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use core::fmt;
use core::sync::atomic::{AtomicBool, Ordering};

use number_traits::Float;
use specs::{Component, VecStorage};


pub struct Sprite<T, I>
    where T: 'static + Float + Send + Sync,
          I: 'static + Send + Sync,
{
    pub image: I,
    pub x: T,
    pub y: T,
    pub w: T,
    pub h: T,
    z: usize,
    layer: usize,
    dirty: AtomicBool,
}


impl<T, I> fmt::Debug for Sprite<T, I>
    where T: 'static + fmt::Debug + Float + Send + Sync,
          I: 'static + fmt::Debug + Send + Sync,
{
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("Sprite")
        .field("image", &self.image)
        .field("x", &self.x)
        .field("y", &self.y)
        .field("w", &self.w)
        .field("h", &self.h)
        .field("z", &self.z)
        .field("layer", &self.layer)
        .finish()
    }
}


impl<T, I> Component for Sprite<T, I>
    where T: 'static + Float + Send + Sync,
          I: 'static + Send + Sync,
{
    type Storage = VecStorage<Self>;
}


impl<T, I> Sprite<T, I>
    where T: 'static + Float + Send + Sync,
          I: 'static + Send + Sync,
{
    #[inline(always)]
    pub fn new(image: I) -> Self {
        Sprite {
            image: image,
            x: T::zero(),
            y: T::zero(),
            w: T::one(),
            h: T::one(),
            z: 0,
            layer: 0,
            dirty: AtomicBool::new(true),
        }
    }

    #[inline(always)]
    pub fn flag(&self, dirty: bool) {
        self.dirty.store(dirty, Ordering::SeqCst)
    }

    #[inline(always)]
    pub fn is_dirty(&self) -> bool {
        self.dirty.load(Ordering::SeqCst)
    }

    #[inline(always)]
    pub fn z(&self) -> &usize { &self.z }
    #[inline(always)]
    pub fn layer(&self) -> &usize { &self.layer }

    #[inline(always)]
    pub fn set_z(&mut self, z: usize) {
        self.z = z;
        self.flag(true);
    }
    #[inline(always)]
    pub fn set_layer(&mut self, layer: usize) {
        self.layer = layer;
        self.flag(true);
    }
}