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-rw-r--r--gfx/wr/webrender/src/tile_cache.rs745
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diff --git a/gfx/wr/webrender/src/tile_cache.rs b/gfx/wr/webrender/src/tile_cache.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use api::{ColorF, PrimitiveFlags, QualitySettings, RasterSpace, ClipId};
+use api::units::*;
+use crate::clip::{ClipNodeKind, ClipLeafId, ClipNodeId, ClipTreeBuilder};
+use crate::frame_builder::FrameBuilderConfig;
+use crate::internal_types::{FastHashMap};
+use crate::picture::{PrimitiveList, PictureCompositeMode, PicturePrimitive, SliceId};
+use crate::picture::{Picture3DContext, TileCacheParams, TileOffset, PictureFlags};
+use crate::prim_store::{PrimitiveInstance, PrimitiveStore, PictureIndex};
+use crate::scene_building::SliceFlags;
+use crate::scene_builder_thread::Interners;
+use crate::spatial_tree::{SpatialNodeIndex, SceneSpatialTree};
+use crate::util::VecHelper;
+use std::mem;
+
+/*
+ Types and functionality related to picture caching. In future, we'll
+ move more and more of the existing functionality out of picture.rs
+ and into here.
+ */
+
+// If the page would create too many slices (an arbitrary definition where
+// it's assumed the GPU memory + compositing overhead would be too high)
+// then create a single picture cache for the remaining content. This at
+// least means that we can cache small content changes efficiently when
+// scrolling isn't occurring. Scrolling regions will be handled reasonably
+// efficiently by the dirty rect tracking (since it's likely that if the
+// page has so many slices there isn't a single major scroll region).
+const MAX_CACHE_SLICES: usize = 12;
+
+struct SliceDescriptor {
+ prim_list: PrimitiveList,
+ scroll_root: SpatialNodeIndex,
+ shared_clip_node_id: ClipNodeId,
+}
+
+enum SliceKind {
+ Default {
+ secondary_slices: Vec<SliceDescriptor>,
+ },
+ Atomic {
+ prim_list: PrimitiveList,
+ },
+}
+
+impl SliceKind {
+ fn default() -> Self {
+ SliceKind::Default {
+ secondary_slices: Vec::new(),
+ }
+ }
+}
+
+struct PrimarySlice {
+ /// Whether this slice is atomic or has secondary slice(s)
+ kind: SliceKind,
+ /// Optional background color of this slice
+ background_color: Option<ColorF>,
+ /// Optional root clip for the iframe
+ iframe_clip: Option<ClipId>,
+ /// Information about how to draw and composite this slice
+ slice_flags: SliceFlags,
+}
+
+impl PrimarySlice {
+ fn new(
+ slice_flags: SliceFlags,
+ iframe_clip: Option<ClipId>,
+ background_color: Option<ColorF>,
+ ) -> Self {
+ PrimarySlice {
+ kind: SliceKind::default(),
+ background_color,
+ iframe_clip,
+ slice_flags,
+ }
+ }
+
+ fn has_too_many_slices(&self) -> bool {
+ match self.kind {
+ SliceKind::Atomic { .. } => false,
+ SliceKind::Default { ref secondary_slices } => secondary_slices.len() > MAX_CACHE_SLICES,
+ }
+ }
+
+ fn merge(&mut self) {
+ self.slice_flags |= SliceFlags::IS_ATOMIC;
+
+ let old = mem::replace(
+ &mut self.kind,
+ SliceKind::Default { secondary_slices: Vec::new() },
+ );
+
+ self.kind = match old {
+ SliceKind::Default { mut secondary_slices } => {
+ let mut prim_list = PrimitiveList::empty();
+
+ for descriptor in secondary_slices.drain(..) {
+ prim_list.merge(descriptor.prim_list);
+ }
+
+ SliceKind::Atomic {
+ prim_list,
+ }
+ }
+ atomic => atomic,
+ }
+ }
+}
+
+/// Used during scene building to construct the list of pending tile caches.
+pub struct TileCacheBuilder {
+ /// List of tile caches that have been created so far (last in the list is currently active).
+ primary_slices: Vec<PrimarySlice>,
+ /// Cache the previous scroll root search for a spatial node, since they are often the same.
