Sprite Sheet Help

[wxwsk8er]

Hey guys,

This is my first post so please let me know if I do anything wrong  .

I am making a, yes another, minecraft clone. I am in imediate mode, and need some help with sprite sheets. I am using a sheet (attached) and it has sprites of the block textures 16x16 px.

The problem is that when I bind the subimage it renders the entire sheet.

Heres my code (need to clean it up, after I get it working  )

import java.io.FileInputStream;
import java.io.IOException;

import org.newdawn.slick.Image;
import org.newdawn.slick.SlickException;
import org.newdawn.slick.SpriteSheet;
import org.newdawn.slick.opengl.TextureLoader;

public class SpriteSheetManager {
	public static SpriteSheet sheet;
	
	public static Image getImage(int x, int y){
		
		return sheet.getSprite(x, y);
	}
	
	public static void init(){
		try {
			Image i = new Image(new FileInputStream("/terrain.png"), "Sheet", true);
			sheet = new SpriteSheet(i, 16, 16);
		} catch (SlickException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Block Renderer code:

import org.lwjgl.opengl.GL11;
import org.newdawn.slick.opengl.Texture;

/**
 * 
 * @author Walt Pach (wxwsk8er)
 * 
 */
public class BlockRenderer {
	/*
	 * Global Constants.
	 */
	public static float BLOCK_WIDTH = 1f;
	public static float BLOCK_HEIGHT = 1f;
	public static float BLOCK_LENGTH = 1f;
	public static Texture blockTextureTemp;
	
	/* Renders the block. */
	/**
	 * 
	 * @param b The block object you want to render.
	 * @param x The X-Coordinate for the block you want to render.
	 * @param y The Y-Coordinate for the block you want to render.
	 * @param z The Z-Coordinate for the block you want to render.
	 */
	public static void a(Block b, float x, float y, float z){
		//blockTextureTemp = TextureManager.getTexture(b);
        //blockTextureTemp.bind();
		SpriteSheetManager.init();
		SpriteSheetManager.sheet.getSprite(2, 0).bind();
		
		GL11.glPushMatrix();
		GL11.glTranslatef(x, y, z);
		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_NEAREST);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_NEAREST);
		GL11.glBegin(GL11.GL_QUADS);
		
		// Front Face
		GL11.glNormal3f(0.0f, 0.0f, -1.0f);
		GL11.glTexCoord2f(0.0f, 0.0f);
        GL11.glVertex3f(-1.0f, -1.0f,  1.0f);   // Bottom Left Of The Texture and Quad
        GL11.glTexCoord2f(1.0f, 0.0f);
        GL11.glVertex3f( 1.0f, -1.0f,  1.0f);   // Bottom Right Of The Texture and Quad
        GL11.glTexCoord2f(1.0f, 1.0f);
        GL11.glVertex3f( 1.0f,  1.0f,  1.0f);   // Top Right Of The Texture and Quad
        GL11.glTexCoord2f(0.0f, 1.0f);
        GL11.glVertex3f(-1.0f,  1.0f,  1.0f);   // Top Left Of The Texture and Quad
		
		//GL11.glColor3f(0f, 1.0f, 0f);
		GL11.glNormal3f(0.0f, 0.0f, 1.0f);
		// Back Face
        GL11.glTexCoord2f(1.0f, 0.0f);
        GL11.glVertex3f(-1.0f, -1.0f, -1.0f);   // Bottom Right Of The Texture and Quad
        GL11.glTexCoord2f(1.0f, 1.0f);
        GL11.glVertex3f(-1.0f,  1.0f, -1.0f);   // Top Right Of The Texture and Quad
        GL11.glTexCoord2f(0.0f, 1.0f);
        GL11.glVertex3f( 1.0f,  1.0f, -1.0f);   // Top Left Of The Texture and Quad
        GL11.glTexCoord2f(0.0f, 0.0f);
        GL11.glVertex3f( 1.0f, -1.0f, -1.0f);   // Bottom Left Of The Texture and Quad


