found algorithms to triangulate polygons, but I am having trouble knowing what to search for that describes my goal.)

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• Learning XNA/Xbox Development [closed]

  - by CJ Sculti

  Possible Duplicate: How should I go about learning XNA? so I would like to get into Xbox game development (indie games.) The problem is I cant find ANY documentation or place to get started online. I was hoping someone here could point me in the right direction (tutorials or documentation.) I was also hoping someone could direct me to some kind of online course? (Paid or free.) I appreciate your time, thanks.

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• Libgdx Palette Swap

  - by Haedrian

  I'm developing a game using the Libgdx library. I'm trying to implement a very simple palette swap functionality (basically just complete recolouring of some areas, I don't even need to have various shades), but I don't have any idea where to begin. The closest I've come is trying to draw the picture myself using a Pixmap, but that appears to be horrible unmaintainable and produces oodles of code.

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• Can Flash games packed for iOS and other mobile devices achieve reasonable performance?

  - by puppybeard

  I was thinking of developing a game in Flash, as a hobby/educational project. However, I was hoping I could make it run on a smartphone, but a friend who develops in Flash says that in their experience things will move really slow on the likes of an iPad when the Flash packager is used. So slowly that you can't use it commercially for fast-moving games. Has anyone else experienced this slowness? Is there a way around it or is the technology just not there yet?

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• Rotate/Translate object in local space

  - by Mathias Hölzl

  I am just trying to create a movementcontroller class for game entities. These class should transform the entity affected by the mouse and keyboard input. I am able to calculate the changed rotation and the new globalPosition. Then I multiply: newGlobalMatrix = changedRotationMatrix * oldGlobalMatrix; newGlobalMatrix = MatrixSetPosition(newPosition); The problem is that the object rotates around the global axis and not around the local axis. I use XNAMath for the matrix calculation.

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• Electronic circuit simulator four-way flood-filling issues

  - by AJ Weeks

  I've made an electronic circuit board simulator which has simply 3 types of tiles: wires, power sources, and inverters. Wires connect to anything they touch, other than the sides of inverters; inverters have one input side and one output side; and finally power tiles connect in a similar manner as wires. In the case of an infinite loop, caused by the output of the inverter feeding into its input, I want inverters to oscillate (quickly turn on/off). I've attempted to implement a FloodFill algorithm to spread the power throughout the grid, but seem to have gotten something wrong, as only the tiles above the power source get powered (as seen below) I've attempted to debug the program, but have had no luck thus far. My code concerning the updating of power can be seen here.

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• Pack of resources in one big file with XNA

  - by Cristian

  Is it possible to pack all the little .xnb files into one big file? Given the level of abstraction of the XNA Framework I though this would come out of the box but I can't find any well integrated solution. So far the best candidate is XnaZip but in addition to having to compile the resources in a post-build event, and a little trouble porting the game to XBOX I have to rename all the references to resources I have already implemented.

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• Problem with drawing textures in OpenGL ES

  - by droidmachine

  I'm developing a 2D game for Android and i'm using the framework which has been told in the book which named Beginning Android Games by Mario Zechner.So my framework is well designed and using OpenGL 1.1.It's similar to libgdx. When i put my textures adjacent each other in my 2d surface,there are some spaces size as 1 px.But this problem only occur on my tablet.There aren't a problem like this on my phone.It's like in this picture: What can be the problem?I can't fix it from one week.

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• Map building - Tower Defense

  - by Dan K

  Before diving too deep into my question, let it be known that I am learning as far as java script goes and figured a simple Tower Defense game would be an excellent way to learn things. So I have found a simple background image with a path drawn on it and my question is how would I go about building a path so that I can animate my objects. Would I have to take the image and overlay a grid system, or can I store the path in some sort of array and have my objects move across it? Here is the background image:

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• Scaling Down Pixel Art?

  - by Michael Stum

  There's plenty of algorithms to scale up pixel art (I prefer hqx personally), but are there any notable algorithms to scale it down? In my case, the game is designed to run at 1280x720, but if someone plays at a lower resolution I want it to still look good. Most Pixel Art discussions center around 320x200 or 640x480 and upscaling for use in console emulators, but I wonder how modern 2D games like the Monkey Island Remake look good on lower resolutions? (Ignoring the options of having multiple versions of assets (essentially, mipmapping))

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• How to deal with large open worlds?

  - by Mr. Beast

  In most games the whole world is small enough to fit into memory, however there are games where this is not the case, how is this archived, how can the game still run fluid even though the world is so big and maybe even dynamic? How does the world change in memory while the player moves? Examples for this include the TES games (Skyrim, Oblivion, Morrowind), MMORPGs (World of Warcraft), Diablo, Titan Quest, Dwarf Fortress, Far Cry.

