Texture.java

package fr.axicer.saintscube.render;

import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.GL12.*;
import static org.lwjgl.opengl.GL13.*;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.nio.ByteBuffer;

import javax.imageio.ImageIO;

import org.lwjgl.BufferUtils;

public class Texture {

    private final static int BYTES_PER_PIXEL = 4;
    public int ID;

    public Texture(String path) {
        BufferedImage image = null;
        try {
            image = ImageIO.read(TextureManager.class.getResourceAsStream(path));
        } catch (IOException e) {
            e.printStackTrace();
        }
        int[] pixels = new int[image.getWidth() * image.getHeight()];
        image.getRGB(0, 0, image.getWidth(), image.getHeight(), pixels, 0, image.getWidth());

        ByteBuffer buffer = BufferUtils.createByteBuffer(image.getWidth() * image.getHeight() * BYTES_PER_PIXEL); //4 for RGBA, 3 for RGB

        for(int y = 0; y < image.getHeight(); y++){
           for(int x = 0; x < image.getWidth(); x++){
               int pixel = pixels[y * image.getWidth() + x];
               buffer.put((byte) ((pixel >> 16) & 0xFF));     // Red component
               buffer.put((byte) ((pixel >> 8) & 0xFF));      // Green component
               buffer.put((byte) (pixel & 0xFF));               // Blue component
               buffer.put((byte) ((pixel >> 24) & 0xFF));    // Alpha component. Only for RGBA
           }
        }

        buffer.flip(); //FOR THE LOVE OF GOD DO NOT FORGET THIS

        // You now have a ByteBuffer filled with the color data of each pixel.
        // Now just create a texture ID and bind it. Then you can load it using
        // whatever OpenGL method you want, for example:
        this.ID = glGenTextures(); //Generate texture ID

        //Setup wrap mode
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

        //Setup texture scaling filtering
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

        //Send texel data to OpenGL
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.getWidth(), image.getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
    }

    public void bind(int sampler){
        glActiveTexture(GL_TEXTURE0+sampler);
        glBindTexture(GL_TEXTURE_2D, ID);
    }

    public static void unbind(){
        glBindTexture(GL_TEXTURE_2D, 0);
    }
}