ButtonState = {
    eventCountThisFrame: number;
    isDown: boolean;
}

ButtonStates[] = []


onmousedown()
{
    if button == left {
        // or use an enum
        ButtonStates[0].eventCountThisFrame += 1;
        ButtonStates[0].isDown = true;
    }
    if button == right {
        // or use an enum
        ButtonStates[1].eventCountThisFrame += 1;
        ButtonStates[1].isDown = true;
    }
}


render()
{
    // do all the shit

    for each buttonstate
    {
        ButtonStates[i].eventCountThisFrame = 0;
    }
}