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  • time issue in render libgdx [duplicate]

    - by jaysingh
    This question is an exact duplicate of: deWitters Game loop in libgdx(Android) pls. help how to implement this loop in render method next_game_tick and GetTickCount(); always contain same time value so player position not updated. @Override public void render() { float deltaTime = Gdx.graphics.getDeltaTime(); Update(deltaTime); Render(deltaTime); } const int TICKS_PER_SECOND = 50; const int SKIP_TICKS = 1000 / TICKS_PER_SECOND; const int MAX_FRAMESKIP = 10; DWORD next_game_tick = GetTickCount(); int loops; bool game_is_running = true; while( game_is_running ) { loops = 0; while( GetTickCount() > next_game_tick && loops < MAX_FRAMESKIP) { update_game(); next_game_tick += SKIP_TICKS; loops++; } display_game(); }

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  • Using glReadBuffer/glReadPixels returns black image instead of the actual image only on Intel cards

    - by cloudraven
    I have this piece of code glReadBuffer( GL_FRONT ); glReadPixels( 0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer ); Which works just perfectly in all the Nvidia and AMD GPUs I have tried, but it fails in almost every single Intel built-in video that I have tried. It actually works in a very old 945GME, but fails in all the others. Instead of getting a screenshot I am actually getting a black screen. If it helps, I am working with the Doom3 Engine, and that code is derived from the built-in screen capture code. By the way, even with the original game I cannot do screen capture on those intel devices anyway. My guess is that they are not implementing the standard correctly or something. Is there a workaround for this?

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  • Choosing a mobile advertising mediator over going it alone

    - by Notbad
    We have finished our first game for IOS/Android. We would like to give it away adding ads to it. I have been reading a lot about the subject but it is a bit overwhelming for starters. From what I read, it seems there are some important points to have into consideration: 1) Do as much localization as you can (target your audience with ads they could be interested for the zone they live in). 2) Do not over advertise in your application. At this moment we have decided to go with AdMob. It seems an easy option to setup for beginners and have a good set of ad networks. My question is, will we earn less for example for iAds using adMob than implementing iAds without a mediator? Are adMob paying less than others (this is what I remember for some artilces I read)?. It would be nice to hear from people with experience on this to let us light our way a bit.

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  • XNA - Debugging/Testing Individual Sprites and Pixel Collision

    - by kwelch
    I ran through the first training on XNA where you make a shooter game. They did some thing that I would not do and I want to use their starting point to learn more things. I want to try better collision and adding a menu. I saw something online with the sonic physics where they have a frame by frame of sonic moving 1 pixel. See picture below. I am new to development, but I have been programming for years now. What would you guys suggest to try these different things out. How would I simulate a similar frame by frame testing as they do in the above picture? Thanks!

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  • Cocos2D: Upgrading from OpenGL ES 1.1 to 2.0

    - by Alex
    I have recently starting upgrading my ios game to the latest Cocos2D (2.0 rc), and I am having some difficulties upgrading my texture generation code to OpenGL 2.0. In the old version I generated images with this code: CCRenderTexture *rt = [CCRenderTexture renderTextureWithWidth:WIDTH height:HEIGHT]; [rt beginWithClear:bgColor.r g:bgColor.g b:bgColor.b a:bgColor.a]; glDisable(GL_TEXTURE_2D); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glVertexPointer(2, GL_FLOAT, 0, verts); glColorPointer(4, GL_FLOAT, 0, colors); glDrawArrays(GL_TRIANGLE_STRIP, 0, (GLsizei)nVerts); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnable(GL_TEXTURE_2D); [rt end]; But since OpenGL 2.0 works differently this code won't work. What is the best way to use the new OpenGL?

