[gameprogrammer] OpenGL and mouse click location

Hi everybody,

I'm trying to write a tile-based game in OpenGL/SDL. The camera looks
directly down on the map (no isometric view, just top-down). The
scrolling is realised via translating the map and zooming is realised by
changing the angle in gluPerspective. So the map remains at a fixed
z-coordinate (10 in my case).
The tiles are textured quads using pngs as textures.

My question is: How do I determine which tile the user clicked on? Even
an algorithm without the zoom and scrolling would be perfect since the
rest is easy.

Best regards, Tobias

P.S.: I'm sorry if it's a double post, but I had some problems with my mail 
program.



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