struct Attributes {
    float2 position;
    float4 src;
    float4 dst;
};

struct Varyings {
    float2 position;
    float4 color;
};

uniform blender myBlender;

Varyings main(const Attributes attr) {
    return Varyings(attr.position, myBlender.eval(attr.src, attr.dst));
}

/*%%*
effects are not permitted in mesh vertex shaders
*%%*/