Windows (7's) OpenGL software implementation uses an unstable sorting algorithm

> Who fancies a heapsort? 
> https://github.com/abdelq/heapsort/blob/master/heapsort.asm 
> MIPS; needs translating to x86 asm 
> 
> http://www.rosettacode.org/wiki/Sorting_algorithms/Heapsort#Forth 
> again doesn't have a version in x86. 

It was a little bit interesting to investigate heaps and heapsort.

However the algorithm is unstable.

I suspect the OpenGL software driver uses an unstable sorting algorithm for depth sorting.

This shows by the blinking/flickering triangles as they are roughly on the same depth.

If the camera stops moving then after a while the sort will become stable and the depth of the triangles stops flickering around.

Possibly a clear sign that an unstable sort is being used, most likely quicksort ! ;)

Bye,
  Skybuck.