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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JBullet: How to add heightmap to dynamic world [on hold]

I implements JBullet into my code. Boxes, spheres work prefectly. But I don't have idea how to implement to my world heightmap(as static object). What type of shape I must use and how? My heightmap ...
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26 views

Java LWJGL - How can I click to interact with objects?

I want to be able to click on a monster to walk to him and start attacking him. The part that doesnt make sense to me is the conversion between the mouse position, and the actual terrain position. ...
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51 views

Generating proper heightmaps? [closed]

So right now I am using greyscale heightmaps to load the height of the terrain to my game. So far I cannot seem to create a heightmap in which I can actually control where land masses are etc. I just ...
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1answer
70 views

VBO -> How should it be done?

I'm very new to OpenGL/LWJGL. I'm reading a lot of VBOs. I'm sorry if I can't concretise my concern, but i'll try it: Why should I use VBOs? Whats the difference between using VBOs and glBegin() ...
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30 views

Edit VBO data or create a new one?

I have a question: if I have a VBO, and I have to change all the data inside it (because of resizing, ...), would it be more efficient to delete the old one and create a new one (and reallocate the ...
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2answers
45 views

Resizing a Framebuffer Object (ie: its attachments) on Screen Resize

I have been experimenting with some post-processing effects and I have been using FBOs to store stuff. The problem is, I attempt to resize them when I change resolution. I get no errors, however the ...
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1answer
28 views

Slick2D Graphics Misaligned

I'm working through a game in Slick2D and am now focusing on a lot of the graphical end. It's going pretty well other than a couple of issues with alignment. An image illustrating both of these issues ...
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2answers
43 views

How do find the right GLxx object for a given function in LWJGL?

I'm just starting to learn the fundamentals of OpenGL via LWJGL. Every OpenGL function is implemented as a method on a GLxx class. The xx corresponds to the version of the spec when that function was ...
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1answer
27 views

LWJGL Stencil shadow problem

I've a problem with shadow (Stencil). So when i draw the shadow they looks good, but when the object to draw is underground his shadow is wrongly rendered. My game is do with LWJGL/GL11. Normal ...
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2answers
43 views

How to setup glOrtho and Viewport [duplicate]

When setting up a window I set 6 variables in my render class int windowWidth; // the width of the window int windowHeight; //the height of the window int dimL; // the coordinate of ...
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1answer
79 views

Why would OpenGL ignore GL_DEPTH_TEST setting?

I cannot figure out why some of my objects are being rendered on top of each other. I have Depth testing on. glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); Do I need to draw by order of what is ...
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29 views

LWJGL 3 crashing on nglDrawArrays

I have 2 classes I'm trying to use to render a triangle, and it's crashing on nglDrawArrays, the error is in the native code, and the only information I'm getting from the JVM is a native error ...
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1answer
82 views

Why Is My AABB Collision Detection Not Working

I am going to be making a 3D game and I need to be able to test for accurate collision. I was able to get bounding sphere collision working (too inaccurate to be used for the whole game), but AABB ...
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2answers
214 views

Calculating Projectile Movement

I'm having some trouble putting together a method that will constantly move a "bullet" in the same direction accurately. Here is what I have so far public Vector3f moveFromPosition(Vector3f location, ...
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16 views

Projectile Motion in lwjgl with java [duplicate]

I was trying to make a game with a bow and arrow using lwjgl but I couldent get the arch right. I have a function called projectile that is updated once a frame for each arrow. my frame cap is at 60 ...
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2answers
253 views

How do I ensure my skybox is always in the background, with OpenGL?

