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.

learn more… | top users | synonyms

1
vote
1answer
49 views

How can I rotate a quad around it's center?

My code is: GL11.glPushMatrix(); // rotate around center GL11.glTranslatef(-200/2, -200/2, 0); GL11.glRotatef(30, 0.0f, 0.0f, 1); GL11.glTranslatef(200/2, 200/2, 0); // draw quad ...
1
vote
1answer
134 views

How can I blend up to 3 textures on a polygon without blend maps?

For my voxel game I need to blend up to 3 textures in the same polygon. It would be preferable if I could specify a texture id for each vertex, but other solutions are accepted as well. Here's an ...
0
votes
0answers
102 views

Vertex Skinning OpenGex Incorrect Transformations

I'm following the formula here, I'm using LJWGL, OpenGl, OpenGex, and Blender: I implemented the code and it works but there is a few things. First, there is a gap between the two bones, or on each ...
2
votes
2answers
253 views

Unknown length of primitive array

For my Voxel like game I need to generate terrain meshes from an array of ids. Because of that I have no idea how big the final vertex array will be. Currently I'm doing like this: generate mesh and ...
0
votes
0answers
78 views

LWJGL OpenGL Spotlight half-showing

Problem: Only half of the light is showing. Lighting Inilization code: glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); glEnable(GL_NORMALIZE); ...
0
votes
0answers
48 views

How can I render several rectangles efficiently? (LWJGL)

I'm working with OpenGL3+ rendering and I am coming from OpenGL1.5. In GL1.5 I had rendered things like this: public class GraphicsDead { int vboVertexHandle; int vboColorHandle; public ...
1
vote
1answer
131 views

How can I manipulate a single pixel with LWJGL?

This is a very simple question. Is there a way to manipulate a single pixel? Here's an example of what I want in pseudo-code: while(gameIsOn) { renderAllObjects(); setPixel(x,y,r,g,b); } ...
0
votes
1answer
51 views

LWJGL Lighting advice / fix

Problem: The spotlight I've set up with OpenGL won't light up anything behind it, no matter what values I set for GL_SPOT_DIRECTION float[] LightDir = new float[]{0,0,-1,0}; float[] ...
1
vote
1answer
86 views

Drawing text with Slick

I've been trying to draw a text to the display using Slick. However, when ever I draw the TrueTypeFont to the screen, it draws it reversed upside down and also, it makes the whole display turn black. ...
0
votes
0answers
78 views

OpenGL camera scrolling too fast

I'm using the code from this tutorial but in Java and LWJGL. The problem is I want the player to click and drag around the world with the mouse. I tried adding the mouse dx (velocity) to the camera ...
0
votes
1answer
123 views

Free camera rotation in 3D space

I'm using a view matrix to do camera movement and rotation. viewMatrix = new Matrix4f(); viewMatrix.setIdentity(); Matrix4f.rotate((float) Math.toRadians(rx), new Vector3f(1,0,0), viewMatrix, ...
3
votes
1answer
461 views

Drawing fonts with LWJGL3 with OpenGL

I'm very sorry if this question has already been answered, but since I've been struggling with this for many days I thought I'd give it a shot here. My goal is to somehow render some text on the ...
0
votes
1answer
78 views

AABBs in lwjgl 2.9.3

I think I have succeeded in making an aabb out of 6 quads in opengGL but how would i get it to stay with its centre-point at the centre-point of all objects. I know it is easy for one object how would ...
1
vote
2answers
214 views

Rotating a swinging sword in LWJGL gives wierd results

I'm making a 2d top down game in Java using LWJGL(OpenGL, essentially). I recently tried adding a swinging sword mechanism. My coordinate system is set to the bottom left FOR ALL objects. The rotation ...
1
vote
2answers
110 views

Making an organized rendering class [closed]

I'm using LWJGL (opeengl wrapper for Java) and Don't know how to make a renderer class for OpenGL. So In Immediate mode rendering I'd do a method like this to draw quadralaterals. public static void ...
2
votes
1answer
68 views

JBullet - How can I make my object float on the water?

I'm trying to use JBullet for a ship PVP game. I've got two ships which are meant to rest on the water. Obviously these ships will be colliding, but the problem I have currently is "water" ...
0
votes
1answer
88 views

Opengl textures change color of everything

Whenever I render textures, all shapes get the color of the texture. I'm not sure why, but I think it's something to do with the way I render textures. Here's what I use to draw textures: public void ...
0
votes
0answers
620 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() ...
0
votes
1answer
99 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 ...
-1
votes
1answer
43 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; ...
0
votes
0answers
162 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). ...
-1
votes
1answer
610 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 ...
0
votes
1answer
101 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 ...
5
votes
2answers
420 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 ...
1
vote
1answer
68 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 ...
1
vote
1answer
96 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 ...
1
vote
1answer
237 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, ...
1
vote
1answer
270 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 ...
0
votes
0answers
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 ...
-2
votes
1answer
158 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 ...
0
votes
0answers
85 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 ...
1
vote
1answer
169 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 ...
0
votes
1answer
227 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 ...
0
votes
1answer
113 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 ...
2
votes
2answers
284 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 ...
0
votes
1answer
128 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. ...
2
votes
1answer
148 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() ...
0
votes
1answer
151 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 ...
0
votes
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 ...
0
votes
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 ...
2
votes
2answers
64 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 ...
0
votes
1answer
83 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 ...
0
votes
2answers
457 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 ...
1
vote
1answer
236 views

Delta time not accurate enough

In my game i have a delta timer based almost exactly on the page from here http://wiki.lwjgl.org/index.php?title=LWJGL_Basics_4_%28Timing%29 But if the the main loop is fast enough, my delta time ...
1
vote
1answer
166 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 ...
-1
votes
1answer
135 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 ...
0
votes
3answers
707 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, ...
0
votes
0answers
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 ...
1
vote
2answers
580 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 ...
0
votes
1answer
253 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, ...