repeating infinite background

package net.dermetfan.someLibgdxTests.screens;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.ScreenAdapter;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.Texture.TextureWrap;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.utils.viewport.ScreenViewport;
import com.badlogic.gdx.utils.viewport.Viewport;
import net.dermetfan.someLibgdxTests.Assets;
import net.dermetfan.someLibgdxTests.SomeLibgdxTests;

public class RepeatingBackgroundTest extends ScreenAdapter {

    Viewport viewport = new ScreenViewport();
    final Batch batch = new SpriteBatch();
    Texture texture = SomeLibgdxTests.assets.get(Assets.testImage);

    {
        texture.setWrap(TextureWrap.Repeat, TextureWrap.Repeat);
    }

    @Override
    public void render(float delta) {
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        int w = texture.getWidth(), h = texture.getHeight();
        float y = viewport.getCamera().position.y += delta * 100;
        viewport.getCamera().update();
        batch.setProjectionMatrix(viewport.getCamera().combined);
        batch.begin();
        int repeat = (int) viewport.getWorldHeight() / h + 2;
        batch.draw(texture, 0, -viewport.getWorldHeight() / 2 + h * (int) (y / h), w, h * repeat, 0, repeat, 1, 0);
        batch.end();
    }

    @Override
    public void resize(int width, int height) {
        viewport.update(width, height, true);
    }

    @Override
    public void dispose() {
        batch.dispose();
    }

}