我遵循了一个教程，用于读取图片并从中创建纹理，但是，渲染时它会上下翻转。图像是2的幂。

主班

public class Main {
public static void main(String args[]) throws IOException{
    Main quadExample = new Main();
    quadExample.start();
}

public void start() throws IOException {
    try {
    Display.setDisplayMode(new DisplayMode(1280,720));
    Display.create();
} catch (LWJGLException e) {
    e.printStackTrace();
    System.exit(0);
}

// init OpenGL
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, 1280, 0, 720, -1, 1);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glClearColor(0, 1, 0, 0);

GL11.glEnable(GL11.GL_TEXTURE_2D);

BufferedImage image = TextureLoader.loadImage("C:\\test.png");
final int textureID = TextureLoader.loadTexture(image);

while (!Display.isCloseRequested()) {
    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.glBindTexture(GL11.GL_TEXTURE_2D, textureID);
    GL11.glBegin(GL11.GL_QUADS);
    GL11.glTexCoord2f(0, 0);
    GL11.glVertex2f(0, 0);

    GL11.glTexCoord2f(1, 0);
    GL11.glVertex2f(256, 0);

    GL11.glTexCoord2f(1, 1);
    GL11.glVertex2f(256, 256);

    GL11.glTexCoord2f(0, 1);
    GL11.glVertex2f(0, 256);
    GL11.glEnd();

    Display.update();
}

Display.destroy();
}

}

纹理加载器

public class TextureLoader {
private static final int BYTES_PER_PIXEL = 4;

public static int loadTexture(BufferedImage image) {
    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);

    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));
            buffer.put((byte) ((pixel >> 8) & 0xFF));
            buffer.put((byte) (pixel & 0xFF));
            buffer.put((byte) ((pixel >> 24) & 0xFF));

        }
    }

    buffer.flip();

    int textureID = glGenTextures();
    glBindTexture(GL_TEXTURE_2D, textureID);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL12.GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL12.GL_CLAMP_TO_EDGE);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, image.getWidth(),
            image.getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);

    return textureID;
}

public static BufferedImage loadImage(String location) {
    try {
        return ImageIO.read(new File(location));
    } catch (IOException e) {
        System.out.println(Errors.IOException);
        e.printStackTrace();
    }
    return null;
}

代码是否有问题，还是必须在创建纹理之前翻转图像？