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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How do I get the alpha level at a specific pixel with Slick 2D?

I know that there is the Texture.getTextureData() method, and that it returns a byte[], but I have no idea how I could use this data to find the color data at a specific pixel.
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2answers
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Texture antialiasing?

In my Minecraft-clone style game, blocks are textured with a border that is lighter then the block color. See picture below: To achieve this effect without the textures being blurry I use this code:...
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1answer
375 views

How do I determine if a tile is a slope based on the tile image?

In my game, every tile is a 32x32 texture. All the slopes are a 0 - 45 degree angle. I would like to determine, at the time I load the tile, if the is sloped by examining its texture/bitmap data. How ...
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1answer
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Ray picking - get direction from pitch and yaw

I am attempting to cast a ray from the center of the screen and check for collisions with objects. When rendering, I use these calls to set up the camera: GL11.glRotated(mPitch, 1, 0, 0); GL11....
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1answer
925 views

Need some help implementing VBO's with Frustum Culling

i'm currently developing my first 3D game for a school project, the game world is completely inspired by minecraft (world completely made out of cubes). I'm currently seeking to improve the ...
8
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2answers
637 views

What is the primary use of Vertex Buffer Objects?

From what I've read, it seems VBOs are purely for performance. I'm working on a very rudimentary learning project in lwjgl and I'm just trying to figure out what more advanced features of the library ...
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1answer
277 views

Frame Buffer Objects vs calling TexCoord2f?

I'm learning the basics of OpenGL with lwjgl currently, and following a guide I've got textured quads that can move around a scene. I've been reading about Frame Buffer Objects, and I'm not really ...
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2answers
399 views

How does this snippet of code create a ray direction vector?

In the Minecraft source code, this code is used to create a direction vector for a ray from pitch and yaw:' float f1 = MathHelper.cos(-rotationYaw * 0.01745329F - 3.141593F); float f3 = MathHelper....
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3answers
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How can I make OpenGL textures scale without becoming blurry?

I'm using OpenGL through LWJGL. I have a 16x16 textured quad rendering at 16x16. When I change it's scale amount, the quad grows, then becomes blurrier as it gets larger. How can I make it scale ...
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3answers
9k views

Packaging Jar with External Libraries in Eclipse

I have a class called Game in the package net.aGameName and am trying to export a runnable Jar using eclipse. In the project I have two external Jar files added, lwjgl.jar and lwjgl_util.jar. When I ...
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1answer
519 views

vector collision on polygon in 3d space detection/testing?

In the 3d fps in java I'm working on, I need a bullet to be fired and to tell if it hit someone. All visual objects in the game are defined through OpenGL, so the object it can be colliding with can ...
4
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1answer
394 views

Restricting Camera Movements with OpenGL

I've been programming a game using the Java library LWJGL. I've got a little problem, though. It is a 2D game, and I'm aiming for a game like the original Civilization (I quick Google of "Civilization ...
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3answers
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Rendering only what is on the screen

I am fairly new to this world, so bear with me. I have a grid of blocks in a top-down, 2d game written using Slick. The best way to think of it is the Pokemon world. Right now, I am rendering all ...
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vote
1answer
933 views

LWJGL Rendering a 2D Object at a Certain Position On-Screen

Okay, so in LWJGL, how can I render a 2D object (maybe for like a menu, or meter that shows up on screen during the game), and have control over size and position on screen? So I can tell it what ...
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2answers
1k views

LWJGL Determining whether or not a polygon is on-screen

Not sure whether this is an LWJGL or math question. I want to check whether a shape is on-screen, so that I don't have to render it if it isn't. First of all, is there any simple way to do this that I ...
3
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1answer
958 views

Is there any way to get the HWND from a window in LWJGL?

I've started some experimentation in Java and LWJGL (via Slick), and it seems very solid. However, I have some legacy code that requires a HWND integer as a parameter. I'm not sure how I'd be able to ...