98 lines
3.4 KiB
Rust
98 lines
3.4 KiB
Rust
// pathfinder/renderer/src/z_buffer.rs
|
|
//
|
|
// Copyright © 2019 The Pathfinder Project Developers.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
//! Software occlusion culling.
|
|
|
|
use crate::gpu_data::SolidTileBatchPrimitive;
|
|
use crate::paint;
|
|
use crate::scene::PathObject;
|
|
use crate::tile_map::DenseTileMap;
|
|
use crate::tiles;
|
|
use pathfinder_geometry::basic::vector::Vector2I;
|
|
use pathfinder_geometry::basic::rect::RectF;
|
|
use std::ops::Range;
|
|
use std::sync::atomic::{AtomicUsize, Ordering as AtomicOrdering};
|
|
|
|
pub struct ZBuffer {
|
|
buffer: DenseTileMap<AtomicUsize>,
|
|
}
|
|
|
|
impl ZBuffer {
|
|
pub fn new(view_box: RectF) -> ZBuffer {
|
|
let tile_rect = tiles::round_rect_out_to_tile_bounds(view_box);
|
|
ZBuffer {
|
|
buffer: DenseTileMap::from_builder(|_| AtomicUsize::new(0), tile_rect),
|
|
}
|
|
}
|
|
|
|
pub fn test(&self, coords: Vector2I, object_index: u32) -> bool {
|
|
let tile_index = self.buffer.coords_to_index_unchecked(coords);
|
|
let existing_depth = self.buffer.data[tile_index as usize].load(AtomicOrdering::SeqCst);
|
|
existing_depth < object_index as usize + 1
|
|
}
|
|
|
|
pub fn update(&self, coords: Vector2I, object_index: u16) {
|
|
let tile_index = self.buffer.coords_to_index_unchecked(coords);
|
|
let mut old_depth = self.buffer.data[tile_index].load(AtomicOrdering::SeqCst);
|
|
let new_depth = (object_index + 1) as usize;
|
|
while old_depth < new_depth {
|
|
let prev_depth = self.buffer.data[tile_index].compare_and_swap(
|
|
old_depth,
|
|
new_depth,
|
|
AtomicOrdering::SeqCst,
|
|
);
|
|
if prev_depth == old_depth {
|
|
// Successfully written.
|
|
return;
|
|
}
|
|
old_depth = prev_depth;
|
|
}
|
|
}
|
|
|
|
pub fn build_solid_tiles(&self, paths: &[PathObject], object_range: Range<u32>)
|
|
-> Vec<SolidTileBatchPrimitive> {
|
|
let mut solid_tiles = vec![];
|
|
for tile_index in 0..self.buffer.data.len() {
|
|
let depth = self.buffer.data[tile_index].load(AtomicOrdering::Relaxed);
|
|
if depth == 0 {
|
|
continue;
|
|
}
|
|
|
|
let tile_coords = self.buffer.index_to_coords(tile_index);
|
|
let object_index = (depth - 1) as u32;
|
|
if object_index < object_range.start || object_index >= object_range.end {
|
|
continue;
|
|
}
|
|
|
|
let origin_uv = paint::paint_id_to_tex_coords(paths[object_index as usize].paint());
|
|
|
|
solid_tiles.push(SolidTileBatchPrimitive::new(tile_coords + self.buffer.rect.origin(),
|
|
object_index as u16,
|
|
origin_uv));
|
|
}
|
|
|
|
solid_tiles
|
|
}
|
|
}
|
|
|
|
impl SolidTileBatchPrimitive {
|
|
fn new(tile_coords: Vector2I, object_index: u16, origin_uv: Vector2I)
|
|
-> SolidTileBatchPrimitive {
|
|
SolidTileBatchPrimitive {
|
|
tile_x: tile_coords.x() as i16,
|
|
tile_y: tile_coords.y() as i16,
|
|
object_index: object_index,
|
|
origin_u: origin_uv.x() as u16,
|
|
origin_v: origin_uv.y() as u16,
|
|
pad: 0,
|
|
}
|
|
}
|
|
}
|