gdepot_shadertestroom - http://stingwel.narod.ru/wel/games/hl2/hl2_screen/hl2_screen_3.html
watereffects.jpg - http://www.tomshardware.com/reviews/ready-winter-games,687-6.html
All others - https://techreport.com/review/7221/a-preview-of-half-life-2-performance