+ prev_scroll_root_cache: (SpatialNodeIndex, SpatialNodeIndex),
+ /// Handle to the root reference frame
+ root_spatial_node_index: SpatialNodeIndex,
+}
+
+/// The output of a tile cache builder, containing all details needed to construct the
+/// tile cache(s) for the next scene, and retain tiles from the previous frame when sent
+/// send to the frame builder.
+pub struct TileCacheConfig {
+ /// Mapping of slice id to the parameters needed to construct this tile cache.
+ pub tile_caches: FastHashMap<SliceId, TileCacheParams>,
+ /// Number of picture cache slices that were created (for profiler)
+ pub picture_cache_slice_count: usize,
+}
+
+impl TileCacheConfig {
+ pub fn new(picture_cache_slice_count: usize) -> Self {
+ TileCacheConfig {
+ tile_caches: FastHashMap::default(),
+ picture_cache_slice_count,
+ }
+ }
+}
+
+impl TileCacheBuilder {
+ /// Construct a new tile cache builder.
+ pub fn new(
+ root_spatial_node_index: SpatialNodeIndex,
+ background_color: Option<ColorF>,
+ ) -> Self {
+ TileCacheBuilder {
+ primary_slices: vec![PrimarySlice::new(SliceFlags::empty(), None, background_color)],
+ prev_scroll_root_cache: (SpatialNodeIndex::INVALID, SpatialNodeIndex::INVALID),
+ root_spatial_node_index,
+ }
+ }
+
+ pub fn make_current_slice_atomic(&mut self) {
+ self.primary_slices
+ .last_mut()
+ .unwrap()
+ .merge();
+ }
+
+ /// Returns true if the current slice has no primitives added yet
+ pub fn is_current_slice_empty(&self) -> bool {
+ match self.primary_slices.last() {
+ Some(slice) => {
+ match slice.kind {
+ SliceKind::Default { ref secondary_slices } => {
+ secondary_slices.is_empty()
+ }
+ SliceKind::Atomic { ref prim_list } => {
+ prim_list.is_empty()
+ }
+ }
+ }
+ None => {
+ true
+ }
+ }
+ }
+
+ /// Set a barrier that forces a new tile cache next time a prim is added.
+ pub fn add_tile_cache_barrier(
+ &mut self,
+ slice_flags: SliceFlags,
+ iframe_clip: Option<ClipId>,
+ ) {
+ let new_slice = PrimarySlice::new(
+ slice_flags,
+ iframe_clip,
+ None,
+ );
+
+ self.primary_slices.push(new_slice);
+ }
+
+ /// Create a new tile cache for an existing prim_list
+ fn build_tile_cache(
+ &mut self,
+ prim_list: PrimitiveList,
+ spatial_tree: &SceneSpatialTree,
+ prim_instances: &[PrimitiveInstance],
+ clip_tree_builder: &ClipTreeBuilder,
+ ) -> Option<SliceDescriptor> {
+ if prim_list.is_empty() {
+ return None;
+ }
+
+ // Iterate the clusters and determine which is the most commonly occurring
+ // scroll root. This is a reasonable heuristic to decide which spatial node
+ // should be considered the scroll root of this tile cache, in order to
+ // minimize the invalidations that occur due to scrolling. It's often the
+ // case that a blend container will have only a single scroll root.
+ let mut scroll_root_occurrences = FastHashMap::default();
+
+ for cluster in &prim_list.clusters {
+ // If we encounter a cluster which has an unknown spatial node,
+ // we don't include that in the set of spatial nodes that we
+ // are trying to find scroll roots for. Later on, in finalize_picture,
+ // the cluster spatial node will be updated to the selected scroll root.
+ if cluster.spatial_node_index == SpatialNodeIndex::UNKNOWN {
+ continue;
+ }
+
+ let scroll_root = find_scroll_root(
+ cluster.spatial_node_index,
+ &mut self.prev_scroll_root_cache,
+ spatial_tree,
+ );
+
+ *scroll_root_occurrences.entry(scroll_root).or_insert(0) += 1;
+ }
+
+ // We can't just select the most commonly occurring scroll root in this
+ // primitive list. If that is a nested scroll root, there may be
+ // primitives in the list that are outside that scroll root, which
+ // can cause panics when calculating relative transforms. To ensure
+ // this doesn't happen, only retain scroll root candidates that are
+ // also ancestors of every other scroll root candidate.
