294 lines
9.0 KiB
Rust
294 lines
9.0 KiB
Rust
// pathfinder/renderer/src/gpu_data.rs
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//
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// Copyright © 2019 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Packed data ready to be sent to the GPU.
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use crate::paint::{ObjectShader, ShaderId};
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use crate::tiles::{self, TILE_HEIGHT, TILE_WIDTH};
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use euclid::Rect;
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use fixedbitset::FixedBitSet;
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use pathfinder_geometry::line_segment::{LineSegmentF32, LineSegmentU4, LineSegmentU8};
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use pathfinder_geometry::point::Point2DF32;
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use pathfinder_geometry::simd::{F32x4, I32x4};
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use pathfinder_geometry::util;
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#[derive(Debug)]
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pub struct BuiltObject {
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pub bounds: Rect<f32>,
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pub tile_rect: Rect<i16>,
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pub tiles: Vec<TileObjectPrimitive>,
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pub fills: Vec<FillObjectPrimitive>,
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pub solid_tiles: FixedBitSet,
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pub shader: ShaderId,
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}
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#[derive(Debug)]
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pub struct BuiltScene {
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pub view_box: Rect<f32>,
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pub batches: Vec<Batch>,
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pub solid_tiles: Vec<SolidTileScenePrimitive>,
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pub shaders: Vec<ObjectShader>,
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}
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#[derive(Debug)]
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pub struct Batch {
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pub fills: Vec<FillBatchPrimitive>,
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pub mask_tiles: Vec<MaskTileBatchPrimitive>,
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}
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#[derive(Clone, Copy, Debug)]
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pub struct FillObjectPrimitive {
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pub px: LineSegmentU4,
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pub subpx: LineSegmentU8,
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pub tile_x: i16,
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pub tile_y: i16,
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}
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#[derive(Clone, Copy, Debug)]
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#[repr(C)]
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pub struct TileObjectPrimitive {
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pub tile_x: i16,
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pub tile_y: i16,
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pub backdrop: i16,
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}
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// FIXME(pcwalton): Move `subpx` before `px` and remove `repr(packed)`.
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#[derive(Clone, Copy, Debug)]
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#[repr(packed)]
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pub struct FillBatchPrimitive {
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pub px: LineSegmentU4,
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pub subpx: LineSegmentU8,
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pub mask_tile_index: u16,
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}
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#[derive(Clone, Copy, Debug)]
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#[repr(C)]
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pub struct SolidTileScenePrimitive {
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pub tile_x: i16,
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pub tile_y: i16,
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pub shader: ShaderId,
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}
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#[derive(Clone, Copy, Debug)]
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#[repr(C)]
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pub struct MaskTileBatchPrimitive {
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pub tile: TileObjectPrimitive,
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pub shader: ShaderId,
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}
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// Utilities for built objects
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impl BuiltObject {
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pub fn new(bounds: &Rect<f32>, shader: ShaderId) -> BuiltObject {
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// Compute the tile rect.
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let tile_rect = tiles::round_rect_out_to_tile_bounds(&bounds);
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// Allocate tiles.
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let tile_count = tile_rect.size.width as usize * tile_rect.size.height as usize;
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let mut tiles = Vec::with_capacity(tile_count);
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for y in tile_rect.origin.y..tile_rect.max_y() {
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for x in tile_rect.origin.x..tile_rect.max_x() {
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tiles.push(TileObjectPrimitive::new(x, y));
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}
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}
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let mut solid_tiles = FixedBitSet::with_capacity(tile_count);
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solid_tiles.insert_range(..);
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BuiltObject {
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bounds: *bounds,
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tile_rect,
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tiles,
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fills: vec![],
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solid_tiles,
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shader,
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}
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}
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// TODO(pcwalton): SIMD-ify `tile_x` and `tile_y`.
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fn add_fill(&mut self, segment: &LineSegmentF32, tile_x: i16, tile_y: i16) {
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//println!("add_fill({:?} ({}, {}))", segment, tile_x, tile_y);
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let mut segment = (segment.0 * F32x4::splat(256.0)).to_i32x4();
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let tile_origin_x = (TILE_WIDTH as i32) * 256 * (tile_x as i32);
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let tile_origin_y = (TILE_HEIGHT as i32) * 256 * (tile_y as i32);
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let tile_origin = I32x4::new(tile_origin_x, tile_origin_y, tile_origin_x, tile_origin_y);
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segment = segment - tile_origin;
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/*
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println!("... before min: {} {} {} {}",
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segment[0], segment[1], segment[2], segment[3]);
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*/
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//segment = Sse41::max_epi32(segment, Sse41::setzero_epi32());
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segment = segment.min(I32x4::splat(0x0fff));
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//println!("... after min: {} {} {} {}", segment[0], segment[1], segment[2], segment[3]);
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let shuffle_mask = I32x4::new(0x0c08_0400, 0x0d05_0901, 0, 0);
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segment = segment
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.as_u8x16()
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.shuffle(shuffle_mask.as_u8x16())
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.as_i32x4();
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// Unpack whole and fractional pixels.
