[SOLVED] Loading tiles from texture atlas problem

[Raindeer]

Hello!

I'm new to these forums and I have run into a problem. I can load the sprites from the atlas completely fine, but the problem occurs when I try to bind the BufferedImage texture, which is not supported. So, I load the atlas, get the subimages but I can't bind them as textures. Is there a way to convert a BufferedImage to a working texture without 500 packages of premade code? Well, if you have any good solutions for this problem it'll certainly be appreciated.

Thank you.

[Fool Running]

I think you misunderstand how to use a texture atlas in OpenGL. You create an OpenGL texture using the whole atlas. Then you just adjust the texture coordinates used to select the parts of the atlas making up the sprite.

If you need a simple, easy-to-use texture loader, I would suggest the one in Slick Utils: http://slick.ninjacave.com/slick-util/

[Raindeer]

I think you misunderstand how to use a texture atlas in OpenGL. You create an OpenGL texture using the whole atlas. Then you just adjust the texture coordinates used to select the parts of the atlas making up the sprite.

If you need a simple, easy-to-use texture loader, I would suggest the one in Slick Utils: http://slick.ninjacave.com/slick-util/

I actually did that as a placeholder, but things didn't work out quite well. The sprites interfere with each other, the edges' colors mix together and it looks really bad. And I am using slick utils. The sprites are 16x16 and are set to GL_NEAREST, pixelated textures, like in Minecraft. Dunno if the sprite resolution has anything to do with it.

[Raindeer]

This is the code for drawing a cuboid.

import org.lwjgl.opengl.GL11;

public class PolyVoxel extends Poly {

	float x1, y1, z1, x2, y2, z2, centerX, centerY, centerZ;
	float width, height, length;
	float yTop, yBottom;
	private float tx1, ty1, tx2, ty2;
	private int textureX, textureY;
	
	public PolyVoxel(float startX, float startY, float startZ, float endX, float endY, float endZ, int spriteX, int spriteY) {
		x1 = startX;
		y1 = startY;
		z1 = startZ;
		x2 = endX;
		y2 = endY;
		z2 = endZ;
		
		width = x2 - x1;
		height = y2 - y1;
		length = z2 - z1;

		centerX = x1 + (width/2);
		centerY = y1 + (height/2);
		centerZ = z1 + (length/2);
		
		textureX = spriteX;
		textureY = spriteY;
		
		tx1 = (float) spriteX / 32f;
		ty1 = (float) spriteY / 32f;
		
		tx2 = tx1 + (1f / 32f);
		ty2 = ty1 + (1f / 32f);
		
		System.out.println(String.format("%s, %s, %s, %s", tx1, ty1, tx2, ty2));
	}
	
	public void render() {
		GL11.glBegin(GL11.GL_QUADS);
		{
			//top
			GL11.glTexCoord2f(tx1, ty1);		GL11.glVertex3f(x1, y1, z1);
			GL11.glTexCoord2f(tx2, ty1);		GL11.glVertex3f(x1+width, y1, z1);
			GL11.glTexCoord2f(tx2, ty2);		GL11.glVertex3f(x1+width, y1, z1+length);
			GL11.glTexCoord2f(tx1, ty2);		GL11.glVertex3f(x1, y1, z1+length);
			
			//bottom
			GL11.glTexCoord2f(tx1, ty1);		GL11.glVertex3f(x1, y1+height, z1);
			GL11.glTexCoord2f(tx2, ty1);		GL11.glVertex3f(x1+width, y1+height, z1);
			GL11.glTexCoord2f(tx2, ty2);		GL11.glVertex3f(x1+width, y1+height, z1+length);
			GL11.glTexCoord2f(tx1, ty2);		GL11.glVertex3f(x1, y1+height, z1+length);
			
			//front
			GL11.glTexCoord2f(tx1, ty1);		GL11.glVertex3f(x1, y1, z1);
			GL11.glTexCoord2f(tx2, ty1);		GL11.glVertex3f(x1+width, y1, z1);
			GL11.glTexCoord2f(tx2, ty2);		GL11.glVertex3f(x1+width, y1+height, z1);
			GL11.glTexCoord2f(tx1, ty2);		GL11.glVertex3f(x1, y1+height, z1);
			
			//back
			GL11.glTexCoord2f(tx1, ty1);		GL11.glVertex3f(x1, y1, z1+length);
			GL11.glTexCoord2f(tx2, ty1);		GL11.glVertex3f(x1+width, y1, z1+length);
			GL11.glTexCoord2f(tx2, ty2);		GL11.glVertex3f(x1+width, y1+height, z1+length);
			GL11.glTexCoord2f(tx1, ty2);		GL11.glVertex3f(x1, y1+height, z1+length);
			
			//left
			GL11.glTexCoord2f(tx1, ty1);		GL11.glVertex3f(x1, y1, z1);
			GL11.glTexCoord2f(tx2, ty1);		GL11.glVertex3f(x1, y1, z1+length);
			GL11.glTexCoord2f(tx2, ty2);		GL11.glVertex3f(x1, y1+height, z1+length);
			GL11.glTexCoord2f(tx1, ty2);		GL11.glVertex3f(x1, y1+height, z1);
			
			//right
			GL11.glTexCoord2f(tx1, ty1);		GL11.glVertex3f(x1+width, y1, z1);
			GL11.glTexCoord2f(tx2, ty1);		GL11.glVertex3f(x1+width, y1, z1+length);
			GL11.glTexCoord2f(tx2, ty2);		GL11.glVertex3f(x1+width, y1+height, z1+length);
			GL11.glTexCoord2f(tx1, ty2);		GL11.glVertex3f(x1+width, y1+height, z1);
		}
		GL11.glEnd();
	}
	
	public int getTextureX() {
		return textureX;
	}
	
	public int getTextureY() {
		return textureY;
	}
	
	public void setTexture(int texX, int texY) {
		textureX = texX;
		textureY = texY;
		
		tx1 = (float) texX / 32f;
		ty1 = (float) texY / 32f;
		
		tx2 = tx1 + (1f / 32f);
		ty2 = ty1 + (1f / 32f);
	}

}

So the edges of the textures interfere, mixing the colors up. Here's the spritesheet:



And makes it turn out like this:

[Raindeer]

The problem was somewhere else... The jpg format made the spritesheet quite low quality.. dangit.