LibGDX: Polygon with repeating texture.

Newbie & Debugging Questions
#1

I am trying to draw a polygon with a repeating texture in 2d. The texture is 128x128. The following code, when executed, displays the polygon correctly, but the texture is “stretched.” I have seen other questions like this on this site and stackoverflow, but the answers are always inconclusive.

I am almost of the mind that this was possible when libgdx supported GL10, but now that it is GL20 only, you must use a mesh, set up the UV coords separately, create and apply a shader, etc, etc. That is a lot of work for what would seem to be a common operation needed in a 2d game. I’d like to get a couple other opinions before I head down that frustrating path.

Here is the code:


public class PolygonTest {

  float[] vertices = {200, 100, 200, 150, 250, 150, 250, 100, 240, 100, 240, 140, 210, 
                      140, 210, 100};

  Texture bricks;
  TextureRegion textureRegion;
  PolygonRegion polygonRegion;
  PolygonSpriteBatch polygonSpriteBatch;
  PolygonSprite polygonSprite;

  public PolygonTest() {
    bricks = new Texture(Gdx.files.internal("bricks.png"));
    bricks.setWrap(TextureWrap.Repeat, TextureWrap.Repeat);
    textureRegion = new TextureRegion(bricks);
    EarClippingTriangulator a = new EarClippingTriangulator();
    ShortArray sar = a.computeTriangles(vertices);
    polygonRegion = new PolygonRegion(textureRegion, vertices, sar.toArray());
    polygonSprite = new PolygonSprite(polygonRegion);
    polygonSpriteBatch = new PolygonSpriteBatch();
  }

  public void render(OrthographicCamera camera) {
    polygonSpriteBatch.setProjectionMatrix(camera.combined);
    polygonSpriteBatch.begin();
    polygonSprite.draw(polygonSpriteBatch);
    polygonSpriteBatch.end();
    }
}

Please note that even if I put something like:


textureRegion = new TextureRegion(bricks,0,0,512,512);

or:


textureRegion.setU(0)
textureRegion.setU2(100);
textureRegion.setV(0);
textureRegion.setV2(100);

…it makes no difference. Nor does changing any of the numbers in the above examples.