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62a8b15f09
To avoid ambiguities regarding the use of FieldOffset, the BuiltinItem proc-macro uses fully-qualified type names now.
68 lines
2.5 KiB
Rust
68 lines
2.5 KiB
Rust
use super::graphics::{Frame, GraphicsBackend, RenderingCache, RenderingPrimitivesBuilder};
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use super::items::ItemRef;
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use crate::item_tree::ItemVisitorResult;
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use cgmath::{Matrix4, SquareMatrix, Vector3};
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use std::cell::Cell;
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/// This structure must be present in items that are Rendered and contains information.
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/// Used by the backend.
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#[derive(Default, Debug)]
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#[repr(C)]
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pub struct CachedRenderingData {
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/// Used and modified by the backend, should be initialized to 0 by the user code
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pub(crate) cache_index: Cell<usize>,
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/// Set to false initially and when changes happen that require updating the cache
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pub(crate) cache_ok: Cell<bool>,
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}
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impl CachedRenderingData {
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pub(crate) fn ensure_up_to_date<'a, Backend: GraphicsBackend>(
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&self,
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cache: &'a mut RenderingCache<Backend>,
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item: core::pin::Pin<ItemRef>,
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rendering_primitives_builder: &mut Backend::RenderingPrimitivesBuilder,
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) {
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let idx = if self.cache_ok.get() { Some(self.cache_index.get()) } else { None };
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self.cache_index.set(cache.ensure_cached(idx, || {
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rendering_primitives_builder.create(item.as_ref().rendering_primitive())
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}));
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self.cache_ok.set(true);
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}
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}
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pub(crate) fn update_item_rendering_data<Backend: GraphicsBackend>(
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item: core::pin::Pin<ItemRef>,
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rendering_cache: &mut RenderingCache<Backend>,
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rendering_primitives_builder: &mut Backend::RenderingPrimitivesBuilder,
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) {
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let rendering_data = item.cached_rendering_data_offset();
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rendering_data.ensure_up_to_date(rendering_cache, item, rendering_primitives_builder);
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}
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pub(crate) fn render_component_items<Backend: GraphicsBackend>(
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component: crate::ComponentRefPin,
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frame: &mut Backend::Frame,
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rendering_cache: &RenderingCache<Backend>,
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) {
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let transform = Matrix4::identity();
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crate::item_tree::visit_items(
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component,
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crate::item_tree::TraversalOrder::BackToFront,
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|_, item, transform| {
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let origin = item.as_ref().geometry().origin;
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let transform =
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transform * Matrix4::from_translation(Vector3::new(origin.x, origin.y, 0.));
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let cached_rendering_data = item.cached_rendering_data_offset();
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if cached_rendering_data.cache_ok.get() {
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let primitive = rendering_cache.entry_at(cached_rendering_data.cache_index.get());
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frame.render_primitive(&primitive, &transform, item.as_ref().rendering_variables());
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}
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ItemVisitorResult::Continue(transform)
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},
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transform,
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);
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}
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