IMPORTANT! This mod only works properly on devices which support HDR maps in Source, try loading any map in HL2 Episode 1 or 2 and set HDR in settings to Full, if you get black textures/corruption everywhere, or a crash, your device is NOT compatible with this mod, sorry :(

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commandline arguments:

+developer 0

env's

LIBGL_USEVBO=0

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Ultra High graphics option:

+gl_dropmips 0 (8+ GIGS of RAM required) to turn off all textures shrinking to 50%

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old commandline arguments (obsolete)

-nouserclip +gl_blitmode

other env's (optional) (possible speedup or slowdown)

LIBGL_ES=0 LIBGL_VSYNC=1 LIBGL_FB=1 LIBGL_BLITFULLSCREEN=1 LIBGL_NOBGRA=1 LIBGL_POTFRAMEBUFFER=1 LIBGL_NOTEXMAT=1

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Resolutions: 
To change your in-game resolution, add this to your commandline arguments:
-windowed -w 1024 -h 540

You can change w and h to your desired resolution.

Half Life 2 Copyright Valve
Update by FilipViktor repack by [Salat-Production] re-repacked by Sersoft
Original Android port Copyright Nvidia and EA Games

Credit to Nillerusr for proper Android port
Credit to Timmytheturtle for helping patch all the crashes! :)
Credit to Sisash for gl_dropmips 0 tip

Enjoy!