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//! `amethyst` rendering ecs resources
//!
use smallvec::SmallVec;
use winit::Window;
use amethyst_assets::{PrefabData, PrefabError};
use amethyst_core::specs::{Entity, Write};
use crate::color::Rgba;
/// The ambient color of a scene
#[derive(Clone, Debug, Default, Serialize, Deserialize)]
pub struct AmbientColor(pub Rgba);
impl AsRef<Rgba> for AmbientColor {
fn as_ref(&self) -> &Rgba {
&self.0
}
}
impl<'a> PrefabData<'a> for AmbientColor {
type SystemData = Write<'a, AmbientColor>;
type Result = ();
fn add_to_entity(
&self,
_: Entity,
ambient: &mut Self::SystemData,
_: &[Entity],
) -> Result<(), PrefabError> {
ambient.0 = self.0;
Ok(())
}
}
/// This specs resource permits sending commands to the
/// renderer internal window.
#[derive(Default)]
pub struct WindowMessages {
// It's unlikely we'll get more than one command per frame
// 1 Box also makes this the same size as a Vec, so this costs
// no more space in the structure than a Vec would.
//
// NOTE TO FUTURE AUTHORS: This could be an FnOnce but that's not possible
// right now as of 2017-10-02 because FnOnce isn't object safe. It might
// be possible as soon as FnBox stabilizes. For now I'll use FnMut instead.
pub(crate) queue: SmallVec<[Box<dyn FnMut(&Window) + Send + Sync + 'static>; 2]>,
}
impl WindowMessages {
/// Create a new `WindowMessages`
pub fn new() -> Self {
Default::default()
}
/// Execute this closure on the `winit::Window` next frame.
pub fn send_command<F>(&mut self, command: F)
where
F: FnMut(&Window) + Send + Sync + 'static,
{
self.queue.push(Box::new(command));
}
}
/// World resource that stores screen dimensions.
#[derive(Debug)]
pub struct ScreenDimensions {
/// Screen width in pixels (px).
pub(crate) w: f64,
/// Screen height in pixels (px).
pub(crate) h: f64,
/// Width divided by height.
aspect_ratio: f32,
/// The ratio between the backing framebuffer resolution and the window size in screen pixels.
/// This is typically one for a normal display and two for a retina display.
hidpi: f64,
pub(crate) dirty: bool,
}
impl ScreenDimensions {
/// Creates a new screen dimensions object with the given width and height.
pub fn new(w: u32, h: u32, hidpi: f64) -> Self {
ScreenDimensions {
w: w as f64,
h: h as f64,
aspect_ratio: w as f32 / h as f32,
hidpi,
dirty: false,
}
}
/// Returns the current width of the window.
pub fn width(&self) -> f32 {
self.w as f32
}
/// Returns the current height of the window.
pub fn height(&self) -> f32 {
self.h as f32
}
/// Returns the current aspect ratio of the window.
pub fn aspect_ratio(&self) -> f32 {
self.aspect_ratio
}
/// Returns the ratio between the backing framebuffer resolution and the window size in screen pixels.
/// This is typically one for a normal display and two for a retina display.
pub fn hidpi_factor(&self) -> f64 {
self.hidpi
}
/// Updates the width and height of the screen and recomputes the aspect
/// ratio.
///
/// Only use this if you need to programmatically set the resolution of your game.
/// This resource is updated automatically by the engine when a resize occurs so you don't need
/// this unless you want to resize the game window.
pub fn update(&mut self, w: f64, h: f64) {
self.w = w;
self.h = h;
self.aspect_ratio = w as f32 / h as f32;
self.dirty = true;
}
/// Updates the hidpi factor stored in this structure.
///
/// Amethyst will call this for you automatically, most engine users won't need this.
pub fn update_hidpi_factor(&mut self, factor: f64) {
self.hidpi = factor;
}
}