Fig.1 - your standard tilemap

Fig .2 - tilemap with perspective


Hey, I got a pretty simple question and I'm sure openGL is needed.
But does anyone know how to give their tilemaps perspective by just using the camera and scaling?

if (floor != null) {
      for (int y = (int) horizon; y < height; y++) {
        float distance = (camera.z * scale.y) / (y - horizon);
        float ratio = distance / scale.x;

        double dx = -sin * ratio;
        double dy = cos * ratio;

        double sx = camera.x + distance * cos - width / 2 * dx;
        double sy = camera.y + distance * sin - width / 2 * dy;

        for (int x = 0; x < width; x++) {
          int cx = (int) Math.abs(sx % floor.getWidth());
          int cy = (int) Math.abs(sy % floor.getHeight());
          int color = floor.getPixel(cx, cy);

          setColor(color);
          drawPixel(x, y);

          sx += dx;
          sy += dy;
        }
      }
    }

This was from an old example I had laying around, tried converting it into ruby and without success :(
I'm using TileD to make my maps if that means anything.

And to make this easy to understand, the effect I'm trying to recreate is Snes's Mode7 effect.

Thanks