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let px = LineSegmentU4((segment[1] | (segment[1] >> 12)) as u16);
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let subpx = LineSegmentU8(segment[0] as u32);
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// Cull degenerate fills.
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if (px.0 & 0xf) as u8 == ((px.0 >> 8) & 0xf) as u8 &&
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(subpx.0 & 0xff) as u8 == ((subpx.0 >> 16) & 0xff) as u8 {
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//println!("... ... culling!");
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return;
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}
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let tile_index = self.tile_coords_to_index(tile_x, tile_y);
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//println!("... ... OK, pushing");
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self.fills.push(FillObjectPrimitive {
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px,
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subpx,
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tile_x,
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tile_y,
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});
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self.solid_tiles.set(tile_index as usize, false);
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}
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pub fn add_active_fill(
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&mut self,
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left: f32,
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right: f32,
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mut winding: i16,
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tile_x: i16,
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tile_y: i16,
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) {
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let tile_origin_y = (i32::from(tile_y) * TILE_HEIGHT as i32) as f32;
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let left = Point2DF32::new(left, tile_origin_y);
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let right = Point2DF32::new(right, tile_origin_y);
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let segment = if winding < 0 {
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LineSegmentF32::new(&left, &right)
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} else {
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LineSegmentF32::new(&right, &left)
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};
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/*println!("... emitting active fill {} -> {} winding {} @ tile {},{}",
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left.x(),
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right.x(),
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winding,
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tile_x,
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tile_y);*/
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while winding != 0 {
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self.add_fill(&segment, tile_x, tile_y);
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if winding < 0 {
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winding += 1
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} else {
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winding -= 1
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}
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}
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}
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// TODO(pcwalton): Optimize this better with SIMD!
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pub fn generate_fill_primitives_for_line(&mut self, mut segment: LineSegmentF32, tile_y: i16) {
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/*println!("... generate_fill_primitives_for_line(): segment={:?} tile_y={} ({}-{})",
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segment,
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tile_y,
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tile_y as f32 * TILE_HEIGHT as f32,
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(tile_y + 1) as f32 * TILE_HEIGHT as f32);*/
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let winding = segment.from_x() > segment.to_x();
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let (segment_left, segment_right) = if !winding {
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(segment.from_x(), segment.to_x())
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} else {
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(segment.to_x(), segment.from_x())
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};
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let segment_tile_left = (f32::floor(segment_left) as i32 / TILE_WIDTH as i32) as i16;
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let segment_tile_right =
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util::alignup_i32(f32::ceil(segment_right) as i32, TILE_WIDTH as i32) as i16;
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/*println!("segment_tile_left={} segment_tile_right={} tile_rect={:?}",
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segment_tile_left, segment_tile_right, self.tile_rect);*/
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for subsegment_tile_x in segment_tile_left..segment_tile_right {
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let (mut fill_from, mut fill_to) = (segment.from(), segment.to());
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let subsegment_tile_right =
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((i32::from(subsegment_tile_x) + 1) * TILE_HEIGHT as i32) as f32;
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if subsegment_tile_right < segment_right {
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let x = subsegment_tile_right;
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let point = Point2DF32::new(x, segment.solve_y_for_x(x));
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if !winding {
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fill_to = point;
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segment = LineSegmentF32::new(&point, &segment.to());
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} else {
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fill_from = point;
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segment = LineSegmentF32::new(&segment.from(), &point);
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}
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}
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let fill_segment = LineSegmentF32::new(&fill_from, &fill_to);
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self.add_fill(&fill_segment, subsegment_tile_x, tile_y);
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}
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}
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// FIXME(pcwalton): Use a `Point2D<i16>` instead?
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pub fn tile_coords_to_index(&self, tile_x: i16, tile_y: i16) -> u32 {
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/*println!("tile_coords_to_index(x={}, y={}, tile_rect={:?})",
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tile_x,
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tile_y,
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self.tile_rect);*/
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(tile_y - self.tile_rect.origin.y) as u32 * self.tile_rect.size.width as u32
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+ (tile_x - self.tile_rect.origin.x) as u32
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}
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pub fn get_tile_mut(&mut self, tile_x: i16, tile_y: i16) -> &mut TileObjectPrimitive {
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let tile_index = self.tile_coords_to_index(tile_x, tile_y);
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&mut self.tiles[tile_index as usize]
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}
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}
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impl BuiltScene {
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#[inline]
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pub fn new(view_box: &Rect<f32>) -> BuiltScene {
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BuiltScene {
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view_box: *view_box,
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batches: vec![],
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solid_tiles: vec![],
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shaders: vec![],
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}
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}
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}
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impl Batch {
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#[inline]
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pub fn new() -> Batch {
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Batch {
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fills: vec![],
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mask_tiles: vec![],
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}
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}
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#[inline]
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pub fn is_empty(&self) -> bool {
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self.mask_tiles.is_empty()
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}
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}
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impl TileObjectPrimitive {
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#[inline]
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fn new(tile_x: i16, tile_y: i16) -> TileObjectPrimitive {
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TileObjectPrimitive {
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tile_x,
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tile_y,
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backdrop: 0,
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}
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}
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}
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