typedef struct
{
    float4 origin;
    float4 direction;
}
Ray;

__kernel void primary(  const int width,
            const int height,
            const float widthArg,
            const float heightArg,
            const float4 origin,
            const float4 right,
            const float4 up,
            const float4 planePos,
            __global Ray* rays,
            const int num)
{
    const int idx = get_global_id(0);

    if(idx < num)
    {
        int2 coord = (int2)(idx % width, idx / width);

        float x = (float)(coord.x) - widthArg;
        float y = (float)(coord.y) - heightArg;

        rays[idx].origin = origin;
        rays[idx].direction = normalize(right * x + up * y + planePos);
    }
}