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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12
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1answer
1k views

OpenGL - white edges on cubes

In a minecraft-like game I'm making, I get white edges on my cubes: It is much more noticeable in darker textures. The textures are being setup like this: glTexParameteri(GL_TEXTURE_2D, ...
0
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1answer
219 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 ...
0
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0answers
217 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 ...
0
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1answer
473 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 ...
0
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2answers
1k views

How to create texture coordinates for a spritesheet with lwjgl

Using lwjgl and slick-util I've been trying to use certain pieces of a spritesheet as textures. lwjgl uses glTexCoord2f(); to map coordinates to individual vertices, and the coordinates it takes in ...
0
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1answer
125 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 ...
0
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1answer
108 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 ...
1
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1answer
567 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 ...
7
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2answers
1k views

What causes some computers to have no or slow OpenGL, and how to fix it?

I am using Java with JOGL to create OpenGL enhanced 2D graphics. The graphics operations I use are nothing fancy, and should be supported by almost any recent graphics card. For example, my game ...
0
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1answer
347 views

(LWJGL) Pixel Unpack Buffer Object is Disabled? (glTextImage2D)

I am trying to create a render target for my game so that I can re-render at a different screen size. But I am receiving the following error: Exception in thread "main" ...
0
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0answers
101 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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0answers
75 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 ...
6
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1answer
447 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 ...
0
votes
1answer
417 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 ...
0
votes
1answer
71 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
122 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?
-1
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1answer
118 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 ...
0
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2answers
66 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 ...
0
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1answer
209 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; ...
0
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1answer
93 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 ...
0
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2answers
71 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 ...
-1
votes
1answer
188 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; ...
0
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0answers
275 views

Adding 2d hud/gui to a 3d game engine which has no 2d features

I have been following the 3d game engine tutorial series made by theBennyBox for a few months now, and have finally decided to create a game with it. My problem is that it is a 3d only engine which ...
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vote
4answers
437 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 ...
0
votes
1answer
208 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. ...
0
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1answer
109 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 ...
1
vote
1answer
672 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 ...
2
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0answers
374 views

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

I'm getting the following error: java.io.IOException: Attempt to allocate a texture to big for the current hardware at ...
0
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0answers
63 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, ...
5
votes
2answers
647 views

Are display lists faster than VBOs?

I'm making a voxel rendering engine. My "chunks" are 32 * 32 * 256 blocks and I can render a 16 * 16 square of them (which corresponds to Minecraft's maximal render distance). I'm using VBOs holding ...
0
votes
1answer
415 views

App using LWJGL can't find display mode extension on Linux

I'm running LWJGL app on Ubuntu virtual machine with no phisical graphic card. I set up Xvfb and Mesa3D but it fails with exception java.lang.ExceptionInInitializerError: null at ...
0
votes
1answer
146 views

LWJGL - Keyboard.next() not firing

I am trying to make a class which will handle all of my inputs, however Keyboard.next() isn't returning true. Here is my code. while(Keyboard.next()) { if(Keyboard.getEventKey() == ...
0
votes
1answer
124 views

Why does my character move up forever when he jumps with this code?

I've been doing some stupid stuff in Slick2D+LWJGL and I've run into a problem. I press the UP arrow and my character continues to go up until I let go :/ Here's the code: if ...
8
votes
3answers
6k views

How do I render a PNG with transparency in LibGDX?

I'm building a simple tic-tac-toe example with LibGDX. I have simple images: cross, circle and board, all pngs created with GIMP with a transparent background. How can I render them as a Texture with ...
0
votes
1answer
796 views

LWJGL Resize window and glTranslate breaking screen resolution

I'm trying to make a 2D Tile RPG game with LWJGL but I'm having a problem with the display resizing. I want the user to be able to re-size the window to whatever size they want just by expanding it ...
0
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2answers
364 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
votes
2answers
151 views

Can I use multiple OpenGL version together

I want to use GLSL but keep my current OpenGL 1.1 setup. The thing is that can I use OpenGL 2.0 shaders on OpenGL 1.1 renders?
12
votes
1answer
11k views

Making a HUD/GUI with OpenGL (LWJGL)

I'm at the stage in my game development where I need to make a HUD or GUI. I've never gotten to this part, so I don't know how its done. I tried rendering a simple quad at a fixed position on the ...
0
votes
2answers
88 views

Clamping large content to smaller area

I'm using OpenGL (with LWJGL) in Java, but the question is language independent. I have some region (a rectangle for simplicity), and, let's say, a big tiled map which I want to show in this area. ...
0
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1answer
32 views

lwjgl slick textures and glTexParameter

How to make textures fill all area as it is specified? I'm getting small gaps if the texture is smaller than area example: gl_quads setup like these: -1f, 1f, 0, -0.98f, 1f, 0, -0.98f, -1f, 0, ...
0
votes
1answer
387 views

Getting the Ray position from View and Projection Matrix

I'm having some trouble calculating the direction and position of the ray from my matrices. I have tried some things such as: private Vec3 getPick(Mat4 projection, Mat4 view) { Mat4 ...
0
votes
1answer
414 views

Correct GL settings to mix 2D and 3D rendering

I'm programming a 3D game engine with 2D GUI. The GUI objects have partially transparent textures and the transparency works more or less. The sky color is rendered in transparent areas of the ...
1
vote
1answer
405 views

How to use LWJGL Vertex Buffer Objects?

I have been learning how to make a game with LWJGL for a while now by following YouTube tutorials online but I've recently been having a problem understanding Vertex Buffer Objects. I've looked at ...
5
votes
1answer
1k views

What's the best way of drawing a glowing 3d line using LWJGL?

Sort of like a strip-light effect; not actually a light source, but just a polygon with glowing edges. Can this be done easily? Right now I'm contemplating drawing a line more than once with varying ...
0
votes
2answers
209 views

How do I merge quads to simplify a heightmap?

I'm trying to improve my frame rates. My map has an area of 200 * 200 vertices, where each vertex has a height. 200 * 200 = 40000 vertices per frame. I'd like to create a method to simplify the ...
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2answers
235 views

GL ARB Shadow Ambient Extension is not supported

I'm trying to build a game engine with LWJGL under Java. I'm want to implement Shadowmapping, but I'm stuck with the tutorials from Oskar Veehoek (here, specifcally). When I try to use the shadow ...
0
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0answers
105 views

how to do picking in 2d lwjgl

I searched the whole internet, but I couldn't find something useful. How to do picking (like ray picking) in lwjgl in orthographic mode (2d)? I think this is less confusing than picking in 3d, but I ...
0
votes
1answer
220 views

How to change colors of texture in lwjgl? [duplicate]

I have the following texture: The black pixels are characters, the background is transparent. How do I change the black pixels of the characters to another color? I use this texture as a bitmap for ...
0
votes
1answer
1k views

Why do I get “function not supported” exceptions for OpenGL 3.2 functions using LWJGL?

I am currently having an issue trying to initialize a frame buffer using LWJGL. When I try to call GL32.glFramebufferTexture(int, int, int, int) it throws a "Function is not supported" error. I have ...
0
votes
1answer
348 views

(LWJGL) Resize window content [closed]

I am having a little issue with my game trying to get the screen to draw a ton larger. I am going for a retro type of feel for my game and I believe that this would help with that. I am basically ...