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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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
217 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
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 ...
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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 ...
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1answer
197 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
446 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
216 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
111 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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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, ...
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1answer
704 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
581 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 ...
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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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1answer
431 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 ...
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1answer
239 views

Structure gameobjects and call events

I'm working on a 2D tile based game in which the player interacts with other game objects (chests, AI, Doors, Houses etc...). The entire map will be stored in a file which I can read. When loading the ...
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1answer
125 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 ...
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1answer
855 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 ...
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1answer
147 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() == ...
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2answers
89 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. ...
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1answer
33 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, ...
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1answer
403 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 ...
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1answer
429 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 ...
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1answer
422 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 ...
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2answers
681 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 ...
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1answer
359 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" ...
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2answers
215 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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0answers
107 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 ...
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2answers
240 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 ...
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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 ...
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1answer
221 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
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1answer
352 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 ...
3
votes
1answer
2k views

Using gluUnProject to transform mouse position to world coordinates (LWJGL)?

I have a little LWJGL application and I have been trying to figure out how to successfully use the GLU.gluUnProject function in order to transform a given point on the screen (mouse position) to world ...
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2answers
206 views

Slick2D: constructor vs. init method

What is the difference between the constructor of a BasicGameState and the init method? It appears that they are both called at the same time when the BasicGameState is registered in StateBasedGame, ...
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1answer
588 views

LWJGL SlickUtil Texture Binding

I am making a 3D game using LWJGL and I have a texture class with static variables so that I only need to load textures once, even if I need to use them more than once. I am using Slick Util for this. ...
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0answers
246 views

LWJGL Rotating is moving

I am trying to rotate my QUAD even just a little bit. I have read pages like http://www.java-gaming.org/topics/lwjgl-tutorial-series-moving-and-rotating-triangle/30679/view.html In my render() ...
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1answer
121 views

Slick2D: Initializing graphics object before game loop

I'm using the Slick2D Java game library and I want to set the scale of the graphics object that gets passed to the render method in my game loop. I'd like to do this outside the render method, so ...
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2answers
98 views

LWJGL Jumping Down [closed]

I'm currently building a little game using LWJGL, and I got a Game class which contains my game loop, instances etc... And a Player class which contains a constructor (for x and y coords), logic ...
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1answer
1k views

How do I move the camera in 2D LWJGL openGL?

I am making a top-down rpg game with the LWJGL but I can't figure out how to make the camera follow the player. I've tryed using GLU.gluLookAt() but it seems to be designed for 3D and when I try it ...
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0answers
382 views

Shadow mapping implementation not working? [closed]

I am trying to implement Shadow Mapping in my program using Java/LWJGL/OpenGL/GLSL, but I cannot get it to work properly. Let's start off with a screenshot first, then the relevant code and lastly ...
0
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1answer
666 views

LWJGL Adding Textures with VBOs

I'm currently trying to texture a cube, but I am having no luck determining what the next step should be. I can load an .obj model from Blender into my LWJGL program just fine, and I can even make a ...
0
votes
1answer
107 views

How can I create a cross-fade between two quads?

I have two quads, and I would like to have each one of them on the screen for 5 seconds, then fade to the next one. How could this be done? My code: package net.makerimages.Unacrawl.stateSys; ...
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0answers
263 views

LWJGL Translation Problems with Matrix4f Class

I've just implemented a simple 3D Camera into my current game program using matrices and shaders. (I've basically just implemented the simple camera found here: ...
0
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1answer
865 views

LWJGL Camera Rotation Issues

I am quite new to LWJGL and OpenGL and I am trying to create an FPS camera. I had no problem with 2D stuff, so I decided to step things up and try and make some things in 3D. I have this 3D camera ...
0
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1answer
299 views

2D Tiled Map - Small tiles or big tiles with pixel-precise movement

I am using Java - LWJGL - Slick2D . I have tried to do a proper collision detection with 32 x 32 tile size but failed three times. I just cant get it to work! I found a youtube video that was using ...
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vote
1answer
134 views

Telling my shader when to use which Texture

So I've just managed to get Texturing via GLSL shaders to work and i can pass a sampler2d textureHandler + my uv coordinates into my shader to specify the texture to be displayed on my Tiles. Now im ...
8
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3answers
7k 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 ...
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0answers
42 views

Should tiles in a tile-based game draw themselves? [duplicate]

I'm a beginner in game programming, and I want to start with Java (in which I have a strong background I think) and LWJGL. I want to create tile-based games. Let's say I have an object named Tile, ...
0
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3answers
554 views

How can I move a created Image in Slick2D?

I want a image to follow the mouse, and I use Image class of Slick 2D: public void init(GameContainer gameContainer, StateBasedGame stateBasedGame) throws SlickException { mouseImage = new ...
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3answers
414 views

How can I access LWJGL's Keyboard from a thread other than the graphics thread?

I'm loving LWJGL, but have been running into a number of odd problems with it. Most of it seems to deal with the fact that OpenGL is a state-machine and was only ever meant to be accessed from a ...
0
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1answer
415 views

LWJGL Collision Detection

I cannot find LWJGL collision detection with a camera and walls. Like making it to where you can not walk through walls and other different shaped rectangular prisms and cubes. How do I set up LWJGL ...
0
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1answer
599 views

Break a learning barrier with Java + LWJGL [closed]

I have been coding with Java and LWJGL for some time. I mainly use thebennybox's tutorials, but I can't always remember the 3D rendering. But even when I have a 3D rendering models, planes, cubes, ...