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#![warn(missing_docs)]
use super::graphics::{
Frame, GraphicsBackend, GraphicsWindow, RenderingCache, RenderingPrimitivesBuilder,
};
use super::items::ItemRef;
use crate::component::ComponentRc;
use crate::eventloop::ComponentWindow;
use crate::item_tree::ItemVisitorResult;
use crate::slice::Slice;
use cgmath::{Matrix4, Vector3};
use std::cell::{Cell, RefCell};
#[derive(Default, Debug)]
#[repr(C)]
pub struct CachedRenderingData {
pub(crate) cache_index: Cell<usize>,
pub(crate) cache_ok: Cell<bool>,
}
impl CachedRenderingData {
pub(crate) fn ensure_up_to_date<Backend: GraphicsBackend>(
&self,
cache: &RefCell<RenderingCache<Backend>>,
item: core::pin::Pin<ItemRef>,
rendering_primitives_builder: &mut Backend::RenderingPrimitivesBuilder,
window: &std::rc::Rc<GraphicsWindow<Backend>>,
) {
let update_fn = || {
rendering_primitives_builder
.create(item.as_ref().rendering_primitive(&ComponentWindow::new(window.clone())))
};
if self.cache_ok.get() {
let index = self.cache_index.get();
let mut cache = cache.borrow_mut();
let existing_entry = cache.get_mut(index).unwrap();
if existing_entry.dependency_tracker.is_dirty() {
existing_entry.primitive =
existing_entry.dependency_tracker.as_ref().evaluate(update_fn)
}
} else {
self.cache_index.set(
cache
.borrow_mut()
.insert(crate::graphics::TrackingRenderingPrimitive::new(update_fn)),
);
self.cache_ok.set(true);
}
}
fn release<Backend: GraphicsBackend>(&self, cache: &RefCell<RenderingCache<Backend>>) {
if self.cache_ok.get() {
let index = self.cache_index.get();
cache.borrow_mut().remove(index);
}
}
}
pub(crate) fn update_item_rendering_data<Backend: GraphicsBackend>(
item: core::pin::Pin<ItemRef>,
rendering_cache: &RefCell<RenderingCache<Backend>>,
rendering_primitives_builder: &mut Backend::RenderingPrimitivesBuilder,
window: &std::rc::Rc<GraphicsWindow<Backend>>,
) {
let rendering_data = item.cached_rendering_data_offset();
rendering_data.ensure_up_to_date(rendering_cache, item, rendering_primitives_builder, window);
}
pub(crate) fn render_component_items<Backend: GraphicsBackend>(
component: &ComponentRc,
frame: &mut Backend::Frame,
rendering_cache: &RefCell<RenderingCache<Backend>>,
window: &std::rc::Rc<GraphicsWindow<Backend>>,
origin: crate::graphics::Point,
) {
let transform = Matrix4::from_translation(Vector3::new(origin.x, origin.y, 0.));
let window = ComponentWindow::new(window.clone());
let frame = RefCell::new(frame);
crate::item_tree::visit_items_with_post_visit(
component,
crate::item_tree::TraversalOrder::BackToFront,
|_, item, _, transform| {
let origin = item.as_ref().geometry().origin;
let transform =
transform * Matrix4::from_translation(Vector3::new(origin.x, origin.y, 0.));
let cached_rendering_data = item.cached_rendering_data_offset();
let cleanup_primitives = if cached_rendering_data.cache_ok.get() {
let cache = rendering_cache.borrow();
let primitive =
&cache.get(cached_rendering_data.cache_index.get()).unwrap().primitive;
frame.borrow_mut().render_primitive(
&primitive,
&transform,
item.as_ref().rendering_variables(&window),
)
} else {
Vec::new()
};
(ItemVisitorResult::Continue(transform), (transform, cleanup_primitives))
},
|_, _, (transform, cleanup_primitives)| {
cleanup_primitives.into_iter().for_each(|primitive| {
frame.borrow_mut().render_primitive(&primitive, &transform, Default::default());
})
},
transform,
);
}
pub(crate) fn free_item_rendering_data<'a, Backend: GraphicsBackend>(
items: &Slice<'a, core::pin::Pin<ItemRef<'a>>>,
rendering_cache: &RefCell<RenderingCache<Backend>>,
) {
for item in items.iter() {
let cached_rendering_data = item.cached_rendering_data_offset();
cached_rendering_data.release(rendering_cache);
}
}