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Screen Space Ambient Occlusion (SSAO shader)

This is Screen Space Ambient Occlusion (SSAO) shader. Porting from Source SDK.

Screen space ambient occlusion (SSAO) is a computer graphics technique for efficiently approximating the ambient occlusion effect in real time. It was developed by Vladimir Kajalin while working at Crytek and was used for the first time in 2007 by the video game Crysis, also developed by Crytek.

Convars:
pp_ssao - Enable/Disable screen space ambient occlusion.
pp_ssao_quality - 32 - very hight, 16 - hight, 8 - normal, 4 - low; (1-32).
pp_ssao_debug - Enable/Disable SSAO debug.
pp_ssao_contrast - SSAO contrast (0 - 5).
pp_ssao_radius - SSAO radius (1 - 32).
pp_ssao_bias - SSAO bias (0 - 2).
pp_ssao_bias_offset - SSAO radius offset (0 - 1).
pp_ssao_custom_depth - Custom depth buffer have more bits but have no alphatest support.
pp_ssao_znear - znear depth buffer (0.01 - 100).
pp_ssao_zfar - zfar depth buffer (0.1 - 1000).
pp_ssao_debug_fp - Show debug first pass SSAO.
pp_ssao_debug_dp - Show debug current Depth buffer.
pp_ssao_translucent - translucent fix (1 - on, 0 - off)

Credits:
Akabenko – porting shader from Source SDK to GMOD.
NotUnknownDude, Ethan – making custom Depth Buffer.

Thansk Goldermor for porting BTR-82.