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/usr/share/psychtoolbox-3/PsychOneliners/IsGLES1.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.

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function rc = IsGLES1
% Returns 1 if active rendering api is OpenGL-ES1.x,
% 0 otherwise.

rc = strcmp(getenv('PSYCH_USE_GFX_BACKEND'), 'gles1');