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Diffstat (limited to 'gfx/wr/webrender/src/surface.rs')
| -rw-r--r-- | gfx/wr/webrender/src/surface.rs | 612 |
1 files changed, 612 insertions, 0 deletions
diff --git a/gfx/wr/webrender/src/surface.rs b/gfx/wr/webrender/src/surface.rs new file mode 100644 index 0000000000..44be7ae279 --- /dev/null +++ b/gfx/wr/webrender/src/surface.rs @@ -0,0 +1,612 @@ +/* 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::units::*; +use crate::command_buffer::{CommandBufferBuilderKind, CommandBufferList, CommandBufferBuilder, CommandBufferIndex}; +use crate::internal_types::FastHashMap; +use crate::picture::{SurfaceInfo, SurfaceIndex, TileKey, SubSliceIndex, MAX_COMPOSITOR_SURFACES}; +use crate::prim_store::{PictureIndex}; +use crate::render_task_graph::{RenderTaskId, RenderTaskGraphBuilder}; +use crate::render_target::ResolveOp; +use crate::render_task::{RenderTask, RenderTaskKind, RenderTaskLocation}; +use crate::visibility::{VisibilityState, PrimitiveVisibility}; + +/* + Contains functionality to help building the render task graph from a series of off-screen + surfaces that are created during the prepare pass. For now, it maintains existing behavior. + A future patch will add support for surface sub-graphs, while ensuring the render task + graph itself is built correctly with dependencies regardless of the surface kind (chained, + tiled, simple). + */ + +// Information about the render task(s) for a given tile +#[cfg_attr(feature = "capture", derive(Serialize))] +#[cfg_attr(feature = "replay", derive(Deserialize))] +pub struct SurfaceTileDescriptor { + /// Target render task for commands added to this tile. This is changed + /// each time a sub-graph is encountered on this tile + pub current_task_id: RenderTaskId, + /// The compositing task for this tile, if required. This is only needed + /// when a tile contains one or more sub-graphs. + pub composite_task_id: Option<RenderTaskId>, + /// Dirty rect for this tile + pub dirty_rect: PictureRect, +} + +// Details of how a surface is rendered +pub enum SurfaceDescriptorKind { + // Picture cache tiles + Tiled { + tiles: FastHashMap<TileKey, SurfaceTileDescriptor>, + }, + // A single surface (e.g. for an opacity filter) + Simple { + render_task_id: RenderTaskId, + dirty_rect: PictureRect, + }, + // A surface with 1+ intermediate tasks (e.g. blur) + Chained { + render_task_id: RenderTaskId, + root_task_id: RenderTaskId, + dirty_rect: PictureRect, + }, +} + +// Describes how a surface is rendered +pub struct SurfaceDescriptor { + kind: SurfaceDescriptorKind, +} + +impl SurfaceDescriptor { + // Create a picture cache tiled surface + pub fn new_tiled( + tiles: FastHashMap<TileKey, SurfaceTileDescriptor>, + ) -> Self { + SurfaceDescriptor { + kind: SurfaceDescriptorKind::Tiled { + tiles, + }, + } + } + + // Create a chained surface (e.g. blur) + pub fn new_chained( + render_task_id: RenderTaskId, + root_task_id: RenderTaskId, + dirty_rect: PictureRect, + ) -> Self { + SurfaceDescriptor { + kind: SurfaceDescriptorKind::Chained { + render_task_id, + root_task_id, + dirty_rect, + }, + } + } + + // Create a simple surface (e.g. opacity) + pub fn new_simple( + render_task_id: RenderTaskId, + dirty_rect: PictureRect, + ) -> Self { + SurfaceDescriptor { + kind: SurfaceDescriptorKind::Simple { + render_task_id, + dirty_rect, + }, + } + } +} + +// Describes a list of command buffers that we are adding primitives to +// for a given surface. These are created from a command buffer builder +// as an optimization - skipping the indirection pic_task -> cmd_buffer_index +struct CommandBufferTargets { + available_cmd_buffers: Vec<Vec<(PictureRect, CommandBufferIndex)>>, +} + +impl