BGE fake SSAO

Hi!
Look at the two pictures.
First - true algorithm SSAO, which is built into Blender3d.

The second picture - 2d filter, with no real SSAO. Base on phantom (ring) rendering - do not miscalculate AO, and imitated. This algorithm is not correct - fake.

Where to get the correct shader SSAO? And whether it is possible from the main program to extend this algorithm for the player?

p.s. Shaders from Martins - fake SSAO

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