Quick fix: Implementation of scrollable hotbar

[the-lightstack]

This is a quick and dirty feature to make the hotbar scrollable.
Just add the following to /src/ui/hotbar.c

this function right before the hotbar_init function

static void scrollCallback(GLFWwindow* window, double xoffset, double yoffset){
    // Y-offset is either 1 or -1 (scroll up or down)
    struct UIHotbar* self = (struct UIHotbar*)glfwGetWindowUserPointer(window);
    // Scroll left 
    if (yoffset == 1){
        if (self->index == 0){
            self->index = 9;
        }else{
            self->index -= 1;
        }
    // Scroll right
    }else if(yoffset == -1){
        self->index += 1;
        self->index = self->index % 10;
    }
    return;
}

in hotbar_init, after self->index = 0;

    glfwSetWindowUserPointer(state.window->handle,self);
    glfwSetScrollCallback(state.window->handle,scrollCallback);

As this solution is very hacky, I did not want to make this into a pull request but think this improves the game.

[mikumikudice]

Maybe open a pull request?

[the-lightstack]

I feel like this would be a valuable addition, but I made use of the WindowUserPointer in a way it is not supposed to be used which would just contribute unclear code which I don't want since this is a properly structured project.

[Lampe2020]

I implemented it into my install of minecraft-weekend and the game is so much easier now, I think maybe you really could open a pull request, even though this is a bit hacky.

[the-lightstack]

Ok accepted 😃 #73 Just gotta hope that the pull request gets merged some time