+ let scroll_roots: Vec<SpatialNodeIndex> = scroll_root_occurrences
+ .keys()
+ .cloned()
+ .collect();
+
+ scroll_root_occurrences.retain(|parent_spatial_node_index, _| {
+ scroll_roots.iter().all(|child_spatial_node_index| {
+ parent_spatial_node_index == child_spatial_node_index ||
+ spatial_tree.is_ancestor(
+ *parent_spatial_node_index,
+ *child_spatial_node_index,
+ )
+ })
+ });
+
+ // Select the scroll root by finding the most commonly occurring one
+ let scroll_root = scroll_root_occurrences
+ .iter()
+ .max_by_key(|entry | entry.1)
+ .map(|(spatial_node_index, _)| *spatial_node_index)
+ .unwrap_or(self.root_spatial_node_index);
+
+ // Work out which clips are shared by all prim instances and can thus be applied
+ // at the tile cache level. In future, we aim to remove this limitation by knowing
+ // during initial scene build which are the relevant compositor clips, but for now
+ // this is unlikely to be a significant cost.
+ let mut shared_clip_node_id = None;
+
+ for cluster in &prim_list.clusters {
+ for prim_instance in &prim_instances[cluster.prim_range()] {
+ let leaf = clip_tree_builder.get_leaf(prim_instance.clip_leaf_id);
+
+ // TODO(gw): Need to cache last clip-node id here?
+ shared_clip_node_id = match shared_clip_node_id {
+ Some(current) => {
+ Some(clip_tree_builder.find_lowest_common_ancestor(current, leaf.node_id))
+ }
+ None => {
+ Some(leaf.node_id)
+ }
+ }
+ }
+ }
+
+ let shared_clip_node_id = shared_clip_node_id.expect("bug: no shared clip root");
+
+ Some(SliceDescriptor {
+ scroll_root,
+ shared_clip_node_id,
+ prim_list,
+ })
+ }
+
+ /// Add a primitive, either to the current tile cache, or a new one, depending on various conditions.
+ pub fn add_prim(
+ &mut self,
+ prim_instance: PrimitiveInstance,
+ prim_rect: LayoutRect,
+ spatial_node_index: SpatialNodeIndex,
+ prim_flags: PrimitiveFlags,
+ spatial_tree: &SceneSpatialTree,
+ interners: &Interners,
+ quality_settings: &QualitySettings,
+ prim_instances: &mut Vec<PrimitiveInstance>,
+ clip_tree_builder: &ClipTreeBuilder,
+ ) {
+ let primary_slice = self.primary_slices.last_mut().unwrap();
+
+ match primary_slice.kind {
+ SliceKind::Atomic { ref mut prim_list } => {
+ prim_list.add_prim(
+ prim_instance,
+ prim_rect,
+ spatial_node_index,
+ prim_flags,
+ prim_instances,
+ clip_tree_builder,
+ );
+ }
+ SliceKind::Default { ref mut secondary_slices } => {
+ assert_ne!(spatial_node_index, SpatialNodeIndex::UNKNOWN);
+
+ // Check if we want to create a new slice based on the current / next scroll root
+ let scroll_root = find_scroll_root(
+ spatial_node_index,
+ &mut self.prev_scroll_root_cache,
+ spatial_tree,
+ );
+
+ let current_scroll_root = secondary_slices
+ .last()
+ .map(|p| p.scroll_root);
+
+ let mut want_new_tile_cache = secondary_slices.is_empty();
+
+ if let Some(current_scroll_root) = current_scroll_root {
+ want_new_tile_cache |= match (current_scroll_root, scroll_root) {
+ (_, _) if current_scroll_root == self.root_spatial_node_index && scroll_root == self.root_spatial_node_index => {
+ // Both current slice and this cluster are fixed position, no need to cut
+ false
+ }
+ (_, _) if current_scroll_root == self.root_spatial_node_index => {
+ // A real scroll root is being established, so create a cache slice
+ true
+ }
+ (_, _) if scroll_root == self.root_spatial_node_index => {
+ // If quality settings force subpixel AA over performance, skip creating
+ // a slice for the fixed position element(s) here.
+ if quality_settings.force_subpixel_aa_where_possible {
+ false
+ } else {
+ // A fixed position slice is encountered within a scroll root. Only create
+ // a slice in this case if all the clips referenced by this cluster are also
+ // fixed position. There's no real point in creating slices for these cases,
+ // since we'll have to rasterize them as the scrolling clip moves anyway. It
+ // also allows us to retain subpixel AA in these cases. For these types of
+ // slices, the intra-slice dirty rect handling typically works quite well
+ // (a common case is parallax scrolling effects).