I created a skybox in OpenGL (through LWJGL), but the only way I found to render it behind all objects was to make it very big. This leads to ugly edges between the 6 skybox planes. Optimally, I ...
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1answer
104 views

Fade into splash screen on game load

I'm using Slick2D and LWJGL for my StateBasedGame and I was wondering if there was a way to enter into my splashscreen on application load using a transition? I tried using: this.enterState(SPLASH, ...
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2answers
83 views

LWJGL Framebuffer Texture Problem

I am trying to get a terrain rendering system I wrote a while ago with LWJGL. This terrain rendering system is quite simple: a quad mesh is split as the camera moves closer to it, each time a new quad ...
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1answer
149 views

How could I implement 3D player collision with rotation in LWJGL?

I have a problem with my current collision implementation. Currently for player collision, I just use an AABB where I check if another AABB is in the way of the player, as shown in this code. (The ...
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1answer
131 views

NiftyGUI - Text isn't rendering

I am trying to create a gui with nifty on top of lwjgl. I've already had some problems during the Nifty setup, however now Nifty is set up and running correctly but for text rendering. Here is my xml ...
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154 views

Proper way to load pixel art textures for 2D graphics

I am working on developing a game using LWJGL which is the java bindings for OpenGl. I have just finished the code for loading and animating sprite sheets using a png and xml file. When the texture ...
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1answer
215 views

lwjgl and slick util text over textured quad

So, I load a TrueTypeFont like this: private TrueTypeFont trueTypeFont; try { InputStream inputStream = ResourceLoader.getResourceAsStream("assets/fonts/main.ttf"); Font ...
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1answer
80 views

Loading non-square textures, from a 256x256 spritesheet in lwjgl(JAVA)

so I'm doing lwjgl, so far I have the loading of 16x16 textures from a 256x256 spritesheet all working, using this code to get the location of the textures: public Vector2f[] calculateUVMapping(int ...
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109 views

JBullet quaternion to Euler angle conversion causes strange flipping behavior

I am making a game using JBullet (a Java port of C++'s Bullet library) for the physics and LWJGL for the graphics. However, JBullet measures angles in quaternions and LWJGL uses Euler or ...
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1answer
79 views

How can I make an soundsystem with slick?

My Question would be , how can I develop an easy-to-use Soundsystem under slick-util? Under the function a.playAsSoundEffect(1, 1, true, x, y, z); it allready works to create a static ...
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2answers
57 views

Add Objects in LWJGL without using glTranslationf function

It is possible to add an object in LWJGL without using translation function (glTranslatef) ? and if it is possible does this improve somehow performance ?
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1answer
69 views

When and how to apply affine translations to vertices of a mesh with LWJGL

So, I have a rigid body class, containing a list of vertices and a 4x4 transformation matrix. At the moment, I'm applying the transformation matrix to each vertex individually, and am unable to revert ...
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51 views

Slick2D changing image's color with drawFlash and using alpha

I have an image, where I have a round soft white feathered ball in the center of it. I plan to use it for my lighting in my 2D game. I could not find any proper way to drawing lighting with many ...
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128 views

Slick2D/LWJGL Drawing coloured lights problem

I am using the Slick2D engine. I've followed this snippet for creating light sources. I have followed step step, added what is actually important for me, and tested it and the lighting effects ...
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81 views

How to render multiple VBOs in LWJGL

I'm still trying to grasp the understanding of VBOs. When you create the floatbuffer, I was told if you keep adding to the put, you would get more points for a shape with more points. My problem is, I ...
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1answer
160 views

Collision between player and heightmap

Im programming a small project, an opengl height map. It is build of triangles, which points are fit to the right y position (read out of an image). The player is represanted by a cuboid. (p1, p2, ...
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88 views

Using VBOs for the begginer

I've spent the past 10 hours trying to understand this and couldn't get any good help. I whatched a youtube video on VBOs and have whatched it many times and tried many things, but I STILL DON'T GET ...
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61 views

(LWJGL)How would a game patch work

I made a game in java that I plan on selling some day. When I do eventually release it,I want people to receive patches instead of buying it again. How does a game patch work, and where the heck do I ...
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1answer
237 views

LWJGL/Java - Implementing a writeable text box?

