struct Attributes {
    float2 pos;
    float2 coords;
};
struct Varyings {
    float2 position;
    float2 coords;

};
uniform float t[2];
uniform half3x3 m;

Varyings main(in const Attributes attributes) {
    Varyings varyings;
    varyings.coords   = (m*float3(attributes.coords + float2(t[0], t[1]), 1)).xy;
    varyings.position = attributes.pos;
    return varyings;
}