array of vectors glsl
uniform vec3 COLOR_MASKS[ 8 ] = { vec3( 0.0, 0.0, 0.0 ),
vec3( 0.5, 0.5, 0.5 ),
vec3( 1.0, 0.5, 0.5 ),
vec3( 0.5, 1.0, 0.5 ),
vec3( 0.5, 0.5, 1.0 ),
vec3( 0.5, 1.0, 1.0 ),
vec3( 1.0, 0.5, 1.0 ),
vec3( 1.0, 1.0, 0.5 ) };