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• Making entire scene fade to grayscale

  - by Fibericon

  When the player loses all of their lives, I want the entire game screen to go grayscale, but not stop updating immediately. I'd also prefer it fade to grayscale instead of suddenly lose all color. Everything I've found so far is either about taking a screenshot and making it grayscale, or making a specific texture grayscale. Is there a way to change the entire playing field and all objects within to grayscale without iterating through everything?

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• I'm using OpenAL, trying to load a .ogg file and having .dll troubles

  - by Brendan Webster

  I'm using OpenAL for my game's music, and it loads .wav files by default, but to load in Ogg files I had to download and setup a few .dlls and lib files. I have fixed all errors with dlls except for this: I need vorbis.dll, and it says it's missing vorbis_window. I just can't find the dll anywhere online that includes the vorbis_window, anyone have suggestions on how I should fix this problem with my dll?

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• Why is GL_TEXTURE_MAX_ANISOTROPY_EXT undefined?

  - by Haydn

  So I'm writing my texture class in my opengl game, I get to the part where I would normally set GL_TEXTURE_MAX_ANISOTROPY_EXT, and I'm shocked to discover that it's undefined! This exact same extensions worked perfectly in a different application, so I know it's not a typo or something. It's worth noting that I'm getting my extensions using glcorearb.h, instead of glext.h, because I have no intention of supporting the compatibility profile. Could this be my problem, and if so, how do I work around it?

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• Smoothing found path on grid

  - by Denis Ermolin

  I implemented several approaches such as A* and Potential fields for my tower defense game. But I want smooth paths, first I tried to find path on very small grid ( 5x5 pixels per tile) but it is extremly slow. I found nice video showing an RTS demo where paths are found on big grid but units dont move from each cell's center to center. How do I implement such behavior? Some examples would be great.

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• State / Screen management in Entity Component Systems

  - by David Lively

  My entity/component system is happily humming along and, despite some performance concerns I initially had, everything is working fine. However, I've realized that I missed a crucial point when starting this thing: how do you handle different screens? At the moment, I have a GameManager class which owns a component manager and entity manager. When I create an entity, the entity manager assigns it an ID and makes sure it's tracked. When I modify the components that are assigned to an entity. an UpdateEntity method is called, which alerts each of the systems that they may need to add or remove the entity from their respective entity lists. A problem with this is that the collection of entities operated on by each system is determined solely by the individual Systems, typically based on a "required component" filter. (An entity has to have a Renderable component to be rendered, for instance.) In this situation, I can't just keep collections of entities per screen and only Update/Draw those collections. They'd have to either be added and removed depending on their applicability to the current screen, which would cause their associated components to be removed, or enable/disable entities in a group per screen to hide what's not supposed to be visible. These approaches seem like really, really crappy kludges. What's a good way to handle this? A pretty straightforward way that comes to mind is to create a separate GameManager (which in my implementation owns all of the systems, entities, etc.) per screen, which means that everything outside of the device context would be duplicated. That's bothersome because some things are always visible, or I might want to continue to display the game under a translucent menu window. Another option would be to add a "layer" key to the GameManager class, which could be checked against a displayable layer stack held by the game manager. *System.Draw() would be called for each active layer, in the required order as determined by the stack. When the systems request an iterator for their respective entity collections, it would be pre-filtered to a (cached) set of those entities that participate in the active layer. Those collections could be updated from the same UpdateEntity event that's already used to maintain each system's entity collections. Still, kinda feels like a hack. If I've coded myself into a corner, feel free to throw tomatoes as long as they're labeled with a helpful suggestion. Hooray for learning curves.

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• Collision resolution - Character walking on ascendent ground

  - by marcg11

  I don't know if the solution to this problem is quite straight-foward but I really don't know how to handle collision resolution on a game where the player walks on an ascendent floor which is not flat. How can the player position itself on the y axis depend on the ground x and z (opengl coords)? What if the floor's slope is too much and the player can't go up, how do you handle that? I don't need any code, just a simple explanation would be great.

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• What's a good way to programmatically manage a cloneable entity?

  - by bobobobo

  Say you have missiles or rockets that a player can fire. What's a good way to programmatically manage the cloning of a base rocket, for example? I can think of 2 ways to do it: Player has a currently selected weapon (which is an int) When player shoots, the selectedWeapon member is looked at, and the correct instance of rocket is created (with some base parameters) Or Player has a currently selected weapon (which is a pointer, to a "base instance" of the rocket object) When player shoots, the base instance rocket is cloned, transformed, and shot into the game world

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• Is there a maximum delay an UDP packet can have?

