What it'll be used for is this: I want to make use of OpenGL occlusion routines to determine which parts of the world can be skipped in drawing. For that i need to create a rough shape around the parts that would be drawn, keeping it cheap enough to actually make a difference. That shape is created by taking all units that would contain something and drawing shapes around them.

I could go the naive way and draw one cube per unit and call it a day. However that would be rather slow and i'd prefer to draw a rectangular shape that encompasses as many units as possible.

To give an example on practice, with a map such as this: 
  0   4   8   12 15
 00111000000000000
  1111000000000000
  1111000000000000
  1111000000000000
 40000000000000000
  0000000000000000
  0000000000000000
  0000000000000000
 80000000000000000
  0000000000000000
  0000000000000000
  0000000000000000
120000000000000000
  0000000000000000
  0000000000000000
150000000000000000

[download]
, the result would be: 0:3:2:3|2:3:0:1|0:1:1:1|1:1:0:0|. This would be 4 shapes as opposed to the 15 shapes needed if i were drawing this naively.

I'm not sure at all what you mean in your example in the first place. But my guts tell me that you kinda missed the point. Also, i have no idea about how to use inline-c.

Edit: I should also note, the grid won't get bigger. At least not in my application. 16x16 is the limit on the data i have. I merely made it work for general cases in case others might find it useful and because i found it easier to work that way.

In reply to Re^2: Implementation of a QuadTree and worries of a lone programmer by Xenofur
in thread RFC: Implementation of a QuadTree and worries of a lone programmer by Xenofur

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