map draw layer

 public void Draw(int layer = 0)
        {
            if (this._reRenderMap)
            {
                this.MapRendered = false;
                this.ReleaseRenderTextures();
                this._preRenderLayer = 0;
                this._preRenderStage = 0;
                this._reRenderMap = false;
            }
            if (layer == 0)
            {
                this.DrawPanorama();
            }
            if (!this.MapRendered)
            {
                if (Globals.Database.RenderCaching)
                {
                    return;
                }
                switch (layer)
                {
                    case 0:
                    {
                        for (int i = 0; i < 3; i++)
                        {
                            this.DrawMapLayer(null, i, Globals.AnimFrame, this.GetX(), this.GetY());
                        }
                        break;
                    }
                    case 1:
                    {
                        this.DrawMapLayer(null, 3, Globals.AnimFrame, this.GetX(), this.GetY());
                        break;
                    }
                    case 2:
                    {
                        this.DrawMapLayer(null, 4, Globals.AnimFrame, this.GetX(), this.GetY());
                        break;
                    }
                }
            }
            else if (layer == 0)
            {
                GameGraphics.DrawGameTexture(this.LowerTextures[Globals.AnimFrame], this.GetX(), this.GetY(), null, GameBlendModes.None, null, 0f);
            }
            else if (layer != 1)
            {
                GameGraphics.DrawGameTexture(this.PeakTextures[Globals.AnimFrame], this.GetX(), this.GetY(), null, GameBlendModes.None, null, 0f);
            }
            else
            {
                GameGraphics.DrawGameTexture(this.UpperTextures[Globals.AnimFrame], this.GetX(), this.GetY(), null, GameBlendModes.None, null, 0f);
            }
            if (layer == 0)
            {
                foreach (KeyValuePair<int, MapItemInstance> item in this.MapItems)
                {
                    ItemBase itemBase = ItemBase.GetItem(item.Value.ItemNum);
                    if (itemBase != null)
                    {
                        GameTexture itemTex = Globals.ContentManager.GetTexture(GameContentManager.TextureType.Item, itemBase.Pic);
                        if (itemTex != null)
                        {
                            GameGraphics.DrawGameTexture(itemTex, this.GetX() + (float)(item.Value.X * Options.TileWidth), this.GetY() + (float)(item.Value.Y * Options.TileHeight), null, GameBlendModes.None, null, 0f);
                        }
                    }
                }
                foreach (LightBase light in base.Lights)
                {
                    double w = (double)light.Size;
                    float x = this.GetX() + (float)(light.TileX * Options.TileWidth + light.OffsetX) + (float)Options.TileWidth / 2f;
                    float y = this.GetY() + (float)(light.TileY * Options.TileHeight + light.OffsetY) + (float)Options.TileHeight / 2f;
                    GameGraphics.AddLight((int)x, (int)y, (int)w, light.Intensity, light.Expand, light.Color);
                }
                this.UpdateMapAttributes();
            }
            if (layer == 2)
            {
                this.DrawFog();
                this.DrawOverlayGraphic();
            }
        }