  - by Jens Nolte

  I am currently implementing a real-time network protocol for a multiplayer game using UDP. I am not having any technical difficulties, but as I always have to care about late UDP packets I am wondering just how late they can arrive. I have researched the topic and have not found any mention of it, so I assume there is no technical limitation, but I wonder if common network/internet architecture (or hardware) gives an effective limitation of how late a UDP packet can be delivered.

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• How are bullets simulated in video games?

  - by mahen23

  I have been playing games like MW2 recently and, as a programmer, I tend to ask myself how do they make the game so immersive. For example, how to they simulate bullet speed. When an NPC fires a bullet from his gun, does the bullet really travel from his gun to the given target or do they they completely ignore this part and just put a bullet hole on the target? If the bullet is really travelling from the gun to the target, at what speed is it actually travelling?

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• Smooth animation when using fixed time step

  - by sythical

  I'm trying to implement the game loop where the physics is independent from rendering but my animation isn't as smooth as I would like it to be and it seems to periodically jump. Here is my code: // alpha is used for interpolation double alpha = 0, counter_old_time = 0; double accumulator = 0, delta_time = 0, current_time = 0, previous_time = 0; unsigned frame_counter = 0, current_fps = 0; const unsigned physics_rate = 40, max_step_count = 5; const double step_duration = 1.0 / 40.0, accumulator_max = step_duration * 5; // information about the circ;e (position and velocity) int old_pos_x = 100, new_pos_x = 100, render_pos_x = 100, velocity_x = 60; previous_time = al_get_time(); while(true) { current_time = al_get_time(); delta_time = current_time - previous_time; previous_time = current_time; accumulator += delta_time; if(accumulator > accumulator_max) { accumulator = accumulator_max; } while(accumulator >= step_duration) { if(new_pos_x > 1330) velocity_x = -15; else if(new_pos_x < 70) velocity_x = 15; old_pos_x = new_pos_x; new_pos_x += velocity_x; accumulator -= step_duration; } alpha = accumulator / static_cast<double>(step_duration); render_pos_x = old_pos_x + (new_pos_x - old_pos_x) * alpha; al_clear_to_color(al_map_rgb(20, 20, 40)); // clears the screen al_draw_textf(font, al_map_rgb(255, 255, 255), 20, 20, 0, "current_fps: %i", current_fps); // print fps al_draw_filled_circle(render_pos_x, 400, 15, al_map_rgb(255, 255, 255)); // draw circle // I've added this to test how the program will behave when rendering takes // considerably longer than updating the game. al_rest(0.008); al_flip_display(); // swaps the buffers frame_counter++; if(al_get_time() - counter_old_time >= 1) { current_fps = frame_counter; frame_counter = 0; counter_old_time = al_get_time(); } } I have added a pause during the rendering part because I wanted to see how the code would behave when a lot of rendering is involved. Removing it makes the animation smooth but then I'll have to make sure that I don't let the frame rate drop too much and that doesn't seem like a good solution. I've been trying to fix this for a week and have had no luck so I'd be very grateful if someone can read through my code. Thank you! Edit: I added the following code to work out the actual velocity (pixels per second) of the ball each time the ball is rendered and surprisingly it's not constant so I'm guessing that's the issue. I'm not sure why it's not constant. alpha = accumulator / static_cast<double>(step_duration); render_pos_x = old_pos_x + (new_pos_x - old_pos_x) * alpha; cout << (render_pos_x - old_render_pos) / delta_time << endl; old_render_pos = render_pos_x;

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• How do I make a more or less realistic water surface?

  - by Johnny

  I want to make a similar water surface like in this picture: http://www.publicdomainpictures.net/pictures/20000/velka/water-surface-detail-11291208064MpI.jpg I need the water surface in the same view than in the picture. Is it possible to work without shaders? I want to develop a little game for Xbox Live Indie Marketplace, Windows Phone and maybe later iPhone/iPad. How should I make the water surface, so that it works on multiple platforms?

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• Why did the old 3D games have "jittery" graphics?

  - by dreta

  I've been playing MediEvil lately and it got me wondering, what causes some of the old 3D games have "flowing" graphics when moving? It's present in games like Final Fantasy VII, MediEvil, i remember Dungeon Keeper 2 having the same thing in zoom mode, however f.e. Quake 2 didn't have this "issue" and it's just as old. The resolution doesn't seem to be the problem, everything is rendered perfectly fine when you stand still. So is the game refreshing slowly or it's something to do with buffering?

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• what tool should I use for drawing 2d OpenGL shapes?

  - by Kenny Winker

  I'm working on a very simple OpenGL ES 2.0 game, and I'm not sure what tool to use to create the vertex data I need. My first thought was adobe illustrator, but I can't seem to google up any info on how to convert an .ai file to vertices. I'm only going to be using very simple 2d shapes so I wonder if I need to use a 3d modelling program? How is this typically done, when you are working with 2d non-sprite shapes?

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