var viewMatrix = gameCamera.GetViewMatrix();
spriteBatch.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied, SamplerState.PointClamp, transformMatrix: viewMatrix);

spriteBatch.Draw(background, new Vector2(-100, -200), null, Color.DarkRed, 0, new Vector2(), 1, SpriteEffects.None, 0);

mapManager.currentMap.layerManager.DrawLayers(spriteBatch);

player.Draw(spriteBatch);

spriteBatch.End();

foreach (Layer layer in layers)
{
    for (int i = 0; i <= layer.height - 1; i++)
    {
        for (int j = 0; j <= layer.width - 1; j++)
        {
            if (layer.Tiles[i, j] != null && layer.Tiles[i, j].onScreen == true)
            {
                spriteBatch.Draw(layer.Tiles[i, j].tileSet.spriteSheet, layer.Tiles[i, j].position, layer.Tiles[i, j].sourceRect, Color.White);
            }
        }
    }
}

public Matrix GetViewMatrix()
{
    return
    Matrix.CreateTranslation(new Vector3(-position.X, -position.Y, 0.0f)) *
    Matrix.CreateTranslation(new Vector3(-origin, 0.0f)) *
    Matrix.CreateScale(zoom, zoom, 1) *
    Matrix.CreateTranslation(new Vector3(origin, 0.0f));
}