Java LWJGL：使用背景色渲染纹理

我正在做一个我计划了很长时间的游戏项目。我设置了基本的东西，并希望使纹理工作。我使用自定义编写的TextureLoader和您可能知道的代码片段，并将生成的纹理id放入哈希映射中，这样我就不需要重新创建新的纹理id

package net.sep87x.atmos.render;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.HashMap;

import javax.imageio.ImageIO;

import net.sep87x.atmos.client.Logger;

import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL12;

public class TextureLoader {

    HashMap<String, Integer> textureIds;

    private Logger logger;

    public TextureLoader() {
        this.textureIds = new HashMap<String, Integer>();
        logger = Logger.getInstance();
    }

    public int getTextureId(String path) {
        if (this.textureIds.containsKey(path)) {
            return this.textureIds.get(path);
        } else {
            try {
                return bindTexture(path);
            } catch (IOException e) {
                return -1;
            }
        }
    }

    public int bindTexture(String path) throws IOException {
        BufferedImage img = ImageIO.read(new File(path));

        int[] pixels = new int[img.getWidth() * img.getHeight()];
        img.getRGB(0, 0, img.getWidth(), img.getHeight(), pixels, 0, img.getWidth());

        ByteBuffer buffer = BufferUtils.createByteBuffer(img.getWidth() * img.getHeight() * 4);

        for (int y = 0; y < img.getHeight(); y++) {
            for (int x = 0; x < img.getWidth(); x++) {
                int pixel = pixels[y * img.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 = GL11.glGenTextures();
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, textureID);

        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL12.GL_CLAMP_TO_EDGE);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL12.GL_CLAMP_TO_EDGE);

        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);

        GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGBA8, img.getWidth(), img.getHeight(), 0, GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buffer);

        this.textureIds.put(path, textureID);

        logger.log("Loaded \"" + path + "\" as " + textureID + ".");

        return textureID;
    }

}

正在通过渲染调用的GUI屏幕类：

    private float fadeIn = 0f;

    @Override
    public void render(Atmos game) {        
        glPushMatrix();
            glBegin(GL_QUADS);
                if (fadeIn < 1) fadeIn += 0.001f;

                glColor3f(0f, (148f / 255f) * fadeIn, 1f * fadeIn);
                glVertex2f(0, 0);
                glVertex2f(1920, 0);

                glColor3f(0f, (83f / 255f), (142f / 255f));
                glVertex2f(1920, 1080);
                glVertex2f(0, 1080);
            glEnd();
        glPopMatrix();

        glPushMatrix();
            glBegin(GL_QUADS);
                glBindTexture(GL_TEXTURE_2D, game.textureLoader.getTextureId("res/img/gui/atmos.png"));

                glTexCoord2f(0, 0);
                glVertex2f((game.width - 512f) / 2f, (game.height - 512f) / 2f);
                glTexCoord2f(1, 0);
                glVertex2f((game.width - 512f) / 2f + 512, (game.height - 512f) / 2f);
                glTexCoord2f(1, 1);
                glVertex2f((game.width - 512f) / 2f + 512, (game.height - 512f) / 2f + 512);
                glTexCoord2f(0, 1);
                glVertex2f((game.width - 512f) / 2f, (game.height - 512f) / 2f + 512);
            glEnd();
        glPopMatrix();
    }

现在，正如我已经读过的，这段代码应该可以工作，但它不能。结果如下：

但是纹理都是白色的，字体内部有白色到透明的渐变，背景应该有蓝色到浅蓝色的渐变。我知道我错过了什么，但我不知道是什么。有人能帮我吗

    private float fadeIn = 0f;

    @Override
    public void render(Atmos game) {        
        glPushMatrix();
            glBegin(GL_QUADS);
                if (fadeIn < 1) fadeIn += 0.001f;

                glColor3f(0f, (148f / 255f) * fadeIn, 1f * fadeIn);
                glVertex2f(0, 0);
                glVertex2f(1920, 0);

                glColor3f(0f, (83f / 255f), (142f / 255f));
                glVertex2f(1920, 1080);
                glVertex2f(0, 1080);
            glEnd();
        glPopMatrix();

        glPushMatrix();
            glBegin(GL_QUADS);
                glBindTexture(GL_TEXTURE_2D, game.textureLoader.getTextureId("res/img/gui/atmos.png"));

                glTexCoord2f(0, 0);
                glVertex2f((game.width - 512f) / 2f, (game.height - 512f) / 2f);
                glTexCoord2f(1, 0);
                glVertex2f((game.width - 512f) / 2f + 512, (game.height - 512f) / 2f);
                glTexCoord2f(1, 1);
                glVertex2f((game.width - 512f) / 2f + 512, (game.height - 512f) / 2f + 512);
                glTexCoord2f(0, 1);
                glVertex2f((game.width - 512f) / 2f, (game.height - 512f) / 2f + 512);
            glEnd();
        glPopMatrix();
    }