CommandBufferTargets { + fn new() -> Self { + CommandBufferTargets { + available_cmd_buffers: vec![Vec::new(); MAX_COMPOSITOR_SURFACES+1], + } + } + + fn init( + &mut self, + cb: &CommandBufferBuilder, + rg_builder: &RenderTaskGraphBuilder, + ) { + for available_cmd_buffers in &mut self.available_cmd_buffers { + available_cmd_buffers.clear(); + } + + match cb.kind { + CommandBufferBuilderKind::Tiled { ref tiles, .. } => { + for (key, desc) in tiles { + let task = rg_builder.get_task(desc.current_task_id); + match task.kind { + RenderTaskKind::Picture(ref info) => { + let available_cmd_buffers = &mut self.available_cmd_buffers[key.sub_slice_index.as_usize()]; + available_cmd_buffers.push((desc.dirty_rect, info.cmd_buffer_index)); + } + _ => unreachable!("bug: not a picture"), + } + } + } + CommandBufferBuilderKind::Simple { render_task_id, dirty_rect, .. } => { + let task = rg_builder.get_task(render_task_id); + match task.kind { + RenderTaskKind::Picture(ref info) => { + for sub_slice_buffer in &mut self.available_cmd_buffers { + sub_slice_buffer.push((dirty_rect, info.cmd_buffer_index)); + } + } + _ => unreachable!("bug: not a picture"), + } + } + CommandBufferBuilderKind::Invalid => {} + }; + } + + /// For a given rect and sub-slice, get a list of command buffers to write commands to + fn get_cmd_buffer_targets_for_rect( + &mut self, + rect: &PictureRect, + sub_slice_index: SubSliceIndex, + targets: &mut Vec<CommandBufferIndex>, + ) -> bool { + + for (dirty_rect, cmd_buffer_index) in &self.available_cmd_buffers[sub_slice_index.as_usize()] { + if dirty_rect.intersects(rect) { + targets.push(*cmd_buffer_index); + } + } + + !targets.is_empty() + } +} + +// Main helper interface to build a graph of surfaces. In future patches this +// will support building sub-graphs. +pub struct SurfaceBuilder { + // The currently set cmd buffer targets (updated during push/pop) + current_cmd_buffers: CommandBufferTargets, + // Stack of surfaces that are parents to the current targets + builder_stack: Vec<CommandBufferBuilder>, + // A map of the output render tasks from any sub-graphs that haven't + // been consumed by BackdropRender prims yet + pub sub_graph_output_map: FastHashMap<PictureIndex, RenderTaskId>, +} + +impl SurfaceBuilder { + pub fn new() -> Self { + SurfaceBuilder { + current_cmd_buffers: CommandBufferTargets::new(), + builder_stack: Vec::new(), + sub_graph_output_map: FastHashMap::default(), + } + } + + /// Register the current surface as the source of a resolve for the task sub-graph that + /// is currently on the surface builder stack. + pub fn register_resolve_source( + &mut self, + ) { + let surface_task_id = match self.builder_stack.last().unwrap().kind { + CommandBufferBuilderKind::Tiled { .. } | CommandBufferBuilderKind::Invalid => { + panic!("bug: only supported for non-tiled surfaces"); + } + CommandBufferBuilderKind::Simple { render_task_id, .. } => render_task_id, + }; + + for builder in self.builder_stack.iter_mut().rev() { + if builder.establishes_sub_graph { + assert_eq!(builder.resolve_source, None); + builder.resolve_source = Some(surface_task_id); + return; + } + } + + unreachable!