[pixel shader]
typedef const precise row_major float2x2 mat_t;
float4 main() : sv_target
{
    const precise row_major mat_t mat = float2x2(0.1, 0.2, 0.3, 0.4);
    return mat;
}

[test]
todo(glsl) draw quad
if(sm<6)  probe all rgba (0.1, 0.2, 0.3, 0.4)
if(sm>=6) probe all rgba (0.1, 0.3, 0.2, 0.4)