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  • Managing time for success in the industry? [closed]

    - by nvillec
    So about a year ago I decided to pursue programming, specifically game development, as a career. I've always been a pretty avid gamer, from chucking turnips at Shy Guys' faces in the 90s, to downing Heroic Deathwing last week. Just recently though, I've been spending a LOT of time playing games and it's starting to show in my programming classes. Yesterday after a discouraging exam, I put my foot down and vowed to myself to keep the gaming:coding ratio in favor of the one that will hopefully pay the bills later on. I realize that knowing games well is a key part of being a good developer, but as I've been recently shown, there's a threshold of pixelated indulgence that must not be crossed if I'm ever going to land my dream job. I'm assuming many of you are quite enthusiastic about games as well. What advice would you give an aspiring programmer regarding time management? Thanks!! (Also, I'm brand new to Stack Exchange...if this belongs somewhere else, I'm happy to move it)

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  • Channelling an explosion along a narrow passage

    - by finnw
    I am simulating explosions in a 2D maze game. If an explosion occurs in an open area, it covers a circular region (this is the easy bit.) However if an explosion occurs in a narrow passage (i.e narrower than the blast range) then it should be "compressed", so that it goes further and also it should go around corners. Ultimately, unless it is completely boxed-in, then it should cover a constant number of pixels, spreading in whatever direction is necessary to reach this total area. I have tried using a shortest-path algorithm to pick the nearest N pixels to the origin avoiding walls, but the effect is exaggerated - the blast travels around corners too easily, making U-turns even when there is a clear path in another direction. I don't know whether this is realistic or not but it is counter-intuitive to players who assume that they can hide around a corner and the blast will take the path of least resistance in a different direction. Is there a well-known (and fast) algorithm for this?

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  • How many achievements should I include, and of what challenge?

    - by stephelton
    I know this question is fairy broad and subjective, but I'm wondering if there's been any published research into what an optimal number of achievements is and what kind of challenge they should present. The game this question directly relates to is a shoot-em-up, but an ideal answer is fairly theoretical. If there are there are too few achievements, or they are not challenging, I would expect they would fail in their goal to keep people playing. If there are too many, or they are unreasonably difficult, I would expect people to quickly give up. I personally witnessed the latter happening in Starcraft 2; a section of the achievements would have you win hundreds of games against their AI opponents (boring!)

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  • Movement in RPG

    - by user1264811
    I want to make an RPG game in which I move tile by tile. So when I hit up, the tile row that I am on decreases by one for example. Also, it's supposed to be a slow movement so that I can see the change in tile, i.e. I can see my sprite move from tile to tile. Currently, with the code I have, when I hit a direction on my keyboard, I move several blocks within seconds and by the time I release the button I have already gotten a nullPointerException error because I have left the map. How can I slow down the movement?

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  • C++: Checking if an object faces a point (within a certain range)

    - by bojoradarial
    I have been working on a shooter game in C++, and am trying to add a feature whereby missiles shot must be within 90 degrees (PI/2 radians) of the direction the ship is facing. The missiles will be shot towards the mouse. My idea is that the ship's angle of rotation is compared with the angle between the ship and the mouse (std::atan2(mouseY - shipY, mouseX - shipX)), and if the difference is less than PI/4 (45 degrees) then the missile can be fired. However, I can't seem to get this to work. The ship's angle of rotation is increased and decreased with the A and D keys, so it is possible that it isn't between 0 and 2*PI, hence the use of fmod() below. Code: float userRotation = std::fmod(user->Angle(), 6.28318f); if (std::abs(userRotation - missileAngle) > 0.78f) return; Any help would be appreciated. Thanks!

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  • How to implement Fog Of War with an shader?

    - by Cambrano
    Okay, I'm creating a RTS game and want to implement an AgeOfEmpires-like Fog Of War(FOW). That means a tile(or pixel) can be: 0% transparent (unexplored) 50% transparent black (explored but not in viewrange) 100% transparent(explored and in viewrange) RTS means I'll have many explorers (NPCs, buildings, ...). Okay, so I have an 2d array of bytes byte[,] explored. The byte value correlates the transparency. The question is, how do I pass this array to my shader? Well I think it is not possible to pass an entire array. So: what technique shall I use to let my shader know if a pixel/tile is visible or not?

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  • Looking for a royalty free sci-fi sounding song thats 1:00+ long, and costs <= $5

    - by CyanPrime
    I'm looking for a royalty free sci-fi sounding song thats 1:00+ long, and costs less then, or is $5 usd. I want to have a nice BGM for my engine demo I'm going to release for a game I'm planing on having go commercial. I don't want to spend too much money on it, so my limit is $5 usd. I want it to be at least a 1:00 in length. Where should I look? Or even better, do you have a link to a song that meets the criteria?

