The Lightweight Java Game Library (LWJGL) provides access to high performance, cross-platform libraries OpenGL and OpenAL. Additionally LWJGL provides access to controllers such as Gamepads, Steering wheel and Joysticks.

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1answer
137 views

OpenGL - zNear and zFar Parameters

I am trying to figure out what each parameter does. In the meantime I am playing around with glOrtho . I have already understood how everything works except zNear and zFar .
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1answer
97 views

lwjgl request display close when undecorated

I want to create a custom titlebar/border for my display/window so I set the corresponding system property to "true" but how do I send a close request to the window manually to react to the ...
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3answers
183 views

What are the semantics of glRotate and glTranslate's parameters?

I have been trying to play with OpenGL after watching some tutorials and I don't understand how the glTranslatef and glRotatef functions work. I believe a simple picture would help me. I understand ...
2
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1answer
168 views

First frame has a much longer delta time than other frames

I had a problem where my AI moved extreme at the first frame and then normal after that. I then figured out it was my delta. It's about 0.016 seconds (60 fps), but the first frame was about 19000 ...
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1answer
135 views

Sprite rotation

I'm using OpenGL and people suggest using glRotate for sprite rotation, but I find that strange. My problem with it is that it rotates the whole matrix, which sort of screws up all my collision ...
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2answers
192 views

Slick2D - Entities and rendering

I have been trying to create my very first game for quite a while, followed some tutorials and stuff, but I am stuck at creating my entity system. I have made a class that extends the Entity class and ...
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1answer
82 views

LWJGL Java 2D collision when lagging

I'm using a tile based collision, but when the game is lagging (the lag isn't the problem) the collision fails and the player falls through tiles. This is the movement/collision detection code of my ...
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3answers
176 views

Advantages and disadvantages of LWJGL for a beginner? [closed]

I am starting a 2D side scroller, tile based RPG sort of game in Java. I do have lots of knowledge in Java, so that's not a problem, but I have NO experience in game development, at all. I had found a ...
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0answers
83 views

OpenGL rendering tiles buggily

In my Terraria based game i use this code to render all of the tiles in 1 chunk: // TODO Auto-generated method stub GL11.glClear(GL11.GL_COLOR_BUFFER_BIT); for (Tile[] var : ...
5
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1answer
232 views

2D Polygon Triangulation

I am creating a game engine using the JBox2D physics engine. It only allows you to create polygon fixtures up to 8 vertices, To create a body with more than 8 vertices, you need to create multiple ...
5
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1answer
261 views

Implementing Vehicles in your game

In the game i am creating as an hobby (learning is the primal goal of it all) i plan to implement a space ship that the player can enter and use to explore it. I tried to search the internet for the ...
0
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1answer
120 views

Optimization with VBOs [closed]

I am currently working on a cube engine and am experiencing some issues with CPU optimization. I store all my quad VBO data inside a Block (at x,y,z of a chunk) class, which is stored inside an array ...
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2answers
232 views

LWJGL texture bleeding fix won't work

I tried a lot of things to fix texture bleeding, but nothing works. I don't want to add a transparent border around my textures, because I already got too many and it would take too much time and I ...
0
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1answer
348 views

Simulate camera movement in two dimensions (OpenGL)

I've been told by the folks over at Stack Overflow that there's no way to move the camera in OpenGL. I'm developing a 2D RPG with LWJGL and need to know the proper way to simulate camera movement as ...
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0answers
283 views

Weapon Class Organization [closed]

Im making a game and i want to organise my weapons, and im having a few doubts on not only the best architecture but also on how to use it properly: The First approach is to make a single Weapon ...
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0answers
122 views

Why must VBOs be “broken in?”

If I create a VBO in LWJGL of, say, 128,000 vertices, and push it to the graphics card, there's a considerable delay. This delay lasts for about 11 to 12 milliseconds. The same thing happens the ...
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1answer
172 views

Game Engine Design for the LWJGL [closed]

I'm about to begin on the engine for the game I am making. However, I am quite uncertain how I should design it. I have heard lots about threaded games, component and asynchronous systems. I'm ...
2
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1answer
43 views

What measurement units are used in the return value of the getWidth method in the UnicodeFont class supplied by Slick2D?

