I'm working on creating a 2d map prototype, and I've come across the rendering bit of it. I have a tilesheet with tiles, each tile is 30x30 pixels, and there's a 1px border to delimitate them.

In SFML the usual method of drawing a part of a tilesheet is declaring an IntRect with the rectangle coordinates then calling the setTextureRectangle() method to a sprite.

In a small game it would work, but I have well over 45 tiles and adding more every day, I can't declare 45 intRects for every material, the map is not optimized yet, it would get even worse if I would have to call the setTextureRect() method, aside from declaring 45 rectangleInts.

How could I simplify this task? All I need is a very simple and flexible solution for extracting a region of the tilesheet.

Basically I have a Tile class. I create multiple instances of tiles (vectors) and each tile has a position and a material. I parse a map file and as I parse it I set the materials of the map according to the parsed map file, and all I need to do is render.

Basically I need to do something like this:

switch(tile.getMaterial())
{
   case GRASS:
       material_sprite.setTextureRect(something);
       window.draw(material_sprite);
       break;

   case WATER:
       material_sprite.setTextureRect(something);
       window.draw(material_sprite);
       break;

  // handle more cases
}