+ let mut create_slice = true;
+
+ let leaf = clip_tree_builder.get_leaf(prim_instance.clip_leaf_id);
+ let mut current_node_id = leaf.node_id;
+
+ while current_node_id != ClipNodeId::NONE {
+ let node = clip_tree_builder.get_node(current_node_id);
+
+ let clip_node_data = &interners.clip[node.handle];
+
+ let spatial_root = find_scroll_root(
+ clip_node_data.key.spatial_node_index,
+ &mut self.prev_scroll_root_cache,
+ spatial_tree,
+ );
+
+ if spatial_root != self.root_spatial_node_index {
+ create_slice = false;
+ break;
+ }
+
+ current_node_id = node.parent;
+ }
+
+ create_slice
+ }
+ }
+ (curr_scroll_root, scroll_root) => {
+ // Two scrolling roots - only need a new slice if they differ
+ curr_scroll_root != scroll_root
+ }
+ };
+
+ // Update the list of clips that apply to this primitive instance, to track which are the
+ // shared clips for this tile cache that can be applied during compositing.
+
+ let shared_clip_node_id = find_shared_clip_root(
+ current_scroll_root,
+ prim_instance.clip_leaf_id,
+ spatial_tree,
+ clip_tree_builder,
+ interners,
+ );
+
+ let current_shared_clip_node_id = secondary_slices.last().unwrap().shared_clip_node_id;
+
+ // If the shared clips are not compatible, create a new slice.
+ want_new_tile_cache |= shared_clip_node_id != current_shared_clip_node_id;
+ }
+
+ if want_new_tile_cache {
+
+ let shared_clip_node_id = find_shared_clip_root(
+ scroll_root,
+ prim_instance.clip_leaf_id,
+ spatial_tree,
+ clip_tree_builder,
+ interners,
+ );
+
+ secondary_slices.push(SliceDescriptor {
+ prim_list: PrimitiveList::empty(),
+ scroll_root,
+ shared_clip_node_id,
+ });
+ }
+
+ secondary_slices
+ .last_mut()
+ .unwrap()
+ .prim_list
+ .add_prim(
+ prim_instance,
+ prim_rect,
+ spatial_node_index,
+ prim_flags,
+ prim_instances,
+ clip_tree_builder,
+ );
+ }
+ }
+ }
+
+ /// Consume this object and build the list of tile cache primitives
+ pub fn build(
+ mut self,
+ config: &FrameBuilderConfig,
+ prim_store: &mut PrimitiveStore,
+ spatial_tree: &SceneSpatialTree,
+ prim_instances: &[PrimitiveInstance],
+ clip_tree_builder: &mut ClipTreeBuilder,
+ ) -> (TileCacheConfig, Vec<PictureIndex>) {
+ let mut result = TileCacheConfig::new(self.primary_slices.len());
+ let mut tile_cache_pictures = Vec::new();
+ let primary_slices = std::mem::replace(&mut self.primary_slices, Vec::new());
+
+ for mut primary_slice in primary_slices {
+
+ if primary_slice.has_too_many_slices() {
+ primary_slice.merge();
+ }
+
+ match primary_slice.kind {
+ SliceKind::Atomic { prim_list } => {
+ if let Some(descriptor) = self.build_tile_cache(
+ prim_list,
+ spatial_tree,
+ prim_instances,
+ clip_tree_builder,
+ ) {
+ create_tile_cache(
+ primary_slice.slice_flags,
+ descriptor.scroll_root,
+ primary_slice.iframe_clip,
+ descriptor.prim_list,
+ primary_slice.background_color,
+ descriptor.shared_clip_node_id,
+ prim_store,
+ config,
+ &mut result.tile_caches,
+ &mut tile_cache_pictures,
+ clip_tree_builder,
+ );
+ }
+ }
+ SliceKind::Default { secondary_slices } => {
+ for descriptor in secondary_slices {
+ create_tile_cache(
+ primary_slice.slice_flags,
+ descriptor.scroll_root,
+ primary_slice.iframe_clip,
+ descriptor.prim_list,
+ primary_slice.background_color,
+ descriptor.shared_clip_node_id,
+ prim_store,
+ config,