	   // GL11.glColor3f(0f, 0f, 1f);
	    GL11.glNormal3f(1.0f, 0.0f, 0.0f);
	 // Top Face
        GL11.glTexCoord2f(0.0f, 1.0f);
        GL11.glVertex3f(-1.0f,  1.0f, -1.0f);   // Top Left Of The Texture and Quad
        GL11.glTexCoord2f(0.0f, 0.0f);
        GL11.glVertex3f(-1.0f,  1.0f,  1.0f);   // Bottom Left Of The Texture and Quad
        GL11.glTexCoord2f(1.0f, 0.0f);
        GL11.glVertex3f( 1.0f,  1.0f,  1.0f);   // Bottom Right Of The Texture and Quad
        GL11.glTexCoord2f(1.0f, 1.0f);
        GL11.glVertex3f( 1.0f,  1.0f, -1.0f);   // Top Right Of The Texture and Quad

	    GL11.glNormal3f(-1.0f, 0.0f, 0.0f);
	    // Bottom Face
        GL11.glTexCoord2f(1.0f, 1.0f);
        GL11.glVertex3f(-1.0f, -1.0f, -1.0f);   // Top Right Of The Texture and Quad
        GL11.glTexCoord2f(0.0f, 1.0f);
        GL11.glVertex3f( 1.0f, -1.0f, -1.0f);   // Top Left Of The Texture and Quad
        GL11.glTexCoord2f(0.0f, 0.0f);
        GL11.glVertex3f( 1.0f, -1.0f,  1.0f);   // Bottom Left Of The Texture and Quad
        GL11.glTexCoord2f(1.0f, 0.0f);
        GL11.glVertex3f(-1.0f, -1.0f,  1.0f);   // Bottom Right Of The Texture and Quad

	    GL11.glNormal3f(0.0f, -1.0f, 0.0f);
	 // Right face
        GL11.glTexCoord2f(1.0f, 0.0f);
        GL11.glVertex3f( 1.0f, -1.0f, -1.0f);   // Bottom Right Of The Texture and Quad
        GL11.glTexCoord2f(1.0f, 1.0f);
        GL11.glVertex3f( 1.0f,  1.0f, -1.0f);   // Top Right Of The Texture and Quad
        GL11.glTexCoord2f(0.0f, 1.0f);
        GL11.glVertex3f( 1.0f,  1.0f,  1.0f);   // Top Left Of The Texture and Quad
        GL11.glTexCoord2f(0.0f, 0.0f);
        GL11.glVertex3f( 1.0f, -1.0f,  1.0f);   // Bottom Left Of The Texture and Quad

	    GL11.glNormal3f(0.0f, 1.0f, 0.0f);
	 // Left Face
        GL11.glTexCoord2f(0.0f, 0.0f);
        GL11.glVertex3f(-1.0f, -1.0f, -1.0f);   // Bottom Left Of The Texture and Quad
        GL11.glTexCoord2f(1.0f, 0.0f);
        GL11.glVertex3f(-1.0f, -1.0f,  1.0f);   // Bottom Right Of The Texture and Quad
        GL11.glTexCoord2f(1.0f, 1.0f);
        GL11.glVertex3f(-1.0f,  1.0f,  1.0f);   // Top Right Of The Texture and Quad
        GL11.glTexCoord2f(0.0f, 1.0f);
        GL11.glVertex3f(-1.0f,  1.0f, -1.0f);   // Top Left Of The Texture and Quad
	    GL11.glEnd();
	    
	    GL11.glPopMatrix();
	}
	
	public enum BlockFace{
		Top, Bottom, Left, Right, Back, Front;
	}
}

Thanks ahead of time

[abcdef]

you will need to post some code where where you create the texture data and where you bind it, your code doesn't seem to relate to where the problem lies.

[bogieman987]

What about setting the UV coordinates so that they only encompass the necessary part of the sprite sheet?

So since the sprite sheet is 16x16 blocks, a box is only a small 0.0625 height/width in terms of UV co-ordinates, not pixels.

With that, the top left square would have the following co-ordinates:
X - Y
Top Left: 0.0 - 1.0
Top Right: 0.0625 - 1.0
Bottom Left: 0.0 - 0.9375
Bottom Right: 0.0625 - 0.9375
I believe.