I'm working on a small component for a game that essentially wraps the provided String so that it fits within the width of the provided rectangle. The rectangle is provided by the Slick2D library as ...
2
votes
1answer
116 views

Add vertices to “middle” of VBO

I've been playing around with VBOs as of late (mostly because my game necessitates it), and I've found the need to add new vertices to a VBO, but not necessarily at the end. The game in question is a ...
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0answers
19 views

LWJGL Exporting errors [duplicate]

Whenever I try to open the Jar File I compiled and exported out of Eclipse ( even in the console ) I get this error message: Exception in thread "Thread-1" java.lang.UnsatisfiedLinkError: no lwjgl in ...
2
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0answers
169 views

VBO = glGenBuffers() IllegalStateException [closed]

i'm kinda noob in OpenGL but I have this problem: I get an IllegalStateException at this code: int vboVertex = glGenBuffers(); In-detail exception: Exception in thread "main" ...
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0answers
156 views

Exporting from eclipse with lwjgl using jarsplice

I am in the process of developing a 2D tilebased rpg with eclipse, lwjgl, and slick util. For some reason eclipse seems to be lagging heavily which doesnt make sense as all i have rendering is a ...
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1answer
133 views

How do I use ContactListener in JBOX2D?

I have a character, and I need to know when he's touching a wall/floor. I look for some information but no luck. How do I do that? I saw a few things about ContactListeners and getContactList(). But I ...
4
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1answer
383 views

How do I draw a full resolution texture to a window of the same resolution?

My image is 1280x800, and my screen size is 1280x800. It should draw perfectly. I'm creating a quad the size of the screen, and setting the texture to fit the quad. But right now it draws a square ...
0
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1answer
212 views

Map handling - Indoors/Outdoors and loading large maps

I have two questions regarding the handling of maps. Question 1. My map will consist of outdoor enviroments as well as dungeons, houses etc. How would I go on about connecting the outdoors with the ...
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0answers
92 views

LWJGL: Volume of playAsMusic() does not change?

I am having problems with the playAsMusic() method of the lwjgl (slick-util lib). No matter what I set for the gain, the second parameter, the volume remains the same (yes, I restart the song ...
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1answer
173 views

LWJGL Wait for key press in a single method

Currently I am implementing the possibility in my game to change the keyboard configuration. Therefor, I have a menu in which is a button for each action the player can do. If the player clicks on one ...
2
votes
1answer
336 views

jMonkeyEngine Pros and Cons

I want to know some good reasons to use jMonkeyEngine for a Java 3d game development tool instead of just creating a game with LWJGL myself? I want to know a good reason I should choose this tool. ...
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2answers
190 views

Map logical coordinates to graphical for walking

I'm having a problem with mapping logical coordinates to graphical ones when my character is walking. I've been able to map them without the graphical walking in between, i.e it just "jumps" from one ...
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0answers
177 views

LWJGL Mouse picking when camera rotated

I have third person camera in my game and I have mouse picking which works not so good. It works good only when yaw rotation is lesser than ~75 if yaw is greater than 75 then it fails.. Here is video ...
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1answer
165 views

Textures not rendering with VBOs

After having used display lists for my programs since I started learning OpenGL, I've finally decided to switch to VBOs after experiencing a considerable amount of lag when I started work on a new ...
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2answers
204 views

LWJGL - If I use VBOs what can I do about separate textures?

So basically this is my problem: I am creating a game that needs a texture for each object. Now I would use a sprite sheet but the textures are different sizes. I am using VBOs and I need to some how ...
1
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1answer
120 views

(Java + Slick) How to rotate the Graphics (g) around the X-Axis?

I already tried it by using GL11.glRotatef(45, 1, 0, 0), but the result looks like this:
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3answers
519 views

LWJGL vs Slick2D vs OpenGL. What is the difference?

