6 * From page 35 (page 41 of the PDF) of the GLSL 1.20 spec:
8 * "The equality operators and assignment operator are only allowed if the
9 * two operands are same size and type....Both array operands must be
10 * explicitly sized. When using the equality operators ... two arrays are
11 * equal if and only if all the elements are element-wise equal.
16 uniform vec4 b[3]; // Note the differing size
20 gl_Position = vec4(a == b);