("bug: resolve source with no sub-graph"); + } + + pub fn push_surface( + &mut self, + surface_index: SurfaceIndex, + is_sub_graph: bool, + clipping_rect: PictureRect, + descriptor: SurfaceDescriptor, + surfaces: &mut [SurfaceInfo], + rg_builder: &RenderTaskGraphBuilder, + ) { + // Init the surface + surfaces[surface_index.0].clipping_rect = clipping_rect; + + let builder = match descriptor.kind { + SurfaceDescriptorKind::Tiled { tiles } => { + CommandBufferBuilder::new_tiled( + tiles, + ) + } + SurfaceDescriptorKind::Simple { render_task_id, dirty_rect, .. } => { + CommandBufferBuilder::new_simple( + render_task_id, + is_sub_graph, + None, + dirty_rect, + ) + } + SurfaceDescriptorKind::Chained { render_task_id, root_task_id, dirty_rect, .. } => { + CommandBufferBuilder::new_simple( + render_task_id, + is_sub_graph, + Some(root_task_id), + dirty_rect, + ) + } + }; + + self.current_cmd_buffers.init(&builder, rg_builder); + self.builder_stack.push(builder); + } + + // Add a child render task (e.g. a render task cache item, or a clip mask) as a + // dependency of the current surface + pub fn add_child_render_task( + &mut self, + child_task_id: RenderTaskId, + rg_builder: &mut RenderTaskGraphBuilder, + ) { + let builder = self.builder_stack.last().unwrap(); + + match builder.kind { + CommandBufferBuilderKind::Tiled { ref tiles } => { + for (_, descriptor) in tiles { + rg_builder.add_dependency( + descriptor.current_task_id, + child_task_id, + ); + } + } + CommandBufferBuilderKind::Simple { render_task_id, .. } => { + rg_builder.add_dependency( + render_task_id, + child_task_id, + ); + } + CommandBufferBuilderKind::Invalid { .. } => {} + } + } + + // Add a picture render task as a dependency of the parent surface. This is a + // special case with extra complexity as the root of the surface may change + // when inside a sub-graph. It's currently only needed for drop-shadow effects. + pub fn add_picture_render_task( + &mut self, + child_task_id: RenderTaskId, + ) { + self.builder_stack + .last_mut() + .unwrap() + .extra_dependencies + .push(child_task_id); + } + + // Get a list of command buffer indices that primitives should be pushed + // to for a given current visbility / dirty state + pub fn get_cmd_buffer_targets_for_prim( + &mut self, + vis: &PrimitiveVisibility, + targets: &mut Vec<CommandBufferIndex>, + ) -> bool { + targets.clear(); + + match vis.state { + VisibilityState::Unset => { + panic!("bug: invalid vis state"); + } + VisibilityState::Culled => { + false + } + VisibilityState::Visible { sub_slice_index, .. } => { + self.current_cmd_buffers.get_cmd_buffer_targets_for_rect( + &vis.clip_chain.pic_coverage_rect, + sub_slice_index, + targets, + ) + } + VisibilityState::PassThrough => { + true + } + } + } + + // Finish adding primitives and child tasks to a surface and pop it off the stack + pub fn pop_surface( + &mut self, + pic_index: PictureIndex, + rg_builder: &mut RenderTaskGraphBuilder, + cmd_buffers: &mut CommandBufferList, + ) { + let builder = self.builder_stack.pop().unwrap(); + + if builder.establishes_sub_graph { + // If we are popping a sub-graph off the stack the dependency setup is rather more complex... + match builder.kind { + CommandBufferBuilderKind::Tiled { .. } | CommandBufferBuilderKind::Invalid => { + unreachable!("bug: sub-graphs can only be simple surfaces"); + } + CommandBufferBuilderKind::Simple { render_task_id: child_render_task_id, root_task_id: child_root_task_id, .. } => { + // Get info about the resolve operation to copy from parent surface or tiles to the picture cache task + if let Some(resolve_task_id) = builder.resolve_source { + let mut src_task_ids = Vec::new(); + + // Make the output of the sub-graph a dependency of the new replacement tile task + let _old = self.sub_graph_output_map.insert( + pic_index, + child_root_task_id.unwrap_or(child_render_task_id), + ); + debug_assert!