[pixel shader]
struct input
{
    struct
    {
        float4 pos : sv_position;
    } m;
};

struct output
{
    struct
    {
        float4 color : sv_target;
    } m;
};

struct output main(struct input i)
{
    struct output o;
    o.m.color = i.m.pos;
    return o;
}

[test]
draw quad
probe rgba (0, 1) (0.5, 1.5, 0.0, 1.0)
probe rgba (1, 0) (1.5, 0.5, 0.0, 1.0)
probe rgba (3, 5) (3.5, 5.5, 0.0, 1.0)