I was wondering what the difference was between LWJGL, Slick2D, and OpenGL. If I'm not mistaken LWJGL is a library and it has the methods and such, but what are the other two for and how do they use ...
3
votes
1answer
183 views

Minimizing amount of comparisons for collisions?

In my 'Terraria' based game I am having lag issues. The cause of the lag is as follows: Every update loop through all the tiles in the world: If the rectangle that was passed as an arg intersects ...
1
vote
1answer
118 views

AI and rendering to screen

I'm using LWJGL, however I'm a bit confused on what to do. I'm trying to write an AI simulation, however I'm stuck at this problem. I have one camera, and I plan to move the camera to the mob ...
2
votes
1answer
214 views

Odd blending result (semi-transparent 2d quad over 3D scene)

I'm working on a GUI library for my game, and I'm having problems with my blending. I have a 3D scene, which I render with glDrawArrays. In the fragment shader the alpha color is hardcoded 1.0f ...
2
votes
2answers
625 views

LWJGL multiple keyboard/mouse input checks

As in many game libraries such as LWJGL, you can check mouse/keyboard events with Mouse.isButtonDown or Keyboard.IsKeyDown. I want to check for button/key presses, not if it's currently pressed down ...
1
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1answer
231 views

Quaternions, Axis Angles and Rotation Matrices. Which of these should I use for FP Camera?

After 2 weeks of reading many math formulas and such I know what is a Quaternion, an Axis Angles and Matrices. I have made my own math libary (Java) to use on my game (LWJGL). But I'm really confused ...
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3answers
321 views

Why does my collision implementation cause my player to “bounce” when a collision occurs?

I have a player polygon and I check to see if it's colliding with my tiled map with this method: public static boolean playerCollisionWith() { for(int i = 0; i < Blockmap.entities.size(); i++) ...
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0answers
167 views

Why do my LWJGL fonts have dots and lines around them?

When we render fonts there are weird dots and lines around the text. I have no idea why this would happen. Here is an image of what it looks like: Our font class looks like this: package ...
0
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1answer
35 views

Can LWJGL support multiple displays

Can LWJGL support multiple displays either as separated windows or as part of an AWT Window?
2
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1answer
360 views

How to modify VBO data

I am learning LWJGL so i can start working on my game. In order to learn LWJGL I got the idea to implement the map builder so I can get comfortable with graphics programming. Now, for the map ...
1
vote
1answer
230 views

Packing jar files into library jar files

Firstly, this question is not about packing a simple jar file (e.g. lwjgl) into a runnable jar file. I know how to do this using JarSplice. So if I have a game which uses JInput, I will pack my game ...
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0answers
78 views

lwjgl custom icon

I have a little problem with the icon in lwjgl, it doesn't work. I google about it, but i haven't found anything that works for me yet. This is my code for now: PNGDecoder imageDecoder = new ...
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votes
1answer
110 views

Multithreading in lwjgl getting rid of sleep.

I'm trying to use multithreading in my game. However, I can't seem to get rid of the sleep. If I don't it's a blank screen, as there is no time for the computer to actually render the triangleMob as ...
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0answers
66 views

Lwjgl camera causing movement to be mirrored

I'm having a problem in that everything is rendered and the movement is fine. However, everything seems to be mirrored. In the sense that the TriangleMob should move towards me, but it doesn't instead ...
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0answers
222 views

OpenGL: Attempt to allocate a texture too big for the current hardware

I'm getting the following error: java.io.IOException: Attempt to allocate a texture to big for the current hardware at ...
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0answers
113 views

Problem adding texture to VBO with png texmap in OpenGL

I was doing a VBO and able to load all the data of OBJ file but now I have problem adding texture to it. what i did is that I use the slick library to get the texture file and bind it to the VBO ...
2
votes
1answer
208 views

GLSL Multiple Uniform Structs

I'm developing a lighting system for my voxel game, and I have to send multiple (alot, say up to 200) lights to my shader program. Those lights contain the following data: Position (vec3) Color ...