I would like to create a writeable text box where a user can input text into it. A nice "send" button that the person could click to send the text to the server would also be nice. I currently haven ...
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2answers
249 views

How to achieve a Gaussian Blur effect for shadows in LWJGL/Slick2D?

I am currently trying to implement shadows into my game, and after a lot of searching in the interwebs I came to the conclusion that drawing hard edged shadows to a low resolution pass combined with a ...
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1answer
51 views

Slick UnicodeFont displays in different location depending on the screen size?

I am using the Slick2D library to draw text. The text draws perfectly, however it is in the wrong location! I could easily draw it in the correct location, however the problem is that the "correct ...
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1answer
101 views

What is “immediate mode” in LWJGL?

I am not sure what "immediate mode" is in the context of LWJGL. I think it's when you use gluPerspective() function?
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1answer
110 views

Get stick analogue XY position using Jinput in lwjgl

I want to capture the movement of the analogue stick of the gamePad. is there any equivalent function to this? public void mouseMoved(MouseEvent mouseEvent) { mouseEvent.getX(); //return the X ...
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1answer
87 views

How do I put different textures on different walls? LWJGL

So far I have it so you are running around in a box, but all of the walls are the same texture! I've loaded up other textures for the walls (I want the walls a different texture than the floor) but it ...
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2answers
45 views

glViewport like camera

I'm using glViewport as a camera of sorts, but I'm not quite sure how it works. For example when I change do: glOrtho(0, 800, 600, 0, -1, 1); glViewport(0, 0, 400, 200); It makes the viewing area ...
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1answer
114 views

How to make a sidescrolling effect in lwjgl

I use the following methods and the screen moves away from the player. glTranslatef(h.x - width/2, h.y - hieght/2, 0); if ((Keyboard.isKeyDown(Keyboard.KEY_D))) { h.x += 10; ...
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1answer
69 views

Blending issue with framebuffer

I'm trying to get some particles to work properly - they should blend among themselves but not with the background color. For this I'm using additive blending, textures with premultipled alpha and set ...
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2answers
69 views

Why does my side-scroller character move in the wrong direction?

I'm trying to understand why my rectangle moves in the opposite direction I want it to. I have a float for translation: glTranslatef(translate_x, 0, 0); if ...
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1answer
108 views

How to load resources in LWJGL [duplicate]

I've been searching for days. When I export and create my fat jar it loads and disappears. It can't find my images. This is what it all looks like. I used something like this to load them: File a; ...
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4answers
300 views

Are VBOs only for OpenGL 3.x?

Are VBOs only for OpenGL 3.x? I'm using immediate mode and I know it's bad, slow, and deprecated. But then I looked at display lists but they are deprecated too. I guess the VBO is the only one left ...
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1answer
118 views

(LWJGL) Exporting Textures with JarSplice [duplicate]

I have another game that uses rectangles instead of textures and works just fine. when I run this I get this error: Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. ...
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1answer
85 views

Jagged text + additive blend in openGL

I am having some trouble understanding how openGL blend modes work. At first I was using glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) and it all looked fine except that I couldn't use any ...
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60 views

How to create a 2D overlay over a 3D game? (LWJGL/OpenGL) [duplicate]

GameDev! I would like to create a 2D overlay over a 3D world, using LWJGL (Java version of OpenGL), to show information to the player, for example, a chat box, health bar, selected cannonball type, ...
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1answer
371 views

Shadow map: depth texture always returns 0

I'm implementing a shadow map for the sun light in my voxel engine using a depth texture attached to a framebuffer. But when I sample the depth texture during the normal pass, the value returned is ...
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1answer
377 views

What alternatives are there for creating Keyboard/Mouse controls in LWJGL?

So I'm currently working my way through openGL tutorials, using LWJGL to do all my work in. However as I get to the part on how to access Keyboard and Mouse events in this library, I stumble across ...