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  • Displaying a grid based map using C++ and sdl

    - by user15386
    I am trying to create a roguelike game using c++ and SDL. However, I am having trouble getting it to display the map, which is represented by a 2d array of a tile class. Currently, my code is this: for (int y = 0; y!=MAPHEIGHT; y++) { for (int x = 0; x!=MAPWIDTH 1; x++) { apply_surface( x * TILEWIDTH, y * TILEHEIGHT, mymap[x][y].image, screen ); } } However, running this code causes it to both dither for a while before opening the SDL window, and (usually) tell me there is an access violation. How can I display my map?

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  • How to acheive a smoother lighting effect

    - by Cyral
    I'm making a tile based game in XNA So currently my lightning looks like this: How can I get it to look like this? Instead of each block having its own tint, it has a smooth overlay. I'm assuming some sort of shader, and to tell it the lighting and blur it some how. But im not an expert with shaders. My current lighting calculates the light, and then passes it to a spritebatch and draws with a color parameter EDIT: No longer uses spritebatch tint, I was testing and now pass parameters to set the light values. But still looking for a way to smooth it

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  • Dynamic navigation mesh changes

    - by Nairou
    I'm currently trying to convert from grids to navigation meshes for pathfinding, since grids are either too coarse for accurate navigation, or too fine to be useful for object tracking. While my map is fairly static, and the navigation mesh could be created in advance, this is somewhat of a tower defense game, where objects can be placed to block paths, so I need a way to recalculate portions of the navigation mesh to allow pathing around them. Is there any existing documentation on good ways to do this? I'm still very new to navigation meshes, so the prospect of modifying them to cut or fill holes sounds daunting.

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  • OpenGL Get Rotated X and Y of quad

    - by matejkramny
    I am developing a game in 2D using LWJGL library. So far I have a rotating box. I have done basic Rectangle collision, but it doesn't work for rotated rectangles. Does OpenGL have a function that returns the vertices of rotated rectangle? Or is there another way of doing this using trigonometry? I had researched how to do this and everything I found was using some matrix that I don't understand so I am asking if there is another way of doing this. For clarification, I am trying to find out the true (rotated) X,Y of each point of the rectangle. Let's say, the first point of a rectangle (top,left) has x=10 y=10.. Width and height is 100 pixels. When I rotate the rectangle using glRotatef() the x and y stay the same. The rotation is happening inside OpenGL. I need to extract the x,y of the rectangle so I can detect collisions properly.

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  • Box2D platformer movement. Should i mess with velocity?

    - by Romeo
    I have a platformer game in which I implemented the movement using a wheel attached to the hero. For jumping I use this: player.body.applyLinearImpulse(new Vec2(0, 30000000), player.body.getPosition()); The problem is that the xVelocity doesn't remain the same during the jump so it isn't looking natural. Is there any way to modify only the x velocity of the body so that before jumping I store it in a variable and after jumping I apply it to the body? I hope you understand what I am trying to say.

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  • Handling player/background movements in 2D games

    - by lukeluke
    Suppose you have your animated character controlled by the player and a 2D world (like the old 2D side-scrolling games). When the user press right on the keyboard, the background is moved to the right. If the path is always horizontal, this is simple to do (incrementation/decrementation of the x-coordinate). But suppose that the path is instead a polygonal chain. My questions are: How do you move the background? How do you move the background if the game objects are managed with a physics engine like box2D?

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  • Multiple objects listening for the same key press

    - by xiaohouzi79
    I want to learn the best way to implement this: I have a hero and an enemy on the screen. Say the hero presses "k" to get out a knife, I want the enemy to react in a certain way. Now, if in my game loop I have a listener for the key press event and I identify a "k" was pressed, the quick and easy way would be to do: // If K pressed // hero.getOoutKnife() // enemy.getAngry() But what is commonly done in more complex games, where say I have 10 types of character on screen and they all need to react in a unique way when the letter "k" is pressed? I can think of a bunch of hacky ways to do this, but would love to know how it should be done properly. I am using C++, but I'm not looking for a code implementation, just some ideas on how it should be done the right way.

