Multidimensional arrays are added to GLSL via either GL_ARB_arrays_of_arrays extension or GLSL 4.30. I've had a couple people tell me that the
GL_ARB_arrays_of_arrays
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We are proud to announce the release of the next iteration, version 1.0.3, of the Graphics Installer for Linux*. Read the download page for more information.
Cheers!