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This is a video showcasing the then brand new HDR ("high dynamic range rendering") in Half-Life 2: Lost Coast. It was originally shared by Valve in a Steam news update on June 24 2005, 4 months before the release of Lost Coast. And no, "Fixed Aperture" has nothing to do with Portal.
http://combineoverwiki.net/wiki/Half-Life_2:_Lost_Coast
http://en.wikipedia.org/wiki/High_dynamic_range_rendering