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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Opengl camera handling

I normally do parallax scrolling with x and y which works, but I'd like to make a camera class instead so I can rotate as well. Right now the camera is set to the player's position but doesn't scroll. ...
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488 views

How to toggle fullscreen with lwjgl

I'm using glfw in lwjgl-3 to try to create a toggleFullscreen method. However it always gives me errors. I saw this question Toggle Fullscreen at Runtime but it didn't help because glfwOpenWindow() ...
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1answer
88 views

Handling collision with LWJGL rectangles

I'm testing collision with other rectangles so I can implement it into my current project. The problem is the rectangle starts at the right x and y, but I'm not sure where exactly they are. I'm pretty ...
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1answer
40 views

Scrolling is going too fast

I used delta based off the LWJGL tutorials and it works (I get 16 or 17 delta) but everything is scrolling nonstop. Here's how I render things: public class Game { int camX; int camY; ...
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140 views

Trouble with Raycast Selection using OpenGL

I am currently having trouble with a custom model editor in which I want to implement model selection (eventually featuring face selection to have something like "click-and-drag" to extend the cubes). ...
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1answer
432 views

What is the difference between .obj files and Collada files? [closed]

I am currently making a game in java using LWJGL 2.9 and I am wondering what the difference between the .obj format and .dae format is. Currently I can load .obj files and would like to load .dae ...
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24 views

Stack matrix affecting shooting mechanics

I attempted to make a scroller game using parallax scrolling in LWJGL. Everything is fine but I'm having trouble with the matrix stack and the bullets. So basically when I shoot the bullet it moves ...
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1answer
91 views

How can I split up a large model into an octree codewise?

For collision detection, I am attempting to split up a large model into an octree. If we take this black thing thing to be the ship (104,000 vertices): Then I would like to split up the faces I ...
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28 views

LWJGL: getDisplayModes() on Linux with two monitors

When calling getDisplayModes() on a Linux machine with two monitors I only get one single resolution, that is, the current resolution set on the main monitor. However, calling xrandr directly gives me ...
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2answers
381 views

How does glRotate affect the axes of the global coordinate system?

I am currently playing around with 3D transformations applied on a 2D context in LWJGL, to later be implemented in my game. So I managed to set up LWJGL well enough (scaling, translating, scaling and ...
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1answer
62 views

Slick2D crashes on Image.getGraphics() on some machines

On some machines, creating a new Image and calling getGraphics() on it causes lwjgl to enter into some kind of faulty state that crashes when swapping buffers. Any idea what causes this and how to ...
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1answer
85 views

How to distort graphics in a wave-like way?

I saw a certain graphics distortion effect on multiple games over time and am interested in doing it in 2D. It is like a wave-like texture distortion, I am not entirely sure what it is called ...
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1answer
197 views

FBO and VBO for performance

I discovered VBO's recently and changed my code to use them instead of immediate mode. Now I'm rendering 25000 squares and it's really slowing down my FPS. If I drew all the squares VBO's to an FBO, ...
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1answer
227 views

OpenGL/GLSL/LWJGL return value from shader

I'm trying to do some bone animation. I don't want the whole skeleton to be loaded to the GLSL shader every time, even tough it's not needed, because one vertex is parented to one bone, not more. My ...
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13 views

How can I implement a “horizontal desynced colors” effect in LWJGL? [duplicate]

My plan is to achieve analog video effects like RGB channel desynchronisation. I'd like to have something like this (I hope you get the idea): Left: White dot; Right: The same dot, but mind the ...
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1answer
144 views

How can I get “Good enough” collision for entities? [closed]

I am developing a Pirate ship fighting game. It's a great concept: Ships firing cannonballs, sinking each other, having to work as a team to complete the mission... But.. I've tested it with about ...
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77 views

Lwjgl Textures Overriding true type font

I am making a game in java but I recently came across a problem when I bound my textures, my true type fonts would start copying the texture and i would just see a wall of color where my words had ...
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1answer
148 views

Java JBullet Mesh collsion problem

I have a problem with JBullet mesh collsion. Everything works fine when I create a mesh from my object without scaling, but the problem starts when I want to scale the object. I also tried scaling in ...
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1answer
199 views

Java LWJGL - How can I add water to my 3d world? [closed]

The title says it all, how can I implement a simplistic water system into my game? I am using Java LWJGL and OpenGL glsl shaders. I am still fairly new to game programming, and a complete noob in the ...
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1answer
110 views

Java LWJGL - Monster follow script not working properly

I have written a script to be set off whenever a player is within a distance of the monster. The script checks if the x position is greater than or less than the players x, and same for the z. (y is ...
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2answers
235 views

How does rendering with Swing compare to rendering with openGL?

[summary: Is the performance of Swing at least in the same dimension as openGL [through LWJGL]? If yes, what percentage would you give it? What possible other problems can I expect from Swing in the ...
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1answer
123 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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1answer
143 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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1answer
127 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
2k 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
47 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
63 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
70 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
388 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
143 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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1answer
130 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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3answers
652 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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20 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
529 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
216 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
122 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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2answers
505 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
263 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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1answer
603 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
154 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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1answer
149 views

How can I make an soundsystem with Slick?

My question would be, how can I develop an easy-to-use sound system under slick-util? Under the function a.playAsSoundEffect(1, 1, true, x, y, z); it already works to create a static position for ...
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2answers
97 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
134 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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1answer
411 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

(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
543 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
502 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
85 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
133 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
234 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 ...