(_old.is_none()); + + // Set up dependencies for the sub-graph. The basic concepts below are the same, but for + // tiled surfaces are a little more complex as there are multiple tasks to set up. + // (a) Set up new task(s) on parent surface that write to the same location + // (b) Set up a resolve target to copy from parent surface tasks(s) to the resolve target + // (c) Make the old parent surface tasks input dependencies of the resolve target + // (d) Make the sub-graph output an input dependency of the new task(s). + + match self.builder_stack.last_mut().unwrap().kind { + CommandBufferBuilderKind::Tiled { ref mut tiles } => { + let keys: Vec<TileKey> = tiles.keys().cloned().collect(); + + // For each tile in parent surface + for key in keys { + let descriptor = tiles.remove(&key).unwrap(); + let parent_task_id = descriptor.current_task_id; + let parent_task = rg_builder.get_task_mut(parent_task_id); + + match parent_task.location { + RenderTaskLocation::Unallocated { .. } | RenderTaskLocation::Existing { .. } => { + // Get info about the parent tile task location and params + let location = RenderTaskLocation::Existing { + parent_task_id, + size: parent_task.location.size(), + }; + + let pic_task = match parent_task.kind { + RenderTaskKind::Picture(ref mut pic_task) => { + let cmd_buffer_index = cmd_buffers.create_cmd_buffer(); + let new_pic_task = pic_task.duplicate(cmd_buffer_index); + + // Add the resolve src to copy from tile -> picture input task + src_task_ids.push(parent_task_id); + + new_pic_task + } + _ => panic!("bug: not a picture"), + }; + + // Make the existing tile an input dependency of the resolve target + rg_builder.add_dependency( + resolve_task_id, + parent_task_id, + ); + + // Create the new task to replace the tile task + let new_task_id = rg_builder.add().init( + RenderTask::new( + location, // draw to same place + RenderTaskKind::Picture(pic_task), + ), + ); + + // Ensure that the parent task will get scheduled earlier during + // pass assignment since we are reusing the existing surface, + // even though it's not technically needed for rendering order. + rg_builder.add_dependency( + new_task_id, + parent_task_id, + ); + + // Update the surface builder with the now current target for future primitives + tiles.insert( + key, + SurfaceTileDescriptor { + current_task_id: new_task_id, + ..descriptor + }, + ); + } + RenderTaskLocation::Static { .. } => { + // Update the surface builder with the now current target for future primitives + tiles.insert( + key, + descriptor, + ); + } + _ => { + panic!("bug: unexpected task location"); + } + } + } + } + CommandBufferBuilderKind::Simple { render_task_id: ref mut parent_task_id, .. } => { + let parent_task = rg_builder.get_task_mut(*parent_task_id); + + // Get info about the parent tile task location and params + let location = RenderTaskLocation::Existing { + parent_task_id: *parent_task_id, + size: parent_task.location.size(), + }; + let pic_task = match parent_task.kind { + RenderTaskKind::Picture(ref mut pic_task) => { + let cmd_buffer_index = cmd_buffers.create_cmd_buffer(); + + let new_pic_task = pic_task.duplicate(cmd_buffer_index); + + // Add the resolve src to copy from tile -> picture input task + src_task_ids.push(*parent_task_id); + + new_pic_task + } + _ => panic!("bug: not a picture"), + }; + + // Make the existing surface an input dependency of the resolve target + rg_builder.add_dependency( + resolve_task_id, + *parent_task_id, + ); + + // Create the new task to replace the parent surface task + let new_task_id = rg_builder.add().init( + RenderTask::new( + location, // draw to same place + RenderTaskKind::Picture(pic_task), + ), + ); + + // Ensure that the parent task will get scheduled earlier during + // pass assignment since we are reusing the existing surface, + // even though it's not technically needed for rendering order. + rg_builder.add_dependency( + new_task_id, + *parent_task_id, + ); + + // Update the surface builder with the now current target for future primitives + *parent_task_id = new_task_id; + } + CommandBufferBuilderKind::Invalid => { + unreachable!