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jnuit lwjgl utility classes
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package im.bci.jnuit.lwjgl.animation;

import im.bci.jnuit.animation.IAnimationCollection;
import im.bci.jnuit.lwjgl.LwjglHelper;
import im.bci.jnuit.lwjgl.animation.NanimParser.Nanim;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import org.lwjgl.opengl.GL11;

public class NanimationCollection implements IAnimationCollection {

    LinkedHashMap animations;
    private final Map images;

    public NanimationCollection(Nanim nanim) {
        images = loadImages(nanim);
        animations = new LinkedHashMap<>(nanim.getAnimationsCount());
        for (im.bci.jnuit.lwjgl.animation.NanimParser.Animation nanimation : nanim.getAnimationsList()) {
            addAnimation(new Nanimation(nanimation, images));
        }
    }

    private static Map loadImages(Nanim nanim) {

        Map images = new HashMap<>();
        for (im.bci.jnuit.lwjgl.animation.NanimParser.Image nimage : nanim.getImagesList()) {
            NanimationImage image = loadImage(nimage);
            images.put(nimage.getName(), image);
        }
        return images;
    }

    private static NanimationImage loadImage(im.bci.jnuit.lwjgl.animation.NanimParser.Image nimage) {
        int texWidth = nimage.getWidth();
        int texHeight = nimage.getHeight();
        NanimationImage texture = new NanimationImage(nimage.getFormat().equals(NanimParser.PixelFormat.RGBA_8888));

        ByteBuffer imageBuffer = ByteBuffer.allocateDirect(nimage.getPixels().size());
        imageBuffer.order(ByteOrder.nativeOrder());
        imageBuffer.put(nimage.getPixels().asReadOnlyByteBuffer());
        imageBuffer.flip();

        // produce a texture from the byte buffer
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, texture.getId());
        GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1);
        LwjglHelper.setupGLTextureParams();
        int pixelFormat = nimage.getFormat().equals(NanimParser.PixelFormat.RGBA_8888) ? GL11.GL_RGBA
                : GL11.GL_RGB;
        GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, pixelFormat, texWidth,
                texHeight, 0, pixelFormat, GL11.GL_UNSIGNED_BYTE, imageBuffer);
        return texture;
    }

    private void addAnimation(Nanimation animation) {
        animations.put(animation.getName(), animation);
    }

    @Override
    public Nanimation getFirst() {
        return animations.values().iterator().next();
    }

    @Override
    public Nanimation getAnimationByName(String name) {
        Nanimation nanimation = animations.get(name);
        if(null != nanimation) {
            return nanimation;
        } else {
            throw new RuntimeException("Unknown animation " + name);
        }        
    }

    public Map getImages() {
        return images;
    }
}