+ &mut result.tile_caches,
+ &mut tile_cache_pictures,
+ clip_tree_builder,
+ );
+ }
+ }
+ }
+ }
+
+ (result, tile_cache_pictures)
+ }
+}
+
+/// Find the scroll root for a given spatial node
+fn find_scroll_root(
+ spatial_node_index: SpatialNodeIndex,
+ prev_scroll_root_cache: &mut (SpatialNodeIndex, SpatialNodeIndex),
+ spatial_tree: &SceneSpatialTree,
+) -> SpatialNodeIndex {
+ if prev_scroll_root_cache.0 == spatial_node_index {
+ return prev_scroll_root_cache.1;
+ }
+
+ let scroll_root = spatial_tree.find_scroll_root(spatial_node_index);
+ *prev_scroll_root_cache = (spatial_node_index, scroll_root);
+
+ scroll_root
+}
+
+fn find_shared_clip_root(
+ scroll_root: SpatialNodeIndex,
+ clip_leaf_id: ClipLeafId,
+ spatial_tree: &SceneSpatialTree,
+ clip_tree_builder: &ClipTreeBuilder,
+ interners: &Interners,
+) -> ClipNodeId {
+ let leaf = clip_tree_builder.get_leaf(clip_leaf_id);
+ let mut current_node_id = leaf.node_id;
+
+ while current_node_id != ClipNodeId::NONE {
+ let node = clip_tree_builder.get_node(current_node_id);
+
+ let clip_node_data = &interners.clip[node.handle];
+
+ if let ClipNodeKind::Rectangle = clip_node_data.key.kind.node_kind() {
+ let is_ancestor = spatial_tree.is_ancestor(
+ clip_node_data.key.spatial_node_index,
+ scroll_root,
+ );
+
+ let has_complex_clips = clip_tree_builder.clip_node_has_complex_clips(
+ current_node_id,
+ interners,
+ );
+
+ if is_ancestor && !has_complex_clips {
+ break;
+ }
+ }
+
+ current_node_id = node.parent;
+ }
+
+ current_node_id
+}
+
+/// Given a PrimitiveList and scroll root, construct a tile cache primitive instance
+/// that wraps the primitive list.
+fn create_tile_cache(
+ slice_flags: SliceFlags,
+ scroll_root: SpatialNodeIndex,
+ iframe_clip: Option<ClipId>,
+ prim_list: PrimitiveList,
+ background_color: Option<ColorF>,
+ shared_clip_node_id: ClipNodeId,
+ prim_store: &mut PrimitiveStore,
+ frame_builder_config: &FrameBuilderConfig,
+ tile_caches: &mut FastHashMap<SliceId, TileCacheParams>,
+ tile_cache_pictures: &mut Vec<PictureIndex>,
+ clip_tree_builder: &mut ClipTreeBuilder,
+) {
+ // Accumulate any clip instances from the iframe_clip into the shared clips
+ // that will be applied by this tile cache during compositing.
+ let mut additional_clips = Vec::new();
+
+ if let Some(clip_id) = iframe_clip {
+ additional_clips.push(clip_id);
+ }
+
+ let shared_clip_leaf_id = Some(clip_tree_builder.build_for_tile_cache(
+ shared_clip_node_id,
+ &additional_clips,
+ ));
+
+ // Build a clip-chain for the tile cache, that contains any of the shared clips
+ // we will apply when drawing the tiles. In all cases provided by Gecko, these
+ // are rectangle clips with a scale/offset transform only, and get handled as
+ // a simple local clip rect in the vertex shader. However, this should in theory
+ // also work with any complex clips, such as rounded rects and image masks, by
+ // producing a clip mask that is applied to the picture cache tiles.
+
+ let slice = tile_cache_pictures.len();
+
+ let background_color = if slice == 0 {
+ background_color
+ } else {
+ None
+ };
+
+ let slice_id = SliceId::new(slice);
+
+ // Store some information about the picture cache slice. This is used when we swap the
+ // new scene into the frame builder to either reuse existing slices, or create new ones.