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  • Avatar creation / dressing feature

    - by milesmeow
    What is the effort required to use a game engine such as Unreal or Unity, etc. and create an avatar customization features...complete with clothes. The user should be able to customize the body features and the clothes need to then fit onto the customized body. What is needed? Can you create one set of 3D models for clothes and somehow programatically have the clothes adapt to the body shape? I.e. The same shirt model will be able to fit on a skinny person vs. someone with a big beer belly. How difficult is this? What are the steps needed to implement this avatar creation/dressing feature. I'm basically talking about something like in Rockband 3.

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  • Very slow direct3D texture sampling

    - by __dominic
    Hi, So I'm writing a small game using Direct3D 9 and I'm using multitexturing for the terrain. All I'm doing is sampling 3 textures and a blend map and getting the overall color from the three textures based on the color channels from the blend map. Anyway, I am getting a massive frame rate drop when I sample more than 1 texture, I'm going from 120+ fps to just under 50. This is the HLSL code responsible for the slow down: float3 ground = tex2D(GroundTex, multiTex).rgb; float3 stone = tex2D(StoneTex, multiTex).rgb; float3 grass = tex2D(GrassTex, multiTex).rgb; float3 blend = tex2D(BlendMapTex, blendMap).rgb; Am I doing it wrong ? If anyone has any info or tips about texture sampling or anything, that would be nice. Thanks.

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  • RPG Item processing

    - by f00b4r
    I started working on an item system for my (first) game, and I'm having a problem conceptualizing how it should work. Since Items can produce a bunch of potentially non-standard actions (revive a character vs increasing some stat) or have use restrictions (can only revive if a character is dead). For obvious reasons, I don't want to create a new Item class for every item type. What is the best way to handle this? Should I make a handful of item types (field modifiers, status modifiers, )? Is it normal to script item usage? Could (should?) this be combined with the above mentioned solution (have a couple of different sub item types, make special case items usage scripted)? Thanks.

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  • Path Finding for an Arena based map in 3D using NavMesh

    - by Happybirthday
    I have a 3D arena map (consider a small island surrounded by water on all sides) for a multiplayer Tank fight game. The moveable areas are marked using a Navigation Mesh made by the Arena designer. My question is what would be the best way for navigation in such an environment ? Specially considering the case when there is a Bridge at the center of the arena and you could walk under it or even above it ? If suppose the enemy is standing at the top of the Bridge and my AI is at one of the edges of the map ? How can it know whether the enemy is above or below the bridge and how can it navigate till it ?

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  • How do I efficiently generate chunks to fill entire screen when my player moves?

    - by Trixmix
    In my game I generate chunks when the player moves. The chunks are all generated on the fly, but currently I just created a simple flat 8X8 floor. What happens is that when he moves to a new chunk the chunk in the direction of the player gets generated and its neighboring chunks. This is not efficient because the generator does not fill the entire screen. I did try to use recursion but its not as fast as I would like it to be. My question is what would be an efficient way of doing so? How does minecraft do so? When I say this I mean just the way it PICKS which chunks to generate and in what order. Not how they generate or how they are saved in regions, just the order/way it generates them. I just want to know what is a good way to load chunks around the player.

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  • Get collision details from Rectangle.Intersects()

    - by Daniel Ribeiro
    I have a Breakout game in which, at some point, I detect the collision between the ball and the paddle with something like this: // Ball class rectangle.Intersects(paddle.Rectangle); Is there any way I can get the exact coordinates of the collision, or any details about it, with the current XNA API? I thought of doing some basic calculations, such as comparing the exact coordinates of each object on the moment of the collision. It would look something like this: // Ball class if((rectangle.X - paddle.Rectangle.X) < (paddle.Rectangle.Width / 2)) // Collision happened on the left side else // Collision happened on the right side But I'm not sure this is the correct way to do it. Do you guys have any tips on maybe an engine I might have to use to achieve that? Or even good coding practices using this method?

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