(); + } + } + + let dest_task = rg_builder.get_task_mut(resolve_task_id); + + match dest_task.kind { + RenderTaskKind::Picture(ref mut dest_task_info) => { + assert!(dest_task_info.resolve_op.is_none()); + dest_task_info.resolve_op = Some(ResolveOp { + src_task_ids, + dest_task_id: resolve_task_id, + }) + } + _ => { + unreachable!("bug: not a picture"); + } + } + } + + // This can occur if there is an edge case where the resolve target is found + // not visible even though the filter chain was (for example, in the case of + // an extreme scale causing floating point inaccuracies). Adding a dependency + // here is also a safety in case for some reason the backdrop render primitive + // doesn't pick up the dependency, ensuring that it gets scheduled and freed + // as early as possible. + match self.builder_stack.last().unwrap().kind { + CommandBufferBuilderKind::Tiled { ref tiles } => { + // For a tiled render task, add as a dependency to every tile. + for (_, descriptor) in tiles { + rg_builder.add_dependency( + descriptor.current_task_id, + child_root_task_id.unwrap_or(child_render_task_id), + ); + } + } + CommandBufferBuilderKind::Simple { render_task_id: parent_task_id, .. } => { + rg_builder.add_dependency( + parent_task_id, + child_root_task_id.unwrap_or(child_render_task_id), + ); + } + CommandBufferBuilderKind::Invalid => { + unreachable!(); + } + } + } + } + } else { + match builder.kind { + CommandBufferBuilderKind::Tiled { ref tiles } => { + for (_, descriptor) in tiles { + if let Some(composite_task_id) = descriptor.composite_task_id { + rg_builder.add_dependency( + composite_task_id, + descriptor.current_task_id, + ); + + let composite_task = rg_builder.get_task_mut(composite_task_id); + match composite_task.kind { + RenderTaskKind::TileComposite(ref mut info) => { + info.task_id = Some(descriptor.current_task_id); + } + _ => unreachable!("bug: not a tile composite"), + } + } + } + } + CommandBufferBuilderKind::Simple { render_task_id: child_task_id, root_task_id: child_root_task_id, .. } => { + match self.builder_stack.last().unwrap().kind { + CommandBufferBuilderKind::Tiled { ref tiles } => { + // For a tiled render task, add as a dependency to every tile. + for (_, descriptor) in tiles { + rg_builder.add_dependency( + descriptor.current_task_id, + child_root_task_id.unwrap_or(child_task_id), + ); + } + } + CommandBufferBuilderKind::Simple { render_task_id: parent_task_id, .. } => { + rg_builder.add_dependency( + parent_task_id, + child_root_task_id.unwrap_or(child_task_id), + ); + } + CommandBufferBuilderKind::Invalid => { + unreachable!(); + } + } + } + CommandBufferBuilderKind::Invalid => { + unreachable!(); + } + } + } + + // Step through the dependencies for this builder and add them to the finalized + // render task root(s) for this surface + match builder.kind { + CommandBufferBuilderKind::Tiled { ref tiles } => { + for (_, descriptor) in tiles { + for task_id in &builder.extra_dependencies { + rg_builder.add_dependency( + descriptor.current_task_id, + *task_id, + ); + } + } + } + CommandBufferBuilderKind::Simple { render_task_id, .. } => { + for task_id in &builder.extra_dependencies { + rg_builder.add_dependency( + render_task_id, + *task_id, + ); + } + } + CommandBufferBuilderKind::Invalid { .. } => {} + } + + // Set up the cmd-buffer targets to write prims into the popped surface + self.current_cmd_buffers.init( + self.builder_stack.last().unwrap_or(&CommandBufferBuilder::empty()), rg_builder + ); + } + + pub fn finalize(self) { + assert!(self.builder_stack.is_empty()); + } +} |