+ tile_caches.insert(slice_id, TileCacheParams {
+ slice,
+ slice_flags,
+ spatial_node_index: scroll_root,
+ background_color,
+ shared_clip_node_id,
+ shared_clip_leaf_id,
+ virtual_surface_size: frame_builder_config.compositor_kind.get_virtual_surface_size(),
+ compositor_surface_count: prim_list.compositor_surface_count,
+ });
+
+ let pic_index = prim_store.pictures.alloc().init(PicturePrimitive::new_image(
+ Some(PictureCompositeMode::TileCache { slice_id }),
+ Picture3DContext::Out,
+ PrimitiveFlags::IS_BACKFACE_VISIBLE,
+ prim_list,
+ scroll_root,
+ RasterSpace::Screen,
+ PictureFlags::empty(),
+ ));
+
+ tile_cache_pictures.push(PictureIndex(pic_index));
+}
+
+/// Debug information about a set of picture cache slices, exposed via RenderResults
+#[derive(Debug)]
+#[cfg_attr(feature = "capture", derive(Serialize))]
+#[cfg_attr(feature = "replay", derive(Deserialize))]
+pub struct PictureCacheDebugInfo {
+ pub slices: FastHashMap<usize, SliceDebugInfo>,
+}
+
+impl PictureCacheDebugInfo {
+ pub fn new() -> Self {
+ PictureCacheDebugInfo {
+ slices: FastHashMap::default(),
+ }
+ }
+
+ /// Convenience method to retrieve a given slice. Deliberately panics
+ /// if the slice isn't present.
+ pub fn slice(&self, slice: usize) -> &SliceDebugInfo {
+ &self.slices[&slice]
+ }
+}
+
+impl Default for PictureCacheDebugInfo {
+ fn default() -> PictureCacheDebugInfo {
+ PictureCacheDebugInfo::new()
+ }
+}
+
+/// Debug information about a set of picture cache tiles, exposed via RenderResults
+#[derive(Debug)]
+#[cfg_attr(feature = "capture", derive(Serialize))]
+#[cfg_attr(feature = "replay", derive(Deserialize))]
+pub struct SliceDebugInfo {
+ pub tiles: FastHashMap<TileOffset, TileDebugInfo>,
+}
+
+impl SliceDebugInfo {
+ pub fn new() -> Self {
+ SliceDebugInfo {
+ tiles: FastHashMap::default(),
+ }
+ }
+
+ /// Convenience method to retrieve a given tile. Deliberately panics
+ /// if the tile isn't present.
+ pub fn tile(&self, x: i32, y: i32) -> &TileDebugInfo {
+ &self.tiles[&TileOffset::new(x, y)]
+ }
+}
+
+/// Debug information about a tile that was dirty and was rasterized
+#[derive(Debug, PartialEq)]
+#[cfg_attr(feature = "capture", derive(Serialize))]
+#[cfg_attr(feature = "replay", derive(Deserialize))]
+pub struct DirtyTileDebugInfo {
+ pub local_valid_rect: PictureRect,
+ pub local_dirty_rect: PictureRect,
+}
+
+/// Debug information about the state of a tile
+#[derive(Debug, PartialEq)]
+#[cfg_attr(feature = "capture", derive(Serialize))]
+#[cfg_attr(feature = "replay", derive(Deserialize))]
+pub enum TileDebugInfo {
+ /// Tile was occluded by a tile in front of it
+ Occluded,
+ /// Tile was culled (not visible in current display port)
+ Culled,
+ /// Tile was valid (no rasterization was done) and visible
+ Valid,
+ /// Tile was dirty, and was updated
+ Dirty(DirtyTileDebugInfo),
+}
+
+impl TileDebugInfo {
+ pub fn is_occluded(&self) -> bool {
+ match self {
+ TileDebugInfo::Occluded => true,
+ TileDebugInfo::Culled |
+ TileDebugInfo::Valid |
+ TileDebugInfo::Dirty(..) => false,
+ }
+ }
+
+ pub fn is_valid(&self) -> bool {
+ match self {
+ TileDebugInfo::Valid => true,
+ TileDebugInfo::Culled |
+ TileDebugInfo::Occluded |
+ TileDebugInfo::Dirty(..) => false,
+ }
+ }
+
+ pub fn is_culled(&self) -> bool {
+ match self {
+ TileDebugInfo::Culled => true,
+ TileDebugInfo::Valid |
+ TileDebugInfo::Occluded |
+ TileDebugInfo::Dirty(..) => false,
+ }
+ }
+
+ pub fn as_dirty(&self) -> &DirtyTileDebugInfo {
+ match self {
+ TileDebugInfo::Occluded |
+ TileDebugInfo::Culled |
+ TileDebugInfo::Valid => {
+ panic!("not a dirty tile!");
+ }
+ TileDebugInfo::Dirty(ref info) => {
+ info
+ }
+ }
+ }
+}